1. School of Chemical and Biomedical Engineering, Nanyang Technological University, 62 Nanyang Drive, Singapore 637459, Singapore
2. Department of Energy Engineering, Hanyang University, Seoul 133-791, Korea
3. Center for Computational Science, Korea Institute of Science and Technology, Seoul 136-791, Korea
4. Virtual Lab Inc., Hwarangno 14-gil 5, Seongbuk-gu, Seoul 02792, Korea