Institution: | 1.Kongju National University, 1223-24 Cheonan-daero, Seobuk-gu, Cheonan, Chungnam, 331-717, South Korea ;2.Ecomaister Co., Ltd., 117 Jeongseojinro, Seo-gu, Incheon, 404-250, South Korea ;3.Research Institute of Industrial Sciences, Cheongju University, 298 Daesung-ro, Naeduck-dong, Cheongju, South Korea ; |