Research activity information

• Jun. 2019 Asian Control Association, The 12th Asian Control Conference Best Paper Award, 「A New Distributed Constrained Multi-Agent Optimization Protocol with Convergence Proof via Exactness of Penalized Objective Function」

  MASUBUCHI IZUMI, Wada Takayuki, Fujisaki Yasumasa, Dabbene Fabrizio

  International society


• 2003 計測自動制御学会, 計測自動制御学会制御部門パイオニア賞, 「線形行列不等式 (LMI)を用いた制御系の解析・設計ならびにディスクリプタシステムに関する一連の研究成果」

  MASUBUCHI IZUMI

  計測自動制御学会制御部門より，推薦締め切り時点において 40歳以下で，新規性の高い研究業績をあげた研究者・技術者個人（毎年１名以内）に授与される．線形行列不等式 (LMI)を用いた制御系の解析・設計ならびにディスクリプタシステムに関する一連の研究成果がこれに該当すると評価された．

  Japan society


• 1999 システム制御情報学会, システム制御情報学会学会賞奨励賞, 「スプライン型リアプノフ関数を用いたパラメータ依存LMIの求解」，第42 回システム制御情報学会研究発表講演会講演論文集， pp. 231-232 (1998.5)

  MASUBUCHI IZUMI

  Japan society


• 1997 計測自動制御学会, 計測自動制御学会奨励賞, 「Implicit System の安定化について」，第20 回Dynamical System Theory シンポジウム, pp. 7-10 (1997.10)

  MASUBUCHI IZUMI

  Japan society


• 1995 計測自動制御学会, 計測自動制御学会論文賞武田賞, 「安定化状態フィードバックゲインのパラメトリゼーションに基づくロバスト制御系設計」，計測自動制御学会論文集，Vol. 30, No. 5, pp. 527-536 (1994.5)

  MASUBUCHI IZUMI

  Official journal

• A Multi-Objective Gain-Scheduled State-Feedback Synthesis for Infinite-Dimensional Linear Parameter Varying Systems Based on Linear Operator Inequalities

  Izumi Masubuchi

  IEEE, Mar. 2026, 2026 SICE International Symposium on Control Systems (SICE ISCS), 67 - 74, English

  [Refereed]

  International conference proceedings


• On change-of-variables approach for infinite-dimensional systems via non-coercive Lyapunov operator

  Izumi Masubuchi

  Mar. 2025, Proceedings of the SICE International Symposium on Control Systems 2025, English

  [Refereed]

  International conference proceedings


• An extended Lyapunov-density condition for nonlinear time-varying systems

  Izumi Masubuchi

  Jul. 2023, Proceedings of the 22nd IFAC World Congress, 4889 - 4894, English

  [Refereed]

  International conference proceedings

  Link to Kobe Univ. Repository (Kernel)


• On gain-scheduled control of nonlinear systems: synthesis via Lyapunov densities

  Izumi Masubuchi

  Sep. 2022, Proceedings of the SICE Annual Conference 2022, 345 - 346, English

  [Refereed]

  International conference proceedings


• Multi‐agent consensus with stopping rules under bounded measurement noise

  Kenta Hanada, Takayuki Wada, Izumi Masubuchi, Toru Asai, Yasumasa Fujisaki

  Abstract A multi‐agent consensus protocol is investigated over noisy undirected connected graphs. It is supposed that each agent can know her neighbors' states with bounded noise. A theoretical stopping rule having a probabilistic guarantee is established for the consensus protocol, which explicitly relates the number of iterations with the closeness of the agreement. The stopping rule is derived by utilizing Bernstein inequality that deals with a given noise bound explicitly. The sample complexity with respect to the number of agents is also investigated, where it is shown that the number of iterations required by the proposed stopping rule based on the bound of noise itself is generally smaller than that of the conventional stopping rules that utilize bound of noise variance. The results are demonstrated through numerical examples.

  Wiley, Aug. 2022, Asian Journal of Control, 25(2) (2), 651 - 661, English

  [Refereed]

  Scientific journal


• Cell Zooming With Masked Data for Off-Grid Small Cell Networks: Distributed Optimization Approach

  Masashi Wakaiki, Katsuya Suto, Izumi Masubuchi

  Institute of Electrical and Electronics Engineers (IEEE), Jul. 2022, IEEE Transactions on Control Systems Technology, 30(4) (4), 1696 - 1710, English

  [Refereed]

  Scientific journal


• A multi-objective state-feedback synthesis for infinite-dimensional systems based on linear operator inequalities in the conjugate space

  Izumi Masubuchi

  May 2022, Proceedings of the 12th Asian Control Conference, 1256 - 1261, English

  [Refereed]

  International conference proceedings


• On Robust Feedback Control of Nonlinear Systems with Time-Varying Uncertainties via Lyapunov Densities

  Izumi Masubuchi

  Sep. 2021, Proceedings of the SICE Annual Conference 2021, 1004 - 1006, English

  [Refereed]

  International conference proceedings


• State Feedback Synthesis for Infinite-Dimensional Systems via Linear Operator Inequalities in the Dual Space

  大薗隼人, 増淵泉

  Corresponding, May 2021, システム制御情報学会研究発表講演会講演論文集(CD-ROM), 65th


• Multi‐agent consensus for distributed power dispatch with load balancing

  Kenta Hanada, Takayuki Wada, Izumi Masubuchi, Toru Asai, Yasumasa Fujisaki

  Wiley, Mar. 2021, Asian Journal of Control, 23(2) (2), 611 - 619, English

  [Refereed]

  Scientific journal


• Lyapunov Density Criteria for Time-Varying and Periodically Time-Varying Nonlinear Systems with Converse Results

  Izumi Masubuchi, Takahiro Kikuchi

  Society for Industrial {\&} Applied Mathematics ({SIAM}), Jan. 2021, SIAM Journal on Control and Optimization, 59(1) (1), 223 - 241, English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Stochastic Consensus Algorithms over General Noisy Networks

  Kenta Hanada, Takayuki Wada, Izumi Masubuchi, Toru Asai, Yasumasa Fujisaki

  Informa {UK} Limited, Nov. 2020, SICE Journal of Control, Measurement, and System Integration, 13(6) (6), 274 - 281, English

  [Refereed]

  Scientific journal


• Synthesis of Memory Gain-Scheduled Controllers for Discrete-Time LPV Systems

  Izumi Masubuchi, Yuta Yabuki

  Informa {UK} Limited, Sep. 2020, SICE Journal of Control, Measurement, and System Integration, 13(5) (5), 249 - 255, English

  [Refereed]

  Scientific journal


• Operator inequality approach for state-feedback stabilization of infinite- dimensional systems: synthesis via dual of input-to-state operator

  Izumi Masubuchi

  Jul. 2020, Proceedings of the 21st IFAC World Congress, 7788 - 7791, English

  [Refereed]

  International conference proceedings


• Multi-Agent Based Load Balancing Dispatch for Power Systems with Renewable Energy

  Kenta Hanada, Takayuki Wada, Izumi Masubuchi, Toru Asai, Yasumasa Fujisaki

  The Institute of Systems, Control and Information Engineers, Jun. 2020, Proceedings of the ISCIE International Symposium on Stochastic Systems Theory and its Applications, 2020, 13 - 16, English

  [Refereed]

  Scientific journal


• A stopping rule for multi-agent consensus with bounded noise in measurements

  Kenta Hanada, Takayuki Wada, Izumi Masubuchi, Toru Asai, Yasumasa Fujisaki

  Mar. 2020, 2020 SICE International Symposium on Control Systems (SICE ISCS), 20 - 25, English

  [Refereed]

  International conference proceedings


• Distributed multi-agent optimization protocol over energy management networks

  Izumi Masubuchi, Takayuki Wada, Yasumasa Fujisaki, Fabrizio Dabbene

  Springer Singapore, Jan. 2020, Economically Enabled Energy Management: Interplay Between Control Engineering and Economics, 279 - 308, English

  In book


• Scaled Group Consensus over Weakly Connected Structurally Balanced Graphs

  Kenta Hanada, Takayuki Wada, Izumi Masubuchi, Toru Asai, Yasumasa Fujisaki

  2020, 21st IFAC World Congress / IFAC-PapersOnLine, 53(2) (2), 3037 - 3042, English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• On a New Class of Structurally Balanced Graphs for Scaled Group Consensus

  Kenta Hanada, Takayuki Wada, Izumi Masubuchi, Toru Asai, Yasumasa Fujisaki

  Sep. 2019, Proceedings of SICE Annual Conference 2019, 1671 - 1676, English

  [Refereed]

  International conference proceedings


• Exact-Penalty Based Distributed Multi-Agent Optimization Protocol with Partial Consensus

  Izumi Masubuchi, Takayuki Wada, Yasumasa Fujisaki, Fabrizio Dabbene

  Sep. 2019, SICE Annual Conference 2019, 1667 - 1670, English, Co-authored internationally

  [Refereed]

  International conference proceedings


• Privacy-preserved Cell Zooming with Distributed Optimization in Green Networks

  Masashi Wakaiki, Katsuya Suto, Izumi Masubuchi

  Sep. 2019, IEEE 90th VTC2019-Fall, 1 - 5, English

  [Refereed]

  International conference proceedings


• A Time Averaging Algorithm for Load Balancing in Distributed Power Dispatch

  Kenta hanada, Takayuki Wada, Izumi Masubuchi, Toru Asai, Yasumasa Fujisaki

  Aug. 2019, Proceedings of 2019 IEEE Control Technology and Applications, 643 - 648, English

  [Refereed]

  International conference proceedings


• A Stopping Rule for Multi-Agent Consensus over Unbalanced Noisy Networks

  Kenta Hanada, Takayuki Wada, Izumi Masubuchi, Toru Asai, Yasumasa Fujisaki

  The Institute of Systems, Control and Information Engineers, Jul. 2019, Proceedings of the ISCIE International Symposium on Stochastic Systems Theory and its Applications, 2019(0) (0), 117 - 120, English

  [Refereed]

  Scientific journal


• 離散時間線形時不変システム解析のための外部非負システムの構成と低次元化

  蛯原 義雄, 瀬部 昇, 増淵 泉, 脇 隼人, 管野 政明, 椿野 大輔

  システム制御情報学会, Jul. 2019, システム制御情報学会論文誌 = Transactions of the Institute of Systems, Control and Information Engineers, 32(7) (7), 284 - 293, Japanese

  [Refereed]

  Scientific journal


• A New Distributed Constrained Multi-Agent Optimization Protocol with Convergence Proof via Exactness of Penalized Objective Function

  Izumi Masubuchi, Takayuki Wada, Yasumasa Fujisaki, Fabrizio Dabbene

  Jun. 2019, Proceedings of the 12nd Asian Control Conference, 19 - 24, English, Co-authored internationally

  [Refereed]

  International conference proceedings


• Stochastic consensus over multi-channel networks of MIMO linear symmetric agents

  Hanada Kenta, Wada Takayuki, Masubuchi Izumi, Asai Toru, Fujisaki Yasumasa

  Mar. 2019, Transactions of the Institute of Systems, Control and Information Engineers, 32(2) (2), 55 - 62, English

  [Refereed]

  Scientific journal


• Bounded confidence gossip algorithms for opinion formation and data clustering

  Nguyen Linh, Wada Takayuki, Masubuchi Izumi, Asai Toru, Fujisaki Yasumasa

  Mar. 2019, IEEE Transactions on Automatic Control, 64(3) (3), 1150 - 1155, English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Improvement of distributed multi-agent optimization protocol based on exact penalty method

  Masubuchi Izumi, Wada Takayuki, Fujisaki Yasumasa, Fabrizio Dabbene

  Sep. 2018, Proceedings of the SICE Annual Conference 2018, 262 - 265, English

  [Refereed]

  International conference proceedings


• Distributed multi-agent optimization for Pareto optimal problem over unbalanced networks via exact penalty methods with equality and inequality constraints

  Masubuchi Izumi, Wada Takayuki, Fujisaki Yasumasa, Fabrizio Dabbene

  Jul. 2018, Proceedings of the 23rd International Symposium on Mathematical Theory of Networks and Systems, 447 - 452, English

  [Refereed]

  International conference proceedings


• An averaging consensus algorithm and its stopping rule over noisy networks of MIMO linear symmetric agents

  Hanada Kenta, Wada Takayuki, Masubuchi Izumi, Asai Toru, Fujisaki Yasumasa

  The Institute of Systems, Control and Information Engineers, Jun. 2018, Proceedings of the 49th ISCIE International Symposium on Stochastic Systems Theory and its Applications, 2018, 46 - 49, English

  [Refereed]

  International conference proceedings


• Convergence Analysis of Weighted Averaging Consensus for Distributed Power Dispatch with Load Balancing

  Kenta Hanada, Takayuki Wada, Izumi Masubuchi, Toru Asai, Yasumasa Fujisaki

  Mar. 2018, SICE International Symposium on Control Systems 2018 (Part of the 5th Multi-symposium on Control System (MSCS 2018)), English

  [Refereed]

  International conference proceedings


• 外部非負システムへの変換による離散時間線形時不変システムのH2解析

  Ebihara Yoshio, Sebe Noboru, Masubuchi Izumi, Waki Hayato, Kanno Masaaki, Tsubakino Daisuke

  システム制御情報学会, Feb. 2018, システム制御情報学会論文誌, 31(2) (2), 75 - 84, Japanese

  [Refereed]

  Scientific journal


• Consensus-based rendezvous control of double integrators via binary relative positions and velocity feedback

  Masubuchi, I., Sakaguchi, S.

