Research activity information

• Nov. 2012 ACM, Gordon Bell Prize

  ISHIYAMA Tomoaki, NITADORI Keigo, MAKINO Junichiro


• 2003 IEEE Gordon Bell 賞（福重俊幸、小久保英一郎、台坂博と共同受賞）


• 2002 第14回中小企業新技術・新製品賞(技術・製品部門、浜松メトリクス(株)と共同受賞)


• 2002 情報処理学会論文賞(朴泰祐、須佐元、梅村雅之、福重俊幸、宇川彰と共同受賞)


• 2001 IEEE Gordon Bell 賞（福重俊幸と共同受賞）


• 2000 IEEE Gordon Bell 賞（福重俊幸、古賀正基と共同受賞）


• 1999 ゴードン・ベル賞(Gordon Bell Prize)


• 1998 日本天文学会 林忠四郎賞


• 1996 ゴードン・ベル賞(Gordon Bell Prize)


• 1995 ゴードン・ベル賞(Gordon Bell Prize)

• Self-consistent N-body simulation of planetesimal-driven migration. I. The trajectories of single planets in the uniform background

  Tenri Jinno, Takayuki R Saitoh, Yoko Funato, Junichiro Makino

  Abstract Recent exoplanet observations have revealed a diversity of exoplanetary systems, which suggests the ubiquity of radial planetary migration. One powerful known mechanism of planetary migration is planetesimal-driven migration (PDM), which can let planets undergo significant migration through gravitational scattering with planetesimals. In this series of papers, we present the results of our high-resolution, self-consistent N-body simulations of PDM, in which gravitational interactions among planetesimals, the gas drag, and Type I migration are all taken into account. In this first paper (Paper I), we investigate the migration of a single planet through PDM within the framework of the classical standard disk model (the minimum-mass solar nebula model). Paper I aims to improve our understanding of planetary migration through PDM, addressing previously unexplored aspects of both the gravitational interactions among planetesimals and the interactions with disk gas. Our results show that even small protoplanets can actively migrate through PDM. Such active migration can act as a rapid radial diffusion mechanism for protoplanets and significantly influence the early stages of planetary formation (i.e., during the runaway growth phase). Moreover, a fair fraction of planets migrate outward. This outward migration may offer a potential solution for the “planet migration problem” caused by Type I migration and gives a natural mechanism for outward migration assumed in many recent scenarios for the formation of outer planets.

  Oxford University Press (OUP), Nov. 2024, Publications of the Astronomical Society of Japan

  [Refereed]

  Scientific journal


• An Independent Hybrid Imaging of Sgr A* from the Data in EHT 2017 Observations

  Makoto Miyoshi, Yoshiaki Kato, Junichiro Makino

  Abstract We propose that the ring structure found by the Event Horizon Telescope Collaboration (EHTC) as the black hole shadow of Sgr A* is an artifact by the bumpy PSF (Point Spread Function) of the EHT2017. The imaging using sparse u-v data requires detailed scrutiny of the PSF. The estimated shadow diameter ($\mathrm{48.7\pm 7~\mu \rm as}$) is equal to the spacing between the main beam and the first sidelobe of the PSF ($\mathrm{49.09~\mu \rm as}$), which immediately suggests a potential problem in the deconvolution of the PSF. We show that the ring image can be derived from non-ring simulated datasets (noise only; point source) with a narrow Field-of-View (FOV) and an assumed self-calibration suggesting the EHT2017’s u-v coverage is insufficient for reliable imaging. The EHTC analysis, based on calibrations with assumptions about the source’s size and properties, selected the final image by prioritizing appearance rate of the similar structure from a large imaging parameter space over data consistency. Our independent analysis with the conventional hybrid mapping reveals an elongated east-west structure, consistent with previous observations. We believe it to be more reliable than the EHTC image, due to half the residuals in normalized visibility amplitude. The eastern half is brighter, possibly due to a Doppler boost from the rapid rotating disk. We hypothesize our image shows a portion of the accretion disk about 2 to a few RS away from the black hole, rotating with nearly $\mathrm{60~\%}$ of the speed of light viewed from an angle of 40 − 45○.

  Oxford University Press (OUP), May 2024, Monthly Notices of the Royal Astronomical Society

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Fast and accurate short read alignment with hybrid hash-tree data structure

  Junichiro Makino, Toshikazu Ebisuzaki, Ryutaro Himeno, Yoshihide Hayashizaki

  Feb. 2024


• The Jet and Resolved Features of the Central Supermassive Black Hole of M87 Observed with EHT in 2017—Comparison with the GMVA 86 GHz Results

  Makoto Miyoshi, Yoshiaki Kato, Junichiro Makino, Masato Tsuboi

  Abstract M87 is the best target for studying black hole accretion and jet formation. Reanalysis of the Event Horizon Telescope (EHT) public data at 230 GHz shows a core–knots structure at the center and jet features. We here compare this with the new results of GMVA at 86 GHz showing a spatially resolved central core. There are similarities and differences between the two. At 86 GHz, “two bright regions” are seen on the ring in the core. The “core–knot–west knot” triple structure in the 230 GHz image shows apparent appearance of two peaks similar to the “two bright regions” when convolved with the GMVA beam. This similarity suggests that both frequencies reveal the same objects in the core area. Protrusions are observed on both the south and north sides of the core at both frequencies, becoming prominent and winglike at 230 GHz. The 86 GHz image shows a triple ridge jet structure, while the 230 GHz image shows only a bright central ridge with two roots. Both frequencies show a shade between the core and the central ridge. To detect the faint features from the EHT2017 data, we found that the use of all baseline data is essential. Using all baseline data, including the ultrashort data, revealed the jet and faint structures. Without the ultrashort baselines, these structures were not detectable. The lack of detection of any faint structures other than the ring in the M87 data by the EHTC is presumably due to the exclusion of ultrashort baselines from their analysis.

  American Astronomical Society, Feb. 2024, The Astrophysical Journal Letters, 963(1) (1), L18 - L18

  Scientific journal


• Surrogate Modeling for Computationally Expensive Simulations of Supernovae in High-Resolution Galaxy Simulations

  Keiya Hirashima, Kana Moriwaki, Michiko S Fujii, Yutaka Hirai, Takayuki R Saitoh, Junichiro Makino

  Nov. 2023, NeurIPS 2023 AI4Science Workshop, English

  [Refereed]

  International conference proceedings


• N-body simulation of planetary formation through pebble accretion in a radially structured protoplanetary disk

  Tenri Jinno, Takayuki R Saitoh, Yota Ishigaki, Junichiro Makino

  Abstract In the conventional theory of planet formation, it is assumed that protoplanetary disks are axisymmetric and have a smooth radial profile. However, recent radio observations of protoplanetary disks have revealed that many of them have complex radial structures. In this study, we perform a series of N-body simulations to investigate how planets are formed in protoplanetary disks with radial structures. For this purpose, we consider the effect of continuous pebble accretion onto the discontinuity boundary within the terrestrial planet-forming region (∼0.6 au). We find that protoplanets grow efficiently at the discontinuity boundary, reaching the Earth mass within ∼104 yr. We confirm that giant collisions of protoplanets occur universally in our model. Moreover, we find that multiple planet-sized bodies form at regular intervals in the vicinity of the discontinuity boundary. These results indicate the possibility of the formation of solar system-like planetary systems in radially structured protoplanetary disks.

  Oxford University Press (OUP), Sep. 2023, Publications of the Astronomical Society of Japan, 75(5) (5), 951 - 969

  Scientific journal


• 3D-Spatiotemporal Forecasting the Expansion of Supernova Shells Using Deep Learning toward High-Resolution Galaxy Simulations

  Keiya Hirashima, Kana Moriwaki, Michiko S. Fujii, Yutaka Hirai, Takayuki R. Saitoh, Junichiro Makino

  Jan. 2023, Monthly Notices of the Royal Astronomical Society, English

  Scientific journal


• Origin of highly r-process-enhanced stars in a cosmological zoom-in simulation of a Milky Way-like galaxy

  Yutaka Hirai, Timothy C Beers, Masashi Chiba, Wako Aoki, Derek Shank, Takayuki R Saitoh, Takashi Okamoto, Junichiro Makino

  Nov. 2022, Monthly Notices of the Royal Astronomical Society

  [Refereed]

  Scientific journal


• The Jet and Resolved Features of the Central Supermassive Black Hole of M87 Observed with the Event Horizon Telescope (EHT)

  Makoto Miyoshi, Yoshiaki Kato, Junichiro Makino

  Jul. 2022, The Astrophysical Journal

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Predicting the Expansion of Supernova Shells for High-Resolution Galaxy Simulations Using Deep Learning

  K. Hirashima, K. Moriwaki, M. S. Fujii, Y. Hirai, T. Saitoh, J. Makino

  Abstract Small integration timesteps for a small fraction of the particles become a bottleneck for future galaxy simulations with a higher resolution, especially for massively parallel computing. As we increase the resolution, we must resolve physics on a smaller timescale while the total integration time is fixed as the universe age. The small timesteps for a small fraction of the particles worsen the scalability. More specifically, the regions affected by supernovae (SN) have the smallest timestep in the whole galaxy. Using a Hamiltonian splitting method, we calculate the SN regions with small timesteps using a few thousand CPU cores but integrate the entire galaxy using a shared timestep. For this approach, we need to pick up particles in regions, which will be affected by SN (the target particles) by the next global step (the integration timestep for the entire galaxy) in advance. In this work, we developed the deep learning model to predict the region where the shell due to a supernova explosion expands during one global step. In addition, we identify the target particles using image processing of the density distribution predicted by our deep learning model. Our algorithm could identify the target particles better than the method based on the analytical solution. This particle selection method using deep learning and the Hamiltonian splitting method will improve the performance of galaxy simulations with extremely high resolution.

  IOP Publishing, Mar. 2022, Journal of Physics: Conference Series, 2207(1) (1), 012050 - 012050

  Scientific journal


• Particle–particle particle–tree code for planetary system formation with individual cut-off method: GPLUM

  Yota Ishigaki, Junko Kominami, Junichiro Makino, Masaki Fujimoto, Masaki Iwasawa

  Abstract In a standard theory of the formation of the planets in our Solar System, terrestrial planets and cores of gas giants are formed through accretion of kilometer-sized objects (planetesimals) in a protoplanetary disk. Gravitational N-body simulations of a disk system made up of numerous planetesimals are the most direct way to study the accretion process. However, the use of N-body simulations has been limited to idealized models (e.g., perfect accretion) and/or narrow spatial ranges in the radial direction, due to the limited number of simulation runs and particles available. We have developed new N-body simulation code equipped with a particle–particle particle–tree (P3T) scheme for studying the planetary system formation process: GPLUM. For each particle, GPLUM uses the fourth-order Hermite scheme to calculate gravitational interactions with particles within cut-off radii and the Barnes–Hut tree scheme for particles outside the cut-off radii. In existing implementations, P3T schemes use the same cut-off radius for all particles, making a simulation become slower when the mass range of the planetesimal population becomes wider. We have solved this problem by allowing each particle to have an appropriate cut-off radius depending on its mass, its distance from the central star, and the local velocity dispersion of planetesimals. In addition to achieving a significant speed-up, we have also improved the scalability of the code to reach a good strong-scaling performance up to 1024 cores in the case of N = 106.

  Oxford University Press ({OUP}), Jun. 2021, Publications of the Astronomical Society of Japan, 73(3) (3), 660 - 676, English

  Scientific journal


• petar: a high-performance N-body code for modelling massive collisional stellar systems

  Long Wang, Masaki Iwasawa, Keigo Nitadori, Junichiro Makino

  ABSTRACT The numerical simulations of massive collisional stellar systems, such as globular clusters (GCs), are very time consuming. Until now, only a few realistic million-body simulations of GCs with a small fraction of binaries ($5{ { \ \rm per\ cent } }$) have been performed by using the nbody6++gpu code. Such models took half a year computational time on a Graphic Processing Unit (GPU)-based supercomputer. In this work, we develop a new N-body code, petar, by combining the methods of Barnes–Hut tree, Hermite integrator and slow-down algorithmic regularization. The code can accurately handle an arbitrary fraction of multiple systems (e.g. binaries and triples) while keeping a high performance by using the hybrid parallelization methods with mpi, openmp, simd instructions and GPU. A few benchmarks indicate that petar and nbody6++gpu have a very good agreement on the long-term evolution of the global structure, binary orbits and escapers. On a highly configured GPU desktop computer, the performance of a million-body simulation with all stars in binaries by using petar is 11 times faster than that of nbody6++gpu. Moreover, on the Cray XC50 supercomputer, petar well scales when number of cores increase. The 10 million-body problem, which covers the region of ultracompact dwarfs and nuclear star clusters, becomes possible to be solved.

  Oxford University Press ({OUP}), Sep. 2020, Monthly Notices of the Royal Astronomical Society, 497(1) (1), 536 - 555, English

  Scientific journal


• Predicting the Expansion of Supernova Shells Using Deep Learning toward Highly Resolved Galaxy Simulations

  Keiya Hirashima, Kana Moriwaki, Michiko Fujii, Yutaka Hirai, Takayuki Saitoh, Junichiro Makino

  Abstract The load imbalance and communication overhead of parallel computing are crucial bottlenecks for galaxy simulations. A successful way to improve the scalability of astronomical simulations is a Hamiltonian splitting method, which needs to identify such regions integrated with smaller timesteps than the global timestep for integrating the entire galaxy. In the case of galaxy simulations, the regions inside supernova (SN) shells require the smallest steps. We developed the deep learning model to forecast the region affected by the SN shell’s expansion during one global step. In addition, we identified the particles with small timesteps using image processing. We can identify target particles using our method with a higher identification rate (88 % to 98 % on average) and lower “non-target”-to-“target” fraction (6.4 to 5.5 on average) compared to the analytic approach with the Sedov-Taylor solution. Our method using Hamiltonian splitting and deep learning will improve the performance of extremely high-resolution galaxy simulations.

  Cambridge University Press (CUP), Jun. 2020, Proceedings of the International Astronomical Union, 16(S362) (S362), 209 - 214

  Scientific journal


• Are long-term N-body simulations reliable?

  Junichiro Makino

  ABSTRACT N-body integrations are used to model a wide range of astrophysical dynamics, but they suffer from errors which make their orbits diverge exponentially in time from the correct orbits. Over long time-scales, their reliability needs to be established. We address this reliability by running a three-body planetary system over about 200 e-folding times. Using nearby initial conditions, we can construct statistics of the long-term phase-space structure and compare to rough estimates of resonant widths of the system. We compared statistics for a wide range of numerical methods, including a Runge–Kutta method, Wisdom–Holman method, symplectic corrector methods, and a method by Laskar and Robutel. ‘Improving’ an integrator did not increase the phase-space accuracy, but simply increasing the number of initial conditions did. In fact, the statistics of a higher order symplectic corrector method were inconsistent with the other methods in one test.

  Apr. 2020, Monthly Notices of the Royal Astronomical Society, English

  [Refereed]

  Scientific journal


• INO: Interplanetary network of optical lattice clocks

  Toshikazu Ebisuzaki, Hidetoshi Katori, Jun’ichiro Makino, Atsushi Noda, Hisaaki Shinkai, Toru Tamagawa

  The new technique of measuring frequency by optical lattice clocks now approaches to the relative precision of [Formula: see text]. We propose to place such precise clocks in space and to use Doppler tracking method for detecting low-frequency gravitational wave below 1[Formula: see text]Hz. Our idea is to locate three spacecrafts at one A.U. distance (say at L1, L4 and L5 of the Sun–Earth orbit), and apply the Doppler tracking method by communicating “the time” each other. Applying the current available technologies, we obtain the sensitivity for gravitational wave with third- or fourth-order improvement ([Formula: see text] or [Formula: see text] level in [Formula: see text]–[Formula: see text][Formula: see text]Hz) than that of Cassini spacecraft in 2001. This sensitivity enables us to observe black hole (BH) mergers of their mass greater than [Formula: see text] in the cosmological scale. Based on the hierarchical growth model of BHs in galaxies, we estimate the event rate of detection will be 20–50 a year. We nickname “INO” (Interplanetary Network of Optical Lattice Clocks) for this system, named after Tadataka Ino (1745–1818), a Japanese astronomer, cartographer, and geodesist.

  World Scientific Pub Co Pte Lt, Mar. 2020, International Journal of Modern Physics D, 29(04) (04), 1940002 - 1940002, English

  [Refereed]

  Scientific journal


• Extreme-scale particle-based simulations on advanced HPC platforms

  M. Iwasawa, D. Namekata, K. Nomura, M. Tsubouchi, J. Makino

  Springer Science and Business Media {LLC}, Feb. 2020, CCF Transactions on High Performance Computing, 2(2) (2), 183 - 195

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• A slow-down time-transformed symplectic integrator for solving the few-body problem

  Junichiro Makino

  Abstract An accurate and efficient method dealing with the few-body dynamics is important for simulating collisional N-body systems like star clusters and to follow the formation and evolution of compact binaries. We describe such a method which combines the time-transformed explicit symplectic integrator (Preto & Tremaine 1999; Mikkola & Tanikawa 1999) and the slow-down method (Mikkola & Aarseth 1996). The former conserves the Hamiltonian and the angular momentum for a long-term evolution, while the latter significantly reduces the computational cost for a weakly perturbed binary. In this work, the Hamilton equations of this algorithm are analyzed in detail. We mathematically and numerically show that it can correctly reproduce the secular evolution like the orbit averaged method and also well conserve the angular momentum. For a weakly perturbed binary, the method is possible to provide a few order of magnitude faster performance than the classical algorithm. A publicly available code written in the c++ language, sdar, is available on https://github.com/lwang- astro/SDARGitHub. It can be used either as a standalone tool or a library to be plugged in other N-body codes. The high precision of the floating point to 62 digits is also supported.

  Feb. 2020, Monthly Notices of the Royal Astronomical Society, English

  [Refereed]

  Scientific journal


• Accelerated FDPS: Algorithms to use accelerators with FDPS

  Junichiro Makino

  Abstract We describe algorithms implemented in FDPS (Framework for Developing Particle Simulators) to make efficient use of accelerator hardware such as GPGPUs (general-purpose computing on graphics processing units). We have developed FDPS to make it possible for researchers to develop their own high-performance parallel particle-based simulation programs without spending large amounts of time on parallelization and performance tuning. FDPS provides a high-performance implementation of parallel algorithms for particle-based simulations in a “generic” form, so that researchers can define their own particle data structure and interparticle interaction functions. FDPS compiled with user-supplied data types and interaction functions provides all the necessary functions for parallelization, and researchers can thus write their programs as though they are writing simple non-parallel code. It has previously been possible to use accelerators with FDPS by writing an interaction function that uses the accelerator. However, the efficiency was limited by the latency and bandwidth of communication between the CPU and the accelerator, and also by the mismatch between the available degree of parallelism of the interaction function and that of the hardware parallelism. We have modified the interface of the user-provided interaction functions so that accelerators are more efficiently used. We also implemented new techniques which reduce the amount of work on the CPU side and the amount of communication between CPU and accelerators. We have measured the performance of N-body simulations on a system with an NVIDIA Volta GPGPU using FDPS and the achieved performance is around 27% of the theoretical peak limit. We have constructed a detailed performance model, and found that the current implementation can achieve good performance on systems with much smaller memory and communication bandwidth. Thus, our implementation will be applicable to future generations of accelerator system.

  Feb. 2020, Publications of the Astronomical Society of Japan, English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Implementation and Performance of Barnes-Hut N-body algorithm on Extreme-scale Heterogeneous Many-core Architectures

  Masaki Iwasawa, Daisuke Namekata, Ryo Sakamoto, Takashi Nakamura, Yasuyuki Kimura, Keigo Nitadori, Long Wang, Miyuki Tsubouchi, Jun Makino, Zhao Liu, Haohuan Fu, Guangwen Yang

  Jul. 2019, INTERNATIONAL JOURNAL OF HIGH PERFORMANCE COMPUTING APPLICATIONS, 34(6) (6), 615 - 628, English

  [Refereed]

  Scientific journal


• INO: Interplanetary network of optical lattice clocks

  Junichiro Makino

  The new technique of measuring frequency by optical lattice clocks now approaches to the relative precision of [Formula: see text]. We propose to place such precise clocks in space and to use Doppler tracking method for detecting low-frequency gravitational wave below 1[Formula: see text]Hz. Our idea is to locate three spacecrafts at one A.U. distance (say at L1, L4 and L5 of the Sun–Earth orbit), and apply the Doppler tracking method by communicating “the time” each other. Applying the current available technologies, we obtain the sensitivity for gravitational wave with third- or fourth-order improvement ([Formula: see text] or [Formula: see text] level in [Formula: see text]–[Formula: see text][Formula: see text]Hz) than that of Cassini spacecraft in 2001. This sensitivity enables us to observe black hole (BH) mergers of their mass greater than [Formula: see text] in the cosmological scale. Based on the hierarchical growth model of BHs in galaxies, we estimate the event rate of detection will be 20–50 a year. We nickname “INO” (Interplanetary Network of Optical Lattice Clocks) for this system, named after Tadataka Ino (1745–1818), a Japanese astronomer, cartographer, and geodesist.

  Feb. 2019, International Journal of Modern Physics D, English

  [Refereed]

  Scientific journal


• Hermite integrator for high-order mesh-free schemes

  Yamamoto, Satoko, Makino, Junichiro

  2019, Publications of the Astronomical Society of Japan, English

  [Refereed]

  Scientific journal


• Terrestrial magma ocean origin of the Moon

  Hosono, Natsuki, Karato, Shun-ichiro, Makino, Junichiro, Saitoh, Takayuki R.

  2019, Nature Geoscience, 12(6) (6), 418, English

  [Refereed]

  Scientific journal


• Real-time simulation of a cat-scale artificial cerebellum on PEZY-SC processors

  Yamazaki, Tadashi, Igarashi, Jun, Makino, Junichiro, Ebisuzaki, Toshikazu

  2019, International Journal of High Performance Computing Applications, English

  [Refereed]

  Scientific journal


• Global simulation of planetary rings on sunway TaihuLight

  Masaki Iwasawa, Long Wang, Keigo Nitadori, Daisuke Namekata, Takayuki Muranushi, Miyuki Tsubouchi, Junichiro Makino, Zhao Liu, Haohuan Fu, Guangwen Yang

  Springer Verlag, 2018, Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics), 10860, 483 - 495, English

  [Refereed]

  International conference proceedings


• Automatic Generation of High-Order Finite-Difference Code with Temporal Blocking For Extreme-Scale Many-Core Systems

  Tanaka, Hideyuki, Ishihara, Youhei, Sakamoto, Ryo, Nakamura, Takashi, Kimura, Yasuyuki, Nitadori, Keigo, Tsubouchi, Miyuki, Makino, Jun

  2018, PROCEEDINGS OF IEEE/ACM 4TH INTERNATIONAL WORKSHOP ON EXTREME SCALE PROGRAMMING MODELS AND MIDDLEWARE (ESPM2)

  [Refereed]

  Scientific journal


• Fortran interface layer of the framework for developing particle simulator FDPS

  Namekata, Daisuke, Iwasawa, Masaki, Nitadori, Keigo, Tanikawa, Ataru, Muranushi, Takayuki, Wang, Long, Hosono, Natsuki, Nomura, Kentaro, Makino, Junichiro

  2018, Publications of the Astronomical Society of Japan, 70(4) (4), 70, English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Variable inertia method: A novel numerical method for mantle convection simulation

  Kosuke Takeyama, Takayuki R. Saitoh, Junichiro Makino

  2017, New Astronomy, 50, 82 - 103, English

  [Refereed]

  Scientific journal


• Unconvergence of very-large-scale giant impact simulations

  Hosono, Natsuki, Iwasawa, Masaki, Tanikawa, Ataru, Nitadori, Keigo, Muranushi, Takayuki, Makino, Junichiro

  2017, Publications of the Astronomical Society of Japan, 69(2) (2), English

  [Refereed]

  Scientific journal


• 連載「FDPS入門(1)」

  牧野 淳一郎

  本稿では、私達が開発・公開している多体シミュレーションプログラム開発フレームワーク「FDPS (Framework for Developping Particle Simulators)」を紹介します。FDPS は、粒子シミュレーションを研究に使っている多くの研究者が、並列化や計算機アーキテクチャ固有のチューニングに多大な時間を費やすことなく、自分の扱いたい問題向けのシミュレーションプログラムを容易に作成できるようになることを目標として開発したフレームワークです。連載第一回の今回は、FDPS の開発の背景、考え方と、実際にどのようなことができるか、という簡単な例を紹介します。

  分子シミュレーション研究会, 2017, アンサンブル, 19(2) (2), 105 - 110, Japanese


• A formulation of consistent particle hydrodynamics in strong form

  Satoko Yamamoto, Junichiro Makino

  2017, Publications of the Astronomical Society of Japan, 69(2) (2), English

  [Refereed]

  Scientific journal


• The detection rates of merging binary black holes originating from star clusters and their mass function

  Fujii, Michiko S., Tanikawa, Ataru, Makino, Junichiro

  2017, Publications of the Astronomical Society of Japan, 69(6) (6)

  [Refereed]

  Scientific journal


• The implication of the detection of the gravitational wave and future research direction

  牧野 淳一郎

  岩波書店, May 2016, 科学, 86(5) (5), 456 - 460, Japanese


• Terrestrial magma ocean origin of the Moon: A numerical study of a giant impact incorporating the different equations of state for melts and solids

  Hosono N, Karato SI, Makino J

  2016, AGU Fall Meeting Abstracts


• Formation and Evolution of Massive Black Holes in Star Clusters

  Holger Baumgardt, Junichiro Makino, Simon Portegies Zwart

  2016, Highlights of Astronomy

  [Refereed]

  Scientific journal


• Implementation and evaluation of data-compression algorithms for irregular-grid iterative methods on the PEZY-SC processor

  Yoshifuji, Naoki, Sakamoto, Ryo, Nitadori, Keigo, Makino, Jun

  2016, PROCEEDINGS OF 6TH WORKSHOP ON IRREGULAR APPLICATIONS: ARCHITECTURE AND ALGORITHMS (IA3)

  [Refereed]

  Scientific journal


• GLOBAL HIGH-RESOLUTION N -BODY SIMULATION OF PLANET FORMATION. I. PLANETESIMAL-DRIVEN MIGRATION

  J. D. Kominami, H. Daisaka, J. Makino, M. Fujimoto

  2016, The Astrophysical Journal, 819(1) (1)

  [Refereed]

  Scientific journal


• Automatic Generation of Efficient Codes from Mathematical Descriptions of Stencil Computation

  Muranushi, Takayuki, Nishizawa, Seiya, Tomita, Hirofumi, Nitadori, Keigo, Iwasawa, Masaki, Maruyama, Yutaka, Yashiro, Hisashi, Nakamura, Yoshifumi, Hotta, Hideyuki, Makino, Junichiro, Hosono, Natsuki, Inoue, Hikaru

  2016, FHPC'16: PROCEEDINGS OF THE 5TH INTERNATIONAL WORKSHOP ON FUNCTIONAL HIGH-PERFORMANCE COMPUTING, 17 - 22

  [Refereed]

  Scientific journal


• Simulations of Below-Ground Dynamics of Fungi: 1.184 Pflops Attained by Automated Generation and Autotuning of Temporal Blocking Codes

  Muranushi, Takayuki, Hotta, Hideyuki, Makino, Junichiro, Nishizawa, Seiya, Tomita, Hirofumi, Nitadori, Keigo, Iwasawa, Masaki, Hosono, Natsuki, Maruyama, Yutaka, Inoue, Hikaru, Yashiro, Hisashi, Nakamura, Yoshifumi

  2016, Sc '16: Proceedings of the International Conference For High Performance Computing, Networking, Storage and Analysis, 23 - 33

  [Refereed]

  Scientific journal


• Santa Barbara Cluster Comparison Test with DISPH

  Saitoh, T. R, Makino, J

  2016, The Astrophysical Journal, English

  [Refereed]

  Scientific journal


• A COMPARISON OF SPH ARTIFICIAL VISCOSITIES AND THEIR IMPACT ON THE KEPLERIAN DISK

  Natsuki Hosono, Takayuki R. Saitoh, Junichiro Makino

  2016, The Astrophysical Journal Supplement Series, 224(2) (2)

  [Refereed]

  Scientific journal


• The giant impact simulations with density independent smoothed particle hydrodynamics

  Natsuki Hosono, Takayuki R. Saitoh, Junichiro Makino, Hidenori Genda, Shigeru Ida

  2016, Icarus, 271, 131 - 157

  [Refereed]

  Scientific journal


• SANTA BARBARA CLUSTER COMPARISON TEST WITH DISPH

  Takayuki R. Saitoh, Junichiro Makino

  2016, The Astrophysical Journal, 823(2) (2)

  [Refereed]

  Scientific journal


• Implementation and performance of FDPS: a framework for developing parallel particle simulation codes

  Masaki Iwasawa, Ataru Tanikawa, Natsuki Hosono, Keigo Nitadori, Takayuki Muranushi, Junichiro Makino

  2016, Publications of the Astronomical Society of Japan, 68(4) (4)

  [Refereed]

  Scientific journal


• FDPS: A novel framework for developing high-performance particle simulation codes for distributed-memory systems

  Masaki Iwasawa, Ataru Tanikawa, Natsuki Hosono, Keigo Nitadori, Takayuki Muranushi, Junichiro Makino

  Association for Computing Machinery, Inc, Nov. 2015, Proceedings of WOLFHPC 2015: 5th International Workshop on Domain-Specific Languages and High-Level Frameworks for High Performance Computing - Held in conjunction with SC 2015: The International Conference for High Performance Computing, Networking, Storage and Analysis, 1, English

  [Refereed]

  International conference proceedings


• A development of an accelerator board dedicated for multi-precision arithmetic operations and its application to Feynman loop integrals

  Motoki, S., Daisaka, H., Nakasato, N., Ishikawa, T., Yuasa, F., Fukushige, T., Kawai, A., Makino, J.

