Journal Articles
  1. Makoto Yamashita, Naoki Hayashi, and Shigemasa Takai,
    ``Dynamic Regret Analysis for Event-Triggered Distributed Online Optimization Algorithm,"
    IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences, (accepted for publication).
  2. Yuichi Kajiyama, Naoki Hayashi, and Shigemasa Takai,
    ``Linear Convergence of Consensus-Based Quantized Optimization for Smooth and Strongly Convex Cost Functions,"
    IEEE Transactions on Automatic Control,
    (accepted for publication).
  3. Naoki Hayashi, Yuichi Kajiyama, and Shigemasa Takai,
    ``Consensus-Based Quantized Algorithm for Convex Optimization with Smooth Cost Functions,"
    IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences, vol. E103-A, no. 2, pp. 435-442, February, 2020.
  4. Naoki Hayashi, Kazuyuki Ishikawa, and Shigemasa Takai,
    ``Distributed Subgradient Method for Constrained Convex Optimization with Quantized and Event-Triggered Communication,"
    IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences, vol. E103-A, no. 2, pp. 428-434, February, 2020.
  5. Naoki Hayashi, Tomohiro Sugiura, Yuichi Kajiyama, and Shigemasa Takai,
    ``Distributed Event-Triggered Algorithm for Unconstrained Convex Optimization over Weight-Balanced Directed Networks,"
    IET Control Theory & Applications, vol. 14, no. 2, pp. 253--261, February, 2020.
  6. Yuichi Kajiyama, Naoki Hayashi, and Shigemasa Takai,
    ``Distributed Constrained Convex Optimization with Accumulated Subgradient Information over Undirected Switching Networks,"
    IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences,
    vol. E102-A, no. 2, pp. 343--350, February, 2019.
  7. Naoki Hayashi and Masaaki Nagahara,
    ``Distributed Proximal Minimization Algorithm for Constrained Convex Optimization over Strongly Connected Networks,"
    IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences,
    vol. E102-A, no. 2, pp. 351--358, February, 2019.
  8. Yuichi Kajiyama, Naoki Hayashi, and Shigemasa Takai,
    ``Distributed Subgradient Method with Edge-Based Event-Triggered Communication,"
    IEEE Transactions on Automatic Control,
    vol. 63, no. 7, pp. 2248--2255, July, 2018.
  9. Kazuyuki Ishikawa, Naoki Hayashi, and Shigemasa Takai,
    ``Consensus-Based Distributed Particle Swarm Optimization with Event-Triggered Communication,"
    IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences,
    vol. E101-A, no. 2, pp. 338--344, February, 2018.
  10. Naoki Hayashi, Kohei Segawa, and Shigemasa Takai,
    ``2D Voronoi Coverage Control with Gaussian Density Functions by Line Integration,"
    SICE Journal of Control, Measurement, and System Integration,
    vol. 10, no. 2, pp. 110--116, March, 2017.
  11. Naoki Hayashi and Shigemasa Takai,
    ``Distributed Source Identification by Two-Hop Consensus Dynamics with Uniform Time-Varying Communication Time-Delays,"
    SICE Journal of Control, Measurement, and System Integration,
    vol. 10, no. 2, pp. 70--76, March, 2017.
  12. Naoki Hayashi, Masaaki Nagahara, and Yutaka Yamamoto,
    ``Robust AC Voltage Regulation of Microgrids in Islanded Mode with Sinusoidal Internal Model,"
    SICE Journal of Control, Measurement, and System Integration,
    vol. 10, no. 2, pp. 62--69, March, 2017.
  13. Shiori Miyake, Naoki Hayashi, and Shigemasa Takai,
    ``Discrete-Time Average Consensus with Multi-Hop Communication,"
    SICE Journal of Control, Measurement, and System Integration,
    vol. 9, no. 5, pp. 187-191, September, 2016.
  14. Shinji Iwase, Naoki Hayashi, and Shigemasa Takai,
    ``A Gradient-Based Approach for Discrete-Time Average Consensus with Self-Triggered Control,"
    SICE Journal of Control, Measurement, and System Integration,
    vol. 9, no. 3, pp. 122-127, May, 2016.
  15. Naoki Hayashi and Shigemasa Takai,
    ``GTS-based Communication Task Scheduling for Quantized Output Consensus over IEEE 802.15.4 Wireless Networks,"
    Automatica, vol. 55, pp. 6-11, May, 2015.
  16. Kenta Hamada, Naoki Hayashi, and Shigemasa Takai,
    ``Event-Triggered and Self-Triggered Control for Discrete-Time Average Consensus Problems,"
    SICE Journal of Control, Measurement, and System Integration,
    vol. 7, no. 5, pp. 297-303, September, 2014.
  17. Naoki Hayashi, Toshimitsu Ushio, and Takafumi Kanazawa,
    ``Potential Game Theoretic Approach to Power-aware Mobile Sensor Coverage Problem,"
    IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences,
    vol. E94-A, no. 3, pp. 929-936, March, 2011.
