This paper describes some alts hiring measures and their profits in order make Bohai Platform Company to adapt to the intense market competition at home and abroad to improve greatly its labourers' system in the engineering construction.

This paper proposed that job rotation could be an effective way to intraorganizational transfer of tacit knowledge.

This article raises the following solutions: establish good corporate culture,job rotation,talents assessment and evaluation,help staff to draw up profession plan and so on.

The process of 4-step braiding is analyzed as an example to describe the application of the proposed method by expressing a braiding cycle as a product of disjoint cycles.

By means of analyzing the equivalence relation of reversible gate logic network to permutation group,the reversible gate network cascade was converted into the cycle of symmetric group.

Let D be a selfcomplementary digraph with V(D)={1,2,…,n}, then the isomorphism between D and Dc can be represented as a permutation, σ, on the set V(D), σ(D)=Dc and it is assumed that all permutations are expressed as the product of disjoint cycles.