• 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.

• 한국정보디스플레이학회:학술대회논문집
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• 한국정보디스플레이학회 2009년도 9th International Meeting on Information Display
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• pp.207-210
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• 2009

According to the recent demand for materials for use in various displays and solid state lightings, new phosphors with improved performance have been pursued consistently. Multi objective genetic algorithm assisted combinatorial material search (MOGACMS) strategies have been applied to various multi-compositional inorganic systems to search for new phosphors and to optimize the properties of phosphors.

• 한국조명전기설비학회:학술대회논문집
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• 한국조명전기설비학회 2006년도 춘계학술대회 논문집
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• pp.16-19
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• 2006

Due to its increased importance, outdoor lighting has been installed even for residental area. For the most part, more outdoor lightings are being installed for those houses designed to accommodate people since 2000. On this respect, quantitative analysis is conducted after finding the cases of outdoor lighting installed for residental area until nu. The cases of 24 residental areas we investigated to find the specific feature of outdoor lightings. This type of design analysis will serve as an attempt to set the stage for future studies.

• 대한설비공학회지:설비저널
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• 제13권1호
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• pp.36-47
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• 1984

Internal heat given off by human beings, lightings and domestic appliances is an Important factor which must be taken Into account estimate of building heating loads. This study outlines the procedures for determining the internal heat from these source and calculates the amount of internal heat added to an heat Ing spaces. This investigation shows that a family of four has a typical hourly internal heat production which averages approximately 460 Kilo- calories an hour in our country.

• 감성과학
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• 제16권3호
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• pp.305-310
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• 2013

This user-centered research aims to empirically evaluate color temperature (K) and illuminance (lx) of residential bathroom lightings to determine the most optimal lighting conditions for productive task performance as well as for satisfying users' emotional needs. Using 3 LED lighting fixtures, 4 types of lighting contexts were investigated; main lighting, task lighting, shower lighting, and bath lighting. Two lightings were installed parallel to the vertical edges of the main bathroom mirror to be used as main and task lighting, while another fixture was installed above the bathtub to be used for shower and bathing. For each lighting context, subjects (N＝54) were instructed to perform a few tasks during which time the users were exposed to different lighting conditions with color temperature ranging from 2700 K ~ 6500 K and illuminance ranging from 100 lx ~ 700 lx. Upon completing the given tasks, subjects were asked to evaluate the lighting conditions and their applicability for performing the given tasks. Based on the user evaluations, the most optimal lighting conditions for the different lighting scenarios are as follow: 1) 3500 K ~ 4300 K and 150 lx for main lighting, 2) 3500 K ~ 4300 K and 500 lx ~ 700 lx for task lighting, and 3) 2700 K ~ 3500 K and 100 lx ~ 150 lx for shower/bath lighting. These results can be used to adjust the lighting standards suggested by KS, as well as be utilized by both engineers and designers in designing new types of user-centered bathroom lightings.

• 전기학회논문지
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• 제60권3호
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• pp.674-679
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• 2011

In this paper, we experimented and analyzed about electric fire risk assessment methods of LED lightings for outdoor. LED lighting is composed of AC power lines, AC/DC converter, DC power lines and LED lamps. There are some risk factors of electric fire in LED lighting such as short circuit between power lines or power line and ground, dielectric breakdown, leakage current, abnormal voltage inflow, poor contacts(connections), etc. As a result of this study, insulation coverings of wire was ignited due to dielectric breakdown between power lines and molten marks were formed in copper conductor. LED lighting was blown out while short circuit, beside that, electrical disorder did not occur. When abnormal voltage was inflowed, electronic components such as varistor, condenser were damaged. Partial heating was produced and insulation was melted and carbonized by arc and heating while poor contacts were happened. We expect that the results of this study would be helpful for electrical safety of LED lightings for outdoor.

• 조명전기설비학회논문지
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• 제29권10호
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• pp.25-33
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• 2015

LED lightings combined with IT technology can provide variable illumination environments that can be controlled by users according to their emotional need and preferences. This is one of the most beneficial functions compared with conventional lightings offering only fixed color and brightness. There is however lack of analysis data for creating practical lighting solutions satisfying user preferences in a wide range of applications from residential to commercial places. To materialize the technical advantages of user-controllable LED lightings, more observation data are required in various situations. Therefore, dissimilar emotional needs are determined in the present study for compartmental office spaces (staff lounge room, meeting room and desk job place) through subjective experiments by 45 observers. The optimum lighting conditions (CCT and illuminance) are finally obtained using Response Surface Method and relevant prediction functions are also deduced. The final outcome can be applied for making user-preferred office illumination products.

• 한국광학회:학술대회논문집
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• 한국광학회 2009년도 창립 20주년기념 특별학술발표회
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• pp.98-98
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• 2009

• 전자공학회지
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• 제35권8호
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• pp.49-59
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• 2008

• Journal of Electrical Engineering and Technology
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• 제11권6호
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• pp.1880-1885
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• 2016

This study aims to design a zonal lumen for parking garage LED lightings of a slim appearance and 20 W/2,000 lm capacity and to fabricate a lighting luminaire accordingly. The frame is of a one-dimensional bar type with a reverse V-shaped section, with LED chips arranged along both sides. To maximize the $60^{\circ}$ to $80^{\circ}$ zonal lumen, the geometric structure was designed with the apex of the reverse V-shaped section at $40^{\circ}$ and both sides at $70^{\circ}$. As for the LED light source, focusing lenses with narrower full-width half-maximum (FWHM) in luminous intensity were used. A ray-tracing simulation method was utilized for the zonal lumen simulation of the given structure. An actual hardware of luminaire based on the simulation results was fabricated and characterized. The suggested model is meant to develop LED lightings with a proper level of zonal lumen required in parking garages.