Disclosed is a priority control method using a single output queue wherein an output priority of a packet not undergoing convergence is improved by exchanging the order of a packet undergoing convergence or a packet which may undergo convergence with the order of a packet not undergoing convergence. After receiving a selected product, the product delivery cup is shifted toward a dispensing chamber causing the discharge element to engage with a discharge member mounted within the vending machine. The thickness of the barrier insulating film covering the fuse is larger than the thickness of the underlying barrier insulating film so as to improve the moisture resistance of the fuse. The first base tunnel insulating film is provided between the first base semiconductor layer and the first channel semiconductor layer.