[1] School of Computer Science and Technology, Xi'an University of Technology, Xi'an, 710048, China
[2] State Key Laboratory of Rail Traffic Control and Safety, Beijing Jiaotong University, China, Beijing, 100044, China
[3] Computer Science Graduate Course, Graduate School of Science and Technology, Nihon University, Narashino 7-24-1, Funabashi 274-8501, Japan