https://blog.gongquiz.com/2022/01/13/%eb%8b%a4%ec%9d%8c-%ec%a4%91-%ec%9a%a9%ec%a0%91-%ec%a1%b0%ec%9d%b8%ed%8a%b8joint-%ed%98%95%ec%8b%9d%ec%97%90-%ec%86%8d%ed%95%98%ec%a7%80-%ec%95%8a%eb%8a%94-%ea%b2%83%ec%9d%80-%ed%95%ad%ea%b3%b5/