An sample parallel AC/DC power system is calculated and analysised on the basis of eigen-analysis theory,rotor-angle instability and voltage instability are discriminated using relative factors,and some prelininary conclusions is reached.

By Eigen-analysis,participating factor and H_∞controller as instrument,and by system Eigen value and H_∞norm as optimal index,the optimal allocation for TCSC are realized.

Based on the sufficient research of synthetic geologic information of auriferous magmatite,geology,minerals,geochemical exploration and remote sensing in Yanshan district,making use of characteristic analysis,a prospecting prognositic model of regional synthetic information has been established.

The basic concepts of extension information are introduced, such as relative length, relative degree, similarity degree to different information and so on, which form the theory of characteristic analysis.

Then characteristic analysis method was used to predict target areas in Gejiu district on MORPAS system.

Taking 17 monitoring spots of industrial parks in Panyu District,Guangzhou as an example,characteristic analysis method was used to optimise atmospheric monitoring spot.

Measurable index of component reusability is analyzed,a characteristic analysis method is applied to computation of index weight,and reusability index is measured by a fuzzy synthesis evaluation s method.

There are a few methods for estimating the PN(pseudo-random) code of DS/SS(direct sequence spread spectrum) signals, such as eigenanalysis and phase adding methods.