• Title/Summary/Keyword: Luminous Sources

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Development of the Design Algorithm of Prismatic Luminaire with Electrodeless Lamps (무전극 광원의 프리즘조명기구 설계 알고리즘 개발에 관한 연구)

  • Kim, Chul-Han;Choi, An-Sub;Kim, Hoon
    • Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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    • 2003.11a
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    • pp.37-42
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    • 2003
  • Development of light sources has been constantly grown after incandescent lamps had been invented by Thomas Edison. Recently, the eletrodeless lamp is introduced as a new light source of a high efficacy and long life. But, despite of such advantages, luminaires of electrodeless lamps are not widely used. It is necessary to develope the design of the luminaire together with light source development. In this paper, design algorithm of the luminaire that is adaptable to electrodeless lamp and use Genetic Algorithm as a optimization method to find luminous intensity distribution required is introduced.

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Measurement error comparison of slab width thickness using LED luminous sources and laser beam (LED광원과 레이저빔을 이용한 Slab 폭.두께 측정 오차 비교)

  • Kim, Tae-Soo;Chun, Joong-Chang
    • Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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    • 2010.05a
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    • pp.946-949
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    • 2010
  • 철강회사의 열연 Slab 표면의 폭 두께를 측정하여 공정시에 이들 측정 데이터를 이용하여 양질의 제품 생산을 위한 공정 제어에 이용하고 있다. 이 경우에 카메라를 사용하여 측정하거나 레이저 스캐너를 이용하여 측정하고 있다. 본 논문에서는 카메라와 레이저를 이용하여 폭 두께를 측정하는 시스템을 구축하고 이렇게 구축된 시스템에서 레이저빔과 LED광원을 사용하였을 때 물체의 실제 길이와의 측정오차를 비교한다. 그 결과 LED광원을 이용하였을 경우 레이저의 경우와 유사하나 가격이나 생산현장의 환경을 고려하면 보다 효과적이라 하겠다. 또한 정밀한 측정을 요구할 경우 이 두 광원을 동시에 사용하면 양호한 결과를 얻을 수 있게 된다.

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Optimum Design of Ring Light for Medical Purpose using High Brightness LED (고휘도 LED 를 이용한 의료용 링 라이트의 최적 설계)

  • Cheon, Min-Woo;Park, Yong-Pil
    • 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.

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IGRINS Test Observation Results from Seoul National University

  • Koo, Bon-Chul;Lee, Yong-Hyun;Kim, Hyun-Jeong;Kim, Yesol;Lee, Jae-Joon
    • The Bulletin of The Korean Astronomical Society
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    • v.39 no.2
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    • pp.94.1-94.1
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    • 2014
  • We have carried out IGRINS test observations during its May commissioning run. Our targets were composed of three Luminous Blue Variables (LBVs), one supernova remnant (SNR), and an unidentified stellar source emitting [Fe II] 1.644 um line. In the preliminary results, three LBVs MWC 314, P Cygni, and AFGL 2298 show different characteristics: the spectrum of MWC 314 which is known to be in a binary system clearly shows double-peak structures in hydrogen and iron lines, the P Cygni spectrum reveals the Brackett series of hydrogen emission lines with prominent P-Cygni profiles, and AFGL 2298 likely at its visual minimum phase shows rather different spectrum with relatively weak hydrogen lines. The SNR (G11.2-0.3) was to test the sensitivity of IGRINS for diffuse emission. We successfully detected a dozen H2 emission lines with a velocity width of ~13 km/s, which might indicate a C-shock origin. The unidentified stellar source was one of stellar/compact sources of unknown nature detected in the survey of the Galactic plane in [Fe II] 1.644 um emission line (http://gems0.kasi.re.kr/uwife/). Its spectrum is under investigation. We will present the spectra of test observations and will discuss their scientific significance.

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The Performance of generated Heating Energy from Interior Lighting Fixtures (실내조명의 발열량 예측에 관한 실험 연구)

  • Choi, Jong-seon;Lim, Hong-Soo;Kim, Kyung-Ah;Lee, Keum-hwan;Koo, Jae-Oh;Kim, Gon
    • KIEAE Journal
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    • v.10 no.6
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    • pp.27-32
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    • 2010
  • Approximately 20 percentage of energy consumptions in buildings is consumed as lighting energy. Thus, most of the corporations of lighting fixture have launched low energy products. However, many researchers focused on the only luminous efficacy for energy conservation and used the evaluating tool of study. This can not gauge the precise cooling load related on generated heat of artificial lighting. In order to assess an effect of the temperature variation of lighting resources, the main purpose of this study is to predict the generated heating energy from lighting by measuring the thermal variation in scale model to reduce external noise. Also this paper used MX100 data logger to record at an interval of 1 minute for 60 minutes for the temperature of interior lightings such as incandescent lamp, fluorescent light, halogen lamp and LED lamp. As a result, LED lamp generated the lowest heat. On the other hand, incandescent lamp did the highest.

Evaluation on the Cooling Performance to Design Heat sinks for LED lightings (LED 조명용 히트싱크 방열기 설계를 위한 냉각성능 평가)

  • Jung, Tae-Sung;Kang, Hwan-Kook
    • Journal of the Korean Society for Precision Engineering
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    • v.29 no.7
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    • pp.778-784
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    • 2012
  • In comparison with some other light sources, LED has merits such as increased life expectancy, fast response, pollution free, and high energy efficiency. Lately, due to development of LED with high brightness and capacity, LED has widely used in many industrial fields such as automotive, aviation, display, transportation and special lighting applications. Since the high heat generation of LED chips can cause a reduction in lifetime, degradation of luminous efficiency, and variation of color temperature, studies have been carried out on the optimization of LED packaging and heat sinks. In this study, experiments on measuring the heat generation rate of LED and the cooling performance of a heat sink were carried for analyzing the thermal characteristics of LED lighting system in free convection. From the results, dimensionless correlation on the cooling performance of heat sink in natural convection was proposed with Nusselt number and Rayleigh number as a guideline for designing cooling device of LED lightings.