  2015, Journal of Physics: Conference Series

  [Refereed]

  Scientific journal


• Optimal Temporal Blocking for Stencil Computation

  Muranushi, Takayuki, Muranushi, Takayuki, Makino, Junichiro, Makino, Junichiro

  2015, Procedia Computer Science, 51, 1303 - 1312

  [Refereed]

  Scientific journal


• Smoothed particle hydrodynamics with smoothed pseudo-density

  Satoko Yamamoto, Takayuki R. Saitoh, Junichiro Makino

  2015, Publications of the Astronomical Society of Japan, 67(3) (3)

  [Refereed]

  Scientific journal


• Nanoblock unroll: Towards the automatic generation of stencil codes with the optimal performance

  Takayuki Muranushi, Keigo Nitadori, Junichiro Makino

  Association for Computing Machinery, Inc, Oct. 2014, WOSC 2014 - Proceedings of the 2014 ACM SIGPLAN Workshop on Stencil Computations, Part of SPLASH 2014, 49 - 55, English

  [Refereed]

  International conference proceedings


• Binary formation in planetesimal disks. II. Planetesimals with a mass spectrum

  KominAmi, Junko D., Makino, Junichiro

  2014, Publications of the Astronomical Society of Japan, 66(6) (6), 123 - 1-13, English

  [Refereed]

  Scientific journal


• Flaring up of the compact cloud G2 during the close encounter with Sgr A*

  Takayuki R. Saitoh, Junichiro Makino, Yoshiharu Asaki, Junichi Baba, Shinya Komugi, Makoto Miyoshi, Tohru Nagao, Masaaki Takahashi, Takaaki Takeda, Masato Tsuboi, Ken-ichi Wakamatsu

  2014, Publications of the Astronomical Society of Japan, 66(1) (1), English

  [Refereed]

  Scientific journal


• Binary formation in planetesimal disks. II. Planetesimals with a mass spectrum

  Junko D. Kominami, Junichiro Makino

  2014, Publications of the Astronomical Society of Japan, 66(6) (6), English

  [Refereed]

  Scientific journal


• A Density-independent Formulation of Smoothed Particle Hydrodynamics

  Saitoh, T. R, Makino, J

  2013, The Astrophysical Journal, English

  [Refereed]

  Scientific journal


• THE COSMOGRID SIMULATION: STATISTICAL PROPERTIES OF SMALL DARK MATTER HALOS

  Tomoaki Ishiyama, Steven Rieder, Junichiro Makino, Simon Portegies Zwart, Derek Groen, Keigo Nitadori, Cees de Laat, Stephen McMillan, Kei Hiraki, Stefan Harfst

  2013, The Astrophysical Journal, 767(2) (2)

  [Refereed]

  Scientific journal


• A DENSITY-INDEPENDENT FORMULATION OF SMOOTHED PARTICLE HYDRODYNAMICS

  Takayuki R. Saitoh, Junichiro Makino

  2013, The Astrophysical Journal, 768(1) (1)

  [Refereed]

  Scientific journal


• Density-Independent Smoothed Particle Hydrodynamics for a Non-Ideal Equation of State

  Hosono, Natsuki, Saitoh, Takayuki R., Makino, Junichiro

  2013, Publications of the Astronomical Society of Japan, 65(5) (5)

  [Refereed]

  Scientific journal


• Few-body modes of binary formation in core collapse

  Tanikawa, Ataru, Heggie, Douglas C., Hut, Piet, Makino, Junichiro

  2013, Astronomy and Computing, 3-4, 35 - 49

  [Refereed]

  Scientific journal


• Evolution of star clusters in a cosmological tidal field

  Steven Rieder, Tomoaki Ishiyama, Paul Langelaan, Junichiro Makino, Stephen L. W. McMillan, Simon Portegies Zwart

  2013, Monthly Notices of the Royal Astronomical Society, 436(4) (4), 3695 - 3706

  [Refereed]

  Scientific journal


• GRAPE-MPs: Implementation of an SIMD for quadruple/hexuple/octuple- precision arithmetic operation on a structured asic and an FPGA

  Naohito Nakasato, Hiroshi Daisaka, Toshiyuki Fukushige, Atsushi Kawai, Junichiro Makino, Tadashi Ishikawa, Fukuko Yuasa

  2012, Proceedings - IEEE 6th International Symposium on Embedded Multicore SoCs, MCSoC 2012, 75 - 83, English

  International conference proceedings


• The dynamics of long-lived spiral arms

  Fujii, M. S., Baba, J., Saitoh, T. R., Kokubo, E., Makino, J., Wada, K.

  2012, EPJ Web of Conferences

  [Refereed]

  Scientific journal


• The Formation and Evolution of First Dark Matter Microhalos

  Ishiyama, Tomoaki, Makino, Junichiro, Ebisuzaki, Toshikazu

  2012, AIP Conference Proceedings, 1480, 382 - 384

  [Refereed]

  Scientific journal


• GRAPE-8-An Accelerator for Gravitational N-body Simulation with 20.5Gflops/W Performance

  Makino, Junichiro, Daisaka, Hiroshi

  2012, SC14: International Conference for High Performance Computing, Networking, Storage and Analysis

  [Refereed]

  Scientific journal


• Astrophysics with GRAPE

  Junichiro Makino, Takayuki Saitoh

  2012, Progress of Theoretical and Experimental Physics, (1) (1)

  [Refereed]

  Scientific journal


• 4.45 Pflops Astrophysical N-Body Simulation on K computer - The Gravitational Trillion-Body Problem

  Ishiyama, Tomoaki, Nitadori, Keigo, Makino, Junichiro

  2012, SC14: International Conference for High Performance Computing, Networking, Storage and Analysis

  [Refereed]

  Scientific journal


• A natural symmetrization for the plummer potential

  Takayuki R. Saitoh, Junichiro Makino

  2012, New Astronomy, 17(2) (2), 76 - 81

  [Refereed]

  Scientific journal


• ORIGIN OF MULTIPLE NUCLEI IN ULTRALUMINOUS INFRARED GALAXIES

  Hidenori Matsui, Takayuki R. Saitoh, Junichiro Makino, Keiichi Wada, Kohji Tomisaka, Eiichiro Kokubo, Hiroshi Daisaka, Takashi Okamoto, Naoki Yoshida

  2012, The Astrophysical Journal, 746(1) (1)

  [Refereed]

  Scientific journal


• Unexpected formation modes of the first hard binary in core collapse

  Ataru Tanikawa, Piet Hut, Junichiro Makino

  2012, New Astronomy, 17(3) (3), 272 - 280

  [Refereed]

  Scientific journal


• PSDF: Particle Stream Data Format for N-body simulations

  Will M. Farr, Jeff Ames, Piet Hut, Junichiro Makino, Steve McMillan, Takayuki Muranushi, Koichi Nakamura, Keigo Nitadori, Simon Portegies Zwart

  2012, New Astronomy, 17(5) (5), 520 - 523

  [Refereed]

  Scientific journal


• High-performance gravitational N-body simulations on a planet-wide- distributed supercomputer

  Derek Groen, Simon Portegies Zwart, Tomoaki Ishiyama, Jun Makino

  Dec. 2011, Computational Science and Discovery, 4(1) (1), English

  [Refereed]

  Scientific journal


• THE DYNAMICS OF SPIRAL ARMS IN PURE STELLAR DISKS

  M. S. Fujii, J. Baba, T. R. Saitoh, J. Makino, E. Kokubo, K. Wada

  2011, The Astrophysical Journal, 730(2) (2)

  [Refereed]

  Scientific journal


• The performance of GRAPE-DR for dense matrix operations

  Makino, Junichiro, Daisaka, Hiroshi, Fukushige, Toshiyuki, Sugawara, Yutaka, Inaba, Mary, Hiraki, Kei

  2011, Procedia Computer Science, 4, 888 - 897, English

  [Refereed]

  Scientific journal


• Shock-induced star cluster formation in colliding galaxies

  Saitoh, Takayuki R., Saitoh, Takayuki R., Daisaka, Hiroshi, Daisaka, Hiroshi, Kokubo, Eiichiro, Kokubo, Eiichiro, Makino, Junichiro, Makino, Junichiro, Okamoto, Takashi, Okamoto, Takashi, Tomisaka, Kohji, Tomisaka, Kohji, Wada, Keiichi, Wada, Keiichi, Yoshida, Naoki, Yoshida, Naoki

  2011, Proceedings of the International Astronomical Union, (270) (270), 483 - 486, English

  [Refereed]

  Scientific journal


• GRAPE-MP: An SIMD Accelerator Board for Multi-precision Arithmetic

  Daisaka, Hiroshi, Nakasato, Naohito, Makino, Junichiro, Yuasa, Fukuko, Ishikawa, Tadashi

  2011, Procedia Computer Science, 4, 878 - 887, English

  [Refereed]

  Scientific journal


• GRAPE Accelerators

  Junichiro Makino

  2011, Proceedings of the International Astronomical Union, (270) (270), 389 - 396, English

  [Refereed]

  Scientific journal


• ECCENTRIC EVOLUTION OF SUPERMASSIVE BLACK HOLE BINARIES

  Masaki Iwasawa, Sangyong An, Tatsushi Matsubayashi, Yoko Funato, Junichiro Makino

  2011, The Astrophysical Journal, 731(1) (1), English

  [Refereed]

  Scientific journal


• Particle–Particle Particle–Tree: A Direct-Tree Hybrid Scheme for Collisional N -Body Simulations

  Shoichi Oshino, Yoko Funato, Junichiro Makino

  2011, Publications of the Astronomical Society of Japan, 63(4) (4), 881 - 892, English

  [Refereed]

  Scientific journal


• Binary Formation in Planetesimal Disks. I. Equal Mass Planetesimals

  Junko D. Kominami, Junichiro Makino, Hiroshi Daisaka

  2011, Publications of the Astronomical Society of Japan, 63(6) (6), 1331 - 1344

  [Refereed]

  Scientific journal


• GAMMA-RAY SIGNAL FROM EARTH-MASS DARK MATTER MICROHALOS

  Tomoaki Ishiyama, Junichiro Makino, Toshikazu Ebisuzaki

  Nov. 2010, ASTROPHYSICAL JOURNAL LETTERS, 723(2) (2), L195 - L200, English

  [Refereed]

  Scientific journal


• THE ORIGIN OF S-STARS AND A YOUNG STELLAR DISK: DISTRIBUTION OF DEBRIS STARS OF A SINKING STAR CLUSTER

  M. Fujii, M. Iwasawa, Y. Funato, J. Makino

  Jun. 2010, ASTROPHYSICAL JOURNAL LETTERS, 716(1) (1), L80 - L84, English

  [Refereed]

  Scientific journal


• Triplets of supermassive black holes: astrophysics, gravitational waves and detection

  Pau Amaro-Seoane, Alberto Sesana, Loren Hoffman, Matthew Benacquista, Christoph Eichhorn, Junichiro Makino, Rainer Spurzem

  2010, Monthly Notices of the Royal Astronomical Society, 402(4) (4), 2308 - 2320

  [Refereed]

  Scientific journal


• THE ORIGIN OF S-STARS AND A YOUNG STELLAR DISK: DISTRIBUTION OF DEBRIS STARS OF A SINKING STAR CLUSTER

  M. Fujii, M. Iwasawa, Y. Funato, J. Makino

  2010, The Astrophysical Journal, 716(1) (1), 80 - 84

  [Refereed]

  Scientific journal


• Star Cluster Migration Near the Galactic Center

  Fujii, Michiko, Iwasawa, Masaki, Funato, Yoko, Makino, Junichiro

  2010, Proceedings of the International Astronomical Union, (267) (267), 329

  [Refereed]

  Scientific journal


• Shock-Induced Starburst and Star Cluster Formation in Colliding Galaxies

  Saitoh, Takayuki R., Daisaka, Hiroshi, Kokubo, Eiichiro, Makino, Junichiro, Okamoto, Takashi, Tomisaka, Kohji, Wada, Keiichi, Yoshida, Naoki

  2010, Galaxy Wars: Stellar Populations and Star Formation in Interacting Galaxies, 423, 185 - +

  [Refereed]

  Scientific journal


• GRAPE-DR: 2-Pflops massively-parallel computer with 512-core, 512-Gflops processor chips for scientific computing

  Makino, Junichiro, Hiraki, Kei, Inaba, Mary

  2010, ACM/IEEE SC07 CONFERENCE, 548 - +

  [Refereed]

  Scientific journal


• GAMMA-RAY SIGNAL FROM EARTH-MASS DARK MATTER MICROHALOS

  Tomoaki Ishiyama, Junichiro Makino, Toshikazu Ebisuzaki

  2010, The Astrophysical Journal, 723(2) (2), 195 - 200

  [Refereed]

  Scientific journal


• FAST: A Fully Asynchronous Split Time-Integrator for a Self-Gravitating Fluid

  Takayuki R. Saitoh, Junichiro Makino

  2010, Publications of the Astronomical Society of Japan, 62(2) (2), 301--314 - 314, English

  [Refereed]

  Scientific journal


• Simulating the Universe on an Intercontinental Grid

  Simon Portegies Zwart, Derek Groen, Tomoaki Ishiyama, Keigo Nitadori, Junichiro makino, Cees de Laat, Steve McMillan, Kei Hiraki, Stefan Harfst, Paola Grosso

  2010, Computer, 43(8) (8), 63 - 70

  [Refereed]

  Scientific journal


• A NECESSARY CONDITION FOR INDIVIDUAL TIME STEPS IN SPH SIMULATIONS

  Takayuki R. Saitoh, Junichiro Makino

  Jun. 2009, ASTROPHYSICAL JOURNAL LETTERS, 697(2) (2), L99 - L102, English

  [Refereed]

  Scientific journal


• アクセラレータによる四倍精度演算

  中里 直人, 石川 正, 牧野淳一郎, 湯浅富久子

  2009, 情報処理学会研究会, HPC-121, 39


• A Compiler for High Performance Computing With Many-Core Accelerators

  Nakasato, Naohito, Makino, Jun

  2009, IEEE International Conference on Cluster Computing and Workshops

  [Refereed]

  Scientific journal


• AstroSim: Collaborative Visualization of an Astrophysics Simulation in Second Life

  A. Nakasone, K. Miura, H. Prendinger, P. Hut, S. Holland, J. Makino

  2009, IEEE Computer Graphics and Applications, 29(5) (5)

  [Refereed]

  Scientific journal


• VARIATION OF THE SUBHALO ABUNDANCE IN DARK MATTER HALOS

  Tomoaki Ishiyama, Toshiyuki Fukushige, Junichiro Makino

  2009, The Astrophysical Journal, 696(2) (2), 2115 - 2125

  [Refereed]

  Scientific journal


• TROJAN STARS IN THE GALACTIC CENTER

  M. Fujii, M. Iwasawa, Y. Funato, J. Makino

  2009, The Astrophysical Journal, 695(2) (2)

  [Refereed]

  Scientific journal


• THE ORIGIN OF LARGE PECULIAR MOTIONS OF STAR-FORMING REGIONS AND SPIRAL STRUCTURES OF OUR GALAXY

  Junichi Baba, Yoshiharu Asaki, Junichiro Makino, Makoto Miyoshi, Takayuki R. Saitoh, Keiichi Wada

  2009, The Astrophysical Journal, 706(1) (1), 471 - 481

  [Refereed]

  Scientific journal


• A NECESSARY CONDITION FOR INDIVIDUAL TIME STEPS IN SPH SIMULATIONS

  Takayuki R. Saitoh, Junichiro Makino

  2009, The Astrophysical Journal, 697(2) (2), 99 - 102

  [Refereed]

  Scientific journal


• Toward First-Principle Simulations of Galaxy Formation: II. Shock-Induced Starburst at a Collision Interface during the First Encounter of Interacting Galaxies

  Takayuki R. Saitoh, Hiroshi Daisaka, Eiichiro Kokubo, Junichiro Makino, Takashi Okamoto, Kohji Tomisaka, Keiichi Wada, Naoki Yoshida

  2009, Publications of the Astronomical Society of Japan, 61(3) (3), 481 - 486, English

  [Refereed]

  Scientific journal


• GreeM: Massively Parallel TreePM Code for Large Cosmological N -body Simulations

  Tomoaki Ishiyama, Toshiyuki Fukushige, Junichiro Makino

  2009, Publications of the Astronomical Society of Japan, 61(6) (6), 1319 - 1330, English

  [Refereed]

  Scientific journal


• Fully Self-consistent N-body Simulation of Star Cluster in the Galactic Center, Dynamical Evolution of Dense Stellar Systems

  Fujii,M.S., Iwasawa,M., Funato,Y., Makino,J.

  2008


• Simulating N-body systems on the grid using dedicated hardware

  Groen, Derek, Zwart, Simon Portegies, McMillan, Steve, Makino, Jun

  2008, Lecture Notes in Computer Science

  [Refereed]

  Scientific journal


• Sixth- and eighth-order Hermite integrator for N-body simulations

  Keigo Nitadori, Junichiro Makino

  2008, New Astronomy, 13(7) (7), 498 - 507

  [Refereed]

  Scientific journal


• Evolution of Star Clusters near the Galactic Center: Fully Self‐Consistent N ‐Body Simulations

  M. Fujii, M. Iwasawa, Y. Funato, J. Makino

  2008, The Astrophysical Journal, 686(2) (2), 1082 - 1093

  [Refereed]

  Scientific journal


• Do-it-yourself computational astronomy

  Makino, Junichiro

  2008, Japanese Journal of Mathematics, 3(1) (1), 49 - 92

  [Refereed]

  Scientific journal


• Distributed N-body simulation on the grid using dedicated hardware

  Derek Groen, Simon Portegies Zwart, Steve McMillan, Jun Makino

  2008, New Astronomy, 13(5) (5), 348 - 358

  [Refereed]

  Scientific journal


• Toward First-Principle Simulations of Galaxy Formation: I. How Should We Choose Star-Formation Criteria in High-Resolution Simulations of Disk Galaxies?

  Takayuki R. Saitoh, Hiroshi Daisaka, Eiichiro Kokubo, Junichiro Makino, Takashi Okamoto, Kohji Tomisaka, Keiichi Wada, Naoki Yoshida

  2008, Publications of the Astronomical Society of Japan, 60(4) (4), 667 - 681, English

  [Refereed]

  Scientific journal


• Environmental Effect on the Subhalo Abundance—a Solution to the Missing Dwarf Problem

  Tomoaki Ishiyama, Toshiyuki Fukushige, Junichiro Makino

  2008, Publications of the Astronomical Society of Japan, 60(4) (4), L13 - L18, English

  [Refereed]

  Scientific journal


• Current status of GRAPE project

  J. Makino

  Sep. 2007, Proceedings of the International Astronomical Union, 3(246) (246), 457 - 466, English

  [Refereed]

  Scientific journal


• Test of the accuracy of approximate methods to handle distant binary-single star encounters

  Yoko Funato, D. C. Heggie, P. Hut, Jun Makino

  Sep. 2007, Proceedings of the International Astronomical Union, 3(246) (246), 469 - 470, English

  [Refereed]

  Scientific journal


• 6th and 8th Order hermite integrator using snap and crackle

  Keigo Nitadori, Masaki Iwasawa, Junichiro Makino

  Sep. 2007, Proceedings of the International Astronomical Union, 3(246) (246), 473 - 474, English

  [Refereed]

  Scientific journal


• Gravitational many-body problem

  Makino, J., Makino, J.

  2007, AIP Conference Proceedings

  [Refereed]

  Scientific journal


• Star cluster ecology - VII. The evolution of young dense star clusters containing primordial binaries

  S. F. Portegies Zwart, S. L. W. McMillan, J. Makino

  2007, Monthly Notices of the Royal Astronomical Society, 374(1) (1), 95 - 106

  [Refereed]

  Scientific journal


• Orbital Evolution of an IMBH in the Galactic Nucleus with a Massive Central Black Hole

  Tatsushi Matsubayashi, Junichiro Makino, Toshikazu Ebisuzaki

  2007, The Astrophysical Journal, 656(2) (2), 879 - 896

  [Refereed]

  Scientific journal


• Modeling Dense Stellar Systems

  P. Hut, S. Mineshige, D. C. Heggie, J. Makino

  2007, Progress of Theoretical Physics, 118(2) (2), 187 - 209

  [Refereed]

  Scientific journal


• Formation of Protoplanets from Massive Planetesimals in Binary Systems

  Yusuke Tsukamoto, Junichiro Makino

  2007, The Astrophysical Journal, 669(2) (2), 1316 - 1323

  [Refereed]

  Scientific journal


• Evolution of Collisionally Merged Massive Stars

  Takeru K. Suzuki, Naohito Nakasato, Holger Baumgardt, Akihiko Ibukiyama, Junichiro Makino, Toshi Ebisuzaki

  2007, The Astrophysical Journal, 668(1) (1), 435 - 448

  [Refereed]

  Scientific journal


• The Core Radius of a Star Cluster Containing a Massive Black Hole

  Douglas C. Heggie, Piet Hut, Shin Mineshige, Junichiro Makino, Holger Baumgardt

  2007, Publications of the Astronomical Society of Japan, 59(3) (3), L11 - L14, English

  [Refereed]

  Scientific journal


• Missing Dwarf Problem in Galaxy Clusters

  Hiroyuki Kase, Junichiro Makino, Yoko Funato

  2007, Publications of the Astronomical Society of Japan, 59(6) (6), 1071 - 1080, English

  [Refereed]

  Scientific journal


• BRIDGE: A Direct-Tree Hybrid $N$-Body Algorithm for Fully Self-Consistent Simulations of Star Clusters and Their Parent Galaxies

  Michiko Fujii, Masaki Iwasawa, Yoko Funato, Junichiro Makino

  2007, Publications of the Astronomical Society of Japan, 59(6) (6), 1095 - 1106, English

  [Refereed]

  Scientific journal


• Special-purpose computing for dense stellar systems

  Junichiro Makino

  Aug. 2006, Proceedings of the International Astronomical Union, 2(14) (14), 424 - 425, English

  [Refereed]

  International conference proceedings


• The GRAPE project

  Makino, J

  2006, Computing in Science & Engineering, 8(1) (1)

  [Refereed]

  Scientific journal


• Tidal capture of stars by intermediate-mass black holes

  H. Baumgardt, C. Hopman, S. Portegies Zwart, J. Makino

  2006, Monthly Notices of the Royal Astronomical Society, 372(1) (1), 467 - 478

  [Refereed]

  Scientific journal


• The Ecology of Star Clusters and Intermediate‐Mass Black Holes in the Galactic Bulge

  Simon F. Portegies Zwart, Holger Baumgardt, Stephen L. W. McMillan, Junichiro Makino, Piet Hut, Toshi Ebisuzaki

  2006, The Astrophysical Journal, 641(1) (1), 319 - 326

  [Refereed]

  Scientific journal


• Performance tuning of N-body codes on modern microprocessors: I. Direct integration with a hermite scheme on x86_64 architecture

  Keigo Nitadori, Junichiro Makino, Piet Hut

  2006, New Astronomy, 12(3) (3), 169 - 181

  [Refereed]

  Scientific journal


• High‐Resolution Simulations of a Moon‐forming Impact and Postimpact Evolution

  Keiichi Wada, Eiichiro Kokubo, Junichiro Makino

  2006, The Astrophysical Journal, 638(2) (2), 1180 - 1186

  [Refereed]

  Scientific journal


• Evolution of Massive Black Hole Triples. I. Equal‐Mass Binary‐Single Systems

  Masaki Iwasawa, Yoko Funato, Junichiro Makino

  2006, The Astrophysical Journal, 651(2) (2), 1059 - 1067

  [Refereed]

  Scientific journal


• A time-symmetric block time-step algorithm for N-body simulations

  Junichiro Makino, Piet Hut, Murat Kaplan, Hasan Saygın

  2006, New Astronomy, 12(2) (2), 124 - 133

  [Refereed]

  Scientific journal


• Dynamical Friction on Satellite Galaxies

  Michiko Fujii, Yoko Funato, Junichiro Makino

  2006, Publications of the Astronomical Society of Japan, 58(4) (4), 743 - 752, English

  [Refereed]

  Scientific journal


• GRAPE-6A: A single-card GRAPE-6 for parallel PC-GRAPE cluster systems

  T Fukushige, J Makino, A Kawai

  Dec. 2005, PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN, 57(6) (6), 1009 - 1021, English

  Scientific journal


• Which globular clusters contain intermediate-mass black holes?

  H Baumgardt, J Makino, P Hut

  Feb. 2005, ASTROPHYSICAL JOURNAL, 620(1) (1), 238 - 243, English

  Scientific journal


• A quantitative analysis of the acidosis of cardiac arrest: a prospective observational study

  Makino, J, Uchino, S, Morimatsu, H, Bellomo, R

  2005, Critical Care, 9(4) (4)

  [Refereed]

  Scientific journal


• GRAPE and Project Milkyway

  2005, Journal of the Korean Astronomical Society


• GRAPE-6A: A Single-Card GRAPE-6 for Parallel PC-GRAPE Cluster Systems

  Toshiyuki Fukushige, Junichiro Makino, Atsushi Kawai

  2005, Publications of the Astronomical Society of Japan, 57(6) (6), 1009 - 1021, English

  [Refereed]

  Scientific journal


• Formation and evolution of massive black holes in star clusters

  Baumgardt, Holger, Makino, Junichiro, Zwart, Simon Portegies, Engvold, O

  2005, Highlights of Astronomy, Vol 13, 13, 350 - 353

  [Refereed]

  Scientific journal


• Black hole binary mergers

  Makino Junichiro

  2005, Modelling of Stellar Atmospheres, 13, 339 - 342

  [Refereed]

  Scientific journal


• PGPG: An Automatic Generator of Pipeline Design for Programmable GRAPE Systems

  Tsuyoshi Hamada, Toshiyuki Fukushige, Junichiro Makino

  2005, Publications of the Astronomical Society of Japan, 57(5) (5), 799 - 813, English

  [Refereed]

  Scientific journal


• Formation of omega Centauri by tidal stripping of a dwarf galaxy

  M Ideta, J Makino

  Dec. 2004, ASTROPHYSICAL JOURNAL, 616(2) (2), L107 - L110, English

  Scientific journal


• Massive black holes in star clusters. II. Realistic cluster models

  H Baumgardt, J Makino, T Ebisuzaki

  Oct. 2004, ASTROPHYSICAL JOURNAL, 613(2) (2), 1143 - 1156, English

  Scientific journal


• Massive black holes in star clusters. I. Equal-mass clusters

  H Baumgardt, J Makino, T Ebisuzaki

  Oct. 2004, ASTROPHYSICAL JOURNAL, 613(2) (2), 1133 - 1142, English

  Scientific journal


• A modified Hermite integrator for planetary dynamics

  E Kokubo, J Makino

  Oct. 2004, PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN, 56(5) (5), 861 - 868, English

  Scientific journal


• Star cluster ecology - V. Dissection of an open star cluster: spectroscopy

  S Portegies Zwart, P Hut, SLW McMillan, J Makino

  Jun. 2004, MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 351(2) (2), 473 - 486, English

  Scientific journal


• A fast parallel treecode with GRAPE

  J Makino

  Jun. 2004, PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN, 56(3) (3), 521 - 531, English

  Scientific journal


• Structure of dark matter halos from hierarchical clustering. III. Shallowing of the inner cusp

  T Fukushige, A Kawai, J Makino

  May 2004, ASTROPHYSICAL JOURNAL, 606(2) (2), 625 - 634, English

  Scientific journal


• Formation of massive black holes through runaway collisions in dense young star clusters

  SFP Zwart, H Baumgardt, P Hut, J Makino, SLW McMillan

  Apr. 2004, NATURE, 428(6984) (6984), 724 - 726, English

  Scientific journal


• Performance analysis of high-accuracy tree code based on the pseudoparticle multipole method

  A Kawai, J Makino, T Ebisuzaki

  Mar. 2004, ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES, 151(1) (1), 13 - 33, English

  Scientific journal


• The formation of Kuiper-belt binaries through exchange reactions

  Y Funato, J Makino, P Hut, E Kokubo, D Kinoshita

  Feb. 2004, NATURE, 427(6974) (6974), 518 - 520, English

  Scientific journal


• Evolution of massive black hole binaries

  J Makino, Y Funato

  Feb. 2004, ASTROPHYSICAL JOURNAL, 602(1) (1), 93 - 102, English

  Scientific journal


• Dynamics of intermediate mass black holes in star clusters

  H Baumgardt, SFP Zwart, SLW McMillan, J Makino, T Ebisuzaki

  2004, Formation and Evolution of Massive Young Star Clusters, 322, 459 - 467, English

  [Refereed]

  International conference proceedings


• Inner structure of dark matter halos

  T Fukushige, A Kawai, J Makino

  2004, DARK MATTER IN GALAXIES, (220) (220), 99 - 100, English

  [Refereed]

  Scientific journal


• Intermediate mass black holes in star clusters

  H Baumgardt, J Makino

  2004, PROGRESS OF THEORETICAL PHYSICS SUPPLEMENT, (155) (155), 313 - 314, English

  [Refereed]

  Scientific journal


• Black holes in massive star clusters

  S McMillan, H Baumgardt, SIP Zwart, P Hut, J Makino

  2004, Formation and Evolution of Massive Young Star Clusters, 322, 449 - 457, English

  [Refereed]

  International conference proceedings


• A Fast Parallel Treecode with GRAPE

  MAKINO J

  Astronomical Society of Japan, 2004, PASJ, 56(3) (3), 521 - 531, English


• GRAPE-6: Massively-parallel special-purpose computer for astrophysical particle simulations

  J Makino, T Fukushige, M Koga, K Namura

  Dec. 2003, PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN, 55(6) (6), 1163 - 1187, English

  Scientific journal


• Dynamical formation of close binary systems in globular clusters

  D Pooley, WHG Lewin, SF Anderson, H Baumgardt, AV Filippenko, BM Gaensler, L Homer, P Hut, VM Kaspi, J Makino, B Margon, S McMillan, S Portegies Zwart, M van der Klis, F Verbunt

  Jul. 2003, ASTROPHYSICAL JOURNAL, 591(2) (2), L131 - L134, English

  Scientific journal


• Structure of dark matter halos from hierarchical clustering. II. Dependence of cosmological models in cluster-sized halos

  T Fukushige, J Makino

  May 2003, ASTROPHYSICAL JOURNAL, 588(2) (2), 674 - 679, English

  Scientific journal


• Parameters of core collapse

  H Baumgardt, DC Heggie, P Hut, J Makino

  May 2003, MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 341(1) (1), 247 - 250, English

  Scientific journal


• MODEST-1: Integrating stellar evolution and stellar dynamics

  P Hut, MM Shara, SJ Aarseth, RS Klessen, JC Lombardi, J Makino, S McMillan, OR Pols, PJ Teuben, RF Webbink

  May 2003, NEW ASTRONOMY, 8(4) (4), 337 - 370, English


• A dynamical model for the globular cluster G1

  H Baumgardt, J Makino, P Hut, S McMillan, S Portegies Zwart

  May 2003, ASTROPHYSICAL JOURNAL, 589(1) (1), L25 - L28, English

  Scientific journal


• Dynamical evolution of star clusters in tidal fields

  H Baumgardt, J Makino

  Mar. 2003, MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 340(1) (1), 227 - 246, English

  Scientific journal


• Performance evaluation and tuning of GRAPE-6 - Towards 40 "real" Tflops

  Junichiro Makino, Eiichiro Kokubo, Toshiyuki Fukushige, Hiroshi Daisaka

  2003, Proceedings of the 2003 ACM/IEEE Conference on Supercomputing, SC 2003, English

  [Refereed]

  International conference proceedings


• Collisional dynamics of binary black holes in galactic centres

  R Spurzem, M Hemsendorf, S Sigurdsson, M Benacquista, J Makino

  2003, ASTROPHYSICS OF GRAVITATIONAL WAVE SOURCES, 686, 235 - 238, English

  [Refereed]

  International conference proceedings


• To circularize or not to circularize? Orbital evolution of satellite galaxies

  Y Hashimoto, Y Funato, J Makino

  Jan. 2003, ASTROPHYSICAL JOURNAL, 582(1) (1), 196 - 201, English

  Scientific journal


• On the central structure of M15

  H Baumgardt, P Hut, J Makino, S McMillan, S Portegies Zwart

  Jan. 2003, ASTROPHYSICAL JOURNAL, 582(1) (1), L21 - L24, English

  Scientific journal


• An efficient parallel algorithm for O(N-2) direct summation method and its variations on distributed-memory parallel machines

  J Makino

  Oct. 2002, NEW ASTRONOMY, 7(7) (7), 373 - 384, English

  Scientific journal


• Collisional evolution of galaxy clusters and the growth of common halos

  K Takahashi, T Sensui, Y Funato, J Makino

  Feb. 2002, PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN, 54(1) (1), 5 - 20, English

  Scientific journal


• A 29.5 Tflops simulation of planetesimals in Uranus-Neptune region on GRAPE-6

  Junichiro Makino, Eiichiro Kokubo, Toshiyuki Fukushige, Hiroshi Daisaka

  Association for Computing Machinery, 2002, Proceedings of the International Conference on Supercomputing, 2002-, English

  International conference proceedings


• An efficient parallel algorithm for 0(N2) direct summation method and its variations on distributed-memory parallel machines

  Junichiro Makino

  Elsevier, 2002, New Astronomy, 7(7) (7), 373 - 384, English

  [Refereed]

  Scientific journal


• Runaway collisions in star clusters

  SFP Zwart, J Makino, SLW McMillan, P Hut

  2002, STELLAR COLLISIONS, MERGERS, AND THEIR CONSEQUENCES, 263, 95 - 109, English

  [Refereed]

  International conference proceedings


• Theory in a Virtual Observatory

  P Teuben, D DeYoung, P Hut, S Levy, J Makino, S McMillan, SP Zwart, S Slavin

  2002, ASTRONOMICAL DATA ANALYSIS SOFTWARE AND SYSTEMS XI, 281, 7 - 10, English

  [Refereed]

  International conference proceedings


• Heterogeneous multi-computer system: A new paradigm of parallel processing

  T Boku, J Makino, H Susa, M Umemura, T Fukushige, A Ukawa

  2002, PAR ELEC 2002: INTERNATIONAL CONFERENCE ON PARALLEL COMPUTING IN ELECTRICAL ENGINEERING, 3 - 8, English

  [Refereed]

  International conference proceedings


• Heterogeneous Multi-Computer System: A New Platform for Multi-Paradigm Scientific Simulation

  T., Boku, J., Makino, H., Susa, M., Umemura, T., Fukushige, A., Ukawa

  Jan. 2002, Proc. of ICS2002, New York, 26-34, English

  [Refereed]

  International conference proceedings


• Hydrodynamics in astrophysics with gravity on Heterogeneous Multi-Computer System

  T., Boku, J., Makino, H., Susa, M., Umemura, T., Fukushige, and, A. Ukawa

  Jan. 2002, IPSJ Transactions on High Performance Computing Systems, 41, 5, Japanese

  [Refereed]

  Scientific journal


• Missing link found? The "runaway" path to supermassive black holes

  T Ebisuzaki, J Makino, TG Tsuru, Y Funato, S Portegies Zwart, P Hut, S McMillan, S Matsushita, H Matsumoto, R Kawabe

  Nov. 2001, ASTROPHYSICAL JOURNAL, 562(1) (1), L19 - L22, English

  Scientific journal


• GRAPE project: special-purpose computers for many-body simulations

  J Makino

  Sep. 2001, COMPUTER PHYSICS COMMUNICATIONS, 139(1) (1), 45 - 54, English

  Scientific journal


• Structure of dark matter halos from hierarchical clustering

  T Fukushige, J Makino

  Aug. 2001, ASTROPHYSICAL JOURNAL, 557(2) (2), 533 - 545, English

  Scientific journal


• Pseudoparticle multipole method: A simple method to implement a high-accuracy tree code

  A Kawai, J Makino

  Apr. 2001, ASTROPHYSICAL JOURNAL, 550(2) (2), L143 - L146, English

  Scientific journal


• Star cluster ecology - IV. Dissection of an open star cluster: photometry

  S Portegies Zwart, SLW McMillan, P Hut, J Makino

  Feb. 2001, MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 321(2) (2), 199 - 226, English


• Evolution of clusters of galaxies

  T Sensui, Y Funato, J Makino

  2001, PHYSICS OF GALAXY FORMATION, PROCEEDINGS, 222, 401 - 404, English

  [Refereed]

  International conference proceedings


• Star clusters simulations using GRAPE-5

  T Fukushige, A Kawai, J Makino

  2001, DYNAMICS OF STAR CLUSTERS AND THE MILKY WAY, 228, 434 - 436, English

  [Refereed]

  International conference proceedings


• How many young star clusters exist in the Galactic center?

  S Portegies Zwart, J Makino, SLW McMillan, P Hut

  Jan. 2001, ASTROPHYSICAL JOURNAL, 546(2) (2), L101 - L104, English

  Scientific journal


• Evolution of a circumterrestrial disk and formation of a single moon

  E Kokubo, S Ida, J Makino

  Dec. 2000, ICARUS, 148(2) (2), 419 - 436, English

  Scientific journal


• PROGRAPE-1: A programmable, multi-purpose computer for many-body simulations

  T Hamada, T Fukushige, A Kawai, J Makino

  Oct. 2000, PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN, 52(5) (5), 943 - 954, English

  Scientific journal


• GRAPE-5: A special-purpose computer for N-body simulations

  A Kawai, T Fukushige, J Makino, M Taiji

  Aug. 2000, PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN, 52(4) (4), 659 - 676, English

  Scientific journal


• A 1.349 Tflops simulation of black holes in a galactic center on GRAPE-6

  Junichiro Makino, Toshiyuki Fukushige, Masaki Koga

  Association for Computing Machinery, 2000, Proceedings of the International Conference on Supercomputing, 2000-, English

  International conference proceedings


• GRAPE project: A decade of special-purpose computers for many-body simulations

  J Makino, M Koga, A Kawai, T Fukushige

  2000, PROGRESS OF THEORETICAL PHYSICS SUPPLEMENT, (138) (138), 622 - 631, English

  [Refereed]

  Scientific journal


• Evolution of clusters of galaxies: Mass stripping from galaxies and growth of common halos

  T Sensui, Y Funato, J Makino

  Dec. 1999, PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN, 51(6) (6), 943 - 954, English

  Scientific journal


• On the cusp around central black holes in luminous elliptical galaxies

  T Nakano, J Makino

  Nov. 1999, ASTROPHYSICAL JOURNAL, 525(2) (2), L77 - L80, English

  Scientific journal


• Star cluster ecology - III. Runaway collisions in young compact star clusters

  S Portegies Zwart, J Makino, SLW McMillan, P Hut

  Aug. 1999, ASTRONOMY & ASTROPHYSICS, 348(1) (1), 117 - 126, English

  Scientific journal


• The stability of protoplanet systems

  K Yoshinaga, E Kokubo, J Makino

  Jun. 1999, ICARUS, 139(2) (2), 328 - 335, English

  Scientific journal


• High-performance special-purpose computers in science

  T Fukushige, P Hut, J Makino

  Mar. 1999, COMPUTING IN SCIENCE & ENGINEERING, 1(2) (2), 12 - +, English

  [Refereed]

  Scientific journal


• Change in mass and energy of galaxies through mutual encounters

  Y Funato, J Makino

  Feb. 1999, ASTROPHYSICAL JOURNAL, 511(2) (2), 625 - 638, English

  Scientific journal


• Star cluster ecology: III. Runaway collisions in young compact star clusters

  S. F. Portegies Zwart, J. Makino, S. L.W. McMillan, P. Hut

  1999, Astronomy and Astrophysics, 348(1) (1), 117 - 126, English

  Scientific journal


• $7.0/Mflops astrophysical N-body simulation with treecode on GRAPE-5

  Atsushi Kawai, Toshiyuki Fukushige, Junichiro Makino

  Institute of Electrical and Electronics Engineers Inc., 1999, ACM/IEEE SC 1999 Conference, SC 1999, 66, English

  [Refereed]

  International conference proceedings


• N-body simulation of dark matter halo formation using grape

  T Fukushige, J Makino

  1999, NUMERICAL ASTROPHYSICS, 240, 29 - 32, English

  [Refereed]

  International conference proceedings


• On the origin of density cusps in elliptical galaxies

  T Nakano, J Makino

  Jan. 1999, ASTROPHYSICAL JOURNAL, 510(1) (1), 155 - 166, English

  Scientific journal


• Computational physics - Astrophysics on the GRAPE family of special-purpose computers

  P Hut, J Makino

  Jan. 1999, SCIENCE, 283(5401) (5401), 501 - 505, English


• On the dissolution of evolving star clusters

  Simon F. Portegies Zwart, Piet Hut, Junichiro Makino, Stephen L. W. McMillan

  Sep. 1998, Astronomy and Astrophysics, 337(2) (2), 363 - 371, English

  Scientific journal


• On the dissolution of evolving star clusters

  S Portegies Zwart, P Hut, J Makino, SLW McMillan

  Sep. 1998, ASTRONOMY & ASTROPHYSICS, 337(2) (2), 363 - 371, English

  Scientific journal


• On the mass distribution of planetesimals in the early runaway stage

  J Makino, T Fukushige, Y Funato, E Kokubo

  Aug. 1998, NEW ASTRONOMY, 3(7) (7), 411 - 417, English

  Scientific journal


• On a time-symmetric Hermite integrator for planetary N-body simulation

  E Kokubo, K Yoshinaga, J Makino

  Jul. 1998, MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 297(4) (4), 1067 - 1072, English

  Scientific journal


• Performance and accuracy of a GRAPE-3 system for collisionless N-body simulations

  E Athanassoula, A Bosma, JC Lambert, J Makino

  Feb. 1998, MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 293(4) (4), 369 - 380, English

  Scientific journal


• On the mass distribution of planetesimals in the early runaway stage

  Junichiro Makino, Toshiyuki Fukushige, Yoko Funato, Eiichiro Kokubo

  Elsevier, 1998, New Astronomy, 3(7) (7), 411 - 417, English

  [Refereed]

  Scientific journal


• On the origin of density cusp in galactic nuclei with central black hole

  T Nakano, T Fukushige, J Makino

  1998, CENTRAL REGIONS OF THE GALAXY AND GALAXIES, 487 - 488, English

  [Refereed]

  International conference proceedings


• The PCI interface for GRAPE systems: PCI-HIB

  A Kawai, T Fukushige, M Taiji, J Makino, D Sugimoto

  Oct. 1997, PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN, 49(5) (5), 607 - 618, English

  Scientific journal


• Gravothermal expansion in N-body systems

  H Endoh, T Fukushige, J Makino

  Jun. 1997, PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN, 49(3) (3), 345 - 352, English

  Scientific journal


• Merger rate of equal-mass spherical galaxies

  J Makino, P Hut

  May 1997, ASTROPHYSICAL JOURNAL, 481(1) (1), 83 - 94, English

  Scientific journal


• Grape-4: A massively parallel special-purpose computer for collisional N-body simulations

  J Makino, M Taiji, T Ebisuzaki, D Sugimoto

  May 1997, ASTROPHYSICAL JOURNAL, 480(1) (1), 432 - 446, English

  Scientific journal


• Evolution of compact groups of galaxies .1. Merging rates

  E Athanassoula, J Makino, A Bosma

  Apr. 1997, MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 286(4) (4), 825 - 838, English

  [Refereed]

  Scientific journal


• On the origin of cusps in dark matter halos

  T Fukushige, J Makino

  Mar. 1997, ASTROPHYSICAL JOURNAL, 477(1) (1), L9 - L12, English

  Scientific journal


• Merging of galaxies with central black holes .2. Evolution of the black hole binary and the structure of the core

  J Makino

  Mar. 1997, ASTROPHYSICAL JOURNAL, 478(1) (1), 58 - 65, English

  Scientific journal


• Time symmetrization meta-algorithms

  P Hut, Y Funato, E Kokubo, J Makino, S McMillan

  1997, 12TH KINGSTON MEETING : COMPUTATIONAL ASTROPHYSICS, 123, 26 - 31, English

  [Refereed]

  International conference proceedings


• Productivity of Research Groups : Relation between citation Analysis and Reputation within Research Community

  牧野 淳一郎, 藤垣 裕子, 今井 良行

  科学・技術と社会の会 ; 1992-, 1997, 年報科学・技術・社会, 6, 85 - 100, Japanese


• Postcollapse evolution of globular clusters

  J Makino

  Nov. 1996, ASTROPHYSICAL JOURNAL, 471(2) (2), 796 - 803, English


• Time-symmetrized Kustaanheimo-Stiefel regularization

  Y Funato, P Hut, S McMillan, J Makino

  Oct. 1996, ASTRONOMICAL JOURNAL, 112(4) (4), 1697 - 1708, English

  Scientific journal


• GRAPE: A Special-Purpose Computer System for Astrophysical Many-Body Simulations

  TAIJI Makoto, MAKINO Junichiro

  In this paper we describe special-purpose computers for astrophysical N-body simulations , GRAPE (GRAvity PipE) . GRAPE is a hardware accelerator to calculate gravitational forces on particles . We have developed a massively-parallel machine, GRAPE-4 . GRAPE-4 has 1,692 special-purpose pipeline LSI of 640 megaflops . Its peak performance reaches 1.08 Tflops and its sustained performance is 0.5 Tflops with 4 x 10^5 particles. The special-purpose computers , especially GRAPE , will become important tools in computational sciences.

  プラズマ・核融合学会, Sep. 1996, Journal of plasma and fusion research, 72(9) (9), 920 - 925, Japanese


• A highly parallelized special-purpose computer for many-body simulations with an arbitrary central force: MD-GRAPE

  T Fukushige, M Taiji, J Makino, T Ebisuzaki, D Sugimoto

  Sep. 1996, ASTROPHYSICAL JOURNAL, 468(1) (1), 51 - 61, English

  Scientific journal


• Merging of galaxies with central black holes .1. Hierarchical mergings of equal-mass galaxies

  J Makino, T Ebisuzaki

  Jul. 1996, ASTROPHYSICAL JOURNAL, 465(2) (2), 527 - 533, English

  Scientific journal


• N-body simulation of galaxy formation on GRAPE-4 special-purpose computer

  Toshiyuki Fukushige, Junichiro Makino

  Association for Computing Machinery, 1996, Proceedings of the International Conference on Supercomputing, 1996-, English

  International conference proceedings


• GRAPE-4: A teraflops machine for N-body simulations

  M Taiji, J Makino, T Fukushige, T Ebisuzaki, D Sugimoto

  1996, DYNAMICAL EVOLUTION OF STAR CLUSTERS - CONFRONTATION OF THEORY AND OBSERVATIONS, (174) (174), 141 - 150, English

  [Refereed]

  Scientific journal


• Evolution of galaxies through their interaction

  Y Funato, J Makino

  1996, NEW LIGHT ON GALAXY EVOLUTION, (171) (171), 378 - 378, English

  [Refereed]

  Scientific journal


• Exponential growth of distance between nearby rays due to multiple gravitational lensing

  T Fukushige, J Makino

  1996, ASTROPHYSICAL APPLICATIONS OF GRAVITATIONAL LENSING, (173) (173), 93 - 94, English

  [Refereed]

  Scientific journal


• Time-symmetrized Kustaanheimo-Stiefel regularization

  Y Funato, J Makino, P Hut, S McMillan

  1996, DYNAMICAL EVOLUTION OF STAR CLUSTERS - CONFRONTATION OF THEORY AND OBSERVATIONS, (174) (174), 367 - 368, English

  [Refereed]

  Scientific journal


• Effect of multiple gravitational lensing on the anisotropy of the cosmic background radiation

  T Fukushige, J Makino, T Ebisuzaki

  1996, ASTROPHYSICAL APPLICATIONS OF GRAVITATIONAL LENSING, (173) (173), 95 - 96, English

  [Refereed]

  Scientific journal


• BUILDING A BETTER LEAPFROG

  P HUT, J MAKINO, S MCMILLAN

  Apr. 1995, ASTROPHYSICAL JOURNAL, 443(2) (2), L93 - L96, English

  Scientific journal


• GRAPE project for a dedicated tera-flops computer

  Daiichiro Sugimoto, Junichiro Makino, Makoto Taiji, Toshikazu Ebisuzaki

  Institute of Electrical and Electronics Engineers Inc., 1995, Proceedings - 1st Aizu International Symposium on Parallel Algorithms/Architecture Synthesis, AISPAS 1995, 38 - 44, English

  International conference proceedings


• GRAPE-4 - A SPECIAL-PURPOSE COMPUTER FOR GRAVITATIONAL N-BODY PROBLEMS

  J MAKINO, M TAIJI, T EBISUZAKI, D SUGIMOTO

  1995, PROCEEDINGS OF THE SEVENTH SIAM CONFERENCE ON PARALLEL PROCESSING FOR SCIENTIFIC COMPUTING, 343 - 348, English

  [Refereed]

  International conference proceedings


• Astrophysical N-body simulations on GRAPE-4 special-purpose computer

  J Makino, M Taiji

  1995, SUPERCOMPUTING '95, PROCEEDINGS, VOLS 1 AND 2, 1776 - 1785, English

  [Refereed]

  International conference proceedings


• SMOOTHING OF THE ANISOTROPY OF THE COSMIC BACKGROUND-RADIATION BY MULTIPLE GRAVITATIONAL SCATTERING

  T FUKUSHIGE, J MAKINO, O NISHIMURA, T EBISUZAKI

  1995, PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN, 47(5) (5), 493 - 508, English

  Scientific journal


• SMOOTHING OF THE ANISOTROPY OF THE COSMIC BACKGROUND-RADIATION BY MULTIPLE GRAVITATIONAL SCATTERING

  T FUKUSHIGE, J MAKINO, O NISHIMURA, T EBISUZAKI

  1995, PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN, 47(5) (5), 493 - 508, English

  Scientific journal


• THE EFFECT OF GRAVITATIONAL SCATTERING ON THE ANISOTROPY OF THE COSMIC BACKGROUND-RADIATION

  T FUKUSHIGE, J MAKINO, T EBISUZAKI

  Dec. 1994, ASTROPHYSICAL JOURNAL, 436(2) (2), L107 - L110, English

  Scientific journal


• APPLICATION OF A HIGH-PERFORMANCE, SPECIAL-PURPOSE COMPUTER, GRAPE-2A, TO MOLECULAR-DYNAMICS

  J HIGO, S ENDO, K NAGAYAMA, T ITO, T FUKUSHIGE, T EBISUZAKI, D SUGIMOTO, H MIYAGAWA, K KITAMURA, J MAKINO

  Dec. 1994, JOURNAL OF COMPUTATIONAL CHEMISTRY, 15(12) (12), 1372 - 1376, English

  Scientific journal


• EXPONENTIAL-GROWTH OF DISTANCE BETWEEN NEARBY RAYS DUE TO MULTIPLE GRAVITATIONAL SCATTERINGS

  T FUKUSHIGE, J MAKINO

  Dec. 1994, ASTROPHYSICAL JOURNAL, 436(2) (2), L111 - L114, English

  Scientific journal


• ATTENUATION OF LUMINOSITY OF DISTANT GALAXIES BY MULTIPLE GRAVITATIONAL LENSING

  Y FUNATO, J MAKINO, T EBISUZAKI

  Mar. 1994, ASTROPHYSICAL JOURNAL, 424(1) (1), L17 - L20, English

  Scientific journal


• HARP chip : a 600 Mflops application-specific LSI for astrophysical N-body simulations

  Makoto Taiji, Junichiro Makino, Eiichiro Kokubo, Toshikazu Ebisuzaki, Daiichiro Sugimoto

  Publ by IEEE, 1994, Proceedings of the Hawaii International Conference on System Sciences, 1, 302 - 311, English

  International conference proceedings


• HARP-1: a special-purpose computer for N-body simulation with the hermite integrator

  Eiichiro Kokubo, Junichiro Makino, Makoto Taiji

  Publ by IEEE, 1994, Proceedings of the Hawaii International Conference on System Sciences, 1, 292 - 301, English

  International conference proceedings


• GRAPE-4: a teraflops massively parallel special-purpose computer system for astrophysical N-body simulations

  Makoto Taiji, Junichiro Makino, Toshikazu Ebisuzaki, Daiichiro Sugimoto

  Publ by IEEE, 1994, Proceedings of the International Conference on Parallel Processing, 280 - 287, English

  International conference proceedings


• DREAM-1A: special-purpose computer for computational fluid dynamics

  Yousuke Ohno, Junichiro Makino, Izumi Hachisu, Toshikazu Ebisuzaki, Daiichiro Sugimoto

  Publ by IEEE, 1994, Proceedings of the Hawaii International Conference on System Sciences, 1, 282 - 291, English

  International conference proceedings


• GRAPE-4 - A ONE-TFLOPS SPECIAL-PURPOSE COMPUTER FOR ASTROPHYSICAL N-BODY PROBLEM

  J MAKINO, M TAIJI, T EBISUZAKI, D SUGIMOTO

  1994, SUPERCOMPUTING '94, PROCEEDINGS, 429 - 438, English

  [Refereed]

  International conference proceedings


• WINE-1 - A SPECIAL PURPOSE COMPUTER FOR PARTICLE DYNAMICS SIMULATION BASED ON THE EWALD METHOD

  T FUKUSHIGE, J MAKINO, T ITO, SK OKUMURA, T EBISUZAKI, D SUGIMOTO

  1994, ADVANCED MATERIALS '93, III - A & B, 16(A & B) (A & B), 153 - 156, English

  [Refereed]

  International conference proceedings


• GRAPE - SPECIAL PURPOSE COMPUTER FOR SIMULATIONS OF MANY-BODY SYSTEMS

  T EBISUZAKI, E KOKUBO, T FUKUSHIGE, M TAIJI, J MAKINO, D SUGIMOTO, T ITO

  1994, ADVANCED MATERIALS '93, III - A & B, 16(A & B) (A & B), 149 - 152, English

  [Refereed]

  International conference proceedings


• A special‐purpose computer for molecular dynamics: GRAPE‐2A

  Tomoyoshi Ito, Toshiyuki Fukushige, Junichiro Makino, Toshikazu Ebisuzaki, Sachiko K. Okumura, Daiichiro Sugimoto, Hiroo Miyagawa, Kunihiro Kitamura

  1994, Proteins: Structure, Function, and Bioinformatics, 20(2) (2), 139 - 148, English

  Scientific journal


• Triple Black Holes in the core of galaxies

  1994, The astrophysical Journal, 436, 607


• SCATTERING OF PLANETESIMALS BY A PROTOPLANET - SLOWING-DOWN OF RUNAWAY GROWTH

  S IDA, J MAKINO

  Nov. 1993, ICARUS, 106(1) (1), 210 - 227, English

  Scientific journal


• DREAM - 1A : Special - Purpose Computer for Computational Fluid Dynamics

  Ohno Yousuke, Makino Junichiro, Hachisu Izumi, Ebisuzaki Toshikazu, Sugimoto Daiichiro

  We have developed a special-purpose computer for computational fluid dynamics, DREAM-1A. In computational fluid dynamics, the size of the memory limits the size of the calculation. A DREAM system realizes cheap large memory by using hard disk as the main memory. DREAM-1A has a memory size of 1.6 Gbyte and sustained calculating speed of 14 Mflops, and its cost is about one million yen. The hard disk has two difficulties. The transfer rate is lower than that of a silicon memory, and the access time is also much longer. We improve the transfer rate by parallelization. In addition, the amount of the data transfer is reduced by adding a small fast memory made by silicon chips. This small memory also increase the block size of transfer, thereby reducing the overhead due to the access time.

