1. Department of Chemical & Biological Engineering, Korea University, Seoul 136-701, Korea
2. Korea Atomic Energy Research Institute, 150 Deokjin-dong, Yuseong-gu, Daejeon
305-353, Korea
3. Agency for Defense Development, 111 Sunam-dong, Yuseong-gu, Daejeon 305-152,
Korea
4. Department of Chemistry, Korea University, Seoul 136-701, Korea