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Study on complex spherical codes and designs

Research Project

Project/Area Number 18K03395
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 12030:Basic mathematics-related
Research Institution防衛大学校(総合教育学群、人文社会科学群、応用科学群、電気情報学群及びシステム工学群) (2019-2022)
Aichi University of Education (2018)

Principal Investigator

Suda Sho  防衛大学校(総合教育学群、人文社会科学群、応用科学群、電気情報学群及びシステム工学群), 総合教育学群, 准教授 (30710206)

Co-Investigator(Kenkyū-buntansha) 谷口 哲至  広島工業大学, 工学部, 准教授 (90543728)
Gavrilyuk Alexander  島根大学, 学術研究院理工学系, 講師 (20897946)
Project Period (FY) 2018-04-01 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2021: ¥650,000 (Direct Cost: ¥500,000、Indirect Cost: ¥150,000)
Fiscal Year 2020: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2019: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2018: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Keywords可換アソシエーション・スキーム / 符号 / デザイン / エルミート隣接行列 / 不定値内積空間 / 半正定値計画法 / アダマール行列 / 有限射影平面 / アソシエーションスキーム / optilmal code / weighing matrix / balanced weighing matrix / 数独 / 直交数独 / 強正則グラフ / Q-多項式コヒアラント配置 / Divisible design digraph / Orthogonla design / Equiangular tight frame / BGW / Hermite adjacency matrix / 不定値ユニタリ群 / directed Deza graph / disjoint weighing matrix / 直交配列 / 等角直線族 / 不変なアダマール行列 / MUB / SIC-POVM
Outline of Final Research Achievements

I conducted research on code and design on the complex sphere. As a significant contribution, I established the framework of semidefinite programming on the complex sphere and developed the theory of codes with indefinite inner products on the complex sphere. These achievements hold the potential for further advancement in code theory on the complex sphere, which was previously based on linear programming. Additionally, the application of code theory on the complex sphere with indefinite inner products, which was not initially anticipated at the start of the research, shows promise in the context of the eigenvalue multiplicities of Hermitian adjacency matrices of directed graphs, suggesting future developments.

Academic Significance and Societal Importance of the Research Achievements

複素球面上の符号・デザインの進展は、代数的組合せ論の重要な研究対象である可換アソシエーション・スキームと密接に関連する研究である。さらに複素MUBやSICPOVM、equiangular tight frameといった対象への応用が見込まれる。さらに不定値内積空間の符号理論の進展は、そのエルミート隣接行列の固有値を介して、有向グラフへの応用が見込まれる。研究成果の学術的意義は高いといえる。

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

    (43 results)

All 2022 2021 2020 2019 2018 Other

All Int'l Joint Research (12 results) Journal Article (12 results) (of which Int'l Joint Research: 11 results,  Peer Reviewed: 12 results,  Open Access: 1 results) Presentation (19 results) (of which Int'l Joint Research: 10 results,  Invited: 13 results)

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

    • Related Report
      2022 Annual Research Report
  • [Int'l Joint Research] National Central University(その他の国・地域(台湾))

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

    • Related Report
      2021 Research-status Report
  • [Int'l Joint Research] National Central University/National Center for Theoretical Sciences(その他の国・地域)

    • Related Report
      2021 Research-status Report
  • [Int'l Joint Research] University of Lethbridge(カナダ)

    • Related Report
      2020 Research-status Report
  • [Int'l Joint Research] University of Lethbridge(カナダ)

    • Related Report
      2019 Research-status Report
  • [Int'l Joint Research] University of Rijeka(クロアチア)

    • Related Report
      2019 Research-status Report
  • [Int'l Joint Research] IPM(イラン)

    • Related Report
      2019 Research-status Report
  • [Int'l Joint Research] Pusan National University(韓国)

    • Related Report
      2019 Research-status Report
  • [Int'l Joint Research] レスブリッジ大学(カナダ)

    • Related Report
      2018 Research-status Report
  • [Int'l Joint Research] 釜山国立大学(韓国)

