Institution: | 1.College of Information Science and Engineering,YanShan University,Qinhuangdao,China;2.Qian’an College,North China University of Science and Technology,Qian’an,China;3.The Key Laboratory for Computer Virtual Technology and System Integration of Hebei Province,Qinhuangdao,China;4.Science College,North China University of Science and Technology,Tangshan,China |