• 조명전기설비학회논문지
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• 제13권2호
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• pp.1-6
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• 1999

평균조도 및 휘도의 계산은 어느 정도 그래픽(graphical)적인 방법 등에 의해서 이루어질 수 있으나, 매우 광범위한 장소에 대한 계산에는 적절한 소프트웨어가 필요하다. 이러한 소프트웨어는 해외에서 이미 개발되어 있으나, 국내에서 설계하기에 적합한 다기능의 프로그램은 없었다. 이에 따라 한글 윈도우에서 실행될 수 있는 형태가 되도록 하는 것을 목표로 하여 프로그램을 개발하였으며, 도로면의 휘도 및 조도 분포뿐만 아니라. ?균 휘도, 평균 조도, 전반 균제도와 차선축 균제도, 임계 휘도 증분, 광막 휘도, 눈부심 등의 계산을 수행하는 프로그램(Lighting Analysis program for Poad, LAPRoad)을 개발하였다. 또한 휘도 계산에 잇어서 노면의 반사 특성은 매우 중요하기 때문에 그 특성을 측정할 수 있는 기구를 개발하고, 콘크리트 도로 반사 특성을 측정하였다.

• 조명전기설비학회논문지
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• 제19권4호
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• pp.47-54
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• 2005

어둡고 한정된 지하공간의 이미지의 개선은 지하개발 성공여부에 중요한 결정요소가 되고 있다. 주거단지 지하주차장의 조명환경은 지금까지 양적 위주의 설계와 운영이 이루어졌으나 이제는 지하주차장 공간의 질적 향상이 필요한 때이다. 이를 위해서 우선 고려해야 할 두 가지는, 첫째로 주차장에서 주로 사용되는 광원에 대한 이해이며, 둘째는 균제도의 향상이다. 특히 겨울철 외기의 영향에 의한 주차장 실내의 심각한 조도저하와 균제도의 유지를 위한 방안이 마련되어야 한다. 따라서 조명기구의 간격, 배열에 대한 변화가 필요하며, 운용에 있어서는 시간에 따른 일률적인 기존의 제어방법에서 벗어나 이용패턴을 고려한 방식으로의 전환이 요구된다.

• KIEAE Journal
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• 제13권4호
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• pp.21-26
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• 2013

Shading devices have become an integral part of the daylighting strategy for sustainable classroom design. The louver type is newly designed shading devices which provide more view to the outside and protect from outside condition such as snow or rain. The purpose of this study is to compare the daylight performance of traditional and louver type overhang and lightshelf. The room dimension was $7.5m{\times}9.0m{\times}3.0m$. The length of shading devices was calculated by Palmero's study. The length of the traditional and louver type overhang was 455mm, 1210mm and lightshelf was 350/810mm, 625/555mm respectively. For the study, the Radiance 2.0 was used to evaluate the illuminance and uniformity ratios. And scale model were used to evaluate sunpatch area on the floor in model was calculated. The results showed that the louver type lightshelf was suitable for spring and summer, and louver type overhang was suitable for winter.

• 조명전기설비학회논문지
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• 제20권7호
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• pp.1-5
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• 2006

도로조명은 차량 운전자와 보행자에게 장애물을 신속 정확히 그리고 편안하게 볼 수 있는 도로의 야간 주위환경을 제공한다. 또한 밤에 도로설비 이용을 원활하게 함은 물론 교통의 흐름을 향상시켜 교통안전을 증진시키는데 목적을 두고 있다. 이 논문은 제주시내 중심가 8개 도로의 등기구 설치현황을 실측조사 하였으며 조명기구 배열방식을 고려하여 4개 도로의 조도 실측을 통하여 수평면조도와 균제도를 기준치와 비교분석하였다. 이를 토대로 제주시 주요 도심지 상가 도로에 관한 시뮬레이션으로 도로조명의 적합한 모델을 제시하였다.

• 한국태양에너지학회:학술대회논문집
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• 한국태양에너지학회 2012년도 춘계학술발표대회 논문집
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• pp.457-462
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• 2012

Daylighting software is an important component to predict the performance of daylighting system in advance of a field demonstration study with installing them in buildings. PHOTOPIA is a powerful software to generate a candela distribution curve(CDC) of an active daylighting system like a tracking dish concentrator. With PHOTOPIA, a set of candela distribution curves was generated under clear sky conditions and different solar altitude angles. The candela distribution curves were then imported to RADIANCE for rendering and analysis on the daylighting performance of a tracking dish concentrator when it installed in a actual class room without windows. As a result, the daylight collection efficiency of the dish concentrator was 68.4% when we assumed that there was no tracking error. It was found that candela(cd) and total lumens(lm) increased with solar altitude rising, whereas the distribution angle was fixed. The illuminance uniformity on the work plane in the class room was relatively low, 0.12, while the illuminance uniformity on the area of $2.7m^2$ to which the light was illuminated was considerably high, 0.60. The maximum illuminance was 1,340lux with a solar altitude angle of 80 degrees.

