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The Ridesharing Problem of Graphs and Its Applications

Research Project

Project/Area Number 19K11813
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 60010:Theory of informatics-related
Research InstitutionTohoku University

Principal Investigator

Zhou Xiao  東北大学, 情報科学研究科, 教授 (10272022)

Project Period (FY) 2019-04-01 – 2022-03-31
Project Status Completed (Fiscal Year 2021)
Budget Amount *help
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2021: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2020: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2019: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Keywordsグラフ / 木 / 木幅 / アルゴリズム / FTPアルゴリズム / 計算量理論 / NP困難 / FPTアルゴリズム
Outline of Research at the Start

本研究ではグラフのライドシェアリング問題を解く効率のよいアルゴリズムの設計論を構築するとともに緊急支援物資輸送などへの応用可能な経路策定方法論を研究目的とする。ライドシェアリング問題を含む実社会で生じる問題のほとんどは一般グラフにおいて理論的にNP困難であることが示されている。グラフ構造がある程度制限した場合には多くのNP困難な計算問題が多項式時間計算可能であることが予想されている。本研究では、応用上よく現れるグラフのクラスに限定し、ライドシェアリング問題を解くアルゴリズムの設計論を構築し、大規模災害発生時に刻々変化する道路網に対応可能なよりよい緊急支援物資輸送経路を策定することが目的である。

Outline of Final Research Achievements

The purpose of this research is to construct an efficient algorithm design theory for solving the ride-sharing problem of graphs, and to study a route formulation methodology that can be applied to the transportation of emergency relief supplies in the event of a large-scale disaster. The results of the research include the theoretical development of graphs, especially those of trees and graphs with small tree widths, and the efficiency of algorithms.
I think that the algorithm developed in this research can be applied to many combination problems in trees and cographs, etc., and can contribute to the development of efficient algorithms, polynomial time algorithms, and FPT algorithms. We have published 5 academic papers summarizing the results obtained in this research, which can be highly evaluated.

Academic Significance and Societal Importance of the Research Achievements

学術的貢献として、グラフ特に木や直並列グラフや木幅が小さいグラフに関する理論的な展開とアルゴリズムの効率化があげられる。特に木に対しては、グラフの分割と巧みな動的計画法を導入して、FPTアルゴリズムを開発することにも成功した。特に本研究で開発したアルゴリズムは、木やコグラフにおける数多くの組合せ問題に適用可能と思い、効率よいアルゴリズム、FPTアルゴリズムの開発に役に立つと思っている。本研究で得られた成果をまとめた5編の学術論文が発表されている。これらのアルゴリズムの開発で導入された手法は多くの組合せ問題に応用可能であり、理論計算機科学分野の重要な成果である。

Report

(4 results)
  • 2021 Annual Research Report   Final Research Report ( PDF )
  • 2020 Research-status Report
  • 2019 Research-status Report
  • Research Products

    (15 results)

All 2021 2020 2019

All Journal Article (7 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 7 results,  Open Access: 3 results) Presentation (8 results) (of which Int'l Joint Research: 3 results)

  • [Journal Article] Decremental optimization of vertex-coloring under the reconfiguration framework2021

    • Author(s)
      Yusuke Yanagisawa, Yuma Tamura, Akira Suzuki and Xiao Zhou
    • Journal Title

      Proceedings of the 27th International Computing and Combinatorics Conference (COCOON 2021), Lecture Notes in Computer Science (LNCS)

      Volume: 13025 Pages: 355-366

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Approximability of the independent feedback vertex set problem for bipartite graphs2021

    • Author(s)
      Yuma Tamura, Takehiro Ito and Xiao Zhou
    • Journal Title

      Theoretical Computer Science

      Volume: 849 Pages: 227-236

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Approximability of the Independent Feedback Vertex Set Problem for Bipartite Graphs2021

    • Author(s)
      Yuma Tamura, Takehiro Ito and Xiao Zhou
    • Journal Title

      Theoretical Computer Science

      Volume: 849 Pages: 227-236

    • DOI

      10.1016/j.tcs.2020.10.026

    • Related Report
      2020 Research-status Report
    • Peer Reviewed
  • [Journal Article] Minimization and Parameterized Variants of Vertex Partition Problems on Graphs2020

