Affiliation: | (College of Electrical Engineering and Automation,Shandong University of Science and Technology,Qingdao 266590,China;College of Mathematics and Systems Science,Shandong University of Science and Technology,Qingdao 266590,China;School of Mathematical Science,Liaocheng University,Liaocheng 252059,China;College of Electrical and Information Engineering,Anhui University of Technology,Ma’anshan 243032,China) |