1. Ph.D. Candidate, School of Chemical and Biological Engineering, Institute of Chemical Processes, Seoul National Univ., 1 Gwanak-ro, Gwanak-gu, Seoul 151-744, Republic of Korea.
2. Professor, Dept. of Chemical and Biological Engineering, Korea National Univ. of Transportation, 50 Daehak-ro, Chungju-si, Chungbuk 380-720, Republic of Korea.
3. Executive Director, Samchully Co., Ltd., 42 Gukjegeumyung-ro 6-gil, Yeongdeungpo-gu, Seoul 150-885, Republic of Korea.
4. Associate Professor, School of Chemical and Biological Engineering, Institute of Chemical Processes, Seoul National Univ., 1 Gwanak-ro, Gwanak-gu, Seoul 151-744, Republic of Korea (corresponding author).