Abstract:
PURPOSE: A system and a method for controlling volume of a music file are provided to automatically control a volume level of the music file constantly when a plurality of music files are continuously played. CONSTITUTION: A volume information detector(201) detects the volume information added to an area of the compressed music file if playback of the compressed music file is requested. A decoder(201) decodes the compressed music file in order to recover the compressed music file to an original state. A volume controller(203) controls the volume of an audio signal output from the decoder based on the detected volume information. If the compressed music files is a plural number, the volume information detector detects the volume information of each compressed music file.
Abstract:
PURPOSE: A non volatile single electron transistor memory is provided to secure a repeatability and a uniformity of an island by using a quantum dot for precisely controlling the size of the island to a unit of nanometer. CONSTITUTION: A non volatile single electron transistor memory comprises a silicon substrate(100), quantum dots(110) of a predetermined size, a source(120) and a drain(130), and a side gate. A SiO2 oxidation layer(100b) is formed on the silicon substrate. The quantum dots of a predetermined size are separated a predetermined interval from each other on the SiO2 oxidation layer. The source and drain are formed by evaporating a metal on the SiO2 oxidation layer including the quantum dots, having a predetermined number of the quantum dots used as an island, between the source and the drain. The side gate is formed on the SiO2 oxidation layer at a side surface of the source and drain, having a predetermined interval from the source and drain.