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Various Approaches to Computationally Hard Combinatorial Optimization Problems

Research Project

Project/Area Number 18K11183
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 60020:Mathematical informatics-related
Research InstitutionTokyo Denki University

Principal Investigator

Chen Zhi-Zhong  東京電機大学, 理工学部, 教授 (00242933)

Project Period (FY) 2018-04-01 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥3,250,000 (Direct Cost: ¥2,500,000、Indirect Cost: ¥750,000)
Fiscal Year 2022: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2021: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2020: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2019: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2018: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Keywords組合せ最適化問題 / 近似アルゴリズム / randomizedアルゴリズム / 固定パラメータアルゴリズム / オンラインアルゴリズム / 発見的手法 / NP困難性 / スケジューリング / テスト付きスケジューリング / 競合比 / 最大三角形パッキング / 乱択アルゴリズム / ならし解析 / 脱ランダム化 / k-パス分割問題 / 最大2-マッチング問題 / 生物系統樹のrSPR距離計算問題 / 生物系統樹の交差数計算問題 / 生物系統樹の葉除去距離計算問題 / グラフの最大三角形パッキング問題 / 確率近似アルゴリズム / 生物系統樹 / 整数線形計画 / 組合せ最適化 / バイオインフォマティクス
Outline of Final Research Achievements

We designed, analyzed, and implemented efficient algorithms for computationally hard combinatorial optimization problems. The concrete targeted problems include the following: the rSPR distance problem of rooted binary phylogenetic trees, the maximally balanced connected graph tripartition problem, the minimum leaf-removal center problem of rooted binary phylogenetic trees, the metric maximum triangle packing problem, the k-path partition problem of directed graphs, the minimum total completion-time problem of job scheduling with testing, and so on. For each of the problems, we succeeded in designing new algorithms that outperform the previous bests. For most of our designed problems, we not only rigorously analyzed their theoretical performance, but also implemented them into computer programs and compared their performance against the previous bests with both practical datasets and simulated ones.

Academic Significance and Societal Importance of the Research Achievements

対象とした組合せ最適化問題(「生物系統樹のrSPR距離問題」、「生物系統樹の最少葉数除去問題」、「メトリック最大三角形パッキン問題」、「グラフのkパス分割問題」、「テスト付きスケジューリングの最小合計処理時間問題」、など)それぞれについて、以前知られていた最良なアルゴリズムよりよい性能を達成する新しいアルゴリズムを設計できたので、当該分野の発展に貢献できたと言える。特に、一部の問題は実世界において重要な応用を持っているので、本研究で設計したアルゴリズムを実装して得たプログラムは実世界の現場で使われて社会に貢献する可能性を秘めている。

Report

(6 results)
  • 2022 Annual Research Report   Final Research Report ( PDF )
  • 2021 Research-status Report
  • 2020 Research-status Report
  • 2019 Research-status Report
  • 2018 Research-status Report
  • Research Products

    (19 results)

All 2022 2021 2020 2019 2018 Other

All Int'l Joint Research (4 results) Journal Article (8 results) (of which Int'l Joint Research: 8 results,  Peer Reviewed: 8 results) Presentation (6 results) (of which Int'l Joint Research: 6 results) Remarks (1 results)

  • [Int'l Joint Research] University of Alberta(カナダ)

    • Related Report
      2022 Annual Research Report
  • [Int'l Joint Research] City University of Hong Kong/Hangzhou Dianzi University(中国)

    • Related Report
      2022 Annual Research Report
  • [Int'l Joint Research] University of Alberta(カナダ)

    • Related Report
      2021 Research-status Report
  • [Int'l Joint Research] Hangzhou Dianzi University(中国)

    • Related Report
      2021 Research-status Report
  • [Journal Article] Identifying Duplications and Lateral Gene Transfers Simultaneously and Rapidly2022

    • Author(s)
      Zhi-Zhong Chen, F. Deng, and L. Wang
    • Journal Title

      Journal of Bioinformatics and Computational Biology

      Volume: 20 Issue: 01 Pages: 2150033-2150033

    • DOI

      10.1142/s0219720021500335

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Approximation Algorithms for the Maximally Balanced Connected Graph Tripartition Problem2022

