Acquaintances Clustering for Social Relationship-Based Indexing of Digital Photos. - Jonghak Kim; Taekwon Jang; Joonhyuk Yang; Jung-hee Ryu (HCIS, 2010)

AgeCAPTCHA: an Image-based CAPTCHA that Annotates Images of Human Faces with their Age Groups. - Jonghak Kim; Joonhyuk Yang; Kwangyun Wohn (KSII Trans. Internet Inf. Syst., 2014)

FaceCAPTCHA: a CAPTCHA that identifies the gender of face images unrecognized by existing gender classifiers. - Jonghak Kim; Sang-Tae Kim; Joonhyuk Yang; Jung-hee Ryu; Kwangyun Wohn (Multim. Tools Appl., 2014)