User-Class Based Service Acceptance Policy Using Cluster Analysis. - Hea-Sook Park; Yan Ha; Soon-Mi Lee; Young-Whan Park; Doo-Kwon Baik (ICDCIT, 2004)

Design and Implementation of SMS Security System for Wireless Environment. - Yan Ha; Hea-Sook Park; Soon-Mi Lee; Young-Whan Park; Youngshin Han (KES (2), 2005)

Class-based request control system in multimedia contents service. - Hea-Sook Park; Soon-Mi Lee; Doo-Kwon Baik (J. Syst. Archit., 2006)

Allocation of Classes in Distributed Object-Oriented Databases. - Soon-Mi Lee; Yan Ha; Hea-Sook Park (SNPD, 2009)