To solve the problems encountered in lodging claims in international project,the author of this paper first puts forw ard a preliminary expert system——claim matrix,for the purpose of enhancing the work efficiency and securing more successes in making claims through sharing th e claim expert[KG-4]s rich knowledge and experience.

This paper first analyzes-the mechanism of claim and puts forward the concept of construction claim matrix on the mechanism, establishes case-matching model and risk judgement model for construction claim and establishes the different calculating models of progress and cost claim.

This paper proposes a new efficient encoding algorithm and a new Min-Sum decoding algorithm for the π-rotation LDPC codes based on the row index matrix and column index matrix of parity check matrix H.

Utilizing certain sets of m-dimensional vectors and introducing search Matrix, this paper designs an arithmetic that adds and merges row by row at search Matrices.

Algorithm for seeking all LCS by matrix search;

In this paper, the application of Matrix seek method for avoid deadlock in a computer system is proposed.