• Information Display
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• v.23 no.3
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• pp.22-29
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• 2022

• The Optical Journal
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• s.145
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• pp.31-35
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• 2013

최근 자동차에 사용되는 조명은 LED가 주를 이루고 있다. 자동차 실내조명, 계기판 등에 사용되는 내부 조명의 경우 대부분 LED를 적용한 제품이며, 헤드램프, 후방 램프 및 방향 지시등과 같은 외부 조명의 경우도 LED로 교체되고 있다. 특히 LED 기반 헤드램프의 경우 과거 3500cc 이상 승용차 등에 한정되었으나 현재는 그 이하 레벨의 승용차 및 SUV 차량으로 범위가 빠르게 확산되고 있다. 고효율, 긴 수명 및 빠른 응답 속도가 장점인 LED를 차량용 조명 광원으로 사용함으로써 기존 할로겐램프나 HID 광원의 대체재로서의 전환이 활발히 이루어지고 있다. 할로겐램프의 경우 청색보다 적색 파장의 광량이 많은 관계로 황색에 가까운 백색을 보이며, HID 램프의 경우 할로겐램프보다는 백색 계열에 더 가깝다. 하지만 LED 램프는 파장의 순도가 높아 보다 완벽한 백색 구현이 가능하다. 또한 단순한 기능을 지닌 헤드램프에서 지능형 헤드램프로의 발전이 빠르게 이루어지고 있다. 이에 따른 LED의 수요 또한 증가할 것으로 예상된다. 향후 고효율 LED 소자의 개발과 함께 자동차용 LED 조명에 대한 적용은 급속도로 진행될 것으로 예상되며, 앞으로 자동차 조명 분야에서는 'LED 헤드램프/후미등 기술+IT 기술(센서+통신)'이 융합된 형태로 발전할 것이다. 본고에서는 LED 자동차 융합 기술 동향 및 전망에 대해 자세히 기술하였다.

• Korean Chemical Engineering Research
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• v.52 no.1
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• pp.8-16
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• 2014

Microalgae have been considered as a promising microorganism in the field of bio-industry due to their abilities to fix carbon dioxide as well as biosynthesize valuable secondary metabolites. Of many lighting sources for microalgal cultivation, LED (Lighting Emitting Diode) has been emerged as the appropriate choice with multiple advantages over the conventional bulbs. However, it is only in recent years that we have witnessed the possibility of application of LED into microalgae cultivation system. LED will serve as an evolutionary lighting source for microalgae cultivation system and open the frontier for integrative bio-industries. In this paper, we present the comprehensive review on the recent trends of LED applications into microalgal biotechnology.

• Proceedings of the Korean Society of Broadcast Engineers Conference
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• 2012.11a
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• pp.81-84
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• 2012

이 논문은 LED 조명을 방송용 광원으로 실용화하는 과정에서 필수적으로 고려해야 할 기술적 측면에 대한 고찰이다. 방송용 LED 광원의 실용화를 위한 기술적 개발은 사실적이고 자연스러운 영상, 특히 방송 영상의 대부분을 차지하는 인물의 얼굴색을 사실적으로 재현하는 것을 목표로 한다. 이 목표를 달성하려면 LED 조명의 고효율과 분광분포 특성이 최대한으로 자연광에 가까워야 한다. LED를 스튜디오 방송조명의 광원으로 활용하기 위해서는 조도, 연색성, 색온도, 색공간, 디밍 커브, 배광 곡선, 소음과 관계한 구체적인 기술적 특성이 요구되고 있다.

• Korean journal of applied entomology
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• v.61 no.4
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• pp.615-622
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• 2022

In this study, we sought to determine an appropriate LED light source that can be applied for the quality control of Aphidius colemani. Four LED light sources (385, 405, 450, and 660 nm) were evaluated in a Y-tube experiment (choice test) using a 5,000-k white LED as a control. The 385 nm LED light source was found to have attractant effect on A. colemani. In a no-choice test (Y-tube experiment) evaluating the remaining three LED light sources (385, 405, and 450 nm), the attractiveness of these light sources for A. colemani was high in the order 450 nm > 385 nm > 405 nm light, with no statistically significant differences between 450 nm and 385 nm. Given that 385 nm LED illumination may cause skin damage, we selected 450 nm LEDs for application in a device used for the quality control of A. colemani, which we subsequently demonstrated to have an attraction rate of 87.4%. We believe the findings of this study will make a valuable contribution to the quality control of natural enemies.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.17 no.11
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• pp.368-375
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• 2016

