A power source device comprises a cell unit 12 comprising a plurality of cells 12a. The dryer further includes a chamber environment control system that supplies a gas into the chamber to dry the substrate and controls temperature and humidity in the chamber and a chamber heater attached to the chamber to transfer thermal energy into the chamber. The cooking device also comprises a means for stirring the contents of the cooking pot and scraping the inner surfaces of the cooking pot. The method may be performed by a Java applet running in a network environment.