Title :
New operators in variable precision covering rough set
Author_Institution :
Key Lab. of Numerical Simulation of Sichuan Province, Neijiang Normal Univ., Neijiang, China
Abstract :
Both the β upper approximation and lower approximation operators in variable precision covering rough set model based on neighborhood do not keep intersection operation, which means that the information may be lost in the operations of intersection. A new pair of covering upper and lower boundary regions operators are defined in variable precision covering rough set and their properties are discussed. Using them, two inequalities well known in the variable precision covering rough set become equalities. With the change, no information will be lost in the new expressions.
Keywords :
approximation theory; rough set theory; lower approximation operator; upper approximation operator; variable precision covering rough set; Educational institutions; Information science; Intelligent systems; Laboratories; Mathematical model; Mathematics; Numerical simulation; Process control; Set theory; Systematics; neighborhood; operator; precision covering rough set;
Conference_Titel :
Computer Design and Applications (ICCDA), 2010 International Conference on
Conference_Location :
Qinhuangdao
Print_ISBN :
978-1-4244-7164-5
Electronic_ISBN :
978-1-4244-7164-5
DOI :
10.1109/ICCDA.2010.5541171
