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| Content Provider | IEEE Xplore Digital Library |
|---|---|
| Author | Meng Chen Xin Xia |
| Copyright Year | 2011 |
| Description | Author affiliation: JiangXi Vocational Technical College of Industry&Trade, NanChang, 330038 P. R. China (Xin Xia) || The Department of Computer, NanChang University, NanChang, 330031 P. R. China (Meng Chen) |
| Abstract | Tolerance relation, similarity relation and characteristic relation are discussed. Three types unknown attribute value of “missing value”, “lost value” and “any value” are discussed. Semantically, “missing value”, denoted by “∗”, is the same as the unknown value in the tolerance relation, “lost value”, denoted by “?”, is the same as the unknown value in the similarity relation and the “lost value” in the characteristic relation, and “any value”, denoted by “#”, is same as “do not care” condition in characteristic relation. The difference of The definitions of new incomplete information system, attribute similarity and object similarity are given to process the incomplete information system with three types unknown attribute value. Base on these definitions, a new characteristic relation is proposed, characteristic class; lower approximation and upper approximation are defined for new characteristic relation. |
| Starting Page | 100 |
| Ending Page | 105 |
| File Size | 253298 |
| Page Count | 6 |
| File Format | |
| ISBN | 9781457703720 |
| e-ISBN | 9781457703713 |
| DOI | 10.1109/GRC.2011.6122575 |
| Language | English |
| Publisher | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Publisher Date | 2011-11-08 |
| Publisher Place | Taiwan |
| Access Restriction | Subscribed |
| Rights Holder | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Subject Keyword | Uncertainty Conferences incomplete information system Semantics characteristic relation tolerance relation Educational institutions similarity relation Entropy rough set Approximation methods Information systems |
| Content Type | Text |
| Resource Type | Article |
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