1. Graduate Student, Aerospace Engineering, Korean Advanced Institute of Science and Technology, 373-1 Kusong-dong, Yusong-gu, Daejeon 305-701, Korea. E-mail: kschang76@kaist.ac.kr
2. Assistant Professor, Civil and Environmental Engineering, IIHR-Hydroscience and Engineering, The Univ. of Iowa, Stanley Hydraulics Laboratory, Iowa City, IA 52242 (corresponding author). E-mail: sconstan@engineering.uiowa.edu
3. Professor, Aerospace Engineering, Korean Advanced Institute of Science and Technology, 373-1 Kusong-dong, Yusong-gu, Daejeon 305-701, Korea. E-mail: sopark@kaist.ac.kr