  Information Processing Society of Japan (IPSJ), Aug. 1993, IPSJ SIG Notes, 1993(72) (72), 41 - 48, Japanese


• THE ORIGIN OF ANISOTROPIC VELOCITY DISPERSION OF PARTICLES IN A DISC POTENTIAL

  S IDA, E KOKUBO, J MAKINO

  Aug. 1993, MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 263(4) (4), 875 - 889, English

  Scientific journal


• A special purpose computer for particle dynamics simulation based on Ewald method: WINE-1

  Toshiyuki Fukushige, Junichiro Makino, Tomoyoshi Ito, Sachiko K. Okumura, Toshikazu Ebisuzaki, Daiichiro Sugimoto

  IEEE Computer Society, 1993, Proceedings of the Annual Hawaii International Conference on System Sciences, 1, 124 - 133, English

  International conference proceedings


• HIGHLY PARALLELIZED SPECIAL-PURPOSE COMPUTER, GRAPE-3

  SK OKUMURA, J MAKINO, T EBISUZAKI, T FUKUSHIGE, T ITO, D SUGIMOTO, E HASHIMOTO, K TOMIDA, N MIYAKAWA

  1993, PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN, 45(3) (3), 329 - 338, English

  [Refereed]

  Scientific journal


• DREAM-1 - SPECIAL-PURPOSE COMPUTER FOR COMPUTATIONAL FLUID-DYNAMICS

  Y OHNO, J MAKINO, HACHISU, I, M UENO, T EBISUZAKI, D SUGIMOTO, SK OKUMURA, Y CHIKADA

  1993, PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN, 45(3) (3), 377 - 392, English

  [Refereed]

  Scientific journal


• GRAPE - SPECIAL-PURPOSE COMPUTER FOR SIMULATIONS OF MANY-BODY SYSTEMS

  T EBISUZAKI, T ITO, T FUKUSHIGE, J MAKINO, SK OKUMURA, D SUGIMOTO, E HASHIMOTO, K TOMIDA, N MIYAKAWA

  1993, COMPUTER AIDED INNOVATION OF NEW MATERIALS II, PTS 1 AND 2, 1171 - 1176, English

  [Refereed]

  International conference proceedings


• N体問題専用計算機:GRAPE 2A

  1993, 45,339


• N体シミュレーションにおける離散化誤差と力の誤差について

  1993, 402,85


• HARP:N体問題専用計算機

  1993, 45,349


• THE GRAPE SOFTWARE SYSTEM

  J MAKINO, Y FUNATO

  1993, PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN, 45(3) (3), 279 - 288, English

  Scientific journal


• DISCRETENESS NOISE VERSUS FORCE ERRORS IN N-BODY SIMULATIONS

  L HERNQUIST, P HUT, J MAKINO

  Jan. 1993, ASTROPHYSICAL JOURNAL, 402(2) (2), L85 - L88, English

  Scientific journal


• GRAPE PROJECT - AN OVERVIEW

  T EBISUZAKI, J MAKINO, T FUKUSHIGE, M TAIJI, D SUGIMOTO, T ITO, SK OKUMURA

  1993, PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN, 45(3) (3), 269 - 278, English

  Scientific journal


• A SPECIAL-PURPOSE COMPUTER FOR N-BODY SIMULATIONS - GRAPE-2A

  T ITO, J MAKINO, T FUKUSHIGE, T EBISUZAKI, SK OKUMURA, D SUGIMOTO

  1993, PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN, 45(3) (3), 339 - 347, English

  Scientific journal


• HARP - A SPECIAL-PURPOSE COMPUTER FOR N-BODY PROBLEM

  J MAKINO, E KOKUBO, M TAIJI

  1993, PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN, 45(3) (3), 349 - 360, English

  Scientific journal


• WINE-1 - SPECIAL-PURPOSE COMPUTER FOR N-BODY SIMULATIONS WITH A PERIODIC BOUNDARY-CONDITION

  T FUKUSHIGE, J MAKINO, T ITO, SK OKUMURA, T EBISUZAKI, D SUGIMOTO

  1993, PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN, 45(3) (3), 361 - 375, English

  Scientific journal


• Evolution of Cluster of Galaxies

  1993, Publications of the Astronomical Society of Japan, 45,289


• THE EVOLUTION OF MASSIVE BLACK-HOLE BINARIES IN MERGING GALAXIES .1. EVOLUTION OF A BINARY IN A SPHERICAL GALAXY

  J MAKINO, T FUKUSHIGE, SK OKUMURA, T EBISUZAKI

  1993, PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN, 45(3) (3), 303 - 310, English

  Scientific journal


• SMOOTHED PARTICLE HYDRODYNAMICS WITH GRAPE-1A

  M UMEMURA, T FUKUSHIGE, J MAKINO, T EBISUZAKI, D SUGIMOTO, EL TURNER, A LOEB

  1993, PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN, 45(3) (3), 311 - 320, English

  Scientific journal


• THE GRAPE SOFTWARE SYSTEM

  J MAKINO, Y FUNATO

  1993, PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN, 45(3) (3), 279 - 288, English

  Scientific journal


• THE EVOLUTION OF MASSIVE BLACK-HOLE BINARIES IN MERGING GALAXIES .1. EVOLUTION OF A BINARY IN A SPHERICAL GALAXY

  J MAKINO, T FUKUSHIGE, SK OKUMURA, T EBISUZAKI

  1993, PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN, 45(3) (3), 303 - 310, English

  Scientific journal


• HARP - A SPECIAL-PURPOSE COMPUTER FOR N-BODY PROBLEM

  J MAKINO, E KOKUBO, M TAIJI

  1993, PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN, 45(3) (3), 349 - 360, English

  Scientific journal


• EVOLUTION OF CLUSTERS OF GALAXIES

  Y FUNATO, J MAKINO, T EBISUZAKI

  1993, PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN, 45(3) (3), 289 - 302, English

  Scientific journal


• GRAVITATIONAL-WAVE BURST PRODUCED BY MERGING OF CENTRAL BLACK-HOLES OF GALAXIES

  T FUKUSHIGE, T EBISUZAKI, J MAKINO

  Sep. 1992, ASTROPHYSICAL JOURNAL, 396(2) (2), L61 - L63, English

  [Refereed]

  Scientific journal


• N-BODY SIMULATION OF GRAVITATIONAL INTERACTION BETWEEN PLANETESIMALS AND A PROTOPLANET .2. DYNAMIC FRICTION

  S IDA, J MAKINO

  Jul. 1992, ICARUS, 98(1) (1), 28 - 37, English

  [Refereed]

  Scientific journal


• N-BODY SIMULATION OF GRAVITATIONAL INTERACTION BETWEEN PLANETESIMALS AND A PROTOPLANET .1. VELOCITY DISTRIBUTION OF PLANETESIMALS

  S IDA, JI MAKINO

  Mar. 1992, ICARUS, 96(1) (1), 107 - 120, English

  Scientific journal


• VIOLENT RELAXATION IS NOT A RELAXATION PROCESS

  Y FUNATO, J MAKINO, T EBISUZAKI

  1992, PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN, 44(6) (6), 613 - 621, English

  [Refereed]

  Scientific journal


• 微惑星と原始惑星の相互作用のN体計算.I微惑星の速度分布

  1992, 96


• 重力多体問題のためのアーマド・コーエン型エルミート積分公式について

  1992, 44


• ON A HERMITE INTEGRATOR WITH AHMAD-COHEN SCHEME FOR GRAVITATIONAL MANY-BODY PROBLEMS

  J MAKINO, SJ AARSETH

  1992, PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN, 44(2) (2), 141 - 151, English

  Scientific journal


• ON A HERMITE INTEGRATOR WITH AHMAD-COHEN SCHEME FOR GRAVITATIONAL MANY-BODY PROBLEMS

  J MAKINO, SJ AARSETH

  1992, PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN, 44(2) (2), 141 - 151, English

  Scientific journal


• RAPID ORBITAL DECAY OF A BLACK-HOLE BINARY IN MERGING GALAXIES

  T FUKUSHIGE, T EBISUZAKI, J MAKINO

  1992, PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN, 44(3) (3), 281 - 289, English

  Scientific journal


• ENERGY SEGREGATION THROUGH VIOLENT RELAXATION

  Y FUNATO, J MAKINO, T EBISUZAKI

  1992, PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN, 44(3) (3), 291 - 301, English

  Scientific journal


• ON CORE COLLAPSE

  J MAKINO, P HUT

  Dec. 1991, ASTROPHYSICAL JOURNAL, 383(1) (1), 181 - 191, English

  [Refereed]

  Scientific journal


• MERGER OF BINARY GLOBULAR-CLUSTERS - CASE OF UNEQUAL MASSES

  J MAKINO, K AKIYAMA, D SUGIMOTO

  Nov. 1991, ASTROPHYSICS AND SPACE SCIENCE, 185(1) (1), 63 - 78, English

  [Refereed]

  Scientific journal


• MERGING OF 2 GALAXIES WITH CENTRAL BLACK-HOLES

  T EBISUZAKI, J MAKINO, SK OKUMURA

  Nov. 1991, NATURE, 354(6350) (6350), 212 - 214, English

  Scientific journal


• STAR CLUSTER EVOLUTION WITH PRIMORDIAL BINARIES .2. DETAILED ANALYSIS

  S MCMILLAN, P HUT, J MAKINO

  May 1991, ASTROPHYSICAL JOURNAL, 372(1) (1), 111 - 124, English

  [Refereed]

  Scientific journal


• A SPECIAL-PURPOSE COMPUTER FOR GRAVITATIONAL MANY-BODY PROBLEMS AND MERGER SIMULATIONS

  SK OKUMURA, T EBISUZAKI, J MAKINO, D SUGIMOTO, T ITO, K KODAIRA

  1991, IAU SYMPOSIA, (146) (146), 356 - 356, English

  [Refereed]

  Scientific journal


• SPECIAL PURPOSE COMPUTER FOR N-BODY PROBLEMS

  D SUGIMOTO, T EBISUZAKI, T ITO, J MAKINO

  1991, IAU SYMPOSIA, (148) (148), 489 - 490, English

  [Refereed]

  Scientific journal


• A SPECIAL-PURPOSE COMPUTER FOR GRAVITATIONAL MANY-BODY SYSTEMS - GRAPE-2

  T ITO, T EBISUZAKI, J MAKINO, D SUGIMOTO

  1991, PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN, 43(3) (3), 547 - 555, English

  [Refereed]

  Scientific journal


• A SPECIAL-PURPOSE COMPUTER FOR GRAVITATIONAL MANY-BODY PROBLEMS AND MERGER SIMULATIONS

  SK OKUMURA, T EBISUZAKI, J MAKINO, D SUGIMOTO, T ITO, K KODAIRA

  1991, DYNAMICS OF GALAXIES AND THEIR MOLECULAR CLOUD DISTRIBUTIONS, 146, 356 - 356, English

  [Refereed]

  International conference proceedings


• SPECIAL PURPOSE COMPUTER FOR N-BODY PROBLEMS

  D SUGIMOTO, T EBISUZAKI, T ITO, J MAKINO

  1991, MAGELLANIC CLOUDS, 148, 489 - 490, English

  [Refereed]

  International conference proceedings


• DYNAMIC EVOLUTION OF BINARY CLUSTERS AND COLLIDING GALAXIES

  D SUGIMOTO, T EBISUZAKI, J MAKINO

  1991, IAU SYMPOSIA, (148) (148), 217 - 218, English

  [Refereed]

  Scientific journal


• DYNAMIC EVOLUTION OF BINARY CLUSTERS AND COLLIDING GALAXIES

  D SUGIMOTO, T EBISUZAKI, J MAKINO

  1991, MAGELLANIC CLOUDS, 148, 217 - 218, English

  [Refereed]

  International conference proceedings


• DYNAMIC EVOLUTION OF COMPACT-GROUPS OF GALAXIES

  K KODAIRA, S OKUMURA, J MAKINO, T EBISUZAKI, D SUGIMOTO

  1991, PRIMORDIAL NUCLEOSYNTHESIS AND EVOLUTION OF EARLY UNIVERSE, 169, 393 - 401, English

  [Refereed]

  International conference proceedings


• GRAPE-1A - SPECIAL-PURPOSE COMPUTER FOR N-BODY SIMULATION WITH A TREE CODE

  T FUKUSHIGE, T ITO, J MAKINO, T EBISUZAKI, D SUGIMOTO, M UMEMURA

  1991, PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN, 43(6) (6), 841 - 858, English

  [Refereed]

  Scientific journal


• 中心ブラックホールをもつ銀河の合体

  1991, 352


• アーセス型N体時間積分のための最適次数と時間刻み

  1991, 369


• Optimal order and timestep criterion for Aarseth-type N-body integraters

  1991, The Astrophysical Journal, 369


• TREECODE WITH A SPECIAL-PURPOSE PROCESSOR

  J MAKINO

  1991, PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN, 43(4) (4), 621 - 638, English

  Scientific journal


• DREAM - A SPECIAL-PURPOSE COMPUTER FOR LARGE-SCALE MESH CALCULATIONS

  J MAKINO, T EBISUZAKI, SK OKUMURA

  1991, PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN, 43(4) (4), 639 - 648, English

  Scientific journal


• KINEMATIC STRUCTURES OF MERGER REMNANTS

  SK OKUMURA, T EBISUZAKI, J MAKINO

  1991, PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN, 43(6) (6), 781 - 793, English

  Scientific journal


• A MODIFIED AARSETH CODE FOR GRAPE AND VECTOR PROCESSORS

  J MAKINO

  1991, PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN, 43(6) (6), 859 - 876, English

  Scientific journal


• BOTTLENECKS IN SIMULATIONS OF DENSE STELLAR-SYSTEMS

  J MAKINO, P HUT

  Dec. 1990, ASTROPHYSICAL JOURNAL, 365(1) (1), 208 - 218, English

  [Refereed]

  Scientific journal


• STAR CLUSTER EVOLUTION WITH PRIMORDIAL BINARIES .1. A COMPARATIVE-STUDY

  S MCMILLAN, P HUT, J MAKINO

  Oct. 1990, ASTROPHYSICAL JOURNAL, 362(2) (2), 522 - 537, English

  [Refereed]

  Scientific journal


• A SPECIAL-PURPOSE N-BODY MACHINE GRAPE-1

  T ITO, J MAKINO, T EBISUZAKI, D SUGIMOTO

  Sep. 1990, COMPUTER PHYSICS COMMUNICATIONS, 60(2) (2), 187 - 194, English

  Scientific journal


• A SPECIAL-PURPOSE COMPUTER FOR GRAVITATIONAL MANY-BODY PROBLEMS

  D SUGIMOTO, Y CHIKADA, J MAKINO, T ITO, T EBISUZAKI, M UMEMURA

  May 1990, NATURE, 345(6270) (6270), 33 - 35, English

  Scientific journal


• GRAPE - A SPECIAL-PURPOSE COMPUTER FOR N-BODY PROBLEMS

  J MAKINO, T ITO, T EBISUZAKI, D SUGIMOTO

  1990, PROCEEDINGS OF THE INTERNATIONAL CONF ON APPLICATION SPECIFIC ARRAY PROCESSORS, 180 - 189, English

  [Refereed]

  International conference proceedings


• N体計算専用マシンGRAPE-1の誤差解析

  1990, 42


• N体計算専用マシン GRAPE-1

  1990, 60


• ON THE APPARENT UNIVERSALITY OF THE R1/4 LAW FOR BRIGHTNESS DISTRIBUTION IN GALAXIES

  J MAKINO, K AKIYAMA, D SUGIMOTO

  1990, PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN, 42(2) (2), 205 - 215, English

  Scientific journal


• ERROR ANALYSIS OF THE GRAPE-1 SPECIAL-PURPOSE N-BODY MACHINE

  J MAKINO, T ITO, T EBISUZAKI

  1990, PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN, 42(5) (5), 717 - 736, English

  Scientific journal


• SYNCHRONIZATION INSTABILITY AND MERGING OF BINARY GLOBULAR-CLUSTERS

  D SUGIMOTO, J MAKINO

  1989, PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN, 41(6) (6), 1117 - 1144, English

  Scientific journal


• PERFORMANCE ANALYSIS OF DIRECT N-BODY CALCULATIONS

  J MAKINO, P HUT

  Dec. 1988, ASTROPHYSICAL JOURNAL SUPPLEMENT SERIES, 68(4) (4), 833 - 856, English

  Scientific journal


• MODELING THE EVOLUTION OF GLOBULAR STAR-CLUSTERS

  P HUT, J MAKINO, S MCMILLAN

  Nov. 1988, NATURE, 336(6194) (6194), 31 - 35, English


• Galaxies in the connection machine

  Junichiro Makino, Piet Hut

  Kluwer Academic Publishers, Mar. 1988, Celestial Mechanics, 45(1-3) (1-3), 141 - 147, English

  [Refereed]

  Scientific journal


• GALAXIES IN THE CONNECTION MACHINE

  Junichiro Makino, Piet Hut

  Mar. 1988, CELESTIAL MECHANICS & DYNAMICAL ASTRONOMY, 45(1-3) (1-3), 141 - 147, English

  [Refereed]

  Scientific journal


• 直接N体計算の性能分析

  1988, 68


• EFFECT OF SUPRATHERMAL PARTICLES ON GRAVOTHERMAL OSCILLATION

  J MAKINO, D SUGIMOTO

  1987, PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN, 39(4) (4), 589 - 603, English

  Scientific journal


• Simple analytical solution for multiplicative nonlinear stochastic differential equations by a perturbation technique

  Akio Morita, Junichiro Makino

  1986, Physical Review A, 34(2) (2), 1595 - 1598, English

  [Refereed]

  Scientific journal


• GRAVOTHERMAL OSCILLATION IN GRAVITATIONAL MANY-BODY SYSTEMS

  J MAKINO, J TANEKUSA, D SUGIMOTO

  1986, PUBLICATIONS OF THE ASTRONOMICAL SOCIETY OF JAPAN, 38(6) (6), 865 - 877, English

  Scientific journal


• 24.確率的Verhulst方程式による人口増加のダイナミクスの再考察(パターン形成,運動と統計,研究会報告)

  牧野 淳一郎

  この論文は国立情報学研究所の電子図書館事業により電子化されました。研究会報告

  物性研究刊行会, 1985, 物性研究, 44(3) (3), 484 - 485, Japanese

• 3.11以後の科学リテラシー(no.146)

  牧野 淳一郎

  東京 : 岩波書店, Mar. 2025, 科学, 95(3) (3), 267 - 269, Japanese


• 3.11以後の科学リテラシー(no.145)

  牧野 淳一郎

  東京 : 岩波書店, Feb. 2025, 科学, 95(2) (2), 181 - 184, Japanese


• 3.11以後の科学リテラシー(no.144)

  牧野 淳一郎

  東京 : 岩波書店, Jan. 2025, 科学, 95(1) (1), 77 - 80, Japanese


• 3.11以後の科学リテラシー(no.143)

  牧野 淳一郎

  東京 : 岩波書店, Dec. 2024, 科学, 94(12) (12), 1115 - 1118, Japanese


• 3.11以後の科学リテラシー(no.142)

  牧野 淳一郎

  東京 : 岩波書店, Nov. 2024, 科学, 94(11) (11), 1018 - 1020, Japanese


• 国立感染症研究所が発表する「新型コロナ流行による超過死亡」解析の誤り

  本堂 毅, 牧野 淳一郎, 御手洗 聡, 森内 浩幸

  東京 : 日本医事新報社, 26 Oct. 2024, 日本医事新報, (5244) (5244), 54 - 57, Japanese


• 3.11以後の科学リテラシー(no.141)

  牧野 淳一郎

  東京 : 岩波書店, Oct. 2024, 科学, 94(10) (10), 908 - 911, Japanese


• 3.11以後の科学リテラシー(no.140)

  牧野 淳一郎

  東京 : 岩波書店, Sep. 2024, 科学, 94(9) (9), 846 - 848, Japanese


• 3.11以後の科学リテラシー(no.139)

  牧野 淳一郎

  東京 : 岩波書店, Aug. 2024, 科学, 94(8) (8), 745 - 747, Japanese


• 3.11以後の科学リテラシー(no.138)

  牧野 淳一郎

  東京 : 岩波書店, Jul. 2024, 科学, 94(7) (7), 604 - 606, Japanese


• 3.11以後の科学リテラシー(no.137)

  牧野 淳一郎

  東京 : 岩波書店, Jun. 2024, 科学, 94(6) (6), 564 - 566, Japanese


• 3.11以後の科学リテラシー(no.136)

  牧野 淳一郎

  東京 : 岩波書店, May 2024, 科学, 94(5) (5), 411 - 413, Japanese


• 3.11以後の科学リテラシー(no.135)

  牧野 淳一郎

  東京 : 岩波書店, Apr. 2024, 科学, 94(4) (4), 355 - 357, Japanese


• 3.11以後の科学リテラシー(no.134)

  牧野 淳一郎

  東京 : 岩波書店, Mar. 2024, 科学, 94(3) (3), 266 - 269, Japanese


• 3.11以後の科学リテラシー(no.133)

  牧野 淳一郎

  東京 : 岩波書店, Feb. 2024, 科学, 94(2) (2), 158 - 160, Japanese


• 3.11以後の科学リテラシー(no.132)

  牧野 淳一郎

  東京 : 岩波書店, Jan. 2024, 科学, 94(1) (1), 86 - 88, Japanese


• 3.11以後の科学リテラシー(no.131)

  牧野 淳一郎

  東京 : 岩波書店, Dec. 2023, 科学, 93(12) (12), 1062 - 1064, Japanese


• 3.11以後の科学リテラシー(no.130)

  牧野 淳一郎

  東京 : 岩波書店, Nov. 2023, 科学, 93(11) (11), 982 - 984, Japanese


• 3.11以後の科学リテラシー(no.129)

  牧野 淳一郎

  東京 : 岩波書店, Oct. 2023, 科学, 93(10) (10), 898 - 900, Japanese


• ポスト・ムーア時代のスパコン(4・最終回)効率的なアーキテクチャ(2)

  牧野 淳一郎

  東京 : 岩波書店, Oct. 2023, 科学, 93(10) (10), 901 - 904, Japanese


• 3.11以後の科学リテラシー(no.128)

  牧野 淳一郎

  東京 : 岩波書店, Sep. 2023, 科学, 93(9) (9), 810 - 812, Japanese


• ポスト・ムーア時代のスパコン(3)効率的なアーキテクチャ(1)

  牧野 淳一郎

  東京 : 岩波書店, Sep. 2023, 科学, 93(9) (9), 813 - 816, Japanese


• 3.11以後の科学リテラシー(no.127)

  牧野 淳一郎

  東京 : 岩波書店, Aug. 2023, 科学, 93(8) (8), 661 - 663, Japanese


• ポスト・ムーア時代のスパコン(2)演算性能の向上は限界に近づいているのか

  牧野 淳一郎

  東京 : 岩波書店, Aug. 2023, 科学, 93(8) (8), 732 - 735, Japanese


• ポスト・ムーア時代のスパコン(1)過去の計算機の性能向上

  牧野 淳一郎

  東京 : 岩波書店, Jul. 2023, 科学, 93(7) (7), 570 - 574, Japanese


• 3.11以後の科学リテラシー(no.126)

  牧野 淳一郎

  東京 : 岩波書店, Jul. 2023, 科学, 93(7) (7), 640 - 642, Japanese


• 3.11以後の科学リテラシー(no.125)

  牧野 淳一郎

  東京 : 岩波書店, Jun. 2023, 科学, 93(6) (6), 555 - 557, Japanese


• 3.11以後の科学リテラシー(no.124)

  牧野 淳一郎

  東京 : 岩波書店, May 2023, 科学, 93(5) (5), 467 - 470, Japanese


• 3.11以後の科学リテラシー(no.123)

  牧野 淳一郎

  東京 : 岩波書店, Apr. 2023, 科学, 93(4) (4), 301 - 303, Japanese


• 3.11以後の科学リテラシー(no.122)

  牧野 淳一郎

  東京 : 岩波書店, Mar. 2023, 科学, 93(3) (3), 275 - 278, Japanese


• 3.11以後の科学リテラシー(no.121)

  牧野 淳一郎

  東京 : 岩波書店, Feb. 2023, 科学, 93(2) (2), 182 - 184, Japanese


• 3.11以後の科学リテラシー(no.120)

  牧野 淳一郎

  東京 : 岩波書店, Jan. 2023, 科学, 93(1) (1), 78 - 81, Japanese


• 3.11以後の科学リテラシー(no.119)

  牧野 淳一郎

  東京 : 岩波書店, Dec. 2022, 科学, 92(12) (12), 1109 - 1112, Japanese


• 3.11以後の科学リテラシー(no.118)

  牧野 淳一郎

  東京 : 岩波書店, Nov. 2022, 科学, 92(11) (11), 1026 - 1029, Japanese


• 3.11以後の科学リテラシー(no.117)

  牧野 淳一郎

  東京 : 岩波書店, Oct. 2022, 科学, 92(10) (10), 941 - 944, Japanese


• 3.11以後の科学リテラシー(no.116)

  牧野 淳一郎

  東京 : 岩波書店, Sep. 2022, 科学, 92(9) (9), 854 - 856, Japanese


• 3.11以後の科学リテラシー(no.115)

  牧野 淳一郎

  東京 : 岩波書店, Aug. 2022, 科学, 92(8) (8), 762 - 765, Japanese


• 3.11以後の科学リテラシー(no.114)

  牧野 淳一郎

  東京 : 岩波書店, Jul. 2022, 科学, 92(7) (7), 666 - 668, Japanese


• 3.11以後の科学リテラシー(no.113)

  牧野 淳一郎

  東京 : 岩波書店, May 2022, 科学, 92(5) (5), 407 - 410, Japanese


• 3.11以後の科学リテラシー(no.112)—特集 原発事故と小児甲状腺がん

  Apr. 2022, 92(4) (4), 336 - 341, Japanese


• 3.11以後の科学リテラシー(no.111)

  Mar. 2022, 92(3) (3), 191 - 195, Japanese


• 3.11以後の科学リテラシー(no.110)

  牧野 淳一郎

  Feb. 2022, 92(2) (2), 159 - 162, Japanese


• 3.11以後の科学リテラシー(no.109)

  牧野 淳一郎

  Jan. 2022, 92(1) (1), 19 - 22, Japanese


• 3.11以後の科学リテラシー(no.108)

  牧野 淳一郎

  Dec. 2021, 91(12) (12), 1127 - 1131, Japanese


• 3.11以後の科学リテラシー(no.107)

  牧野 淳一郎

  岩波書店, Nov. 2021, 科学, 91(11) (11), 1034 - 1038, Japanese


• 3.11以後の科学リテラシー(no.106)

  牧野 淳一郎

  岩波書店, Oct. 2021, 科学, 91(10) (10), 946 - 949, Japanese


• 3.11以後の科学リテラシー(no.105)

  牧野 淳一郎

  岩波書店, Sep. 2021, 科学, 91(9) (9), 861 - 863, Japanese


• 3.11以後の科学リテラシー(no.104)

  牧野 淳一郎

  岩波書店, Aug. 2021, 科学, 91(8) (8), 807 - 811, Japanese


• 3.11以後の科学リテラシー(no.103)

  牧野 淳一郎

  岩波書店, Jul. 2021, 科学, 91(7) (7), 655 - 658, Japanese


• 3.11以後の科学リテラシー(no.102) (特集 被曝影響評価をめぐる問題群)

  牧野 淳一郎

  岩波書店, Jun. 2021, 科学, 91(6) (6), 592 - 594, Japanese


• 3.11以後の科学リテラシー(no.101)

  牧野 淳一郎

  岩波書店, May 2021, 科学, 91(5) (5), 497 - 500, Japanese


• 3.11以後の科学リテラシー(no.100)

  牧野 淳一郎

  岩波書店, Apr. 2021, 科学, 91(4) (4), 365 - 368, Japanese


• 3.11以後の科学リテラシー(no.99)

  牧野 淳一郎

  岩波書店, Mar. 2021, 科学, 91(3) (3), 249 - 252, Japanese


• 3.11以後の科学リテラシー(no.98)

  牧野 淳一郎

  岩波書店, Feb. 2021, 科学, 91(2) (2), 137 - 140, Japanese


• 銀河形成シミュレーションで探るrプロセス元素に富んだ星の動力学的性質

  平居悠, 青木和光, BEERS Timothy C., 千葉柾司, 斎藤貴之, 岡本崇, 牧野淳一郎, 牧野淳一郎

  2021, 日本天文学会年会講演予稿集, 2021


• ASURA-FDPSによる銀河形成シミュレーション:富岳向けチューニングの現状

  斎藤貴之, 行方大輔, 野村昴太郎, 岩澤全規, 平居悠, 岡本崇, 牧野淳一郎

  2021, 日本天文学会年会講演予稿集, 2021


• 深層学習を用いた超新星爆発によるシェル膨張の予測

  平島敬也, 森脇可奈, 藤井通子, 斎藤貴之, 牧野淳一郎

  2021, 日本天文学会年会講演予稿集, 2021


• 3.11以後の科学リテラシー(no.97)

  牧野 淳一郎

  岩波書店, Jan. 2021, 科学, 91(1) (1), 69 - 72, Japanese


• 富岳を使えば銀河形成の過程を忠実に再現できる (スパコン世界一「富岳」の正体(第2回))

  牧野 淳一郎

  中央公論新社, Dec. 2020, 中央公論, 134(12) (12), 155 - 159, Japanese


• 3.11以後の科学リテラシー(no.96)

  牧野 淳一郎

  岩波書店, Dec. 2020, 科学, 90(12) (12), 1094 - 1097, Japanese


• 3.11以後の科学リテラシー(no.95)

  牧野 淳一郎

  岩波書店, Nov. 2020, 科学, 90(11) (11), 974 - 977, Japanese


• 3.11以後の科学リテラシー(no.94) (特集 新型コロナウイルス感染症とコミュニケーション)

  牧野 淳一郎

  岩波書店, Oct. 2020, 科学, 90(10) (10), 923 - 927, Japanese


• 3.11以後の科学リテラシー(no.93)

  牧野 淳一郎

  岩波書店, Sep. 2020, 科学, 90(9) (9), 814 - 817, Japanese


• 3.11以後の科学リテラシー(no.92) (特集 複合災害下の問題群)

  牧野 淳一郎

  岩波書店, Aug. 2020, 科学, 90(8) (8), 696 - 698, Japanese


• 3.11以後の科学リテラシー(no.91)

  牧野 淳一郎

  岩波書店, Jul. 2020, 科学, 90(7) (7), 588 - 591, Japanese


• 3.11以後の科学リテラシー(no.90) (特集 新型コロナウイルス感染症と科学的助言)

  牧野 淳一郎

  岩波書店, Jun. 2020, 科学, 90(6) (6), 520 - 526, Japanese


• 3.11以後の科学リテラシー(no.89)

