Systems and methods using the same to achieve a camera having precise timing of a camera shutter, which can be used also for a controllable aperture, are disclosed. The acquired data thus acquired, once processed, permit determination of the position and inclination of the images obtained. The N gated PRN signals are generated based on a local replica PRN signal time-divided by M intervals within a chip period of the local replica PRN signal. The coating layer includes a front portion corresponding to the front of the separator and produced with a plurality of recesses extending in a width direction of the separator orthogonal to the recording medium conveyance direction throughout substantially an entire width of the separator in the width direction thereof. The computer system further includes single and double locker belt retaining brackets. The cruise control ECU checks whether a driver’s actual concentration degree is insufficient relative to a required concentration degree in terms of safety in surrounding environments of the subject vehicle.