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KAGEYAMA AkiraGraduate School of System Informatics / Department of System InformaticsProfessor
Research activity information
■ Award- Mar. 2021 神戸大学, 令和2年度後期 全学共通教育ベストティーチャー賞
- 2015 H27年度科研費審査委員表彰
- 2013 神戸大学 学長表彰
- 2011 Oscar Buneman Award
- 2010 文部科学大臣表彰 科学技術賞(研究部門)
- 2006 日本学術振興会賞
- 2006 JAMSTEC研究開発功績賞
- 2004 Gordon Bell Prize (Peak Performance)
- 1998 ICNSP Oscar Buneman Award
- 1998 日経サイエンス コンピュータビジュアリゼーションコンテスト 優秀賞
- 1996 第12回 井上研究奨励賞
- Last, Japan Society of Plasma Science and Nuclear Fusion Research, Nov. 2024, Plasma and Fusion Research, 19, n/a - n/aScientific journal
- Japan Society of Plasma Science and Nuclear Fusion Research, Jul. 2024, Plasma and Fusion Research, 19, 1401024 - 1401024Scientific journal
- Last, 2023, Proc. SIMULTEC, 332 - 339[Refereed]International conference proceedings
- Last, 2023, Plasma and Fusion Research, 18, 2401045[Refereed]Scientific journal
- Last, Springer Nature Singapore, Oct. 2022, Methods and Applications for Modeling and Simulation of Complex Systems (CCIS, AsiaSim 2021), 1636, 3 - 10[Refereed]In book
- American Physical Society (APS), Jan. 2022, Physical Review Fluids, 7(1) (1), English[Refereed]Scientific journal
- 2022, Proc. JSST2022, 262 - 265VOIR: Interactive Visualization Software for Head-Mounted Display Devices[Refereed]International conference proceedings
- Last, 2022, Proc. JSST2022, 355 - 358In-situ Visualization of 3-D Cellular Automata[Refereed]International conference proceedings
- Last, 2022, J. Adv. Simul. Sci. Eng., 9, 220 - 230Autonomous camera for agent-based in situ visualization[Refereed]Scientific journal
- Last, Springer Science and Business Media LLC, Aug. 2021, Earth, Planets and Space, 73(1) (1), 158, English
Abstract The visualization of computer simulations is currently undergoing a transition from post-hoc to in-situ visualization in which visualization processes are applied, while the simulation is running. The selection of an appropriate method or tool is essential to efficiently perform in-situ visualization in parallelized large-scale computer simulations that run on supercomputers. Although some generic in-situ visualization libraries are available, they are overengineered for certain geophysical simulations. In this study, we focus on spherical simulations using the Yin-Yang grid. Computer simulations that use the Yin-Yang grid are gaining popularity in geophysics. We propose an in-situ visualization method dedicated to the Yin-Yang grid simulations and demonstrate its effectiveness through sample simulations.[Refereed]Scientific journal - We propose a new visualization method for massive supercomputer simulations. The key idea is to scatter multiple omnidirectional cameras to record the simulation via in situ visualization. After the simulations are complete, researchers can interactively explore the data collection of the recorded videos by navigating along a path in four-dimensional spacetime. We demonstrate the feasibility of this method by applying it to three different fluid and magnetohydrodynamics simulations using up to 1,000 omnidirectional cameras.PeerJ, Nov. 2020, PeerJ Computer Science, 6, e305 - e305[Refereed]Scientific journal
- Lead, Japan Society of Plasma Science and Nuclear Fusion Research, Sep. 2020, Plasma and Fusion Research, 15(0) (0), 1401065 - 1401065[Refereed]Scientific journal
- プラズマ・核融合学会編集委員会, 2020, プラズマ・核融合学会誌, 96(4) (4), 199 - 206, Japanese4次元ストリートビュー:計算機シミュレーションの新しい可視化法[Refereed]Scientific journal
- 2020, Journal of Advanced Simulation in Science and Engineering, 7, 15 - 33, English[Refereed]Scientific journal
- Nov. 2019, The 38th JSST Annual International Conference on Simulation Technology (JSST2019), 27 - 30, EnglishAn Interactive Visualization Toolkit for Yin-Yang-Zhong Grid Dataset[Refereed]International conference proceedings
- 2019, Journal of Advanced Simulation in Science and Engineering, 6, 234 - 248Development of CAVELib Compatible Library for HMD-type VR Devices[Refereed]
- 2019, Lecture Notes in Computer Science, Proc. ICC S2019, 588 - 594[Refereed]
- SciTePress, Sep. 2018, Proceedings of 8th International Conference on Simulation and Modeling Methodologies, Technologies and Applications (SIMULTECH 2018),, 106 - 118, English[Refereed]International conference proceedings
- 2018, Proc. 37th JSST Annual International Conference on Simulation Technology, 372 - 375, Englishefpp: A Preprocessor for Modern Fortran[Refereed]
- 2018, Communications in Computer and Information Science (AsiaSim 2018), 946, 439 - 448[Refereed]
- Dec. 2017, International Journal of Modeling, Simulation, and Scientific Computing (IJMSSC), 9(3) (3), online - 20, English[Refereed]Scientific journal
- 可視化情報学会, 2017, 可視化情報, 37(146) (146), 14 - 19, JapaneseHMD型VR装置を用いたインタラクティブ可視化Scientific journal
- 2016, Contributions to Plasma Physics, 56(6-8) (6-8), 692 - 697, English[Refereed]Scientific journal
- World Scientific Publishing Co. Pte Ltd, 2016, International Journal of Modeling, Simulation, and Scientific Computing, 7(4) (4), 1643001, English[Refereed]Scientific journal
- Elsevier B.V., 2016, Proceedings of JSST 2016, 80, 1374 - 1381, English[Refereed]International conference proceedings
- Elsevier B.V., 2016, Procedia Computer Science, 80, 1374 - 1381, English[Refereed]Scientific journal
- 2016, Proceedings of SIMULTECH 2016, 239 - 243, EnglishMagnetohydrodynamics Simulation in a Sphere by Yin-Yang-Zhong Grid[Refereed]International conference proceedings
- 2016, Journal of Visualization, 19(2) (2), 319 - 326, English[Refereed]Scientific journal
- 2016, Journal of Visualization, 19(3) (3), 417 - 422, English[Refereed]Scientific journal
- Jan. 2016, Journal of Computational Physics, 305, 895 - 905, English[Refereed]Scientific journal
- Jun. 2015, Astrophysical Journal, 806(1) (1), 10, English[Refereed]Scientific journal
- 2015, 第 29 回数値流体力学シンホ?シ?ウム, (C02-3) (C02-3), Japanese流れを伴う球内MHD緩和Symposium
- 2015, 第 29 回数値流体力学シンホ?シ?ウム, (C02-2) (C02-2), Japanese薄い球殻内の熱対流と MHD タ?イナモSymposium
- 2015, 第 29 回数値流体力学シンポジウム, (C04-4) (C04-4), Japanese全球計算格子「イン=ヤン=ゾン」Symposium
- 2015, 第 29 回数値流体力学シンホ?シ?ウム, (C02-4) (C02-4), Japanese差動回転のヒステリシスと太陽型―反太陽型遷移の臨界値Symposium
- 2015, Proceedings of The 15th Asia Simulation Conference 2015, EnglishMultiverse: A Software Framework for Visualization in CAVE Virtual Reality Systems[Refereed]International conference proceedings
- The Japan Society of Plasma Science and Nuclear Fusion Research, 2015, Plasma and Fusion Research, 10, 1201087 - 1201087, English
Recent advances in head mounted display (HMD) systems, specifically those demonstrated by the Oculus Rift, provide a new platform for three-dimensional scientific visualization. Taking advantage of this opportunity, we have constructed a cost-effective video see-through visualization system by combining a stereoscopic camera system and an Oculus Rift device. The see-through HMD system enables a researcher to analyze numerical data in a virtual reality space, with keeping visual communication with nearby collaborators in real space. We have ported our visualization software for CAVE systems, VFIVE, to the HMD system. The ported software enables its user to analyze three-dimensional scalar/vector fields in a virtual reality space while simultaneously being able to view the natural surroundings.
