There exist two formulations of rough sets: the conceptual and computational one. The conceptual or semantical approach of rough set theory focuses on the meaning and interpretation of concepts, while algorithms to compute those concepts are studied in the computational formulation. However, the research on the former is rather limited. In this paper, we focus on a semantically sound approach o...

In this paper, we would like to present some modal logics with semantics based on rough set theory and related notions. In addition to surveying some well-known results about the links between modal logics and rough set theory, we also develop some new applied logics inspired I)y generalized rough set theory. Kcywor(ls: Rough set, modal logic, cpistcmic logic. 1 I n t r o d u c t i o n Tile rou...

Relational data has become increasingly important in decision analysis recent years, and so mining knowledge which preserves relationships between objects is an topic. Graphs can represent the contains objects. Rough set theory provides effective tool for extracting knowledge, but it not sufficient to extract containing on In order extend application scope enrich rough theory, essential develop...