A memory device includes a high speed port, a low speed port, at least a first memory bank, a first register, and a multiplexer. A three-dimensional image generator is provided that generates data on the virtual space image seen from a viewpoint indicated by the viewpoint position information and outputting a three dimensional image to the display. A controller increases a fuel supply amount to the combustor when the methanol supply amount to the vaporizer is increased. 5% by mass of non-polymer catechins; from 0. The lenses of the invention provide substantially constant distance vision power zone in the center of the optic zone surrounded by a zone that provides positive longitudinal spherical aberration. According to the invention, exo-1–3-piperidino-1-propanone can be obtained by reacting the exo-ether of enol silylene of formula with a compound of N-methylenepiperidinium.