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2019 Fiscal Year Annual Research Report

「ゆらぎ」を用いて外乱に高速に適応する動的ネットワークに関する研究

Research Project

Project/Area Number 18K18000
Research InstitutionOsaka University

Principal Investigator

首藤 裕一  大阪大学, 情報科学研究科, 助教 (50643665)

Project Period (FY) 2018-04-01 – 2021-03-31
Keywords動的ネットワーク / リーダ選挙 / 分散コンピューティング / 頑健性 / 自己安定アルゴリズム / 自律復旧 / ゆらぎ
Outline of Annual Research Achievements

本研究は,個々の計算資源は乏しいが膨大な数の移動ノードで構成される動的ネットワークにおいて,ノードの故障や外部からの攻撃などの外乱によって不安定 な状態に陥ったネットワークを高速に復旧するための基盤技術の確立を目的とする.このような動的ネットワークにおいて外乱が引き起こす異常状態から自律復旧を行う頑健なアルゴリズムは,多くのタスクについて実現不可能であるか,復旧時間が長く外乱発生のたびにシステムが長期間不安定状態に陥ることが多い. 本研究は,外乱からの復旧完了後であってもわずかな確率で再度異常状態に陥る「ゆらぎ」を許容することをアプローチとして,動的ネットワークにおいても高速かつ頑健なアルゴリズム群を実現するための基盤技術を確立することを目指すものである.本研究によって,動的ネットワークの外乱に対する耐性を汎用的に かつ著しく高めることが期待できる.

初年度において,本研究の主題,すなわち動的ネットワークにおいて外乱に対して頑健かつ高速なアルゴリズムを設計可能であるかという問いを当初の目論見通 り肯定的に解決することに成功した.具体的には,近年盛んに研究が行われている個体群モデル(population protocols)と呼ばれる動的ネットワークの計算モ デルにおいて,最も重大かつ基本的な問題のひとつであるリーダ選挙問題を頑健かつ高速に解くアルゴリズムを設計することに成功した.また,同モデルにおいて,頑健性は持たないものの,世界最速のリーダ選挙アルゴリズムを設計することにも成功し,第二年度においてその正当性と最適性を理論的に証明した.ま た,第二年度においては,個体群モデルが厳密な意味での頑健性を持つために必要な知識の必要十分条件を明らかにした.

これらの成果は,先に述べた頑健なリーダ選挙アルゴリズムを理論的限界まで高速化できる可能性を強く示唆しており,さらなる発展研究の余地を見出した.

  • Research Products

    (22 results)

All 2020 2019 Other

All Int'l Joint Research (1 results) Journal Article (8 results) (of which Int'l Joint Research: 2 results,  Peer Reviewed: 8 results,  Open Access: 2 results) Presentation (13 results) (of which Int'l Joint Research: 13 results)

  • [Int'l Joint Research] ネバダ大学ラスベガス校(米国)

    • Country Name
      U.S.A.
    • Counterpart Institution
      ネバダ大学ラスベガス校
  • [Journal Article] Loosely-stabilizing leader election with polylogarithmic convergence time2020

    • Author(s)
      Sudo Yuichi、Ooshita Fukuhito、Kakugawa Hirotsugu、Masuzawa Toshimitsu、Datta Ajoy K.、Larmore Lawrence L.
    • Journal Title

      Theoretical Computer Science

      Volume: 806 Pages: 617~631

    • DOI

      https://doi.org/10.1016/j.tcs.2019.09.034

    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Loosely Stabilizing Leader Election on Arbitrary Graphs in Population Protocols without Identifiers or Random Numbers2020

    • Author(s)
      SUDO Yuichi、OOSHITA Fukuhito、KAKUGAWA Hirotsugu、MASUZAWA Toshimitsu
    • Journal Title

      IEICE Transactions on Information and Systems

      Volume: E103.D Pages: 489~499

    • DOI

      https://doi.org/10.1587/transinf.2019FCP0003

    • Peer Reviewed
  • [Journal Article] Leader Election Requires Logarithmic Time in Population Protocols2020

