Zobrazeno 1 - 10
of 25
pro vyhledávání: '"Chihiro Suetake"'
Publikováno v:
Journal of Combinatorial Designs. 31:87-123
Autor:
Yutaka Hiramine, Chihiro Suetake
Publikováno v:
Designs, Codes and Cryptography. 75:509-518
A $$k\times u\lambda $$ k × u ? matrix $$M=[d_{ij}]$$ M = [ d i j ] with entries from a group $$U$$ U of order $$u$$ u is called a $$(u,k,\lambda )$$ ( u , k , ? ) -difference matrix over $$U$$ U if the list of quotients $$d_{i\ell }{d_{j\ell }}^{-1
Autor:
Chihiro Suetake, Kenzi Akiyama
Publikováno v:
Discrete Mathematics. 308:6449-6465
V. C. Mavron and V. D. Tonchev [V.C. Mavron, V.D. Tonchev, On symmetric nets and generalized Hadamard matrices from affine designs, J. Geom. 67 (2000) 180-187] constructed a symmetric transversal design STD"3[9;3] which admits an automorphism group a
Autor:
Chihiro Suetake, Kenzi Akiyama
Publikováno v:
Journal of Combinatorial Designs. 16:411-430
In this article, we prove that there does not exist a symmetric transversal design which admits an automorphism group of order 4 acting semiregularly on the point set and the block set. We use an orbit theorem for symmetric transversal designs to pro
Autor:
Chihiro Suetake, Yutaka Hiramine
Publikováno v:
Discrete Mathematics. 308(15):3257-3264
In this paper we show that if a square transversal design TD"@l[k;u], say D(=(P,B)), admits a class semiregular automorphism group G of order s, then we have a |P|s by |P|s matrix M with entries from [email protected]?{0} satisfying (*)M(M^(^-^1^))^T
Autor:
Chihiro Suetake
Publikováno v:
Designs, Codes and Cryptography. 37:525-528
In this note we construct a symmetric transversal design STD7[21; 3]. Therefore there exists an orthogonal array OA(63, 21, 3, 2).
Autor:
Chihiro Suetake
Publikováno v:
Designs, Codes and Cryptography. 37:293-304
In this article we prove that there is only one symmetric transversal design STD4[12;3] up to isomorphism. We also show that the order of the full automorphism group of STD4[12; 3] is 25· 33 and Aut STD4[12;3] has a regular subgroup as a permutation
Autor:
Chihiro Suetake
Publikováno v:
Journal of Combinatorial Theory, Series A. 93:93-111
In this article we show that projective planes with a small collineation group of perspectivities can be used to construct Hadamard designs.
Autor:
Chihiro Suetake
Publikováno v:
European Journal of Combinatorics. 21(7):967-972
The study of blocking semiovals in finite projective planes was motivated by Batten in connection with cryptography. Dover in studied blocking semiovals in a finite projective plane of order q which meet some line inq− 1 points. In this note, some
Autor:
Chihiro Suetake
Publikováno v:
European Journal of Combinatorics. 21:973-980
The study of blocking semiovals in finite projective planes was motivated by Batten in connection with cryptography and was begun by Dover . In this note, two new families of blocking semiovals are constructed in desarguesian planes.