https://www.syu.ac.kr/blog/2021%eb%85%84-%ed%95%9c%ea%b5%ad%eb%b3%b4%ea%b1%b4%ec%9d%98%eb%a3%8c%ec%97%b0%ea%b5%ac%ec%9b%90-%ec%84%9c%ed%8f%ac%ed%84%b0%ec%a6%88-%eb%aa%a8%ec%a7%91/2-2021-neca-%ec%84%9c%ed%8f%ac%ed%84%b0%ec%a6%88-%ec%a7%80%ec%9b%90%ec%84%9c-%eb%b0%8f-%ea%b0%9c%ec%9d%b8%ec%a0%95%eb%b3%b4-%ec%88%98%ec%a7%91%ec%9d%b4%ec%9a%a9-%eb%8f%99%ec%9d%98%ec%84%9c/