1. Dept. of Chemical Engineering; Pohang University of Science and Technology; Pohang 790-784 Korea
2. School of Chemical Engineering; Yeungnam University; Gyeongsan 712-749 Korea
3. School of Biotechnolgy and Graduate School of Biochemistry; Yeungnam University; Gyeongsan 712-749 Korea
4. Dept. of Biological and Environmental Engineering; Semyung University; Jecheon 390-711 Korea