1. Mem. ASME George W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, 813 Ferst Drive, Rm. 211, Atlanta, GA 30332-0560 e-mail:
2. School of Mechanical Engineering, Donghua University, 2999 North Renmin Road, Songjiang District, Shanghai 201620, China e-mail:
3. Fellow ASME George W. Woodruff School of Mechanical Engineering, Georgia Institute of Technology, 813 Ferst Drive, Rm. 211, Atlanta, GA 30332-0560 e-mail: