https://purengom.com/2009/10/18/iphone%ec%9d%b4-%eb%82%98%ec%99%94%ec%9d%84%eb%95%8c-as%ec%97%90-%eb%8c%80%ed%95%9c-%ec%9a%b0%eb%a0%a4%ec%97%90-%eb%8c%80%ed%95%9c-%ec%83%9d%ea%b0%81/