https://purengom.com/2008/11/27/kbs-%ec%8b%9c%ec%82%ac%ea%b5%90%ec%96%91-%ed%94%84%eb%a1%9c%ea%b7%b8%eb%9e%a8-%eb%8b%a4%ec%8b%9c%eb%b3%b4%ea%b8%b0-%ea%b4%91%ea%b3%a0-%eb%84%a3%ec%96%b4%ec%95%bc%ea%b2%a0%eb%82%98/