http://ko.wikipedia.org/wiki/IEEE_754
http://neoyeop.tistory.com/entry/IEEE-754-%EB%B6%80%EB%8F%99%EC%86%8C%EC%88%98%EC%A0%90%ED%91%9C%ED%98%84-%EB%B0%A9%EC%8B%9D
http://www.devpia.com/MAEUL/Contents/Detail.aspx?BoardID=51&MAEULNO=20&no=6206
