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Koichi Betsumiya

dblp:02/2214 · DBLP profile ↗
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7ranked-venue papers
7as first author
0since 2021 · last 2011
—ORCID · none

Domains — the database's venue-derived domains; a paper can count in several

Security and privacy · 5 · 5 first-authorTheory of computation · 2 · 2 first-author

Expertise — from the expertise taxonomy: the topics of the expert's papers under the CCF categories. A weight counts papers with recency: 1 for a paper about the topic, 0.3 when the topic is its context, halved every five years.

Theoretical computer science
2 papers
Coding theory · 100%

Topics — the 4 heaviest of 4, each with the papers that count most for it

TopicWeightPapersLastEvidence papers
Coding theory › error-correcting codes › block codes › linear code
self-dual codes		 0.122004
Optimal self-dual codes over F2*F2 with respect to the Hamming weight · IEEE Trans. Inf. Theory 2004
On type II codes over F4 · IEEE Trans. Inf. Theory 2001
Coding theory › error-correcting codes › code construction
optimal code construction		 0.012004
Optimal self-dual codes over F2*F2 with respect to the Hamming weight · IEEE Trans. Inf. Theory 2004
Coding theory
hamming weight		 0.012004
Optimal self-dual codes over F2*F2 with respect to the Hamming weight · IEEE Trans. Inf. Theory 2004
Coding theory › error-correcting codes › lee codes
lee weight		 0.012001
On type II codes over F4 · IEEE Trans. Inf. Theory 2001
YearPublicationVenuePosition
2011 Hadamard matrices of order 32 and extremal ternary self-dual codes
Koichi Betsumiya, Masaaki Harada, Hiroshi Kimura
 Des. Codes Cryptogr.1
2009 Mass Formula for Even Codes over
Koichi Betsumiya, Rowena Alma L. Betty, Akihiro Munemasa
 IMACC1
2004 Optimal self-dual codes over F2*F2 with respect to the Hamming weight
abstract
In this paper, we study optimal self-dual codes and type IV self-dual codes over the ring F/sub 2//spl times/F/sub 2/ of order 4. We give improved upper bounds on minimum Hamming and Lee weights for such codes. Using the bounds, we determine the highest minimum Hamming and Lee weights for such codes of lengths up to 30. We also construct optimal self-dual codes and type IV self-dual codes.
Koichi Betsumiya, Masaaki Harada
 IEEE Trans. Inf. Theory1
2003 Extremal Self-Dual Codes over F2 × F2
Koichi Betsumiya, T. Aaron Gulliver, Masaaki Harada
 Des. Codes Cryptogr.1
2001 Binary Optimal Odd Formally Self-Dual Codes
Koichi Betsumiya, Masaaki Harada
 Des. Codes Cryptogr.1
2001 Classification of Formally Self-Dual Even Codes of Lengths up to 16
Koichi Betsumiya, Masaaki Harada
 Des. Codes Cryptogr.1
2001 On type II codes over F4
abstract
Previously, Type II codes over F/sub 4/ have been introduced as Euclidean self-dual codes with the property that all Lee weights are divisible by four. In this paper, a number of properties of Type II codes are presented. We construct several extremal Type II codes and a number of extremal Type I codes. It is also shown that there are seven Type II codes of length 12, up to permutation equivalence.
Koichi Betsumiya, T. Aaron Gulliver, Masaaki Harada, Akihiro Munemasa
 IEEE Trans. Inf. Theory1