Although research and technology developments have recently increased to save lighting energy within buildings, such research and technology development are judged to be unsuitable for energy savings since they are limited in the sense that the application of the technology is fragmented. This study proposes a user and location awareness technology applied to dimming lighting control system and verified the effectiveness of energy savings by building a test bed. The results were as follows：1) This study suggested a user and location awareness technology applied to dimming lighting control system.2) The system shows 96.6% and 82.8% energy saving rates, respectively, on the basis of one user, compared to an on/off lighting control and the user and location awareness technology applied to on/off lighting control system. 3) The energy consumption of the user and location awareness technology applied to on/off lighting control system and the user and location awareness technology applied to dimming lighting control system increased to 96.6%, 88.3%, and 59.6% and 82.8%, 85.0%, 51.5%, respectively, on the basis of one, two, and three users, compared to the on/off lighting control system. This study confirmed the energy saving performance of the user and location awareness technology applied to the dimming lighting control system through performance evaluation. In this regard, further study needs to be undertaken to evaluate the performance at night time.

Light-shelf is one of the most efficient natural lighting systems due to the improved function of the inflow level of the outdoor natural light. However, the existing research on the light shelf limits to the rectangular parallelepiped space, so do not provide sufficient data for various shapes of spaces. Thus, this study aims at deriving proper plan and relationship of the light shelf through its performance assessment depending on the indoor space shapes and utilizing them as basic data of light shelf design. The conclusions are as follows：1) for 6m space depth, standard intensity of illumination satisfaction depth has shown 8.3%～26.3% improvement through the adjustment of the angle and width when installing light shelf compared to no light shelf installation; 2) -30˚, -20˚ and -10˚ light shelves set by this study play only as a blind regardless of the shape of ceiling on the summer solstice, and it is unsuitable; and 3) this study has derived proper plan of light shelf upon space shapes based on energy reduction and indoor evenness. The study results provide expanded data of the performance assessment of the light shelves according to the different space shapes and light shelf factors, which serves as a basis of the light shelves designing.

Abstract. Various studies are currently carried out to solve a problem of lighting energy savings, as the importance of it increases. Especially, a variety of researches and application of light-shelf are conducted, as their efficiency has been acknowledged. However, in order to enhance the daylighting performance efficiency of a light-shelf, using materials with high reflectivity becomes a problem due to glare. This study undertakes performance evaluation according to light-shelf's reflectivity on the summer solstice and aims to draw proper light-shelf variables based on the analysis results. The results of this study are presented below: 1) The increase of reflectivity and angle of a lightshelf raises average illuminance and illuminance deviation. 2) the increased angle and reflectivity of light-shelf improve the average of illumination, while uniformity factor varies. This suggests that we should be carefule to construct light-shelf.3) The number of measured illuminances meeting standard illuminance, 400lx, is the same from 70% to 90% of the reflectivity of a lightshelf, which proves that simple enhancement of light-shelf's reflectivity is not favorable to daylighting performance improvement. 4) Proper variables of a light-shelf on the summer solstice are drawn to 10° in angle and 70% in reflectivity.

Light shelf is an efficient system that reduces the energy consumption by bringing the natural light down to the deep spaces inside of a building. However, the existing light shelves have limits in reducing energy usage, because the direction of the light flow is determined by the external environment such as the altitude of the sun and the azimuth. This current study presents a system that increases the efficiency of the light shelf by applying the Location-Awareness technology, in which the efficiency was verified through the performance evaluation. According to the examination of the technology for the Location-Awareness within residential space, 'Zigbee' type appears to be the most appropriate. The Location-Awareness technology operates the light shelf based on both the angle control axis and the light shelf angle control axis through the modularization of the reflector surface which is less affected by the external environment. The results of the performance evaluation showed that the movable light shelf that employs the Location-Awareness technology can reduce the energy consumption for lighting by 98.3% compared to the fixed light shelf and by 97.3% compared to the movable light shelf without Location-Awareness.