• Journal of the Korean Institute of Rural Architecture
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• v.10 no.3
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• pp.27-34
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• 2008

Recently, the outdoor lighting of architectural Facade has increased for the improvement of night-scape in urban and coastal resort. The purpose of this research is to analyze lighting characteristics; Luminance, Illuminance, Color Temperature, Chromaticity in Gyengpo Park of Eastern famous coastal resort. The result of this paper is as follows: 1) The Luminance ratio was measured that compare to the 1:10 criterion(IESNA) was in excess to the most building except "K". Because of these condition, Luminance environments was injurious to visual health the overuse of the outdoor lighting or glare to the eyes. 2) The level of vertical Illuminance value was insufficient 33.3% among the cases of survey with 4Lux standard of CIE. 3) The kinds of outdoor lighting of BLDG were increased lighting emitting diode(LED), metal halide(MH) instead of reduction trend of neon, fluorescent light, halogen. As the crisis of Energy resources we will be investigate adapt method of outdoor lighting, which design is based on economical efficiency by the use of optimum lighting.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.13 no.1
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• pp.296-305
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• 2012

In this paper, we develop about glare phenomenon at security light caused by light source's straight characteristic, maintaining uniformity ratio of illuminance as high, have long light distribution not by symmetry of rotation but a single axis. we develop second lens for security light that lack of light distribution phenomenon at each of security light can be solved. Our developed light system design satisfies lighting standard of security light's and shape of lens is single lens. so our lens optimizes designing or analysis by using lighting design and interpretation program. Making a Mock-up to do real measure, we have intensity of illumination and maintaining uniformity ratio of illuminance measurement data.

• Proceedings of the Korean Institute of Surface Engineering Conference
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• 2018.06a
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• pp.89-89
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• 2018

스마트 폰이나 내비게이션, 태블릿 PC, TV 등 디스플레이 소자가 휴대 가능해지고 고급화되면서 빛 반사로 인한 눈부심, 시인성 저하 등에 대한 문제가 제기되고 있다. 디스플레이의 반사방지를 위해 방현성(anti-glare) 및 반사방지(anti-reflection) 특성의 코팅이나 기능성 필름에 대한 연구 개발이 이루어지고 있다. 특히 반사방지 기능 부여를 위해 나방눈(moth-eye) 구조를 모방하여 표면 나노 구조 형상화에 대한 연구가 활발히 진행되고 있지만, 나노 임프린팅 및 리소그라피 공정을 통한 패턴 공정은 마스크나 몰드를 필요하고 대면적 제작에 어려움이 있다. 본 연구에서는 폭 300 mm급 롤투롤 이온빔 표면처리를 통해 나노 구조 몰드 필름을 제작하였고, 이형용 수지를 이용한 표면 구조 전사를 통해 모스 아이 구조와 같은 나노 구조 패턴이 전사되는 것을 확인하였다. 나노 구조가 전사된 필름에 대한 투과도 관찰 결과, 전체 투과도 91% 이상으로 투과도가 약 3% 향상되고 반사도는 저하되는 결과를 확인하였다. 롤투롤 장비를 이용하여 대면적 필름 제작이 가능한 것을 확인하였고, 나노패턴의 구조 형성 및 반사방지 기능에 대한 신뢰성 검토를 통해서 양산화 가능할 것이라 전망된다.

• Proceedings of the Korean Institute of Building Construction Conference
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• 2018.05a
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• pp.251-252
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• 2018

Cool roof coating materials generally use white color which has the highest reflectance, but it is a tendency to apply various colors because it can cause glare and fatigue of a nearby building user due to the urban beauty and high reflection. This study when applying color diversity material cool roof coating was carried out as a basic research for the degree of solar radiation reflectance change. Experiment result. As a result of the measurement of the reflectance of each specimen, white showed the best reflectance in the near infrared region, and black had the lowest reflectance. Also, in case of brown, it was confirmed that the reflectance of solar radiation in the near extrinsic region is lower than that of gray.

• KIEAE Journal
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• v.8 no.1
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• pp.45-52
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• 2008

Daylighting systems can improve the luminous quality of indoor environment and reduce the building's electric lighting energy consumption. For designing good daylighting, place the light where it is desired and avoid excessive contrasts, glare and high light levels. Sun scoop, light scoop and sun catcher systems have been used for alternative systems compared to other natural lighting systems. This study aims to evaluate daylighting performance of sun scoop, light scoop and sun catcher systems using scale model experiments. For the purpose, the 1/10 scale models of the systems were made as the same areas of glazing(10 percent of floor area) on the top of the center roof. Totally 15 measuring points of illuminance on the horizontal work plane were monitored from 09:30 to 12:30 on October 29, 2007. Agilent data logger and photometric sensors Li-cor were used. As the results, the topside lighting systems can improve the illumination uniformity than side lighting and top lighting. However, the appropriated shading system should be integrated to prevent the direct sunlight.

