1. Qingdao University,College of Electrical Engineering,Qingdao,China,266071
2. Weifang Vocational College,School of Mechanical and Electrical Engineering,Weifang,China,261041
3. Qingdao University,Institute of Complexity Science,Qingdao,China,266071
4. Shandong University of Science and Technology,College of Mathematics and Systems Science,Qingdao,China,266000