[Refereed]Scientific journal - Springer Verlag, 2015, Journal of Visualization, 19(3) (3), 417 - 422, English[Refereed]Scientific journal
- Springer Verlag, 2015, Journal of Visualization, 19(2) (2), 319 - 326, English[Refereed]Scientific journal
- Apr. 2014, GEOCHEMISTRY, GEOPHYSICS, GEOSYSTEMS, 15(4) (4), 1642 - 1647, English[Refereed]Scientific journal
- 神戸大学大学院工学研究科, 2014, Memoirs of the Graduate Schools of Engineering and System Informatics Kobe University, 6, 25 - 28, English[Refereed]Research institution
- 2014, Computer Physics Communications, 185(1) (1), 79 - 85, English[Refereed]Scientific journal
- To analyze large scale 3-dimensional data, the modern virtual reality (VR) technology will play important roles in future simulation studies. Various VR visualization programs have been developed to date, including our original VR visualization software VFIVE. However, almost all of the previous VR software are based on CAVElib, which is a de facto standard commercial library fJapan Society for Simulation Technology, May 2013, 日本シミュレーション学会論文誌, 4(4) (4), 190 - 193, English[Refereed]Scientific journal
- 2013, 兵庫県機械技術研究会, 312, Japanese地磁気・計算・仮想現実Symposium
- 2013, 第47回光学五学会関西支部連合講演会, Japanese計算機シミュレーションと可視化Symposium
- 2013, 九州大学応用力学研究所研究集会報告, 24AO-S3, 20 - 34, Japaneseシミュレーションデータの二つの可視化手法Symposium
- A high-speed rendering method for three-dimensional animated volume rendering in a CAVE visualization environment is developed. The proposed method accelerates the standard three-dimensional texture-slicing approach to volume rendering by making use of asynchronous data transfer with the pixel buffer object of graphics processors. The method enables stereoscopic animation of volume rendering at five frames per second for scalar data of 5123 grid points in a four-screen CAVE system.The Japan Society of Plasma Science and Nuclear Fusion Research, 2013, Plasma and Fusion Resarch, 8(1201135) (1201135), 1201135 - 1201135, English[Refereed]Scientific journal
- 神戸大学大学院工学研究科, 2013, Meroirs of the Graduate School of Engineering and System Informatics Kobe University, 5, 7 - 9, English[Refereed]Research institution
- World Scientific Publishing Co. Pte Ltd, 2013, International Journal of Modeling,Simulation and Scientific Computing, 4(1340004) (1340004), English[Refereed]Scientific journal
- World Scientific Publishing Co. Pte Ltd, 2013, International Journal of Modeling,Simulation and Scientific Computing, 4(1340003) (1340003), English[Refereed]Scientific journal
- 2013, Journal of Physics:Conference Series, 454(12077) (12077), English[Refereed]International conference proceedings
- 2013, Astrophysical Journal, 778(1) (1), English[Refereed]Scientific journal
- To analyze large scale 3-dimensional data, the modern virtual reality (VR) technology will play important roles in future simulation studies. Various VR visualization programs have been developed to date, including our original VR visualization software VFIVE. However, almost all of the previous VR software are based on CAVElib, which is a de facto standard commercial library for VR environments. To replace the basic API from CAVElib, we are developing a new visualization software based on VR Juggler which is an open source free software library. Our program design and implemented visualization methods are reported in this paper.Japan Society for Simulation Technology, Sep. 2012, Proceedings of International Conference on Simulation Technology (JSST 2012), 4(4) (4), 387 - 389, English[Refereed]International conference proceedings
- Sep. 2012, Proceedings of International Conference on Simulation Technology (JSST 2012), 394 - 397, EnglishPlasma Physics and Fusion Science by Virtual-Reality System[Refereed]International conference proceedings
- Sep. 2012, Proceedings of International Conference on Simulation Technology (JSST 2012), 86 - 89, EnglishInteractive Visualization by Camera Cluster[Refereed]International conference proceedings
- Sep. 2012, Proceedings of International Conference on Simulation Technology (JSST 2012), 398 - 402, EnglishImmersive 4D Volume Visualization in CAVE[Refereed]International conference proceedings
- Sep. 2012, Proceedings of International Conference on Simulation Technology (JSST 2012), 390 - 393, EnglishDevelopment of Mesh Modification System for Finite Element Simulations Using CAVE Environments[Refereed]International conference proceedings
- Sep. 2012, Proceedings of International Conference on Simulation Technology (JSST 2012), 310 - 314, EnglishA Multigrid Poisson Solver for Yin-Yang Grid[Refereed]International conference proceedings
- 2011, 第16回日本バーチャルリアリティ学会大会論文集, vol.16, pp.69-72, Japanese没入型VRシステムπ-CAVEとアプリケーションランチャーの開発Scientific journal
- 2011, スーパーコンピューティングニュース, vol.13, pp.5-13, Japanese地球ダイナモの新しいシミュレーションコード開発とその応用Scientific journal
- 2011, 第40回可視化情報シンポジウム論文集, Japaneseトレーサー曲線による流れ場のバーチャルリアリティ可視化,Scientific journal
- 2011, スーパーコンピューティングニュース, vol.13, pp.34-45, JapaneseVR Juggler による 3 次元可視化Scientific journal
- 2011, Proc. International Symposium on Disaster Simulation & Structural Safety in the Next Generation (DS'11),, pp.287-289, EnglishImmersive Visualization in π-CAVEScientific journal
- 2011, Plasma and Fusion Research,, vol.6, 2406023(1 SPECIAL ISSUE) (1 SPECIAL ISSUE), English[Refereed]Scientific journal
- 2011, Plasma and Fusion Research, vol.6, 2406027(1 SPECIAL ISSUE) (1 SPECIAL ISSUE), English[Refereed]Scientific journal
- 2011, Physics of Plasmas, 18(7) (7), English[Refereed]Scientific journal
- 2011, Ieee Transactions on Plasma Science, 39(11) (11), 2472 - 2473, English[Refereed]Scientific journal
- 可視化情報学会, Oct. 2010, 可視化情報, vol.30, Suppl. No.2, 361 - 366, Japanese液体金属熱対流シミュレーションとその可視化Scientific journal
- Sep. 2010, スーパーコンピュータニュース, vol.12, special issue,, Japanese地球ダイナモの新しいシミュレーションコード開発とその応用Scientific journal
- Aug. 2010, Nature, vol.463, pp.793-796(7282) (7282), 793 - U102, English[Refereed]Scientific journal
- 日本計算工学会, 2010, Proceedings of 10th International Conference on Construction Applications of Virtual Reality, pp.435-442(2) (2), 1055 - 1058, EnglishDevelopment of an interactive visualization system using technology for flow simulation[Refereed]Scientific journal
- 2010, Proceedings of 10th International Conference on Construction Applications of Virtual Reality, pp.367-374, EnglishApplication of Virtual Reality Technology to Pre-Processing for 3-D Finite Element Simulations[Refereed]Scientific journal
- 2010, Computer Physics Communications, 181(4) (4), 720 - 725, English[Refereed]Scientific journal
- 土木学会, 2009, 2009年度土木情報利用技術講演集, vol.34, pp.45-48, 45 - 48, Japanese非構造格子に基づく流れ解析のためのVR技術に基づく対話的可視化システムの構築International conference proceedings
- 低エクマン数領域における地球ダイナモシミュレーションWe performed MHD geodynamo simulations with low Ekman number Ek=O(10E-7), which is the lowest value yet achieved. We found that the convection, magnetic fields and current fields structure are different compared with higher Ekman number cases. The convection is made of thin sheet plumes. By dynamo action under this convection motion, magnetic flux tubes are formed. Also helical current coils and some current tori are formed. Purely zonal flow is formed around the end of the plume.日本流体力学会, 2009, 九州大学応用力学研究所研究集会報告, 20ME-S6, pp.69-78, 377 - 377, JapaneseInternational conference proceedings
- 2009, 第23回数値流体力学シンポジウム集録, C7-4, pp.1-4, JapaneseVR技術を用いた非構造格子に基づく対話的可視化システムの構築International conference proceedings
- 2009, スーパーコンピューティングニュース, vol.11, No.Special Issue 2, pp(2) (2), 33 - 42, JapaneseHA8000システムでの地球ダイナモシミュレーションScientific journal
- 分子シミュレーション研究会, 2009, 分子シミュレーション研究会会誌 アンサンブル, vol.11, No.2, pp.51-57(2) (2), 2_51 - 2_57, JapaneseInternational conference proceedings
- 2009, 埼玉大学情報メディア基盤センター年報 さいたま, vol.17, pp.52-53, JapaneseCAVEを用いた有限要素法メッシュの対話的修正International conference proceedings
- 2009, Proc. 9th International Conference on Construction Applications of Virtual Reality 2009, pp.315-322, ISBN 978-1-74210-1, EnglishApplication of VR Technique to Pre- and Post-Processing for Wind Flow Simulation in Urban Area[Refereed]International conference proceedings
- 2009, Physics of the Earth and Planetary Interiors, 176(1月2日) (1月2日), 44 - 53, English[Refereed]Scientific journal
- 2009, Computer Physics Communications, 180(9) (9), 1534 - 1538, English[Refereed]Scientific journal
- 2008, Nature, 454(7208) (7208), 1106 - 1109, English[Refereed]Scientific journal
- 2008, Physics of the Earth and Planetary Interiors, 171(1月4日) (1月4日), 19 - 32, English[Refereed]Scientific journal
- 2008, Journal of Computational Physics, 227(10) (10), 4977 - 4997, English[Refereed]Scientific journal
- 2007, Physics of the Earth and Planetary Interiors, 163(1月4日) (1月4日), 305 - 311, English[Refereed]Scientific journal
- The Visualization Society of Japan, 2007, 可視化情報学会誌, 27(105) (105), Plate43 - Plate43, Japanese
- The Visualization Society of Japan, 2007, 可視化情報学会誌, 27(105) (105), Plate42 - Plate42, Japanese
- The Visualization Society of Japan, 2007, 可視化情報学会誌, 27(105) (105), Plate40 - Plate40, Japanese
- Feb. 2006, Geochem. Geophys. Geosyst., 7(2) (2), n/a, English[Refereed]Scientific journal
- 2006, Computers & Geosciences, 32(2) (2), 265 - 269, English[Refereed]Scientific journal
- 2006, Journal of Plasma Physics, 72(6) (6), 1065 - 1068, English[Refereed]Scientific journal
- 2006, Geochemistry Geophysics Geosystems, 7(2) (2), English[Refereed]Scientific journal
- 2006, Journal of Geophysical Research-Solid Earth, 111(B3) (B3), English[Refereed]Scientific journal
- 2006, Journal of Plasma Physics, 72, 945 - 948, English[Refereed]Scientific journal
- 2006, Journal of Plasma Physics, 72(6) (6), 841 - 844, English[Refereed]Scientific journal
- 2006, Journal of Plasma Physics, 72(6) (6), 1069 - 1072, English[Refereed]Scientific journal
