Dynamic information system and its rough set model based on time sequence

Uncertain problems in fields of economy, population, medical treatment and real estate always present the extraordinary nature of inconsistency and process. With the aim to adapt traditional rough set theory and put it into dynamic information system, this paper first constructs dynamic information system based on time sequence and relevant rough set model, on the circumstances of keeping universe and attribute set intact. Secondly, it presents some properties of equivalent class and rough set based on time sequence during the alterative process of information system. Thus, this paper paves the way for further research on the theories and applications of rough set based on dynamic information systems. Index Terms—Rough Set, Time Sequence, Dynamic Information System