• Korean Journal of Heritage: History & Science
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• v.52 no.3
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• pp.188-199
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• 2019

In this study, research trends were investigated by examining important academic research on museum lighting that has been carried out in Korea over the past 30 years. The aim was to highlight important studies conducted in Korea on material deterioration caused by museum lighting and to examine the current status of research on LED light sources to provide direction for future research. The ultimate goal of studies on museum lighting is to improve the long-term conservation effects, and this study examined the latest light sources of each era. Prior to the 1990s, the effects of light sources on relics were assessed by investigating incandescent light bulbs and fluorescent lamps, the first museum exhibition lighting. Then in the 1990s, the introduction of halogen lamps and HID lamps led to the analysis of the characteristics of a light source itself and the introduction of illumination standards. In the 2000s, the lighting environment of museums was investigated based on the characteristics of the light sources that had been studied, and in terms of preservation, research was conducted not only to improve the conservation of relics but also to improve the sentiments of visitors. After 2010, LED lamps were introduced; therefore, material deterioration studies on LED lamps were expanded. During this period, enhancements to LED light sources were made, such as reducing the blue spike area and increasing color rendering. With the development of lighting used in museums and art galleries, the direction of the display preservation criteria has led to the need to prepare advanced standards, covering all aspects from the center of illumination to the consideration of the color of an object and the speed of radiation from the light source. Regular studies of museum lighting in a long-term perspective should be planned to standardize the more advanced conditions of material discoloration.

• Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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• 2007.05a
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• pp.170-173
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• 2007

본 논문에서는 LED광원에서 현재 가장 많이 사용되는 MR과 PAR 타입의 램프를 측정 분석하였다. 최대광도 및 광속의 측정값을 비교 분석하였다. 그러나 MR 16 및 PAR 30의 경우 관련 KS 규격상에 광속에 대한 값을 명기하고 있지 않은데 이것은 램프 뒤쪽에 반사경(다이크로익 미러)이 부착되어 있어 가시광을 일정한 방향으로 집중시키는 투광 개념의 광원이므로 광속 측정의 의미가 필요하지 않아서 인 것으로 생각된다. LED광원의 경우 LED자체의 광 확산이 매우 광범위하고, 반사경의 영향을 적게 받고 있어 사이드 방식으로 측정된 상기의 광속값은 불확도 범위이내에 존재할 것이 확실시되므로 향후 LED관련 규격의 제안시 측정이 요구될 것으로 판단된다.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.28 no.8
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• pp.32-39
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• 2014

In general, non-directional LED lamps including high transmittance cover are more advantageous than directional LED lamps, which are efficient enough to improve luminous efficacy and obtain certification, allowing wide manufacture, sale, and distribution. Although KS C 7651(Self-ballasted LED lamps-Safety and performance requirements) was revised in July 2013, however, many companies are having a lot of difficulties in keeping the certification and product development for the lack of the photometric analysis for non-directional LED lamps. In this paper, through the measurement of the angular distribution of luminous flux of incandescent lamp and non-directional LED lamps, we examined the reasonability of non-directional LED lamps' standards as suggested in KS C 7651. According to the results, even if non-directional LED lamps satisfy KS C 7651, when compared to an incandescent lamp, they showed less diffusive than the incandescent lamp and the distribution of the luminous flux depending on the angle fluctuated greatly even among LED lamps. Judging by the result, the current standard of the non-directional LED lamps, KS C 7651, has been comprehended that the angular distribution of the luminous flux needs to be presented after being much more thoroughly standardized.

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2013.05a
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• pp.1183-1184
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• 2013

• Proceedings of the Korean Society of Precision Engineering Conference
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• 2010.05a
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• pp.421-422
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• 2010

• Journal of the Korea Academia-Industrial cooperation Society
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• v.18 no.8
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• pp.25-33
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• 2017