- 2005, Journal of Physics: Conference Series, 16(1) (1), 325 - 338, English[Refereed]International conference proceedings
- 2005, Journal of Computational Physics, 206(1) (1), 162 - 181, English[Refereed]Scientific journal
- 2005, 3rd M.I.T. Conference on Computational Fluid and Solid Mechanics, 688 - 692[Refereed]
- 2005, ArXivScientific journal
- For interactive data analysis of large scale simulations, we are developping a virtual reality (VR) visualization software called VFIVE. VFIVE uses OpenGL and CAVE library to generate and interact with virtual objects in a CAVE VR system "BRAVE" installed in the Earth Simulator Center. The development of VFIVE and its application to geoscientific data obtained by computer simulation on the Earth Simulator is described.The Visualization Society of Japan, Jul. 2004, Transactions of Visualization Society of Japan, 24(1) (1), 319 - 320, Japanese
- Institute of Electrical and Electronics Engineers Inc., 2004, Proceedings of the ACM/IEEE SC 2004 Conference: Bridging Communities, 463 - 471, English[Refereed]International conference proceedings
- 2004, Geochemistry Geophysics Geosystems, 5(9) (9), English[Refereed]Scientific journal
- 2004, Geophysical Research Letters, 31(12) (12), English[Refereed]Scientific journal
- 2004, Mhd Couette Flows: Experiments and Models, 733, 21 - 34, EnglishMagnetorotational instability in a short couette flow of liquid gallium[Refereed]International conference proceedings
- 2004, Journal of the Physical Society of Japan, 73(9) (9), 2424 - 2437, English[Refereed]Scientific journal
- Office of Scientific and Technical Information ({OSTI}), Jul. 2003[Refereed]
- 2002, Science, 295(5561) (5561), 1887 - 1890, English[Refereed]Scientific journal
- Office of Scientific and Technical Information ({OSTI}), Mar. 2001[Refereed]
- 2001, Monthly Notices of the Royal Astronomical Society, 325(2) (2), L1 - L5, English[Refereed]Scientific journal
- 2001, Computer Physics Communications, 142(1月3日) (1月3日), 227 - 230, English[Refereed]Scientific journal
- Yukawa Institute for Theoretical Physics, 2000, Progress of Theoretical Physics Supplement, (138) (138), 657 - 664, English[Refereed]Scientific journal
- 2000, Progress of Theoretical Physics Supplement, (138) (138), 716 - 717, English[Refereed]Scientific journal
- 2000, Progress of Theoretical Physics Supplement, (138) (138), 665 - 673, English[Refereed]Scientific journal
- One of the most practical objectives to use the virtual reality system in science is to make it easy to intuitively percept complex physical phenomena. We developed a virtual reality system, called CompleXcope, which can represent "real" 3D visual environment. Since attractive physical phenomena are often so complex and tangled, the virtual reality system with 3D-sound functions is really useful for the quick comprehension of phenomena. We have recently added a sound function to the CompleXcope. In this paper we present examples produced by this aural-visual virtual reality system "CompleXcope".THE VIRTUAL REALITY SOCIETY OF JAPAN, 2000, Transactions of the Virtual Reality Society of Japan, 5(3) (3), 943 - 948, Japanese
- 1999, Journal of Plasma Physics, 61(3) (3), 407 - 414, English[Refereed]Scientific journal
- 1999, Physics of Plasmas, 6(2月3日) (2月3日), 777 - 787, English[Refereed]Scientific journal
- 1999, Physics of Plasmas, 6(3) (3), 771 - 776, English[Refereed]Scientific journal
- 1999, Physical Review Letters, 82(26) (26), 5409 - 5412, English[Refereed]Scientific journal
- CompleXcope is a CAVE VR system installed at Theory and Computer Simulation Center, National Institute for Fusion Science. The purpose of the CompleXcope system is the scientific visualization and the interactive three-dimensional data analysis of supercomputer simulations on three-dimensional complex phenomena including nuclear fusion plasma, fluid dynamics, molecular dynamics of polymers. Several elemental visualization modules for three-dimensional data analysis of scalar and vector fields in a virtual space are developed by OpenGL and the CAVE library. Combining these modules, CompleXcope application programs are developed and actively used in physics research.THE VIRTUAL REALITY SOCIETY OF JAPAN, 1999, Transactions of the Virtual Reality Society of Japan, 4(4) (4), 717 - 722, English
- 1998, Hot Universe, (188) (188), 209 - 210, EnglishThree-dimensional simulation study of plasmoid injection into magnetized plasma[Refereed]Scientific journal
- Apr. 1997, Phys. Rev. E, 55(4) (4), 4617 - 4626, English[Refereed]Scientific journal
- 1997, Journal of the Physical Society of Japan, 66(12) (12), 3826 - 3830, English[Refereed]Scientific journal
- 1997, Icpp 96 Contributed Papers - Proceedings of the 1996 International Conference on Plasma Physics, Vols 1 and 2, 850 - 853, EnglishAuto-oscillations in a continuously twisted magnetic flux tube[Refereed]International conference proceedings
- 1997, Plasma Physics and Controlled Fusion, 39(5A) (5A), 83 - 91, English[Refereed]Scientific journal
- 1997, Icpp 96 Contributed Papers - Proceedings of the 1996 International Conference on Plasma Physics, Vols 1 and 2, 14 - 17, EnglishFormation of wave patterns and potential structures due to current-driven electrostatic ion-cyclotron instability[Refereed]International conference proceedings
- 1997, Physics of Plasmas, 4(8) (8), 2886 - 2892, English[Refereed]Scientific journal
- 1997, Physical Review E, 55(4) (4), 4617 - 4626, English[Refereed]Scientific journal
- 1997, Icpp 96 Contributed Papers - Proceedings of the 1996 International Conference on Plasma Physics, Vols 1 and 2, 482 - 485, EnglishImpulsive relaxation process in MHD driven reconnection[Refereed]International conference proceedings
- 1997, Icpp 96 Contributed Papers - Proceedings of the 1996 International Conference on Plasma Physics, Vols 1 and 2, 1574 - 1577, EnglishKinetic self-organization process: super ion-acoustic double layer formation and particle acceleration[Refereed]International conference proceedings
- 1997, Icpp 96 Contributed Papers - Proceedings of the 1996 International Conference on Plasma Physics, Vols 1 and 2, 374 - 377, EnglishParticle-MHD simulations of the hybrid kinetic-MHD modes[Refereed]International conference proceedings
- 1997, Icpp 96 Contributed Papers - Proceedings of the 1996 International Conference on Plasma Physics, Vols 1 and 2, 838 - 841, EnglishSimulation study of the structural formation in thermodynamically closed systems[Refereed]International conference proceedings
- 1997, Physics of Plasmas, 4(5) (5), 1569 - 1575, English[Refereed]Scientific journal
- 1997, Physical Review E - Statistical Physics, Plasmas, Fluids, and Related Interdisciplinary Topics, 55(4) (4), 4617 - 4626, English[Refereed]Scientific journal
- 1996, Journal of the Physical Society of Japan, 65(10) (10), 3208 - 3214, English[Refereed]Scientific journal
- 1996, Physics of Plasmas, 3(5) (5), 2135 - 2142, English[Refereed]Scientific journal
- 1996, Physics of Plasmas, 3(6) (6), 2265 - 2274, English[Refereed]Scientific journal
- 1996, Physics of Plasmas, 3(7) (7), 2821 - 2823, English[Refereed]Scientific journal
- 1995, Physics of Plasmas, 2(5) (5), 1421 - 1431, English[Refereed]Scientific journal
- 1995, Physics of Plasmas, 2(5) (5), 1421 - 1431, English[Refereed]Scientific journal
- 1995, Physical Review E, 51(5) (5), R3838 - R3841, English[Refereed]
- 1995, Physics of Plasmas, 2(10) (10), 3609 - 3613, English[Refereed]Scientific journal
- 1995, Physical Review E, 51(5) (5), R3838 - R3841, English[Refereed]Scientific journal
- 1993, Journal of Geophysical Research-Space Physics, 98(A5) (A5), 7503 - 7517, English[Refereed]Scientific journal
- 1993, Physics of Fluids B-Plasma Physics, 5(8) (8), 2793 - 2805, English[Refereed]Scientific journal
- 1992, Journal of Geophysical Research-Space Physics, 97(A4) (A4), 3929 - 3943, English[Refereed]Scientific journal
- 1992, Plasma Physics and Controlled Fusion, 34(13) (13), 2031 - 2037, English[Refereed]Scientific journal
- Mar. 2021, 山田化学振興財団 財団ニュース, 85(2) (2), 15 - 15持ち札は多いほうが良い(特集 2020年の基礎研究)Introduction other
- プラズマ・核融合学会編集委員会, Oct. 2020, プラズマ・核融合学会誌 = Journal of plasma and fusion research / プラズマ・核融合学会編集委員会 編, 96(10) (10), 627 - 633, Japanese可視化技術—Visualization Technology—プロジェクトレビュー 核融合科学研究所における数値実験炉研究プロジェクト ; 基礎物理シミュレーション研究と可視化技術の進展
- 2019, 33回数値流体力学シンポジウム, B12-5動画ベースの可視化手法 4 次元ストリートビューSummary national conference
- 2019, 第33回数値流体力学シンポジウム, D06-4ねじれた水流の形成Summary national conference
- 2019, 第33回数値流体力学シンポジウム, B12-3Yin-Yang 格子用 In-Situ 可視化ツールの開発Summary national conference
- 2019, 技術情報誌 TELECOM FRONTIER, 105, 1 - 5計算機シミュレーションの対話的同時可視化手法
- Center for Earth Information Science and Technology, Japan Agency for Marine-Earth Science and Technology, Apr. 2016, Annual report of the earth simulator, 227 - 231, JapaneseDevelopment of Advanced Simulation Methods for Solid Earth Simulations
- Center for Earth Information Science and Technology, Japan Agency for Marine-Earth Science and Technology, Apr. 2016, Annual report of the earth simulator, 337 - 342, JapanesePlanetary Dynamo Simulations with Huge Inner Core
- 日本流体力学会, Apr. 2016, ながれ, 35(2) (2), 127 - 131, JapaneseDifferential rotation in stellar convection zone
- Geodynamo Simulation in the Past, Now, and Future地球内部の大部分を占めるマントル層の下には外核と呼ばれる液体鉄の領域がある.液体鉄は電気伝導性の流体なので,外核の流れと磁場は磁気流体力学(MHD)方程式に従う.この液体鉄を媒質としたMHDダイナモ過程により,地球磁場(地磁気)が作られている.長い歴史をもつ地磁気の研究は,計算機シミュレーションの手法が導入された1990年代半ば,飛躍的に発展し,その後もスーパーコンピュータの進歩に伴って着実に進歩してきた.MHDシステムとしての地球外核の特徴の一つは,地球の回転(自転)が流れに及ぼす影響の強さである.その強さはEkman数とよばれる無次元量で示される.本章では,地球ダイナモの特徴を概観し,シミュレーションで実現されたEkman数の漸進という視点からまとめた地球ダイナモシミュレーション研究の成果を紹介する.プラズマ・核融合学会, Oct. 2015, プラズマ・核融合学会誌, 91(10) (10), 676 - 682, Japanese
- プラズマ・核融合学会, Sep. 2015, プラズマ・核融合学会誌, 91(9) (9), 597 - 602, JapaneseMHD Dynamo : Spontaneous Generation of Magnetic Field by Flows(1)What is MHD Dynamo?
