1. Department of Mechanical Engineering, Pohang University of Science and Technology (POSTECH), Pohang 790-784, Republic of Korea
2. Turbopump Department, Korea Aerospace Research Institute (KARI), Daejeon 305-806, Republic of Korea
3. Department of Extreme Energy Systems, Korea Institute of Machinery and Materials, Korea Institute of Machinery and Materials (KIMM), Daejeon 305-343, Republic of Korea