    • Related Report
      2018 Research-status Report
  • [Int'l Joint Research] リュブリャナ大学(スロベニア)

    • Related Report
      2018 Research-status Report
  • [Journal Article] A Family of Balanced Generalized Weighing Matrices2022

    • Author(s)
      Kharaghani Hadi、Pender Thomas、Suda Sho
    • Journal Title

      Combinatorica

      Volume: 42 Issue: 6 Pages: 881-894

    • DOI

      10.1007/s00493-021-4774-4

    • Related Report
      2022 Annual Research Report 2021 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Square (1,-1)-matrices with large determinants and near-Hadamard matrices2022

    • Author(s)
      K. Momihara, S. Suda, Q. Xiang
    • Journal Title

      Linear Algebra and its Applications

      Volume: 654 Pages: 28-55

    • DOI

      10.1016/j.laa.2022.08.028

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Quasi-balanced weighing matrices, signed strongly regular graphs and association schemes2022

    • Author(s)
      Kharaghani Hadi、Pender Thomas、Suda Sho
    • Journal Title

      Finite Fields and Their Applications

      Volume: 83 Pages: 102065-102065

    • DOI

      10.1016/j.ffa.2022.102065

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Q-polynomial coherent configurations2022

    • Author(s)
      Suda Sho
    • Journal Title

      Linear Algebra and its Applications

      Volume: 643 Pages: 166-195

    • DOI

      10.1016/j.laa.2022.02.009

    • Related Report
      2021 Research-status Report
    • Peer Reviewed
  • [Journal Article] Balanced weighing matrices2022

    • Author(s)
      Kharaghani Hadi、Pender Thomas、Suda Sho
    • Journal Title

      Journal of Combinatorial Theory, Series A

      Volume: 186 Pages: 105552-105552

    • DOI

      10.1016/j.jcta.2021.105552

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Balancedly splittable orthogonal designs and equiangular tight frames2021

    • Author(s)
      Kharaghani Hadi、Pender Thomas、Suda Sho
    • Journal Title

      Designs, Codes and Cryptography

      Volume: 89 Issue: 9 Pages: 2033-2050

    • DOI

      10.1007/s10623-021-00897-1

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Divisible design digraphs and association schemes2021

    • Author(s)
      Kharaghani Hadi、Suda Sho
    • Journal Title

      Finite Fields and Their Applications

      Volume: 69 Pages: 101763-101763

    • DOI

      10.1016/j.ffa.2020.101763

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Disjoint weighing matrices2020

    • Author(s)
      Kharaghani Hadi、Suda Sho、Tayfeh-Rezaie Behruz
    • Journal Title

      Journal of Algebraic Combinatorics

      Volume: - Issue: 1 Pages: 27-41

    • DOI

      10.1007/s10801-020-00981-0

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Commutative association schemes obtained from twin prime powers, Fermat primes, Mersenne primes2020

    • Author(s)
      Hadi Kharaghani, Sho Suda
    • Journal Title

      Finite Fields and Their Applications

      Volume: 63 Pages: 101631-101631

    • DOI

      10.1016/j.ffa.2019.101631

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] On Tight 4-Designs in Hamming Association Schemes2020

    • Author(s)
      Gavrilyuk Alexander L.、Suda Sho、Vidali Jano?
    • Journal Title

      Combinatorica

      Volume: - Issue: 3 Pages: 345-362

    • DOI

      10.1007/s00493-019-4115-z

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Linked systems of symmetric group divisible designs of type?II2019

    • Author(s)
      Kharaghani Hadi、Suda Sho
    • Journal Title

      Designs, Codes and Cryptography

      Volume: 印刷中 Issue: 10 Pages: 2341-2360

    • DOI

      10.1007/s10623-019-00622-z

    • Related Report
      2018 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Balancedly splittable Hadamard matrices2019

    • Author(s)
      Kharaghani Hadi、Suda Sho
    • Journal Title

      Discrete Mathematics

      Volume: 342 Issue: 2 Pages: 546-561

    • DOI

      10.1016/j.disc.2018.10.021

    • Related Report
      2018 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Presentation] On complete orthogonal arrays of strength 32022