• Journal of the Korean Solar Energy Society
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• v.34 no.5
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• pp.101-108
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• 2014

The performance of the daylighting in buildings depends on building site and shape. As an energy saving design strategy, daylighting is a key issue in green building design. In this paper, the influence of the adjacent or obstructed building on daylighting performance of the office building in urban area was analyzed. A typical office building about 20 storeys with obstructed buildings has been modeled and simulated using Radiance. The parametric simulations have been performed to analyze the influence of the daylighting performance (illuminance, luminance) of the analyzed office. The results show that the possibility of the glare was decreased when the obstructed building is located in south, also the illuminance level was significantly decreased. When the obstructed building is located in north, the changes of the illuminance level and luminance possibility were somewhat small compared to the unobstructed condition. The daylighting performance of the analyzed building was most affected by the obstructed building in winter season.

• Journal of the Korean Solar Energy Society
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• v.33 no.2
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• pp.84-92
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• 2013

Blinds are a common type of shading device and are increasingly operated automatically to overcome the limitations of manual operation. Automated blinds need to be controlled to maximize benefits of daylight in the point of occupant comfort and energy consumption. However, the previous control methods could cause occupant's distractions by the undesirable control time interval and amount of blind movement. A few researches suggested the control concept for minimizing occupant's distractions by automatic blind control, but they did not provide optimal control algorithm to be useful in practice. In this paper, we propose an optimal control algorithm for automated blinds that can maximize not only visual comfort but also sunlight penetration into buildings based on occupants' preferences on blind movement and sunlight. The proposed control algorithm can prevent solar glare on workplane and minimize occupant's distractions to maximize occupants' visual comfort.

• Solar Energy
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• v.10 no.2
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• pp.77-85
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• 1990

In the present analysis, a number of sun control devices are examined for their performance in promoting the interior visual environment. Two exemplary cases are introduced for their excellence in harnessing the concept of daylighting and passive concepts. Of these, the Johnson Controls branch office building in Salt Lake City manifests the effectiveness of light shelves and clerestory windows in implementing these concepts. Distinct optical characteristics are found for overhangs, light shelves, louvers, and blinds as they interfere with the path of sunlight. Substantial amount of energy could be saved if the fundamentals of these devices are truly understood in their application to residential and commercial buildings. Sustained efforts should be made in this regard by the builders, architects, energy consultants, and educators who make contributions in energy management.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.26 no.4
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• pp.6-13
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• 2012

In this paper, we took an indirect reflectance type that irradiates light from an LED module, which reflects light from a reflector onto the road. This LED pedestrian lighting design produces minimal glare from a relatively simple structure. Using LightTools 7.2, we conducted a study on the varying shape and curvature of the reflector. In order to further investigate this data, we researched the ratio of the DLOR and ULOR, the average illuminance, and the uniformity of the illumination. Based on this research, we selected optimum conditions to realize the actual LED pedestrian lighting using RELUX software. We found the average illuminance value to be 22[1x] and the illuminance uniformity ratio to be 0.23, which met the criteria of the proposed standards set in KS C 7658. In addition, it also satisfied the criteria of the standards set in KS A 3701 by having TI (Threshold Increment) at 7[%].

• KIEAE Journal
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• v.9 no.6
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• pp.65-72
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• 2009

Lighting for outdoor advertising is very common feature of building facades as they provide the information and commercial identification. As the interest of improving street beautification more widely, application of various lighting technologies has been develop for advertisement such as electric sign board and signage. Furthermore, the installation of higher sign luminance than needed has many negative consequences, including higher energy consumption and light pollution. There are now no standard for outdoor advertisements in terms of luminance, and installation of indiscreet outdoor advertisement without luminance consideration is becoming more commonplace. This study was to evaluate the luminous characteristics of outdoor advertising as a function of sign and building facade luminance, luminance ratio. Data were collected on 8 electric sign boards, 20 internally illuminated, externally illuminated, neon, and channel letter signs and 4 commercial areas. Photometric measurements were taken by CS-100(Minolta) and ProMetric-1400(Radiant Imaging) for various sign modes and sign design. Also luminance of building facades were analyzed according with CIE standard of maximum obtrusive light permitted for exterior lighting installations. The findings are as follows; (1) There were excessive luminance of electric sign boards that could affect adjacent building facade and night sky luminance. (2) Sings that are externally illuminated providing an inappropriate amount of light on to the outer surface of the sign caused higher building facade luminance and potential of unnecessary glare.