    • Author(s)
      G. Chen, Y. Chen, Zhi-Zhong Chen, G. Lin, T. Liu, and A. Zhang
    • Journal Title

      Journal of Combinatorial Optimization

      Volume: 44 Issue: 3 Pages: 1753-1773

    • DOI

      10.1007/s10878-020-00544-w

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Approximation Algorithms for Maximally Balanced Connected Graph Partition2021

    • Author(s)
      Y. Chen, Zhi-Zhong Chen, G. Lin, Y. Xu, and A. Zhang.
    • Journal Title

      Algorithmica

      Volume: 83 Issue: 12 Pages: 3715-3740

    • DOI

      10.1007/s00453-021-00870-3

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] A randomized approximation algorithm for metric triangle packing2021

    • Author(s)
      Y. Chen, Zhi-Zhong Chen, G. Lin, L. Wang, and A. Zhang.
    • Journal Title

      Journal of Combinatorial Optimization

      Volume: 41 Issue: 1 Pages: 12-27

    • DOI

      10.1007/s10878-020-00660-7

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Improved Approximation Algorithms for Path Vertex Covers in Regular Graphs2020

    • Author(s)
      A. Zhang, Y. Chen, Zhi-Zhong Chen, and G. Lin
    • Journal Title

      Algorithmica

      Volume: 82 Issue: 10 Pages: 3041-3064

    • DOI

      10.1007/s00453-020-00717-3

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Faster Exact Computation of rSPR Distance via Better Approximation2020

    • Author(s)
      Zhi-Zhong Chen, Y. Harada, Y. Nakamura, and Lusheng Wang
    • Journal Title

      IEEE ACM Trans. Comput. Biol. Bioinform.

      Volume: 17 Issue: 3 Pages: 916-929

    • DOI

      10.1109/tcbb.2018.2878731

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Designing and Implementing Algorithms for the Closest String Problem2019

    • Author(s)
      陳致中
    • Journal Title

      Theoretical Computer Science

      Volume: 786 Pages: 32-43

    • DOI

      10.1016/j.tcs.2018.05.017

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Approximation Algorithms for the Maximum Weight Internal Spanning Tree Problem2019

    • Author(s)
      陳致中
    • Journal Title

      Algorithmica

      Volume: 81 Issue: 11-12 Pages: 4167-4199

    • DOI

      10.1007/s00453-018-00533-w

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Presentation] Approximation Algorithms for the Directed Path Partition Problems2021

    • Author(s)
      Y. Chen, Zhi-Zhong Chen, C. Kennedy, G. Lin, Y. Xu, and A. Zhang.
    • Organizer
      International Joint Conference on Frontiers of Algorithmics
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research
  • [Presentation] Better Practical Algorithms for rSPR Distance and Hybridization Number2019

    • Author(s)
      K. Yamada, Zhi-Zhong Chen, and L. Wang.
    • Organizer
      The 19th Workshop on Algorithms in Bioinformatics
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] Computing a Consensus Phylogeny via Leaf Removal2019

    • Author(s)
      Zhi-Zhong Chen, S. Ueta, J. Li, and Lusheng Wang.
    • Organizer
      The 15th International Symposium on Bioinformatics Research and Applications
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] A Randomized Approximation Algorithm for Metric Triangle Packing2019

    • Author(s)
      Y. Chen, Zhi-Zhong Chen, G. Lin, L. Wang, and A. Zhang.
    • Organizer
      The 13th Annual International Conference on Combinatorial Optimization and Applications
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] Approximation Algorithms for Maximally Balanced Connected Graph Partition2019

    • Author(s)
      Y. Chen, Zhi-Zhong Chen, G. Lin, Y. Xu, and A. Zhang.
    • Organizer
      The 13th Annual International Conference on Combinatorial Optimization and Applications
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] Finding a Center Tree of Phylogenetic Trees via Leaf Removal2018

    • Author(s)
      Zhi-Zhong Chen
    • Organizer
      2018 IEEE International Conference on Bioinformatics and Biomedicine
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Remarks] Constructing a Center Tree via Leaf Removal

    • URL

      http://rnc.r.dendai.ac.jp/centerTree.html

    • Related Report
      2018 Research-status Report

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Published: 2018-04-23   Modified: 2024-01-30  

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