  2018, IMA Journal of Mathematical Control and Information, 35(4) (4), English

  [Refereed]

  Scientific journal

  Link to Kobe Univ. Repository (Kernel)


• Stochastic consensus over time-varying networks of linear symmetric agents

  Hanada Kenta, Wada Takayuki, Masubuchi Izumi, Asai Toru, Fujisaki Yasumasa

  Transactions of the Institute of Systems, Control and Information Engineers, Jan. 2018, Transactions of the Institute of Systems, Control and Information Engineers, 31(1) (1), 28 - 35, English

  [Refereed]

  Scientific journal


• A Consensus Protocol over Noisy Two-Layered Networks with Cooperative and Antagonistic Interactions

  L. T.H. Nguyen, T. Wada, I. Masubuchi, T. Asai, Y. Fujisaki

  Wiley-Blackwell, Jan. 2018, Asian Journal of Control, 20(1) (1), 548 - 557, English

  [Refereed]

  Scientific journal


• On transient responses of an ADMM-based distributed multi-agent optimization protocol

  Izumi Masubuchi, Toru Asai, Takayuki Wada, Kenta Hanada, Yasumasa Fujisaki

  Institute of Electrical and Electronics Engineers Inc., Jul. 2017, 2017 25th Mediterranean Conference on Control and Automation, MED 2017, 660 - 665, English

  [Refereed]

  International conference proceedings


• Lyapunov density for almost attraction of nonlinear time-varying systems: A condition without assuming local stability

  Izumi Masubuchi, Takahiro Kikuchi

  Institute of Electrical and Electronics Engineers Inc., Jul. 2017, 2017 25th Mediterranean Conference on Control and Automation, MED 2017, 169 - 173, English

  [Refereed]

  International conference proceedings


• Distributed Multi-Objective Optimization over Randomly Varying Unbalanced Networks

  Takayuki Wada, Izumi Masubuchi, Kenta Hanada, Toru Asai, Yasumasa Fujisaki

  Elsevier B.V., Jul. 2017, IFAC-PapersOnLine, 50(1) (1), 2403 - 2408, English

  [Refereed]

  Scientific journal


• Distributed multi-objective optimization over randomly varying unbalanced networks

  Wada Takayuki, Masubuchi Izumi, Hanada Kenta, Asai Toru, Fujisaki Yasumasa

  Jul. 2017, Proceedings of the 18th IFAC World Congress, 2455 - 2460, English

  [Refereed]

  International conference proceedings


• A randomized algorithm for chance constrained optimal power flow with renewables

  Wada Takayuki, Morita Ryosuke, Asai Toru, Masubuchi Izumi, Fujisaki Yasumasa

  A chance constrained AC optimal power flow is to find the optimal economic operation plan whose probability satisfying AC power flow equations and various inequality constraints on operating limits of the power system is greater than a specified probability level. Even if a constraint condition for each uncertain power supply value is convex with respect to decision variables, the chance constrained problem is not convex in general. Thus, it is difficult to solve the problem within reasonable computational time. Employment of randomization techniques for this issue is proposed in this paper. A main advantage of the framework leads to a solution with a theoretical guarantee. Its sample complexities are of polynomial order for parameters of a given accuracy. The efficiency of this algorithm is demonstrated by applying it to the Japanese power system models.

  The Society of Instrument and Control Engineers, Jul. 2017, SICE Journal of Control, Measurement, and System Integration, 10(4) (4), 303 - 309, English

  [Refereed]

  Scientific journal


• Opinion formation over signed gossip networks

  Linh Thi, Hoai Nguyen, Wada Takayuki, Masubuchi Izumi, Asai Toru, Fujisaki Yasumasa

  The Society of Instrument and Control Engineers, May 2017, SICE Journal of Control, Measurement, and System Integration, 10(3) (3), 266 - 273, English

  [Refereed]

  Scientific journal


• Convergence analysis of stochastic consensus over noisy networks of linear symmetric agents

  Hanada Kenta, Wada Takayuki, Masubuchi Izumi, Asai Toru, Fujisaki Yasumasa

  A multi-agent system over noisy undirected networks with linear symmetric agents is considered. A stochastic consensus algorithm is established and analyzed under the noisy environment. An explicit relation between the number of iterations and the closeness of the agreement is also established. The results are illustrated through a numerical example.

  The ISCIE Symposium on Stochastic Systems Theory and Its Applications, May 2017, Proceedings of the 48th ISCIE International Symposium on Stochastic Systems Theory and its Applications, 2017, 186 - 189, English

  [Refereed]

  International conference proceedings


• Time Averaging Consensus over Noisy Networks of Linear Symmetric Agents

  Kenta Hanada, Takayuki Wada, Izumi Masubuchi, Toru Asai, Yasumasa Fujisaki

  Mar. 2017, SICE International Symposium on Control Systems 2017 (Part of the 4th Multi-symposium on Control Systems: MSCS 2017), English

  [Refereed]

  International conference proceedings


• Exponential Convergence Analysis of Nonlinear Systems via Lyapunov Densities

  Tsukasa Sakaguchi, Izumi Masubuchi

  2017, 2017 56TH ANNUAL CONFERENCE OF THE SOCIETY OF INSTRUMENT AND CONTROL ENGINEERS OF JAPAN (SICE), 369 - 372, English

  [Refereed]

  International conference proceedings


• Multiagent consensus with noisy communication: Stopping rules based on network graphs

  Ryosuke Morita, Takayuki Wada, Izumi Masubuchi, Toru Asai, Yasumasa Fujisaki

  Institute of Electrical and Electronics Engineers Inc., Dec. 2016, IEEE Transactions on Control of Network Systems, 3(4) (4), 358 - 365, English

  [Refereed]

  Scientific journal


• TIME AVERAGING ALGORITHMS WITH STOPPING RULES FOR MULTI-AGENT CONSENSUS WITH NOISY MEASUREMENTS

  R. Morita, T. Wada, I. Masubuchi, T. Asai, Y. Fujisaki

  Nov. 2016, ASIAN JOURNAL OF CONTROL, 18(6) (6), 1969 - 1982, English

  [Refereed]

  Scientific journal


• Distributed multi-agent optimization based on an exact penalty method with equality and inequality constraints

  Masubuchi Izumi, Wada Takayuki, Asai Toru, Linh Nguyen Thi Hoai, Ohta Yuzo, Fujisaki Yasumasa

  This paper proposes a distributed multi-agent optimization protocol to minimize the average of objective functions of the agents in the network with satisfying equality and inequality constraints of each agent. The exact penalty method is adopted to obtain a linear distributed optimization protocol. The proposed protocol works only with the decision variables and does not need any additional variables. The proof of the consensus and convergence of the proposed protocol is provided as well as the boundedness under mild assumptions. The protocol is also illustrated by a numerical example.

  The Society of Instrument and Control Engineers, Oct. 2016, SICE Journal of Control, Measurement, and System Integration, 9(4) (4), 186 - 186, English

  [Refereed]

  Scientific journal


• GAIN-SCHEDULED CONTROL VIA SWITCHING OF LTI CONTROLLERS AND STATE RESET

  Izumi Masubuchi, Shota Ishii, Yuzo Ohta, Masami Saeki

  Sep. 2016, ASIAN JOURNAL OF CONTROL, 18(5) (5), 1619 - 1629, English

  [Refereed]

  Scientific journal


• Improved results on discrete-time gain-scheduled controller synthesis via parameter-dependent LMIs

  Izumi Masubuchi, Yuta Yabuki

  Mar. 2016, 2016 SICE International Symposium on Control Systems (Part of the 3rd Multi-symposium on Control Systems), Paper No. 35, English

  [Refereed]

  International conference proceedings


• A bounded confidence gossip algorithm over communication graph for clustering opinions

  Linh Thi, Hoai Nguyen, Takayuki Wada, Izumi Masubuchi, Toru Asai, Yasumasa. Fujisaki

  Mar. 2016, Proceedings of the 2016 SICE International Symposium on Control Systems (Part of the 3rd Multi-symposium on Control Systems), Paper No. 39, English

  [Refereed]

  International conference proceedings


• Analysis of Almost-Everywhere Stability of a Class of Discontinuous Systems via Lyapunov Densities

  Izumi Masubuchi, Yuzo Ohta

  2016, 2016 EUROPEAN CONTROL CONFERENCE (ECC), 2016(ECC) (ECC), 567 - 574, English

  [Refereed]

  International conference proceedings


• Probabilistic consensus over directed two-layered networks with communication noise

  Linh Thi, Hoai Nguyen, Takayuki Wada, Izumi Masubuchi, Toru Asai, Yasumasa Fujisaki

  This paper deals with a consensus problem for directed two-layered networks in which dynamics of agents are driven by topologies on both cooperative and competitive graphs. A distributed algorithm for exchanging information between agents in the networks is introduced, where the communication noises are taken into account. A sufficient condition for the proposed algorithm to achieve the socalled ε-averaging consensus, i.e., system state gets arbitrarily close to the average value of agents' states with desired high probability, is shown. A rigorous stopping rule for the algorithm is also derived. It is shown that all the agents' states converge to the average value of the initial states when the modeling parameters are chosen appropriately.

  Institute of Systems, Control and Information Engineers, Dec. 2015, Transactions of the Institute of Systems, Control and Information Engineers, 28(12) (12), 476 - 483, English

  [Refereed]

  Scientific journal


• Finite a% settling time control of discrete time nonlinear constrained systems

  Yuzo Ohta, Yoshiki Shibutani, Izumi Masubuchi

  Dec. 2015, Proceedings of the 2015 International Symposium on Nonlinear Theory and its Applications, 281 - 284, English

  [Refereed]

  International conference proceedings


• A constrained tracking control algorithm for linear systems based on a spline-type parameter-dependent Lyapunov function

  N. Wada, M. Saeki, I. Masubuchi

  Aug. 2015, International Journal of Robust and Nonlinear Control, 25(12) (12), 1877 - 1896, English

  [Refereed]

  Scientific journal


• Multi-Agent Consensus on Noisy Networks with Antagonistic Interactions

  Linh Thi Hoai Nguyen, Takayuki Wada, Izumi Masubuchi, Toru Asai, Yasumasa Fujisaki

  This paper deals with a consensus problem for multiagent networks with noise-corrupted measurements. The networks are assumed to have antagonistic interactions that represent a kind of competition between agents. The objective of this paper is to find a condition under which global consensus on the states of the agents is achieved. In particular, a rigorous stopping rule is derived for the consensus algorithm. It gives a certain number of updates so that all of the states get close to the average value of them within a specified tolerance and with a specified probability.

