Affiliation: | 1. Department of Mechanical Engineering, Northwestern University 2145 Sheridan Road Evanston, IL 60208-3111, U.S.A.;2. School of Civil & Environmental Engineering, Yonsei University 134 Shinchon-Dong, Seodaemoon-Ku Seoul 120-749, Korea;3. Department of Mechanical Engineering, Northwestern University 2145 Sheridan Road Evanston, IL 60208-3111, U.S.A. |