Abstract: An information processing system includes: an information terminal; a first management device; and a control device. The information terminal receives a server certificate from the first management device. The control device includes: a storage in which a root certificate including a second public key is stored; a communicator that receives the server certificate from the information terminal; and a controller that verifies a signature included in the server certificate received, using the second public key included in the root certificate stored in the storage, and lifts the restriction imposed by a first device when the signature is successfully verified.

Abstract: In a fuel pressure control device for an internal combustion engine of the invention, a first map (FIG. 4A) for defining a first target fuel pressure for normal time and a second map (FIG. 5A) for defining a second target fuel pressure for suppressing noise and vibration smaller than the first target fuel pressure are stored. When an acquired fuel temperature is higher than a predetermined temperature, the first target fuel pressure defined in the first map is set as a target fuel pressure (steps 1 to 3), and when the fuel temperature is equal to or lower than the predetermined temperature, the second target fuel pressure defined in the second map is set as the target fuel pressure (steps 1, 5, and 6). The fuel pressure is controlled based on the set target fuel pressure (step 7).

Abstract: In order, to manufacture a high-performance infrared-emitting element having high-speed thermal response characteristics and a high infrared emissivity, a bridge (heat-generating) portion having a separation space is formed on a silicon element substrate. The bridge portion is formed to have a thickness of 5 &mgr;m or less by doping boron as an impurity by ion implantation with a concentration distribution peak value of 1.5×1019 atoms/cm3 or more, and performing annealing under predetermined conditions for activating the impurity layer. In the infrared-emitting element manufactured in this manner, even if the bridge portion is made thin to improve the thermal response characteristics, the infrared emissivity does not decrease because of a high impurity concentration, and a large temperature modulation width can be obtained. In doping boron as the impurity by ion implantation, the dose is preferably set to 3.0×1014 ions/cm2 or more.

Abstract: A binder for coating materials containing dispersed inorganic powder comprises a polyurethane resin containing (a) 2.2 to 7.0 terminal epoxy groups in one molecule in average and (b) 0.1 to 5.0% by weight as SO.sub.3 -- of a sulfonic acid salt group, 0.05 to 3.0% by weight as COO-- of a carboxylic acid salt group, or 0.02 to 1.0% by weight as N.sup.+ of a quaternary ammonium salt group in the molecule, and having a number-average molecular weight of 2,000 to 10,000. A coating material containing dispersed inorganic powder and a magnetic recording medium both use this binder. In a recording medium comprising a magnetic layer placed on a non-magnetic substrate, the magnetic layer comprises polyurethane resin (A) as a binder, vinyl chloride polymer (B) containing 0.

Abstract: The present invention provides a magnetic recording medium comprising a non-magnetic substrate and a magnetic layer formed on a substrate, comprising (a) a binder containing a vinyl chloride resin having sulfoxide groups and (b) a magnetic powder dispersed in the binder (a); and a binder used in said medium for dispersion of magnetic powder, containing a vinyl chloride resin containing sulfoxide groups. The present invention further provides a process for producing said vinyl chloride resin (a binder resin) having sulfoxide groups. The use of the binder resin of the present invention makes it possible to obtain a magnetic coating in which a fine magnetic powder is dispersed stably and which has good coatability. The magnetic recording medium obtained using the magnetic coating has good surface smoothness and good surface durability and is excellent in travelling, magnetic property and electromagnetic conversion property.