A cooling system cools air that flows through an electronic system to cool heat generating components. The heat-generating body of the invention for warming a foot is characterized in that it contains a heat-generating formed article causing a heat-generating reaction in the presence of air and having a shape retaining degree of 70 or more charged in a container bag constituted with a base material, a covering material and the like. In a plane below the permanent magnet 16 at least three first lateral Hall sensors 40a-c are located in a circular path 50. The semiconductor chip is caused to perform a test pattern during the application of external stimulus to each of the fractional portions to determine if a soft defect exists in any of the series of fractional portions. These local limitations make the tiling adaptive.