    • Author(s)
      Yuma Tamura, Takehiro Ito and Xiao Zhou
    • Journal Title

      Proceedings of the 31st International Symposium on Algorithms and Computation (ISAAC2020), Leibniz International Proceedings in Informatics (LIPIcs)

      Volume: 181

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Approximability of the Independent Feedback Vertex Set Problem for Bipartite Graphs2020

    • Author(s)
      Yuma Tamura, Takehiro Ito and Xiao Zhou
    • Journal Title

      Lecture Notes in Computer Science

      Volume: 12049 Pages: 286-295

    • DOI

      10.1007/978-3-030-39881-1_28

    • ISBN
      9783030398804, 9783030398811
    • Related Report
      2019 Research-status Report
    • Peer Reviewed
  • [Journal Article] The Coloring Reconfiguration Problem on Specific Graph Classes2019

    • Author(s)
      HATANAKA Tatsuhiko、ITO Takehiro、ZHOU Xiao
    • Journal Title

      IEICE Transactions on Information and Systems

      Volume: E102.D Issue: 3 Pages: 423-429

    • DOI

      10.1587/transinf.2018FCP0005

    • NAID

      130007606879

    • ISSN
      0916-8532, 1745-1361
    • Year and Date
      2019-03-01
    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Reconfiguration of Minimum Steiner Trees via Vertex Exchanges2019

    • Author(s)
      Haruka Mizuta, Tatsuhiko Hatanaka, Takehiro Ito and Xiao Zhou
    • Journal Title

      Leibniz International Proceedings in Informatics

      Volume: 138

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] Decremental optimization of vertex-coloring under the reconfiguration framework2021

    • Author(s)
      Yusuke Yanagisawa, Yuma Tamura, Akira Suzuki and Xiao Zhou
    • Organizer
      The 27th International Computing and Combinatorics Conference (COCOON 2021)
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Optimization variant of vertex-coloring reconfiguration problem,2021

    • Author(s)
      Yusuke Yanagisawa, Akira Suzuki, Yuma Tamura and Xiao Zhou
    • Organizer
      情報処理学会 第185回アルゴリズム研究会
    • Related Report
      2021 Annual Research Report
  • [Presentation] 区間グラフに対するハミルトン閉路遷移問題2021

    • Author(s)
      佐藤 颯介,鈴木 顕,伊藤 健洋,周 暁
    • Organizer
      電子情報通信学会 2021年 総合大会 COMP 学生シンポジウム
    • Related Report
      2021 Annual Research Report
  • [Presentation] Minimizing a Vertex Set Satisfying Specific Graph Properties2020

    • Author(s)
      Yuma Tamura, Takehiro Ito and Xiao Zhou
    • Organizer
      情報処理学会 第180回アルゴリズム研究会
    • Related Report
      2020 Research-status Report
  • [Presentation] Approximation of the Independent Feedback Vertex Set Problem2020

    • Author(s)
      Yuma Tamura, Takehiro Ito and Xiao Zhou
    • Organizer
      情報処理学会 第177回アルゴリズム研究会
    • Related Report
      2020 Research-status Report
  • [Presentation] Approximability of the Independent Feedback Vertex Set Problem for Bipartite Graphs2020

    • Author(s)
      Yuma Tamura, Takehiro Ito and Xiao Zhou
    • Organizer
      the 14th International Conference and Workshop on Algorithms and Computation (WALCOM2020)
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research
  • [Presentation] Approximability of the Independent Feedback Vertex Set Problem for Bipartite Graphs2020

    • Author(s)
      Yuma Tamura, Takehiro Ito and Xiao Zhou
    • Organizer
      Proceedings of the 14th International Conference and Workshop on Algorithms and Computation (WALCOM 2020),
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] Reconfiguration of Minimum Steiner Trees via Vertex Exchanges2019

    • Author(s)
      Haruka Mizuta, Tatsuhiko Hatanaka, Takehiro Ito and Xiao Zhou
    • Organizer
      Proceedings of the 44th International Symposium on Mathematical Foundations of Computer Science (MFCS 2019)
    • Related Report
      2019 Research-status Report

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Published: 2019-04-18   Modified: 2023-01-30  

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