Tai-Jong Kim Min-Cheol Kim Context Awareness Using Semantic Web Technology in the Ubiquitous Learning Service. 501-515 2008 ICCSA (1) http://dx.doi.org/10.1007/978-3-540-69839-5_37 conf/iccsa/2008-1 db/conf/iccsa/iccsa2008-1.html#KimK08