In order to measure the uncertainty of grinding force quantitatively, the symmetric fuzzy number in fuzzy set and the linear planning optimization theory are used to establish the fuzzy measurement model of grinding force, and then a crisp measurement method, defined as code modification, is presented.

Heuristic algorithm to rough set attribute reduction based on discernibility matrix;

Approach to heuristic knowledge reduction based on discernibility matrix;

Efficient algorithm of attribute reduction based on Skowron's discernibility matrix

Xunzi puts forward a systematic social management thought of "longli zhongfa" based on his hypothesis of "evil human nature",taking "mingfen shiqun" as theoretical basis,and taking maintaining feudalist hierarchic system as the starting up point.

Key Words:demarcate household;drainage of the same floor;house kitchen;bathroo