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A canister filled with activated carbon prevents the emission of hydrocarbon into the air, through repeated adsorption and desorption process. A small amount of hydrocarbon, with n-butane as one of the major components, remains inside the canister. The diffusion of this residual n-butane affects Diurnal Breathing Loss performance. This study reports the quantitative difference of n-butane diffusion and breakthrough under three experimental conditions. Furthermore, diffusion speed, which is an important factor in the analysis of canister performance and the design development of canister, was also calculated.

Automotive radar is one of the most important key technologies in sensors for Intelligent Transport Systems (ITS). It is considered very important to conduct analysis of the results which the radar took under various road conditions. In this paper, we shall report the results of a 76GHz automotive millimeter-wave radar using SS modulation technique, which were evaluated on roads under various situations. For example, multi-path was observed from the results that were analyzed from inside a tunnel. We believe that the results are very useful for development of the object discrimination algorithm.

Various radar systems have been proposed as collision avoidance sensors for automatic braking and warning applications. Practical use of laser radar systems is near with the introduction of high power, high reliability laser diodes. Utilizing these new devices, a laser radar system has been adapted for measuring the distance to objects in its path. It was first shown that reflectors on the rear of the automobile possess high reflectivity and sharp directivity. Given these characteristics, a compact laser radar system was tested that employed 12W laser diodes and PIN photodiodes. The maximum range of approximately 100 m was obtained. Furthermore, the ability to discriminate other vehicles from roadside objects was achieved by detecting discontinuity in measured distance data through a microprocessor. These results show that the performance of laser radar is comparable to that of microwave radar.