• Title/Summary/Keyword: Area Light

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Analyze the Results of Lighting Type Change and Rroposal of Power Density per Unit Area for Light Pollution Control of Channel-letter Type Advertisement Lighting (채널레터형 광고조명의 빛공해 관리를 위한 조명방식 개선효과 분석 및 단위면적당 소비전력(W/㎡) 제한 방법 제안)

  • Yoo, Seongsik;Kim, Hyun-Ji;Kim, Hoon
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.67 no.6
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    • pp.759-766
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    • 2018
  • Although the Act on the Prevention of Light Pollution Due to Artificial Lighting has been enforced since 2013, the area of advertisement lighting has made slow progress in solving the problems of light pollution. This paper first investigated institutional problems by analyzing domestic laws and regulations relating to the light pollution of advertisement lighting, and investigated and analyzed methods for reducing light pollution that were applied in overseas countries. Then, problems of light pollution were analyzed by conducting a research on the actual status of advertisement lightings installed in South Korea and applying various methods for reducing light pollution, and advertisement lighting using LED was recommended. As a method for reducing light pollution that can be applied to the process of manufacturing channel letter-type advertisement lights, power consumption per unit area ($W/m^2$) was proposed, and $100W/m^2$ was recommended as a value currently suitable for South Korea.

A Study on Light Guide Luminaire Design using Prismatic Film (프리즘 필름을 이용한 조명기구 설계 연구)

  • Jeong, Hak-Geun;Han, Su-Bin;Jung, Bong-Man;Lee, Euy-Jun
    • KIEAE Journal
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    • v.2 no.2
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    • pp.33-38
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    • 2002
  • There are a number of practical uses for devices which are capable of piping large amounts of light: illumination of areas where there would be maintenance, safety, or security problems with electronic light sources; piping sunlight into indoor areas for illumination; and the conversion of high luminous efficacy, good color quality, high intensity discharge lamps into more acceptable linear of area sources of light. Prism light guides are hollow structures which pipe light by means of total internal reflectin(TIR). These devices are unique in their ability to combine the efficiency of TIR with the relatively low cost of hollow structure. An important application stems from their ability to transform a point source of light such as an incandescent or discharge lamp into a linear or area source of light or illumination. We report the development of an economical, flexible prismatic film for fabricating the light guide wall. This guide geometries and films are currently under development.

Improving light collection efficiency using partitioned light guide on pixelated scintillator-based γ-ray imager

  • Hyeon, Suyeon;Hammig, Mark;Jeong, Manhee
    • Nuclear Engineering and Technology
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    • v.54 no.5
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    • pp.1760-1768
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    • 2022
  • When gamma-camera sensor modules, which are key components of radiation imagers, are derived from the coupling between scintillators and photosensors, the light collection efficiency is an important factor in determining the effectiveness with which the instrument can identify nuclides via their derived gamma-ray spectra. If the pixel area of the scintillator is larger than the pixel area of the photosensor, light loss and cross-talk between pixels of the photosensor can result in information loss, thereby degrading the precision of the energy estimate and the accuracy of the position-of-interaction determination derived from each active pixel in a coded-aperture based gamma camera. Here we present two methods to overcome the information loss associated with the loss of photons created by scintillation pixels that are coupled to an associated silicon photomultiplier pixel. Specifically, we detail the use of either: (1) light guides, or (2) scintillation pixel areas that match the area of the SiPM pixel. Compared with scintillator/SiPM couplings that have slightly mismatched intercept areas, the experimental results show that both methods substantially improve both the energy and spatial resolution by increasing light collection efficiency, but in terms of the image sensitivity and image quality, only slight improvements are accrued.

A Practical Study on Aids to Navigation (항로표지에 관한 실무적 고찰)

  • Yoon, Byoung-Won
    • Proceedings of the Korean Institute of Navigation and Port Research Conference
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    • 2007.12a
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    • pp.365-372
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    • 2007
  • The function of navigational aids are to be coincided with the development of navigational equipment and increase of traffics on the sea fairway. Supplementary function or side effect of wharf-edge illumination would be effective to indicate fairway indirectly and collision avoidance between ships and bridge against background light in port area at night also a serious-view light on the bridge posts would be effective to ensure the drifting ships by wind and current force adjacent bridge area.

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Growth Characteristics of Paprika Seedlings Affected by Different LED Light Qualities Raising Seedlings Using Rockwool Cube (암면큐브를 이용한 육묘에서 LED 광질에 따른 파프리카 묘의 생육 특성)

  • Lee, Se-Hyoung;Ko, Baul;Bae, Jong Hyang;Ku, Yang Gyu;Kim, Ho Cheol
    • Journal of Bio-Environment Control
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    • v.31 no.1
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    • pp.60-66
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    • 2022
  • This study was conducted to investigate growth characteristics of paprika seedlings according to various qualities of LED light (red : blue = 10 : 0, red : blue = 8 : 2, red : blue = 2 : 8, white). Plant height and stem were significantly longer or thicker as red light ratio increased. Leaf area of paprika seedlings with red light was larger or no significant differences in a mixed light of red and blue. Dry weight of seedling was in the same with the result of leaf area. Seedlings with White light was significantly less than others in all characteristics. As red light ratio was increased, relative growth rate increased. As blue light ratio was increased, the net assimilation amount increased. Considering plant height, leaf area and production ability of dry matter per unit leaf area, the using mixed red and blue lights was suitable, especially at a mixed red : blue = 8 : 2.

