[Li, Ting; Ming, Zhao] Cent South Univ, Sch Comp Sci & Engn, Changsha, Peoples R China.
[Liu, Wei] Hunan Univ Chinese Med, Sch Informat, Changsha, Peoples R China.
[Wang, Tian] Huaqiao Univ, Coll Comp Sci & Technol, Xiamen, Peoples R China.
[Li, Xiong] Hunan Univ Sci & Technol, Sch Comp Sci & Engn, Xiangtan, Peoples R China.
[Ma, Ming] SUNY Stony Brook, Dept Comp Sci, Stony Brook, NY 11794 USA.