... Foundation of China (Grant no.10771227), Program for New Century Excellent Talent of Educational Ministry of China(Grant no. NCET-05-0759), Doctorate Foundation of Educational Ministry of China(Grant ... Department of Computer Science, Hong Kong Baptist University,Kowloon, Hong KongEmail address: yytang@cqu.edu.cnJianqiu Cao: School of Computer and Information, Chongqing Jiaotong University,Chongqing ... University, Chongqing 400044, China;School of Computer and Information, Chongqing Jiaotong University, Chongqing 400074, ChinaEmail address: xfyang1964@yahoo.comLimin Cui: Department of Computer...