- 日本計算工学会, Jun. 2015, 計算工学講演会論文集 Proceedings of the Conference on Computational Engineering and Science, 20, 4p, JapaneseImprovement of applicability of 3D unstructured mesh modification system based on VR Technology
- 2015, プラズマ・核融合学会誌, 91(11) (11), 727 - 728, Japanese講座「MHDダイナモ:流れによる磁場の自発的生成」 第6章 「まとめ」Introduction scientific journal
- 2015, プラズマ・核融合学会誌, 91(10) (10), 597 - 602, Japanese講座「MHDダイナモ:流れによる磁場の自発的生成」 第3章 「地球ダイナモ研究のこれまでとこれから」Introduction scientific journal
- 2015, プラズマ・核融合学会誌, 91(9) (9), 676 - 682, Japanese講座「MHDダイナモ:流れによる磁場の自発的生成」 第1章 「MHDダイナモとは何か」Introduction scientific journal
- Earth Simulator Center, Japan Agency for Marine-Earth Science and Technology, Apr. 2013, Annual report of the Earth Simulator Center, 91 - 95, EnglishDevelopment of Advanced Simulation Methods for Solid Earth Simulations
- The Physical Society of Japan (JPS), 26 Mar. 2013, Meeting abstracts of the Physical Society of Japan, 68(1) (1), 255 - 255, Japanese26aEA-6 Magnetic Field Amplification by the Nonlinear Evolution of Three-Dimensional Richtmyer-Meshkov Instability
- F101 Interactive Visualization of Scientific Data with the Largest Immersive Virtual Reality System in Japanスーパーコンピュータで実行される計算機シミュレーションの複雑化と大規模化は今後ますます進むであろう。従ってデータ可視化にも新しい技術の積極的な導入が必要とされる.3次元シミュレーションのデータは3次元のまま可視化し,解析することが望ましい.シミュレーション研究者にとって理想的な可視化環境とは,自分の計算機シミュレーションの世界に自分の体ごと没入し,そのデータを自分の手で直接操作することを可能にするような環境であろう.最新の没入型バーチャルリアリティ装置を使えば,そのような理想的なデータ可視化環境を程度実現することが可能である.本講演では,神戸大学統合研究拠点に導入された没入型バーチャルリアリティ装置『π-CAVE』と,そこに実装した様々な可視化ソフトウェアについて紹介する.The Japan Society of Mechanical Engineers, 06 Oct. 2012, The Computational Mechanics Conference, 2012(25) (25), "F - 1"-"F-3", Japanese
- 可視化情報学会, Oct. 2012, 可視化情報学会誌 = ournal of the Visualization Society of Japan, 32(127) (127), 144 - 149,図巻頭2p, JapaneseDevelopment of Visualization Tools for Large-scale Geoscience Simulations : Toward Efficient Visualization Analysis for Earthquakes, Tsunami and Typhoon Simulations using K computer
- 土木学会, 2012, 土木情報学シンポジウム講演集 = Proceedings of the symposium on civil engineering informatics, 37, 139 - 142, JapaneseDevelopment of a 3D Mesh Correction System Using Virtual Reality Technology
- 可視化情報学会, 2012, 可視化情報学会誌 = ournal of the Visualization Society of Japan, 32(1) (1), 57 - 60, JapaneseA New Style of Visualization of Simulation Data : Interactive Movie Play of Fixed View Point Movies
- Geodynamo Simulation and its Visualization by Virtual Reality Technology地球は巨大な発電機である。地球内部のコアと呼ばれる領域にある液体金属が対流運動し、その流れが電磁誘導を通じて自発的に10億アンペアの西向きリング状電流(即ち双極子磁場)を作り出している。コンパスが北を指すのはこのためである。さらにこのリング状電流は数十万年に一度、突然向きを反転させることが知られている。双極子磁場の自発的な生成と逆転というこのような地磁気の興味深い性質は、磁気流体力学(MHD,Magnetohydrodynamics)方程式の時間発展を数値的に解く、地球ダイナモシミュレーションと呼ばれる手法により計算機の中で再現されている。地球ダイナモシミュレーションの概要と、これまでに得られた成果、並列スーパーコンピュータを駆使した大規模計算を実現するためのシミュレーション技術的な工夫について述べ、さらに、その計算結果を3次元的に解析するために導入したバーチャルリアリティ技術、及びそれを応用した3次元的・対話的・没入的な可視化手法の開発についても紹介する。The Japan Society of Mechanical Engineers, 08 Oct. 2011, The Computational Mechanics Conference, 2011(24) (24), "特 - 6"-"特-10", Japanese
- 日本計算工学会, May 2011, 計算工学講演会論文集 Proceedings of the Conference on Computational Engineering and Science, 16, 4p, JapaneseDevelopment of an Interactive Visualization System Using CAVE System for Flow Simulation
- The Physical Society of Japan (JPS), 03 Mar. 2011, Meeting abstracts of the Physical Society of Japan, 66(1) (1), 231 - 231, Japanese25aGW-6 Integrated Visuallization of Simulation and Experimental Device Data in Virtual-Reality Space
- 可視化情報学会, 2011, 可視化情報学会誌, 31(1) (1), 85 - 88, JapaneseVisualization of Simulation Data with Immersive Virtual Reality Systems
- The Japan Society for Industrial and Applied Mathematics, 2011, 応用数理, vol.21, no.1, pp.55-57(1) (1), 55 - 57, JapaneseOthers
- 2011, 第50回プラズマ若手夏の学校 テキスト, Japaneseプラズマ数値計算Others
- 2011, Annual Report of National Institute for Fusion Science, April 2010-March 2011, p.382, EnglishMHD Dynamo SimulationOthers
- Nov. 2010, Annual Report of National Institute for Fusion Science, April 2009-March 2010, EnglishZonal Flow Formation in Geodynamo SimulationsOthers
- 可視化情報学会, 2010, Journal of the Visualization Society of Japan, 30, 367 - 372, JapaneseVisualization software of spherical data for space weather modeling
- 可視化情報学会, 2010, Journal of the Visualization Society of Japan, 30, 309 - 314, JapaneseVR visualization of flow with tracer line method
- 2010, システム/制御/情報, vol.54, no.2, pp.51-57, JapaneseIntroduction scientific journal
- The Physical Society of Japan (JPS), 03 Mar. 2009, Meeting abstracts of the Physical Society of Japan, 64(1) (1), 223 - 223, Japanese28pSA-6 Geodynamo simulation with low Ekman number : zonal flow formation
- Mar. 2009, Meeting Abstracts of the Physical Society of Japan, Issue 2, 64(1) (1), 191 - 191, JapaneseSummary national conference
- The operation of the Earth Simulator started in March, 2002, and 7 years have passed. For these years, the Earth Simulator has been used by not only researchers of JAMSTEC but also many researchers of the domestic and international institutions, and many remarkable results have been made. The Earth Simulator Center was established at the same time as the birth of the Earth Simulator. The researchers of the Earth Simulator Center have also developed new simulation technologies.The simulation is the only one method by which we can predict the future scientifically. Therefore, it has the important role in the science as well as the technology which can contribute to the life of the people, and has the important meaning in modeling the future of the human beings.Japan Agency for Marine-Earth Science and Technology, 2009, JAMSTEC Report of Research and Development, 9(1) (1), 1_75 - 1_135
- 2009, Annual Report of the Earth Simulator Center April 2008-September 2008, pp.105-112, EnglishDevelopment of advanced simulation methods for solid earth simulationsOthers
- Interactive Three-Dimensional Visualization Software by Virtual Reality TechnologyCAVEと呼ばれる方式のバーチャルリアリティ装置を利用した3次元可視化ソフトウェアを開発した.このソフト「VFIVE」はプラズマ・核融合シミュレーション用の可視化ソフトウェアとして出発し,10年近くにわたる開発の結果,複雑な3次元構造を持つ一般的なスカラー・ベクトル場を解析するための汎用ツールとして実用上十分なレベルに達した.CAVE装置の持つ優れた対話性と没入感を可視化に応用するために開発したVFIVE独自の可視化機能を紹介する.また,最近主流になりつつあるPCクラスター型のCAVE装置へのVFIVEの移植についても報告する.プラズマ・核融合学会, 25 Nov. 2008, Journal of plasma and fusion research, 84(11) (11), 834 - 843, Japanese
- 15 Sep. 2008, 可視化情報学会誌. Suppl. = Journal of the Visualization Society of Japan, 28(2) (2), 43 - 44, JapaneseInteractive Visualization Software for CAVE VR systems : VFIVE : For PC Clusters
- 可視化情報学会, 01 Jul. 2008, Journal of the Visualization Society of Japan, 28(110) (110), 180 - 185, JapaneseScientific Visualization for Solid Earth Simulations
- The Physical Society of Japan (JPS), 29 Feb. 2008, Meeting abstracts of the Physical Society of Japan, 63(1) (1), 227 - 227, Japanese24aQE-4 Holistic Simulation for Quiet Auroral Arcs Formation 2
- The physics of quiet auroral arcs formation has been studied with Macro-Micro Interlocked (MMI) simulations. In the macro part of our simulation code, the macroscopic instability between the magnetosphere and ionosphere is described by the magneto-hydro-dynamics (MHD) model. On the other hand, in the micro part, the microscopic instability is calculated by the particle-in-cell (PIC) model. In the MHD simulation, it is shown that longitudinally striated structures of the field-aligned current are formed by an ionospheric feedback instability[1]. Further, the emission of aurora arc is obtained from the energy spectrum of accelerated electrons with the PIC simulation. [1] T. Sato, J. Geophys. Res., 83, 1042, 1978.National Committee for IUTAM, 2008, NCTAM papers, National Congress of Theoretical and Applied Mechanics, Japan, 57, 214, Japanese, Domestic magazineSummary national conference
- Mar. 2007, Meeting Abstracts of the Physical Society of Japan, Issue 2, 62(1) (1), 189 - 189, JapaneseSummary national conference
- 01 Jul. 2006, 可視化情報学会誌. Suppl., 26(1) (1), 47 - 48, JapaneseCurrent status of visualization advancing together with simulation researches on the Earth Simulator
- 日本電気, Jul. 2005, NEC技報, 58(4) (4), 58 - 65, Japanese成果論文 地球シミュレータの応用成果 (スーパーコンピュータSX-8特集)
- The Physical Society of Japan (JPS), 04 Mar. 2005, Meeting abstracts of the Physical Society of Japan, 60(1) (1), 204 - 204, Japanese24pXG-3 Experimental Study of Magnetorotational Instability Using Liquid Metal
