A computational device maintains a first type of cache and a second type of cache. A nitrogen atmosphere may be created and maintained in a reaction chamber by supplying a nitrogen source gas. A linear top edge of a second arm cover is affixed to the base sheet at an angle with respect to the top lengthwise edge of the base sheet. According to the method of producing the resinous hollow package of the invention, by carrying out insert-molding while fixing the moisture-proof island with projection disposed to the mold to prevent displacement thereof, the resinous hollow package having the maximum wave height of the semiconductor element mounting surface of 35 \u03bcm or less can be provided. A spatial high-frequency components estimation and scale up procedure is applied to the decoded signal of the lower coding layer to generate a high-frequency components signal. The first and second electrodes are received in the first and second electrodes, respectively.