[1] Information Science and Engineering, Yanshan University, No. 438, Hebei Avenue, Qinhuangdao, China
[2] School of Mathematics and Information Science and Technology, Hebei Normal University of Science and Technology, No. 360, West Hebei Street, Qinhuangdao, China
[3] School of Foreign Languages, Yanshan University, No. 438, Hebei Avenue, Qinhuangdao, China