- 17 Sep. 2003, 日本バーチャルリアリティ学会大会論文集 = Proceedings of the Virtual Reality Society of Japan annual conference, 8, 549 - 550, JapaneseDevelopment of Application for Medical Education using Immersive Projection Display
- Numerical Simulation on Laboratory Experiment of Magnetorotational Instability : Circulation in a Taylor-Couette FlowAiming the first laboratory demonstration of magnetorotational instability (MRI), a liquid metal MHD experiment is undertaken at Princeton Plasma Physics Laboratory (PPPL). In order to produce a flow stable to hydronamic modes but unstable to MRI, a prototype water experiment in the same geometry has been performed. The initially proposed experimental setup consists of two concentric sbort cylinders rotating at constant angular velocities. However, preliminary data indicate that the toroidal flow profile in this cylindrical, or rather a disk-like, vessel is strongly affected by the vessel's horizontal boundaries (the lid and the bottom). Since the profile control of the toroidal flow is essential for the MRI experiment, we performed 2-D numerical simulations of this Navier-Stokes system to understand the flow structure and the boundary effect in detail. The simulation model, results, and comparison with experimental data will be presented in this talk. A poloidal circulation flow is driven at the boundaries by an Ekman-like effect. We found, in our numerical simulations, that a jet structure is formed as a part of the poloidal circulation. This poloidal circulation significantly modifies the toroidal flow from its preferred profile for the MRI experiment. A remedy to remove or minimize the effects of the poloidal circulation will be also presented.日本流体力学会, 2002, 日本流体力学会年会講演論文集, 2002, 126 - 127, Japanese
- 25 Dec. 2001, 日本バーチャルリアリティ学会誌 = Journal of the Virtual Reality Society of Japan, 6(3) (3), 191 - 194, Japanese没入型VR装置と大規模シミュレーション
- 19 Sep. 2001, 日本バーチャルリアリティ学会大会論文集 = Proceedings of the Virtual Reality Society of Japan annual conference, 6, 375 - 376, JapaneseDevelopment of Verbal Interface to Control Numerical Simulation Data by Voice Input
- The Physical Society of Japan (JPS), 09 Mar. 2001, Meeting abstracts of the Physical Society of Japan, 56(1) (1), 198 - 198, JapaneseComputer Simulation of Magnetorotationol Instablitiy
- The Japan Society of Mechanical Engineers, 27 Nov. 2000, The Computational Mechanics Conference, 2000(13) (13), 601 - 602, JapaneseRepresentation Method of Numerical Simulation Data in Immersive Display
- 18 Sep. 2000, 日本バーチャルリアリティ学会大会論文集 = Proceedings of the Virtual Reality Society of Japan annual conference, 5, 341 - 342, JapaneseVisualize and Auralize Numerical Simulation Data on Immersive Projection Display
- The Institute of Electronics, Information and Communication Engineers, 07 Sep. 2000, Proceedings of the Society Conference of IEICE, 2000, 239 - 239, JapaneseAural-Visual Virtual Representation System for Numerical Simulation Data
- The Physical Society of Japan (JPS), 10 Mar. 2000, Meeting abstracts of the Physical Society of Japan, 55(1) (1), 222 - 222, JapaneseScientific Visualization System of 3D Vector Fields by Virtual Reality Technology
- Scientific Visualization by Virtual Reality TechnologyWe have developed a virtual reality (VR) visualization program named VFIVE. The purpose of VFIVE is to visualize 3-dimensional (3-D) vector and scalar fields in 3-D (stereo view) in a virtual reality environment of CAVE, which is a room-sized projector-based VR system. VFIVE enables researchers to analyze their numerical data in 3D, interactively, and in real time.日本流体力学会, 2000, 日本流体力学会年会講演論文集, 2000, 375 - 376, Japanese
- 日本バ-チャルリアリティ学会, 29 Sep. 1999, 日本バ-チャルリアリティ学会大会論文集, 4, 383 - 386, Japanese仮想現実空間における立体音響システムの開発と数値シミュレーションモデルへの適用 (日本バーチャルリアリテイ学会第4回大会) -- (聴覚ディスプレイ)
- 海洋出版, May 1998, 月刊地球, 20(5) (5), 293 - 298, JapaneseMHDダイナモ (総特集 地球内部の数値シミュレ-ション)
- The Physical Society of Japan (JPS), 15 Mar. 1996, Abstracts of the meeting of the Physical Society of Japan. Annual meeting, 51(4) (4), 148 - 148, Japanese31a-YM-10 Spontaneous Generation of a Dipole Field by an MHD Dynamo and its Mechanism
- The Physical Society of Japan (JPS), 16 Mar. 1995, Abstracts of the meeting of the Physical Society of Japan. Annual meeting, 50(4) (4), 75 - 75, JapaneseConstruction of MHD Self-Organization Model
- The Physical Society of Japan (JPS), 16 Mar. 1995, Abstracts of the meeting of the Physical Society of Japan. Annual meeting, 50(4) (4), 90 - 90, JapaneseDipole Field Generation by an MHD Dynamo
- Sep. 1994Relaxation of the Continuously Twisted Magnetic Field
- The Physical Society of Japan (JPS), 16 Aug. 1994, Abstracts of the meeting of the Physical Society of Japan. Sectional meeting, 1994(4) (4), 64 - 64, Japanese2a-YB-6 Computer Simulation of an MHD Dynamo in aRotating Spherical Shell
- 一般社団法人日本物理学会, 16 Aug. 1994, 日本物理学会講演概要集. 秋の分科会, 1994(4) (4), 206 - 206, Japanese4p-W-6 プラズマ渦対流における磁力線トポロジー変換II
- The Physical Society of Japan (JPS), 16 Mar. 1994, Abstracts of the meeting of the Physical Society of Japan. Annual meeting, 49(4) (4), 88 - 88, Japanese28p-D-11 Computer Simulation of an MHD Dynamo in a Rotating Spherical Shell
- The Physical Society of Japan (JPS), 14 Sep. 1992, 秋の分科会講演予稿集, 1992(4) (4), 72 - 72, Japanese25a-G-11 Compressible Convection in a Rotating Spherical Shell
- The Physical Society of Japan (JPS), 12 Mar. 1992, 年会講演予稿集, 47(4) (4), 144 - 144, Japanese27a-Z-2 Compressive Convection of MHD Fluid in a Rotating Spherical Shell
- Single work, くもん出版, May 2020コンパスが南をさすとき: 地球のN極とS極が引っくり返るなぞに挑む
- Contributor, コアダイナミクスシミュレーション, 朝倉書店, Apr. 2018, Japanese, ISBN: 9784254160727図説地球科学の事典
- Contributor, Introduction to Virtual Reality Visualization by the CAVE System, TERRAPUB, 2007, English, ISBN: 9784887041387Advanced methods for space simulations
- Contributor, Yin-Yang Grid and Geodynamo Simulation, Elsevier, 2005, English, ISBN: 0080444768Computational fluid and solid mechanics 2005 : proceedings, third MIT Conference on Computational Fluid and Solid Mechanics, June 14-17, 2005
- Computational Infrastructure for Geodynamics (CIG) webinar (Online), May 2025Tetrahedral MHD dynamo model[Invited]Invited oral presentation
- 日本物理学会春季大会 シンポジウム「プラズマサイエンス」, Mar. 2025プラズマと計算科学[Invited]Nominated symposium
- 研究集会「シミュレーションと計算科学の学際展開:宇宙・地球・社会」, Mar. 2025シミュレーションと可視化[Invited]Invited oral presentation
- ROOT Program 週末セッション, Nov. 2024ライフゲームから始めるコンピュータシミュレーション[Invited]Public discourse
- 日本応用数理学会 応用数理ものづくり研究会 第58回技術セミナー, Oct. 2024地磁気のシミュレーション研究から派生した計算手法と可視化手法[Invited]Invited oral presentation
- 日本物理学会 第79回年次大会, Sep. 2024正四面体内部の熱対流によるMHDダイナモOral presentation
- 第37回数値流体力学シンポジウム, Dec. 2023正4面体内部のMHD熱対流Oral presentation
- プラズマ核融合学会 第40回年会, Nov. 2023正4面体MHDダイナモモデルOral presentation
- プラズマシミュレータシンポジウム, Sep. 2023正四面体ダイナモコードと断面可視化ライブラリの開発Poster presentation
- 第51回可視化情報シンポジウム, Aug. 2023SVGを用いた2次元可視化ライブラリの開発Oral presentation
- プラズマサイエンスシンポジウム, Sep. 2022MHDダイナモの正四面体モデル:シミュレーションコード開発の現状Poster presentation
- 日本物理学会秋季大会(オンライン), Sep. 2021, Japanese無回転球殻熱対流系における カイラルな対流パターン
- プラズマシミュレータシンポジウム, Sep. 2021, Japanese無回転球殻対流系における鏡像非対称な定常対流解Poster presentation
- 日本物理学会 秋季大会(オンライン), Sep. 2020ねじれた角柱状水流の形成Oral presentation
- 第36回 プラズマ・核融合学会 年会, Nov. 20194次元ストリートビュー: 計算機シミュレーションの新しい可視化手法[Invited]Invited oral presentation
- CFDシンポジウム, Nov. 2019動画ベースの可視化手法 4 次元ストリートビューOral presentation
- AAPPS-DPP 2019, Nov. 20194-D Street View: Movie-based visualization method for HPC[Invited]Invited oral presentation
- STEシミュレーション研究会, Sep. 2019可視化手法の新手法 4次元ストリートビュー
- プラズマシミュレータシンポジウム 2018 (PSS2018), Sep. 2019全方位動画に基づく新しい可視化手法
- 第87回CG・可視化研究会(CAVE研究会), Jun. 2019VFIVE開発の経緯とその後の発展の紹介[Invited]Invited oral presentation
- International Conference for Computational Science (ICCS) 2019, Jun. 2019In-Situ Visualization with Membrane Layer for Movie-based VisualizationPoster presentation
- JpGU(日本地球惑星科学連合大会), May 2019球内部のMHDシミュレーション手法と可視化ツールOral presentation
- プラズマ・核融合学会, Dec. 20184次元ストリートビュー手法による対話的in-situ可視化Poster presentation
- 2nd Asia-Pacific Conference on Plasma Physics (AAPPS-DPP2018), Nov. 2018, EnglishMHD Relaxation and Dynamo in a Sphere[Invited]Invited oral presentation
- プラズマシミュレータシンポジウム 2018 (PSS2018), Sep. 2018球内部のMHD緩和シミュレーションとそのin-situ可視化Poster presentation
- 日本物理学会 第73回年会, Mar. 2018流れと磁場が共存する球内部の MHD緩和Oral presentation
