1. College of Electrical Engineering and Automation, Shandong University of Science and Technology, Qingdao, People's Republic of China
2. Ecole National Supérieure de Techniques Avancées (ENSTA) Bretagne, Brest, France
3. Lab-STICC, UMR CNRS 6285, Brest, France
4. College of Engineering, Ocean University of China, Qingdao, People's Republic of China