1. School of Mathematics and Statistics, Northeastern University at Qinhuangdao, Qinhuangdao, China
2. School of Computer and Communication Engineering, Northeastern University at Qinhuangdao, Qinhuangdao, China
3. Computing Center, Northeastern University at Qinhuangdao, Qinhuangdao, China
4. Computer Science and Engineering, Northeastern University, Shenyang, China