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| Received:October 21, 2009Revised:July 24, 2010 |
| 基金项目:This work was supported by the Guangdong National Natural Science Foundation of China (No. 8151030301000004), and the Guangdong Plan Project of Science and Technology, China (No. 2009B010800056). |
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| A transformation algorithm for incompatible information systems based on variable precision values |
| Jiuying DENG,Qinruo WANG,Qiang CHEN,Baoyu YE |
| (Automation Faculty, Guangdong University of Technology; Guangdong University of Education) |
| Abstract: |
| The variable precision rough set (VPRS) model extends the basic rough set (RS) theory with finite universes and finite evaluative measures. VPRS is concerned with the equivalence and the contained relationship between two sets. In incompatible information systems, the inclusion degree and β upper (lower) approximation of the inconsistent equivalence class to the decision equivalence classes may be affected by the variable precision. The analysis of an example of incompatible decision table shows that there is a critical point in β available-values region. In the new β range limited at the critical point, the incompatible decision table can be converted to the coordination decision table reliably. The method and its algorithm implement are introduced for the critical value search. The examples of the inconsistent equivalence class transformation are exhibited. The results illustrate that this algorithm is rational and precise. |
| Key words: Inconsistent equivalence class Inclusion degree Incompatible decision table Variable precision |