  18. Naoki Hayashi, Toshimitsu Ushio, and Takafumi Kanazawa,
    ``Adaptive Arbitration of Fair QoS Based Resource Allocation in Multi-Tier Computing Systems,"
    IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences,
    vol. E93-A, no. 9, pp. 1678-1683, September, 2010.
  19. Naoki Hayashi and Toshimitsu Ushio,
    ``Performance Consensus Problem of Multi-agent Systems with Multiple State Variables,"
    IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences,
    vol. E91-A, no. 9, pp. 2403-2410, September, 2008.
  20. Naoki Hayashi, Toshimitsu Ushio, Fumiko Harada, and Atsuko Ohno,
    ``Consensus Problem of Multi-agent Systems with Non-linear Performance Functions,"
    IEICE Transactions on Fundamentals of Electronics, Communications and Computer Sciences,
    vol. E90-A, no. 10, pp. 2261-2264, October, 2007.

Conference Proceedings
  1. Yoshifumi Kusunoki, Naoki Hayashi, Takeshi Hatanaka, and Keiji Tatsumi,
    ``Refinement of Convergence Analysis for Consensus Optimization Algorithm with Adaptive Stepsize Rule,"
    Proceedings of the SICE Annual Conference (SICE2019),
    pp. 1293--1296, Hiroshima, Japan, September, 2019.
  2. Naoki Hayashi, Tomohiro Sugiura, Yuichi Kajiyama, and Shigemasa Takai,
    ``Event-Triggered Consensus-Based Optimization Algorithm for Smooth and Strongly Convex Cost Functions,"
    Proceedings of the 57th IEEE Conference on Decision and Control (CDC2018),
    pp. 2120--2125, Miami, USA, December, 2018.
  3. Kenta Suzuki, Naoki Hayashi, and Shigemasa Takai,
    ``Uniform Ultimate Stability for Time-Varying Nonlinear Systems with Event-Triggered Control,"
    Proceedings of the 2018 IEEE International Conference on Systems, Man, and Cybernetics (SMC2018),
    pp. 2003--2008, Miyazaki, Japan, October, 2018.
  4. Makoto Yamashita, Naoki Hayashi, and Shigemasa Takai,
    ``Regret Analysis of Distributed Online Subgradient Method with Event-Triggered Communication,"
    Proceedings of the SICE Annual Conference (SICE2018),
    pp. 1296--1300, Nara, Japan, September, 2018.
  5. Naoki Hayashi and Masaaki Nagahara,
    ``Consensus-Based Distributed Event-Triggered Sparse Modeling,"
    Proceedings of the SICE Annual Conference (SICE2018),
    pp. 1801--1805, Nara, Japan, September, 2018.
  6. Tatsuya Ito, Kohei Segawa, Naoki Hayashi, and Shigemasa Takai,
    ``Cooperative Voronoi Tracking by Multiple Quadrotors with Onborad PTZ Cameras,"
    Proceedings of the SICE Annual Conference (SICE2018),
    pp. 331--335, Nara, Japan, September, 2018.
  7. Yuichi Kajiyama, Naoki Hayashi, and Shigemasa Takai,
    ``Distributed Multi-Step Subgradient Algorithm for Constrained Convex Optimization with Undirected Time-Varying Communications,"
    Proceedings of the 56th IEEE Conference on Decision and Control (CDC2017),
    pp. 4650--4655, Melbourne, Australia, December, 2017.
  8. Naoki Hayashi and Masaaki Nagahara,
    ``Distributed Proximal Gradient Algorithms for Sparse Modeling over Networks,"
    Proceedings of the 2nd International Symposium on Swarm Behavior and Bio-Inspired Robotics (SWARM2017),
    pp. 305-306, Kyoto, Japan, October, 2017.
  9. Hayato Fujimura, Naoki Hayashi, and Shigemasa Takai,
    ``Linear Convergence of Distributed Periodically-Triggered ADMM for Unconstrained Optimization,"
    Proceedings of the SICE Annual Conference 2016 (SICE2016),
    Tsukuba, Japan, September, 2016 (accepted).
  10. Kohei Segawa, Kenta Hamada, Naoki Hayashi, and Shigemasa Takai,
    ``Cooperative Target Tracking by 2-level Hierarchical PTZ Camera Sensor Networks,"
    Proceedings of the 54th IEEE Conference on Decision and Control (CDC2015),
    pp. 2975-2980, Osaka, Japan, December, 2015.
  11. Koki Abe, Naoki Hayashi, and Shigemasa Takai,
    ``Cooperative Voronoi Coverage with Velocity Feedback of Centroids,"
    Proceedings of the 1st International Symposium on Swarm Behavior and Bio-Inspired Robotics (SWARM2015),
    pp. 372-374, Kyoto, Japan, October, 2015.
  12. Naoki Hayashi, Yu Muranishi, and Shigemasa Takai,
    ``Distributed Event-triggered Control for Voronoi Coverage,"
    Proceedings of the 1st IEEE International Conference on Event-Based Control, Communication, and Signal Processing (EBCCSP2015 Work-in-Progress Session),
    Krakow, Poland, June, 2015.
