https://blog.gongquiz.com/2021/08/27/%ec%9c%a0%ed%9a%a8%eb%82%99%ec%b0%a8-30m-%ec%b6%9c%eb%a0%a5-2000kw%ec%9d%98-%ec%88%98%ec%b0%a8%eb%b0%9c%ec%a0%84%ea%b8%b0%eb%a5%bc-%ec%a0%84%eb%b6%80%ed%95%98%eb%a1%9c-%ec%9a%b4%ec%a0%84%ed%95%98/