| The rough set theory was put forward by Professor Z. Pawlak, Poland Mathematic, as a math theory to study uncertain knowledge. It can analysis and process effectively all kinds of immaturity information as inexactness, uncertain, uncompleted, find implicative knowledge and open out potential rules. The main idea of the rough set theory depicts approximately learning of inaccurate and uncertain by using the known. Fuzzy theory was advanced by L.A.Zadeh, an America specialist in the field of computer and control in 1965, as a math theory to process fuzzy phenomena and fuzzy notion. It depicts approximately affiliated degree about fuzzy set by object. At the last few years, it has extensive use in the fields of machine- learning and knowledge acquisition, data mining, decision support andanalysis. The mom jraph of Z. Pawlak that < |
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