I am currently an assistant professor at the department of Mathematics, Keimyung University. I've spent two year at the Institute of Applied Mathematics, Inha University as a post-doctoral fellow. I've got my Ph.D. in mathematics at the University of New Mexico, with the dissertation: Commutators and dyadic Paraproducts on weighted Lebesgue spaces, July 2010, under supervision of Professor Maria Cristina Pereyra. Also, I've done my M.S. and B.S. at the Chung-Ang University.