1. Ph.D. Candidate, Institute of Engineering Science and Technology, Kaohsiung, 811 Taiwan.
2. Professor, Dept. of Safety Health and Environmental Engineering, National Kaohsiung First Univ. of Science and Technology, Kaohsiung, 811 Taiwan.
3. Professor, Dept. of Chemical and Biomolecular Engineering, Univ. of Pennsylvania, Philadelphia, PA 19104-6393 (corresponding author).