[1] Shanghai Jiao Tong Univ, Sch Elect Informat & Elect Engn, Shanghai 200240, Peoples R China
[2] Waseda Univ, Grad Sch Informat Prod & Syst, Tokyo 1698050, Japan
[3] Univ Tokyo, Sch Engn, Tokyo 1130033, Japan
[4] Manchester Metropolitan Univ, Dept Comp & Math, Manchester M15 6BH, England
[5] Woxsen Univ, Woxsen Sch Business, Hyderabad 502345, India
[6] Lebanese Amer Univ, Dept Comp Sci & Math, Beirut 11022801, Lebanon
[7] Illinois Inst Technol, Dept Informat Technol & Management, Chicago, IL 60616 USA