https://www.syu.ac.kr/blog/%ec%8b%9d%ed%92%88%ec%95%88%ec%a0%84%ec%a0%95%eb%b3%b4%ec%9b%90-%ec%a0%9c2%ec%b0%a8-%ea%b8%b0%ea%b0%84%ec%a0%9c-%ec%a7%81%ec%9b%90-%eb%aa%a8%ec%a7%91-%ea%b3%b5%ea%b3%a0/2020%eb%85%84-%ec%a0%9c2%ec%b0%a8-%ea%b8%b0%ea%b0%84%ec%a0%9c-%ea%b3%b5%ea%b0%9c%ec%b1%84%ec%9a%a9-%ea%b3%84%ed%9a%8d%eb%8f%85%ec%9d%bc%ec%96%b4-pdf_page_07/