[Wang, Shiguo; Lin, Chang] Changsha Univ Sci & Technol, Comp & Commun Engn Inst, Changsha 410114, Peoples R China.
[Ruby, Rukhsana] Shenzhen Univ, Coll Comp Sci & Software, Shenzhen 518060, Peoples R China.
[Ruan, Xiukai] Wenzhou Univ, Coll Elect & Elect Engn, Wenzhou 325035, Peoples R China.
[Ruan, Xiukai] Wenzhou Univ, Inst Intelligent Locks, Wenzhou 325035, Peoples R China.
[Deng, Qingyong] Guangxi Normal Univ, Sch Software, Sch Comp Sci & Engn, Guilin, Peoples R China.