- プラズマシミュレータシンポジウム, Sep. 2017, Japanese, 核融合研, Domestic conferenceMHDシミュレーションの4次元ストリートビューOral presentation
- 日本地球惑星科学連合2017年大会, 2017, Japanese, 幕張, Domestic conference薄い球殻内の熱対流とMHDダイナモOral presentation
- NIFS研究会 MHD シミュレーションのための先進的数値計算手法, 2017, Japanese, 核融合研, Domestic conference球内部のMHD緩和Oral presentation
- プラズマコンファレンス2017, 2017, English, 姫路, Domestic conferenceDevelopment of a new MHD simulation code with asynchronous parallel visualizationPoster presentation
- プラズマコンファレンス2017, 2017, English, 姫路, Domestic conferenceA simple preprocessor for Fortran 2003 simulation programsPoster presentation
- 日本流体力学会, Sep. 2016, Japanese, 名古屋工業大学, Domestic conference単位球内部のMHD対流とMHD緩和Oral presentation
- プラズマシミュレータシンポジウム, Sep. 2016, Japanese, 核融合科学研究所, Domestic conference単位球内部のMHDシミュレーションOral presentation
- 第44回可視化情報シンポジウム, Jul. 2016, Japanese, The Visualization Society of Japan, Domestic conferenceVisualization of Yin-Yang-Zhong Grid Dataset with Particle-based Rendering[Invited]Oral presentation
- 日本地球惑星科学連合大会, May 2016, Japanese, 幕張メッセ, Domestic conference薄い対流層のMHDダイナモOral presentation
- 10th West Lake International Symposium (WLIS) on Magnetic Fusion and 12th Asia Pacific Plasma Theory Conference (APPTC) [WLIS-APPTC 2016],, May 2016, English, Hangzhou, China, International conferenceMHD Dynamo in a SphereInvited oral presentation
- 自然科学研究機構平成27年度新分野創成センター イメージングサイエンス研究分野 プロジェクト報告会, Mar. 2016, Japanese, 自然科学研究機構事務局, Domestic conference多視点全方位同時イメージングによるHPCデータの可視化Oral presentation
- 日本天文学会2016年春季年会 企画セッション「プラズマ宇宙物理」, Mar. 2016, Japanese, 首都大学東京, Domestic conferenceイン=ヤン=ゾン格子による全球MHDシミュレーションOral presentation
- 大阪大学サイバーメディアセンター サイバーHPCシンポジウム, Mar. 2016, Japanese, 大阪大学, Domestic conferenceHPCと可視化[Invited]Invited oral presentation
- The Dynamo Effect in Astrophysical and Laboratory Plasmas, Dec. 2015, English, Princeton, USA, International conferenceDynamo simulations with Yin-Yang-Zhong grid and its visualizations[Invited]Invited oral presentation
- 可視化情報全国講演会, Oct. 2015, Japanese, 京都工芸繊維大学, Domestic conferenceParaView/Catalystを用いた Yin-Yangダイナモシミュレーションのin-situ可視化Oral presentation
- The 17th International Symposium on Applied Electromagnetics and Mechanics (ISEM), Sep. 2015, English, Kobe, Japan, International conferenceYin-Yang Grid and Its Applications[Invited]Invited oral presentation
- 5th East-Asia School and Workshop on Laboratory, Space, and Astrophysical plasmas, Aug. 2015, English, POSTECH, Korea,, International conferenceDynamo[Invited]Invited oral presentation
- 日本地球惑星科学連合2015年大会, May 2015, Japanese, 幕張, Domestic conference球に対応した新しい重合格子「イン・ヤン・ゾン」格子の開発Oral presentation
- STEシミュレーション研究会, Dec. 2014, Japanese, 東京, Domestic conference4次元ストリートビューによる大規模データの対話的可視化Oral presentation
- 先進的描画装置を用いた可視化表現法の研究会, Dec. 2014, Japanese, 土岐, Domestic conference4次元ストリートビューによるデータ可視化Oral presentation
- Plasma2014, Nov. 2014, Japanese, 新潟, Domestic conference太陽タコクラインの維持機構Oral presentation
- スパコンを知る集い in 大阪, Sep. 2014, Japanese, 大阪, Domestic conference気まぐれな地球と律儀な太陽[Invited]Invited oral presentation
- プラズマ科学のフロンティア2014, Aug. 2014, Japanese, 土岐, Domestic conferenceMHDダイナモ[Invited]Oral presentation
- 大質量星の回転と進化, Feb. 2014, Japanese, 札幌, Domestic conference球ジオメトリ用MHDシミュレーションコードの開発Oral presentation
- SICE International Symposium on System Integration, Dec. 2013, English, IEEE, 神戸市, International conferenceSimulations & Visualizations of Magnetic Fields in Nature[Invited]Keynote oral presentation
- 日本SKAサイエンス会議, Sep. 2013, Japanese, 日本SKAコンソーシアム「宇宙磁場」科学検討班, 奥州市, Domestic conference新しい太陽ダイナモシミュレーションのためのいくつかの試みOral presentation
- 日本天文学会2013年秋季大会, Sep. 2013, Japanese, The Astronomical Society of Japan, 仙台市, Domestic conference新しい太陽ダイナモコードの開発Oral presentation
- 日本天文学会 2013 秋季年会, Sep. 2013, Japanese, 東北大学, Domestic conference回転球殻 MHD ダイナモ:貫入性対流の影響Oral presentation
- 第34回KOBE工学サミット, May 2013, Japanese, 神戸大学工学振興懇話会, 神戸市, Domestic conference地磁気・計算・仮想現実[Invited]Public discourse
- 日本音響学会関西支部2013年度講演会, Apr. 2013, Japanese, The Acoustical Society of Japan, 神戸市, Domestic conference仮想現実技術を利用した科学データの可視化[Invited]Public discourse
- プロジェクトマネジメント学会関西支部産学連携シンポジウム, Apr. 2013, Japanese, The Society of Project Management, 神戸市, Domestic conference仮想現実技術による科学データの可視化[Invited]Keynote oral presentation
- 兵庫県機械技術研究会 平成25年特別講演会, Feb. 2013, Japanese, 神戸, Domestic conference地磁気・計算・仮想現実[Invited]Invited oral presentation
- 研究会「バーチャルリアリティ装置における可視化技法, Jan. 2013, Japanese, 核融合科学研究所, Domestic conferenceVR可視化とIVI-SV法Oral presentation
- 第2回神戸大学統合研究拠点サロン「防災・減災」,, Dec. 2012, Japanese, 神戸大学, 統合研究拠点, Domestic conference防災減災と3次元可視化技術Oral presentation
- 平成24年度九大応力研共同利用研究集会 非線形波動研究の最前線―構造と現象の多様性―, Nov. 2012, Japanese, 九大 春日キャンパス, Domestic conferenceバーチャルリアリティ技術を利用した科学データの可視化[Invited]Invited oral presentation
- 日本機械学会第25回計算力学講演会(CMD2012)フォーラム 大規模シミュレーションと可視化, Oct. 2012, Japanese, 神戸, Domestic conference日本最大の没入型バーチャルリアリティ装置による3次元データの対話的可視化』[Invited]Invited oral presentation
- Conference on Computational Physics (CCP2012), Oct. 2012, English, Kobe, Japan, International conferenceScientific Visualization by Immersive Virtual Reality[Invited]Invited oral presentation
- 東大地球惑星インフォーマルセミナー, Oct. 2012, Japanese, 本郷, Domestic conferenceMHDダイナモシミュレーションとその可視化Oral presentation
- 第40回可視化情報シンポジウム, Jul. 2012, Japanese, 工学院大学, Domestic conferenceトレーサー曲線による流れ場のバーチャルリアリティ可視化Oral presentation
- JHPCN 学際大規模情報基盤共同利用・共同研究拠点 第4回シンポジウム, Jul. 2012, Japanese, 秋葉原, Domestic conferenceMHDダイナモシミュレーションとその可視化Oral presentation
- 神戸大学自然科学系先端融合研究環創立5周年記念シンポジウム「計算と科学技術の融合と展開」, Jun. 2012, Japanese, 神戸大学瀧川記念学術交流会館, Domestic conference地磁気と計算機と仮想現実技術[Invited]Invited oral presentation
- 日本地球惑星科学連合2012年大会, May 2012, Japanese, 幕張, Domestic conferenceインヤン格子データの可視化ツールと流れ場に凍り付いた力線のバーチャルリアリティ可視化Oral presentation
- 京都大学計算科学ユニット2012年度第1回研究交流会, Apr. 2012, Japanese, 京都大学 学術情報メディアセンター, Domestic conference地磁気、陰陽、仮想現実』[Invited]Invited oral presentation
- 地球電磁気・地球惑星圏学会 (SGEPSS) 2011年公開イベント講演会, Nov. 2011, Japanese, 地球電磁気・地球惑星圏学会, 神戸, Domestic conferenceスーパーコンピュータで挑む地磁気の謎 ——バーチャルリアリティ技術を活用して——Invited oral presentation
- Plasma Conference 2011, Nov. 2011, Japanese, プラズマ・核融合学会, 日本物理学会, 天文学会, 金沢, Domestic conferenceMHDシミュレーションと可視化Invited oral presentation
- 日本機械学会 第24回計算力学講演会, Oct. 2011, Japanese, 日本機械学会, 岡山, Domestic conferenceスーパーコンピュータと バーチャルリアリティで探る 地磁気の起源Invited oral presentation
- 第21回インテリジェント・システム・シンポジウム, Sep. 2011, Japanese, 日本機械学会ロボティクス・メカトロニクス部門, 神戸, Domestic conferenceスーパーコンピュータによる計算機シミュレーションのバーチャルリアリティ可視化Invited oral presentation
- ICNSP (International Conference on Numerical Simulations of Plasmas) 2011, Sep. 2011, English, PPPL, Long Branch, NJ, USA, International conferenceApplication Framework for Immersive Virtual Reality VisualizationsOral presentation
- SS研HPCフォーラム2011, Aug. 2011, Japanese, SS研究会, 東京, Domestic conference地磁気シミュレーションとバーチャルリアリティ可視化Invited oral presentation
- プラズマ若手夏の学校, Aug. 2011, Japanese, プラズマ・核融合学会, 高野山, Domestic conferenceプラズマ数値計算Invited oral presentation
- 第39回可視化情報シンポジウム, Jul. 2011, Japanese, 可視化情報学会, 東京, Domestic conference没入型バーチャルリアリティ装置によるシミュレーションデータの可視化Oral presentation
- IUGG (The International Union of Geodesy and Geophysics) 2011,, Jul. 2011, English, IUGG, Melbourne, Australia, International conferenceVirtual Reality Visualization of Geophysical DataInvited oral presentation
- 学際大規模情報基盤共同利用・共同研究拠点 第3回シンポジウム, Jul. 2011, Japanese, JHPCN, 東京, Domestic conferenceMHDダイナモシミュレーションOral presentation
- DS'11 (International Symposium on Disaster Simulation & Structural Safety in the Next Generation), Jul. 2011, English, Univ. Hyogo, Kobe, International conferenceImmersive Visualization in π-CAVEOral presentation
- ISSS-10 (The 10th International School Symposium for Space Simulations), Jul. 2011, English, ISSS, International conferenceImmersive Visualization in CAVEInvited oral presentation
- 神戸大学統合研究拠点設置記念・システム情報学研究科1周年合同シンポジウム, Jun. 2011, Japanese, 神戸大学, 神戸, Domestic conference統合研究拠点の3次元可視化装置“π-CAVE”Invited oral presentation
- 日本地球惑星科学連合2011年度連合大会, May 2011, Japanese, JPGU, 幕張, Domestic conferenceバーチャルリアリティ可視化ツールの開発と統合Oral presentation
- 学際大規模情報基盤共同利用・共同研究拠点 第2回シンポジウム, Jan. 2011, Japanese, JHPCN, 神戸, Domestic conferenceMHDダイナモシミュレーションOral presentation
- American Geophysical Union
- American Physical Society
- 日本地球惑星科学連合
- 地球電磁気・惑星圏学会
- 日本シミュレーション学会
- 可視化情報学会
- 日本流体力学会
- 日本物理学会
- プラズマ・核融合学会
- 2018Preprocessor for eFortran, a dialect of the modern Fortran.
