1.College of Mathematics and Computer Science,Huanggang Normal University,Huanggang,Hubei 438000,China 2.School of Computer Science and Technology,Wuhan University of Technology,Wuhan 430063,China 3.Department of Fundamental,Xuzhou Air Force Academy,Xuzhou,Jiangsu 221000,China 4.No.4 Department,Air Force Radar Academy,Wuhan 430019,China