  The ISCIE Symposium on Stochastic Systems Theory and Its Applications, May 2015, Proceedings of the 46th International Symposium on Stochastic Systems Theory and Its Applications, 2015, 85 - 90, English

  [Refereed]

  International conference proceedings


• Distributed multi-agent optimization based on a constrained subgradient method

  Izumi Masubuchi, Takayuki Wada, Ryosuke Morita, Toru Asai, Yuzo Ohta, Yasumasa Fujisaki

  This paper proposes a protocol for a distributed optimization problem to minimize the average of objective
  functions of the agents in the network with satisfying constraints of each agent. The protocol can handle uncommon
  constraints of the agents. Instead of invoking dual functions, only 1-bit information on fulfillment of the constraint of
  each agent is transmitted between ag

  The Society of Instrument and Control Engineers, May 2015, SICE Journal of Control, Measurement, and System Integration, 8(3) (3), 234 - 240, English

  [Refereed]

  Scientific journal


• Convergence analysis of a gossip algorithm over signed graphs

  Nguyen Thi, Hoai Linh, Takayuki Wada, Izumi Masubuchi, Toru Asai, Yasumasa. Fujisaki

  Mar. 2015, Proceedings of the SICE International Symposium on Control Systems 2015 (Part of the 2nd Multi-symposium on Control Systems), Paper No. 613 - 1, English

  [Refereed]

  International conference proceedings


• A Lyapunov-density result for stability analysis of a class of discontinuous nonlinear systems

  Izumi Masubuchi, Yuzo Ohta

  Mar. 2015, SICE International Symposium on Control Systems 2015 (Part of the 2nd Multi-symposium on Control Systems), Paper No. 712 - 2, English

  [Refereed]

  International conference proceedings


• Distributed Optimization with Equality and Inequality Constraints with Delayed Information of Feasibility

  Izumi Masubuchi, Takayuki Wada, Nguyen Thi Hoai Linh, Tort Asai, Yuzo Ohta, Yasumasa Fujisaki

  2015, 2015 10TH ASIAN CONTROL CONFERENCE (ASCC), 1199 - 1204, English

  [Refereed]

  International conference proceedings


• Convergence Time Evaluation of a Gossip Algorithm over Signed Graphs

  Nguyen Thi Hoai Linh, Takayuki Wada, Izumi Masubuchi, Tom Asai, Yasumasa Fujisaki

  2015, 2015 10TH ASIAN CONTROL CONFERENCE (ASCC), 905 - 909, English

  [Refereed]

  International conference proceedings


• Gain-Scheduled Control of Attitude of a Satellite: Synthesis via G-Scaling

  Yoshinobu Suzuki, Izumi Masubuchi, Yuzo Ohta

  2015, 2015 54TH ANNUAL CONFERENCE OF THE SOCIETY OF INSTRUMENT AND CONTROL ENGINEERS OF JAPAN (SICE), 806 - 809, English

  [Refereed]

  International conference proceedings


• Distributed Constrained Optimization Protocol via an Exact Penalty Method

  Izumi Masubuchi, Takayuki Wada, Toru Asai, Nguyen Thi Hoai Linh, Yuzo Ohta, Yasumasa Fujisaki

  2015, 2015 EUROPEAN CONTROL CONFERENCE (ECC), 1486 - 1491, English

  [Refereed]

  International conference proceedings


• Gossip Algorithms for Clustering Problems

  Linh Thi Hoai Nguyen, Takayuki Wada, Izumi Masubuchi, Toru Asai, Yasumasa Fujisaki

  2015, IECON 2015 - 41ST ANNUAL CONFERENCE OF THE IEEE INDUSTRIAL ELECTRONICS SOCIETY, 589 - 594, English

  [Refereed]

  International conference proceedings


• Control of a Servo Press Using Distributed Reference Governors

  Yuzo Ohta, Yoshiki Shibutani, Izumi Masubuchi

  2015, IECON 2015 - 41ST ANNUAL CONFERENCE OF THE IEEE INDUSTRIAL ELECTRONICS SOCIETY, 3153 - 3158, English

  [Refereed]

  International conference proceedings


• Opinion Formation under Bounded Confidence via Gossip Algorithms

  Nguyen Thi Hoai Linh, Takayuki Wada, Izumi Masubuchi, Toru Asai, Yasumasa Fujisaki

  2015, 2015 54TH IEEE CONFERENCE ON DECISION AND CONTROL (CDC), 2016-February, 2223 - 2228, English

  [Refereed]

  International conference proceedings


• Randomized Solution for Robust Optimal Power Flow

  Takayuki Wada, Ryosuke Morita, Toru Asai, Izumi Masubuchi, Yasumasa Fujisaki

  IEEE, Dec. 2014, Proceedings of the 53rd IEEE Conference on Decision and Control, 5195 - 5200, English

  [Refereed]

  International conference proceedings


• ロバストa%整定時間制御について

  OHTA YUZO, トウ 宇川, MASUBUCHI IZUMI

  電子情報通信学会, Nov. 2014, 信学技報, NLP2014(89) (89), 45 - 49, Japanese

  Symposium


• リファレンスガバナを用いたサーボプレスの制御

  渋谷 芳樹, OHTA YUZO, MASUBUCHI IZUMI

  近年,自動車部品や電子部品の加工に使われるプレス機械として，駆動原にサーボモータを用いたサーボプレスが注目されている．本稿では，リファレンスガバナを用いて，スライド変位やスライドとダイクッションの位置偏差などに拘束を加えた制御を行うことにより，サーボプレスの成形性能と生産性能の向上を図る．リファレンスガバナを用いた制御は，フィードバック制御なのでロバスト性を有し，モデル誤差などに対応できる．提案法の有効性はシミュレーションによって検証している．

  計測自動制御学会, Nov. 2014, 第57回自動制御連合講演会CD-ROM, 57, 324 - 329, Japanese

  Symposium


• Multi-agent optimization with local constraints via a subgradient method with delayed information of feasibility

  Izumi Masubuchi, Jun Tsukamoto, Takayuki Wada, Ryosuke Morita, Toru Asai, Yuzo Ohta, Yasumasa Fujisaki

  Jul. 2014, Proceedings of the 21st International Symposium on Mathematical Theory of Networks and Systems, 23 - 28, English

  [Refereed]

  International conference proceedings


• Distributed multi-Agent optimization via consensus of groups of agents that shares decision variables

  Izumi Masubuchi, Hiroyuki Ohgishi, Takayuki Wada, Ryosuke Morita, Toru Asai, Yuzo Ohta, Yasumasa Fujisaki

  Jul. 2014, Proceedings of the SICE Annual Conference, 886 - 891, English

  [Refereed]

  International conference proceedings


• 制約を有するI-PD 制御系設計に関する一考察

  OHTA YUZO, MASUBUCHI IZUMI

  システム制御情報学会, May 2014, 第58回システム制御情報学会研究発表講演会講演論文集, No. 333 - 6, Japanese

  Symposium


• 人工衛星を対象としたG スケーリングによるゲインスケジュールド補償器の設計

  SUZUKI YOSHINOBU, MASUBUCHI IZUMI, OHTA YUZO

  システム制御情報学会, May 2014, 第58回システム制御情報学会研究発表講演会講演論文集, 58, No. 321 - 6, Japanese

  Symposium


• ロバスト最適潮流計算の確率的解法

  Takayuki Wada, Ryosuke Morita, Toru Asai, Izumi Masubuchi, Yasumasa Fujisaki

  システム制御情報学会, May 2014, 第58回システム制御情報学会研究発表講演会講演論文集, No. 222 - 6, Japanese

  Symposium


• Randomized algorithms for optimal power flow

  Takayuki Wada, Ryosuke Morita, Toru Asai, Izumi Masubuchi, Yasumasa. Fujisaki

  May 2014, Proceedings of the 45th ISCIE International Symposium on Stochastic Systems Theory and Its Applications, 69 - 70, English

  [Refereed]

  International conference proceedings


• Convergence analysis of multi-agent consensus with noisy communication

  Ryosuke Morita, Takayuki Wada, Izumi Masubuchi, Toru Asai, Yasumasa. Fujisaki

  May 2014, Proceedings of the 45th ISCIE International Symposium on Stochastic Systems Theory and Its Applications, 157 - 158, English

  [Refereed]

  International conference proceedings


• 拘束システムに対するリファレンスガバナの実装

  GUO HAO, OHTA YUZO, MASUBUCHI IZUMI

  システム制御情報学会, Apr. 2014, システム制御情報学会論文誌, 27(4) (4), 187 - 192, English

  [Refereed]

  Scientific journal


• 有向グラフ構造を持つマルチエージェントシステムにおける平均化を用いる合意アルゴリズム

  MORITA RYOSUKE, WADA TAKAYUKI, MASUBUCHI IZUMI, ASAI TORU, FUJISAKI YASUMASA

  Mar. 2014, 第1回計測自動制御学会制御部門マルチシンポジウム, Japanese

  Symposium


• 切替時L2ゲインを用いた合意ネットワークのエッジ切替脆弱性解析

  MORIWAKI YUSUKE, ASAI TORU, WADA TAKAYUKI, MORITA RYOSUKE, MASUBUCHI IZUMI, FUJISAKI YASUMASA

  Mar. 2014, 第1回計測自動制御学会制御部門マルチシンポジウム, Japanese

  Symposium


• 時変の結合を有するネットワークにおけるローカルな制約条件の下での分散協調最適化

  TSUKAMOTO JUN, MASUBUCHI IZUMI, WADA TAKAYUKI, MORITA RYOSUKE, ASAI TORU, OHTA YUZO, FUJISAKI YASUMASA

  Mar. 2014, 第1回計測自動制御学会制御部門マルチシンポジウム, No. 5B3 - 5, Japanese

  Symposium


• 離散時間ゲインスケジュールド制御系設計のための新たなパラメータ依存LMI

  MASUBUCHI IZUMI, MATSUSAKA RYO, OHTA YUZO

  システム制御情報学会, Feb. 2014, システム制御情報学会論文誌, 27(2) (2), 36 - 41, English

  [Refereed]

  Scientific journal


• A Lyapunov-density criterion for almost everywhere stability of a class of Lipschitz continuous and almost everywhere C-1 nonlinear systems

  Izumi Masubuchi, Yuzo Ohta

  Feb. 2014, INTERNATIONAL JOURNAL OF CONTROL, 87(2) (2), 422 - 431, English

  [Refereed]

  Scientific journal


• On the Implementation of Reference Governor

  Ohta, Yuzo, Masubuchi, Izumi, IEEE

  2014, 40th Annual Conference of the Ieee Industrial Electronics Society (Iecon 2014)


• Randomized Solution for Robust Optimal Power Flow

  Takayuki Wada, Ryosuke Morita, Toru Asai, Izumi Masubuchi, Yasumasa Fujisaki

  2014, 2014 IEEE 53RD ANNUAL CONFERENCE ON DECISION AND CONTROL (CDC), 5195 - 5200, English

  [Refereed]

  International conference proceedings


• 整定時間を指定するサーボ系設計

  OHTA YUZO, TAKIYAMA TAKESHI, MASUBUCHI IZUMI

  In this paper, we treat 2 dimensional systems or systems which can be approximated as 2 dimensional systems. We will propose a PI control scheme of a servo system design that gives the shortest M% settling time and satisfies a percent overshoot requirement for an assigned M. The usefulness of the proposing method is demonstrated through examples.

  THE INSTITUTE OF SYSTEMS, CONTROL AND INFORMATION ENGINEERS (ISCIE), Jan. 2014, システム制御情報学会論文誌, 27(1) (1), 1 - 7, Japanese

  [Refereed]

  Scientific journal


• Multi-Agent Consensus with Noisy Communication via Time Averaging

  Ryosuke Morita, Takayuki Wada, Izumi Masubuchi, Toru Asai, Yasumasa Fujisaki

  2014, 2014 EUROPEAN CONTROL CONFERENCE (ECC), 1530 - 1535, English

  [Refereed]

  International conference proceedings


• On the Implementation of Reference Governor

  Yuzo Ohta, Izumi Masubuchi

  2014, IECON 2014 - 40TH ANNUAL CONFERENCE OF THE IEEE INDUSTRIAL ELECTRONICS SOCIETY, 40th Vol.1, 215 - 220, English

  [Refereed]

  International conference proceedings


• 雑音環境下でのコンセンサスアルゴリズムのディペンダビリティについて

  MORITA RYOSUKE, WADA TAKAYUKI, MASUBUCHI IZUMI, ASAI TORU, FUJISAKI YASUMASA

  Nov. 2013, 計測自動制御学会システム・情報部門学術講演会 2013, Japanese

  Symposium


• ディペンダブル制御に向けた分散協調最適化

  MASUBUCHI IZUMI, WADA TAKAYUKI, MORITA RYOSUKE, ASAI TORU, OHTA YUZO, FUJISAKI YASUMASA

  Nov. 2013, 計測自動制御学会システム・情報部門学術講演会 2013, 520 - 521, Japanese

  Symposium


• I-PD制御系設計に関する一考察

  OHTA YUZO, TAKIYAMA TAKESHI, MASUBUCHI IZUMI

  Nov. 2013, 第56回自動制御連合講演会, Japanese

  Symposium


• 入力の連続性を考慮したゲインスケジュールドリファレンスガバナを用いたハードディスクのロングシーク制御

  GUO HAO, OHTA YUZO, MASUBUCHI IZUMI

  In this paper, we propose a gain scheduled reference governor for control of systems with constraints on the state and/or input variables. We use the reference governor with outer feedback constructed via model following control method. We apply this control scheme to design of long seek control of hard disk drives. To achieve short seek time for long seek distance problems, we consider gain scheduling with the reference governor. With keeping the continuity of input, the control system switches feedback gains according to the location of the state. Moreover, we examine the usefulness of the proposed method by applying it to benchmark problems of hard disk drive control.