- 2015MultiverseA framework for CAVE-type Virtual Reality (VR) applications
- 2000VFIVEAn interactive visualization program for CAVE-type Virtual Reality (VR) system.
- 日本学術振興会, Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (B), Grant-in-Aid for Scientific Research (B), Kobe University, Apr. 2022 - Mar. 2027, Principal investigatorエージェントカメラ群による新しいin situ可視化
- 日本学術振興会, Grants-in-Aid for Scientific Research Grant-in-Aid for Challenging Research (Exploratory), Grant-in-Aid for Challenging Research (Exploratory), Kobe University, Jun. 2022 - Mar. 2025, Principal investigator地球MHDダイナモの正4面体モデル
- Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (B), Kobe University, 01 Apr. 2020 - 31 Mar. 2024Smart in-situ visualization for large-scale numerical calculations aiming at efficient knowledge acquisition本研究では、大規模数値シミュレーションによって計算される数値データに対して、時間・空間・変数に関する3つの指標を設定することによって可視化すべき 時空間領域を効率よく推定し、In-situ可視化における画像化時間の短縮だけでなく、数値データからの科学的知見を獲得するまでの時間を短縮することができる スマートIn-situ可視化を実現することである。 本年度は、昨年度までに開発していた適応的時間サンプリング手法と最適視点推定手法の実装上の最適化を進めると同時に、それらを構成する処理要素の抽象化を行い、スマートIn-situ可視化を実現するためのフレームワーク化に成功した。本フレームワークについては、スーパーコンピュータ富岳環境での動作を確認しており、今後本格的な評価実験を実施する予定である。 また、本年度は、最適視点推定法について、新たな手法の開発に着手した。昨年度開発した手法では、空間内に配置した多数のカメラ画像から、それらの画像の差に注目することで重点領域の推定を行なっていた。結果として、撮影画像の枚数を効果的に削減することに成功したものの、注目する物理量の時間変化を動画像として再生する際に困難が生じていた。今年度は、この問題に対して、一定の時間間隔で画像エントロピーを計算することで最適視点を推定し、その視点を接続する移動経路を計算する最適視点経路推定法を開発した。本手法を歯茎摩擦音発生シミュレーションに適用し、その有効性を検証した。 さらに、本年度は、新たな計算指標となる因果探索手法の開発に着手した。現在、因果探索手法の一つである移動エントロピー法を実装し、予備的実験として気象アンサンブルシミュレーション結果に適用し、その効果を部分的に確認しているが、改善すべきいくつかのポイントも明確化された。今後、提案するIn-situ可視化フレームワークへ組み込み、効率的に改善手法の開発を進める予定である。
- 日本学術振興会, 【科研費】, 基盤研究(B), 2017 - 2022, Principal investigator全球MHDシミュレーションと先進的可視化による磁場と流れの自由緩和状態の解明Competitive research funding
- Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (C), Japan Agency for Marine-Earth Science and Technology, 01 Apr. 2016 - 31 Mar. 2019Research on Construction of Collaborative Visualization Environment Based on Virtual Reality Technology and Its Efficiency ImprovementIn order to construct a collaborative visualization environment, which based on the virtual reality technology, between different VR devices, a C++ library that is able to built a HMD executable binary file without modification to the source code written using CAVELib that is a C ++ library to develop application software for CAVE devices was developed. I succeeded in commonizing the source code between CAVE and the currently major HMDs through this development, and were able to establish an infrastructure for the collaborative visualization environment.
- 立石科学技術振興財団 助成金(B), 2018 - 2019, Principal investigator視点移動可能な全方位動画手法 開発Competitive research funding
- SCAT助成金, 2016 - 2019, Principal investigator位置情報の付加された全方位動画データ群を対話的に解析する手法Competitive research funding
- I-O DATA財団 研究助成, 2018 - 2018, Principal investigator4次元動画データブラウザの開発Competitive research funding
- Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Young Scientists (B), Suntory Foundation for Life Sciences, 01 Apr. 2014 - 31 Mar. 2017Three dimensional mapping of Ciona neuropeptides based on the imaging mass spectrometryIn this study, we analyzed the distribution of neuropeptides in the Ciona brain using matrix-assisted laser desorption/ionization time-of-flight (MALDI-TOF) imaging mass spectrometry (MS) based on our previous peptidomics data. Major Ciona neuropeptides were detected on a single brain section, and the images of their distributions were acquired with a spatial resolution of 20 micro meters. We further developed a method for high-resolution imaging MS by a combination of fluorescent microscope and imaging MS in the brain sections of transgenic Ciona that expresses fluorescent protein in neurons. The high-resolution imaging MS for the first time showed the distribution of four peptides in a single brain section at single-cell resolution. Both the high-resolution imaging MS and immunohistochemistry using specific antiserum against the neuropeptide Ci-TK-I yielded similar results, suggesting that the high-resolution imaging MS has a potential to serve as a new platform for histology.
- 日本学術振興会, 【科研費】, 挑戦的萌芽研究, 2016 - 2017, Principal investigator4次元ストリートビューによるHPCデータの対話的可視化Competitive research funding
- Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (A), Japan Agency for Marine-Earth Science and Technology, 01 Apr. 2012 - 31 Mar. 2016New mechanism for geomagnetic polarity reversals induced by flow reversalsWe explored magnetoconvection and rotating convection by means of laboratory experiments and numerical simulations, to elucidate the mechanism that induces geomagnetic polarity reversals. We established a regime diagram of convection in a liquid metal under the influence of imposed horizontal magnetic field. The searched space is summarized by the relation between buoyancy and magnetic force, in which a regime exists that reversals of flow direction repeat intermittently. We found that the key mechanism for flow reversals is an occurrence of large-scale circulation in a horizontal plane. We also performed numerical simulations of dynamos in a rotating spherical shell, and clarified the relation between polarity reversals and transitions of convection flow.
- 自然科学研究機構/新分野創成センターイメージングサイエンス研究分野プロジェクト, 2015 - 2015, Principal investigator多視点全方位同時イメージングによるHPCデータの可視化Competitive research funding
- 日本学術振興会, 【科研費】, 基盤研究(B), 2011 - 2015, Principal investigator次世代スパコンと3次元可視化技術による現実的低粘性領域での地球ダイナモ機構解明Competitive research funding
- 高橋産業経済研究財団, 2012 - 2012, Principal investigator没入シミュレーションスタイルの実現を目指した仮想水中環境の開発Competitive research funding
- 大川情報通信基金助成金, 2011 - 2011, Principal investigator没入型 VR 装置用 3 次元データ可視化ソフトウェアの開発Competitive research funding
- 山田科学振興財団助成金, 2010 - 2011, Principal investigator磁力線追跡機能を組み込んだ地球ダイナモシミュレーションCompetitive research funding
- Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (A), Japan Agency for Marine-Earth Science and Technology, 2009 - 2011Determination of the energy dissipation in the GeodynamoLaboratory experiments on the turbulent thermal convection of a liquid metal under ambient magnetic fields with various intensities were carried out. Consulting with the observed variations of the geomagnetic field and the results of geodynamo simulations, we tried to infer the turbulent state and the energy dissipation in the Earth's core. In the experiments, we found spontaneous reversals of the flow patterns of thermal convections within a certain range of the intensity of the magnetic fields and the Rayleigh numbers, which might be important to understand the origin of the geomagnetic field reversals.
- 財団法人ひょうご科学技術協会 研究助成(一般学術研究助成), 2010 - 2010, Principal investigator流れに凍り付いたベクトル場をバーチャルリアリティで 可視化する手法の開発Competitive research funding
- Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (B), Kyushu University, 2007 - 2010Research on multi-scale physics of ITER plasmas by using integrated transport codeThe interface between plasma core transport code TASK/TOPICS and edge divertor code SONIC has been developed, which enables the self-consistent integrated transport simulation for whole plasma. Using this code, the heat flux into diverter plate has been evaluated in the self-consistent manner. The results were reported in 23rd IAEA Fusion Energy Conference 2010. In addition, the multi-scale, multi-physics simulation study on fusion plasma has been performed. It is found that non-local effect due to the nonlinear interaction plays a role on non-local transport and transient phenomena in fusion plasmas. Near future, these findings will be cooperated into the transport model for ITER plasma analysis.
- Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (B), Japan Agency for Marine-Earth Science and Technology, 2007 - 2009Multi-physics Plasma Dynamics with Macro-Micro Interlocked SimulationsThe macro-micro interlocked (MMI) simulation is a new framework of numerical simulation, which is capable to deal with the interaction of multi-scale and multi-physics phenomena. In this study, we have developed the basic algorithm of the MMI simulation, and applied it to solar and space plasmas including solar flare and coronal mass ejection, as well as to the formation of cloud, in order to advance the capability of numerical simulations. In addition, we have developed the study for space weather forecasting with the MMI simulation.
- 三菱財団自然科学研究助成金, 2007 - 2008, Principal investigator地球ダイナモシミュレーションの可視化解析Competitive research funding
- Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (C), Japan Agency for Marine-Earth Science and Technology, 2005 - 2008, Principal investigatorDevelopment of Yin-Yang grid and its applications地球科学では、球面上や球内部に分布した物理量を扱う場合が多い。 球領域で定義された数値データを計算機で効率的に扱うためには適切な球面計算格子が不可欠である。 本研究では、研究代表者が考案した新しい球面格子「インヤン格子」を発展させ、さまざまな分野で応用した。 4年間の研究を通じ、インヤン格子を使った地球ダイナモシミュレーションコード、マントル対流シミュレーションコード、データ可視化コードなどを開発した。Competitive research funding
- Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (C), 2001 - 2003Physical Mechanism of Generation and Reversals of Geomagnetic DynamoThe Earth's magnetic field has two intriguing features ; one is its dipole nature ; and the other is its reversal of the north-south polarity. The purpose of this study is to simulate these features of the geomagnetic field and to understand the physical mechanism behind it by means of large scale computer simulation. The simulation model is as follows : We consider a spherical shell region between two concentric spheres. The temperatures of the spherical boundaries are kept constant and uniform ; the inner sphere is hot and outer sphere is cold. An electrically conducting fluid is confined in this spherical shell region, corresponding to the liquid iron in the Earth's outer core. When the temperature difference is sufficiently large, convection motion of the electrically conducting fluid sets about. The fundamental equations are the magnetohydrodynamic (MHD) equations with time development equations of temperature field. As a result of our computer simulation, spontaneous generation of dipole magnetic field and its intermittent reversals are successfully reproduced. detail analysis of the simulation data indicates that the dynamo-generated magnetic field has two stable states ; one is high energy state and the other is low energy state. One of interesting findings in this simulation is hat the dipole reversals take place only in the high energy state. Another interesting finding is that quadrupole moment grows, exceeding the dipole moment before the reversal. The computational grid system used in our simulation, by which we could successfully reproduced the dipole field generation and reversals, were spherical latitude-longitude grid. When we applied this code to the Earth Simulator, we found that the latitude-longitude grid is not suitable to this vector-parallel architecture. We, therefore, devised a new kind of spherical grid system based on the overset (or Chimera) grid methodology, and named it Yin-Yang grid. The Yin-Yang grid is successfully applied to the spherical shell MHD dynamo simulation.
