https://blog.gongquiz.com/2022/06/24/%ec%8a%88%ed%8f%ac%eb%8b%89-%ea%b5%ad%ec%a0%9c%ea%b1%b0%eb%9e%98%ec%86%8c-oft%ec%bd%94%ec%9d%b8-%ec%83%81%ec%9e%a5-%ec%97%85%eb%ac%b4%ed%98%91%ec%95%bd%ec%8b%9d-%ec%84%b1%eb%a3%8c-%d0%b9/