A study of the optimization method for distance education and evaluation of effectiveness: the case of S university in South Korea - Presenter: Cheolil Lim, Seoul National University; Presenter: Jaehyuk Yoo, Department of Education, College of Education, Seoul National University; Presenter: Eunseon Lim, KSET; Contributor: Honggyu Lee, Seoul National University; Presenter: Honey Kim, Seoul National University; Presenter: Sumin Hong, Seoul National University; Presenter: Dayeon Lee, Seoul National University; Contributor: JuHyeon Park, Seoul National University / KSET; Contributor: Jongchan Lee, Seoul National University