School of Computer Science & Engineering;
Nanjing University of Science & Technology;
Nanjing 210094;
China;
Dept. of Electronic & Information Engineering;
Hunan Vocational Institute of Safety & Technology;
Changsha 410151;
China;
School of Computer Science & Engineering;
Nanjing University of Science & Technology;
Nanjing 210094;
China;
College of Computer & Communications Engineering;
Changsha University of Science & Technology;
Changsha 410114;
China;
Dept. of Electronic & Information Engineering;
Hunan Vocational Institute of Safety & Technology;
Changsha 410151;
China;