  13. Yu Muranishi, Naoki Hayashi, and Shigemasa Takai,
    ``Distributed Estimation of 1-D Convection-Diffusion Phenomena by Discrete-Time Event-Triggered Consensus Dynamics,"
    Proceedings of the 53rd IEEE Conference on Decision and Control (CDC2014),
    pp. 1995-2000, Los Angeles, USA, December, 2014.
  14. Kenji Nomura, Naoki Hayashi, and Shigemasa Takai,
    ``Distributed Event-Triggered Control for Consensus Problems with Non-linear Output Functions,"
    Proceedings of the ISCIE/ASME 2014 International Symposium on Flexible Automation (ISFA2014),
    ISFA2014-99S, Hyogo, Japan, July, 2014.
  15. Naoki Hayashi and Shigemasa Takai,
    ``Consensus-based Distribution Estimation of 1-D Diffusion Phenomena,"
    Proceedings of the 2014 American Control Conference (ACC2014),
    pp. 2569-2574, Portland, USA, June, 2014.
  16. Naoki Hayashi and Shigemasa Takai,
    ``A GTS Scheduling for Consensus Problems Over IEEE 802.15.4 Wireless Networks,"
    Proceedings of the 12th European Control Conference (ECC2013),
    pp. 1764-1769, Zurich, Switzerland, July, 2013.
  17. Masaaki Nagahara, Yutaka Yamamoto, Seiya Miyazaki, Takahiro Kudoh, and Naoki Hayashi,
    ``H-infinity Control of Microgrids Involving Gas Turbine Engines and Batteries,"
    Proceedings of the 51st IEEE Conference on Decision and Control (CDC2012),
    pp. 4241-4246, Maui, USA, December, 2012.
  18. Saori Teraoka, Toshimitsu Ushio, Takafumi Kanazawa, and Naoki Hayashi,
    ``Potential Games Based Coverage Control with Voronoi Partition,"
    Proceedings of the 2010 International Symposium on Nonlinear Theory and its Applications (NOLTA2010),
    pp. 229-232, Krakow, Poland, September, 2010.
  19. Naoki Hayashi, Toshimitsu Ushio and Takafumi Kanazawa,
    ``Application of Potential Games to Power-aware Mobile Sensor Coverage Control,"
    RTAS2010 Work-in-Progress Session (16th IEEE Real-Time and Embedded Technology and Applications Symposium), pp. 13-16, Stockholm, Sweden, April, 2010.
  20. Naoki Hayashi, Toshimitsu Ushio and Takafumi Kanazawa,
    ``Adaptive Fair Resource Management with an Arbiter for Multi-tier Computing Systems,"
    14th IEEE International Conference on Emerging Technologies and Factory Automation (ETFA2009),
    Reference Number: 000701, Palma de Mallorca, Spain, September, 2009.
  21. Naoki Hayashi, Toshimitsu Ushio and Takafumi Kanazawa,
    ``Poster Abstract: Arbitration of Adaptive Resource Allocation for Fair QoS Control in Multi-tier Computing Systems,"
    RTAS2009 Poster Session (15th IEEE Real-Time and Embedded Technology and Applications Symposium), San Francisco, USA, April, 2009.
  22. Naoki Hayashi and Toshimitsu Ushio,
    ``Application of A Consensus Problem to Fair Multi-resource Allocation in Real-time Systems,"
    Proceedings of the 47th IEEE Conference on Decision and Control (CDC2008),
    pp. 2450-2455, Cancun, Mexico, December, 2008.
  23. Naoki Hayashi and Toshimitsu Ushio,
    ``Performance Consensus Problem of Multi-agent Systems with Multiple State Variables,"
    2007 International Symposium on Nonlinear Theory and its Applications (NOLTA2007),
    pp. 409-412, Vancouver, Canada, September, 2007.
  24. Naoki Hayashi, Toshimitsu Ushio, Fumiko Harada and Atsuko Ohno,
    ``Consensus Problem of Multi-agent Systems with Non-linear Performance Functions,"
    Work-in-Progress Session in the 2006 International Symposium on Nonlinear Theory and its Applications (NOLTA2006),
    pp. 979-982, Bologna, Italy, September, 2006.

Others
  1. Naoki Hayashi, Toshimitsu Ushio, and Takafumi Kanazawa,
    ``Distributed Control for Power-aware Mobile Sensor Coverage Problem using Potential Games,"
    Georgia Tech Summer School on Cyber-Physical Systems, June, 2010.

Research Promotion
  1. April 2013 - March 2017
    Grant-in-Aid for Young Scientists (B)
  2. Octorber 2012
    Mitutoyo Association for Science and Technology
  3. April 2009 - March 2011
    Grant-in-Aid for JSPS Fellows

Awards
  1. The 72nd Young Researcher's Award,
    The Institute of Electronics, Information and Communication Engineers (IEICE), March, 2010.
  2. The 24th Telecom System Technology Award for Students,
    The Telecommunications Advancement Foundation (TAF), March, 2009.