[Tan, Jiawei; Liu, Anfeng] Cent S Univ, Sch Informat Sci & Engn, Changsha 410083, Hunan, Peoples R China.
[Liu, Wei] Hunan Univ Chinese Med, Sch Informat, Changsha 410208, Hunan, Peoples R China.
[Xie, Mande] Zhejiang Gongshang Univ, Sch Comp Sci & Informat Engn, Hangzhou 310018, Zhejiang, Peoples R China.
[Song, Houbing] Embry Riddle Aeronaut Univ, Dept Elect Comp Software & Syst Engn, Daytona Beach, FL 32114 USA.
[Zhao, Ming] Cent S Univ, Sch Software, Changsha 410075, Hunan, Peoples R China.