An Environmental Monitoring System for Managing Spatiotemporal Sensor Data over Sensor Networks. - SuWook Ha; Yang Koo Lee; Vu Thi Hong Nhan; Young Jin Jung; Keun Ho Ryu (Sensors, 2012)

An algorithm for finding frequent patterns in social media stream. - SuWook Ha; Yongmi Lee; Kwang Woo Nam; Keun Ho Ryu (ICTC, 2013)