International Conference Presentations
 D.G. Choi, S.Y. Park, J.C. Hong (2014 Nov.) “Quantitatively Exploring the Future of RPS in the Korean Electricity Sector via an Energy Model” INFORMS 2014 Annual Meeting, San Francisco, CA. U.S.A.
 D.G. Choi, M. Park, S. Lee, J-G Na, (2014 June) “Techno-economic analysis of hydrogen production from steel mill off-gases via microbial water-gas-shift reaction” 20th World Hydrogen Energy Conference 2014, Gwang Ju. Korea
 D.G. Choi, S.Y. Park, J.C. Hong (2014 June) “Quantitatively exploring the future of renewable portfolio standard in the Korean electricity sector via TIMES model” 65th Semi-annual IEA ETSAP meeting 2014, Beijing. China
 D.G. Choi, F. Kreikebaum, V. M. Thomas, Deepak Divan (2013 June) “Effect of Coordinated Electric Vehicle Adoption on the Energy System” 7th International Society of Industrial Ecology Biennial Conference 2013, Ulsan. Korea
 D.G. Choi, F. Kreikebaum, V. M. Thomas, Deepak Divan (2012 Oct.) “Effects of Electric Vehicles Adoption Pathway on the US Energy System” INFORMS 2012 Annual Meeting, Phoenix, AZ. U.S.A.
 D.G. Choi, F. Kreikebaum, V. M. Thomas, Deepak Divan (2012 Feb.) “Effects of the Convergence of the Smart Grid, Electric Vehicles and Renewable Generation on Total Carbon Emissions and Cost” 2012 Georgia Tech Research and Innovation Conference, Atlanta, GA. U.S.A.
 D.G. Choi and V. M. Thomas (2011 Nov.) An Electricity Generation Planning Model for Evaluation of Energy Policy Options, INFORMS 2011 Annual Meeting, Charlotte, NC. U.S.A.
 D.G. Choi and V. M. Thomas (2010 Nov.) Investment Planning for Electricity Generation Expansion Under CO2 Emission Reduction Policy, INFORMS 2010 Annual Meeting, Austin, TX. U.S.A.
 Poster session, D.G. Choi, D. Luo, Z. Hu, V. M. Thomas, M. J. Realff, R. R. Chance (2010 Sept.) Lifecycle Energy and Greenhouse Gas Emissions for an Ethanol Production Process based on Blue-green Algae, SWCS Sustainable Feedstocks for Advanced Biofuels workshop, Atlanta, GA. U.S.A.
 Poster session,(2008, Oct.) 2008 Chevron/Georgia Tech Fall Review, Georgia Tech, Atlanta, GA. U.S.A.
 Poster session,(2008, May) 2008 Chevron/Georgia Tech Spring Review, Georgia Tech, Atlanta, GA. U.S.A.
 Poster session,(2005 Nov.) 2005 Fall Conference of Korea Institute of Industrial Engineers (KIIE), Seoul. Korea
Domestic Conference Presentations
 “Bottom-up optimization energy system model for electricity sector, part 2”, Integration of Top-down and Bottom-up GHG model Project Seminar, Department of Business Administration, Kyungsung University, Busan, Korea. July. 2015
 “Bottom-up optimization energy system model for electricity sector, part 1”, Integration of Top-down and Bottom-up GHG model Project Seminar, Greenhouse Gas Inventory & Research Center of Korea, Seoul, Korea. May. 2015
 “Introduction of research on bottom-up energy system model in KIER: a transformation from MARKAL to TIMES”, Integration of Top-down and Bottom-up GHG model Project Seminar, Korea Environment Institute, Seoul, Korea. Oct. 2014
 “Introduction of research on energy system models and its expansion” Business School Seminar, Division of Business Administration, Hanyang University (ERICA), Ansan, Korea. Oct. 2014
 “Energy models for the national energy system and their expansion into industry” ISGST in Semiconductor and Display Industry, Korea University, Seoul, Korea. June 2013
 “Introduction of Energy Models” IE Graduate Student Seminar, Department of Industrial Engineering, Hanyang University, Seoul, Korea. May 2013