Spatial Selectivity Estimation Using Compressed Histogram Information. - Jeong Hee Chi; Sang Ho Kim; Keun Ho Ryu (APWeb, 2005)

A New Continuous Nearest Neighbor Technique for Query Processing on Mobile Environments. - Jeong Hee Chi; Sang Ho Kim; Keun Ho Ryu (ICCSA (2), 2005)

Discovery of Spatiotemporal Patterns in Mobile Environment. - Vu Thi Hong Nhan; Jeong Hee Chi; Keun Ho Ryu (APWeb, 2006)

Estimating Selectivity for Current Query of Moving Objects Using Index-Based Histogram. - Jeong Hee Chi; Sang Ho Kim (ICIC (2), 2007)