https://www.syu.ac.kr/blog/%e3%80%8e%eb%82%b4%ec%9d%bc%ec%9d%80-%ec%9e%87it%eb%8b%a4%e3%80%8f%ec%82%ac%ec%97%85-%ec%b2%ad%eb%85%84-%ec%b0%b8%ec%97%ac%ec%9e%90-%eb%aa%a8%ec%a7%91-%ea%b3%b5%ea%b3%a0/%ea%b0%9c%ec%9d%b8%ec%a0%95%eb%b3%b4%ec%a0%9c%ea%b3%b5%eb%8f%99%ec%9d%98%ec%84%9c%eb%82%b4%ec%9d%bc%ec%9d%80-%ec%9e%87%eb%8b%a4/