https://www.syu.ac.kr/blog/%ea%b8%b4%ea%b8%89%ec%a7%84%eb%8b%a8-%eb%8c%80%ed%95%99-%ec%83%9d%ec%a1%b4%ec%9c%84%ea%b8%b0-%ec%82%bc%ec%9c%a1%eb%8c%80%ec%9d%98-%eb%8c%80%ec%9d%91-%eb%b0%a9%ec%95%88%ec%9d%80/2020%eb%85%84-2%ec%9b%94-7%ec%9d%bc%ea%b8%88-%ea%b9%80%ec%9d%bc%eb%aa%a9-%ec%b4%9d%ec%9e%a5-%ec%b7%a8%ec%9e%84-%ec%9d%b8%ed%84%b0%eb%b7%b0-7-1/