2007•Natural Science Journal of Xiangtan UniversityRequires access

Variable Rough Set Model and Its Properties for Incomplete Information System

Da-kuan Wei

Abstract

Research on rough set theory has been focused on rough set extended models for incomplete information system for recent years.The general binary relation-based variable rough set model is proposed on the bases of rough set models based on tolerance relation,non-symmetrical similarity relation and limited-tolerance relation,which is the generalization of rough set models based on various of special binary relations(e.g.tolerance relation,non-symmetrical similarity relation,limited tolerance relation,valued tolerance relation and etc.),and of variable-precision rough set model for incomplete information system.The properties of variable rough set model for incomplete information system are further studied in this paper.

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Key concepts: Rough set, Relation (database), Binary relation, Generalization, Dominance-based rough set approach, Mathematics, Similarity (geometry), Set (abstract data type)