1. Department of Mechanical and Civil Engineering, College of Engineering and Science, Florida Institute of Technology, Melbourne, FL 32901 USA (e-mail: wgao@fit.edu)
2. Department of Civil, Environmental and Construction Engineering (Major in Transportation Engineering), University of Central Florida, Orlando, FL 32816 USA.
3. Department of Computer Engineering, Missouri University of Science and Technology (Missouri S&T), Rolla, MO 65409 USA.
4. Department of Electrical and Computer Engineering, Tandon School of Engineering, New York University, Brooklyn, NY 11201 USA.