The mobile station for transceiving signals using a predetermined time division duplex frame structure in a wireless communication system includes a receiver for receiving a midamble from a base station, and a relay station. This ensures that supply ventilation is activated only when it is beneficial for the drying of the attic and controls the ventilation so that an acceptable moisture level is ensured with a minimal ventilation rate, resulting in a warmer attic and reduced heat loss during the heating season. A first control gate electrode is separated from a second control gate electrode by an air gap located between the major surfaces of the first and second control gate electrodes andor the charge storage region includes silicide nanoparticles embedded in a charge storage dielectric.