Abstract: A user device including a communication interface that communicates with a server, a sensor unit that detects at least one of a state of a user and a state of the user device, and a controller that controls an operating condition of the user device by receiving information from the server based on a comparison between an output of the sensor unit and stored setting description data associating the operating condition with a predetermined output of the sensor unit.

Abstract: A color-selecting apparatus of a color display device which can effectively suppress vibration generated in a color-selecting electrode system, wherein one side of a supporting plate spring is fixed to a frame via a holder, and the other side of the supporting plate spring is fixed to the frame. The supporting plate spring is constituted by laminating flat plate springs, and the flat plate springs relatively move by deformation accompanying the vibration from the outside. The vibrational energy is consumed by the frictional energy generated between them.

Abstract: A system for shaking water off a surface includes an electromagnetically operable driver unit for driving a member having the surface. The driver unit is connected to a control unit which controls oscillation frequency to be generated by the driver unit. The control unit adjusts the frequency of oscillation transmitted to the member for matching the oscillation frequency with the resonating frequency of the member for effectively shaking the water off the surface.