An apparatus converts a digital value including a bits into an analog signal and has 2b DA converters. To ensure effective cooling a coolant inlet pipe discharges into each cooling chamber and the cooling chambers are each attached to a coolant outlet by means of an outlet opening. The step of processing the information of the first frame and the information of the second frame further comprises calculating a sigmaSAD value for the second frame, calculating a divisor value for the second frame, and calculating the quantization step for the second frame. The injection motor and the transmission shaft are disposed on the same axis, and the transmission shaft is advanced and retracted inside the rotor of the injection motor. The management center manages the digital cameras, using the identification information sent from the rental-item providing machine. The erodible matrix comprises binder and diluent which control the release of drug from the pharmaceutical composition.