https://www-riss-kr.libproxy.changwon.ac.kr/search/detail/DetailView.do?p_mat_type=be54d9b8bc7cdb09&control_no=1b04e765fb1cd5edffe0bdc3ef48d419
finding . . .
https://www.youtube.com/watch?v=Q3340EPaTu8&t=275s