A Real-time Soft Shadow Rendering Method under the Area Lights having an Arbitrary Shape (임의의 모양을 가지는 면광원 하의 실시간 부드러운 그림자 생성 방법)

  • Chun, Youngjae;Oh, Kyoungsu
    • Journal of Korea Game Society
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    • v.14 no.2
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    • pp.77-84
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    • 2014
  • Presence of soft shadow effects from an area light makes virtual scenes look more realistic. However, since computation of soft shadow effects takes a long time, acceleration methods are required to apply it to real-time 3D applications. Many researches assumed that area lights are white rectangles. We suggest a new method which renders soft shadows under the area light source having arbitrary shape and color. In order to approximate visibility test, we use a shadow mapping result near a pixel. Complexity of shadow near a pixel is used to determine degree of precision of our visibility estimation. Finally, our method can present more realistic soft shadows for the area light that have more general shape and color in real-time.

Development of Ring Right for Medical Purpose (메디컬 링 라이트의 개발)

  • 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.766-767
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    • 2010
  • By using LED which is a light source which has been in the spotlight recently, the ring light for medical purposes was developed for shadowless shooting of local site in the affected area. The developed ring light was designed to be able to control the various quantity of light by using PWM (pulse width modulation) method, and by controlling each LED (light emitting diode) independently the regulation of color temperature and color rendering are possible. Also, the persistent light for continuous shooting of affected area and flash mode action for snap shooting are possible. In this study the response speed of momentary flash function was checked using interface circuit configured for momentary shadowless shooting of affected area.

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Effects of Red, Blue, White, and Far-red LED Source on Growth Responses of Wasabia japonica Seedlings in Plant Factory (식물공장에서 적색, 청색, 백색 및 원적색 LED 처리에 따른 고추냉이의 생육반응)

  • Kim, Hae Ran;You, Young Han
    • Horticultural Science & Technology
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    • v.31 no.4
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    • pp.415-422
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    • 2013
  • This study was conducted to establish the optimum LED light source and quality for growth of Wasabia japonica seedlings in the LED chamber plant factory system. The light treatments were combined with four colors LED (red, blue, white, far-red), irradiation time ratio of the red and blue LED per minute(1:1, 2:1, 5:1, 10:1), and duty ratio of mixed light (100%, 99%, 97%). The growth response of W. japonica was the greatest in the R + B mixed light treatment, and seedlings grown in the red LED alone was higher than blue LED alone in the monochromic radiation treatments. In the R + B mixed LED, 1:1 ratio of R and B was the best for total biomass and tiller production. In mixed light treatments, the growth response of W. japonica was highest in the 100% duty ratio with R + B mixed light, while that was highest in the 97% duty ratio with R + B + W mixed light. Leaf area and dry weight were increased in the red light treatment alone, while specific leaf area was increased in the blue light alone. With the increasing red LED light ratio, leaf area and dry weight of W. japonica was significantly increased under the R + B mixed light treatment. In mixed light treatments, the leaf growth responses of W. japonica was highest in the 97% duty ratio with R+B mixed light, while that was highest in the 100% duty ratio with R + B + W mixed light. For cultivating W. japonica in a plant factory, treating red LED supplemented with a blue light or higher ratio of the red to blue LED was benefit to promote the growth of W. japonica.

Research on the Characteristics of the Light Trespass using by RELUX Program According to the Spatial Position of the Road Lightings in Residential Area Near Road (조명시뮬레이션 프로그램(RELUX)을 이용한 도로조명의 공간적 배치에 따른 침입광 영향 특성 연구)

  • Gu, Jinhoi;Jung, Jong-Hwan;Lee, Kyumok
    • Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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    • v.26 no.11
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    • pp.1-8
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    • 2012
  • The road lightings have made our living environment safe and active, since it was first installed in 1900 in Korea. As the industry developed, various kind of road lightings have been installed in an outdoor area. But the spilt light from the road lightings have caused health problem like the sleeplessness, the depression, the failure to thrive and the nearsightedness to children. The light trespass caused by road lightings vary with the height of road lightings, the distance from road lightings to the window and the BUG rating of road lightings. In this paper, we analyze the effect on the light trespass by the spatial installation position of road lightings using by RELUX program. And we derive the characteristics of the light trespass according to the spatial installation position of the road lightings in residential area near road.

A Study on the Right of Light Impact at Adjacent Residential Area by High-rise Residential Commercial Complex Building (상업지역내 고층건물의 인접주거 지역 일조권 영향에 관한 연구)

  • Lee, Sang-Hwa;Lee, Kyoo-Seock
    • Journal of the Korean Society of Environmental Restoration Technology
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    • v.12 no.2
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    • pp.10-18
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    • 2009
  • In order to determine the violation of right of light impact at adjacent residential area by high-rise building, analysis on the right of light for high-rise residential commercial complex building block at Gahngnam-ku, Seoul, Korea was carried out using Google Sketchup Pro. After the analysis th sunshine duration of B apartment decreased from 5 hours 16 minutes 3 hours 48 minutes by I hour 42 minutes after construction. It shows that the total sunshine duration is less than the Seoul City Government Standard which is more than 4 hours a day, or more than 2 consecutive hours. Lowering the heights of apartments by 54m would increase the total sunshine duration which would meet the Seoul City Government Standard by four hours seven minutes. Problems that rna lead to the violation on the right of light in the adjacent area should be discussed in advance and minimized by analyzing the right of light among buildings and structures which are scheduled to be constructed on the site during construction penni! process when high-rise building is proposed.