  The Society of Instrument and Control Engineers, Sep. 2013, 計測自動制御学会論文集, 49(9) (9), 832 - 839, Japanese

  [Refereed]

  Scientific journal


• Finite settling time control of constrained systems

  Yuzo Ohta, Yuchuan Tong, Izumi Masubuchi

  Sep. 2013, Proceedings of the 2013 International Symposium on Nonlinear Theory and its Applications, 90 - 93, English

  [Refereed]

  International conference proceedings


• 新たなLMI による離散時間ゲインスケジュールド制御系の設計

  MATSUSAKA RYO, MASUBUCHI IZUMI, OHTA YUZO

  May 2013, 第57回システム制御情報学会研究発表講演会, Japanese

  Symposium


• モデルフォロイング制御に関する一考察

  OHTA YUZO, TAKIYAMA TAKESHI, MASUBUCHI IZUMI

  May 2013, 第57回システム制御情報学会研究発表講演会, Japanese

  Symposium


• Stability and Stabilization of Discrete-Time Descriptor Systems with Several Extensions

  Izumi Masubuchi, Yuzo Ohta

  2013, 2013 EUROPEAN CONTROL CONFERENCE (ECC), 3384 - 3389, English

  [Refereed]

  International conference proceedings


• リアプノフ密度を用いた区分的に滑らかな非線形システムの安定解析について

  MASUBUCHI IZUMI, OHTA YUZO

  計測自動制御学会, Nov. 2012, 第55回自動制御連合講演会, 496 - 497, Japanese

  Symposium


• 対外乱抑制特性を利用した船舶の推力低減化位置制御

  HAMAMATSU MASANORI, KAWADA HISANOSUKE, KAGAYA HIROAKI, MASUBUCHI IZUMI

  計測自動制御学会 ; [196-]-, Oct. 2012, 計測自動制御学会論文集, 48(10) (10), 632 - 639, Japanese

  [Refereed]

  Scientific journal


• Model following control for systems with high-frequency resonant terms and unstable zeros

  GUO HAO, OHTA YUZO, MASUBUCHI IZUMI

  THE INSTITUTE OF SYSTEMS, CONTROL AND INFORMATION ENGINEERS (ISCIE), Oct. 2012, システム制御情報学会論文誌, 25(10) (10), 296 - 298, English

  [Refereed]

  Scientific journal


• Gain-Scheduled Control Using Switching

  OSAWA TATSUYA, MASUBUCHI IZUMI, OHTA YUZO

  システム制御情報学会, May 2012, 第56回システム制御情報学会研究発表講演会, 593 - 594, Japanese

  Symposium


• 最大出力許容集合の内側近似 第3報

  OHTA Yuzo, MASUBUCHI Izumi

  システム制御情報学会, May 2012, 第56回システム制御情報学会研究発表講演会, 475 - 476, Japanese

  Symposium


• モデルフォロイング制御に関する一考察

  GUO HAO, OHTA YUZO, MASUBUCHI IZUMI

  システム制御情報学会, May 2012, 第56回システム制御情報学会研究発表講演会, 569 - 570, Japanese

  Symposium


• LTI 補償器の切替によるゲインスケジュールド制御

  MASUBUCHI IZUMI, ISHII SHOTA, OHTA YUZO, SAEKI MASAMI

  計測自動制御学会, Mar. 2012, The 40th SICE Symposium on Control Theory, Japanese

  Symposium


• 不確かさを有する拘束系に対するROCの適用

  ARAKAWA Takuya, OHTA Yuzo, MASUBUCHI Izumi

  計測自動制御学会,システム制御情報学会, Jan. 2012, 平成23年度計測自動制御学会関西支部, Japanese

  Symposium


• Long seek control of hard disk drives using reference governor: An improved result

  Hao Guo, Yuzo Ohta, Takaaki Taguchi, Izumi Masubuchi

  2012, Proceedings of the 2012 7th IEEE Conference on Industrial Electronics and Applications, ICIEA 2012, 1951 - 1956, English

  [Refereed]

  International conference proceedings


• Gain Scheduled Reference Governor and its Application to Long Seek Control of Hard Disk Drives

  Hao Guo, Yuzo Ohta, Izumi Masubuchi

  2012, 38TH ANNUAL CONFERENCE ON IEEE INDUSTRIAL ELECTRONICS SOCIETY (IECON 2012), 38th Vol.5, 3802 - 3807, English

  [Refereed]

  International conference proceedings


• 最大出力許容集合の内側近似 第2報

  OHTA Yuzo, MASUBUCHI Izumi

  計測自動制御学会,システム制御情報学会,日本機械学会,化学工学会,精密工学会,日本航空宇宙学会, Nov. 2011, 第54回自動制御連合講演会, No. 2C305, Japanese

  Symposium


• リファレンスガバナと2自由度構成を用いたハードディスクのヘッドシーク制御

  GUO Hao, OHTA Yuzo, MASUBUCHI Izumi

  計測自動制御学会,システム制御情報学会,日本機械学会,化学工学会,精密工学会,日本航空宇宙学会, Nov. 2011, 第54回自動制御連合講演会, No. 2C304, Japanese

  Symposium


• マルチレートサンプリングを用いた拘束系の有限整定制御

  TONG Yu Chuan, OHTA Yuzo, MASUBUCHI Izumi

  計測自動制御学会,システム制御情報学会,日本機械学会,化学工学会,精密工学会,日本航空宇宙学会, Nov. 2011, 第54回自動制御連合講演会, No. 2C401, Japanese

  Symposium


• サーボ系の2自由度構成を用いた拘束系の制御

  NAKAI Yuuya, OHTA Yuzo, MASUBUCHI Izumi

  計測自動制御学会,システム制御情報学会,日本機械学会,化学工学会,精密工学会,日本航空宇宙学会, Nov. 2011, 第54回自動制御連合講演会, No. 2C402, Japanese

  Symposium


• 最大許容出力集合の内側近似を用いた拘束系の制御

  OHTA YUZO, SEKI YUUKI, GUO HAO, MASUBUCHI IZUMI

  THE INSTITUTE OF SYSTEMS, CONTROL AND INFORMATION ENGINEERS (ISCIE), Oct. 2011, システム制御情報学会論文誌, 24(10) (10), 255 - 257, Japanese

  [Refereed]

  Scientific journal


• Stability Analysis and Stabilization of Piecewise-Smooth Systems via Density Functions

  MASUBUCHI IZUMI, OHTA YUZO

  計測自動制御学会, Sep. 2011, The 40th SICE Symposium on Control Theory, 233 - 236, Japanese

  Symposium


• Density functions for analysis of positive invariance and convergence of trajectories for nonlinear systems with a piecewise-C2 vector field

  Izumi Masubuchi

  Sep. 2011, Proceedings of the 2011 International Symposium on Nonlinear Theory and its Applications, pp. 701-704, English

  [Refereed]

  International conference proceedings


• Gain-scheduled control via filtered scheduling parameters

  Izumi Masubuchi, Iori Kurata

  Aug. 2011, Automatica, 47(8) (8), 1821 - 1826, English

  [Refereed]

  Scientific journal


• Almost-everywhere stability of systems with a piecewise-ℂ 2 Lipschitz continuous vector field

  Izumi Masubuchi

  2011, IFAC Proceedings Volumes (IFAC-PapersOnline), 18(1) (1), 10928 - 10933, English

  [Refereed]

  International conference proceedings


• Seek control of hard disk drives using reference governor under input saturation

  Hao Guo, Yuzo Ohta, Izumi Masubuchi

  2011, 2011 International Conference on Electrical and Control Engineering, ICECE 2011 - Proceedings, 4955 - 4958, English

  [Refereed]

  International conference proceedings


• On robust synthesis of gain-scheduled controllers under stochastic measurement noise on the scheduling parameter

  Izumi Masubuchi, Yoshihisa Fujimoto

  Lead, Aug. 2010, Proceedings of the SICE Annual Conference 2010, 3043 - 3046, English

  [Refereed]

  International conference proceedings


• Exactness verification of upper-bound relaxations derived via parameter-dependent multipliers for rational uncertainty blocks

  Daisuke Maruyama, Izumi Masubuchi

  Last, 2010, Proceedings of the IEEE International Symposium on Computer-Aided Control System Design, 743 - 748, English

  [Refereed]

  International conference proceedings


• Stability Analysis and Stabilization of Nonlinear Systems via Locally Defined Density Functions

  Izumi MASUBUCHI

  This paper considers local stability analysis of nonlinear systems with deriving a positively invariant set based on the Rantzer's stability theory by using density functions. We define a notion of locally defined density functions around an equilibrium that give monotonously increasing positive measures near the equilibrium of a nonlinear system. Under certain assumptions, it is shown that some level set of a locally defined density function is a positively invariant set where almost all of the system trajectories converge to the equilibrium. We also mention an SOS (sum-of-squares) formulation for synthesis of a nonlinear gain via locally defined density functions.

  Lead, The Society of Instrument and Control Engineers, 2010, SICE Journal of Control, Measurement, and System Integration, 3(6) (6), 424 - 428, English

  [Refereed]

  Scientific journal


• A design method of an active front steering controller using measurements of lateral tire forces

  Nobutaka Wada, Akihiro Takahashi, Izumi Masubuchi, Masami Saeki

  Japan Society of Mechanical Engineers, 2010, Nihon Kikai Gakkai Ronbunshu, C Hen/Transactions of the Japan Society of Mechanical Engineers, Part C, 76(770) (770), 2528 - 2535, Japanese

  [Refereed]

  Scientific journal


• On Use of Filtered Parameters in Gain-Scheduled Control

  MASUBUCHI Izumi, KURATA Iori

  This paper proposes a method to design gain-scheduled controllers by using LMIs that depend on filtered scheduling parameters. This avoids the drawback of previous results that require differentiation of scheduling parameters. Moreover, with small damping time of the filter, our gain-scheduled controllers recover performance of those previous unimplementable controllers that need accurate derivative of parameters.

  The Society of Instrument and Control Engineers, Sep. 2009, Transactions of the Society of Instrument and Control Engineers, 45(9) (9), 469 - 475, Japanese

  [Refereed]


• Stability analysis of nonlinear systems via locally defined density functions

  Izumi Masubuchi

  Lead, Aug. 2009, Proceedings of the ICROS-SICE International Joint Conference 2009, 2454 - 2457, English

  [Refereed]

  International conference proceedings


• A recursive algorithm of exactness verification of relaxations for robust SDPs

  Izumi Masubuchi, Carsten W. Scherer

  Aug. 2009, Systems and Control Letters, 58(8) (8), 592 - 601, English

  [Refereed]

  Scientific journal


• Gain-scheduled controller synthesis via lyapunov matrices that depend on the filtered scheduling parameter

  Izumi Masubuchi, Iori Kurata

  2009, Proceedings of the 2009 IEEE International Conference on Networking, Sensing and Control, ICNSC 2009, 635 - 640, English

  [Refereed]

  International conference proceedings


• Gain-scheduled control synthesis by using filtered scheduling parameters

  Izumi Masubuchi, Iori Kurata

  2009, Proceedings of the IEEE Conference on Decision and Control, 2180 - 2185, English

  [Refereed]

  International conference proceedings


• Gain-scheduled controller synthesis based on new LMIs for dissipativity of descriptor LPV systems

  Izumi Masubuchi, Atsushi Suzuki

  Lead, Jul. 2008, Proceedings of the 17th IFAC World Congress, 9993 - 9998

  [Refereed]


• Analysis of positive invariance and almost regional attraction via density functions with converse results

  Izumi Masubuchi

  Jul. 2007, IEEE Transactions on Automatic Control, 52(7) (7), 1329 - 1333, English

  [Refereed]

  Scientific journal


• Output feedback controller synthesis for descriptor systems satisfying closed-loop dissipativity

  Izumi Masubuchi

  Feb. 2007, Automatica, 43(2) (2), 339 - 345, English

  [Refereed]

  Scientific journal


• A Change-of-variables Method for Output Feedback Synthesis of Descriptor Systems Based on Realization-independent LMIs

  Izumi MASUBUCHI

  This paper considers LMI-based synthesis of output feedback controllers for descriptor systems based on changeof-variables methodology applied to a new criterion for dissipativity. Without depending on the choice of descriptor realization, a necessary and sufficient condition is obtained in terms of LMIs for existence of a controller with which the closed-loop system is admissible and dissipative.

