A transformation algorithm for incompatible information systems based on variable precision values  

作　　者：JiuyingDENG Qinruo WANG Qiang CHEN Baoyu YE 

机构地区：[1]Automation Faculty, Guangdong University of Technology, Guangzhou Guangdong 510009, China [2]Guangdong University of Education, Guangzhou Guangdong 510303, China

出　　处：《控制理论与应用（英文版）》2012年第1期113-117,共5页

基　　金：supported by the Guangdong National Natural Science Foundation of China (No. 8151030301000004);the Guangdong Plan Project of Science and Technology, China (No. 2009B010800056)

摘　　要：The variable precision rough set （VPRS） model extends the basic rough set （RS） theory with finite uni- verses 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/3 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 fl available-values region. In the new/3 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.The variable precision rough set （VPRS） model extends the basic rough set （RS） theory with finite uni- verses 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/3 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 fl available-values region. In the new/3 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.

关 键 词：Inconsistent equivalence class Inclusion degree Incompatible decision table Variable precision 

分 类 号：TP18[自动化与计算机技术—控制理论与控制工程] TP309[自动化与计算机技术—控制科学与工程]