https://blog.gongquiz.com/2023/03/18/%eb%8b%a4%ec%9d%8c-%ea%b7%b8%eb%a6%bc%ec%97%90%ec%84%9c-%ec%8a%ac%eb%9f%bc%ed%94%84-%ec%bd%98slump-cone%ec%9d%98-%eb%86%92%ec%9d%b4%eb%8a%94-%ec%96%bc%eb%a7%88%ec%9d%b8%ea%b0%80-%ea%b1%b4/