1. School of Mechanical and Automotive Engineering, Inje University, 607 Obang-dong, Gimhae, Gyongnam 621-749 Korea
2. Samsung Electronics Co., Ltd., 416, Maetan3-dong, Paldal-gu, Suwon, Gyeonggi-do 442-742, Korea
3. Donald Schultz Professor of Turbomachinery, Director, Thermo-Fluids Laboratory, Department of Engineering Science, Oxford University, Parks Road, Oxford OX1 3PJ, United Kingdom