1. CSIRO Petroleum Resources, 26 Dick Perry Avenue, Kensington, Perth, WA 6151, Australia
2. Clean Fossil Energy Research Center, Korea Institute of Energy Research, 102 Gajeongro, Yuseong-gu, Daejeon 305-343, Republic of Korea
3. Department of Environmental Engineering, Kyoungpook National University, 1370 Sankyuk-dong, Daegu 702-701, Republic of Korea