1. School of Mathematics and Statistics, Qilu University of Technology (Shandong Academy of Sciences),Jinan,Shandong,China,250353
2. School of Electrical Engineering and Automation, Qilu University of Technology (Shandong Academy of Sciences),Jinan,Shandong,China,250353
3. Landong Hou with the School of Electrical Engineering and Automation, Qilu University of Technology (Shandong Academy of Sciences),Jinan,Shandong,China,250353
4. School of Control Science and Engineering, Shandong University,Jinan,China