Abstract: The objective of the present invention is to provide a mattress including a plurality of cells provided on a body pressure working surface of a substrate that supports a human body, and a pressure control means that changes a setting of a height of each cell by adjusting a pressure in a fluid chamber formed within the cell. An elastic cushion layer is provided on a body pressure working surface of the cells, and a constricted portion is formed in a middle in the height of the each cell so that the body pressure working surface of the cell is allowed to tilt following deformation of the cushion layer as a result of the cells' precession-deformation at the constricted portion.

Abstract: A floating point calculation method according to the present invention includes steps of: receiving input data; performing calculation for data for an exponent portion of the input data for outputting a calculation result; branching into cases in accordance with the calculation result for setting a value of each bit of output data in accordance with a combination of a designation signal designating by which one of rounding up and rounding down the integer representation is to be performed and a sign bit of the input data; and outputting the output data.