Momihara Koji

モミハラコウジ | Momihara Koji

Affiliation and department：
Job title： Associate Professor
Homepage URL (1)： https://sites.google.com/view/kojimomihara/home

Research field (2)： Applied mathematics and statistics , Basic mathematics

Research keywords (6)：有限幾何 , Difference set , Association scheme , Strongly regular graph , Hadamard matrix , Combinatorics

Research theme for competitive and other funds (11)：

2024 - 2028 A new development for the maximum determinant problem based on difference families and Ramanujan graphs
2020 - 2025 マトロイドの臨界問題の新展開と解決への複合的アプローチ
2020 - 2024 Constructive research towards solving the existence problem on Hadamard matrices
2017 - 2020 有限幾何と代数的手法に基づく有限体上のデザイン・グラフ・符号の新たな構成法の提案
2015 - 2020 符号・球面デザイン・グループテストに内在する組合せデザインとその最適性の研究

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Papers (64)：

Koji Momihara, Sho Suda. Strongly regular graphs from pseudocyclic association schemes. Graphs and Combinatorics. 2024. 出版予定
Hiroki Kajiura, Koji Momihara. Difference sets in pseudocyclic association schemes. Discrete Mathematics. 2023. 346. 113598
The existence of Cameron-Liebler line classes with parameter $\frac{(q+1)^2}{3}. 2023. 2253
Makoto Araya, Masaaki Harada, Koji Momihara. Hadamard matrices related to a certain series of ternary self-dual codes. Designs, Codes and Cryptography. 2022
Koji Momihara, Sho Suda, Qing Xiang. Square (1,-1)-matrices with large determinants and near-Hadamard matrices. Linear Algebra and its Applications. 2022. 654. 28-55

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Lectures and oral presentations (67)：

Strongly regular graphs from pseudocyclic association schemes
(2024)
Strongly regular graphs and association schemes from pseudocyclic association schemes
(2023 International Conference on Combinatorics and Finite Geometry 2023)
The existence of Cameron-Liebler line classes with parameter x =(q+1)^2/3
(RIMS共同研究(研究集会)『有限群論,代数的組合せ論,頂点代数の研究』 2022)
有理数体または二次体の元となる有限体上のガウス和の冪と関連する組合せ論
(愛媛大学『第89回代数セミナー』 2022)
Partial difference sets of Latin square type or negative Latin square type in abelian non p-groups
(The 6-th International Workshop on Algebraic Designs, Hadamard Matrices & Quanta 2022)

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Works (9)：

研究集会『直交デザインと関連する組合せ論』の主催
佐竹翔平, 須田庄, 籾原幸二 2023 - 2023
「JCCA-2020・離散数学とその応用研究集会2020・スペクトラルグラフ理論および周辺領域第9回研究集会」の主催
河原林健一, 清水理佳, 鈴木一弘, 高澤兼二郎, 谷口哲至, 松本直己, 宗政昭弘, 籾原幸二, 八島高将, 盧暁南, 和地輝仁 2020 - 2020
「JCCA-2019・離散数学とその応用研究集会2019・スペクトラルグラフ理論および周辺領域第8回研究集会」の主催
河原林健一, 垣村尚徳, 谷口哲至, 土屋翔一, 松井泰子, 向江頼士, 宗政昭弘, 籾原幸二 2019 -
研究集会「Hadamard matrices and their applications」の主催
宗政昭弘, 原田昌晃, 島倉裕樹, 田中太初, 籾原幸二 2018 -
The 15th Japan-Korea workshop on Algebra and Combinatoricsの主催
栗原大武, 溝口佳寛, 籾原虎児, 田上真 2017 -

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Education (2)：

2005 - 2009 Nagoya University Graduate School of Information Science Graduate School of Information Science
2001 - 2005 Hiroshima University School of Education

Professional career (1)：

Work history (7)：

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Committee career (1)：

Awards (3)：

Association Membership(s) (2)：

The Institute of Combinatorics and its Applications , THE MATHEMATICAL SOCIETY OF JAPAN

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