1. Department of Chemical Engineering, Changwon National University, 9 Sarim-dong, Changwon, Gyeongnam 641-773, Republic of Korea, Green Technology Center, Korea Institute of Industrial Technology, 421 Daun-dong, Jung-gu, Ulsan 681-802, Republic of Korea, and R&D Center, Yoo Sung Co., LTD, 248 Dangwol-ri, Onsan-eup, Ulju-gun, Ulsan 689-892, Republic of Korea