  牧野 淳一郎

  岩波書店, May 2020, 科学, 90(5) (5), 428 - 432, Japanese


• 3.11以後の科学リテラシー(no.88)

  牧野 淳一郎

  岩波書店, Apr. 2020, 科学, 90(4) (4), 305 - 309, Japanese


• 3.11以後の科学リテラシー(no.87)

  牧野 淳一郎

  岩波書店, Mar. 2020, 科学, 90(3) (3), 224 - 226, Japanese


• From "No Immediate Effect" to "No Relationship to Radiation Exposure" : Dose Evaluation and Science

  牧野 淳一郎

  日本学術協力財団, Mar. 2020, 学術の動向 = Trends in the sciences, 25(3) (3), 60 - 64, Japanese


• 3.11以後の科学リテラシー(no.86)

  牧野 淳一郎

  岩波書店, Feb. 2020, 科学, 90(2) (2), 177 - 179, Japanese


• Introduction to Auto-Generator Tool of Massive Parallel Simulation Code

  野村 昴太郎, 沼田 龍介, 八柳 祐一, 行方 大輔, 岩澤 全規, 牧野 淳一郎

  プラズマ・核融合学会編集委員会, Feb. 2020, プラズマ・核融合学会誌 = Journal of plasma and fusion research, 96(2) (2), 57 - 64, Japanese


• 3.11以後の科学リテラシー(no.85)

  牧野 淳一郎

  岩波書店, Jan. 2020, 科学, 90(1) (1), 73 - 75, Japanese


• 3.11以後の科学リテラシー(no.84)

  牧野 淳一郎

  岩波書店, Dec. 2019, 科学, 89(12) (12), 1087 - 1090, Japanese


• 3.11以後の科学リテラシー(no.83)

  牧野 淳一郎

  岩波書店, Nov. 2019, 科学, 89(11) (11), 962 - 965, Japanese


• 3.11以後の科学リテラシー(no.82)

  牧野 淳一郎

  岩波書店, Oct. 2019, 科学, 89(10) (10), 884 - 886, Japanese


• 3.11以後の科学リテラシー(no.81)

  牧野 淳一郎

  岩波書店, Sep. 2019, 科学, 89(9) (9), 790 - 795, Japanese


• 3.11以後の科学リテラシー(no.80)

  牧野 淳一郎

  岩波書店, Aug. 2019, 科学, 89(8) (8), 687 - 692, Japanese


• 3.11以後の科学リテラシー(no.79)

  牧野 淳一郎

  岩波書店, Jul. 2019, 科学, 89(7) (7), 656 - 659, Japanese


• 3.11以後の科学リテラシー(no.78)

  牧野 淳一郎

  岩波書店, Jun. 2019, 科学, 89(6) (6), 559 - 562, Japanese


• 3.11以後の科学リテラシー(no.77)

  牧野 淳一郎

  岩波書店, May 2019, 科学, 89(5) (5), 431 - 435, Japanese


• 3.11以後の科学リテラシー(no.76)

  牧野 淳一郎

  岩波書店, Apr. 2019, 科学, 89(4) (4), 360 - 364, Japanese


• 3.11以後の科学リテラシー(no.75)

  牧野 淳一郎

  岩波書店, Mar. 2019, 科学, 89(3) (3), 266 - 269, Japanese


• 3.11以後の科学リテラシー(no.74)

  牧野 淳一郎

  岩波書店, Feb. 2019, 科学, 89(2) (2), 171 - 173, Japanese


• 分子雲衝突による一様金属量を持つ星団の形成シミュレーション

  斎藤貴之, 平居悠, 藤井通子, 牧野淳一郎, 馬場淳一

  2019, 日本天文学会年会講演予稿集, 2019


• 3.11以後の科学リテラシー(no.73)

  牧野 淳一郎

  岩波書店, Jan. 2019, 科学, 89(1) (1), 22 - 24, Japanese


• 3.11以後の科学リテラシー(no.72)

  牧野 淳一郎

  岩波書店, Dec. 2018, 科学, 88(12) (12), 1182 - 1184, Japanese


• 3.11以後の科学リテラシー(no.71)

  牧野 淳一郎

  岩波書店, Nov. 2018, 科学, 88(11) (11), 1077 - 1080, Japanese


• 3.11以後の科学リテラシー(no.70)

  牧野 淳一郎

  岩波書店, Oct. 2018, 科学, 88(10) (10), 987 - 991, Japanese


• 3.11以後の科学リテラシー(no.69)

  牧野 淳一郎

  岩波書店, Sep. 2018, 科学, 88(9) (9), 879 - 882, Japanese


• 3.11以後の科学リテラシー(no.68)

  牧野 淳一郎

  岩波書店, Aug. 2018, 科学, 88(8) (8), 826 - 829, Japanese


• 3.11以後の科学リテラシー(no.67)

  牧野 淳一郎

  岩波書店, Jul. 2018, 科学, 88(7) (7), 704 - 707, Japanese


• 3.11以後の科学リテラシー(no.66)

  牧野 淳一郎

  岩波書店, Jun. 2018, 科学, 88(6) (6), 625 - 628, Japanese


• 3.11以後の科学リテラシー(no.65)

  牧野 淳一郎

  岩波書店, May 2018, 科学, 88(5) (5), 475 - 478, Japanese


• 3.11以後の科学リテラシー(no.64)

  牧野 淳一郎

  岩波書店, Apr. 2018, 科学, 88(4) (4), 354 - 358, Japanese


• 3.11以後の科学リテラシー(no.63) (特集 原発事故下の7年)

  牧野 淳一郎

  岩波書店, Mar. 2018, 科学, 88(3) (3), 291 - 293, Japanese


• 3.11以後の科学リテラシー(no.62)

  牧野 淳一郎

  岩波書店, Feb. 2018, 科学, 88(2) (2), 131 - 133, Japanese


• New method of gravitational-wave detection using optical lattice clocks

  Shinkai Hisaaki, Tamagawa Toru, Noda Atsushi, Katori Hidetoshi, Makino Jun'ichiro, Ebisuzaki Toshikazu

  The Physical Society of Japan, 2018, Meeting Abstracts of the Physical Society of Japan, 73(0) (0), 477 - 477, Japanese


• 3.11以後の科学リテラシー(no.61)

  牧野 淳一郎

  岩波書店, Jan. 2018, 科学, 88(1) (1), 38 - 41, Japanese


• 光格子時計による重力波検出 (特集 重力波天文学の曙)

  玉川 徹, 真貝 寿明, 野田 篤司, 香取 秀俊, 牧野 淳一郎, 戎崎 俊一

  岩波書店, Dec. 2017, 科学, 87(12) (12), 1109 - 1113, Japanese


• 3.11以後の科学リテラシー(no.60)

  牧野 淳一郎

  岩波書店, Nov. 2017, 科学, 87(11) (11), 1006 - 1008, Japanese


• 3.11以後の科学リテラシー(no.59)

  牧野 淳一郎

  岩波書店, Oct. 2017, 科学, 87(10) (10), 976 - 978, Japanese


• 3.11以後の科学リテラシー(no.58)

  牧野 淳一郎

  岩波書店, Sep. 2017, 科学, 87(9) (9), 830 - 833, Japanese


• 3.11以後の科学リテラシー(no.57)

  牧野 淳一郎

  岩波書店, Aug. 2017, 科学, 87(8) (8), 709 - 711, Japanese


• 3.11以後の科学リテラシー(no.56) (特集 被曝影響と甲状腺がん)

  牧野 淳一郎

  岩波書店, Jul. 2017, 科学, 87(7) (7), 626 - 630, Japanese


• 3.11以後の科学リテラシー(no.55)

  牧野 淳一郎

  岩波書店, Jun. 2017, 科学, 87(6) (6), 575 - 577, Japanese


• 3.11以後の科学リテラシー(no.54)

  牧野 淳一郎

  岩波書店, May 2017, 科学, 87(5) (5), 443 - 445, Japanese


• 3.11以後の科学リテラシー(no.52)

  牧野 淳一郎

  岩波書店, Mar. 2017, 科学, 87(3) (3), 230 - 233, Japanese


• 3.11以後の科学リテラシー(no.51)

  牧野 淳一郎

  岩波書店, Feb. 2017, 科学, 87(2) (2), 121 - 123, Japanese


• Far UVフィードバックの銀河の形成と進化への影響

  斎藤貴之, 馬場淳一, 平居悠, 牧野淳一郎

  2017, 日本天文学会年会講演予稿集, 2017


• Preface

  Makino Junichiro

  The Japanese Society for Planetary Sciences, 2017, Planetary People - The Japanese Society for Planetary Sciences, 26(3) (3), 81 - 81, Japanese


• 3.11以後の科学リテラシー(no.50)

  牧野 淳一郎

  岩波書店, Jan. 2017, 科学, 87(1) (1), 19 - 23, Japanese


• 3.11以後の科学リテラシー(no.49)

  牧野 淳一郎

  岩波書店, Dec. 2016, 科学, 86(12) (12), 1260 - 1263, Japanese


• 3.11以後の科学リテラシー(no.48) (甲状腺検査データ分析)

  牧野 淳一郎

  岩波書店, Nov. 2016, 科学, 86(11) (11), 1087 - 1089, Japanese


• 3.11以後の科学リテラシー(no.47)

  牧野 淳一郎

  岩波書店, Oct. 2016, 科学, 86(10) (10), 998 - 1000, Japanese


• 3.11以後の科学リテラシー(no.46)

  牧野 淳一郎

  岩波書店, Sep. 2016, 科学, 86(9) (9), 891 - 898, Japanese


• 3.11以後の科学リテラシー(no.45) (特集 甲状腺がん172人の現実)

  牧野 淳一郎

  岩波書店, Aug. 2016, 科学, 86(8) (8), 806 - 809, Japanese


• 3.11以後の科学リテラシー(no.44)

  牧野 淳一郎

  岩波書店, Jul. 2016, 科学, 86(7) (7), 661 - 664, Japanese


• 3.11以後の科学リテラシー(no.43)

  牧野 淳一郎

  岩波書店, Jun. 2016, 科学, 86(6) (6), 622 - 626, Japanese


• 3.11以後の科学リテラシー(no.42)

  牧野 淳一郎

  岩波書店, Apr. 2016, 科学, 86(4) (4), 338 - 341, Japanese


• 3.11以後の科学リテラシー(no.41)

  牧野 淳一郎

  岩波書店, Mar. 2016, 科学, 86(3) (3), 235 - 238, Japanese


• 3.11以後の科学リテラシー(no.40)

  牧野 淳一郎

  岩波書店, Feb. 2016, 科学, 86(2) (2), 138 - 142, Japanese


• 慣性変化法によるマントルの熱対流シミュレーション

  竹山浩介, 斎藤貴之, 牧野淳一郎

  2016, 日本天文学会年会講演予稿集, 2016


• 惑星形成N体計算の大粒子数化に向けて:FDPSを用いたParticle-Particle Particle-Tree法の並列計算

  山川暁久, 牧野淳一郎, 斎藤貴之, 小南淳子, 竹山浩介

  2016, 日本地球惑星科学連合大会予稿集(Web), 2016


• SPH法における,人工粘性とそのスイッチ,微分演算子の離散化に関するテスト

  細野七月, 斎藤貴之, 牧野淳一郎, 牧野淳一郎

  2016, 日本地球惑星科学連合大会予稿集(Web), 2016


• 対談 放射能汚染と被ばくの影響、子どもたちにどう伝える? (特集 東日本大震災と原発事故から5年)

  牧野 淳一郎, 山口 幸夫

  アドバンテージサーバー, 2016, 教育と文化 : 季刊フォーラム, (82) (82), 64 - 75, Japanese


• 3.11以後の科学リテラシー(no.39)

  牧野 淳一郎

  岩波書店, Jan. 2016, 科学, 86(1) (1), 28 - 32, Japanese


• 3.11以後の科学リテラシー(no.38)

  牧野 淳一郎

  岩波書店, Dec. 2015, 科学, 85(12) (12), 1186 - 1190, Japanese


• 3.11以後の科学リテラシー(no.37)

  牧野 淳一郎

  岩波書店, Nov. 2015, 科学, 85(11) (11), 1110 - 1113, Japanese


• 3.11以後の科学リテラシー(no.36)

  牧野 淳一郎

  岩波書店, Oct. 2015, 科学, 85(10) (10), 937 - 941, Japanese


• 3.11以後の科学リテラシー(no.35)

  牧野 淳一郎

  岩波書店, Sep. 2015, 科学, 85(9) (9), 848 - 851, Japanese


• 3.11以後の科学リテラシー(no.34)

  牧野 淳一郎

  岩波書店, Aug. 2015, 科学, 85(8) (8), 793 - 795, Japanese


• 3.11以後の科学リテラシー(no.33)

  牧野 淳一郎

  岩波書店, Jul. 2015, 科学, 85(7) (7), 664 - 666, Japanese


• 3.11以後の科学リテラシー(no.32) (特集 人間の論理・自然の摂理) -- (川内原発決定書の論理)

  牧野 淳一郎

  岩波書店, Jun. 2015, 科学, 85(6) (6), 563 - 567, Japanese


• 3.11以後の科学リテラシー(no.31)

  牧野 淳一郎

  岩波書店, May 2015, 科学, 85(5) (5), 454 - 457, Japanese


• 3.11以後の科学リテラシー(no.30)

  牧野 淳一郎

  岩波書店, Apr. 2015, 科学, 85(4) (4), 374 - 378, Japanese


• 3.11以後の科学リテラシー(no.29)

  牧野 淳一郎

  岩波書店, Mar. 2015, 科学, 85(3) (3), 254 - 258, Japanese


• 3.11以後の科学リテラシー(no.28)

  牧野 淳一郎

  岩波書店, Feb. 2015, 科学, 85(2) (2), 133 - 136, Japanese


• 慣性変化法によるマントルの熱対流シミュレーション

  竹山浩介, 斎藤貴之, 牧野淳一郎

  2015, 日本地球惑星科学連合大会予稿集(Web), 2015


• 3.11以後の科学リテラシー(no.27)

  牧野 淳一郎

  岩波書店, Jan. 2015, 科学, 85(1) (1), 33 - 38, Japanese


• 「林忠四郎の全仕事」, 佐藤文隆編, 京都大学学術出版会, 2014年5月刊行, 全816ページ, 定価15,120円, ISBN:9784876984978

  牧野 淳一郎

  日本惑星科学会, 25 Dec. 2014, 遊・星・人 : 日本惑星科学会誌, 23(4) (4), 400 - 400, Japanese


• 3.11以後の科学リテラシー(no.26)

  牧野 淳一郎

  岩波書店, Dec. 2014, 科学, 84(12) (12), 1204 - 1207, Japanese


• 3.11以後の科学リテラシー(no.25)

  牧野 淳一郎

  岩波書店, Nov. 2014, 科学, 84(11) (11), 1147 - 1151, Japanese


• 3.11以後の科学リテラシー(no.24)

  牧野 淳一郎

  岩波書店, Oct. 2014, 科学, 84(10) (10), 1022 - 1026, Japanese


• GRAPE9-MPX : A development of an accelerator dedicated for arbitrary-precision arithmetic by the FPGA boards

  MOTOKI Shinji, DAISAKA Hiroshi, NAKASATO Naohito, ISHIKAWA Tadashi, YUASA Fukuko, FUKUSHIGE Toshiyuki, KAWAI Atsushi, MAKINO Jun'ichiro

  Higher order corrections in perturbative quantum field theory are required for precise theoretical analysis to investigate the new physics. Feynman loop diagrams which appear in the calculation of the corrections are taken into account, leading to the evaluation of loop integrals. We developed GRAPE9-MPX system consisting of multiple FPGA boards to accelerate parallel computation of loop integrals. In the system, we implemented Processor Elements (PE) to realize quadruple/hexuple-precision arithmetics in FPGA. The theoretical perk speed in the current implementation is about 6.6 Gflops (quadruple-precision) and 3.2 Gflops (hexuple-precision). With the compiler we are developing, the program code is generated automatically with only inserting directives in C/C++ code. We present performance results for the case of Feynman two-loop integrals with quadruple precision and achieve the effective performance of 2.4Gflops for 1 board, 4.7Gflops for 2 boards, and 9.1Gflops for 4 boards, respectively.

  The Institute of Electronics, Information and Communication Engineers, 18 Sep. 2014, IEICE technical report, 114(223) (223), 69 - 74, Japanese


• O5-05 任意の不連続面に対応可能なSPH法の開発(口頭発表セッション5 惑星形成III,口頭発表)

  山本 智子, 斎藤 貴之, 牧野 淳一郎

  日本惑星科学会, 10 Sep. 2014, 日本惑星科学会秋期講演会予稿集, 2014, "O5 - 05", Japanese


• 3.11以後の科学リテラシー(no.23)

  牧野 淳一郎

  岩波書店, Sep. 2014, 科学, 84(9) (9), 914 - 917, Japanese


• 3.11以後の科学リテラシー(no.22)

  牧野 淳一郎

  岩波書店, Aug. 2014, 科学, 84(8) (8), 826 - 832, Japanese


• 3.11以後の科学リテラシー(no.21)

  牧野 淳一郎

  岩波書店, Jul. 2014, 科学, 84(7) (7), 715 - 718, Japanese


• 3.11以後の科学リテラシー(no.20)

  牧野 淳一郎

  岩波書店, Jun. 2014, 科学, 84(6) (6), 608 - 612, Japanese


• 3.11以後の科学リテラシー(no.19)

  牧野 淳一郎

  岩波書店, May 2014, 科学, 84(5) (5), 500 - 503, Japanese


• 3.11以後の科学リテラシー(no.18)

  牧野 淳一郎

  岩波書店, Apr. 2014, 科学, 84(4) (4), 399 - 403, Japanese


• Symposium on Computational Planetary Science

  Hayashi Y, Umeda T, Umemura M, Ogawa M, Kameyama M

  The Japanese Society for Planetary Sciences, Mar. 2014, Planetary People, 23(1) (1), 64 - 69, Japanese


• 3.11以後の科学リテラシー(no.17)

  牧野 淳一郎

  岩波書店, Mar. 2014, 科学, 84(3) (3), 263 - 267, Japanese


• 3.11以後の科学リテラシー(no.16)

  牧野 淳一郎

  岩波書店, Feb. 2014, 科学, 84(2) (2), 141 - 146, Japanese


• 微分可能かつ正値な擬密度を用いたSPH法の開発

  山本智子, 斎藤貴之, 牧野淳一郎

  2014, 日本天文学会年会講演予稿集, 2014


• DISPH法によるサンタバーバラクラスターのエントロピーコア形成

  斎藤貴之, 牧野淳一郎

  2014, 日本天文学会年会講演予稿集, 2014


• 慣性変化法によるマントルの熱対流シミュレーション

  竹山浩介, 斎藤貴之, 牧野淳一郎

  2014, 日本天文学会年会講演予稿集, 2014


• 3.11以後の科学リテラシー(no.15)

  牧野 淳一郎

  岩波書店, Jan. 2014, 科学, 84(1) (1), 109 - 113, Japanese


• 3.11以後の科学リテラシー(no.14)

  牧野 淳一郎

  岩波書店, Dec. 2013, 科学, 83(12) (12), 1340 - 1345, Japanese


• O4-03 Density Independent Smoothed Particle Hydrodynamicsの非理想気体への拡張(口頭発表セッション4(惑星形成),口頭発表)

  細野 七月, 斎藤 貴之, 牧野 淳一郎

  日本惑星科学会, 20 Nov. 2013, 日本惑星科学会秋期講演会予稿集, 2013, "O4 - 03", Japanese


• P1-22 物理量の連続性を仮定しないSPH法の開発(ポスターセッション1,ポスター発表)

  山本 智子, 斎藤 貴之, 牧野 淳一郎

  日本惑星科学会, 20 Nov. 2013, 日本惑星科学会秋期講演会予稿集, 2013, "P1 - 22", Japanese


• P1-21 Density Independent Smoothed Particle Hydrodynamicsによる巨大衝突シミュレーション(ポスターセッション1,ポスター発表)

  細野 七月, 斎藤 貴之, 牧野 淳一郎

  日本惑星科学会, 20 Nov. 2013, 日本惑星科学会秋期講演会予稿集, 2013, "P1 - 21", Japanese


• The use of simulations and predictions : In relation to the accident of Fukushima-Daiichi nuclear power plant

  牧野 淳一郎

  岩波書店, Nov. 2013, 科学, 83(11) (11), 1270 - 1274, Japanese


• 3.11以後の科学リテラシー(no.13)

  牧野 淳一郎

  岩波書店, Oct. 2013, 科学, 83(10) (10), 1092 - 1094, Japanese


• 3.11以後の科学リテラシー(no.12)

  牧野 淳一郎

  岩波書店, Sep. 2013, 科学, 83(9) (9), 967 - 972, Japanese


• 3.11以後の科学リテラシー(no.11)

  牧野 淳一郎

  岩波書店, Aug. 2013, 科学, 83(8) (8), 870 - 875, Japanese


• 大規模SIMD型アクセラレータの検討

  児玉祐悦, 山口佳樹, 中里直人, 牧野淳一郎, 朴泰祐, 佐藤三久

  将来のアクセラレータとして有望な大規模 SIMD 型プロセッサについて、検討を行っている。そのアーキテクチャの基本設計方針や、性能パラメータの検討結果を示すとともに、より詳細な評価を行うために、検討のたたき台としてのアーキテクチャの設計を行った。そのアーキテクチャを紹介するとともに、そのアーキテクチャに基づくサイクルベースシミュレータを作成して、いくつかのベンチマークを用いて性能見積もりを行った。また、今後の評価の方針や検討課題について考察する。

  一般社団法人情報処理学会, 24 Jul. 2013, 研究報告ハイパフォーマンスコンピューティング（HPC）, 2013(38) (38), 1 - 8, Japanese


• 3.11以後の科学リテラシー(no.10)

  牧野 淳一郎

  岩波書店, Jul. 2013, 科学, 83(7) (7), 730 - 734, Japanese


• 3.11以後の科学リテラシー(no.09)

  牧野 淳一郎

  岩波書店, Jun. 2013, 科学, 83(6) (6), 611 - 614, Japanese


• 3.11以後の科学リテラシー(no.08)

  牧野 淳一郎

  岩波書店, May 2013, 科学, 83(5) (5), 493 - 496, Japanese


• 3.11以後の科学リテラシー(no.07)

  牧野 淳一郎

  岩波書店, Apr. 2013, 科学, 83(4) (4), 379 - 386, Japanese


• 3.11以後の科学リテラシー(no.06)

  牧野 淳一郎

  岩波書店, Mar. 2013, 科学, 83(3) (3), 261 - 267, Japanese


• 三地球質量ガス雲G2の近点通過によるフレア現象について

  斎藤貴之, 牧野淳一郎, 朝木義晴, 馬場淳一, 小麦真也, 三好真, 長尾透, 高橋真聡, 武田隆顕, 坪井昌人, 若松謙一

  20 Feb. 2013, 日本天文学会年会講演予稿集, 2013, 70, Japanese


• 3.11以後の科学リテラシー(no.05)

  牧野 淳一郎

  岩波書店, Feb. 2013, 科学, 83(2) (2), 153 - 157, Japanese


• The Origin of Matter and the Universe

  MAKINO Junichiro

  日本計算工学会, 31 Jan. 2013, 計算工学, 18(1) (1), 2897 - 2900, Japanese


• 非理想気体も扱えるDensity Independent Smoothed Particle Hydrodynamicsの開発

  細野七月, 斎藤貴之, 牧野淳一郎, 牧野淳一郎

  2013, 日本天文学会年会講演予稿集, 2013


• 幾何学的体積を用いたSPH法の開発

  山本智子, 斎藤貴之, 牧野淳一郎

  2013, 日本天文学会年会講演予稿集, 2013


• Density Independent Formulation of SPH

  斎藤貴之, 牧野淳一郎

  2013, 日本天文学会年会講演予稿集, 2013


• 3.11以後の科学リテラシー(no.04)

  牧野 淳一郎

  岩波書店, Jan. 2013, 科学, 83(1) (1), 29 - 32, Japanese


• 3.11以後の科学リテラシー(no.03)

  牧野 淳一郎

  岩波書店, Dec. 2012, 科学, 82(12) (12), 1291 - 1294, Japanese


• 3.11以後の科学リテラシー(no.02)

  牧野 淳一郎

  岩波書店, Nov. 2012, 科学, 82(11) (11), 1188 - 1191, Japanese


• 専用計算機GRAPEと計算物理 (特集 GRAPEによる計算物理)

  牧野 淳一郎

  丸善, Oct. 2012, パリティ, 27(10) (10), 4 - 9, Japanese


• 国策プロジェクトとしてのスパコン開発

  牧野 淳一郎

  岩波書店, Sep. 2012, 科学, 82(9) (9), 965 - 972, Japanese


• 座談会 消えた論理の謎 : 原発事故後の言葉の融解 (特集 科学の<限界> : 価値の選択と予測)

  押川 正毅, 影浦 峡, 牧野 淳一郎

  岩波書店, Mar. 2012, 科学, 82(3) (3), 285 - 293, Japanese


• 畑村委員会中間報告に書かれていないこと (2011大震災)

  牧野 淳一郎

  岩波書店, Feb. 2012, 科学, 82(2) (2), 149 - 153, Japanese


• 超高光度赤外線銀河の複数個コアの起源

  松井秀徳, 斎藤貴之, 牧野淳一郎, 和田桂一, 富阪幸治, 小久保英一郎, 台坂博, 岡本崇, 吉田直紀

  2012, 日本天文学会年会講演予稿集, 2012


• 座談会 原発事故後の"日本的対応"をよむ (特集 科学は誰のためのものか--原発事故後の科学と社会)

  押川 正毅, 藤垣 裕子, 牧野 淳一郎

  岩波書店, Sep. 2011, 科学, 81(9) (9), 881 - 886, Japanese


• Lectures for Science Teachers of Junior-high School supported by SPP (2)

  モリ, ヤスヒト, スダ, ジュンイチロウ, マキノ, カズナリ, ハラ, ヒサユキ, Yamakita, Hisae

  10 KJ00007544919 論文

  佐世保 : 国立高等専門学校機構佐世保工業高等専門学校, 11 Jan. 2011, RESEARCH REPORTS OF NATIONAL INSTITUTE OF TECHNOLOGY，SASEBO COLLEGE, 47, 55 - 64, Japanese


• 合体による星団の進化と中間質量ブラックホールの形成

  藤井通子, 藤井通子, 斎藤貴之, 牧野淳一郎, 岩澤全規, ZWART Simon F.Portegies

  2011, 日本天文学会年会講演予稿集, 2011


• 星団の階層的合体による形成・進化

  藤井通子, 藤井通子, 斎藤貴之, 牧野淳一郎, PORTEGIES ZWART Simon

  2011, 日本天文学会年会講演予稿集, 2011


• 渦状腕構造の維持機構

  馬場淳一, 藤井通子, 斎藤貴之, 牧野淳一郎, 和田桂一

  2010, 日本天文学会年会講演予稿集, 2010


• 銀河衝突合体におけるHyper Star Clusters形成と銀河中心への質量供給

  松井秀徳, 斎藤貴之, 小久保英一郎, 富阪幸治, 牧野淳一郎, 和田桂一, 台阪博, 岡本崇, 吉田直紀

  2010, 日本天文学会年会講演予稿集, 2010


• FAST:A Fully Asynchronous Split Time-integrator for Self-Gravitational Fluid

  斎藤貴之, 牧野淳一郎

  2010, 日本天文学会年会講演予稿集, 2010


• 強いショックをSPHで扱うための独立時間刻み法の改良

  斎藤貴之, 牧野淳一郎

  2010, 日本天文学会年会講演予稿集, 2010


• Gravitational N-body simulation and LU decomposition with the multi purpose accelerator GRAPE-DR

  小池邦昭, 藤野健, 福重俊幸, 台坂博, 菅原豊, 稲葉真理, 平木敬, 牧野淳一郎

  15 Oct. 2009, 情報処理学会研究報告(CD-ROM), 2009(3) (3), ROMBUNNO.ARC-184,26, Japanese


• 10aSK-7 Acceleration of the computation of loop integrals with GRAPE-DR

  Yuasa F, Ishikawa T, Makino J, Nakasato N, Hamaguchi N, Koike K

  The Physical Society of Japan (JPS), 18 Aug. 2009, Meeting abstracts of the Physical Society of Japan, 64(2) (2), 4 - 4, Japanese


• Gravitational N-body simulation and LU decomposition with the multi purpose accelerator GRAPE-DR

