Web robot detection based on pattern-matching technique. - Shinil Kwon; Young-Gab Kim; Sung Deok Cha (J. Inf. Sci., 2012)

A Paradigm Shift for the CAPTCHA Race: Adding Uncertainty to the Process. - Shinil Kwon; Sung Deok Cha (IEEE Softw., 2016)

CAPTCHA-based image annotation. - Shinil Kwon; Sung Deok Cha (Inf. Process. Lett., 2017)