School of Information Science and Engineering;
Yanshan University;
Qinhuangdao 066004;
Hebei Province;
E R.China;
The Key Laboratory for Computer Virtual Technology and System Integration of Hebei Province;
Qinhuangdao 066004;
P. R. China;
Liaoning University of Technology;
Jinzhou 121001;
Liaoning Province;
P. R. China;