  小池邦昭, 藤野健, 福重俊幸, 台坂博, 菅原豊, 稲葉真理, 平木敬, 牧野淳一郎

  超並列準汎用計算機 GRAPE-DR は 1 チップに 512 個の演算要素を搭載した SIMD アクセラレータを PC に接続し，これを並列に接続したクラスタシステムである．これは従来の重力多体問題専用計算機 GRAPE の発展形として使用できるように構想されたものであるが，アクセラレータ部分が専用ハードウェアパイプラインではなくプログラム可能な演算器を搭載することでより広い応用が可能であることが大きな特徴である．本論文ではアクセラレータ部で動作する重力相互作用計算と行列積計算ルーチンを実装し，1 ノードでの性能評価をおこなった．現在それぞれのライブラリについて最適化を行っている．現状では重力相互作用計算では 362.6 GFlops (N = 262144)，行列積計算では 635.1GFlops (M = N = 32768，K = 2048) の演算性能となった．これを用いて High Performance LINPACK (HPL) の加速を行い，演算性能値は 284.3 GFlops (N = 34816，NB = 2048) となった．The multi purpose computer GRAPE-DR is a cluster of PCs computer with the custom-mad

  情報処理学会, 28 Jul. 2009, 研究報告計算機アーキテクチャ（ARC）, 2009(26) (26), 1 - 11, Japanese


• Fast Quad-Precision Operations On Many-core Accelerators

  中里 直人, 石川 正, 牧野 淳一郎, 湯浅 富久子

  本論文では，GRAPE-DRやGPU などのメニーコアアクセラレータにおける，四倍精度演算 (DD 演算) の性能評価について報告する．四倍精度相当の演算は倍精度演算器を利用することでエミュレーションすることができる．しかしそのためには DD 演算あたり 20-23 回の倍精度演算が必要であり，DD 演算の演算性能は，倍精度演算性能と比べると 20 分の 1 以下となる．また，通常の CPU では，利用できる論理レジスタが最大で 16 個であるため，DD 演算性能はさらに低下する．一方で，メニーコアアクセラレータをベクトル型演算器と考えると，実効的なレジスタ数が非常に多いため，ループアンローリングが効果的に働くことで，演算レイテンシを完全に隠蔽できる．我々は GRAPE-DR と GPU で DD 演算をおこなうための基本ライブラリとそれを利用するためのコンパイラを開発した．これにより，メニーコアアクセラレータでの DD 演算性能を調べた．結果，通常の CPU での DD 演算性能より 30 - 90 倍の高速

  情報処理学会, 28 Jul. 2009, 研究報告ハイパフォーマンスコンピューティング（HPC）, 2009(39) (39), 1 - 7, Japanese


• スーパーコンピューティングの将来

  牧野淳一郎

  2009


• VLBIによる銀河円盤観測の意義と精度

  三好真, 馬場淳一, 朝木義晴, 牧野淳一郎, 斎藤貴之, 和田桂一

  2009, 日本天文学会年会講演予稿集, 2009


• VLBIによる銀河の非円運動の観測結果

  朝木義晴, 馬場淳一, 牧野淳一郎, 三好真, 斎藤貴之, 和田桂一

  2009, 日本天文学会年会講演予稿集, 2009


• 渦巻き銀河の3次元N体/SPH計算

  馬場淳一, 和田桂一, 斎藤貴之, 牧野淳一郎

  2009, 日本天文学会年会講演予稿集, 2009


• ASURAによる様々な衝突パラメータを用いた渦巻き銀河衝突実験

  松井秀徳, 斎藤貴之, 和田桂一, 富阪幸治, 牧野淳一郎

  2009, 日本天文学会年会講演予稿集, 2009


• ASURAによる銀河シミュレーション

  斎藤貴之, 馬場淳一, 松井秀典, 小久保英一郎, 和田桂一, 牧野淳一郎, 富阪幸治, 台坂博, 吉田直紀, 岡本崇

  2009, 日本天文学会年会講演予稿集, 2009


• 銀河の非円運動-理論と観測

  牧野淳一郎, 馬場淳一, 朝木義晴, 三好真, 斎藤貴之, 和田桂一

  2009, 日本天文学会年会講演予稿集, 2009


• 銀河渦巻構造の維持発生機構の新理論

  和田桂一, 馬場淳一, 斎藤貴之, 牧野淳一郎

  2009, 日本天文学会年会講演予稿集, 2009


• 相互作用銀河における星団形成過程の解明

  斎藤貴之, 小久保英一郎, 和田桂一, 牧野淳一郎, 富阪幸治, 台坂博, 吉田直紀, 岡本崇

  2009, 日本天文学会年会講演予稿集, 2009


• 渦巻銀河における恒星渦状腕の動力学進化

  藤井通子, 藤井通子, 馬場淳一, 小久保英一郎, 斎藤貴之, 牧野淳一郎, 和田桂一, 台坂博

  2009, 日本天文学会年会講演予稿集, 2009


• ASURAによる様々な衝突パラメータを用いた渦巻き銀河衝突実験

  松井秀徳, 斎藤貴之, 小久保英一郎, 和田桂一, 牧野淳一郎, 富阪幸治, 台坂博, 吉田直紀, 岡本崇

  2009, 日本天文学会年会講演予稿集, 2009


• 331 微惑星円盤内での連星形成I等質量微惑星円盤(原始惑星系円盤II,オーラルセッション11)

  台坂 淳子, 牧野 淳一郎, 台坂 博

  日本惑星科学会, 01 Nov. 2008, 日本惑星科学会秋期講演会予稿集, 2008, 92 - 92, Japanese


• Prospects of Numerical Simulations in Astrophysics

  MATSUMOTO Ryoji, MAKINO Junichiro

  日本計算工学会, 31 Jan. 2008, Journal of the Japan Society for Computational Engineering and Science, 13(1) (1), 1746 - 1749, Japanese


• 相互作用銀河の初期遭遇時におけるスターバーストと星団形成

  斎藤貴之, 小久保英一郎, 和田桂一, 牧野淳一郎, 富阪幸治, 岡本崇, 台坂博, 吉田直紀

  2008, 日本天文学会年会講演予稿集, 2008


• High-Performance Small-Scale Simulation of Star Clusters Evolution on Cray XD1

  NITADORI KEIGO, MAKINO JUNICHIRO, ABE GEORGE

  In this paper, we describe the implimentation and performance of N-body simulation code for a star cluster with 64 k stars on a Cray XD1 system with 400 dual-core Opteron processors. There have been many reports on the parallelization of astrophysical N-body simulations. For parallel implementations on more than a few tens of processors, performance was usually measured for very large number of particles. For example, all previous entries for the Gordon-Bell prizes used at least 700k particles. The reason for this preference of large numbers of particles is the parallel efficiency. It is very difficult to achieve high performance on large parallel machines, if the number of particles is small. However, for many scientifically important problems the calculation cost scales as O(N^<3.3>), and it is very important to use large machines for relatively small number of particles. We achieved 2.03 Tflops, or 57.7% of the theoretical peak performance, using a direct O(N^2) calculation with the individual timestep algorithm, on 64k particles. The best efficiency previously reported on similar calculation with 64 K or smaller number of particles is 7.8% (9 Gflops) on Cray T3E-900 with 128 pr

  Information Processing Society of Japan (IPSJ), 15 May 2007, 情報処理学会論文誌コンピューティングシステム（ACS）, 48(8) (8), 54 - 61, Japanese


• Massive Black Holes at the Centers of Globular Clusters?

  牧野 淳一郎

  日本天文学会, 20 Jan. 2007, The Astronomical herald, 100(2) (2), 92 - 99, Japanese


• 2007年度の天の川創成プロジェクト

  斎藤貴之, 小久保英一郎, 和田桂一, 富阪幸治, 牧野淳一郎, 岡本崇, 台坂博, 吉田直紀

  2007, 日本天文学会年会講演予稿集, 2007


• 天の川創成プロジェクト零号機の開発 III コード開発

  斎藤貴之, 台坂博, 出田誠, 小久保英一郎, 和田桂一, 富阪幸治, 牧野淳一郎, 吉田直紀

  2006, 日本天文学会年会講演予稿集, 2006


• 天の川創成プロジェクト IV 壱号機の開発と性能報告

  斎藤貴之, 台坂博, 出田誠, 岡本崇, 小久保英一郎, 和田桂一, 富阪幸治, 牧野淳一郎, 吉田直紀

  2006, 日本天文学会年会講演予稿集, 2006


• AM06-19-011 Origin of the Milkyway

  SAITOH Takayuki, DAISAKA Hiroshi, IDETA Makoto, OKAMOTO Takashi, KOKUBO Eiichiro, WADA Keiichi, TOMISAKA Kohji, MAKINO Junichiro, YOSHIDA Naoki

  In this paper, we introduce Project "Origin of the Milkyway". This project aims at reliable modeling of the formation history of our Galaxy (i.e., the Milkyway), as a typical spiral galaxy, with the mass resolution 2-3 orders of magnitude higher than what has been achieved so far. In order to achieve such state-of-the-art simulations, we construct two beowulf type PC-clusters with GRAPE-6A/7, and we develop a new N-body/SPH code for parallel computing.

  日本流体力学会, 2006, 日本流体力学会年会講演論文集, 2006, 286 - 286, Japanese


• 講座 とんでる力学(12・最終回)剛体の運動(3)グライダーの3次元運動

  牧野 淳一郎

  丸善, Mar. 2005, パリティ, 20(3) (3), 56 - 61, Japanese


• 講座 とんでる力学(11)剛体の運動(2)グライダーの安定性

  牧野 淳一郎

  丸善, Feb. 2005, パリティ, 20(2) (2), 64 - 68, Japanese


• 天の川創成プロジェクト零号機の開発 II

  斎藤貴之, 台坂博, 出田誠, 小久保英一郎, 和田桂一, 富阪幸治, 牧野淳一郎, 吉田直紀

  2005, 日本天文学会年会講演予稿集, 2005


• 天の川実験装置零号機の開発

  台坂博, 斎藤貴之, 小久保英一郎, 和田桂一, 牧野淳一郎, 吉田直紀

  2005, 日本天文学会年会講演予稿集, 2005


• Origin of the Moon -- An essential condition for a large satellite --

  Wada Keiichi, Kokubo Eiichiro, Makino Junichiro

  In order to examine the ``giant impact hypothesis'' for the Moon formation, we run the first grid-based, high-resolution hydrodynamic simulations for impact between proto-Earth and a proto-planet. The spatial resolution for the impact-generated disk is greatly improved from previous particle-based simulations. This allows us to explore internal fine structures of the debris disk and its long-term evolution. We find that in order to form a stable debris disk from which a lunar-sized satellite can be accumulated, the impact must result in a disk of mostly liquid debris, where pressure is not effective, well before the accumulation process starts. If the debris is dominated by vapor gas, strong spiral shocks are generated, thereby the circumterrestrial disk cannot survive more than several days.

  THE JAPANESE SOCIETY FOR PLANETARY SCIENCES, 2005, Abstracts for fall meeting of the Japanese Society for Planetary Science, 2005(0) (0), 91 - 91


• 講座:とんでる力学(第10回)剛体の運動(1)グライダーが飛べるわけ

  牧野 淳一郎

  丸善, Jan. 2005, パリティ, 20(1) (1), 77 - 81, Japanese


• Information Technologies Support Astronomy:Milky Way Project

  WADA Keiichi, KOKUBO Eiichiro, TOMISAKA Kohji, DAISAKA Hiroshi, SAITOH Takayuki, MAKINO Junichiro, YOSHIDA Naoki

  大規模理論天文シミュレーションによる「天の川創成プロジェクト」とその背景にある銀河形成の問題について紹介します。プロジェクトでは、詳細な理論モデル、計算手法と高速の専用並列計算機を組み合わせ、宇宙初期から現在まで、銀河の形成・進化過程を高精度でシミュレーションすることにより、（1） 我々の銀河系＝天の川の3次元構造とその形成過程、および（2）銀河の形態の起源、を初めて明らかにすることを目指しています。第I 期計画では、次世代専用超並列計算機GRAPE-DRと高速ホスト計算機、高速ネットワークを組み合わせた計算能力1ペタフロップスの「天の川数値解析装置」を国立天文台内に構築し、現状の最大規模のシミュレーションの100倍規模のシミュレーションを行います。 これにより銀河形成問題にブレークスルーをもたらすことができるはずです。

  Information Processing Society of Japan (IPSJ), 15 Dec. 2004, IPSJ Magazine, 45(12) (12), 1225 - 1228, Japanese


• 講座:とんでる力学(第9回)人工衛星の打ち上げはなぜ大変?

  牧野 淳一郎

  丸善, Dec. 2004, パリティ, 19(12) (12), 66 - 70, Japanese


• 講座:とんでる力学(第8回)惑星の軌道(5)多体問題は解けない?

  牧野 淳一郎

  丸善, Nov. 2004, パリティ, 19(11) (11), 66 - 70, Japanese


• 講座:とんでる力学(第7回)惑星の軌道(4)2つの惑星

  牧野 淳一郎

  丸善, Oct. 2004, パリティ, 19(10) (10), 59 - 63, Japanese


• 講座 とんでる力学(6)惑星の軌道(3)周転円近似

  牧野 淳一郎

  丸善, Sep. 2004, パリティ, 19(9) (9), 57 - 61, Japanese


• Formation Mechanism of Binaries in the Edgeworth-Kuiper-belt (Current Topics)

  Funato Yoko, Makino Junichiro, Kokubo Eiichiro

  Recent observations have revealed an unexpectedly high binary fraction among the Edgeworth-Kuiper-belt objects (EKBOs). The discovered binaries are characteristic so that theories of binary asteroid formation ever known cannot explain the formation of EKBO binaries. Here we show a mechanism which naturally produces the EKBO-type binaries. Our theory implies that EKBOs were formed through gravitational instabilities of the protoplanetary dust layer.

  The Physical Society of Japan (JPS), 05 Aug. 2004, Butsuri, 59(8) (8), 537 - 540, Japanese


• 講座:とんでる力学(第5回)惑星の軌道(2)本当に楕円軌道?

  牧野 淳一郎

  丸善, Aug. 2004, パリティ, 19(8) (8), 48 - 52, Japanese


• 講座:とんでる力学(4)惑星の軌道(1)楕円軌道

  牧野 淳一郎

  丸善, Jul. 2004, パリティ, 19(7) (7), 61 - 64, Japanese


• 講座 とんでる力学(3)ボールの軌跡(3)"魔球"を実験する

  牧野 淳一郎

  丸善, Jun. 2004, パリティ, 19(6) (6), 57 - 61, Japanese


• 講座:とんでる力学(2)ボールの軌跡(2)空気抵抗

  牧野 淳一郎

  丸善, May 2004, パリティ, 19(5) (5), 53 - 57, Japanese


• 講座 とんでる力学(1)ボールの軌跡(1)自由落下

  牧野 淳一郎

  丸善, Apr. 2004, パリティ, 19(4) (4), 62 - 66, Japanese


• 天の川創成プロジェクト

  和田桂一, 富阪幸治, 小久保英一郎, 台坂博, 斎藤貴之, 牧野淳一郎, 吉田直紀

  2004, 日本天文学会年会講演予稿集, 2004


• Evolution of a Narrow Ring Confined by Shepherding Satellites

  Daisaka Hiroshi, Makino Junichiro

  本研究では、中心星ポテンシャルが歪んでいる事に起因する近点の差動回転のような破壊的効果の影響下で、天王星楕円リングのような楕円リングがどのように形成維持されるのかを議論する。

  THE JAPANESE SOCIETY FOR PLANETARY SCIENCES, 2004, Abstracts for fall meeting of the Japanese Society for Planetary Science, 2004(0) (0), 25 - 25


• Formation Mechanism of Binaries in the Edgeworth-Kuiper-belt

  Funato Yoko, Makino Junichiro, Kokubo Eiichiro

  Recent observations have revealed an unexpectedly high binary fraction among the Edgeworth-Kuiper-belt objects (EKBOs). The discovered binaries are characteristic so that theories of binary asteroid formation ever known cannot explain the formation of EKBO binaries. Here we show a mechanism which naturally produces the EKBO-type binaries. Our theory implies that EKBOs were formed through gravitational instabilities of the protoplanetary dust layer.

  The Physical Society of Japan, 2004, Butsuri, 59(8) (8), 537 - 540, Japanese


• Numerical studies of the Giant Impact Hypotthesis of forming Moon using high-resolution hydrodynamic simulations

  Wada Keiichi, Kokubo Eiichiro, Makino Junichiro

  月形成の「巨大衝突仮説」の拠り所の一つとなっているのが、SPH法を用いた一連の数値実験である。しかし、Cameron, Canupらの数値実験には、多くの点で問題がある。特に有効空間分解能が周地球円盤の半径程度しかないのは致命的である。今回、我々は高精度の３次元Euler-Meshコードを用いて、巨大衝突仮説の再検証を行った。その結果、周地球円盤から形成される月質量は数日で急激に減少するという問題点があることがわかった。

  THE JAPANESE SOCIETY FOR PLANETARY SCIENCES, 2004, Abstracts for fall meeting of the Japanese Society for Planetary Science, 2004(0) (0), 106 - 106


• S604 Large-scale Simulation on Special-purpose Computers : The GRAPE Project

  MAKINO Junichiro

  プラズマ・核融合学会, 2004, プラズマ・核融合学会年会予稿集, (21) (21), 37 - 37, Japanese


• HMCS - G : Grid - enabled Hybrid Computing System for Computational Astrophysics

  BOKU TAISUKE, SATO MITSUHISA, ONUMA KENJI, MAKINO JUNICHIRO, SUSA HAJIME, TAKAHASHI DAISUKE, UMEMURA MASAYUKI

  We have developed a hybrid computing system named HMCS-G which combines general purpose parallel systems and a special purpose machine for gravity calculation on computational grid environment. The prototype is implemented with GRAPE-6 gravity engine and OmniRPC as Grid-RPC with high portability and throughput. Through the preliminary performance evaluation on several network conditions, it is confirmed that the function and capability of HMCS-G can support actual application for multiphysics simulation. With HMCS-G, the utilization ratio of special purpose machines such as GRAPE-6 is also greatly enhanced through access from all over the world.

  Information Processing Society of Japan (IPSJ), 15 Aug. 2003, 情報処理学会論文誌コンピューティングシステム（ACS）, 44(11) (11), 1 - 13, Japanese


• 第3章 コンピュータにより可能になった新たな科学/工学分野 基礎からの計算科学・工学--シミュレーション (特集 動きのはやい技術動向をより効率的に理解するための用語解説 現代コンピュータ技術の基礎)

  菊池 誠, 牧野 淳一郎, 吉田 たけお

  CQ出版社, Aug. 2003, インタ-フェ-ス, 29(8) (8), 60 - 66, Japanese


• チャンドラ衛星によるスターバースト銀河NGC2146の観測研究

  松本浩典, 鶴剛, 松下聡樹, 川辺良平, 小林尚人, 舞原俊憲, 戎崎俊一, 牧野淳一郎, 野本憲一, 梅田秀之

  2003, 日本天文学会年会講演予稿集, 2003, 158, Japanese


• 研究ニュース

  平岡 秀一, 塩谷 光彦, 狩野 直和, 川島 隆幸, 川上 厚志, 牧野 淳一郎, 中村 栄一, 磯部 寛之, 尾中 敬, 岡 良隆, 上野 啓司, 島田 敏宏, 小間 篤, 東山 哲也, 濱口 宏夫, 清水 裕子

  金属イオンを自在に並べる／有機ケイ素化合物におけるケイ素の配位数の制御／小型熱帯魚ゼブラフィッシュの変異体を用いた遺伝子ハンティング／GRAPE-6とゴードン・ベル賞／フラーレンの基礎n学て妬くナノバイオテクノロジー／赤外線衛星観測と衛星冷却望遠鏡／やる気を起こさせる神経メカニズム／有機分子ナノ構造のシリコン基板上への自己組織化形成／植物の受精のしくみを解き明かす／酵母生細胞の時空間分解ラマン分光／マカク細胞の加齢に関する研究

  東京大学大学院理学系研究科・理学部, 17 Sep. 2002, 東京大学理学系研究科・理学部ニュース, 34(1) (1), 4 - 12, Japanese


• Space Radiative Transfer and Hydrodynamics Calculation with Self-gravity on Heterogeneous Multi-Computer System

  BOKU TAISUKE, MAKINO JUNICHIRO, SUSA HAJIME, UMEMURA MASAYUKI, FUKUSHIGE TOSHIYUKI, UKAWA AKIRA

  HMCS (Heterogeneous Multi-Computer System) is a new parallel processing platform combining massively parallel processors for continuum simulation and particle simulation to realize multi-scale computational physics simulations. We constructed a prototype system of HMGS with a general purpose scientific parallel processor OP-PAGS and a gravity calculation parallel processor GRAPE-6 connecting them via commodity-base parallel network. On the prototype of HMCS, a micro-scopic gravity calculation on GRAPE-6 and a macro-scopic radiative-transfer hydrodynamics calculation on GP-PACS are performed simultaneously to realize detailed simulation on computational astrophysics. Both systems are connected via parallel network controlling system named PIO (Parallel I/O System). On each time step, all data of particles are exchanged between two systems hiding communication latency with a special algorithm and buffering effect by PIO. In this paper, we describe the overall concept of HMGS, its application and system implementation, and the performance evaluation of a prototype system.

  Information Processing Society of Japan (IPSJ), 15 Sep. 2002, 情報処理学会論文誌. ハイパフォーマンスコンピューティングシステム, 43(5) (5), 219 - 229, Japanese


• 第3章 シミュレーションの結果は本当に正しいものなのか? 物理シミュレーションの手法と結果の検証 (特集 コンピュータにより可能になった新たな科学/工学分野 基礎からの計算科学・工学--シミュレーション)

  牧野 淳一郎

  CQ出版社, Sep. 2002, インタ-フェ-ス, 28(9) (9), 62 - 71, Japanese


• 専用計算機の将来--GRAPEの挑戦 (特集 計算機科学の新展開--超並列・量子情報・分子計算・計算科学)

  牧野 淳一郎

  サイエンス社, Sep. 2002, Computer today, 19(5) (5), 4 - 10, Japanese


• Formation Process of Supermassive Blackholes : From a Stellar-Dynamical Viewpoint

  MAKINO Junichiro

  Recently, an "intermediate mass" black hole (IMBH) was found in the central region of galaxy M82 through observations made by ASCA, Chandra and SUBARU. This is the first finding of a black hole with the mass more than 100 solar mass but significantly less than 1 million solar mass, and, as such, has completely changed our understanding of the formation process of massive blackholes. We describe our new scenario in which IMBHs serve as the "missing link" between small and massive black holes. IMBHs first form in young compact star clusters through runaway merging of massive stars. While these IMBHs are forming, the host star clusters sink toward the galactic nucleus through dynamical friction, and upon evaporation deposit their IMBHs near the galactic center. The IMBHs then form binaries and eventually merge via gravitational radiation, forming an SMBH.

  The Physical Society of Japan (JPS), 05 May 2002, 日本物理學會誌, 57(5) (5), 330 - 336, Japanese


• Building the Fastest Computer in the World--Do-it-yourself Approach to High Performance Computing

  MAKINO Junichirou

  学術雑誌目次速報データベース由来, Feb. 2002, Japanese scientific monthly, 55(2) (2), 15 - 18, Japanese


• Formation Process of Supermassive Blackholes. From a Stellar-Dynamical Viewpoint.:From a Stellar-Dynamical Viewpoint

  Makino Junichiro

  Recently, an "intermediate mass" black hole (IMBH) was found in the central region of galaxy M82 through observations made by ASCA, Chandra and SUBARU. This is the first finding of a black hole with the mass more than 100 solar mass but significantly less than 1 million solar mass, and, as such, has completely changed our understanding of the formation process of massive blackholes. We describe our new scenario in which IMBHs serve as the "missing link" between small and massive black holes. IMBHs first form in young compact star clusters through runaway merging of massive stars. While these IMBHs are forming, the host star clusters sink toward the galactic nucleus through dynamical friction, and upon evaporation deposit their IMBHs near the galactic center. The IMBHs then form binaries and eventually merge via gravitational radiation, forming an SMBH.

  The Physical Society of Japan, 2002, Butsuri, 57(5) (5), 330 - 336, Japanese


• N-body simulations of Uranian elliptical rings

  Daisaka Hiroshi, Makino Junichiro

  THE JAPANESE SOCIETY FOR PLANETARY SCIENCES, 2002, Abstracts for fall meeting of the Japanese Society for Planetary Science, 2002(0) (0), 31 - 31


• The lives and deaths of star clusters near the Galactic center

  S Portegies Zwart, J Makino, SLW McMillan, P Hut

  Jan. 2002, ASTROPHYSICAL JOURNAL, 565(1) (1), 265 - 279, English


• Heterogeneous Multi - Computer System : A massively parallel processing system combining continuum and particle simulators

  BOKU TAISUKE, MAKINO JUNICHIRO, SUSA HAJIME, UMEMURA MASAYUKI, FUKUSHIGE TOSHIYUKI, UKAWA AKIRA

  HMCS (Heterogeneous Multi-Computer System) is a new parallel processing platform combining massively parallel processors for continuum simulation and particle simulation to realize multi-scale computational physics simulations. We are constructing a prototype system of HMCS with a general purpose scientific parallel processor CP-PACS and a gravity calculation parallel processor GRAPE-6 connecting them via commodity-base parallel network. On the prototype of HMCS, a micro-sopic gravity calculation on GRAPE-6 and a macroscopic radiation hydrodynamic calculation on CP-PACS are performed simultaneously to realize very detailed simulation on computational astrophysics. Both systems are connected via parallel network controlling system named PIO (Parallel I/O System). On each time step, all data of particles are exchanged between two systems hiding communication latency with a special algorithm and buffering effect by PIO. In this paper, we report the overall concept of HMCS, predected performance, implementation and preliminary performance evaluation of the system as well as new physics provided by this system.

  Information Processing Society of Japan (IPSJ), 26 Oct. 2001, IPSJ SIG Notes, 2001(102) (102), 55 - 60, Japanese


• Missing Link Found? --- The ``runaway'' path to supermassive black holes

  Toshikazu Ebisuzaki, Junichiro Makino, Takeshi Go Tsuru, Yoko Funato, Simon Portegies Zwart, Piet Hut, Steve McMillan, Satoki Matsushita, Hironori Matsumoto, Ryohei Kawabe

  14 Jun. 2001, ASTROPHYSICAL SUPERCOMPUTING USING PARTICLE SIMULATIONS, (208) (208), 157 - 166, English


• Mass and Activity of the Off-Center Intermediate Massive BH in M82

  鶴剛, 松本浩典, 松下聡樹, 川辺良平, 臼田知史, 小林尚人, 後藤美和, 原島隆, 岩室史英, 戎崎俊一, 海老塚昇, 牧野淳一郎

  2001, 日本天文学会年会講演予稿集, 2001, 67, Japanese


• 超巨大ブラックホールの作り方

  戎崎俊一, 牧野淳一郎, 鶴剛

  2001, 日本天文学会年会講演予稿集, 2001, 187, Japanese


• 超巨大ブラックホールの形成シナリオとセイファート銀河とスターバースト銀河の関係

  戎崎俊一, 牧野淳一郎, 鶴剛, 川辺良平

  2001, 日本天文学会年会講演予稿集, 2001, 68, Japanese


• 重力多体系の物理と数値計算 : 大自由度系における平衡と緩和(第45回物性若手夏の学校(2000年度)(その2),講義ノート)

  牧野 淳一郎

  この論文は国立情報学研究所の電子図書館事業により電子化されました。サブゼミ

  物性研究刊行会, 2001, 物性研究, 75(4) (4), 618 - 627, Japanese


• 重力多体系の数値計算(<シリーズ>物性研究者のための計算手法入門)

  牧野 淳一郎

  この論文は国立情報学研究所の電子図書館事業により電子化されました。

  物性研究刊行会, 2001, 物性研究, 76(3) (3), 374 - 465, Japanese


• 科学者の活動をどう測るか--科学計量学の視点

  藤垣 裕子, 牧野 淳一郎

  岩波書店, Dec. 2000, 科学, 70(12) (12), 1081 - 1090, Japanese


• 科学の目 GRAPE-5からGRAPE-6へ--世界最高速計算機からみる計算科学

  牧野 淳一郎

  岩波書店, Feb. 2000, 科学, 70(2) (2), 99 - 101, Japanese


• ハミルトン系の数値解法--symplectic or symmetric? (特集 ハミルトン力学系の展開--カオス・可積分系へのアプローチ)

  船渡 陽子, 牧野 淳一郎

  サイエンス社, Aug. 1999, 数理科学, 37(8) (8), 34 - 40, Japanese


• 新任教官紹介

  邑田 仁, 塩谷 光彦, 牧野 淳一郎, 紫藤 貴文, 後藤 敬, 船守 展正

  付属植物園着任にあたって／着任にあたって／着任にあたって／着任のご挨拶／着任にあたって／だんご博士

  東京大学大学院理学系研究科・理学部, Jun. 1999, 東京大学大学院理学系研究科・理学部廣報, 31(1) (1), 7 - 12, Japanese


• GRAPEプロジェクト

  牧野 淳一郎

  サイエンス社, May 1999, Computer today, 16(3) (3), 30 - 35, Japanese


• 現実世界における科学者の役割は

  牧野淳一郎

  1999, 科学, 69(2) (2), 146


• REVIEW: Fast Multipole Method-Applications to Particle Systems

  MAKINO Junichiro, KAWAI Atsushi

  We overview the Fast Multipole Method (FMM) and the Barnes-Hut tree method. These algorithms evaluate mutual gravitational interaction between N particles in O (N) or O (N log N) times, respectively. We present basic algorithms as well as recent developments, such as Anderson's method of using Poisson's formula, the use of FFT, and other optimization techniques. We also summarize the current states of two algorithms. Though FMM with O (N) scaling is theoretically preferred over O (N log N) tree method, comparisons of existing implementations proved otherwize.

