[Ren, Yingying; Chen, Miaojiang; Liu, Anfeng] Cent South Univ, Sch Comp Sci & Engn, Changsha 410083, Peoples R China.
[Liu, Wei] Hunan Univ Chinese Med, Sch Informat, Changsha 410208, Hunan, Peoples R China.
[Zhang, Ning] Univ Windsor, Dept Elect & Comp Engn, 401 Sunset, Windsor, ON, Canada.
[Li, Junling] Univ Waterloo, Dept Elect & Comp Engn, 200 Univ Ave, Waterloo, ON, Canada.
[Yi, Meng] Southeast Univ, Schooltemp Comp Sci & Engn, Nanjing, Peoples R China.