https://www.syu.ac.kr/comp/2020%eb%85%84%eb%8f%84-%ec%9d%b4%ea%b3%b5%ea%b3%84-%eb%8c%80%ed%95%99%ec%83%9d-%ea%b2%bd%ec%a7%84%eb%8c%80%ed%9a%8c-%ec%a7%80%ec%9b%90%ec%82%ac%ec%97%85-%ea%b0%9c%ec%b5%9c%ea%b3%b5%ea%b3%a0-2/