This paper improves the model based on the fuzzy optimum theory,which uses the difference matrix method to compare the reference project and other projects.

From finite field and difference matrix,two recursive constructions for external difference families are given and it is proved that there exists a(q,3×2,1)-external difference family for any prime power q≡1(mod 24).

TELESIS error matrixes correction of BESII.;

All errors of the simulation turntable are descripted with the bar error matrix and pair error matrix, and building procedure of the coordinate system of the simulation turntable is expounded.

An improved method of error matrix is used, and a simple method of error control is presented.

A deviation matrix method of the consistency check in AHP is given.

According to deviation matrix of judgement matrix,the new method the consistency check accomplished without complex mathematical calculation.

According to the deviation matrix of judgment matrix it can seek accurately elements of larger deviation and make rectification.

This paper offers a heuristic search algorithm which is relative reduce by differential matrix calculating.

This paper point out the common errors of the simplify algorithm of calculating reduced differential matrix in use and provide the correcting way.

Skowron s differential matrix theory makes the reduce processes of rough set more simple.

Considering the generalized linear regression model y=Xβ+e,e～N(0,σ 2W) and its prediction problem of biased estimation, this paper discusses its superiority of the optimal and classical predictors based on the ridge estimation by criteria of mean dispersion error matrix and generalized risk function.

Considering the generalized linear regression model and its prediction problem of biased estimation,this paper discusses its superiority of the optimal and classical predictors based on the shrunken principal estimator by criteria of mean dispersion error matrix and generalized risk function.