1. Associate Professor, School of Electrical Engineering and Automation, Jiangsu Normal Univ., Xuzhou 221116, China; and Dept. of Information Science and Engineering, Chongqing Jiaotong Univ., Chongqing 400074, China (corresponding author).
2. Professor, Dept. of Information Science and Engineering, Chongqing Jiaotong Univ., Chongqing 400074, China.
3. Graduate Student, Dept. of Information Science and Engineering, Chongqing Jiaotong Univ., Chongqing 400074, China.
4. Associate Professor, Dept. of Information Science and Engineering, Chongqing Jiaotong Univ., Chongqing 400074, China.
5. Professor, Dept. of Civil Engineering, Chongqing Jiaotong Univ., Chongqing 400074, China.