Kangweon-Kyunggi Mathematics Conference. "A general population model with ecological application.” Kyunghee University, Korea, June 20, 2025.
Michigan Academy of Science, Arts and Letters. “A general predator-prey model with ecological application.” Virtual, February 28, 2025.
Celebration of Research. “A predator-prey biological model with combined birth rates, self-limitation, and competition terms.” Andrews University, Berrien Springs, MI, October 25, 2024.
Michigan Academy of Science, Arts and Letters. Noelle Koliadko (with Joon Hyuk Kang). "A general predator-prey model with combined growth terms." Lawrence Technnological University, Southfield, MI, March 8, 2024.
Kangwon-Kyunggi Mathematics Conference. "Existence, estimate of positive solutions with uniqueness for a general elliptic system with application." Gangneung-Wonju University, Gangneung, South Korea, June 16, 2023.
Michigan Academy of Science, Arts and Letters. "Existence, estimate of positive solutions with uniqueness for a general elliptic system with application." Andrews University, Berrien Springs, MI, March 17, 2023.
Michigan Academy of Science, Arts and Letters. Noelle Koliadko (with Joon Hyuk Kang). "Existence and nonexistence for a general elliptic system with application." Andrews University, Berrien Springs, MI, March 17, 2023.
Michigan Academy of Science, Arts and Letters Conference, "Existence, estimate of positive solutions with uniqueness." Virtual, March 11, 2022.
Joint Mathematics Meetings. "Uniqueness pattern of survival of two species of animals in a domain." Denver, CO, January 16, 2020.
2. Celebration of Research at Andrews University, poster presentation. “Positive solutions to a developed mathematical model.” Andrews University, Berrien Springs, MI, October 25, 2019.
US-Korea Conference of the Korean-American Scientists & Engineers Association (KSEA). “An elliptic nonlinear system of two functions with application.” Chicago, IL, August 16, 2019.
CMS-HMS Joint Conference. “Positive solution of an elliptic system with perturbed growth rates.” Korea National University of Education, Cheongju, Korea, June 14, 2019.
Michigan Academy of Science, Arts, & Letters Conference, Sun, Q., poster presenter, with Kang, J. H. “A predator-prey biological model with combined birth rates and self-limitation.” Alma College, Alma, MI, March 1, 2019.
Michigan Academy of Science, Arts, & Letters Conference, Ford, L., presenter, with Kang, J. H. “Positive solutions to a general predator-prey system with combined self-limitation and competition. Alma College, Alma, MI, March 1, 2019.
Michigan Academy of Science, Arts, & Letters Conference. “Perturbation of nonlinear elliptic biological interacting model.” Alma College, Alma, MI, March 1, 2019.
KKMS-CCMS Joint Conference and Annual Meeting. “A general elliptic nonlinear system of two functions with application.” Daejin University, South Korea, June 15, 2018.
Michigan Academy of Science, Arts and Letters Conference, “Perturbation of a nonlinear elliptic mathematical model.” Central Michigan University, Mt. Pleasant, MI, March 9, 2018.
KKMS-CCMS Joint Conference & Annual Meeting. “Positive solutions to a general nonlinear second-order system with applications.” Dankook University, Cheon-An, South Korea, June 9, 2017.
Michigan Academy of Science, Arts & Letters Conference. “Estimate of positive solutions with uniqueness.” Western Michigan University, March 10, 2017, copresentation with T. Robertson.
Joint Mathematics Meetings. Robertson, T., presenter, , with Kang, J. H. "Coexistent conditions for nonlinear reaction-diffusion population models." Atlanta, GA, January 5, 2017.
Mathematical Association of America. "A general elliptic nonlinear system of two functions with application." Hillsdale College, Hillsdale, MI, April 1, 2016.
Michigan Academy of Sciences, Arts & Letters Conference, Mathematics Section, Robertson, T., presenter, with Kang, J. H. "A general elliptic nonlinear system of two functions with application." Saginaw Valley State University, Saginaw, MI, March 4, 2016.
Joint Mathematics Meetings, Robertson, T., presenter, with Kang, J. H. "Conditions for positive solutions of the general elliptic model," Seattle, WA, January 14, 2016.
Michigan Academy of Science, Arts & Letters Conference. “Equivalent mathematical conditions for survivals of species of animals for the most general population models.” Andrews University, Berrien Springs, MI. March 13, 2015.
Michigan Academy of Science, Arts & Letters Conference, Mathematics Section.“Sufficient and necessary conditions for existence of positive solutions for a general elliptic model.” Oakland University, Rochester, MI, February 28, 2014.
Joint Mathematics Meetings. “Coexistence condition of two species of animals residing in an environment.” Baltimore, MD, January 17, 2014.
Annual Conference of the Michigan Academy of Science, Arts, and Letters, "Steady State Solutions to General Population Models.” Hope College, Holland, Michigan, March 22, 2013.
Annual meeting of the American Mathematical Society, Joint Mathematics Meetings, "Steady State Solutions to General Population Models." San Diego, California, January 10, 2013.
Poster, Fourth Annual Celebration of Research, "Coexistence State in Species of Animals Residing in the Same Community." Andrews University, November 8, 2012.
Poster, Third Annual Celebration of Research, "Coexistence State in Species of Animals Residing in the Same Environment." Andrews University, November 10, 2011.
Math Fest, Mathematical Association of America, "Positive Steady State Solutions to Population Models", Portland, Oregon, August 8, 2009.
Eigen Talk, "Plugging into Partial Differential Equations", Department of Mathematics, Andrews University, October 10, 2003.
AMS Sectional Meeting, "The Existence and Uniqueness of General Competition Model", Ann Arbor, Michigan, March 1, 2002.
Colloquium, "Coexistence of Two Competing Species of Animals", Department of Mathematics, Andrews University, February 15, 2002.
Partial Differential Equations Seminar, "Non-uniqueness of Lotka-Voltera model", Department of Mathematics, Michigan State University, April 1, 1996.
Partial Differential Equations Seminar, "Uniqueness and Non-uniqueness of coexistence states in the Lotka-Voltera model", Department of Mathematics, Michigan State University, March 25, 1996.
Partial Differential Equations Seminar, "Lower bound of elliptic inequality", Department of Mathematics, Michigan State University, October 30, 1995.
