1. Department of Chemical Engineering, Pukyong National University, 100 San Yongdang-Dong
Nam-Gu, Busan 608-739, South Korea
2. Department of Chemical Engineering, Kyung Hee University, 1732 Dugyoungeaero Gyhung-Gu Yonginsi Kyunggi 446-701, South Korea
3. Department of Chemical and Biological
Engineering, Dongguk University, 26 3-Ga
Pil-Dong Jung-Gu, Seoul 100-715, South Korea.