1. Department of Chemical Engineering, National Kaohsiung University of Applied Sciences, No. 415, Chien-Kung Road, Kaohsiung 807, Taiwan, Department of Environmental Engineering and Science, Chia-Nan University of Pharmacy and Science, Tainan, 717, Taiwan, and Department of Health Care Administration, Chung-Hwa College of Medical Technology, Tainan, 717, Taiwan