  Japan Society of Civil Engineers, 1999, Doboku Gakkai Ronbunshuu A, 2(2) (2), 101 - 109, Japanese


• 研究展望:高速多重極展開法--粒子法への応用を中心として

  牧野 淳一郎, 川井 敦

  土木学会, 1999, 応用力学論文集, (2) (2), 101 - 109, Japanese


• 208 Lunar Accretion from an Impacted-Generated Disk

  Kokubo Eiichiro, Ida Shigeru, Makino Junichiro

  The Japanese Society for Planetary Sciences, 13 Oct. 1998, Abstracts Fall Meeting of the Japanese Society for Planetary Sciences, 1998, 80 - 80, Japanese


• Fast Multipole Method and Tree Method : Fast Algorithms for Many Body Simulations(Numerical Computation)

  Makino Junichiro

  I overview the Fast Multipole Method (FMM) and the Barnes-Hut tree method. These algorithms evaluate mutual gravitational interaction between N particles in O(N) or O(N log N) times, respectively. I present basic algorithms as well as recent developments, such as Anderson's method of using Poisson's formula, the use of FFT, and other optimization techniques. I also summarize the current states of two algorithms. Though FMM with O(N) scaling is theoretically preferred over O(N log N) tree method, comparisons of existing implementations proved otherwise. This result is not surprizing, since the calculation cost of FMM scales as O(Np^2) where p is the order of expansion, while that of the tree method scales as O(N log Np).

  The Japan Society for Industrial and Applied Mathematics, 1998, Bulletin of the Japan Society for Industrial and Applied Mathematics, 8(4) (4), 277 - 287, Japanese


• 等質量球状銀河の合体率

  1997, 481, 83


• 中心ブラックホールをもつ銀河の合体II ブラックホール連星の進化とコアの構造

  1997, 478, 58


• 図のひろがり

  砂川 一郎, 玉垣 庸一, 中村 春木, 牧野 淳一郎, 福重 俊幸, 古川 義純, 鈴木 繁夫, 川野 常夫, 細川 力, 高山 峯夫, 石倉 恆之

  日本図学会, 1997, 図学研究, 31(0) (0), 160 - 165, Japanese


• ダ-クマタ-ハロ-のカスプの起源

  1997, 477, 9


• N体系における動力学的膨張

  1997, 49, 345


• GRAPE-4:N体計算のための起並列専用計算機

  1997, 480, 432


• 専用計算機による宇宙物理

  牧野 淳一郎

  日本流体力学会, 25 Dec. 1996, ながれ : 日本流体力学会誌, 15(6) (6), 475 - 478, Japanese


• 1C2 学際的研究における分野間知識統合の解析 : 環境科学と生物物理学を対象とした論文傾向の経年変化

  藤垣 裕子, 牧野 淳一郎, 内田 斉, 土井 伸一

  研究・イノベーション学会, 31 Oct. 1996, 年次学術大会講演要旨集, 11, 35 - 40, Japanese


• 任意力による多体シュミレーションのための専用計算機MD-GRAPE

  1996, 天体, 468, 51


• 中心ブラックホールをもつ銀河の合体I・等重量銀河の階層的合体

  1996, 天体物理学雑誌, 465, 527


• 時間対称化クスタンハイモ・シュティ-フェル正則化

  1996, 112, 1697


• Hydrodynamics in the space. Astrophysics by special purpose computer.

  牧野 淳一郎

  The Japan Society of Fluid Mechanics, 1996, nagare, 15(6) (6), 475 - 478, Japanese


• Black Hole Binaries and the Formation of the Cores of Elliptical Galaxies

  EBISUZAKI Toshikazu, MAKINO Jun-ichiro

  日本天文学会, Jun. 1995, The Astronomical herald, 88(6) (6), 238 - 243, Japanese


• A special - purpose computer for solving a dense matrix based on the Gaussian elimination algorithm : GENERAL - 1

  SEIKI Yasushi, FUKUSHIGE Toshiyuki, TAIJI Makoto, MAKINO Junichiro, OGAWA Masaaki, EBISUZAKI Toshikazu

  We describe a special-purpose computer for solving a set of linear equations. We usually use Gaussian elimination algorithm to solve a dense matrix. In this method the number of operations to solve the matrix is proportional to a cube of the matrix size. Therefore, we require a large amount of computational power for large-scale problems. However, the calculations are dominated by sum-of-products operations in the forward eliminations. In the paper, we propose a system that consists of a special-purpose computer and a host computer. The special-purpose computer does only sum-of-products operations, and the host computer does all the other operations. We are developing an experimental machine of GENERAL-1 (Gaussian ElimiNation mEthod paRALlel machine). It will have a peak performance of 80Mflops and will solve a matrix of n=1000 in 20 seconds.

  Information Processing Society of Japan (IPSJ), 10 Mar. 1995, IPSJ SIG Notes, 1994(29) (29), 65 - 72, Japanese


• A Special - Purpose Computer for Radiosity Method in Computer Graphics

  NARUMI Tetsu, MAKINO Junichiro, EBISUZAKI Toshikazu, OMURA Koichi

  We have designed a special-purpose computer for radiosity method. In the radiosity method, the most time-consuming part is the ray intersection test. We propose `block ray traverse' which reduces the time for voxel traverse and makes parallel processing of ray intersection test easy. The special-purpose computer accelerates only the ray intersection test. This computer is composed of eight boards, and has 512 processors for the ray intersection test. Host computer, which is connected to the special-purpose computer, does all other operations. If we use twenty sets of this system in parallel, we can calculate radiosity equation within ten seconds.

  Information Processing Society of Japan (IPSJ), 10 Mar. 1995, IPSJ SIG Notes, 1994(29) (29), 57 - 64, Japanese


• GRAPE - 4 : THE TERAFLOPS MACHINE FOR GRAVITATIONAL MANY - BODY SIMULATIONS

  EBISUZAKI Toshikazu, MAKINO Junichiro, TAIJI Makoto, SUGIMOTO Daiichiro

  We are developing GRAPE-4, the teraflops machine for gravitational many-body simulations. Gravitational many-body systems, such as galaxies and globular clusters, consists of a lot of stars, which interact each other trough gravitational force. We developed two custom LSIs, HARP chip and PROMETHEUS chip. HARP chip calculates force and time derivative of force, while PROMETHEUS chip performs predictor calculations of positions and velocities of particles. We use about 2000 HARP chips and about 40 PROMETHEUS chips. In the present paper, we briefly describe the GRAPE-4 project.

  Information Processing Society of Japan (IPSJ), 10 Mar. 1995, IPSJ SIG Notes, 1994(29) (29), 49 - 56, Japanese


• 動散乱による背景放射の等方化

  1995, 日本天文学会誌, 47, 493


• より改良されたリープフロッグ法の構成

  1995, 天体物理学雑誌短報, 443, 93


• A Special Purpose Hardware with Disk Array for Radiosity Method

  Narumi Tetsu, Makino Junichiro, Ebisuzaki Toshikazu, Omura Koichi

  We propose a special purpose hardware for radiosity calculation. In the radiosity method, the most time consuming part is the calculation of the form factor. When we perform the rendering of the same room with different lighting, the same form factors are evaluated each time. We propose the new method in which we store the form factors in a disk array and use them many times. The data transfer speed of a disk array can be made comparable to the speed of main memory unit of present workstations. This system will be able to calculate the radiosity in nearly real time.

  Information Processing Society of Japan (IPSJ), 14 Oct. 1994, IPSJ SIG Notes, 1994(88) (88), 19 - 24, Japanese


• 多重重力散乱による光線間距離の指数間数的成長について(共著)

  1994, 天体物理学雑誌短報, 436, 111


• 多重重力散乱による遠方の銀河の減光(共著)

  1994, 天体物理学雑誌 レターズ, 424, 17


• 高性能専用計算機GRAPE-2Aの分子動力学への応用

  1994, 計算化学会誌, 15(12) (12), 1372


• 銀河核中の3重ブラックホール(共著)

  1994, 天体物理学雑誌, 436, 607


• 宇宙線景幅射の異方性への重力散乱の影響

  1994, 天体物理学雑誌短報, 436, 107


• 多重重力レンズによる遠方の銀河像の変形とその宇宙論的意味について(Nonlinear Dynamics in Chaotic Systems,自己重力多体系における非線形・非平衡現象,研究会報告)

  牧野 淳一郎, 船渡 陽子

  遠方の銀河などの天体の像が、多重重力レンズによってどのように変形し、明るさを変化させるかを数値計算で調べた。z>1では、重力レンズ効果がなかったときに比べて典型的な銀河の明るさは(1+z)^<-1.4√<Ω_s>に比例して暗くなることがわかった。ここで、Ω_sは銀河等のレンズ効果がある比較的コンパクトな天体の密度パラメータである。なお、平均の明るさは変化しない、すなわち、小数の銀河は重力レンズによって非常に明るくなる。

  素粒子論グループ 素粒子研究編集部, 20 Dec. 1993, 素粒子論研究, 88(3) (3), C57 - C58, Japanese


• GRAPE - 4 : A massively - parallel special - purpose computer system for astrophysical many - body simulations

  Taiji Makoto, Makino Junichiro, Kokubo Eiichiro, Ebisuzaki Toshikazu, Sugimoto Daiichiro

  We are developing GRAPE-4, a massively-parallel special-purpose computer for astrophysical N-body simulations. We have developed an application-specific LSI, the HARP (Hermite AcceleratoR Pipe) chip. The HARP chip calculates the gravitational interaction between particles. We invented the "Virtual Multiple Pipeline" architecture for HARP chip, which decrease the input data transfer rate. The HARP chip performs about 20 floating point operations per clock cycle and works at 30 MHz in the worst case. Therefore, the performance of the HARP chip exceeds 600 Mflops. GRAPE-4 will consist of about 2000 HARP chips using multi-chip modules. The sustained performance will exceed 1 Tflops when the number of particles exceeds 2×10^5.

  Information Processing Society of Japan (IPSJ), 19 Aug. 1993, IPSJ SIG Notes, 1993(72) (72), 33 - 40, Japanese


• HARP - 1 : A Special - Purpose Computer for N - body Simulation with the Hermite Integrator

  Kokubo Eiichiro, Makino Junichiro, Taiji Makoto

  We have designed and built HARP (Hermite Accelerator Pipeline)-1, a special-purpose computer for solving astronomical N-body problems with a high accuracy using the Hermite integrator. The Hermite integrator uses analytically calculated time-derivatives of the acceleration, in addition to the acceleration, to integrate orbits of particles. HARP-1 has a 24-stage pipeline to perform the calculation of the acceleration and its time derivative, which is the most expensive part of the Hermite scheme. The pipeline calculates one gravitational interaction at every three clock cycles. Thus, the acceleration and its time derivative of a particle are calculated in 3N+24 clock cycles, where N is the number of particles. The peek speed of HARP-1 is 160Mflops.

  Information Processing Society of Japan (IPSJ), 19 Aug. 1993, IPSJ SIG Notes, 1993(72) (72), 49 - 56, Japanese


• DISCRETENESS NOISE VERSUS FORCE ERRORS IN N-BODY SIMULATIONS (VOL 402, PG L85, 1993)

  L HERNQUIST, P HUT, J MAKINO

  Jul. 1993, ASTROPHYSICAL JOURNAL, 411(1) (1), L53 - L53, English

  Others


• 早野龍五・高橋忠幸, 計算物理-Computer in Physics, 共立出版, 東京, 1992, xii+252p., 2,987円

  牧野 淳一郎

  一般社団法人日本物理学会, 05 Mar. 1993, 日本物理學會誌, 48(3) (3), 221 - 222, Japanese


• 多重重力レンズによる遠方の銀河像の変形とその宇宙論的意味について(基研短期研究会「自己重力多体系における非線形・非平衡現象」報告,研究会報告)

  牧野 淳一郎, 船渡 陽子

  遠方の銀河などの天体の像が、多重重力レンズによってどのように変形し、明るさを変化させるかを数値計算で調べた。z>1では、重力レンズ効果がなかったときに比べて典型的な銀河の明るさは(1+z)^<1.4√(Ω_s)>に比例して暗くなることがわかった。ここで、Ω_sは銀河等のレンズ効果がある比較的コンパクトな天体の密度パラメータである。なお、平均の明るさは変化しない、すなわち、小数の銀河は重力レンズによって非常に明るくなる。

  物性研究刊行会, 1993, 物性研究, 61(2) (2), 151 - 152, Japanese


• 合体銀河における巨大連ブラックホールの進化.I.球形銀河の中の連ブラックホールの進化

  1993, 45,303


• 原始惑星による微惑星の散乱:暴走的成長の減速 (共著)

  1993, イカルス, 106, 210


• 銀河団の進化

  1993, 45,289


• ディスクポテンシャル中を運動する粒子の非等方的速度散乱の起源

  1993, 263,875


• ディスクポテンシャヤル中を回転する格子の速度分散の異子性の起源(共著)

  1993, 王立天文学会月報, 263, 875


• グレーププロジェクト:その全体像

  1993, 45,269


• グレープのソフトウェア体系

  1993, 45,279


• グレープによるならされた粒子を用いた流体力学

  1993, 45,311


• WINE-1:周期境界のN体シミュレーション専用計算機

  1993, 45,377


• 天文・物理学における専用計算機--いかにして手を抜くか

  牧野 淳一郎

  日本天文学会, Apr. 1992, 天文月報, 85(4) (4), p142 - 147, Japanese


• コンピュ-タ-・シミュレ-ションが切り拓く天文学--星から宇宙の果てへ-9-自己重力多体系の進化--球状星団,銀河集団化

  牧野 淳一郎, 伊藤 誠

  日本天文学会, Sep. 1990, 天文月報, 83(9) (9), p256 - 260, Japanese


• A special processor for gravitational many-body problems-GRAPE.

  戎崎俊一, 伊藤智義, 牧野淳一郎, 杉本大一郎

  Aug. 1990, 天文月報, 83(8) (8), 224 - 226, Japanese


• GRAVITATIONAL N-BODY ALGORITHMS - A COMPARISON BETWEEN SUPERCOMPUTERS AND A HIGHLY PARALLEL COMPUTER

  J MAKINO, P HUT

  Jun. 1989, COMPUTER PHYSICS REPORTS, 9(4) (4), 199 - 246, English

  Book review

• Principles of High-Performance Processor Design For High Performance Computing, Deep Neural Networks and Data Science

  Junichiro Makino

  Single work, Springe, Sep. 2021


• 被曝評価と科学的方法

  牧野, 淳一郎

  岩波書店, 2015, Japanese, ISBN: 9784000296366


• 原発事故と科学的方法

  牧野, 淳一郎

  岩波書店, Oct. 2013, Japanese, ISBN: 9784000296168


• シミュレーション天文学

  富阪, 幸治, 花輪, 知幸, 牧野, 淳一郎

  日本評論社, 2007, Japanese, ISBN: 9784535607347


• とんでる力学

  牧野, 淳一郎, パリティ編集委員会

  丸善, 2005, Japanese, ISBN: 4621076094


• 研究評価・科学論のための科学計量学入門

  丸善, 2004


• 科学計量学の挑戦 : コミュニケーションの自己組織化

  Leydesdorff, L. A., 藤垣, 裕子, 林, 隆之, 富沢, 宏之, 平川, 秀幸, 調, 麻佐志, 牧野, 淳一郎

  玉川大学出版部, 2001, Japanese, ISBN: 4472401517


• パソコン物理実地指導

  牧野, 淳一郎

  共立出版, 1999, Japanese, ISBN: 4320033647


• 専用計算機による科学シミュレーション

  ジョン・ワイリー, 1998


• Scientific Simulations with Special-Purpose Computers The GRAPE Systems

  John Wiley and Sons., 1998


• Dynamical evolution of star clusters - confrontation of theory and observations : proceedings of the 174th Symposium of the International Astronomical Union, held in Tokyo, Japan, August 22-25, 1995

  International Astronomical Union. Symposium, Hut, Piet, 牧野, 淳一郎

  Kluwer Academic Publishers, English, ISBN: 0792340698


• Astrophysical supercomputing using particle simulations : proceedings of the 208th Symposium of the International Astronomical Union, held in Tokyo, Japan, 10-13 July 2001

  International Astronomical Union. Symposium, 牧野, 淳一郎, Hut, Piet

  Astronomical Society of the Pacific, English, ISBN: 1583811397


• New horizons of computational science : proceedings of the international symposium on supercomputing held in Tokyo, Japan, September 1-3, 1997

  戎崎, 俊一, 牧野, 淳一郎

  Kluwer Academic Publishers, English, ISBN: 0792370503


• Scientific simulations with special-purpose computers : The GRAPE Systems

  牧野, 淳一郎, Taiji, Makoto

  Wiley, English, ISBN: 047196946X

• スーパーコンピューター「富岳」と宇宙物理・惑星科学

  牧野淳一郎

  日本天文学会2021年春季年会企画セッションZ3「富岳時代のシミュレーション天文学」, Mar. 2021

  Invited oral presentation


• シミュレーションによる宇宙物理―「京」、「富岳」、さらにその先へ

  牧野淳一郎

  日本物理学会大阪支部 2020年度 公開シンポジウム「AIで切り拓く物理の世界」, Dec. 2020

  [Invited]

  Public discourse


• 東日本大震災後の環境放射線研究と科学コミュニケーションの問題点

  牧野淳一郎

  物理学会シンポジウム, Sep. 2020

  [Invited]

  Invited oral presentation


• A64fx アーキテクチャ向けアプリケーションチューニング-差分法を例に

  牧野淳一郎

  第14回アクセラレーション技術発表討論会「COVID-19と戦うアクセラレーション技術」, Sep. 2020, Japanese

  [Invited]

  Invited oral presentation


• 3.11 以後の科学者コミュニティの情報発信

  物理学会シンポジウム ( ウェブ開催 ) 「個人被ばく線量の物理学的評価についての検討」, Mar. 2020

  [Invited]


• 「富岳」の概要と「富岳」での大規模惑星科学シミュレーション

  シンポジウム最新科学で迫る月と地球の起源, Oct. 2019


• Algorithms to use accelerators effectively with FDPS and performance of applications

  Daisuke Namekata, Masaki Iwasawa, Keigo Nitadori, Kentaro Nomura, Long Wang, Miyuki Tsubouchi, Junichiro Makino

  Japan Geoscience Union Meeting 2019, May 2019, Japanese, Makuhari Messe, Chiba, Domestic conference

  Poster presentation


• Current status of post-K Exploratory Challenge, computational planetary science

  牧野 淳一郎

  Japan Geoscience Union Meeting 2019, May 2019, Japanese, Makuhari Messe, Chiba, Domestic conference

  Oral presentation


• Development of N-body Simulation Code for Planetary System Formation With Particle-Particle Particle-Tree Scheme

  Yota Ishigaki, Junko Kominami, Junichiro Makino, Masaki Fujimoto

  Japan Geoscience Union Meeting 2019, May 2019, Japanese, Makuhari Messe, Chiba, Domestic conference

  Oral presentation


• Global N-body Simulation from Inner Region to Outer Region

  Junko Kominami, Shigeru Ida, Junichiro Makino, Yota Ishigaki, Hiroshi Daisaka, Masaki Fujimoto

  Japan Geoscience Union Meeting 2019, May 2019, Japanese, Makuhari Messe, Chiba, Domestic conference

  Poster presentation


• 粒子法シミュレーションコード開発のためのフレームワーク(FDPS)の開発

  岩澤 全規, 行方 大輔, 坂本 亮, 中村 孝史, 木村 耕行, 似鳥 啓吾, 野村 昴太郎, 坪内 美幸, 牧野 淳一郎

  第167回ハイパフォーマンスコンピューティング研究会, Dec. 2018, Japanese, 沖縄産業支援センター, Domestic conference

  Oral presentation


• Temporal blockingと相性のよいメッシュ陽解法スキームの開発

  石原 陽平, 牧野 淳一郎, 似鳥 啓吾, 行方 大輔, 岩澤 全規, 坪内 美幸

  第32回数値流体力学シンポジウム, Dec. 2018, Japanese, 機械振興会館（東京）, Domestic conference

  Oral presentation


• Formura DSL による temporal blocking の PEZY-SC2 での実装と性能評価

  田中 英行, 石原 陽平, 坂本 亮, 中村 孝史, 木村 耕行, 似鳥 啓吾, 坪内 美幸, 牧野 淳一郎

  第32回数値流体力学シンポジウム, Dec. 2018, Japanese, 機械振興会館（東京）, Domestic conference

  Oral presentation


• Pros and Cons of HPCx benchmarks

  Jun Makino

  The International Conference for High Performance Computing, Networking, Storage, and Analysis (SC18), Nov. 2018, English, Dallas, Texas, International conference

  Oral presentation


• Automatic Generation of High-Order Finite-Difference Code with Temporal Blocking for Extreme-Scale Many-Core Systems

  Hideyuki Tanaka, Youhei Ishihara, Ryo Sakamoto, Takashi Nakamura, Yasuyuki Kimura, Keigo Nitadori, Miyuki Tsubouchi, Jun Makino

  Fourth International IEEE Workshop on Extreme Scale Programming Models and Middleware (ESPM2 2018), Nov. 2018, English, Dallas, Texas, International conference

  Oral presentation


• ポスト「京」萌芽的課題「生命を育む惑星の起源・進化と環境変動の解明」の現況

  牧野 淳一郎

  日本地球惑星科学連合2018年大会, May 2018, Japanese, 幕張メッセ, Domestic conference

  Oral presentation


• Speed-up efficiencies of an SPH code with FDPS on GPUs or PEZY-SCs

  Natsuki Hosono, Masaki Iwasawa, Daisuke Namekata, Ataru Tanikawa, Keigo Nitadori, Takayuki Muranushi, Junichiro Makino

  Japan Geoscience Union Meeting 2018, May 2018, English, Makuhari Messe, Chiba, Domestic conference

  Poster presentation


• Numerical simulations of the giant impact onto the magma ocean

  Natsuki Hosono, Shun-ichiro Karato, Junichiro Makino, Takayuki R. Saitoh

  Japan Geoscience Union Meeting 2018, May 2018, English, Makuhari Messe, Chiba, Domestic conference

  Oral presentation


• High-resolution global N-body simulation of planet formation with fragmentation

  Junko Kominami, Hiroshi Daisaka, Junichiro Makino, Masaki Fujimoto

  Japan Geoscience Union Meeting 2018, May 2018, English, Makuhari Messe, Chiba, Domestic conference

  Poster presentation


• Development of a particle-based parallel code for mantle convection with the variable inertia method

  Takayuki Saitoh, Natsuki Hosono, Kosuke Takeyama, satoko yamamoto, Daisuke Namekata, Junichiro Makino

  Japan Geoscience Union Meeting 2018, May 2018, English, Makuhari Messe, Chiba, Domestic conference

  Oral presentation


• 衝突破壊プロセスを入れたN体計算における原始惑星の動径方向移動

  小南 淳子, 台坂 博, MAKINO JUNICHIRO, 藤本 正樹

  JpGU-AGU Joint Meeting 2017, May 2017, Japanese, 幕張メッセ, International conference

  Oral presentation


• ポスト「京」萌芽的課題「生命を育む惑星の起源・進化と環境変動の解明」の現況

  MAKINO JUNICHIRO

  JpGU-AGU Joint Meeting 2017, May 2017, Japanese, 幕張メッセ, International conference

  Oral presentation


• Terrestrial magma ocean origin of the Moon: A numerical study of a giant impact incorporating the difference of the equations of state for liquids and solids

  細野 七月, 唐戸 俊一郎, MAKINO JUNICHIRO

  JpGU-AGU Joint Meeting 2017, May 2017, English, 幕張メッセ, International conference

  Oral presentation


• FDPSとPEZY-SCデバイスを用いた、SPHコードの開発と巨大衝突への応用計算

  細野 七月, 岩澤 全規, 行方 大輔, 谷川 衝, 似鳥 啓吾, 村主 崇行, MAKINO JUNICHIRO

  JpGU-AGU Joint Meeting 2017, May 2017, Japanese, 幕張メッセ, International conference

  Oral presentation


• 惑星形成N体計算の大粒子数化に向けて：FDPSを用いたParticle-Particle Particle-Tree法の並列計算

  山川 暁久, MAKINO JUNICHIRO, 斎藤 貴之, 小南 淳子, 竹山 浩介

  日本地球惑星科学連合2016年大会, May 2016, Japanese, 幕張メッセ, Domestic conference

  Poster presentation


• 大規模惑星集積並列N体計算：ガス円盤内での微惑星による原始惑星の外側移動

  小南 淳子, 台坂 博, MAKINO JUNICHIRO, 藤本 正樹

  日本地球惑星科学連合2016年大会, May 2016, Japanese, 幕張メッセ, Domestic conference

  Oral presentation


• 高性能構造格子計算言語Formura

  村主 崇行, MAKINO JUNICHIRO

  日本地球惑星科学連合2016年大会, May 2016, Japanese, 幕張メッセ, Domestic conference

  Poster presentation


• 「京」からポスト「京」へ

  MAKINO JUNICHIRO

  日本地球惑星科学連合2016年大会, May 2016, Japanese, 幕張メッセ, Domestic conference

  Oral presentation


• メッシュフリー法における自由表面と接触不連続面への適応

  山本 智子, MAKINO JUNICHIRO

  日本地球惑星科学連合2016年大会, May 2016, Japanese, 幕張メッセ, Domestic conference

  Poster presentation


• SPH法における、人工粘性とそのスイッチ、微分演算子の離散化に関するテスト

  細野 七月, 斎藤 貴之, MAKINO JUNICHIRO

  日本地球惑星科学連合2016年大会, May 2016, Japanese, 幕張メッセ, Domestic conference

  Poster presentation


• FDPS(Framework for Developing Particle simulator)による計算惑星科学

  岩澤 全規, 谷川 衝, 細野 七月, 村主 崇行, MAKINO JUNICHIRO

  日本地球惑星科学連合2016年大会, May 2016, Japanese, 幕張メッセ, Domestic conference

  Oral presentation


• Density Independent Smoothed Particle Hydrodynamicsを用いた衝突・クレータリングの数値計算

  細野 七月, 岩澤 全規, 谷川 衝, 似鳥 啓吾, 村主 崇行, MAKINO JUNICHIRO

  日本地球惑星科学連合2016年大会, May 2016, English, 幕張メッセ, Domestic conference

  Poster presentation


• GRAPE9-MPX : A development of an accelerator dedicated for arbitrary-precision arithmetic by the FPGA boards

  MOTOKI Shinji, DAISAKA Hiroshi, NAKASATO Naohito, ISHIKAWA Tadashi, YUASA Fukuko, FUKUSHIGE Toshiyuki, KAWAI Atsushi, MAKINO Jun'ichiro

  IEICE technical report, Sep. 2014, Japanese, Higher order corrections in perturbative quantum field theory are required for precise theoretical analysis to investigate the new physics. Feynman loop diagrams which appear in the calculation of the corrections are taken into account, leading to the evaluation of loop integrals. We developed GRAPE9-MPX system consisting of multiple FPGA boards to accelerate parallel computation of loop integrals. In the system, we implemented Processor Elements (PE) to realize quadruple/hexuple-precision arithmetics in FPGA. The theoretical perk speed in the current implementation is about 6.6 Gflops (quadruple-precision) and 3.2 Gflops (hexuple-precision). With the compiler we are developing, the program code is generated automatically with only inserting directives in C/C++ code. We present performance results for the case of Feynman two-loop integrals with quadruple precision and achieve the effective performance of 2.4Gflops for 1 board, 4.7Gflops for 2 boards, and 9.1Gflops for 4 boards, respectively.


