An Improved Recommendation Algorithm in Collaborative Filtering. - Taek-Hun Kim; Young-Suk Ryu; Seok-In Park; Sung-Bong Yang (EC-Web, 2002)

An Effective Peer-to-Peer Web Caching System under Dynamic Participation of Peers. - Young-Suk Ryu; Sung-Bong Yang (IEICE Trans. Commun., 2005)