S-rough Sets and Characteristics of Data Mining Unit Circle
S-粗集与数据挖掘单位圆特征

One direction singular rough sets and the structure of dual of one direction singular rough sets were given.One direction singular rough sets and dual of one direction singular rough sets come from improved Z.Pawlak rough sets.One direction singular rough sets and dual of one direction singular rough sets have dynamic characteristics.The relation between one direction singular rough sets,dual of one direction singular rough sets and Z.Pawlak rough sets was also proposed.S-rough sets have three types of form...