• O5-05 任意の不連続面に対応可能なSPH法の開発(口頭発表セッション5 惑星形成III,口頭発表)

  山本 智子, 斎藤 貴之, 牧野 淳一郎

  日本惑星科学会秋期講演会予稿集, Sep. 2014, Japanese


• P1-22 物理量の連続性を仮定しないSPH法の開発(ポスターセッション1,ポスター発表)

  山本 智子, 斎藤 貴之, 牧野 淳一郎

  日本惑星科学会秋期講演会予稿集, Nov. 2013, Japanese


• P1-21 Density Independent Smoothed Particle Hydrodynamicsによる巨大衝突シミュレーション(ポスターセッション1,ポスター発表)

  細野 七月, 斎藤 貴之, 牧野 淳一郎

  日本惑星科学会秋期講演会予稿集, Nov. 2013, Japanese


• O4-03 Density Independent Smoothed Particle Hydrodynamicsの非理想気体への拡張(口頭発表セッション4(惑星形成),口頭発表)

  細野 七月, 斎藤 貴之, 牧野 淳一郎

  日本惑星科学会秋期講演会予稿集, Nov. 2013, Japanese


• Personal view on the future HPC architecture

  牧野 淳一郎

  ハイパフォーマンスコンピューティングと計算科学シンポジウム論文集, Jan. 2012, Japanese

• 日本天文学会

• アクセラレータ上で動作する粒子系シミュレータ開発フレームワークの開発

  岩澤 全規, 牧野 淳一郎, 細野 七月

  日本学術振興会, 科学研究費助成事業, 基盤研究(C), 松江工業高等専門学校, 01 Apr. 2021 - 31 Mar. 2024

  粒子法シミュレーションは、密度コントラストの強い系や空隙のある系、物体の破壊や衝突等のシミュレーションに適しており、自然科学や工学の幅広い分野で使われている。しかし、並列粒子法シミュレーションコードの開発は容易ではなく、多くの研究者がコード開発や最適化に多くの時間を割く必要があった。そのため、我々は容易に並列粒子法シミュレーションプログラムを開発するためのフレームワークFDPS(Framework for Developing Particle Simulators)を開発した。しかし、現在のFDPSでGPGPUなどのアクセラレータを使う場合、相互作用計算のみをアクセラレータ上で計算することになる。しかし、星団や銀河など粒子の速度分散が大きい系のシミュレーションでは、相互作用リストを再利用することができないため、相互作用計算をアクセラレータで高速化しても、ホストコンピュータ上で行う木構造や相互作用リストの構築が性能ボトルネックになり、性能向上が難しい。そこで、本研究では木構造や相互作用リスト構築、その他の計算も可能な限りアクセラレータ上で動作させる、アクセラレータ対応FDPSの開発を行う。 当該年度では、アクセラレータ上でFDPSを動作させる際に、既存のユーザーアプリケーションからなるべく変更が少ない形で移行できるかの検討を行った。結果、現在のユーザーが開発したアプリケーションプログラム上の関数に関数識別子を付ける程度の変更でプログラムが動作するように改良できることが分かった。さらにアクセラレータとしてはNvidiaのGPGPUを考えCUDAを用い、フレームワークの実装も行っている。現在は領域分割や粒子交換をCUDAで実装した。


• "Telling Fukushima" : ICT teaching resource development and evaluation

  土井 妙子, 藤岡 達也, 西崎 伸子, 牧野 淳一郎, 田口 真奈, 後藤 忍, 明日香 壽川, 濱岡 豊

  Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (B), Kanazawa University, 01 Apr. 2020 - 31 Mar. 2023


• 国立研究開発法人新エネルギー・産業技術総合開発機構, 「高効率・高速処理を可能とするAIチップ・次世代コンピューティングの技術開発／【研究開発項目①】革新的AIエッジコンピューティング技術の開発」, 「FPGA IP と可変精度演算コアの融合による超低消費電力エッジヘビーコンピューティング向けSoCの研究開発」, Dec. 2018 - Mar. 2023


• 計算機の中の惑星探査: 計算機の中の惑星リングの実現にむけて

  台坂 博, 大槻 圭史, 岩澤 全規, 牧野 淳一郎, 似鳥 啓吾

  Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C), Grant-in-Aid for Scientific Research (C), Hitotsubashi University, Apr. 2018 - Mar. 2021

  本研究では、土星リングに代表される惑星リングに関する諸問題(構造形成や起源）の解決を図るために、これまでにない大粒子数を用いた惑星リング全系のN体シミュレーションを可能とする方法を確立し、その手法を用いたシミュレーションを実施し、その有用性を実証することを目的とする。本年度は計算手法を検討し、その結果に基づいた数値計算コードの開発を行った。 検討課題の一つは、重力計算で用いられるツリー法のアルゴリズムの改良である。リングはほぼ２次元的な円盤形状で、かつ、リングの幅が軌道半径に比べて小さいため、通常のデカルト座標を用いた空間分割が不適切、また、リング粒子はケプラー回転に移動するため、デカルト座標を用いた空間分割では粒子はすぐに領域外に移動してしまう。結果、それらに起因するノード間通信が発生する。この問題を解決するために、円筒座標系と粒子と回転座標系を導入し、リング系に適合するようにアルゴリズムを改良した。このアルゴリズムに基づいた重力計算を加速するために、PEZY社が開発したPEZY-SC2向けへの実装を行った。また、ミドルウェア(FDPS)への実装も行い、そららを用いた数値計算コードを開発した。現在、コードの検証作業を行っている。 また、リング全系計算に向けた計算の一環として局所系の計算を行った。土星リングはいろいろな大きさの粒子からなるが、小さい粒子の量はサイズ分布から期待された量より少ないことがカッシーニの観測などにより示唆されている。その理解として粘着力が提案されている。その効果を調べるために局所系のN体シミュレーションを行い、粒子間の衝突速度を調べた。土星メインリングでの粒子間衝突は、大きい粒子の表面にくっついた小さい粒子を再放出するには小さいことなど、観測結果を説明することが出来ることなどを明らかにした。 これらの成果については研究会や学会等で発表を行った。


• ヘテロジニアス・メニーコア計算機による大規模計算科学

  姫野 龍太郎, 牧野 淳一郎, 古市 幹人, 山崎 匡, 石川 正, 黒川 顕

  文部科学省, 次世代領域研究開発, 国立研究開発法人理化学研究所, Nov. 2017 - Mar. 2020


• 太陽系外惑星（第二の地球）の誕生と太陽系内惑星環境変動の解明（生命を育む惑星の起源・進化と惑星環境変動の解明）

  牧野 淳一郎

  文部科学省, 平成29年度科学技術試験研究委託事業, 2017, Principal investigator

  Competitive research funding


• 太陽系外惑星（第二の地球）の誕生と太陽系内惑星環境変動の解明（生命を育む惑星の起源・進化と惑星環境変動の解明）

  牧野 淳一郎

  文部科学省, 科学技術試験研究委託事業, 2016, Principal investigator

  Competitive research funding


• Highly productive software environment based on Ruby for parallel and distributed computing systems

  HIRAKI Kei, SASADA Koichi, SADAKANE Kunihiko, MAKINO Junichiro, IDA Shigeru, INABA Mary

  Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (S), The University of Tokyo, 01 Apr. 2009 - 31 Mar. 2015

  In this study, we extended a computer language Ruby to increase execution performance to establish a new high-productive computer language HPC Ruby. We successfully developed HPC Ruby static compiler and runtime systems. Based on our evaluation, HPC Ruby showed from 50 % to 90% execution performance in numerical programs compared to C language. In order to show feasibility of the use of Ruby in scientific computation, we developed Ruby based software in earth science, astrophysics, and discrete optimization areas. As for the ultra high-speed distributed computing using 100Gbps internet, we developed 40Gbps single stream TCP system and 100Gbps multi-stream TCP system. We performed very long distance internet experiments using Tokyo, New Orleans (US) and Amsterdam (Europe). Performance results shows we can efficiently utilize more than 90% of available bandwidth in both 40G and 100G environment. This was the world first realization of very long-distance high-speed TCP data-transfer.


• Study of the evolution of planetary system, star clusters and galaxies using a special-purpose computer

  MAKINO Junichiro, FUNATO Yoko, NAKASATO Naohito, WADA Keiichi, YOSHIDA Naoki

  Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (A), 2009 - 2011

  We developed a new special-purpose computer, GRAPE-8, designed to be used with Particle-Particle Particle Tree method, which is a method to handle both collisionless and collisional systems efficiently. The processor chip of GRAPE-8 achieved the performance per watt of 40 Gflops/W, which is more than 30 times better than those of the latest general-purpose microprocessors. The performance per watt of the total system is around 6Gflops/W, nearly an order of magnitude better than that of usual PC clusters. Thus, we succeeded to reduce the cost of electricity for large-scale astrophysical simulations.


• Formation of Our Galaxy Studied with Super-High Resolution Next-Generation Simulator

  TOMISAKA Kohji, MAKINO Junichiro, WADA Keiichi, KOKUBO Eiichiro, MATSUMOTO Tomoaki, YOSHIDA Naoki

  Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (B), National Astronomical Observatory of Japan, 2005 - 2007

  1. We completed (1) a parallelized N-body plus SPH hydro code called ASURA and (2) a PC cluster composed of 16 PC's each connected with a specific hardware for self-gravity (GRAPE). Since these enable us to study the formation process of our Galaxy, we call them Milky Way Simulator (MWS). (1) We perform high resolution simulations with MWS, in which one galaxy is expressed with 10^7 particles, which is much larger than previous similar simulations. From them, we can trace the condensation process of interstellar gas to form stars up to〜10^2cm-3, which coincides with the density of molecular clouds in our Galaxy. (2) A phenomenological parameter, C_, has been assumed, with which the star formation rate per unit volume is assumed as C^_×ρ_/t_, where>_ as and t_ represent, respectively, the local gas density and free-wall timescale of the gas. Our high resolution simulations indicate us that the star formation rate is well expressed with a radiative cooling time of a gas with a density of 10^0cm_<-3>, irrespective of C_. (3) Thus, we obtained a prescription how to manage the star formation in low resolution simulations. (4) We performed simulations of galaxy-galaxy collision. We found that a star formation burst is expected in the early phase of the collision far before making a galaxy merger. 2. We developed an adaptive mesh refinement (AMR) code for self-gravitating magnetohydrodynamical simulation based on the finite-difference scheme. Calculating the fragmentation process in the protostellar phase, we have confirmed that this code gives the consistent result obtained with previous nested grid code. This enables us to extend the subjects. 3. To compare the simulation result with observation, we have developed a radiative transfer code for molecular rotational transitions based on Monte Carlo method. We have applied this to starburst galaxy and star forming molecular cloud.


• Study of the evolution of dense stellar systems by large-scale simulations on special-purpose computers

  MAKINO Junichiro, FUNATO Yoko

  Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (C), The University of Tokyo, 2003 - 2005

  The purpose of this study is to clarify the dynamical evolution of dense stellar systems, such as globular clusters, so-called young and compact clusters, and galactic nuclei, by means of direct N-body simulations. The focus of the study is how the massive black holes grow at the center of these systems. Specifically, we placed two goals. (a) To determine the criterion for the occurrence of the merging instability, in which massive stars merge with other massive stars progressively to form supermassive stars, and (b) to identify the observable signature of massive central black holes in globular clusters and other massive star clusters. As for the condition for the merging instability, we found that the condition is that the initial dynamical friction timescale of massive stars is short (less than 3Mys) and that the initial core radius is fairly small. When fitted by a King mode, W0 must be 8 or larger. For the observational signature of the central black hole, previous observational studies looked for a cusp with slope -7/4, predicted from simple single-component model. By means of N-body calculation in which stellar evolution and stellar mass function are taken into account, we found that the central region of a globular cluster with central massive black hole appears as almost flat core.


• 中?大?巨大質量ブラックホールの形成に関する恒星系力学からみた統一的理解の構築

  船渡 陽子, 牧野 淳一郎

  日本学術振興会, 科学研究費助成事業, 特定領域研究, 東京大学, 2003 - 2004

  本研究の目標は,N体計算によりブラックホールを持つ恒星系の力学進化を調べ,恒星系の中にあるブラックホールの成長を明らかにすることである。この数値計算が難しいのは,ブラックホールとそのまわりの恒星の質量比が大きいことと,多くの場合にブラックホールを含む恒星系は衝突系であることによる。 そのようなシミュレイションを現実的な時間で行なうため,今年度はまず,衝突系向き重力多体問題専用機GRAPE6を並列化したシステムを構築した.これには,昨年度の予算で購入した計算機のCPUやマザーボード,ネットーワークを用いた.これにより,ホスト計算機自体の計算速度および並列計算におけるネットワークの速度の両方を速くできるようになった. 本研究では巨大ブラックホールは中〜大質量ブラックホールが高密度恒星系の中で合体しあって形成されるという予想をたて,その予想が正しいかどうか調べている.ブラックホールの合体においては,2体系が衝突合体するのは時間がかかるが,3体系だともっと短時間で合体出来る可能性がある. この可能性を調べるべく,本研究では、3体系の合体の確率,および,恒星系の中にブラックホールが3体以上ある場合の合体の確率を調べる数値計算をすすめた.その結果,ブラックホールが3体ある場合には,2体しかない場合に比べ早く合体できることを確認した.


• Study on Early Evolution of Protostars based on Tree-dimensional Radiative Magnetohydrodynamical Numeroca ; l Simulations

  HANAWA Tomoyuki, TOMISAKA Kohji, MATSUMOTO Tomoaki, INUTSUKA Shu-ichiro, MAKINO Junichiro, NAKAMOTO Taishi

  Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (B), Chiba University, 2003 - 2004

  This project is aimed to study evolution of protostars associated with disks and companions on the basis of numerical simulation in which self-gravity, magnetic field, and radiative transfer are taken into account. We have constructed PC cluster, developed numerical simulation codes employing AMR(adaptive mesh refinement), and published manuals on numerical schemes and data analysis, in order to maintain the basis for our numerical simulation studies. Main scientific achievements are as follows. 1.We have performed three-dimensional numerical simulations of gravitational collapse of rotating magnetized molecular cloud with the nested grid for the first time. We have found that the total of the magnetic and centrifugal forces converges at a certain value at the epoch of the protostar formation irrespectively of the initial magnetic field and rotation. When the centrifugal force dominates over the centrifugal force, the cloud tends to fragment to form binary. 2.We have derived minimum spatial resolution to solve the thermal evolution of two phase gases. The spatial resolution should be smaller than a third of the typical scale length for the heat transfer. 3.We have shown that the primary tends to accrete more gas than the companion. This denies the conventional idea that gas accretion should increase the mass ratio. 4.We have followed gravitational collapse of primordial gas with three-dimensional numerical simulations. The simulations suggest that frequency of binary formation should be high also in population III stars. 5.We have performed one-dimensional numerical simulations of supernova explosion. They show that the supernova explosions promote formation of the second generation stars within 10 thousands years through compression of the surrounding interstellar gas.


• Quantitative Analysis on Dynamics of Development in Research Themesin Interdisciplinary Fields

  FUJIGAKI Yuko, MAKINO Junichiro, SHIRADE Masashi, HIRAKAWA Hideyuki, TOMIZAWA Hiroyuki, HAYASHI Takayuki

  Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (C), The University of Tokyo, 2002 - 2004

  Ron R (Research on Research) is an expanded concept of "Science of Science" that defined by D.S. Price, which means an analysis on research activities. In the field of R on R, it is very important to investigate quantitative and qualitative methodology to analyze the development of interdisciplinary studies. The quantitative method is called Scientometrics. The aim of the present study is to systematization of methodologies of RonR, including Scientometrics. In 2002, investigators shared the new trends in Scientometrics, e.g., trends in International conference, trends in scientific papers in the journal, "Scientometrics", application of scientometrics to evaluation of universities and public research institutes. Base on these information, we discussed how can we systematize the definition, methodologies, and research examples. In 2003, we discussed the table of contents of the textbook which aimed systematization of methodology. We decided to set chapters as database, descriptive statistics, words-analysis, co-words analysis, co-authorship analysis, acknowledgement analysis, contents analysis, and relationships between methods, so that other researchers in Japan can utilize these method using Japanese case data. Furthermore, in 2004, we added the investigation of theories to bridge quantitative and qualitative analysis ; to explain what aspect of real research evaluation is indicated by quantitative data. We also conducted further research applying scientometrics to research evaluation and science and public policy.


• 月の起源-巨大衝突仮説の検証-

  和田 桂一, 小久保 英一郎, 牧野 淳一郎

  日本学術振興会, 科学研究費助成事業, 萌芽研究, 国立天文台, 2002 - 2003

  月がどのように誕生したか、なぜ我々の月は、他の惑星の衛星に比べて極端に大きいのか、は古くからの「謎」であり、多くの仮説が提唱されてきた。その中で、最後に生き残ったシナリオは、原始地球に火星程度の大きさの原始惑星が衝突し、その残骸の周地球円盤から月が形成されたという、「巨大衝突仮説」である。その拠り所の一つが、A.Cameronのグループによって行われてきたSPH法を用いた一連の数値実験であり、最近では、同様の計算手法を用いて、R.Canupらが「巨大衝突仮説」を支持する論文をNatureに掲載した。 一方、我々は、Cameron,Canupらの数値実験は、多くの点で信用できないと考えた。最大の問題は、彼らは低密度領域で精度が悪いSPH法を採用したために、周地球円盤のSPH粒子が高々100個程度しかなく、有効空間分解能が円盤の半径程度しかないという点にある。これでは巨大衝突の際の衝撃波をはじめ物理を正しく扱えていないのは明白である。本研究ではCameronグループの数値計算法とはまったく異なる高精度の3次元Euler-Mesh数値流体コードを用いて、巨大衝突仮説の再検証を行った。周地球円盤領域の格子点数は2000万点を越える。これまで得られた結果からは、原始地球に質量が1/5程度の原始惑星が「かすめるように」衝突することで、月質量の2倍程度の厚い周地球円盤がロッシュ半径内に形成されることが示された。しかし、その円盤の質量、角運動量と、月集積過程のN体実験結果(Kokubo et al. 2001)を用いて予想される月質量は数日のタイムスケールで急激に減少し、このモデルでは現在の月を形成することは困難であることがわかった。これらの結果について、2004年3月22日の日本天文学会春季年会(会場:名古屋大学)の「太陽系」セッションにおいて、和田が「月の起源-本当に巨大衝突で形成されたのか?-」と題する口頭発表を行い、海外専門誌への投稿の準備中である。


• Study on the formation and evolution of galaxies by Large-scale numerical simulations on special-purpose computers.

  MAKINO Junichiro, FUKUSHIGE Toshiyuki, NOMOTO Ken'ichi, SUDO Yasushi, KOKUBO Eiichiro, HABE Asao

  Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (B), The University of Tokyo, 2001 - 2002

  1. We have developed a high-efficiency parallel implementation of the Barnes-Hut tree algorithm on parallel GRAPE system. Using this calculation code, it is now feasible to perform simulations of cosmological structure formation in the spatial scale smaller than clusters of galaxies using 〜 10^8 particles. Only one such simulation has been previously reported. 2. By cosmological simulations with more than 30 million particles, we have determined the slope of the central cusp of the dark-matter halo in CDM cosmology with unprecedented accuracy and reliability. The slope is around -1.4. We have not observed any tendency of the slope to approach to ―1. This slope does not depend on the cosmological models. 3. We have found the reason of the discrepancy between N-body simulations and semi-analytic calculations of the orbital evolution of satellite galaxies. The evolution of the satellite galaxies in recent high-accuracy N-body simulations turned out to be significantly slower than the result of approximate calculations using Chandrasekhar's dynamical friction formula. We found that the discrepancy is not due to the dynamical friction formula itself, but due to the common exercise of taking the size of the parent galaxy as the upper limit for the Coulomb logarithm. By taking the theoretical preferred value, namely the distance of the satellite from the center of the parent galaxy, we resolved the discrepancy. In the case of the satellite from internal degree of freedom, we found that the evolution is faster than that for analytic dynamical friction formula.


• Dynamical Evolution of Steller Systems with Steller Evolution Included

  SUGIMOTO Daiichiro, HACHISU Izumi, NOMOTO Kenichi, INAGAKI Shogo, MIYAMA Shoken, MAKINO Junichiro

  Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (C), University of the Air, 1997 - 1998

  Evolution of selfgravitating systems such as stellar systems was investigated, where the interactions with evolution of each constituent of the system were taken into account. The subjects included phenomena of wide variety such as formation of planets and globular clusters, evolution of the galactic nuclei, as well as the large-scale structure of the universe. Between these different phenomena, common physical processes and their understandings were sought for. Among many accomplishments, the followings were to be noticed. For the globular clusters the direct many-body calculation of dynamical evolution was combined with calculation of stellar evolution. As a result, 1) evaporation of the stars from the globular cluster is found as much slower than the previous estimate with Fokker-Planck approximation, and 2) the merging instability of the stars was shown to occur in young dense star clusters as observed in the Magellanic Clouds (galaxy). The abundance anomaly of the elements as observed in the red-giant branch of globular cluster is shown as related with tidal interaction between the stars in the cluster. For further progress of this research subject, the first importance should be laid in constructing more reliable models for gravitationally interacting hydrodynamic systems consisting of the elements of the system. Typical example is the model of the tidal interaction between the stars. For the galaxies and the clusters of galaxies it will be important to clarify and include the process of star formation, and to make high accuracy simulations possible where numerical dissipation can be avoided.


• The Study of the evolution of star clusters, galaxies, clusters of galaxies by ultra-fast Special-purpose Computer for many-body problem

  SUGIMOTO Daiichiro, EBISUZAKI Toshikazu, TAIJI Makoto, MAKINO Junichiro

  Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Specially Promoted Research, The University of Tokyo, 1992 - 1996

  In this year, we continued the simulation of the evolution of globular clusters, galaxies and clusters of galaxies using GRAPE-4. In addition, we developed a new host interface board for GRAPE-4, which allows use to use faster host computers. For this new host interface board we adopted the PCI bus, which is now available on wide variety of computers from personal computers to supercomputers. We bought high-performance workstations with this PCI interface as new host computers, fast and large tape systems to save the data, and enhanced the memory capacity of host computers Main scientific results of this year include (a) The determination of the structure of the central region of the CDM halo, (b) The study of the evolution of the massive black hole binaries in merging galaxies, and (c) the systematic survey of the effect of encounters to the structure of galaxies in the clusters. Here we briefly summarize (a). Previous simulations of the formation of the dark matter halo in galactic scale typically employed only 20,000-30,000 particles. Because of this small number of particles, the structure within 10 kilo parsec was strongly affected by the two-body relaxation effect, which is not present in real galaxies. We performed the simulation using 786,432 particles, and successfully determined the structure down to 1 kilo parsec. The result is that the inner region is almost isothermal with temperature slightly decreasing inward, which is inconsistent with the observed structure of large elliptical galaxies. This result and the simulation of galaxy merger with central black holes strongly suggest the dynamical effect of massive central objects is crucial to explain the observed structure of large ellipticals.


• High Performance N-Body Computing

  HACHISU Izumi, BONNEL Iwan, HEGGIE Douglas C., INAGAKI Shogo, OHNO Yosuke, FUKUSHIGE Toshiyuki, FUNATO Yoko, UENO Munetaka, TAIJI Makoto, MAKINO Junichiro, EBISUZAKI Toshikazu, SUGIMOTO Daiichiro, CLARKE Cathey, EGGLETON Peter P., WHITE Simon D.M., POLS Onno, AARSETH Sverre J.

  Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Overseas Scientific Survey., University of Tokyo, 1993 - 1993

  We, in Japan side, are making a Tera flops machine for gravitational many body problems. The purpose of this project is to make softwares for our special-purpose Tera flops machines under a cooperation with the UK group. The summary of our 1993 fiscal year project is as follows: 1.Taiji and Hachisu have finished designing a new board for Hermite integrator, which is called HARP-3. A copy of the board will be transferred into Institute of Astronomy, Cambridge University until the end of June, 1994. Aarseth will use the board to develop his Hermite code for our Tera flops machine. 2.Aarseth has stayed at the University of Tokyo from 5th of March to 17th of March, 1994. He succeeded in implementing his Hermite code into our test machine, HARP-2, and proved that the Hermite code is useful to integrate the evolution of collisional N-body systems. 3.Hachisu, Funato, and Inagaki visited the Institute of Astronomy, Cambridge University and discussed with the UK group. We are now developing tools to treat binary evolutions, star captures, and star-star collisions in our N-body code.


• Study on Dynamical Evolution of Dense Stellar Systems with Special Purpose Computers.

  ERIGUCHI Yoshiharu, TEUBEN Peter, HEGGIE Douglas C., VERBUNT Frank, MCMILLAN Stephen, BARNES Joshua, HUT Piet, FUNATO Yoko, OHNO Yosuke, UENO Munetaka, HACHISU Izumi, MAKISHIMA Kazuo, INAGAKI Shogo, MIYAMA Shoken, LARS Hunquist, J.J.MONAGHAN

  Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for international Scientific Research, Univ. of Tokyo, 1991 - 1993

  Academic Year 1991 Dr. Makino visited University of Edinburgh and developed a Hermite integration code for the simulations with the special purpose computer, GRAPE, in collaboration with Drs. Heggie, McMillan, and Aarseth (Cambridge University). This code is simpler and more suitable to GRAPE than the Aarseth code, which has been widely used in the N-body simulations of collisional gravitational systems. Dr.McMillan visited University of Tokyo and implemented his simulation code for stellar cluster to GRAPE-2A in collaboration with Dr.Inagaki. Dr.Hunquist also visited in University of Tokyo and implemented his SPH code to GRAPE-2A. They confirmed that GRAPE systems are suitable to the use of both two codes. Academic Year 1992 Drs.Makino, Hut, and Hunquist systematically investigated the error in the tree code, which is used in collisionless gravitational systems. They found the tree code offers an accuracy high enough for gravitational N-body simulations. Dr.Hachisu developed a vortex dynamics code of incompressible fluid simulations. He found that GRAPE systems can greatly accelerate the vortex dynamics simulations as well as gravitational N-body simulations. Academic Year 1993 We held a workshop on the dynamical evolution of dense stellar systems and the development of special purpose computers to summarize the results of three-years collaborations in Komaba campus University of Tokyo. We concluded that the direct collision of stars plays an important role in dense stellar systems. Drs.Hachisu, Ueno, and Miyama investigated the various types of computational fluid dynamics codes and concluded that the Gudnov type SPH method is most suitable to the special purpose computers for the simulations of self-gravitational fluid. The conceptual and detailed designs of the special purpose computer for SPH were done in collaboration of University of Tokyo and National Astronomical Observatory. In the academic year 1994, we shall make a test board of SPH machine and start to develop a special purpose LSI for the SPH code.


• Numerical Simulations of Collisions of Galaxies by Special Purpose Computer

  EBISUZAKI T., OKUMURA S. K., MAKINO J., SUGIMOTO D.

  Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for General Scientific Research (C), College of Arts and Sciences, University of Tokyo, 1990 - 1991

  In 1990, we purchased a workstation(U-300T)made by Sumitomo Electric Industries and connected it with the GRAPE-1, special purpose computer for gravitational N-body simulations. In 1991, we developed the advanced system, GRAPE-3, in which 48 full-custom LSIs works in parallel. We connected GRAPE-3 with U-300T and achieved an effective speed of 10 Gflops. This speed well exceeds that of the most advanced super computers. Using this GRAPE-3 system- we performed many numerical simulations of collisions of galaxies. We found the followings. First, the dynamical properties of elliptical galaxies are well explained in terms of the mergings of galaxies. We found that the results of the previous simulations are not appropriate because of their small number of particles and their biased initial conditions. We also found that the central black holes well explain the positive correlation between core radius and luminosity of elliptical galaxies. Second, the process in the mergings of galaxies are well explained in terms of waveparticle interactions and phase mixing. We concluded that the so called violent relaxation does not exist, since these two processes are quite different from the relaxation process.


• Research on Evolution of Stellar Systems with Highly Parallelized Special-purpose Computer for Gravitational Many-body Problems

  SUGIMOTO Daiichiro, OKAMURA Sachiko, MAKINO Junichiro, EBISUZAKI Toshikazu

  Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for General Scientific Research (B), University of Tokyo, 1990 - 1991

  In 1990 we constructed GRAPE-1A on a wire-wrapped board. It is a prototype of a special-purpose computer for gravitational many-body problems. In close collaboration with Electronic Imaging and Device Research Laboratory of Fuji XEROX Co., Ltd. we then designed a processor chip on one customized LSI which accommodated all the logics of GRAPE-1A. This LSI is 8x8 mm in size and contains 113, 000 transistors. Using this processor chip we constructed a parallelized machine GRAPE-3 in 1991 : We wired 24 processor chips on a VME board, and connected two boards with the host workstation via appropriately designed interface. The machine was tuned in 1991 to reach the peak performance of 14 Gflops, and the sustained speed of 10 Gflops in solving a gravitational 200, 000body problem. It is faster than the any commercially available supercomputer in 1991 so far as the sustained speed is concerned. Using GRAPE-3 we have done a variety of simulations on evolution of stellar systems, and have found that collision and resultant merging of galaxies play important roles in evolution of galaxies and their clusters. In what follows we summarize the new findings. 1) When two galaxies with central massive black holes collide each other, the black holes suffer from dynamical friction due to the field stars near the apocenter of the orbit. They loose rather their angular momentum than their energy. The eccentricity of the orbit approaches to unity and the black holes may merge quickly. At the same time the field stars aquire energy and become hot. Such picture nicely interprets the relation between the core radius and the total mass of the remnants. 2) During the collision of galaxies the gravitational field changes violently. As a result the stars become throughly mixed in the phase space. On the other hand, in the energy space the mixing proceeds quickly only in the initial phases of their collision and much more slowly afterward. Therefore, it is not appropriate to call such process as the "violent" relaxation. 3) After such process, the stars in the core (or halo) of each galaxy before the collision tend to stay in the core (or halo) of the merger. Therefore, the color gradient observed in giant elliptical galaxies can not testify against the merger hypothesis of their origin. 4) Merging of galaxies proceeds effectively by expelling the angular momentum together with the stars in the halo. Thus, the merging of galaxies may be regarded to be frequent phenomena and may play one of the leading roles in the evolution and history of galaxies and the universe.


• 専用計算機による数値天文学

  Competitive research funding


• Numerical Astrophysics by Special-Purpose Computers

  Competitive research funding