1. Aerodynamics Team, Aeronautics Technology Division; Korea Aerospace Research Institute; 115 Gwahangno, Yuseong-gu, Daejeon 305-333 South Korea
2. School of Mechanical and Aerospace Engineering; Seoul National University; San 56-1, Shinlim-dong, Gwanak-gu, Seoul 151-742 South Korea
3. School of Mechanical and Aerospace Engineering/Institute of Advanced, Aerospace Technology; Seoul National University; San 56-1, Shinlim-dong, Gwanak-gu, Seoul 151-742 South Korea
4. Department of Mechanical Engineering; Hanyang University; 1271 Sa 1 Dong, Ansan 425-791, KyungKi-Do South Korea