不完备信息系统中基于联系度的粗集模型拓展_黄兵.pdfVIP

2004 1 1 : 1000-6788( 2004) 01-0088-05 黄　兵, 周献中 ( 1004 , 210094) : , . : , , . , , . : ; ; ; ; ; : TP 18: A Extension of Roug Set Model Based on Connection Degree under in Complete Information Systems HUAN G Bing, ZHOU Xian-z ong ( , , 210094, ) Depart ment of Automat ion Nanjing U niversity of Science Tec nology Nanjing C ina Abstract : In t is paper, several extended roug set models are analyzed and anot er model is present- . , . ed In t is model t res olds are introduced and an incomplet e system is divided into tw o parts T e aim of tolerant relation based on connection degree is to ascert ain classes by w ic t e lower approxima- tion set and upper approximat ion set of a set in universe are confirmed. By an example, t is model pre- . sent ed in t is paper is accord w it facts It is important t at man can control t e partit ion of universe in some w ay by t res olds. Accordingly , roug set models under incomplete system are extended effec- tively . Key words : roug set ; equivalent relat ion; tolerance relation; similarity relation; limited tolerance relation; t olerance relation based on connection degree 1 [ 1] 1982 Paw lak , . , . , . , , , ( ) , , , . , . , , , , . , , . , ( null value) . [ 2] : 1) . , ; 2) . , ; 3) . . , . : 2002-11-20 : ( 1972) , , , , , : 1 89 : 1) . , ; 2) . , . ,