The article has analyzed the several factors of influencing a supermarket profit and loss with the RS theory of attribute reduce,and obtained the satisfactory answer of the question.

According to main features of electronic countermeasure equipment collocation, this paper brings forth using RS theory to solve the problem.

Key frame can dramatically reduce the data of the video indexing,so the paper presents a new approach for key frame extraction based on RS theory and I frame.

Rough set theory and fuzzy neural network are combined,to take full advantages of the two of them.

In this paper, Rough Set theory has been discussed, by analyzing and synthesizing Data Mining algorithm based on Rough Set Theory, definition of extended discerni.

The multivariate extremal theory and the establishment of joint distribution of extreme wind speed and wave height based on this theory are introduced.

By using "reasonableness and satisfaction index" and multi-value theory,analysis and evaluation of ten cultivars of Pyrus pyrifolia introduced to the trial base of Central South Forestry University were performed,and the which were based on twelve factors,such as weight of per fruit,content of total sugar,content of total acids,and so on.