Park, Young-Jun; Bae, Hae-Young; Yoo, Ji-Uk; Chae, Myeong-Yun; Paek, Sang-Hyun; Min, Hye-Kyung; Park, Hyun-Gyu; Ryu, Choon-Ho; Kim, Kyung-Chul; Lee, Jeoung-Wook
Patent: US2002/169314 A1, 2002 ;