• 전력전자학회:학술대회논문집
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• 전력전자학회 2018년도 전력전자학술대회
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• pp.522-524
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• 2018

A New Direct AC LED Driver has been proposed for wide output power range and precise constant current regulation using an advanced auto commutation topology. The conventional shunt regulation method provides a stepped input current shape by fixed regulation references in the linear regulator of the each channel, which results in poor current regulation and high THD. The conventional method needs to assign a linear regulator in each LED channel so that the number of linear regulator increases when extending the number of channels especially at high power application. The proposed regulation method can drive multiple switches to regulate each LED channel current by a single amplifier with sinusoidal reference so that large number of LED channel can be simply extended with less BOM cost and low THD is obtained with the accurate current regulation thanks to the sinusoidal input current control in the closed loop control. To confirm the validity of the proposed circuit, theoretical analysis and experimental results from a 20-W LED driver prototype are presented.

• 전기학회논문지P
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• 제66권4호
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• pp.242-246
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• 2017

In this study, it was investigated about optical simulation in high brightness and high uniformity general lighting using glass light guide plate. And we adopt edge-light emission type light plate. Edge-light type lighting has been used LCD application, especially note PC or smart phone backlight unit. Because it had the good properties such as slim shape and light weight. We thought this type was suitable for general lighting application such as wall attached type or ceiling mount type. But many of edge-light type lighting had problems. It called slanted output light rays. That was main key parameter how could control the direction of output light rays. We investigated the solution of this problems, using ray tracing method, we recognized the major fact of the solution relied on the geometric structure of diffusing dot shape. We set the conditions of aspect ratio in diffusing dot shape such as 0.5 to 1. And, at first, we designed diffusing dots shape based on the results of optical simulation and made specimen. as above condition, and acquired good result in confirming dots shape such as the value of the output rays's peak angle was around 75 degrees. And good light distribution characteristics were measured by slated spectro-radiometer. It was shown that the effective ways of designing light distribution characteristics using optical simulation such as ray tracing linear method for making general lighting using glass light guide plate.

• 한국디지털건축인테리어학회논문집
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• 제11권1호
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• pp.83-90
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• 2011

Lighting simulation is becoming increasingly more important as a method for design and evaluation. There is a wide range of packages that provide the accuracy and the usability in lighting simulation. Relux developed by Relux Informatik AG, Switzerland, Relux offers users innovative and high-performance light planning software with open interfaces and simultaneous access to the latest product data from luminaire and lamp manufacturers. The goals of this report is to explore some of the lighting simulation issues relating to Relux. It is hoped that it will provide some background information that will enable a designer and engineer to make some informed judgements on the potential of the current state-of-the-art in computer prediction of lighting in buildings and how this may be used to assist in building design.

• 한국실내디자인학회논문집
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• 제13권2호
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• pp.176-183
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• 2004

This research is aimed at being a cornerstone to elicit the evaluation methodology of systematic and objective lighting design process on the basis of investigation of documentation and interviews on lighting design of architecture which is drawing more and more attention in an architectural field. In evaluating lighting design in architecture, such factors as appropriate illumination, quality of light, completion degree, reflection of use, visual amenity, understanding, amiability, artistic value, recognition, regional conditions, and extent of glare are to be more considered than anything else. In so far as general sectors of society show ever-increasing interest in lighting design, developments in both its quality and its quantity are also expected; thus, evaluation items shown in this research will be useful in appraisal of interior and exterior lighting of architecture.

• 한국실내디자인학회논문집
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• 제34호
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• pp.124-131
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• 2002

Lighting is the single most important part of the design of a retail store. Good lighting can enhance a product's appearance, accentuate a special display, balance the visual elements of a store, and create the proper mood. In shops the lighting is required to draw the customer's attention to the goods help him to appraise them, and provide an atmosphere conducive to sales. The method will vary according to the types of good displayed, the form of trading, the design of the shop, and the class of customers expected. For the all reason, this study is focused on how the lighting design effects the customer's interest to the goods and intended to prescribe the possibilities of effective lighting design.

• 조명전기설비학회논문지
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• 제26권1호
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• pp.8-14
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• 2012

An economic evaluation is required to reduce the cost of energy and lighting in the design of interior lighting. WEELS2011 is developed as a method of economic evaluation for LED lighting systems. Economic evaluation for fluorescent and LED lightings and after applying rebate to LED system is conducted using WEELS2011. The utilization and analysis of WEELS2011 are suggested for the reduction of energy and lighting cost.

• 한국콘텐츠학회:학술대회논문집
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• 한국콘텐츠학회 2005년도 춘계 종합학술대회 논문집
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• pp.289-294
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• 2005

세계 조명시장은 시대적 변화에 대응하여 기술과 방법론적인 성장을 하고 있다. 그러나 국내 조명시장은 단순한 가격경쟁만을 고집하고 있고 이에 보다 효과적인 조명기술의 개발과 조명 기구디자인프로세스의 정립을 위해 본 연구가 진행되었으며, 연구모델은 PLS조명기술개발프로젝트 중, 300W급 조명기구를 대상으로 하였다. 이 연구를 통해 진일보한 조명기술과 신제품디자인의 상호보완적 개발프로세스를 확립하고, 국내 경관조명시장의 국산화 및 국내 조명 산업의 경쟁력 제고에 기여코자 한다.

• 조명전기설비학회논문지
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• 제14권2호
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• pp.18-25
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• 2000

도시 건물 외부에 조명을 비추기 시작한 이래로 건물경관조명의 중요성은 날로 증가되고 있는 추세이며 이에 따라 본 연구는 서울시의 경관조명을 대상으로 휘도측정, 문헌조사, 설문조사외 분석을 통하여 건물 경관조명 설계 기법을 제사하는데 있다. 본 연구의 결과로 건물상황조사, 건물 상황분석, 경관조명 가능성 선경, 시공 및 후속조치로 이루어전 경관조명 설계 기법 모델올 제시하였다.

• 조명전기설비학회논문지
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• 제22권1호
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• pp.17-23
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• 2008

본 논문에서는 2분할 수광 방식의 측정시스템을 이용하여 수도권 일대의 도로의 조도와 휘도분포를 측정하여 국내 도로조명 실태를 파악함으로써 조명시설들의 특징에 대하여 분석했다. 측정결과 대다수의 도로가 도로의 형태, 조명기구의 점등방식, 도로주변의 가로수 혹은 장애물 등의 영향으로 도로조명 허용기준을 만족시키지 못하고 있었다.

• 조명전기설비학회논문지
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• 제25권11호
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• pp.14-25
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• 2011

Full-Color LED lighting system requires efficient control of the lighting color in order to easily achieve various color effects. In this paper, we present not only a portable color scanner using color sensors which can control lighting color directly from detected color but also methods to convert detected color to a complementary color, similar colors and so on. In addition, we propose a compensation method for measured sensor color to reduce measurement errors more than 50[%] in detected color. The developed color scanner is applied to control full-color LED ceiling light for emotional lighting.