An Energy-efficient LED Lighting Control Scheme with Provision of User Illumination Requirement (사용자 요구조도 보장 에너지 효율적 LED 조명 제어 기법)

  • Kim, Yong-Ho;Lee, Kwon-Hyung;Chang, Kap-Seok;Choi, Yong-Hoon;Kim, Hoon
    • The Journal of Korean Institute of Communications and Information Sciences
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    • v.36 no.11B
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    • pp.1383-1388
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    • 2011
  • Due to many recent activities on enforcement of the intensified environmental regulation such as the policies of curbing the greenhouse gas and the Restriction of Hazardous Substances (RoHS), the usage of Light emitting diode (LED) has been rapidly increased and energy efficient management of LED light system is regarded as an important technology to enhance the energy efficiency. In this paper, we propose an energy-efficient control scheme of LED light, being composed of multiple light sources. The proposed scheme controls the intensity of LED light source to minimize the total intensity while providing the quality of lighting service. The intensity of light is assumed to be proportional to power consumption, thus the objective is to minimize the total power consumption. A linear programming problem is formulated to find the optimal intensity of each light source and procedure to apply the proposed scheme in the real system is suggested. The performance evaluation results elucidate that the proposed scheme achieves over 20% improvement in power consumption of light intensity in comparison with the conventional dimming control scheme.

The Prediction of Interior Luminous Effect Through a Comparison of Shading Algorithms (음영처리기법의 비교를 통한 실내공간 조명효과의 예측)

  • Hong, Sung-De;Park, Hyoun-Jang
    • Journal of The Korean Digital Architecture Interior Association
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    • v.5 no.1
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    • pp.9-16
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    • 2005
  • In Interior design, light is the most important factor in deciding color, texture and illumination level which are the basic factors of spatial design. To apply rendering technologies on prediction of illuminating effect, it is important to understand and analyse the basic properties of the illumination models that are local illumination model and global illumination model. The illumination models in computer graphics express the factors which determine the surface color, texture and light distribution through the reflection. The purpose of this study is to propose the best way of shading algorithm in interior space provided by the computer, based on the experimental analysis that 5 shading methods are applied to the interior space. The results of this study were as followed. 1) Local illumination models that are Lambert shading, Ground shading and Phong shading are not suitable to the prediction of interior illumination effect. 2) Ray tracing that is global illumination model could be adopted to interior illumination effects. Ray tracing is a very versatile algorithm because of the large range of lighting effects it can model. 3) Neither radiality nor ray tracing offers a complete solution for simulating all interior illumination effects. 4) Radiosity excels at rendering diffuse-to-diffuse inter-reflections and ray tracing excels at rendering specular reflections. By merging both shading techniques, that offers the best of both. Using computer technologies to simulate lighting in preliminary design stage which will provide information for designers and occupants to determine the effect of using artificial light sources at each stage of their design process. Further study in illumination analysis, prediction of illumination effect, and lighting calculation is required as computer media expands.

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Luminous Characteristics of Bridge's Nightscape across the Han River (조명물리량 측면에서 본 교량의 야간경관 평가)

  • Hwang, Tae-Yon;Kim, Jeong-Tai
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.20 no.1
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    • pp.7-18
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    • 2006
  • This study aims to analyze the illumination effects of bridges across the Han River. For the purpose, 8 bridges were selected. Field survey and measurements were performed, and the physical values such as luminance, color temperature and chromaticity were measured by Radiant Imaging Prometric 1400 Color. The results of the study are as follows; (1) Metal halide lamp, sodium lamp and LED(Light Emitting Diode) of various colors, are used in illuminating the bridges and create color contrasts and color changing by color filters. (2) Luminance contrast of the illuminated bridges affects 'modeling' and 'spare sense' of bridges, and it might improve people's preference and impression. (3) Color temperature of the illuminated bridges is influenced by 'color of bridge', 'material of bridge' and, 'color temperature and color of light sources'. (4) 'Structure of bridges' and 'luminaires' influence on the physical feature of the bridges. Especially, illumination of the bridges shows resemblant patterns by 'structure of bridges'.

육지초인용 고광도 LED 대형등명기 연구 개발

  • Song, Sang-Bin;Ju, Jae-Yeong;Sin, Gyeong-Ho;Lee, Dong-Hui;Kim, Sang-Yu;Yu, Seong-Hwan
    • Proceedings of the Korean Institute of Navigation and Port Research Conference
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    • 2015.10a
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    • pp.322-323
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    • 2015
  • Traditional rotation type large beacon was characterized by frequent failure, long repair time and high cost etc. These problems are caused by traditional light sources(metal halide lamps or tungsten halogen lamps). In order to solve these problems, IALA standards-based(efficiency and reliability) large LED beacon technologies are needed. we developed by applying a LED. The object of the this project, to design a reflective optics and the high power LED lighting engine module. And to develop a rotational speed control system for controlling flash pattern of beacon. As a result, to develop of LED beacon for landfall mark that distance to reach the light 20NM to 27NM.

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