Some new results on mutually orthogonal frequency squares
Some new results on mutually orthogonal frequency squares
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关于相互正交频率平方的一些新结果
DOI:
10.1016/j.disc.2014.05.006
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发表时间:
2014-09
影响因子:
0.8
通讯作者:
Du, Beiliang
中科院分区:
文献类型:
--
作者:
Li, Mingchao;Zhang, Yan;Du, Beiliang
Let n= λ m. A frequency square F (n; λ) is an n× n array in which each of m distinct symbols appears exactly λ times in each row and column. Two such squares are said to be orthogonal if upon superposition, each of the m 2 distinct ordered pairs occurs exactly λ 2 times. Hedayat, Sloane and Stufken in their book Hedayat et al.(1999) provided a small table of lower bounds for the maximum number of mutually orthogonal frequency squares of type F (n; λ)(HSS Table), and posed the following research problem: Improve the lower bound for the entries in HSS Table. Laywine and Mullen in 2001 extended the table (LM Table). In this article we will give some new construction methods of mutually orthogonal frequency squares. As an application we improve the lower bounds for more than half of the entries in LM Table.
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DOI:
--
发表时间:
2001
期刊:
Ars Comb.
影响因子:
--
作者:
C. Laywine;G. Mullen
通讯作者:
C. Laywine;G. Mullen
DOI:
10.1201/9781420010541-17
发表时间:
2006-11
期刊:
--
影响因子:
--
作者:
M. Greig;C. Colbourn
通讯作者:
M. Greig;C. Colbourn
影响因子:
0.7
作者:
D. T. Todorov
通讯作者:
D. T. Todorov
DOI:
10.1201/9781420010541-14
发表时间:
2006
期刊:
Angewandte Chemie (International Ed. in English)
影响因子:
--
作者:
R. Julian;R. Abel;C. Colbourn;J. Dinitz
通讯作者:
R. Julian;R. Abel;C. Colbourn;J. Dinitz
影响因子:
0.9
作者:
W. D. Launey
通讯作者:
W. D. Launey