    • Author(s)
      Alexander Gavrilyuk, Sho Suda
    • Organizer
      Stinson66 - New Advances in Designs, Codes and Cryptography
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] On complete orthogonal arrays of strength 32022

    • Author(s)
      Alexander Gavrilyuk, Sho Suda
    • Organizer
      第38回代数的組合せ論シンポジウム
    • Related Report
      2022 Annual Research Report
  • [Presentation] Two topics on equiangular tight frames2022

    • Author(s)
      Sho Suda
    • Organizer
      Codes and Expansions (CodEx) Seminar
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Equiangular tight frameに関するある予想について2022

    • Author(s)
      須田庄
    • Organizer
      2022 早稲田整数論研究集会
    • Related Report
      2021 Research-status Report
    • Invited
  • [Presentation] Balanced Generalized Weighing matrices and Association Schemes2021

    • Author(s)
      Sho Suda
    • Organizer
      Virtual Carleton Combinatorics Meeting 2021
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] On the eigenvalues of graphs of mutually orthogonal Sudoku Latin squares2021

    • Author(s)
      Sho Suda
    • Organizer
      Groups and Graphs, Semigroups and Synchronization
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] 直交数独方陣グラフの固有値2021

    • Author(s)
      須田庄
    • Organizer
      スペクトラルグラフ理論および周辺領域 第10回研究集会
    • Related Report
      2021 Research-status Report
    • Invited
  • [Presentation] Distance sets in pseudo-Euclidean spaces2021

    • Author(s)
      Sho Suda
    • Organizer
      The 34thWorkshop on Algebraic Graph Theory and its Applications
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] On the multiplicities of digraph2020

    • Author(s)
      Sho Suda
    • Organizer
      The 3rd Workshop on Algebraic Graph Theory and its Applications
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Linked systems of symmetric group divisible designs2019

    • Author(s)
      Sho Suda
    • Organizer
      9th Slovenian International Conference on Graph Theory
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] On tight 4-designs in Hamming association schemes2019

    • Author(s)
      Sho Suda
    • Organizer
      第36回代数的組合せ論シンポジウム
    • Related Report
      2019 Research-status Report
    • Invited
  • [Presentation] Hadamard matrices and related combinatorics2019

    • Author(s)
      Sho Suda
    • Organizer
      Japanese Conference on Combinatorics and its Applications
    • Related Report
      2019 Research-status Report
    • Invited
  • [Presentation] On tight 4-designs in Hamming association schemes2019

    • Author(s)
      須田庄
    • Organizer
      日本数学会2019年度年会
    • Related Report
      2018 Research-status Report
  • [Presentation] On the Smith normal form of a skew-symmetric D-optimal design of order $n\equiv 2\pmod{4}$2018

    • Author(s)
      Sho Suda
    • Organizer
      The 86-th KPPY Combinatorics Seminar
    • Related Report
      2018 Research-status Report
  • [Presentation] Balancedly splittable Hadamard matrices2018

    • Author(s)
      Sho Suda
    • Organizer
      The Japanese Conference on Combinatorics and its Applications (JCCA 2018)
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] Complex spherical designs and codes2018

    • Author(s)
      Sho Suda
    • Organizer
      Design theory and Quantum information
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] The maximum number of diamonds in tournaments2018

    • Author(s)
      須田庄
    • Organizer
      日本数学会2018年度秋季総合分科会
    • Related Report
      2018 Research-status Report
  • [Presentation] On tight 4-designs in Hamming association schemes2018

    • Author(s)
      Sho Suda
    • Organizer
      Design Theory from the Viewpoint of Algebraic Combinatorics
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] On tight 4-designs in Hamming association schemes2018

    • Author(s)
      須田庄
    • Organizer
      スペクトラルグラフ理論および周辺領域 第7回研究集会
    • Related Report
      2018 Research-status Report
    • Invited

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

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