A Micro-Electro-Mechanical system device includes a doped semiconductor layer that is disposed outwardly from a substrate. According to an image signal processing method of the present invention, an input video signal contains an image signal whose pixel size is converted at a specified magnification scale. The air fences are positioned at selected locations along the length of the fan blades, between the ends of the fan blades. In the bending hole region, a plurality of round holes are formed regularly. The layer can then be heated at a temperature that is greater than 550\xb0 C. To vary the actuating pressure, the valve device is acted upon by a control pressure in an area of active surfaces of at least a first and a second valve slides.