https://purengom.com/2011/04/19/%eb%b8%94%eb%9e%99%eb%b2%a0%eb%a6%ac-%eb%b3%bc%eb%93%9c-9700%ec%9d%98-os6-%eb%b8%8c%eb%9d%bc%ec%9a%b0%ec%a0%80-%eb%ac%b8%ec%a0%9c%ec%97%90-%ea%b4%80%ed%95%98%ec%97%ac/