  Lead, The Society of Instrument and Control Engineers, 2007, Transactions of the Society of Instrument and Control Engineers, 43(12) (12), 1151 - 1155, English

  [Refereed]

  Scientific journal


• Analysis of Nonlinear Systems in Specified Regions of the State Space by Using Density Functions Characterizing Positively Invariant Sets

  MASUBUCHI Izumi

  This paper is concerned with analysis of positive invariance and regional almost convergence of nonlinear systems by using density functions. It is shown that if there exists a density function that is positive inside a set and zero on its boundary then the set is positively invariant and almost all of the trajectories starting from the set are convergent. This result is applicable to controller synthesis for nonlinear systems by using convex optimization with satisfying state and input constraints. Furthermore, converse theorems are provided to ensure the existence of such density functions under mild assumptions.

  THE INSTITUTE OF SYSTEMS, CONTROL AND INFORMATION ENGINEERS (ISCIE), Dec. 2006, Transactions of the Institute of Systems, Control and Information Engineers, 19(12) (12), 453 - 461, Japanese

  [Refereed]


• Characterization of positively invariant sets by density functions

  Izumi Masubuchi

  Lead, Jul. 2006, Proceedings of the 17th International Symposium on Mathematical Theory of Networks and Systems, 1599 - 1607, English

  [Refereed]

  International conference proceedings


• H_∞ Control of Descriptor Systems : Solution Based on Realization-Independent LMIs

  MASUBUCHI Izumi

  This paper provides a new solution to the output feedback H_∞ control problem for descriptor systems. Unlike previous results, the proposed criterion for existence of H_∞, suboptimal controllers does not depend on the choice of the descriptor realization. The criterion is given in terms of LMIs, whose solution yields an H_∞ suboptimal controller.

  THE INSTITUTE OF SYSTEMS, CONTROL AND INFORMATION ENGINEERS (ISCIE), May 2006, Transactions of the Institute of Systems, Control and Information Engineers, 19(5) (5), 203 - 209, Japanese

  [Refereed]


• Gain scheduling controller design for two-rotor hovering system and its experimental verification

  Makoto Yamashita, Masami Saeki, Nobutaka Wada, Izumi Masubuchi

  May 2006, Journal of Robotics and Mechatronics, 18(5) (5), 589 - 597, English

  [Refereed]

  Scientific journal


• Dissipativity inequalities for continuous-time descriptor systems with applications to synthesis of control gains

  Izumi Masubuchi

  Feb. 2006, Systems and Control Letters, 55(2) (2), 158 - 164, English

  [Refereed]

  Scientific journal


• Characterization of Positively Invariant Sets and Almost Convergence of Trajectories of Nonlinear Systems via Density Functions

  Masubuchi Izumi

  This paper proposes a new method of regional stability analysis of nonlinear systems based on Rantzer's density functions, We show a sufficient condition in terms of density functions to guarantee positive invariance of a set and convergence of almost all trajectories therein. This condition leads to a convex formulation of synthesis with state and input constraints.

  The Institute of Systems, Control and Information Engineers, 2006, Proceedings of the Annual Conference of the Institute of Systems, Control and Information Engineers, 6, 247 - 247


• Stability analysis of hybrid automata with set-valued vector fields using sums of squares

  Izumi Masubuchi, Tokihisa Tsuji

  2006, IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences, E89-A(11) (11), 3185 - 3191, English

  [Refereed]

  Scientific journal


• PID gain tuning based on falsification using bandpass filters

  Masami Saeki, Osamu Hamada, Nobutaka Wada, Izumi Masubuchi

  2006, 2006 SICE-ICASE International Joint Conference, 4032 - 4037, English

  [Refereed]

  International conference proceedings


• Density functions characterizing positive invariance and regional almost attraction with converse results

  Masubuchi, Izumi, IEEE

  2006, Proceedings of the 45th Ieee Conference on Decision and Control, Vols 1-14, 5126 - 5131

  [Refereed]


• H ∞ control of descriptor systems based on realization-independent LMIs

  Izumi Masubuchi

  Lead, Aug. 2005, Proceedings of the SICE Annual Conference 2005, 2996 - 3000, English

  [Refereed]

  International conference proceedings


• Matrix inequality conditions for dissipativity of continuous-time descrip- tor systems and its application to synthesis of control gains

  Izumi Masubuchi

  Lead, Jul. 2005, Proceedings of the 16th IFAC World Congress

  [Refereed]


• How to Construct Asymptotically Exact Relaxations in Robust Control?

  SCHERER Carsten W., MASUBUCHI Izumi

  The Society of Instrument and Control Engineers, 2005, Journal of The Society of Instrument and Control Engineers, 44(8) (8), 519 - 533, English


• Identification of Continuous-Time Wiener-Type Nonlinear Model via a Subspace Method

  MASUBUCHI Izumi, MURAI Kazuhiro

  This paper is concerned with identification of continuous-time Wiener-type nonlinear model. A subspace method is applied to identify the linear dynamic element represented by δ-operator model transformed through Laguerre filters. The nonlinear part is estimated via least-squares approximation. Numerical simulation results are provided to illustrate the proposed identification method.

  THE INSTITUTE OF SYSTEMS, CONTROL AND INFORMATION ENGINEERS (ISCIE), 2005, Transactions of the Institute of Systems, Control and Information Engineers, 18(2) (2), 43 - 50, Japanese

  [Refereed]


• Synthesis of output feedback controllers for descriptor systems satisfying closed-loop dissipativity

  Izumi Masubuchi

  2005, Proceedings of the 44th IEEE Conference on Decision and Control, and the European Control Conference, CDC-ECC '05, 2005, 5012 - 5017, English

  [Refereed]

  International conference proceedings


• Gain-Scheduling Controller Synthesis Based on Descriptor Representations:Application to Design of Flight Vehicle Control

  MASUBUCHI Izumi, KATO Jun, SAEKI Masami, OHARA Atsumi

  This paper is concerned with a synthesis method of gain-scheduling controllers with utilizing descriptor representations and its application to design of flight vehicle control. By representing a linear parameter-varying plant in a descriptor form, parameter-dependent LMIs to seek a gain-scheduling controller are formulated so that the LMIs have simple structure with respect to the parameter. A gain-scheduling controller is computed directly via an explicit formula in terms of the variable of LMIs for descriptor LPV systems. This synthesis procedure is applied to design of a flight vehicle control with large variation of dynamics and multiple control specifications. It is shown that the obtained gain-scheduling controller attains all the specifications and control performance is improved by employing parameter-dependent Lyapunov matrices.

  The Society of Instrument and Control Engineers, 2005, Transactions of the Society of Instrument and Control Engineers, 41(1) (1), 53 - 60, Japanese

  [Refereed]


• Computation of Lyapunov functions for hybrid automata via LMIs

  Masubuchi, I, S Yabuki, T Tsuji

  Nov. 2004, IEICE TRANSACTIONS ON FUNDAMENTALS OF ELECTRONICS COMMUNICATIONS AND COMPUTER SCIENCES, E87A(11) (11), 2937 - 2943, English

  [Refereed]

  Scientific journal


• Realization-Independent Condition for Dissipativity of Descriptor Systems

  Izumi Masubuchi

  This paper proposes a generalized KYP-type matrix inequality that provides a necessary and sufficient condition of dissipativity of descriptor systems. While known bounded or positive-real inequalities are only valid for descriptor systems with particular realization of them, the proposed inequality condition is independent of the realization of descriptor systems. Thus the new inequality is used for analysis of descriptor systems with freely selected realization. Further, the proposed inequality is applicable not only to bounded and positive-realness but to dissipativity with respect to supply rates given by an arbitrary quadratic form of the input and the output.

  The Society of Instrument and Control Engineers, Aug. 2004, Transactions of the Society of Instrument and Control Engineers, 40(8) (8), 867 - 869, English

  [Refereed]

  Scientific journal


• Dissipativity Inequality for Continuous-Time Descriptor Systems: A Realization-Independent Condition

  Izumi Masubuchi

  Jul. 2004, Proceedings of the 10th IFAC Symposium on Large Scale Systems: Theory and Applications, 417 - 420, English

  [Refereed]

  International conference proceedings


• Design of Output Feedback Gain Scheduling Control Systems via Descriptor Representations

  MASUBUCHI IZUMI, AKIYAMA TOMOAKI, SAEKI MASAMI

  This paper is concerned with an approach to design of output-feedback gain-scheduling controllers via solving LMIs, based on descriptor representation of linear parameter varying (LPV) systems. Algebraic constraints of the descriptor form can reduce a state space LPV model with complex functions of scheduling parameters to a descriptor LPV model with simplified functions of the parameters. By change-of-variables technique, LMI conditions are derived for design of output feedback gain-scheduling controllers for descriptor LPV systems. A numerical example is provided to illustrate the proposed method.

  THE INSTITUTE OF SYSTEMS, CONTROL AND INFORMATION ENGINEERS (ISCIE), May 2004, Transactions of the Institute of Systems, Control and Information Engineers, 17(5) (5), 196 - 201, Japanese

  [Refereed]

  Scientific journal


• Gain scheduling controller design for two rotor hovering system

  M Yamashita, M Saeki, N Wada, Masubuchi, I

  2004, SICE 2004 ANNUAL CONFERENCE, VOLS 1-3, 1196 - 1201, English

  [Refereed]

  International conference proceedings


• Gain-scheduled controller design based on descriptor representation of LPV systems: Application to flight vehicle control

  Masubuchi, I, J Kato, M Saeki, A Ohara

  2004, 2004 43RD IEEE CONFERENCE ON DECISION AND CONTROL (CDC), VOLS 1-5, 815 - 820, English

  [Refereed]

  International conference proceedings


• Stabilization of Implicit Systems via Interconnection

  MASUBUCHI IZUMI

  This paper is concerned with stabilization of implicit systems via interconnection. Stability of implicit systems is defined so that every solution in the sense of Impulsive-Smooth Behavior is impulseless and convergent. Preservation of the initial values of the implicit system (initial-freedom preservation) through interconnection is adopted as a formulation of regularity of interconnection. In order to analyze stabilization with initial-freedom preservation, we define notions of complete-stabilizability and zero-detectability that generalize stabilizability and detectability of state space systems. It is shown that stabilizability via, interconnection with initial-freedom preservation is equivalent to complete-stabilizability and zero-detectability. Thus standard results on output feedback stabilization of state-space systems are extended to stabilization of implicit systems via interconnection. Further, we provide criteria for each of complete-stabilizability and zero-detectability in terms of the Kronecker form, Lyapunov equation and inequality, rank and invertibility of the system pencil.

  The Society of Instrument and Control Engineers, Jun. 2003, Transactions of the Society of Instrument and Control Engineers, 39(6) (6), 544 - 551, Japanese

  [Refereed]

  Scientific journal


• Synthesis of output feedback gain-scheduling controllers based on descriptor LPV system representation

  Masubuchi, I, T Akiyama, M Saeki

  2003, 42ND IEEE CONFERENCE ON DECISION AND CONTROL, VOLS 1-6, PROCEEDINGS, 6115 - 6120, English

  [Refereed]

  International conference proceedings


• On Stability Analysis of Switched Systems and Its Applications

  MASUBUCHI IZUMI

  This paper is concerned with stability analysis of switched systems and its application for synthesis problems. For a class of switched systems, we propose a discontinuous Lyapunov-like function to derive a condition that guarantees exponential stability of switched systems. This condition is stated with LMIs for switched systems that have linear continuous dynamics and an output feedback switch-scheduled control design method is presented in terms of LMIs. These results are applied to control design of a class of nonholonomic systems in the time-state control form.

  THE INSTITUTE OF SYSTEMS, CONTROL AND INFORMATION ENGINEERS (ISCIE), May 2002, Transactions of the Institute of Systems, Control and Information Engineers, 15(5) (5), 262 - 269, Japanese

  [Refereed]

  Scientific journal


• Construction of Piecewise Linear Lyapunov Functions and Its Fast Method

  OHTA YUZO, MASUBUCHI IZUMI, YAMAMOTO KENICHIRO

  In this paper, the issue of constructing piecewise linear Lyapunov functions (PWLLF) for stability analysis of nonlinear systems satisfying generalized sector conditions is addressed. The existence condition of PWLLF is represented by a linear programming problem (LP in brief). If the optimal value of the LP is negative, then PWLLF is constructed by using the optimal solution of it. When the optimal value of the LP is nonnegative, the candidate of PWLLF is modified with additional freedom and a new LP is formulated corresponding to the new PWLLF candidiate. It is shown that the optimal value of the resulting new LP is always less than or equal to that of the old LP. The main purpose of this paper is to propose a fast method to solve LPs which appear repeatedly in constructing PWLLF. The method is based on a kind of sensitivity analysis approach of LP and utilizes the special structure of LPs that appears in constructing PWLLF.

