On learnability and naturalness as constraints on phonological grammar. - Hahn Koo; Jennifer Cole 001 (ExLing, 2006)

Incremental learning of MAP context-dependent edit operations for spoken phone number recognition in an embedded platform. - Hahn Koo; Yan Ming Cheng (INTERSPEECH, 2006)

An unsupervised method for identifying loanwords in Korean. - Hahn Koo (Lang. Resour. Evaluation, 2015)