    • Author(s)
      Sudo Yuichi、Masuzawa Toshimitsu
    • Journal Title

      Parallel Processing Letters

      Volume: 30 Pages: 2050005~2050005

    • DOI

      https://doi.org/10.1142/S012962642050005X

    • Peer Reviewed
  • [Journal Article] Move-optimal partial gathering of mobile agents without identifiers or global knowledge in asynchronous unidirectional rings2020

    • Author(s)
      Shibata Masahiro、Kawata Norikazu、Sudo Yuichi、Ooshita Fukuhito、Kakugawa Hirotsugu、Masuzawa Toshimitsu
    • Journal Title

      Theoretical Computer Science

      Volume: 822 Pages: 92~109

    • DOI

      https://doi.org/10.1016/j.tcs.2020.04.002

    • Peer Reviewed
  • [Journal Article] Time-Optimal Leader Election in Population Protocols2020

    • Author(s)
      Sudo Yuichi、Ooshita Fukuhito、Izumi Taisuke、Kakugawa Hirotsugu、Masuzawa Toshimitsu
    • Journal Title

      IEEE Transactions on Parallel and Distributed Systems

      Volume: 31 Pages: 2620~2632

    • DOI

      10.1109/TPDS.2020.2991771

    • Peer Reviewed / Open Access
  • [Journal Article] Dynamic Ring Exploration with (H,S) View2020

    • Author(s)
      Gotoh Tsuyoshi、Sudo Yuichi、Ooshita Fukuhito、Masuzawa Toshimitsu
    • Journal Title

      Algorithms

      Volume: 13 Pages: 141~141

    • DOI

      https://doi.org/10.3390/a13060141

    • Peer Reviewed / Open Access
  • [Journal Article] Energy Balancing by Wireless Energy Transfer in Sensor Networks2019

    • Author(s)
      Michizu Hiroshi、Sudo Yuichi、Kakugawa Hirotsugu、Masuzawa Toshimitsu
    • Journal Title

      International Journal of Networking and Computing

      Volume: 9 Pages: 239~256

    • DOI

      https://doi.org/10.15803/ijnc.9.2_239

    • Peer Reviewed
  • [Journal Article] Loosely-Stabilizing Leader Election for Arbitrary Graphs in Population Protocol Model2019

    • Author(s)
      Sudo Yuichi、Ooshita Fukuhito、Kakugawa Hirotsugu、Masuzawa Toshimitsu、Datta Ajoy K.、Larmore Lawrence L.
    • Journal Title

      IEEE Transactions on Parallel and Distributed Systems

      Volume: 30 Pages: 1359~1373

    • DOI

      https://doi.org/10.1109/TPDS.2018.2881125

    • Peer Reviewed / Int'l Joint Research
  • [Presentation] Self-Stabilizing Construction of a Minimal Weakly ST-Reachable Directed Acyclic Graph2020

    • Author(s)
      Junya Nakamura, Masahiro Shibata, Yuichi Sudo, and Yonghwan Kim
    • Organizer
      In Proceedings of The 39th International Symposium on Reliable Distributed Systems
    • Int'l Joint Research
  • [Presentation] The Power of Global Knowledge on Self-stabilizing Population Protocols2020

    • Author(s)
      Yuichi Sudo, Masahiro Shibata, Yonghwan Kim, Junya Nakamura, Toshimitsu Masuzawa
    • Organizer
      27th International Colloquium on Structural Information and Communication Complexity
    • Int'l Joint Research
  • [Presentation] Logarithmic Expected-Time Leader Election in Population Protocol Model2019

    • Author(s)
      Yuichi Sudo, Fukuhito Ooshita, Taisuke Izumi, Hirotsugu Kakugawa, and Toshimitsu Masuzawa
    • Organizer
      21st International Symposium on Stabilization, Safety, and Security of Distributed Systems
    • Int'l Joint Research
  • [Presentation] Improved-Zigzag: An improved local-information based self-optimizing routing algorithm in virtual grid networks2019

