An attachment apparatus for disc protective sheet which is adapted for attaching disc protective sheet for protecting disc rotatably accommodated within a cartridge body formed by connecting or joining a pair of upper and lower halves with respect to the surface opposite to the disc of the half. The time intervals Tp are those in which a number of blocks of information per unit time is greater than a baseline value. A gate dielectric layer is formed on the top surface of the semiconductor body and on the sidewalls of the semiconductor body. The method may further include sending, by the first femto base station via the femto base station air interface, a first femto base station preamble, the first femto base station preamble being sent at a time determined at least in part by the resource allocation message. The method further includes determining a combined boundary for PET scatter correction. The subtractor includes two NPN transistors connected to the p-channel bandgap reference unit, and two PNP transistors connected to the n-channel bandgap reference unit.