  THE INSTITUTE OF SYSTEMS, CONTROL AND INFORMATION ENGINEERS (ISCIE), Aug. 2001, Transactions of the Institute of Systems, Control and Information Engineers, 14(8) (8), 402 - 408, Japanese

  [Refereed]

  Scientific journal


• Dynamic controller synthesis guaranteeing L-2-gain for time-controlled switched systems

  Masubuchi, I, M Tsutsui

  2001, PROCEEDINGS OF THE 2001 AMERICAN CONTROL CONFERENCE, VOLS 1-6, 874 - 879, English

  [Refereed]

  International conference proceedings


• Advanced performance analysis and robust controller synthesis for time-controlled switched systems with uncertain Switchings

  Masubuchi, I, M Tsutsui

  2001, PROCEEDINGS OF THE 40TH IEEE CONFERENCE ON DECISION AND CONTROL, VOLS 1-5, 2466 - 2471, English

  [Refereed]

  International conference proceedings


• Explicit Representation of the Solution Set of SISO q-Markov COVERs

  MASUBUCHI IZUMI, 岩橋 宏晃, OHTA YUZO

  計測自動制御学会, Apr. 2000, Transactions of the Society of Instrument and Control Engineers, 36(4) (4), 335 - 339, Japanese

  [Refereed]

  Scientific journal


• On design of controllers for linear switched systems with guaranteed H2-type cost

  Izumi Masubuchi

  2000, Proceedings of the 14th International Symposium of Mathematical Theory of Networks and Systems, 13, CD - ROM, English

  [Refereed]

  International conference proceedings


• Numerical solution to a class of parameter-dependent convex differential inequalities

  Izumi Masubuchi

  In this paper, we propose a numerical solution to a class of parameter-dependent convex differential inequalities (PDCDIs), including parameter-dependent LMIs formulated in analysis and synthesis of control systems based on linear parameter varying system representations. To solve such inequality problems involving infinite inequalities corresponding to the values of the parameter, we provide a procedure to derive from a given PDCDI a finite set of inequalities that can be formed to be solvable whenever the PDCDI is solvable, and from any solution to the derived finite set of inequalities a solution to the PDCDI is obtained. Numerical examples for a parameter-dependent LMI are provided to examine the proposed numerical solution.

  The Society of Instrument and Control Engineers, 2000, 計測自動制御学会論文集, 36(3) (3), 248 - 254, English

  [Refereed]

  Scientific journal


• Stability and stabilization of implicit systems

  Masubuchi, I

  2000, PROCEEDINGS OF THE 39TH IEEE CONFERENCE ON DECISION AND CONTROL, VOLS 1-5, 3636 - 3641, English

  [Refereed]

  International conference proceedings


• On Design of Robustly Stable Servosystems with Feedback and Feedforward Gains

  MASUBUCHI IZUMI, YONEYAMA SEIJIRO, OHTA YUZO

  THE INSTITUTE OF SYSTEMS, CONTROL AND INFORMATION ENGINEERS (ISCIE), Dec. 1999, Transactions of the Institute of Systems, Control and Information Engineers, 12(12) (12), 757 - 759, Japanese

  [Refereed]

  Scientific journal


• On numerical solution to parameter-dependent convex differential inequalities

  Izumi Masubuchi

  Dec. 1999, Proceedings of the 38th IEEE Conference on Decision and Control, 305 - 309, English

  [Refereed]

  International conference proceedings


• Design of Nonlinear Robust Servosystems by Using LMIs

  OHTA YUZO, MASUBUCHI IZUMI

  In this paper, we consider a design problem of robust nonlinear servosystems which can achieve asymptotic tracking for constant reference inputs. The problem setting in this paper is a little bit different from the usual one. We suppose that the reference input will change from r to r^* at time t = 0 and that the initial state of the system is located in a neighborhood of the equilibrium corresponding to the reference input r. Under this setting, we consider a design problem of robust nonlinear servosystems : we consider an augment system including the integrator, design a state feedback gain for the augment system using LMI, and give an input r (t) interpolating r and r^* so that the state moves the prescribed regions depending r (t) and consequently the output converges to r^*.

  THE INSTITUTE OF SYSTEMS, CONTROL AND INFORMATION ENGINEERS (ISCIE), Nov. 1999, Transactions of the Institute of Systems, Control and Information Engineers, 12(11) (11), 671 - 679, Japanese

  [Refereed]

  Scientific journal


• An exact solution to parameter-dependent convex differential inequalities

  Izumi Masubuchi

  Aug. 1999, Proceedings of the 1999 European Control Conference, CD - ROM, English

  [Refereed]

  International conference proceedings


• On Application of the Descriptor Form to Design of Gain Scheduling Systems

  MASUBUCHI IZUMI, SHIMEMURA ESUJIRO

  The descriptor form provides system representations that preserve structure of systems along with static constraints on descriptor variables. Based on the descriptor-form representations of LPV (linear parameter varying) -systems, this paper proposes an approach to gain-scheduling controller synthesis. First, we show a descriptor form with scheduling parameters on the coefficient matrices and discuss using it as a model of LPV-systems. Next, we give a synthesis method of quadratically stabilizing LPV-controllers via solving LMIs for both state-feedback and output-feedback systems.

  THE INSTITUTE OF SYSTEMS, CONTROL AND INFORMATION ENGINEERS (ISCIE), Jul. 1999, Transactions of the Institute of Systems, Control and Information Engineers, 12(7) (7), 390 - 394, Japanese

  [Refereed]

  Scientific journal


• Gain-Scheduling Control System Synthesis Based on Spline-Type Parameter-Dependent Quadratic Forms

  MASUBUCHI IZUMI, SHIMEMURA ETSUJIRO

  Mar. 1999, Transactions of the Society of Instrument and Control Engineers, 35(3) (3), 319 - 325, Japanese

  [Refereed]

  Scientific journal


• Stability analysis of implicit systems with possible impulses

  MASUBUCHI IZUMI, SHIMEMURA ETSUJIRO

  Jan. 1999, Transactions of the Society of Instrument and Control Engineers, 35(1) (1), 66 - 70, Japanese

  [Refereed]

  Scientific journal


• LMI-based controller synthesis: A unified formulation and solution

  Izumi Masubuchi, Atsumi Ohara, Nobuhide Suda

  John Wiley and Sons Ltd, 1998, International Journal of Robust and Nonlinear Control, 8(8) (8), 669 - 686, English

  [Refereed]

  Scientific journal


• Spline-type solution to parameter-dependent LMIs

  Masubuchi, I, A Kume, E Shimemura

  1998, PROCEEDINGS OF THE 37TH IEEE CONFERENCE ON DECISION AND CONTROL, VOLS 1-4, 1753 - 1758, English

  [Refereed]

  International conference proceedings


• A generalized Lyapunov inequality for implicit systems

  Izumi Masubuchi, Etsujiro Shimemura

  Jun. 1997, Proceedings of the 2nd Asian Control Conference, 2, 327 - 330, English

  [Refereed]

  International conference proceedings


• H-infinity control for descriptor systems: A matrix inequalities approach

  Masubuchi, I, Y Kamitane, A Ohara, N Suda

  Apr. 1997, Automatica, 33(4) (4), 669 - 673, English

  [Refereed]

  Scientific journal


• An LMI condition for stability of implicit systems

  Masubuchi, I, E Shimemura

  1997, PROCEEDINGS OF THE 36TH IEEE CONFERENCE ON DECISION AND CONTROL, VOLS 1-5, 779 - 780, English

  [Refereed]

  International conference proceedings


• Robust multi-objective controller design via convex optimization

  Masubuchi, I, A Osaka, N Suda

  1996, PROCEEDINGS OF THE 35TH IEEE CONFERENCE ON DECISION AND CONTROL, VOLS 1-4, 263 - 264, English

  [Refereed]

  International conference proceedings


• A unified synthesis method of controllers that satisfy LMI-conditions

  MASUBUCHI IZUMI, OHARA ATSUMI, SUDA NOBUHIDE

  Oct. 1995, Transactions of the Society of Instrument and Control Engineers, 31(10) (10), 1586 - 1594, Japanese

  [Refereed]

  Scientific journal


• LMI-based output feedback controller design - Using a convex parametrization of full-order controllers

  MASUBUCHI, I, A OHARA, N SUDA

  1995, PROCEEDINGS OF THE 1995 AMERICAN CONTROL CONFERENCE, VOLS 1-6, 3473 - 3477, English

  [Refereed]

  International conference proceedings


• Robust Stabilization of Descriptor Systems via State Fedback

  MASUBUCHI IZUMI, OHARA ATSUMI, SUDA NOBUHIDE

  This paper proposes a new design method of robust stabilizing state feedback gains for uncertain descriptor systems. The method involves solving certain linear matrix inequalities, which guarantee that closed loop systems have neither impulsive modes nor unstable exponential modes subject to the uncertainties.

  The Society of Instrument and Control Engineers, Dec. 1994, Transactions of the Society of Instrument and Control Engineers, 30(12) (12), 1553 - 1555, Japanese

  [Refereed]

  Scientific journal


• A Design of Robust Servosystems for Structured Uncertain Plants

  MASUBUCHI IZUMI, OHARA ATSUMI, SUDA NOBUHIDE

  This paper proposes a design method of robust servosystems. The plant we consider is assumed to have structured uncertainties which are represented by matrix polytopes in the state space equation. We construct the control system as follows. First, we quadratically stabilize the control system containing a integral compensator and guarantee to track a constant reference signal. Next, closed-loop poles are clustered robustly in a specified region. Further, we give an upper bound of tracking errors of controlled output and control input in L₂ norm sense and minimize it subject to the uncertainties. To construct a compensator, we parametrize stabilizing compensators and reduce the above design problem to a convex optimization on the parameter space.

  The Society of Instrument and Control Engineers, Sep. 1994, Transactions of the Society of Instrument and Control Engineers, 30(9) (9), 1051 - 1059, Japanese

  [Refereed]

  Scientific journal


• Robust Controller Design Using Parametrization of Stabilizing State Feedback Gains

  OHARA ATSUMI, MASUBUCHI IZUMI, SUDA NOBUHIDE

  計測自動制御学会, May 1994, Transactions of the Society of Instrument and Control Engineers, 30(5) (5), 527 - 536, Japanese

  [Refereed]

  Scientific journal


• QUADRATIC STABILIZATION AND ROBUST DISTURBANCE ATTENUATION USING PARAMETRIZATION OF STABILIZING STATE-FEEDBACK GAINS - CONVEX-OPTIMIZATION APPROACH

  A OHARA, MASUBUCHI, I, N SUDA

  1993, PROCEEDINGS OF THE 1993 AMERICAN CONTROL CONFERENCE, VOLS 1-3, 2816 - 2820, English

  [Refereed]

  International conference proceedings


• A SIMPLE Q-MARKOV COVER ALGORITHM FOR SISO DISCRETE-TIME-SYSTEMS BASED ON STATE COVARIANCE ASSIGNMENT

  A OHARA, MASUBUCHI, I, N SUDA

  1992, 1992 IEEE INTERNATIONAL SYMPOSIUM ON CIRCUITS AND SYSTEMS, VOLS 1-6, 2394 - 2397, English

  [Refereed]

  International conference proceedings

• 「無限次元システムの解析と制御」特集号を企画して

  増淵 泉

  Lead, Aug. 2021, システム／制御／情報, 65(8) (8), 303 - 304, Japanese

  [Refereed]

  Introduction scientific journal


• European Control Conference 2013 に参加して

  MASUBUCHI IZUMI

  Mar. 2014, システム／制御／情報, 58(3) (3), 132 - 132, Japanese

  [Invited]

  Meeting report


• On Design of Servo Systems Using the Phase Margin

  太田 有三, 瀧山 武, 増淵 泉

  システム制御情報学会, 15 May 2013, システム制御情報学会研究発表講演会講演論文集, 57, 6p, Japanese


• 最適化と制御 －LMI再訪－

  MASUBUCHI IZUMI

  Apr. 2013, 計測と制御, 52(4) (4), 310 - 315, Japanese

  [Invited]

  Introduction scientific journal


• Seek Control of Hard Disk Divers using Referene Governor with Outer Feedback

  昊 郭, 太田 有三, 増淵 泉

  神戸大学大学院工学研究科, 2011, 神戸大学大学院工学研究科・システム情報学研究科紀要, 3, 68 - 73, Japanese

  Link to Kobe Univ. Repository (Kernel)


• A08 A Design Method of an Active Front Steering Controller Using Measurements of Lateral Tire Forces

  Wada Nobutaka, Takahashi Akihiro, Masubuchi Izumi, Saeki Masami

  We propose a design method of an active front wheel steering controller that guarantees closed-loop stability under the rear tire side forces saturation. The proposed controller utilizes the information on the rear tire side forces to counteract the destabilizing effects caused by the rear tire side force saturation. The controller can suppress the magnitude of the slip angle while the rear tire side forces are saturated. The effectiveness of the proposed method is shown through numerical simulations.