    • Author(s)
      Yonghwan Kim, Masahiro Shibata, Yuichi Sudo, Junya Nakamura, Yoshiaki Katayama, and Toshimitsu Masuzawa
    • Organizer
      21st International Symposium on Stabilization, Safety, and Security of Distributed Systems
    • Int'l Joint Research
  • [Presentation] A Self-stabilizing 1-maximal Independent Set Algorithm2019

    • Author(s)
      Hideyuki Tanaka, Yuichi Sudo, Hirotsugu Kakugawa, Toshimitsu Masuzawa, and Ajoy K. Datta
    • Organizer
      21st International Symposium on Stabilization, Safety, and Security of Distributed Systems
    • Int'l Joint Research
  • [Presentation] Atomic Cross-Chain Swaps with Improved Space and Local Time Complexity2019

    • Author(s)
      Soichiro Imoto, Yuichi Sudo, Hirotsugu Kakugawa, and Toshimitsu Masuzawa
    • Organizer
      21st International Symposium on Stabilization, Safety, and Security of Distributed Systems
    • Int'l Joint Research
  • [Presentation] Exploration of dynamic ring networks by a single agent with the H-hops and S-time steps view2019

    • Author(s)
      Tsuyoshi Gotoh, Yuichi Sudo, Fukuhito Ooshita, and Toshimitsu Masuzawa
    • Organizer
      21st International Symposium on Stabilization, Safety, and Security of Distributed Systems
    • Int'l Joint Research
  • [Presentation] Brief Announcement: Self-Stabilizing Construction of a Minimal Weakly ST-Reachable Directed Acyclic Graph2019

    • Author(s)
      Junya Nakamura, Masahiro Shibata, Yuichi Sudo, and Yonghwan Kim
    • Organizer
      21st International Symposium on Stabilization, Safety, and Security of Distributed Systems
    • Int'l Joint Research
  • [Presentation] Brief Announcement: Logarithmic Expected-Time Leader Election in Population Protocol Model2019

    • Author(s)
      Yuichi Sudo, Fukuhito Ooshita, Taisuke Izumi, Hirotsugu Kakugawa, and Toshimitsu Masuzawa
    • Organizer
      38th ACM Symposium on Principles of Distributed Computing
    • Int'l Joint Research
  • [Presentation] A Self-Stabilizing Algorithm for Constructing an ST-Reachable Directed Acyclic Graph When |S|<=2 and |T|<=22019

    • Author(s)
      Yonghwan Kim, Masahiro Shibata, Yuichi Sudo, Junya Nakamura, Yoshiaki Katayama and Toshimitsu Masuzawa
    • Organizer
      39th IEEE International Conference on Distributed Computing Systems
    • Int'l Joint Research
  • [Presentation] A Population Protocol Model with Interaction Probability Considering Speeds of Agents2019

    • Author(s)
      Ryoya Sadano, Yuichi Sudo, Fukuhito Ooshita, Hirotsugu Kakugawa, Toshimitsu Masuzawa
    • Organizer
      39th IEEE International Conference on Distributed Computing Systems
    • Int'l Joint Research
  • [Presentation] Partial gathering of mobile agents without identifiers or global knowledge in asynchronous unidirectional rings2019

    • Author(s)
      Masahiro Shibata, Norikazu Kawata, Yuichi Sudo, Fukuhito Ooshita, Hirotsugu Kakugawa, Toshimitsu Masuzawa
    • Organizer
      26th International Colloquium on Structural Information and Communication Complexity
    • Int'l Joint Research
  • [Presentation] Brief Announcement: A strongly-stabilizing protocol for spanning tree construction against a mobile Byzantine fault2019

    • Author(s)
      Koki Inoue, Yuichi Sudo, Hirotsugu Kakugawa, Toshimitsu Masuzawa
    • Organizer
      26th International Colloquium on Structural Information and Communication Complexity
    • Int'l Joint Research

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Published: 2021-01-27  

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