Correlativity between summer (June -August) precipitation and earlier potential height field at 500hpa of Northern Hemisphere was analyzed by using the local pattern analogue coefficient (LPAC) and the differance chart, Key area shown in LPAC chart were attempted for precipitation forecast in summer and better effect was gotten.

The near infrared spectra of metronidazole tablets were determined directly by near infrared diffuse reflectance spectroscopy (NIRDRS), and treated by convolution transform-visualized fingerprint-similarity coefficient analytical system.

Based on the characteristic matrix and the code of parts, a similarity coefficient of machine tools which has a new form is defined.

A method of fault isolating and recognizing using fault similarity coefficient is presented.

This article still proposes the investgative method for chemical reaction kinetics, elaborates its principle by pattern recognization, expounds sample norm's choice and similar coefficient calculation, puts forword to chemical reaction mechanism determined by patern recognization and general steps of kinetic parameter, and gives calculative examples.

Based on the theory and method of gray relational analysis,the similar coefficient was introduced to reduce the influent of relational degree affected by the maximum value or the minimum value in data and relational coefficient.

Owing to the accuracy of traditional Fuzzy Neural Network(FNN) forecasting model is limited by the existence of multicollinearity among matrix samples,a novel FNN model is proposed where the conditional number algorithm is used,and the training samples are chosen by means of similar coefficient computation.