[Hu, Bin] Changsha Univ Sci & Technol, Sch Comp & Commun Engn, Changsha 410114, Hunan, Peoples R China.
[Guo, Kehua; Hu, Bin; Guo, KH] Cent South Univ, Sch Comp Sci & Engn, South Rd LuShan, Changsha 410083, Hunan, Peoples R China.
[Guo, Kehua] Xiangjiang Lab, Changsha, Hunan, Peoples R China.
[Ren, Sheng] Hunan Univ Arts & Sci, Sch Comp & Elect Engn, Changde 415000, Hunan, Peoples R China.
[Fang, Hui] Loughborough Univ, Comp Sci, Epinal Way, Loughborough LE11 3TU, Leics, England.