Akihiro Munemasa

Profile Information

Affiliation: Professor, Graduate School of Information Sciences Department of Computer and Mathematical Sciences Mathematical Structures Mathematical Structures I, Tohoku University

Degree: Ph. D.(Ohio State University)

J-GLOBAL ID: 200901003156143100
researchmap Member ID: 1000043132

External link: http://db.tohoku.ac.jp/whois/e_detail/86e812e77541c225151f152051ae0efa.html

Research Interests

Research Areas

Committee Memberships

Apr, 2000 - Present

Editors-in-Chief, Journal of Algebraic Combinatorics
Apr, 2000 - Present

Editors-in-Chief, Journal of Algebraic Combinatorics

Papers

Signed analogue of line graphs and their smallest eigenvalues

Alexander L. Gavrilyuk, Akihiro Munemasa, Yoshio Sano, Tetsuji Taniguchi

Journal of Graph Theory, 98(2) 309-325, Jun 8, 2021
Complex Hadamard Matrices Attached to a 3-Class Nonsymmetric Association Scheme

Takuya Ikuta, Akihiro Munemasa

Graphs and Combinatorics, 35 1293-1304, May, 2019 Peer-reviewed
Some restrictions on weight enumerators of singly even self-dual codes II

Masaaki Harada, Akihiro Munemasa

Interdiscip. Inform. Sci., 24 77-85, Jun, 2018 Peer-reviewed
Butson-Type complex Hadamard matrices and association schemes on Galois rings of characteristic 4

Takuya Ikuta, Akihiro Munemasa

Special Matrices, 6(1) 1-10, Jan 1, 2018 Peer-reviewed
Nonexistence of certain singly even self-dual codes with minimal shadow

Stefka Bouyuklieva, Masaaki Harada, Akihiro Munemasa

Electronic J. Combin., 25 P1.13, Jan, 2018 Peer-reviewed
On a Lower Bound for the Laplacian Eigenvalues of a Graph

Gary R. W. Greaves, Akihiro Munemasa, Anni Peng

GRAPHS AND COMBINATORICS, 33(6) 1509-1519, Nov, 2017 Peer-reviewed
On s-extremal singly even self-dual [24 kappa+8,121 kappa+4, 4 kappa+2] codes

Masaaki Harada, Akihiro Munemasa

FINITE FIELDS AND THEIR APPLICATIONS, 48 306-317, Nov, 2017 Peer-reviewed
Self-dual codes and the non-existence of a quasi-symmetric 2-(37,9,8) design with intersection numbers 1 and 3

Masaaki Harada, Akihiro Munemasa, Vladimir D. Tonchev

J. Combin. Designs, 25 469-476, Aug, 2017 Peer-reviewed
Godsil-McKay switching and twisted Grassmann graphs

Akihiro Munemasa

DESIGNS CODES AND CRYPTOGRAPHY, 84(1-2) 173-179, Jul, 2017 Peer-reviewed
On the classification of self-dual Zk-codes II

Masaaki Harada, Akihiro Munemasa

Interdiscip. Inform. Sci., 22(1) 81-85, Nov, 2016 Peer-reviewed
On the classification of self-dual [20,10,9] codes over GF(7)

Masaaki Harada, Akihiro Munemasa

FINITE FIELDS AND THEIR APPLICATIONS, 42(1) 57-66, Nov, 2016 Peer-reviewed
Equiangular lines in Euclidean spaces

Gary Greaves, Jacobus H. Koolen, Akihiro Munemasa, Ferenc Szoellosi

JOURNAL OF COMBINATORIAL THEORY SERIES A, 138 208-235, Feb, 2016 Peer-reviewed
On the smallest eigenvalues of the line graphs of some trees

Akihiro Munemasa, Yoshio Sano, Tetsuji Taniguchi

LINEAR ALGEBRA AND ITS APPLICATIONS, 466 501-511, Feb, 2015 Peer-reviewed
Edge-signed graphs with smallest eigenvalue greater than - 2

