期刊
INTERNATIONAL JOURNAL OF MACHINE LEARNING AND CYBERNETICS
卷 4, 期 6, 页码 621-630出版社
SPRINGER HEIDELBERG
DOI: 10.1007/s13042-012-0128-2
关键词
Formal concept analysis; Concept lattice; Rough set; Lower approximation; Upper approximation
资金
- National Natural Science Foundation of China [60963006, 61173181, 61075120]
- Humanities and Social Science funds Project of Ministry of Education of China [11XJJAZH001, 09YJCZH082]
- Zhejiang Provincial Natural Science Foundation of China [LZ12F03002]
- Science and Technology Project of Qingdao [12-1-4-4-(9)-jch]
In this paper, we introduce two pairs of operators in fuzzy formal contexts. Based on the proposed operators, we present two kinds of multi-level formal concepts. We also propose two pairs of rough approximation operators by employing the two kinds of multi-level formal concepts. By the proposed rough set approximation operators, we not only approximate a crisp set, but also approximate a fuzzy set. Finally, we discuss the properties of the proposed approximation operators in details.
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