https://www.syu.ac.kr/grad/5%ec%9b%94-4%ec%9d%bc-%ec%9d%b4%ed%9b%84-%eb%8c%80%eb%a9%b4-%ec%88%98%ec%97%85-%ea%b4%80%eb%a0%a8-%ec%95%88%eb%82%b4%ec%97%85%eb%8d%b0%ec%9d%b4%ed%8a%b8/5%ec%9b%94-4%ec%9d%bc-%ec%9d%b4%ed%9b%84-%eb%8c%80%eb%a9%b4-%ec%88%98%ec%97%85-%ea%b4%80%eb%a0%a8-%ec%95%88%eb%82%b4-2020-4-26/