[Xiang, Xuemei; Liu, Anfeng] Cent S Univ, Sch Comp Sci, Changsha 410083, Hunan, Peoples R China
[Liu, Wei] Hunan Univ Chinese Med, Sch Informat, Changsha 410208, Hunan, Peoples R China
[Wang, Tian] Huaqiao Univ, Dept Comp Sci & Technol, Xiamen 361021, Fujian, Peoples R China
[Xie, Mande] Zhejiang Gongshang Univ, Sch Comp Sci & Informat Engn, Hangzhou 310018, Zhejiang, Peoples R China
[Li, Xiong] Hunan Univ Sci & Technol, Sch Comp Sci & Engn, Xiangtan 411201, Peoples R China