Title :
Generalized upper and lower approximations in set-valued information systems
Author :
Liu, Qiong ; Pei, Zheng ; Yi, Liangzhong ; Yang, Jilin
Author_Institution :
Sch. of Math. & Comput. Eng., Xihua Univ., Chengdu, China
Abstract :
Under the framework of set-valued information system, based on application of quantifiers and OWA operator, the definition on upper and lower approximations is generalized to the common form associated with the parameter lambdaepsi [0, 1]. The advantage of such generalization is that it could be flexibly used by restriction of additional linguistic quantifier, and is favorable to the further discussion on knowledge reduction and rules extraction in such model.
Keywords :
formal logic; mathematical operators; set theory; OWA operator; formal logic; generalized lower approximation; generalized upper approximation; knowledge reduction; linguistic quantifier; rules extraction; set-valued information system; Approximation methods; Data mining; Information systems; Logic; Set theory; Uncertainty; Virtual colonoscopy;
Conference_Titel :
Fuzzy Systems, 2009. FUZZ-IEEE 2009. IEEE International Conference on
Conference_Location :
Jeju Island
Print_ISBN :
978-1-4244-3596-8
Electronic_ISBN :
1098-7584
DOI :
10.1109/FUZZY.2009.5277253
