Choong-Kil Seo is a professor at the Department of Automotive & Mechanical Engineering at Howon University at Gunsan city, Jeollabuk-do, Republic of South Korea. The major is combustion and post-exhaust treatment engineering, renewable energy. In particular, I have devoted to catalytic research and development, which is an exhaust gas abatement device for vehicles and machinery, and have contributed to practical use of de-NOx catalysts(Lean NOx Trap, Selective Catalytic Reduction, and Natural Gas Oxidation Catalyst). I received a Ph. D. degree in the Department of Mechanical Engineering from Chonnam National University at Gwangju city in February 2012. I have been working on the environmentally friendly diesel hybrid research center of Korea Automotive Technology Institute (KATECH) under the Ministry of Tread, Industry and Energy, and mainly developed the catalysts for vehicles and sensors.