Ph.D.: Sept. 2011 - Feb. 2016, Ph.D. of computer engineering, Department of Computer Engineering, Kyung Hee University, South Korea. M.S.: Sept. 2009 - Aug. 2011, M.S. of computer engineering, Department of Computer Engineering, Kyung Hee University, South Korea. B.S.: Sept. 2005- Jul. 2009, organization of Computer Science and Technology, Harbin University of Science and Technology, China. Vistiting Scholar: Nov. 2016 - Oct. 2017, Department of Computer Science and Engineering, Michigan State University, Lansing, MI, US