I work at the intersection of natural language processing (NLP) and information retrieval (IR), and I am interested in NLP (dialogue system etc), IR (cross-language IR etc), text mining (text classification/summarization etc), opinion mining (comparison mining, sentiment classification etc), big data (topic modeling and machine learning etc) and UI/UX. Recently, I'm interested in how to apply topic modeling and deep learning techniques to my research areas. I'm leading the Natural Language Processing (NLP) Laboratory at College of Computing of Sungkyunkwan University.