1. 3) ANTEC 2004, Session M 25, T 22, W 10, T 3, Chicago, Illinois, May.(2004)
2. 4) Proc.of PPS-20, Foam Technology I, II, Akron, Ohio, June(. 2004)
3. 5) Foams'04, Wilmington, Delaware, Oct.(2004)
4. 6) http//service.jst.go.jp/jdream
5. 7) Kim, .K., Kang, S. L. and Kwak, H. Y. : Poly.Eng.Sci., 44(10), 1890 (2004)