1.College of Computer Science and Technology, Tianjin University,Tianjin 300072, China
2.College of Computer Science and Information Engineering, Tianjin University of Science and Technology, Tianjin 300222, China
3.College of Computer and Information Technology, Henan Normal University, Xinxiang Henan 453007, China
4.Department of Basic, Academy of Military Transportation, Tianjin 300161, China