A semiconductor device may have an insulating layer comprising a silicon oxide film or the like formed so as to cover an entire upper surface of a semiconductor substrate. The urea condensation compositions are produced by heating urea or heating urea to produce isocyanic acid andor cyanic acid which reacts with urea to form urea condensates. The ride-on vehicle further includes one or more steerable wheels and one or more driven wheels. The power supplied from the commercial power supply to the fusing device is then limited to a limit level corresponding to the control result. Methods of assembly and use are also described.