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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math.CO2023★ 1 cited

Hadamard matrices of orders 60 and 64 with automorphisms of orders 29 and 31

Makoto Araya, Masaaki Harada, Vladimir D. Tonchev

A classification of Hadamard matrices of order $2 p + 2$ with an automorphism of order $p$ is given for $p = 29$ and $31$ . The ternary self-dual codes spanned by the newly found Hadamar…

math.CO2023

Ternary extremal four-negacirculant self-dual codes

Masaaki Harada, Keita Ishizuka, Hadi Kharaghani

In this note, we give basic properties of ternary four-negacirculant self-dual codes. By exhaustive computer search based on the properties, we complete a classification of ternary…

math.CO2023

Hadamard matrices of order $36$ formed by codewords in some ternary self-dual codes

Masaaki Harada, Keita Ishizuka

In this note, we study the existence of Hadamard matrices of order $36$ formed by codewords of weight $36$ in some ternary near-extremal self-dual codes of length $36$ .

Hadamard matrices of orders 60 and 64 with automorphisms of orders 29 and 31

Ternary extremal four-negacirculant self-dual codes

Hadamard matrices of order 36 formed by codewords in some ternary self-dual codes

Hadamard matrices of order $36$ formed by codewords in some ternary self-dual codes