Theory of computation, automata theory, algorithm design, information retrieval, natural language processing, neural-symbolic model

2009 - Present: Professor, Department of Computer Science and Engineering, Yonsei University
2005 - 2009: Researcher, Korea Institute of Science and Technology

Steering Committee of Developments in Language Theory

Member of IFIP WG 1.2 Descriptional Complexity

Committee Member of Korea Informatics Olympiad

Conference Program Committee: CIAA, DLT, DCFS etc.