  The Japan Society of Mechanical Engineers, 01 Sep. 2009, Dynamics and Design Conference, 2009(11) (11), 41 - 46, Japanese


• Control of Hybrid Systems-V : Analysis and Control of Switched Systems

  MASUBUCHI Izumi, ZHAI Guisheng

  Institute of Systems, Control and Information Engineers, 15 Jan. 2008, Systems, control and information, 52(1) (1), 25 - 31, Japanese


• Density Functions : A New Approach to Stability Analysis of Nonlinear Systems

  MASUBUCHI Izumi

  Institute of Systems, Control and Information Engineers, 15 May 2007, Systems, control and information, 51(5) (5), 203 - 208, Japanese


• 803 Analysis of local stability for nolinear systems via a dual of Lyapunov Theorem

  dohi Yutaka, Masubuchi Izumi, Saeki Masami

  The Japan Society of Mechanical Engineers, 23 Feb. 2006, 講演論文集, 2006(44) (44), 303 - 304, Japanese


• 805 Multiobjective Control System Design Based on Q-Parameterization of Controllers

  Yonetani Kenji, Masubuchi Izumi, Saeki Masami

  The Japan Society of Mechanical Engineers, 23 Feb. 2006, 講演論文集, 2006(44) (44), 307 - 308, Japanese


• Applications of Robust Matrix Inequalities to System and Control

  MASUBUCHI Izumi, OHARA Atsumi

  The Society of Instrument and Control Engineers, 2005, Journal of The Society of Instrument and Control Engineers, 44(8) (8), 561 - 567, Japanese


• ゲインスケジューリング制御

  MASUBUCHI IZUMI

  Nov. 2003, 計測自動制御学会「SICEセミナー 実践的な制御系設計」テキスト, 1 - 14, Japanese

  [Invited]

  Lecture materials


• New Methods for Analysis and Synthesis of Gain-Scheduling Control Systems and Its Application to Flight Control System Design

  MASUBUCHI Izumi, KATO Jun, SAEKI Masami

  The Japan Society of Mechanical Engineers, 24 Feb. 2003, 講演論文集, 2003(41) (41), 345 - 346, Japanese


• Stability Analysis of Hybrid Dynamical Systems

  山本 茂, MASUBUCHI IZUMI

  Mar. 2002, Systems, Control and Information, 46(3) (3), 120 - 128, Japanese

  [Invited]

  Introduction scientific journal


• Design of Output-Feedback Gain-Scheduling Controllers via Descriptor Representations

  MASUBUCHI I.

  2002, Proc. the 31st SICE Symposium on Control Theory, 313


• Stability Analysis of Systems Based on Implicit Representations

  MASUBUCHI IZUMI

  Apr. 2000, Systems, Control and Information, 44(4) (4), 177 - 183, Japanese

  [Invited]

  Introduction scientific journal


• Matrix Inequalities and Developments of Control Systems Design Methods

  OHARA ATSUMI, MASUBUCHI IZUMI

  システム制御情報学会, Jan. 1997, Systems, Control and Information, 41(1) (1), 28 - 34, Japanese

  [Invited]

  Introduction scientific journal


• LMI Approach to Control Systems Synthesis and Semidefinite Programming

  MASUBUCHI IZUMI, OHARA ATSUMI

  Oct. 1996, Journal of the Society of Instrument and Control Engineers, 35(10) (10), 743 - 750, Japanese

  [Invited]

  Introduction scientific journal

• Economically Enabled Energy Management

  Izumi Masubuchi, Takayuki Wada, Yasumasa Fujisaki, Fabrizio Dabbene

  Contributor, Chapter 11, Springer, Apr. 2020


• Encyclopedia of Control Systems

  NONAMI Kenzo, MIZUNO Tsuyoshi, ADACHI Shuichi, IDEDA Masao, OSUKA Koichi, OHIGATA Goro, KIDA Takashi, NAGAI Masao, HIRATA Mitsuo, MATSUNO Fumitoshi, Sharing authors, YOKOKOHJI YASUYOSHI, MASUBUCHI IZUMI

  Others, Asakura Publishing Co., LTD., Jul. 2015, Japanese

  Dictionary or encycropedia


• OHM大学テキスト 現代制御

  OHTA YUZO, FUJISAKI YASUMASA, MASUBUCHI IZUMI, FUKAO TAKANORI

  Joint work, オーム社, Mar. 2014, Japanese

  Textbook


• Control of Hybrid Systems

  JUN-ICHI IMURA, SHUN-ICHI AZUMA, MASUBUCHI IZUMI

  Joint work, Corona Publishing Co., Ltd., Jan. 2014, Japanese

  Scholarly book


• OHM大学テキスト 制御工学

  OHTA YUZO, KONISHI KEIJI, YASUDA TOSHIHIKO, TAKIYAMA TAKESHI, SAWADA YUICHI, MASUBUCHI IZUMI

  Joint work, オーム社, Nov. 2012, Japanese

  Textbook


• 機械工学便覧 デザイン編 β6 制御システム

  MASUBUCHI IZUMI

  Others, 日本機械学会, Apr. 2006, Japanese

  Scholarly book

• Distributed optimization over unbalanced networks

  MASUBUCHI IZUMI

  SICE 2018 Workshop: Cooperative Control for Energy Management Systems, Sep. 2018, English, Nara Kasugano International Forum, Nara, Japan, International conference

  Oral presentation

• IEEE


• 日本応用数理学会


• 日本数学会


• システム制御情報学会


• 計測自動制御学会

• 無限次元系に対する出力フィードバックゲインスケジュールド制御系設計法の構築

  増淵 泉

  日本学術振興会, 科学研究費助成事業, 基盤研究(C), 神戸大学, 01 Apr. 2023 - 31 Mar. 2027

  本年度は，線形作用素不等式による，無限次元次元線形システムに対する出力フィードバック制御則の設計法の構築を目標に研究を行った． １．線形作用素不等式の性質を調べた．その出発点となるヒルベルト空間 X 上のリアプノフ方程式 PA + A^*P + Q = 0 においては，状態方程式に現れる生成作用素 A が非有界である場合には，エルミート作用素 Q が有界作用素（具体的には恒等作用素）のときエルミート作用素 P が X の中で不可逆になり得る．それに鑑み，本研究では作用素 P, Q および P の逆作用素のいずれか，あるいはすべてが非有界，あるいは，生成作用素 A に関する異なる次数の抽象的ソボレフ空間での有界作用素にとることを検討した．与えられた Q に対して P が存在するための条件や，作用素 P の性質について部分的な結果を得ている． ２．有限次元系においては，出力フィードバック制御則の状態方程式の係数および閉ループ系の二次形式リアプノフ関数を与える行列を未知数とする線形でない行列不等式（不等号は半正定値性の意味）を，変数変換と合同変換を通して，新たな変数についての線形行列不等式に等価的に帰着できる．無限次元系においても，形式上同様の議論ができ，例えば生成作用素 A が有界で，エルミート作用素による二次形式のレイリー商がの下限が厳密に正，上限が有界であることを要請すれば，ほぼ同様の（一部は異なる）結果が得られることを確かめた．他方， A や他の作用素が非有界の場合は，１．で述べたエルミート作用素のクラスとして様々なものが考えられることもあり，変数変換後のパラメータの作用素に関してもその定義域の設定について考察の余地がある．いくつかのケースについて不等式の性質を明らかにしている． 研究課題を進めるにあたり，国際学会，国内学会に参加し，情報収集を行った．


• 非線形ロバスト制御理論への数理的アプローチの深化

  増淵 泉

  学術研究助成基金助成金／基盤研究(C), Apr. 2018 - Mar. 2023, Principal investigator

  Competitive research funding


• 実用的な制御系の設計と実装に関する研究

  太田 有三

  学術研究助成基金助成金／基盤研究(C), Apr. 2014 - Mar. 2019

  Competitive research funding


• 高機能ロバスト非線形制御系設計法の構築

  増淵 泉

  学術研究助成基金助成金／基盤研究(C), Apr. 2014 - Mar. 2018, Principal investigator

  Competitive research funding


• Robust Optimization for Robust/Nonlinear Control Problems with Nonlinear Structures

  OISHI Yasuaki, TAKAMI Isao, CHEN Gan, MASUBUCHI Izumi, EBIHARA Yoshio

  Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (C), Nanzan University, 2009 - 2011

  For the application to robust and nonlinear control problems possessing nonlinear structures, robust optimization methods are investigated on their theoretical properties, their applicability, and their usefulness in the control application. In particular, the exactness verification method is generalized for robust optimization problems with function variables. An asymptotically exact method is developed for robust optimization problems with non-polynomial parameter dependence. Gain-scheduled control is considered for a crane with a robust optimization method. Analysis and synthesis of an aperiodic sampled-data control system, which is a new type of control systems, are considered in the framework of robust optimization.


• Development of Synthesis Methods of Robust Nonlinear Control Systems Based on Numerical Optimization

  MASUBUCHI Izumi

  Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (C), Hiroshima University, 2008 - 2010

  The objective of this research is to provide basic theory for robustness analysis, nonlinear system analysis and numerical mythologies to efficiently solve problems in control, aimed to answer stringent requirements in practical control problems to design control systems that work under such as uncertainties and nonlinearities with guarantee of control performance. The outcomes of this research include advanced synthesis methods of gain-scheduled controllers, generalization of stability analysis by using Rantzer's density functions and its application to synthesis of nonlinear control gains, and methods for robust SDPs focusing on numerical verification of strictness of relaxations of robust SDPs


• Robust Optimization Considering Nonlinear Structure and Its Application to Nonlinear Control

  OISHI Yasuaki, MASUBUCHI Izumi, MASUBUCHI Izumi, TANAGORN Jennawasin

  Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (C), 2006 - 2008

  不確かなパラメータに非線形に依存するロバスト最適化問題について, 非線形構造を考慮して保守的でない解を得る方法を研究し, さらにその制御への応用を行なった. 具体的には, ロバスト最適化法の理論の研究として, 解法の誤差評価と適応的精度向上の研究を行ない, 合わせて解法が厳密になることの検証法を与えた. またロバスト最適化法の実用性向上の研究として, 疎構造の利用による計算量の抑制や, 未知関数を含むロバスト最適化問題のための解法の一般化を行なった. さらにロバスト最適化法の制御応用の研究として, 制約を持つ非線形系の切替え型制御への応用を行なった.


• インプリシト表現に基づくハイブリッドダイナミカルシステムの解析と設計

  増淵 泉

  日本学術振興会, 科学研究費助成事業, 若手研究(B), 広島大学, 2005 - 2007

  インプリシト表現されたハイブリッドダイナミカルシステムの性能解析および設計の理論の構築を目的とし,本年度は前年度得られた理論的な結果の発展を主な目的として研究を行い,研究成果の公表を国内・国際会議および論文の出版を通じて行った.まず基礎理論に関して以下の研究を行った. (1)昨年度に,インプリシト表現の一種であるディスクリプタシステムにおける消散性の新たな評価条件を導出した.本年度はこれに基づく制御系殺計法として,変数変換による方法と変数消去による方法との2種類を導出した.いずれの結果も,状態方程式で表されたシステムにおける線形行列不等式に基づく設計法をディスクリプタシステムに対して自然に拡張する形になっている.これらの成果は原著論文,国際会議論文として発表した. (2)ハイブリッドダイナミカルシステムの安走解析法として,従来よりリアプノフ関数を用いる方法を提案しているが,本年度はさらにハイブリッドダイナミカルシステムのベクトル場として集合値を取るものを扱える方法を導出した.安定解析の問題を,二乗和に関する凸最適化問題として解くことができる.この結果を原著論文として発表した. (3)ハイブリッドダイナミカルシステムの基礎となる非線形システムの新たな理論として,密度関数と呼ばれる関数による解析,設計方法に関する研究を行っている.本年度は,正不変性と解軌道の収束を同時に保証する密度関数の条件を導出し,さらにそのような密度関数が存在すること(逆定理)も示した.これらを原著論文,国際会議論文として発表した.さらに現在,非線形システムのベクトル場が大域的に連続微分可能でない場合について研究を行っており,その結果は密度関数の方法のハイブリッドダイナミカルシステムへの適用へと繋がるものである.


