1. Professor, Chongqing Jiaotong Univ., Nanan, Chongqing 400074, China.
2. Professor, Chongqing Jiaotong Univ., Nanan, Chongqing 400074, China; and Principal, East & West Engineering Technologies Inc., 107 Tetworth Way, Folsom, CA 95630.
3. Principal, Imbsen Consulting, P.O. Box 2516, Fair Oaks, CA 95628.