1. Chanjuan Liu:
School of Mechanical Electronic and Information Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China; School of Information and Electrical Engineering, Ludong University, Yantai 264025, Shandong, China
2. Xu Qian:
School of Mechanical Electronic and Information Engineering, China University of Mining and Technology (Beijing), Beijing 100083, China
3. Caixia Li:
School of Information and Electrical Engineering, Ludong University, Yantai 264025, Shandong, China