• 한국ITS학회 논문지
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• 제17권6호
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• pp.185-201
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• 2018

야간 도로를 주행하는 운전자의 안전을 위한 대표적인 대책으로 등주식 도로조명의 설치가 선호되고 있다. 그러나 기존 등주식 형태 도로조명의 경우 노면으로부터 일정 높이에 설치되는 특성으로 인해 광원이 운전자에게 직접적으로 강한 눈부심을 주어 운전자의 시인성을 저해하고, 도로 외의 지역에도 빛이 누설되어 에너지 효율이 떨어질 뿐 아니라 주거지역이나 동식물에 장해를 주는 빛공해가 발생하게 된다. 이러한 문제점을 해소한 낮은 위치에 설치되어 조명이 도로만을 비추는 형태의 낮은 조명이 해결책으로 제안되고 있으나, 도입 초기인 낮은 조명이 도로조명등급을 만족하여 도로조명으로서의 역할을 할 수 있는지에 대한 연구는 부족한 실정이다. 따라서 본 연구는 도로조명으로서 요구되는 최소한의 시인성능 기준을 만족함과 동시에 빛공해를 근본적으로 차단할 수 있는 구조의 낮은 조명을 개발하고 기존 등주식 조명과 시인성능 비교를 수행한 결과를 제시하였다. 비교결과, 기존 등주식 조명에 비해 평균노면휘도, 균제도, 임계치 증분 평가에서 우수한 결과를 나타냈다.

• 한국조경학회지
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• 제38권5_2호
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• pp.186-193
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• 2010

The purpose of this study was to survey the citizens for their satisfaction with the outdoor landscape lighting in Gyeongju Historic Areas registered as UNESCO World Cultural Heritage in November 2000 and thereupon, provide for some basic data useful to the design of the outdoor landscape lighting for the cultural properties. As a result of examining the conditions of the outdoor landscape lighting in Wolseong Zone of Anapji, Banwolseong, Dongbu Sajeokji, Cheomseongdae and Gyerim, there were found 391 lighting fixtures of 12 types in Anapji, 138 lightings of 4 types in Banwolseong, 38 lightings of 6 types in Cheomseongdae, 28 lightings of 3 types in Dongbu Sajeokji and 54 lightings of 5 types in Gyerim. As a result of analyzing citizens' satisfaction with the outdoor landscape lighting, it was found that citizens were satisfied more or less with the nightscape image changed by the outdoor landscape lighting; their satisfaction scored 3.836 on average for Anapji on a 5-point Likert type scale, 3.516 for Banwolseong, 3.446 for Dongbu Sajeokji, 3.650 for Cheomseongdae and 3.479 for Gyerim. However, citizens' satisfaction with the originality of the nightscape was generally low: 3.055 for Anapji, 2.914 for Cheomseongdae, 2.877 for Banwolseong, 2.847 for Gyerim and 2.665 for Dongbu Sajeokji. On the other hand, since most of the lighting fixtures were installed as inserted lights or floodlights, the color tones of light source were relatively highly distinctive, but the peripheral spaces around the cultural properties were rather dark, which means that citizens were feeling inconvenient more or less for using the amenities such as bench or waste box. All in all, their satisfaction with the outdoor landscape at the sample zone at night scored 2.981, lower than the normal level.

• 조명전기설비학회논문지
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• 제29권2호
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• pp.8-18
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• 2015

This paper proposes a dimming method and a hybrid LED driving circuit suitable for the ultra high definition (UHD) broadcasting. There are major two problems during the dimming control for traditional LED broadcast lightings; one is a flicker that occurred when camera filming to these lightings, and the other is that linear control is impossible for LED luminous intensity under 10% due to LED electrical characteristics. The proposed dimming method and the driving circuit are designed to solve two problems simultaneously. For high level dimming control region from 10 to 100%, the analog control method was applied to the switching regulator constructed by MOSFET operated in the saturation region. For low level dimming control region under 10%, the fast PWM control method with the linear regulator constructed by MOSFET in the ohmic region was used. We verified experimentally that the dimming method is able to control the luminous intensity linearly from 1 to 100% and the flicker disappears on images taken by the charge coupled device (CCD) and the complementary metal oxide semiconductor (CMOS) cameras. Therefore, the proposed method is suitable for the UHD broadcasting.