This study examined the criteria for efficient LEDs used throughout the experiment of an LED with another light color growth to be used in a plant factory. The experiment was confirmed by measuring the Red-LED, Blue-LED, plant growth, and amount of carbon reduction in a White-LED environment. The white-LED showed a similar growth trend to the Red-LED. Blue-LED showed the lowest growth. Measurements of the carbon dioxide levels, showed that the Red-LED and blue LED produced the lowest levels. The combination of the ratio of the LED showed four Red-LEDs and one blue LED to be the higher of the two. In addition, three Red-LED and one Blue-LED produced equal growth to that of the white-LED. In addition, as much as possible, red is the light color that obtains the result suitable for plant factories.

• The Journal of Korean Institute of Communications and Information Sciences
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• v.25 no.4A
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• pp.573-578
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• 2000

This paper presents a noble optical access system using shared laser and LED light sources, which is based on WDM-PON technologies. This system adopts an external modulation of the shared laser sources for high-speed downstream and a direct modulation of the LED sources for low-speed upstream. To split or combine the transmission channels, AWG(Arrayed Wave-guide Grating) devices are used in the optical cable section. The proposed system is attractive for low cost implementation. The laser light sources can share the optical carriers in the downstream scheme. Also, in upstream, the LED sources can afford to make simple of the circuits for controlling light source and of standardization for ONU(Optical Network Unit). The feasibility of the proposed system is demonstrated by several experiments. Our results show that the system operates well at 2.SGbps for downstream and up to 622.08Mbps for upstream.

• Clean Technology
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• v.16 no.2
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• pp.88-94
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• 2010

The physiological roles of various wavelength of light emitting diode (LED) on ‘Hayward’ kiwifruit experiencing after-ripening were investigated. Various wavelengths from LED light source were irradiated on kiwifruits kept in plastic bags or under open air at $25^{\circ}C$. During two weeks of storage, firmness of Hayward kiwifruits was decreased by $25^{\circ}C$ treatment than by $4^{\circ}C$ treatment. In the $25^{\circ}C$ storage condition, the firmness of kiwifruits was decreased by the treatment of 380 nm UV and 470nm white LED light source. Sweetness of kiwifruits treated with 380 nm UV LED and dark condition at $25^{\circ}C$ increased higher than $15^{\circ}$Brix. The acidity of kiwifruits under open air was decreased 52% by incubating at $25^{\circ}C$ with 660 nm red LED treatment. The acidity of kiwifruits in plastic bags was decreased 52.6, 55.6, 52.8% by the treatment of 440 nm blue, 470 nm white and 660 nm red LED light source, respectively, compared to that of kiwifruits incubated in darkness at $25^{\circ}C$. Decreased acidity irradiated by 660 nm red LED light source can be applied for regulating periods of the kiwifruit after-ripening process. LED light sources emit very narrow wavelength with a power-saving mode, therefore, the usage of these LED light source for regulating the after-ripening process can be classified as a clean biotechnology producing safe and environment-friendly kiwifruits.

• Photonics industry news
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• s.29
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• pp.24-35
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• 2005

광 반도체 기술의 발달에 따라 LED/LD산업이 급속히 성장하고 있으며, 반도체, 디스플레이, 자동차, 가전, 통신, 인터넷 산업드의 유관산업에서 강점을 보유하고 있는 우리나라의 측면에서는 놓칠 수 없는 매우 중요한 시장이다. 선진국에서도 이러한 반도체 광원시장의 중요성을 일찍부터 깨닫고 국택사업의 차원에서 LED/LD 응용제품 기술개발을 지원하고 있으며, 국내에서도 차세대 성장동력으로 지정하여 연구개발에 많은 투자를 하고 있다.

• The Magazine for Energy Service Companies
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• s.65
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• pp.34-37
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• 2010

녹색성장의 핵심사업으로 대두되고 있는 것은 LED다. LED 광원은 백열등, 할로겐, 형광등을 대체할 뿐만 아니라, 휴대전화, 자동차, 대형 BLU, 경관조명 등 모든 분야에 적용할 수 있기 때문에 반도체 산업을 능가할 정도로 시장잠재력이 무궁무진하다. LED 기술력을 바탕으로 그린 IT 기술을 한 단계 끌어올리고 있는 국내 기업들. 그 중에서 LED 분야 전문기업인 서울반도체와 LED 조명 기술력을 갖춘 금호전기의 LED 경쟁력을 살펴보았다.