This paper reports the optical design of the MR-16 lamp series with a LED second lens and an aspherical plano-convex lens suitable for a simple and rapid injection molding fabrication method. The fabrication and performance evaluation of the MR-16 lamp series, which was designed with a narrow angular distribution of luminous intensity, were conducted to replace halogen lamps with LED lamps. Four types of LED lamps were fabricated, which have angular distributions of luminous intensity of $22.4^{\circ}$, $31.1^{\circ}$, $37.3^{\circ}$, and $59.9^{\circ}$ and luminous efficiencies of 76.5 lm/W, 75.2 lm/W, 72.0 lm/W, and 77.8 lm/W, respectively, while their spreading angles with an illuminance uniformity of 81% were $3^{\circ}$, $15^{\circ}$, $22^{\circ}$, and $49^{\circ}$, respectively. After eliminating a yellow tail of the LED lamps using a diffusion sheet, the angular distributions of the luminous intensity were measured to be $20.8^{\circ}$, $31.5^{\circ}$, $37.8^{\circ}$, and $68.7^{\circ}$.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2010.10a
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• pp.757-758
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• 2010

At the time of medical treatment and surgical operation, halogen lamp and plasma lamp were mainly used as luminous source for lighting. These two luminous sources have drawbacks that the life of lamps are not long, various problems are brought about due to excessive heat generation and its volume is very big because of cooling device. Accordingly, in this research a ring light was developed so that a partial shadowless shooting for the patient's affected area at the medical treatment room and surgical operation room using high luminance LED for which attention is being paid as new lighting parts for medical purpose. LED which was applied to the development used high luminance three color LED for full color for which various color materialization and the adjustment of radiation intensity are possible and we can get white light in order to emphasize the delicate expression for generic tone of shooting object, strong highlight, simple shadow and three dimensional effect at the time of close-up shadowless shooting of the affected area.

• Journal of the Korean Society of Manufacturing Process Engineers
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• v.17 no.6
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• pp.117-123
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• 2018

Automotive headlamps have been continuously developed as one of the most important devices for securing the driver's view, and the LED lamps are getting popular in recent years. However, in case of the LED lamps, because the heat generated by the LED lamps are too high, it shorten the product life and lower the LED efficiency. Therefore, this study was investigated the cooling characteristics of the LED lamp heat sink for automobile by forced convection for LED heat generation control. In order to analyze the cooling characteristics of the heat sink, the temperature distribution results were investigated through the experiment and computational analysis under the increase of the air flow velocity, and the convective heat transfer coefficient was obtained. Also, convective heat transfer coefficient was calculated by the theoretical formula under the same condition and compared with experimental and computational results. From the result of this study, as the air flow velocity around the heat sink fins increased, the convective heat transfer coefficient significantly increased, confirming the improvement in the cooling effect.

• Electric Engineers Magazine
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• v.261 no.5
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• pp.13-21
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• 2004

조명설비는 에너지 사용의 약 30%를 차지하는 중요한 전기설비이며 LED, 무전극 램프 등 새로운 광원의 개발과 이를 응용한 기기가 최근 급속하게 팽창하고 있어 이들에 대한 이론적 이해가 절실한 상태이다. 따라서 LED와 무전극 램프에 대한 개괄적 소개와 함께 전자식안정기 선정시 유의사항과 취급 그리고, 방전 등의 기초 이론 및 주요 조명용어에 대하여 논하였으며 조명 기술자를위한 간접조도와 직접조도 계산법과 최신의 조명제어와 건물 자동제어에서 open protocol을 이용한 LONWORK 시스템에 대하여 외국 서적을 번역한 내용을 소개하였다.<중략>

• Electric Engineers Magazine
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• v.262 no.6
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• pp.16-25
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• 2004

조명설비는 에너지 사용의 약 30%를 차지하는 중요한 전기설비이며 LED, 무전극 램프 등 새로운 광원의 개발과 이를 응용한 기기가 최근 급속하게 팽창하고 있어 이들에 대한 이론적 이해가 절실한 상태이다. 따라서 LED와 무전극 램프에 대한 개괄적 소개와 함께 전자식안정기 선정시 유의사항과 취급, 그리고 방전등의 기초 이론 및 주요 조명용어에 대하여 논의하였으며 조명 기술자를 위한 간접조도와 직접조도 계산법과 최신의 조명제어와 건물 자동제어에서 open protocol을 이용한 LONWORK 시스템에 대하여 외국 서적을 번역한 내용을 소개하였다.<중략>