Blockchain Papers

Yean‐Fu Wen, Chen‐Min Hsu

No abstract is available for this record.

I.V. Karelin, I.V. Akimova, E.S. Grosheva, V.V. Artukhin

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Yoshikane Kojima, Yoshiki Nakamura, Yōkō Kato, Chikako Ohki · 6 authors

Japan establishes the goals to realize ZEBs (net zero energy building) in average newly constructed public and private buildings by 2030. The primary energy consumption of the illumination in the office building accounts for around 20% of the whole building. Therefore, thorough saving energy is demanded for illumination to achieve ZEB. The effective method for the saving energy of illumination is the use of day light. The natural light of the workplace in office building is generally adopted through a side window. Venetian blinds are installed in the window for solar shading. In the automatic blind control system installed at the large scale building, slats of blind are uniformly controlled by illuminance censor fixed on the top of the building. This is not able to detect direct sunlight and the light from adjacency building at the side window. We devised technique to detect not only the direct sunlight but also the dazzling borrowed light from adjacency building based on a luminance image provided with a CCD camera for the purpose of the development of the higher precise judgment of solar shading. We built the system which could perform shading immediately at the time of the detection and introduced it into the actual work office. As a result of proof experiment, the following knowledge was provided in conclusion. 1) A method to measure high range of luminance including direct sun light and the borrowed light by a fisheye lens and the CCD camera which attached two kinds of filters which varied in the spectral transmittance was showed. 2) Using luminance contrast (C value) and the logarithm luminance mean (A value) to be provided by N filter and the averaging filter developed by Nakamura, detect direct rays of the sun and borrowed light can be identified in luminance image. 3) The threshold of C value: 0.4 and A value: 4.5 that can detect direct rays of the sun and borrowed light using the luminance image measured at single shutter speed of 1/200 second by the CCD camera are identified for speedup of the control. 4) The evaluation method proposed in this study applied to blind control system in actual workplace could detect direct sun light and borrowed light of neighboring buildings with high precision and was able to confirm the usefulness and effectiveness. 5) The possibility that could contribute to increase of the day lighting and view-related improvement by controlling every window is showed 6) The result of this study showed the possibility that could help it toward the spread of blind control systems with higher precision.