Affiliation: | aDivision of Computer Science, KAIST, 373-1 Guseong-dong Yuseong-gu, Daejeon 305-701, South Korea bLORIA (INRIA Lorraine), 615, rue du Jardin Botanique, B.P. 101, 54602 Villers-les-Nancy, France cSchool of Computing, Soongsil University, Seoul, South Korea |