https://www.syu.ac.kr/blog/2021%eb%85%84-%ec%83%9d%ed%99%9csoc-%ea%b3%b5%eb%aa%a8%ec%a0%84-%ea%b0%9c%ec%b5%9c/2021%eb%85%84-%ec%83%9d%ed%99%9csoc-%ea%b3%b5%eb%aa%a8%ec%a0%84-%ec%b0%b8%ea%b0%80%ec%8b%a0%ec%b2%ad%ec%84%9c-%eb%b0%8f-%ec%9d%91%eb%aa%a8%ec%84%9c%ec%8b%9d/