Aiming at the deficiencies of current mutation algorithm based on artificial immune system,such as fault positive is high and the efficiency is very low,an improved evolution optimization with mutation algorithm is proposed.

Analysis of nonstandard phenomenon of modern Chinese from the perspective of grammatical variation;

Compared with the research on phonetic variation,the research on grammatical variation is weaker.

On the guide of variation sociolinguistics, this paper considers all the features discovered or to be discovered as grammatical variation in Singapore Mandarin and studies its variables and usages.

Grammar Variation and Pragmatic Effect of Mobile Phone Short Message

This could inevitably destroy the logic narration and language regulation which caused the grammar variation.

The two deviations that will be focused on are grammatical deviation and graphological deviation.

Evaluation of operational reliability for DC converter stations by using variation coefficient method;

The weights of the indices were determined by variation coefficient method,and the level was identified by using confidence rule according to the attribute measure values of single index and multiple indices.

To solve the question of performance evaluation on enterprise incubators,a set of index system is established used to evaluate the performance of enterprise incubators,and to decide the weight of indices by using variation coefficient method.