1. Ph.D. Candidate, Faculty of Infrastructure Engineering, Dalian Univ. of Technology, Ganjingzi District, Dalian, Liaoning 116024, China.
2. Professor, Dept. of Mechanical Engineering, Univ. of Houston, Houston, TX 77004 (corresponding author).
3. Professor, Faculty of Infrastructure Engineering, Dalian Univ. of Technology, Ganjingzi District, Dalian, Liaoning 116024, China.
4. Engineer, Guangdong Electrical Co., 8 Shuijinggang Rd., Guangzhou 510080, China.