M. Harada

activity

20082023

most citedBinary linear complementary dual codes

56 citations · 269 across the 60 of their papers we have counts for

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Showing 2017Show all

6 papers · 1 filter

math.CO2017★ 13 cited

New extremal singly even self-dual codes of lengths $64$ and $66$

Damyan Anev, Masaaki Harada, Nikolay Yankov

For lengths $64$ and $66$ , we construct extremal singly even self-dual codes with weight enumerators for which no extremal singly even self-dual codes were previously known to exis…

math.CO2017

Nonexistence of certain singly even self-dual codes with minimal shadow

Stefka Bouyuklieva, Masaaki Harada, Akihiro Munemasa

It is known that there is no extremal singly even self-dual $[n, n /2, d]$ code with minimal shadow for $(n, d) = (24 m + 2, 4 m + 4)$ , $(24 m + 4, 4 m + 4)$ , $(24 m + 6, 4 m + 4)$ , $(24 m + 10, 4 m + 4)$ and $(24m…

math.CO2017

On the classification of $Z_{4}$ -codes

Makoto Araya, Masaaki Harada, Hiroki Ito +1

In this note, we study the classification of $Z_{4}$ -codes. For some special cases $(k_{1}, k_{2})$ , by hand, we give a classification of $Z_{4}$ -codes of length $n$ and t…

math.CO2017

Extremal Type II $Z_{4}$ -codes constructed from binary doubly even self-dual codes of length $40$

Masaaki Harada

In this note, we demonstrate that every binary doubly even self-dual code of length $40$ can be realized as the residue code of some extremal Type II $Z_{4}$ -code. As a cons…

math.CO2017★ 12 cited

Binary extremal self-dual codes of length $60$ and related codes

Masaaki Harada

We give a classification of four-circulant singly even self-dual $[60, 30, d]$ codes for $d = 10$ and $12$ . These codes are used to construct extremal singly even self-dual $[60,30,12]…

math.CO2017

Some restrictions on weight enumerators of singly even self-dual codes II

Masaaki Harada, Akihiro Munemasa

In this note, we give some restrictions on the number of vectors of weight $d /2 + 1$ in the shadow of a singly even self-dual $[n, n /2, d]$ code. This eliminates some of the possible w…

New extremal singly even self-dual codes of lengths 64 and 66

Nonexistence of certain singly even self-dual codes with minimal shadow

On the classification of Z4​-codes

Extremal Type II Z4​-codes constructed from binary doubly even self-dual codes of length 40

Binary extremal self-dual codes of length 60 and related codes

Some restrictions on weight enumerators of singly even self-dual codes II

New extremal singly even self-dual codes of lengths $64$ and $66$

On the classification of $Z_{4}$ -codes

Extremal Type II $Z_{4}$ -codes constructed from binary doubly even self-dual codes of length $40$

Binary extremal self-dual codes of length $60$ and related codes