集值信息系统下基于λ-近似的属性相对约简  

Attribute Relative Reduction of Set-valued Information Systems Based on λ-Approximations

作　　者：刘琼[1] 裴峥[1] 伊良忠[1] 魏冬梅[1] 孔明明[1] 

机构地区：[1]西华大学数学与计算机学院,四川成都610039

出　　处：《模糊系统与数学》2010年第6期156-162,共7页Fuzzy Systems and Mathematics

基　　金：四川省重大科技专项项目(2008GZ0118);四川省高校重点实验室资助项目(SGXZD1002-10;XED0818);四川省教育厅重点项目(2006A084)

摘　　要：针对集值信息系统,基于相容关系下的极大相容类及OWA算子的性质,提出了λ-近似算子,给出了λ-近似算子下的λ-上、下近似集合,并分析了λ-近似算子的性质。同时,借鉴基于属性重要度的启发式约简算法,通过模糊化λ-下近似集合,进一步得到了属性的相对依赖度及属性的相对约简。In this paper,the definition on approximation operators associated with λ is proposed in set-valued information systems,based on the maximal tolerance classes of tolerance relation and properties of OWA operator,from which λupper and λ-lower approximation sets are given.And the properties of λ-approximation operators is discussed.Further,by fuzzed of λ-lower approximation sets and the concept of heuristic algorithm on attribute significance,attributes relative dependency degree and attribute relative reduction would be provided.

关 键 词：集值信息系统 极大相容类 OWA算子 λ-近似 相对约简 

分 类 号：O159[理学—数学]