Gary Greaves, Jack Koolen, Akihiro Munemasa, Yoshio Sano, Tetsuji Taniguchi

JOURNAL OF COMBINATORIAL THEORY SERIES B, 110 90-111, Jan, 2015 Peer-reviewed
Complex Hadamard Matrices contained in a Bose-Mesner algebra

Takuya Ikuta, Akihiro Munemasa

Special Matrices, 3(1) 91-110, Jan 1, 2015 Peer-reviewed
Fat Hoffman graphs with smallest eigenvalue greater than-3

Akihiro Munemasa, Yoshio Sano, Tetsuji Taniguchi

DISCRETE APPLIED MATHEMATICS, 176(SI) 78-88, Oct, 2014 Peer-reviewed
On fat Hoffman graphs with smallest eigenvalue at least-3

Hye Jin Jang, Jack Koolen, Akihiro Munemasa, Tetsuji Taniguchi

ARS MATHEMATICA CONTEMPORANEA, 7(1) 105-121, 2014 Peer-reviewed
Fat Hoffman graphs with smallest eigenvalue at least-1-tau

Akihiro Munemasa, Yoshio Sano, Tetsuji Taniguchi

ARS MATHEMATICA CONTEMPORANEA, 7(1) 247-262, 2014 Peer-reviewed
Residue codes of extremal Type II Z(4)-codes and the moonshine vertex operator algebra

Masaaki Harada, Ching Hung Lam, Akihiro Munemasa

MATHEMATISCHE ZEITSCHRIFT, 274(1-2) 685-700, Jun, 2013 Peer-reviewed
Upper bounds on cyclotomic numbers

Koichi Betsumiya, Mitsugu Hirasaka, Takao Komatsu, Akihiro Munemasa

Linear Algebra and Its Applications, 438(1) 111-120, Jan 1, 2013 Peer-reviewed

Misc.

Self-Orthogonal Designs and Equitable Partitions (計算代数システムによる新しい数学の開拓と進展)

宗政昭弘

数理解析研究所講究録, (2012) 23-30, Dec, 2016
Complex Hadamard matrices attached to some association schemes (Designs, Codes, Graphs and Related Areas)

Ikuta Takuya, Munemasa Akihiro

RIMS Kokyuroku, 1956 137-152, Jul, 2015
Steiner quadruple systems with abelian regular automorphism group (Finite Groups, Vertex Operator Algebras and Combinatorics)

Munemasa Akihiro

RIMS Kokyuroku, 1656 55-64, Jul, 2009
The Codes and the Lattices of Hadamard Matrices (Finite Groups and Algebraic Combinatorics)

Munemasa Akihiro, Tamura Hiroki

RIMS Kokyuroku, 1593 154-161, Apr, 2008
Self -Orthogonal Designs(Algebraic combinatorics and the related areas of research)

Munemasa Akihiro

RIMS Kokyuroku, 1476 70-77, Mar, 2006
Binary singly even self-dual code に関連した extremal problem(組合せデザインとその周辺における数理的基礎およびそれらの応用)

宗政昭弘

数理解析研究所講究録, 1465 130-137, Jan, 2006
Spherical Designs

Akihiro Munemasa

Handbook of Combinatorial Designs, Second Edition, 2006
Arithmetic and combinatories

A Munemasa

EUROPEAN JOURNAL OF COMBINATORICS, 25(4) 457-457, May, 2004
The 2000 Com (2)MaC conference on Association schemes, codes and designs - Preface

E Bannai, A Munemasa, SY Song, P Terwilliger

DISCRETE MATHEMATICS, 264(1-3) 1-1, Mar, 2003
Spherical 5-Designs Obtained from the Unitary Group $U_{2m} (2)$ (Codes, lattices, vertex operator algebras and finite groups)

