The inclusion relation among the two definitions of the attribute core in the algebra view and information view of rough set theory and the resu.

In view of the deficiency in existing methods for Objective Attribute Weight Determining(OAWD) based on rough set theory,by integrating information view and the algebra view of rough set,optimization method of OAWD is given,then the optimal solution of integrated weight is got.

This article mainly analyzes the relation between rough set and vague set from the algebra view and information view.

Abstract: This paper, taking usefulness of accounting earnings information as starting point, utilizes simple regression model and studies the function of accounting earnings from three side that "information perspective", "valuation perspective", "contract perspective".

This paper introduces and analyses the three functions: information perspective, valuation model perspective and measurement perspective in securities market and puts forward the development direction of the research between accounting information.

With the dramatic development of finance, history cost based information under information perspective can t satisfy investor s needs of more useful information; On the other hand, the development of information technology, especially internet technology, makes fair value measurement possible.