• インプリシト表現に基づく高機能制御システムの解析と設計

  増淵 泉

  日本学術振興会, 科学研究費助成事業, 若手研究(B), 広島大学, 2002 - 2004

  ゲインスケジューリングやロジックによる切替を伴う,高機能な制御システムの解析と設計について,インプリシト表現を用いる方法論に基づく理論研究及び設計手法の開発・計算機シミュレーションによる検証を行い,以下のような成果を得た. 1.ディスクリプタ表現を用いた解析のための新たな方法として,ディスクリプタシステムの消散性を判定するための線形行列不等式(LMI)条件を導出した.この条件は,従来研究と異なり,ディスクリプタ方程式の実現に依存せず常に正しく消散性を判定する.さらに,新たな不等式条件に基づく制御ゲインの設計法(LMIを用いる)を示した. 2.ディスクリプタ形式に基づく多目的ゲインスケジューリング制御系に関する研究として,指定する制御性能をスケジューリングパラメータを考慮して与えるという実用的なアイディアについて検討を行った.設計のためのLMIを導出し,飛行制御系の制御間題に適用して有効性を確認した. 3.さらに,ディスクリプタ形式に基づくゲインスケジューリング制御法を,非線形性の強いVTOL機の姿勢制御系設計を対象に行った.従来法で問題であった,LPVモデルを導出する際の保守性を減じることができる.シミュレーションを通して,新たな設計法の有効性の検討を行った. 4.非線形ハイブリッドシステムの安定解析法として,二乗和を用いる方法について,より見通しのよいLMI条件の記述を導出した.さらに自動的にリアプノフ関数を生成するプログラムの実装を行った.従来と異なり,数式処理的な部分についても自動的に計算が行われる.いくつかの安定解析問題の例により,その有効性を確認した. 以上の成果は,学術論文・国際会議・国内学会にて発表もしくは発表のため投稿中である.


• Analysis and Design of Control Systems Utilizing Data Structure and Algorithms

  OHTA Yuzo, MASUBUCHI Izumi, FUJISAKI Yasumasa

  Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (C), Kobe University, 2001 - 2002

  The main results obtained through the research are summarized as follows. 1. Development of CAD system for robust controllers design of linear systems. We developed a CAD system for robust controllers design of linear systems using value sets. For systems, which have completely decomposable, transfer functions and/or characteristic equations, the method using polygon interval arithmetic is very useful to compute value sets. We proposed and implemented a method computing value sets of multi-polynomial functions, which need not be completely decomposable. 2. Generation of piecewise linear Ly apunov functions. We proposed a new class of piecewise linear Lyapunov functions (PLLFs) and derived stability results. A candidate of PLLF has parameters corresponding to hyperplanes intersecting stability region. The set of stability conditions are formulated as Linear Programming Problem (LP) in terms of parameters inserted by the hyperplanes. If the computed optimal value is negative, we construct a PWLLF using the solution. When the optimal value of the LP is nonnegative, we modify the PWLLF candidate by adding appropriate hyperplanes to introduce more freedom in the LP formulation and arrive at the desired result. The optimal value of the resulting new LP is always less than or equal to that of the old LP. We also proposed a scheme to generate hyperplanes such that the optimal value of the new LPs is less than that of the old LP. Moreover, we propose a fast method to compute the optimal solution of the new LP. 3. Data structure for Euclidean cell complex. We proposed and implemented data structure for Euclidean cell complex. We used this data structure in programs for generation of PLLFs and will be used for controller design using PLLFs 4. Solution method of bilinear optimization problems. The main issue in designing controllers using PLLFs is to solve bilinear optimization problems, which is non-convex problems, and, hence, it is not so easy to solve. But we believe that the problem rather easy to solve that bilinear matrix inequality problems. We proposed a method using Zoutendijk method. We implement this method, but further research is needed to improve convergence of the method.


• 制御系設計のための高効率な数値的アルゴリズムの開発と応用に関する研究

  増淵 泉

  日本学術振興会, 科学研究費助成事業, 奨励研究(A), 2000 - 2001

  制御系設計のための高効率な数値的アルゴリズムの開発と応用に関して,前年度に引き続いて理論面をさらに発展させると同時に,制御系設計実験についても研究を行った.数値的アルゴリズムの開発としては,区分的線形リアプノフ関数に基づく計算手法を開発した.リアプノフ関数のクラスとして,従来同様の連続単調減少するものに加え,新たな概念として,不連続性や非単調性を許すより広いクラスの関数を考えた.このようなリアプノフ関数の具体的な計算アルゴリズムを導出するとともに,問題の構造を利用して高速に解を求める方式を与えた.さらに,実際に数値実験を行ってその有効性を確かめた.また,この数値アルゴリズムに基づいて,ハイブリッドシステムの安定解析問題の数値解法や,切替システムの数値計算に基づく制御系設計法を構築した.特に,切替の不確かさを許容するロバストな切替制御則の設計法を構築した.この設計法は線形行列不等式(LMI)に対する凸最適化計算によって高効率に解けることを示した.また,パラメータ依存LMIの数値解法として,多次元パラメータ依存行列不等式の可解性と数値解について,数値実験を含む研究を行った.パラメータの次元と計算量について考察を行った.また,大規模問題を解くため数値計算アルゴリズム自体の検討も行った.以上の理論的な成果を,模型ヘリコプタ実験装置の制御系設計に応用してその有効性を検証した.そのための予備として実験装置の非線形システム同定を行い、制御実験を行った.以上により,当研究の目的を達成した.


• Theory and application of nonlinear system identification, central and its integration based on Wiener model

  FUJII Takao, KANEKO Osamu, MASUBUCHI Izumi

  Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (C), Osaka University, 2000 - 2001

  This study is concerned with the problem of identification and control of a Wiener type nonlinear systems. A new parametric identification algorithm based on the Wiener model is derived by using both subspace method and model parameter optimization. The identification result shows that the Wiener model is superior to a linear model in capturing the dynamics of nonlinear system. An EKF-based controller for proposed Wiener model is designed and implemented subject to the assumption that an identified Wiener model is completely controllable and observable. The numerical example demonstrates the validity of both proposed identification algorithm and control design. Next, we applied the algorithms to the temperature control of rapid thermal process in semiconductor manufactory. The identification experiment was designed with respect to the desired temperature range in The RTP system. The parameter of Wiener, model was then estimated from input-output data Based on obtained wiener model, the controller was designed to achieve the desired temperature response. The control experiment was performed to verify our control design and the results shows that the con roller is capable of steering the dynamic response and thermal uniformity across a wafer over a wide operating envelope. We also improved the control system with respect to the case that the model parameter is varying slowly. A robust observer based on the sliding mode technique was attempted. The other advantage to use sliding mode observers is to avoid online calculation of Riccati equation, which- saves the calculation cost in the control system. The development of the algorithm for fault detection has been studied at the same pace with system identification and control design. An online identification algorithm based on the wiener model was developed for capturing the model parameter variance. Then by using singular value decomposition technique, we obtain the slow variation of model inner character. A standard for system fault has been established for robust control system.


• Computer Aided Design of Robust Control Systems Computational Geometry Approach

  OHTA Yuzo, MASUBUCHI Izumi

  Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (C), KOBE UNIVERSITY, 1999 - 2000

  The main results obtained through the research are summarized as follows. 1. Development of CAD system for robust controllers design of linear systems. We developed a CAD system for robust controllers design of linear systems using value sets. For systems which has completely decomposable transfer functions and/or characteristic equations, the method using polygon interval arithmetic is very useful to compute value sets. We proposed and implemented a method computing value sets of multi-polynomial functions, which need not be completely decomposable. 2. Generation of piecewise linear Lyapunov functions. We proposed a new class of piecewise linear Lyapunov functions (PWLLFs) and derived stability results. A candidate of PWLLF has parameters corresponding to hyperplanes intersecting stability region. The set of stability conditions are formulated as Linear Programming Problem (LP) in terms of parameters inserted by the hyperplanes. If the computed optimal value is negative, we construct a PWLLF using the solution. When the optimal value of the LP is nonnegative, we modify the PWLLF candidate by adding appropriate hyperplanes to introduce more freedom in the LP formulation and arrive at the desired result. The optimal value of the resulting new LP is always less than or equal to that of the old LP.We also proposed a scheme to generate hyperplanes such that the optimal value of the new LPs is less than that of the old LP.Moreover, a fast method to compute the optimal solutoion of the new LP. 3. Data structure for Euclidean cell complex. We proposed and implemented data structure for Euclidean cell complex. We used this data structure in programs for generation of PWLLFs and will be used for controller design using PWLLFs.


• 物理システムに対する多目的ロバスト制御系設計に関する研究

  増淵 泉

  日本学術振興会, 科学研究費助成事業, 奨励研究(A), 神戸大学, 1998 - 1999

  本研究の目的は,研究代表者が従来より研究してきた多目的ロバスト制御系設計理論を,実システムを対象とした制御系設計に適用するための実際的な方法論を理論的・実験的アプローチにより構築することである.この目的のために,理論面では,多目的ロバスト制御系設計において,制御対象の物理システムとしての構造を反映した補償器の設計法を導出した.その成果を,「スプライン型パラメータ依存二次形式を用いたゲインスケジューリング制御系の設計」,「ゲインスケジューリング制御系の設計におけるディスクリプタ形式の利用について」,「フィードフォワード項を持つロバスト安定サーボ系の設計について」として発表した.さらに,設計法を凸最適化に基づく数値計算による設計CADとして計算機に実装した.この成果を「On Numerical Solution to Parameter-dependent Convex Differential Inequalities」「切替が生じるシステムに対する動的補償器の設計について」として発表した.また,模型ヘリコプタの自動制御を行う制御系の設計を行った.模型ヘリコプタにセンサを組み込み,計算機および制御ボードと結んで制御系を構成した.制御対象のモデリングを,本研究で提唱している設計法に適合する形で行った.模型ヘリコプタを半固定としてテスト入力を加えて設計用モデルの同定および不確かさの大きさの見積もりを行った.センサ信号から制御入力を計算する制御則を,本研究の設計法を実装した CAD を用いて設計した.この制御則を実験装置に実装して実験システムを駆動し,良好な制御結果を得た.この成果を「模型ヘリコプタのモデリングと制御-ゲインスケジューリングを用いたコントローラの設計-」として発表した.


• Computer Aided Design of Robust Control Systems Using Polygon Interval Arithmetic

  OHTA Yuzo, MASUBUCHI Izumi, FUJISAKI Yasumasa

  Japan Society for the Promotion of Science, Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (C), KOBE UNIVERSITY, 1997 - 1998

  The main results obtained through the research are summarized as follows. 1. Value sets estimate for functions which have no totally decomposable expression. We consider a problem to compute good estimate of value sets when a given analytic function f(p) has no totally decomposable expression, where each parameter p1 of p belongs to a polygon, and showed that the boundary of the value set of f is included by the image of edges of polygons. Using this result, we proposed two methods to compute estimates of value sets. One is for the functions which are given by the ratio of affine functions of p. The other is for the functions which are multi-affine functions of p. 2. Development of CAD system for robust control systems. We developed a CAD system which design PID controllers, lead compensators, lag compensators and 2 degree of freedom PID controllers, which satisfy several robust performances. This system compute value sets of plants using NPIA and feasible regions of parameters of controllers using operations on sets (union, intersection and difference set). Since it computes feasible regions, it gives global optimum solution even if optimization problems are not convex. 3. Stability analysis of nonlinear systems. We analyze stability of Lur'e systems which have uncertainties in not only for the nonlinear part but also the linear part. Value sets of transfer function corresponding to the linear part are computed using NPIA and stability is analyzed applying Popov criterion.


• ハイブリッドダイミカルシステムの解析と制御

  1998

  Competitive research funding


• Analysis and synthesis of hybrid dynamical systems

  1998

  Competitive research funding


• 数値計算を用いた多目的ロバスト制御系設計

  1992

  Competitive research funding


• Multiobjective robust control system design using numerical computation

  1992

  Competitive research funding