WANG Min1,GAO Tai-ping1,2,LIU Hong-ying1,3,YAN Yu-qi1
1.School of Computer & Information Technology,Shanxi University,Taiyuan 030006,China 2.Key Laboratory of Ministry of Education for Computation Intelligence & Chinese Information Processing,Taiyuan 030006,China 3.School of Mathematics and Computer Science,Shanxi Datong University,Datong,Shanxi 037009,China