1. Department of Chemical Engineering, Sunchon National University, Sunchon, Jeonnam 540-742, Korea
2. Department of Polymer Engineering, Sunchon National University, Sunchon, Jeonnam 540-742, Korea
3. SFC. Co., Ltd., 342-42, Yesusandan 1-ro, Yeosu-si, Jeollanam-do, 550-280, South Korea