Koichi Betsumiya

According to our database, Koichi Betsumiya authored at least 18 papers between 1999 and 2012.

Collaborative distances:

• Dijkstra number of five.
• Erdős number of four.

2012

On triply even binary codes.

Koichi Betsumiya, Akihiro Munemasa

J. Lond. Math. Soc., 2012

A Complete Classification of Doubly Even Self-dual Codes of Length 40.

Koichi Betsumiya, Masaaki Harada, Akihiro Munemasa

Electron. J. Comb., 2012

2011

Hadamard matrices of order 32 and extremal ternary self-dual codes.

Koichi Betsumiya, Masaaki Harada, Hiroshi Kimura

Des. Codes Cryptogr., 2011

2009

Mass Formula for Even Codes over.

Koichi Betsumiya, Rowena Alma L. Betty, Akihiro Munemasa

Proceedings of the Cryptography and Coding, 2009

2008

Minimum Lee weights of Type II codes over <i>I</i>.

Koichi Betsumiya

Discret. Math., 2008

2005

Codes over F₄, Jacobi forms and Hilbert-Siegel modular forms over Q(sqrt(5)).

Koichi Betsumiya, YoungJu Choie

Eur. J. Comb., 2005

Ozeki Polynomials and Jacobi Forms.

Koichi Betsumiya, YoungJu Choie

Ars Comb., 2005

2004

Optimal self-dual codes over F₂*F₂ with respect to the Hamming weight.

Koichi Betsumiya, Masaaki Harada

IEEE Trans. Inf. Theory, 2004

Jacobi forms over totally real fields and type II codes over Galois rings GR(2^m, <i>f</i>).

Koichi Betsumiya, YoungJu Choie

Eur. J. Comb., 2004

Type II codes over F_2^m+uF_2^m.

Koichi Betsumiya, San Ling, Fidel R. Nemenzo

Discret. Math., 2004

2003

On self-dual codes over some prime fields.

Koichi Betsumiya, Stelios Georgiou, T. Aaron Gulliver, Masaaki Harada, Christos Koukouvinos

Discret. Math., 2003

Extremal Self-Dual Codes over F₂ × F₂.

Koichi Betsumiya, T. Aaron Gulliver, Masaaki Harada

Des. Codes Cryptogr., 2003

Formally Self-Dual Codes Related to Type II Codes.

Koichi Betsumiya, Masaaki Harada

Appl. Algebra Eng. Commun. Comput., 2003

2001

On type II codes over F₄.

Koichi Betsumiya, T. Aaron Gulliver, Masaaki Harada, Akihiro Munemasa

IEEE Trans. Inf. Theory, 2001

Classification of Formally Self-Dual Even Codes of Lengths up to 16.

Koichi Betsumiya, Masaaki Harada

Des. Codes Cryptogr., 2001

Binary Optimal Odd Formally Self-Dual Codes.

Koichi Betsumiya, Masaaki Harada

Des. Codes Cryptogr., 2001

Type II Codes over F_2^r.

Koichi Betsumiya, Masaaki Harada, Akihiro Munemasa

Proceedings of the Applied Algebra, 2001

1999

Binary Optimal Linear Rate 1/2 Codes.

Koichi Betsumiya, T. Aaron Gulliver, Masaaki Harada

Proceedings of the Applied Algebra, 1999