[He, Zhikai] Changsha Univ Sci & Technol, Sch Mech & Vehicle Engn, Changsha 410114, Peoples R China.
[Xu, Rui; Meng, Qisong] Changsha Univ Sci & Technol, Chengnan Coll, Changsha 410114, Peoples R China.
[Wang, Binyu] Georgia Inst Technol, Sch City & Reg Planning, Atlanta, GA 30332 USA.
[Tang, Qiang] Anhui Univ Sci & Technol, Sch Artificial Intelligence, Hefei 231131, Peoples R China.
[Shen, Li] Beijing Inst Technol, Sch Informat & Elect, Beijing 100080, Peoples R China.