A variable muitlgranulation rough sets approach

Authors:
Ming Zhang;Zhenmin Tang;Weiyan Xu;Xibei yang
Affiliations:
School of Computer Science and Technology, Nanjing University of Science and Technology, Nanjing, Jiangsu, P.R. China;School of Computer Science and Technology, Nanjing University of Science and Technology, Nanjing, Jiangsu, P.R. China;School of Mathematics and Physics, Jiangsu University of Science and Technology, Zhenjiang, Jiangsu, P.R. China;School of Computer Science and Engineering, Jiangsu University of Science and Technology, Zhenjiang, Jiangsu, P.R. China
Venue:
ICIC'11 Proceedings of the 7th international conference on Intelligent Computing: bio-inspired computing and applications
Year:
2011

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Abstract

By analyzing the limitations of optimistic multigranulation rough set and pessimistic multigranulation rough set, the concept of the variable multigranulation rough set is proposed. Such multigranulation rough set is a generalization of both optimistic and pessimistic multigranulation rough set. Furthermore, not only the basic properties about the variable multigranulation rough set is discussed, but also the relationships among optimistic, pessimistic and variable multigranulation rough sets are deeply explored. These results are meaningful for the development of multigranulation rough set theory.