A NEW CONSTRUCTION FOR ALMOST RESOLVABLE TWO-FOLD PMD_S

In this pa per,a neui method of constructing almost resolvable two-fold PMDs is given by using finite, fields and elementary Abelian groups. And some new results are also mentioned     

有向设计和完备的错位纠正码

介绍了基于有向设计编制完备错位纠正码的若干方法，包括一些存在性结果。     

关于五元集复盖二元集的一些结果

本文证明了当v≡10,14,18(mod20) 时,除13个可能的例外,复盖数 C(v,5,2)=[v/5[(v-1)/4]], 其中[x]表示不小于x的最小整数。同时,对v≡9,13,17(mod20)的情况,给出了C(v,5,2)的渐近结果。     

某些新的k=6且λ=1的平衡不完全区组设计(英文)

Let X be a v-set. Let A be a family of some k-subsets (called bl-ocks) of X. The pair (X, A) is called a balanced incomplete blockdesign, denoted by (u, k, λ) -BIBD, if any two distinct elements ofX are contained in exactly λ blocks of A. Some simple computationshows, for any given integers v, k and λ, a (v, k, λ)-BIBD existsonly if