›› 2008, Vol. 25 ›› Issue (2): 197-203.DOI: 10.7523/j.issn.2095-6134.2008.2.009
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LIUYuMei1 ;YANGShouBao1; CHENWanMing2; GUOLeiTao1; WEIDong1
1DepartmentofComputerScience,UniversityofScienceandTechnologyofChina,Hefei230026,China;
2DepartmentofAutomation,UniversityofScienceandTechnologyofChina,Hefei230026,China