*Exploring Dynamics of HIV Infections: An Analysis of the Susceptible-Infected-Virus Model in Deterministic and Stochastic Forms,* the US-Korea Conference 2023 in Dallas, TX, August 2 ~ 5, 2023

*Computational and Mathematical Approaches to a Modified SEIR Model for COVID-19,* the US-Korea Conference 2022 in Arlington, VA, August 17 ~ 20, 2022

*Solutions of the Model of HIV-1 Dynamics,* invited talk, the US-Korea Conference 2020 – virtual, December 14 ~ 17, 2020

*Solutions of the HIV Model,* invited talk, the US-Korea Conference 2019 in Chicago, IL, August 14 ~ 17, 2019

*A Domain Decomposition Algorithm for Random PDE Optimization Problems,* invited talk, the US-Korea Conference 2018 in Queens, NY, August 1 ~ 4, 2018

*Error Estimates for DDM Solutions to Stochastic Optimal Control Problems,* invited talk, the US-Korea Conference 2017 in Washington D.C., August 9 ~ 12, 2017

*DDM for SPDEs,* contributed talk, Joint Mathematics Meetings, Atlanta, GA, January 5, 2017

*Exponential convergence for stochastic optimal control problems*, contributed talk, Joint Mathematics Meetings, Seattle, WA, January 8, 2016

*Optimal Control Problems for SPDEs with Neumann Conditions*, invited talk, the US-Korea Conference 2015 in Atlanta, GA, July 29 ~ August 1, 2015

*A non-overlapping DDM for the numerical solution of stochastic elliptic PDEs,* invited talk, Mathematics Colloquium, Department of Mathematics, Sogang University, Seoul, Korea, December 5, 2014

* The h $latex \times $ p FEM for Optimal Control Problems Constrained by Stochastic Elliptic PDEs*, invited talk, CSE Seminar, Department of Computational Science and Engineering, Yonsei University, Seoul, Korea, November 5, 2014

*Stochastic PDEs: Uncertainty, Representation, and Expansions,* invited talk, CSE Seminar, Department of Computational Science and Engineering, Yonsei University, Seoul, Korea, October 10, 2014

*An Optimization Based Domain Decomposition Method for PDEs with Random Inputs*, contributed talk, Joint Mathematics Meetings, Baltimore, MD, January 17, 2014

*Domain Decomposition Methods for Solving Stochastic PDEs*, invited talk, the US-Korea Conference 2013 in East Rutherford, NJ, August 7 ~ 11, 2013

*Discretization of Stochastic Optimal Control Problems by the h $latex \times $ p Version of the Stochastic Galerkin FEM*, invited talk, the Spring Central Sectional Meeting of the American Mathematical Society at Iowa State University in Ames, IA, April 26 ~ 28, 2013

*Distributed Optimal Control Problems for SPDE by the h $latex \times $ p Version of the SGFEM*, invited talk, BK21 Lecture, Department of Mathematics, Ajou University, Kyonggi-do, Korea, December 21, 2012

*The h-p Version of Stochastic Galerkin FEM for Stochastic Optimal Control Problems*, invited poster presentation, the US-Korea Conference 2012 in Los Angeles, CA, August 8 ~ 11, 2012

*A Stochastic Galerkin Method for Stochastic Control Problems*, invited talk, SIAM Conference on Uncertainty Quantification, Raleigh, NC, April 2, 2012

*Galerkin Finite Element Approximations of an Optimal Control Problem for Elliptic PDEs with Random Input Data*, contributed talk, Joint Mathematics Meetings, Boston, MA, January 6, 2012

*A Stochastic Galerkin FEM of an Optimal Control Problem for Stochastic PDE*, invited talk, BK21 Lecture, Department of Mathematics, Ajou University, Kyonggi-do, Korea, December 27, 2011

* Stochastic Galerkin Methods for Stochastic Problems*, invited talk, US-Korea Conference on Science, Technology, and Entrepreneurship, Park City, UT, August 10 ~ 14, 2011

*Finite Element Approximations of Stochastic Optimal Control Problems Constrained by Stochastic Elliptic PDEs*, contributed talk, Joint Mathematics Meetings, New Orleans, LA, January 7, 2011

*Stochastic PDE: Analysis and Optimization,* invited talk, Mathematics Colloquium, National Institute for Mathematical Sciences (NIMS), Daejeon, Korea, December 23, 2010

*Stochastic PDE Lecture Series*, invited lectures, Department of Mathematics, Ajou University, Kyonggi-do, Korea, December 15 ~ 20, 2010

- Lecture 1:
*Stochastic PDE: Uncertainty* - Lecture 2:
*Stochastic PDE: Representation* - Lecture 3:
*Stochastic PDE: Expansions* - Lecture 4:
*Stochastic PDE: Analysis* - Lecture 5:
*Stochastic PDE: Optimization* - Lecture 6:
*Stochastic PDE: Computation*

*Mathematical Analysis of Models,* invited talk, US-Korea Conference on Science, Technology, and Entrepreneurship, Seattle, WA, August 11 ~ 15, 2010

*On Solving a Boundary Control Problem Using the Domain Decomposition Method,* poster presentation, US-Korea Conference on Science, Technology, and Entrepreneurship, Seattle, WA, August 11 ~ 15, 2010

*Detection of DNA Mut-iGEM-s through the Use of a 2-Color Fluorescent System,* Co-Speaker, 2010 GCAT Synthetic Biology Workshop, Davidson College, Davidson, NC, July 8 ~ 10, 2010

*How to Analyze Real-World Problems?,* invited talk, Mathematics Seminar, Department of Mathematics, Sogang University, Seoul, Korea, December 23, 2009

*How to Analyze Real-World Problems?,* invited talk, BK21 Lecture, Department of Mathematics, Ajou University, Kyonggi-do, Korea, December 22, 2009

*How to Analyze Real-World Problems?,* invited talk, Computational Science and Engineering Workshop, Yonsei University, Seoul, Korea, December 18, 2009

*Error Estimates of Stochastic Optimal Neumann Boundary Control Problems,* invited talk, Joint Meeting of the Korean Mathematical Society and the American Mathematical Society, Ewha Womans University, Seoul, Korea, December 16 ~ 20, 2009

*Solving Stochastic Control Problems by the Finite Element Method,* invited talk, US-Korea Conference on Science, Technology, and Entrepreneurship, Raleigh, NC, July 16 ~ 19, 2009

*Finite Element Approximations of Optimal Neumann Boundary Control Problems Constrained by Stochastic Elliptic PDE,* invited talk, Applied Mathematics Seminar, Department of Mathematical Sciences, University of Delaware, Newark, DE, April 14, 2009

*On Solving Real-Life Problems,* invited talk, Department of Mathematics, UMW, October 8, 2008