Munemasa Akihiro

RIMS Kokyuroku, 1228 121-126, Sep, 2001
Type II codes over $\mathbf{F}_2+u\mathbf{F}_2$ and an application to Hermitian modular forms (Algebraic Combinatorics)

Bannai Eiichi, Harada Masaaki, Munemasa Akihiro, Oura Manabu

RIMS Kokyuroku, 1109 22-25, Aug, 1999
Realizability of parameter sets for association schemes in terms of vertex independence problem

Munemasa Akihiro

RIMS Kokyuroku, 962 81-85, Aug, 1996
有限群の作用に付随したfusion algebra(代数的組合せ論)

宗政昭弘

数理解析研究所講究録, 846 39-45, Jun, 1993
A local characterization of the graph of alternating forms

Munemasa Akihiro

RIMS Kokyuroku, 840 121-123, May, 1993
Fusion in Association Schemes

Munemasa Akihiro

RIMS Kokyuroku, 768 23-28, Nov, 1991

Presentations

Group theoretic aspects of the theory of association schemes

International Workshop on Algebraic Combinatorics, Oct 28, 2016
Triply even codes obtained from some graphs and finite geometries

Graphs and Groups, Spectra and Symmetries, Aug 15, 2016
Self-orthogonal designs and equitable partitions

Algebraic Combinatorics Workshop, Sep 20, 2015
Extremal type II Z4-codes of length 24 and triply even binary codes of length 48

ICM2014 Satellite Conference on Algebraic Coding Theory, Aug 12, 2014
Generalized tensor products and related constructions

Workshop on Algebraic Design Theory and Hadamard Matrices, Jul 10, 2014
Complex Hadamard matrices contained in a Bose-Mesner algebra

Algebraic Combinatorics, Jun 27, 2014
Godsil-McKay switching and twisted Grassmann graphs

The Eighth Shanghai Conference on Combinatorics, May 27, 2014
Twisted symplectic polar graphs

Workshop on Algebraic Combinatorics, Nov 20, 2013
Graphs with complete multipartite mu-graphs

Incidence Geometry and Buildings, Feb 6, 2012
Constructive enumeration of self-dual codes using tools from permutation groups

International Conference on Coding and Cryptography, Aug 25, 2011
Combinatorial structures derived from extremal even unimodular lattices

Algebra and Combinatorics, Mar, 2006
Extremal lattices and spherical designs

Geometric and Algebraic Combinatorics 3, Aug, 2005
Extremal lattices and spherical designs

Com2MaC Conference on Association Schemes, Jul, 2004

Professional Memberships

Research Projects

spherical designs

The Other Research Programs, Apr, 2003 - Present
algebraic coding theory

Basic Science Research Program, Jan, 1998 - Present
algebraic graph theory

The Other Research Programs, Jul, 1989 - Present
整化可能な代数構造の代数的グラフ理論による特徴付け及び分類

科学研究費助成事業, 基盤研究(C), 日本学術振興会, Apr, 2021 - Mar, 2024

谷口哲至, 宗政昭弘
Noncommutative association schemes, coherent algebras, their irreducible decompositions and applications

Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (C), Japan Society for the Promotion of Science, Apr, 2020 - Mar, 2023
Eigenvalues of association schemes and characters of finite groups

Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (C), Japan Society for the Promotion of Science, Apr, 2017 - Mar, 2020

Munemasa Akihiro
On Characterisations and Classifications of graphs by their Eigenvalues

Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (C), Japan Society for the Promotion of Science, Apr, 2016 - Mar, 2020

Taniguchi Tetsuji
Comprehensive research on algebraic coding theory

Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (B), Japan Society for the Promotion of Science, Apr, 2015 - Mar, 2019

Harada Masaaki, MIYAMOTO masahiko, KITAZUME masaaki, WADAYAMA tadashi, ARAYA makoto, BETSUMIYA koichi, OURA manabu, SHIMAKURA hiroki, TANAKA hajime, SUDA sho
Various aspects of sporadic simple groups

Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (B), Japan Society for the Promotion of Science, Apr, 2012 - Mar, 2018

KITAZUME MASAAKI, SAWABE Masato, MUNEMASA Akihiro, CHIGIRA Naoki, HARADA Masaaki, ABE Toshiyuki, SHIMAKURA Hiroki, NAKASORA Hiroyuki, HORIGUCHI Naoyuki, IRIE Yuuki, KOBAYASHI Yusuke
Constructions of spherical designs using finite groups and lattices

Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (C), Japan Society for the Promotion of Science, Apr, 2014 - Mar, 2017

Munemasa Akihiro
グラフの最小固有値とユークリッド空間内の等角直線族

科学研究費助成事業, 特別研究員奨励費, 日本学術振興会, Apr, 2014 - Mar, 2016

宗政昭弘, GREAVES GARY, GREAVES Gary
Challenging of the existence problem of a certain self-dual code through combinatorial designs and lattices

Grants-in-Aid for Scientific Research, Grant-in-Aid for Challenging Exploratory Research, Japan Society for the Promotion of Science, Apr, 2014 - Mar, 2016

Harada Masaaki, MUNEMASA Akihiro, SHIMAKURA Hiroki
A elucidation of the structure of graphs by Algebraic Graph Theory and Spectral Graph Theory

Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (C), Japan Society for the Promotion of Science, Apr, 2013 - Mar, 2016

Taniguchi Tetsuji, Seto Michio, Sano Yoshio, Tanaka Hajime
Constructions of complex Hadamard matrices using Algebraic Combinatorics and its applications

Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (C), Japan Society for the Promotion of Science, Apr, 2013 - Mar, 2016

Ikuta Takuya, MUNEMASA AKIHIRO
複素アダマール行列と関連した組合せ構造

科学研究費助成事業, 特別研究員奨励費, 日本学術振興会, Apr, 2012 - Mar, 2015

宗政昭弘, SZOLLOSI Ferenc
A New Development of Algebraic Coding Theory

Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (B), Japan Society for the Promotion of Science, Apr, 2011 - Mar, 2015

HARADA Masaaki, MUNEMASA Akihiro, KITAZUME Masaaki, WADAYAMA Tadashi, ARAYA Makoto, HAGIWARA Manabu
Analytic, Algebraic and Combinatorial studies on continued fractions

Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (C), Japan Society for the Promotion of Science, Apr, 2010 - Mar, 2014

KOMATSU Takao, MUNEMASA Akihiro, AKIYAMA Shigeki, TANAKA Takaaki
最小固有値に制限を加えたグラフの研究

科学研究費助成事業, 特別研究員奨励費, 日本学術振興会, 2012 - 2013

宗政昭弘, GREAVES Gary
Algebraic coding theory and combinatorial designs

Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (C), Japan Society for the Promotion of Science, 2008 - 2010

HARADA Masaaki, MUNEMASA Akihiro, KITAZUME Masaaki, ARAYA Makoto
Research on algebraic coding theory and its applications for vertex operator algebras

Grants-in-Aid for Scientific Research, Grant-in-Aid for Scientific Research (C), Japan Society for the Promotion of Science, 2007 - 2010

BETSUMIYA Koichi, MUNEMASA Akihiro, HARADA Masaaki, YAMAUCHI Hiroshi, SHIMAKURA Hiroki, LAM Ching Hung

Other

距離正則グラフと球面上のデザイン

Jul, 2009 - Jul, 2009

距離正則グラフの球面上への表現と、関連するグラフのスペクトルについての代数的研究を通じて日韓の研究者の交流を促進する。
距離正則グラフとその周辺

Jul, 2007 - Jul, 2007

距離正則グラフと関連する組合せ構造についての代数的研究を通じて日韓の研究者の交流を促進する。

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