1. Clean Fuel Department, High Efficiency and Clean Energy Research Division, Korea Institute of Energy Research (KIER), 71-2, Jang-dong,
Yuseong, Daejeon 305-343, Republic of Korea
2. Department of Chemical
Engineering, Kwangwoon University, 447-1, Wolgye-dong, Nowon-gu, Seoul 139-701, Republic of Korea