- 総合研究大学院大学 共同研究, 2000 - 2002, Principal investigator仮想現実技術の科学研究への応用Competitive research funding
- 日本学術振興会, 【科研費】奨励研究(A), 奨励研究(A), 核融合科学研究所, 2000 - 2001, Principal investigatorVR技術を利用したプラズマ可視化プログラムの開発CAVE方式(あるいは没入ディスプレイ方式)のVR(Virtual Reality)装置を利用して、科学研究データを立体的に表示・解析するための汎用プログラムVFIVEを開発した。VFIVEは3次元の場のデータを、そのデータの中に「入り込んで」解析することを目的としており、特に磁気流体力学(MHD)シミュレーションのデータ解析や、流体力学のシミュレーションデータ解析に威力を発揮する。VFIVEプログラムのユーザは、指定されたフォーマットでデータを用意すれば、コマンド一つを打ち込むだけで、すぐにそのデータを立体的・対話的に解析することが出来る。VFIVEはC++言語で書かれており、その内部で利用する基礎ライブラリはCAVEライブラリとOpenGLだけである。そのため核融合研のVR装置CompleXcopeだけでなく、その他のCAVE方式VRシステムに容易に移植可能である。現在のVFIVEが持つ主な機能は以下の通りである。(1)3次元ベクトル場の力線(磁力線や流線など)の対話的な追跡と表示。(2)3次元ベクトル場の立体矢印の表示。(3)手の位置からのテストパーティクルの放出。(4)3次元スカラー場の等値面の表示。(5)スカラー場の断面分布の表示。 本年度は、このVFIVEの第1版を完成させた。また、日本語マニュアルの整備も行った。この日本語マニュアルは研究代表者のWebサイトで公開している。これまでに、このVFIVEプログラムは、(a)乱流シミュレーションの解析、(b)太陽コロナ磁場の解析、(c)MHDダイナモシミュレーションデータの解析、等に実際に応用した。Competitive research funding
- 日本学術振興会, 【科研費】奨励研究(A), 奨励研究(A), 核融合科学研究所, 1997 - 1998, Principal investigatorMHDダイナモによる双極子磁場の逆転回転球殻中の磁気流体(MHD流体)の熱対流運動によるMHDダイナモを計算機シミュレーションにより研究した。MHDダイナモ過程により生成された双極子磁場が突然逆転する現象の再現とその機構の解明が本研究課題の目標であった。シミュレーションモデルは以下の通りである。半径の異なる二つの球面に挟まれた球殻状の容器を考え、その中にMHD流体が閉じ込められているものとする。内側の球面は高温、外側の球面は低温にそれぞれ一定の温度に保たれており、球の中心方向に向かう重力が存在する。球殻全体は一定の角速度で回転している。この様な回転球殻容器内部のMHD流体の熱対流運動の時間発展を解くと、あるパラメータのもとでは、MHDダイナモ作用により、双極子磁場が自発的に生成されることがこれまでの我々の研究で明らかになっていた。本年度はこのシミュレーションモデルの元でさらに広範なパラメータランを行い、生成された双極子磁場が突然逆転するパラメータを発見した。逆転時の磁場エネルギーの変化を調べたところ、双極子磁場が逆転する時に磁場のエネルギーレベルが突然変化することが判明した。さらに時間発展を進めると、磁場のエネルギーには高い状態と低い状態の二つがあり、その二つのレベルを予想出来ないタイミングで突然遷移することが分かった。興味深いことに双極子の逆転が起きていない時のエネルギーレベルの遷移では八重極成分の逆転が起きていることが観測された。磁場のエネルギーレベルが二つあるという事実と、その間を遷移する瞬間に双極子成分か、八重極成分が逆転するという現象を見つけたのが今年度、本研究により明らかにされた最も重要な点である。Competitive research funding
- Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for international Scientific Research, National Institute for Fusion Science, 1996 - 1998Comparative Study of Confinement Physics in Toroidal PlasmasBased on agreement on academic exchange between National Institute for Fusion Science (NIFS) and the Australian National University (ANU), which was concluded on May, 1995, this project has aimed at understanding physics mechanism of various plasma phenomena occurring in toroidal geometry like the helical system plasma. 1. Concerning plasma theory, magnetic island formation and self-healing in three dimensional finite pressure equilibria, linear stability and nonlinear time development of pressure driven instabilities, optimizationof magnetic field configuration for helical axis stellarator, plasma self-organization, and development of advanced visualization technology by using virtual reality system are studied successfully as collaborative researches. 2. As for plasma heat ingexperiment, a device for electron cyclotron resonance heating was developed as a collaborative research, and was applied for the H-1 helical device in ANU.In addition, possibility of plasma heating by using ion cyclotron resonance heating was analyzed and proved to be valid in the complex geometry of helical axis stellarator. 3. Comparative study of plasma confinement between CHS in NIFS and H-1 in ANU has been executed, and common properties concerning fluctuation-driven particle flux was revealed. The new knowledge suggests existence of improved confinement mechanism not only for stellarator, but also for tokamak plasnas. 4. Innovative methods for diagnosis of plasma density have been developed out of collaborative research, and were proved to be of practical level by applying the device in LHD plasma measurements.
- Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for international Scientific Research, National lnstitute for Fusion Science, 1996 - 1997International Collaboration for Promoting Complexity ScienceWe have investigated the details of complex phenomena in rich variety of non-equilibrium open systems in collaboration with scientists In Japan, U.S.A., Europe and Asia. The summary of our collaboration research is described in the following. (1) We found from the MHD simulation that a strong magnetic field with a global and ordered structure is spontaneously generated by the MHD dynamo process in a rotating spherica1 shell, and its polarity is suddenly reversed after a long duration. (2) We have studied the merging process of two col1iding spheromaks, and found that a field-reversed configuration with a high pressure is formed through this process. (3) We have studied the physical process of collisionless driven reconnection by means of particle simulation. It should be emphasized that magnetic reconnection evolves in two steps due to two kinetic effects and the ions anomalously heated by the action of an electrostatic field. (4) Particle simulation has revealed that a super ion-acoustic double layr with a large potential gap is generated after the generation and disappearance of a norma1 ion-acoustic double layr if there exists an entropy expulsion process in an open system. (5) We have developed a particle simulation code for dust grains with dynamically charging processes, and clarified the condition under which the coagulation of dust grains takes place. (6) We have investigated the structure formation process at a molecular level by carrying out a molecular dynamics simulation of polymer chains . It is emphasized that the structure formation of polymer chains proceeds in a few steps. (7) We have developed three-dimensiona1 interactive data visualizing system "CompleXcope", which is a new application of the virtual reality system, as a powerful tool to comprehend complex phenomena.
- 日本学術振興会, 【科研費】奨励研究(A), 奨励研究(A), 核融合科学研究所, 1995 - 1995, Principal investigator磁気流体ダイナモの物理機構の解明磁気流体ダイナモの物理機構の解明を目指し、計算機シミュレーションによる研究を行った。考察した物理系は次の通りである。半径の異なる二つの球面にはさまれた球殻状の容器を考え、その内部に磁気流体が閉じ込められているものとする。内側の球面は高温、外側の球面は低温にそれぞれ一定の温度に保たれているものとする。球の中心方向に重力が働き、球殻全体は一定の角速度で回転している。このような回転球殻中での磁気流体の熱対流運動を磁気流体方程式を差分化する方法で解いた。今年度の研究を通じて得られた結果は次の通りである。 1.対流運動は円柱状の対流胞(対流柱)の集まりとして組織化される。 2.対流柱には高気圧柱と低気圧柱の二つの種類がある。 3.電気抵抗が十分小さいときには、磁気流体ダイナモにより強い磁場が生成される。 4.磁場のエネルギーは対流の運動エネルギーの十倍以上にも達し得る。 5.あるパラメータ領域のもとで生成される磁場成分を分解すると、双極子磁場が最も強いモードになる。 6.その双極子磁場成分の生成機構は対流柱内での流体運動による磁力線の変形と引き延ばしで説明できる。 7.また、この双極子磁場生成機構は古典的なα機構の一つとしてで理解できる。 8.α機構で生成された磁場は球殻の外側球面近くでは、低気圧柱の内部に集中する。 9.この現象は低気圧柱内部の流れ成分により引き起こされることが判明した。 以上を簡単にまとめると、磁気流体ダイナモによる双極子磁場生成は円柱状の対流胞構造の自然な帰結であることが、この研究から明らかになった。Competitive research funding
- Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for international Scientific Research, National Institute for Fusion Science, 1994 - 1995Simulation study of self-organization in plasmaWe have investigated the detail of "Self-organization" phenomena in various spatial scale in collaboration with the people in U.S., Europe and Australia.The followings are some of the successful results we got in this research project.1) We have developed a new simulation code in order to reveal the dynamo mechanism in MHD plasma.We found that the convection motion of the rotating plasma makes a cell structure and forms a dipole magnetic field through the transformation of the kinetic energy to the magnetic energy.It should be emphasized that the magnetic reconnection plays an important role in the formation of the dipole magnetic field structure.2) We have studied the structure of the finite beta plasma in the helical system and found the following interesting and important self-organization process.Even if the helical plasma is initially unstable and the structure is destroyed due to the pressure driven instability, the ordered structure is formed again through the nonlinear interaction.It should be noticed that when the structure is formed, the entropy, i.e., thermal energy is generally produced.In this case, the thermal energy is the cause of the structure instability, and simultaneously it resulted in the ordered structure.3) We have developed a quite new particle simulation code for an open boundary system.We found the "Super" ion-Acoustic double layr whose amplitude is more than 20 times larger than the regular one.In this study, it can be pointed out that the entropy production rate becomes highest when the structure is made up, and the entropy expulsion mechanism plays an important role in the maintenance of the ordered structure.4) We alomost made up a general scenario of the self-organization process for MHD plasmas.One of the conclusion of this scenario is that the structure formation occurs intermittently and shows the recurrence depending on the way of energy input to the system. Besides above results, we have studied various self-organization processes such as the structure formation in a dusty plasma, or the crystallization of polymer in the liquid.Now, we continue this investigation aiming the construction of the general theory of "Self-organization".
- 【科研費】学振特別研究員奨励費, 1992 - 1993, Principal investigatorMHD流体における対流の発生と磁場生成の機構の解明Competitive research funding
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