1. College of Automation Engineering, Nanjing Univ. of Aeronautics and Astronautics, Nanjing 210016, P.R. China; and Research Fellow, Sonny Astani Dept. of Civil and Environmental Engineering, Univ. of Southern California, Los Angeles, CA 90089.
2. Professor, College of Automation Engineering, Nanjing Univ. of Aeronautics and Astronautics, Nanjing 210016, P.R. China (corresponding author).
3. Professor, College of Automation Engineering, Nanjing Univ. of Aeronautics and Astronautics, Nanjing 210016, P.R. China.
4. Master Student, College of Automation Engineering, Nanjing Univ. of Aeronautics and Astronautics, Nanjing 210016, P.R. China.