1. State Key Laboratory for Strength and Vibration of Mechanical Structures, School of Aerospace, Xi'an Jiaotong University, Xi'an 710049, China
2. College of Electrical and Information Engineering, Shaanxi University of Science and Technology, Xi'an 710021, China
3. Department of Physics, Lanzhou University of Technology, Lanzhou 730050, China
4. School of Information Technology, Jiangxi University of Finance and Economics, Nanchang, People's Republic of China
5. Key Laboratory of Biomedical Information Engineering of Education Ministry, Institute of Biomedical Engineering, Xi'an Jiaotong University, Xi'an 710049, China