https://www.syu.ac.kr/blog/%ec%8a%a4%eb%af%b8%ec%8a%a4%ed%95%99%eb%b6%80%eb%8c%80%ed%95%992021-1-smith%ed%83%90%eb%b0%a9%eb%8c%80%e5%89%8dsmith-college4-0-%ea%b3%b5%eb%aa%a8%ec%a0%84/%ec%8a%a4%eb%af%b8%ec%8a%a4%ed%83%90%eb%b0%a9%eb%8c%80_%ea%b3%84%ed%9a%8d%ec%84%9c%ec%8b%a0%ec%b2%ad_%ec%84%9c%ec%8b%9d%ec%98%81%eb%ac%b8/