• 조명전기설비학회논문지
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• 제17권6호
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• pp.16-22
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• 2003

본 연구는 워크스테이션에서 조명방식에 따른 시환경평가를 목적으로 하고 있다. 성능평가를 위해 Radiance 프로그램을 통한 시뮬레이션과 Mock-up실 (15.0${\times}$11.6${\times}$3m)에서의 간접조명 실험을 통하여 사무소 건물의 조명방식에 따른 성능평가자료를 제시하고자 하였다. 본 연구의 결과는 다음과 같다 :1) 대상공간에서 작업면 조도를 살펴보면 첫째, 모든 반사율에서 파티션이 높아질수록 조도비는 낮은 값을 보였다. 둘째, 직접 양측배치방식에서 가장 높은 조도비를 보였으며 직접 중앙배치방식에서 가장 낮은 조도비를 나타냈다. 셋째, 간접조명방식에서 조명의 배치에 대한 영향도가 직접조명방식보다 50% 정도 낮게 나타났다. 2) 대상공간에서 균제도를 평가할 때 첫째, 모든 반사율에 대하여 조도비와 마찬가지로 파티션이 높아지면 균제도는 낮아졌다, 둘째, 간접 양측배치방식에서 가장 높은 균제도를 보였으며 직접 중앙배치방식에서 가장 낮은 균제도를 나타내었다. 셋째, 조명배치에 따른 균제도 범위를 보면 직접조명방식에서 22.5%, 간접조명 방식에서 11.5%의 차를 보여 간접조명방식의 경우 조명배열에 대한 영향도가 적음을 알 수 있었다.

• 교육시설
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• 제15권2호
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• pp.4-15
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• 2008

The purpose of this study was to evaluate the characteristics of daylighting environment in classroom of an school building due to the external shading devices such as fixed louvers, light shelves and exterior venetian blinds. In this study, we have made a field research with regard to the facade design in classroom of an school building. And we have made a classification of external shading devices considering the design parameters. Finally, through RADIANCE simulation, we have calculated the spatial distribution of illuminance, uniformity ratio of illuminance and daylight factors. The results of this study will provide the building designer with the basic daylighting performance data at early design stages.

• 한국조명전기설비학회:학술대회논문집
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• 한국조명전기설비학회 2009년도 추계학술대회 논문집
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• pp.73-76
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• 2009

The optical structure of edge-lit LED backlight has been optimized via simulation study in order to remove bright spots appearing on the entrance region of the light guide plate (LGP) and thus to improve the luminance uniformity. The density of scattering dots located on the back surface of LGP was adjusted according to the location of LED's. In addition, lenticular lenses or a diffuse transmissive surface were formed on the side surface of LGP facing the LED's, and the density of lenticular lenses was optimized for redistributing rays emitted from LED's into wider angles. The bright spots which could be seen from conventional LED backlight were removed by the combination of these two optical structures. The application of diffuse surface to the entrance face gave better uniformity than the application of lenticular lenses. However, dark regions still appear on the entrance region of LGP, which should be removed by more appropriate optical design for achieving better luminance uniformity on the LED backlight.

• 한국태양에너지학회:학술대회논문집
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• 한국태양에너지학회 2012년도 춘계학술발표대회 논문집
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• pp.140-145
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• 2012

The purpose of this study is to understand the change of impression by comparing the uniformity lighting with the compound lighting. In previous study, we proposed a light controlling method to harmonize daylight from a window and artificial lights from a ceiling and obtained the results to support our method. We referred this method as the Adjusted Compound-Lighting Model (AC Model). The model claims that lighting in a room with a side-window are perceived as harmonious when the overall light distribution in the room is well approximated by a compound of lights from the window and the entire ceiling. The experiment is carried out with the scaled-models and mock-up spaces that were supposed to be an office space. One is lit by the uniform lighting and the other by the compound lighting in each experimental space. In order to present varying illuminance distributions, thetwo variables were used in this study. One was the ratio of thelight from the window and ceiling in the standard and evaluation box. The standard box was provided by the ratio of 20% to 40% from the window and 80% to 60% from the ceiling as two lighting ratio patterns [Wu20(=Cu80) and Wu40(=Cu60)]. And the evaluation box was provided by the light ratio of 0% to 40 from the window and 100% to 60% from the ceiling [Wcp0(=Ccp100), Wcp20(=Ccp80) and Wcp40(=Ccp60)]. The other variable was themean illuminance level in both boxes. Two level of mean illuminance (700lx and 300lx) were used in this experiment. Each lighting condition was established at equal horizontal mean illuminance level, held constant near 700lx or 300lx in both boxes. Both of them were similar in the shape of distribution when there were same ratios of lights from the window and the ceiling. Subjects were asked to evaluate the point of difference by semantic differential rating on their overall impression after comparing with two rooms. The results showed that the impressions of compound lighting were more positive score than that of uniformity lighting on the items of 'dim-bright', 'dislike-like', 'artificial-natural' and 'closed-open', and that there was no significant difference in impressions between two spaces on other items.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2009년도 제40회 하계학술대회
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• pp.1607_1608
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• 2009

LED를 조명용으로 사용하기 적합하도록 Lambertian Type의 백색 LED에 1차 렌즈를 씌어서 일정거리의 작업 면에서 균일한 조도를 얻고자, 광학 설계프로그램인 LightTools 를 이용하여 렌즈의 형태를 모델링하고 시뮬레이션을 통해 LED 광원의 배광분포 등의 광학적 특성을 비교분석함으로써 조도 균제도가 우수한 렌즈의 형태를 얻었다.