• Journal of The Korean Digital Architecture Interior Association
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• v.11 no.3
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• pp.61-67
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• 2011

This study examined the P Church in the Large chapel and S Church in the midium chapel were Analyzed to the installed stage broadcast lighting system. As a result of the installation of lighting equipment of LED class in P Church in the Large chapel, it provided clearer image and did not have shadow. While tungsten halogen illumination was very hot and heated to be preaching, LED was not heated so the pastor was very comfortable for preaching. S Church in the Midium chapel due to low ceiling height using LED lighting musical, theater and possibly were directed. If a similar structure of Dae-Hak Street theater to replace the existing fixtures by LED lighting, rendering effective and energy saving effect is thought to have much effect.

• The Journal of the Convergence on Culture Technology
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• v.1 no.1
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• pp.87-90
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• 2015

Find out about the Status and future direction of the latest special lighting, through the installation of special lighting for worship practices used in religious institutions. by applying the LED installation practices, Looked for in the past with other functional features. When replacing halogen lighting with LED lighting, According to the illumination economic evaluation, Confirmed, to be an approximately 25% reduction in the applicable. with functional factors of LED luminaires the feed will be applied more in the future.

• 한국정보디스플레이학회:학술대회논문집
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• 2006.08a
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• pp.1090-1092
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• 2006

There is provided white light illumination system including a radiation source, a first luminescent material having a peak emission wavelength of about 575 to about 620 nm, a second luminescent material having a peak emission wavelength of about 495 to about 550 nm, which is different from the first luminescent material and a third luminescent material having a peak emission wavelength of about 420 to about 480 nm, which is different from the first and second luminescent materials. The LED may be a UV LED and the luminescent materials may be a blend of three phosphors. A human observer perceives the combination of the blue, green and red phosphor emissions as white light.

• Proceedings of the Korean Society of Computer Information Conference
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• 2019.01a
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• pp.357-358
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• 2019

본 논문에서는 조도센서와 마이크로웨이브센서 기반의 협력제어를 통하여 기존대비 35%P 전력절감이 가능한 에너지 절감형 스마트 LED 조명시스템에 대하여 기술하였다. 제안된 시스템은 센서모듈과 LED조명, 무선전송 모듈이 분리된 형태로 인지기반 조명 제어를 통하여 ESCO 사업에 적합한 에너지 절감형 융합 조명 시스템에 다양하게 활용될 수 있다.

• Journal of the Korean Institute of Electrical and Electronic Material Engineers
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• v.22 no.12
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• pp.1033-1038
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• 2009

Recently, Light Emitting Diode (LED) has many advantages in comparison with conventional light sources; low power consumption, long lifetime, and less environmental pollution. Therefore, the use of LED is increasing rapidly. In general, however, spherical lens is used in LED-lighting which cause many problems induces by optical aberration of spherical lens; low illumination, yellow belt, unpleasant feeling in human eye. As a solution of these problem, aspherical lens can be employed. This study reported the improvement of LED-lighting performance by adopting aspherical lens. From the commercial program, $LightTools^{TM}$, the optical problem were ensured. And then, to improve these problem, optimum aspheric form was designed using Code $V^{TM}$.

• Proceedings of the KIEE Conference
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• 2008.10b
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• pp.522-523
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• 2008

This paper presents an LED lighting which can control its color temperature. It consists of a power factor correction (PFC) circuit, an LED driver, and an LED color control circuit. The proposed system can adjusts the light intensity to obtain a desired color with independently changeable illuminance. The power factor of the PFC circuit is 98%. The LED driver has 90% efficiency at 300mA output current. The output power of the experimented LED lighting is 150 W. The achieved color temperature range was from 3000K to 7500K, and the illumination one was from 500 lux to 1500 lux.

• Proceedings of the KIEE Conference
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• 2005.10b
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• pp.508-510
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• 2005

In this paper, we have studied for the current control method with high accuracy for the high power LED driver that is necessary to the lighting system using LEDs. The control performance of LED driver can be improved with the adjustment of current control boundary by introducing D/A converters for setting high-offset and low-offset. And microprocessor (ATmega128) and D/A converter with 8 bits resolution are used in the proposed driver so that LED's illumination can be remotely controlled by serial communication on the spot or by key input. In the results of performance tests, we confirmed that the proposed control method is superior to the conventional control method using op-amps.

• Journal of Industrial Technology
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• v.29 no.B
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• pp.187-191
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• 2009

Recently, we have used LEDs to illumination because it has a high luminous efficiency and prolong lifespan. However the light power and lifetime is reduced by junction temperature increment of LED. So it is important to measure the junction temperature accurately. In case of using a electrical method measuring junction temperature of LED. Temperature measurement errors are spontaneously generated because of a parasitic capacitances in LED. In this paper, we proposed a method that reducing LED's parasitic capacitance effects for electrical measurement. It was demonstrated by the experimental result that is more correct than established method.

• Journal of Sensor Science and Technology
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• v.24 no.3
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• pp.145-150
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• 2015

We introduce a new method of time-division visible light communication (VLC) using LED lamp light for the generation of synchronizing pulses. The LED lamp, driven by an AC 220-V power line, radiates light that has a 120-Hz frequency component. The pulse generator in each VLC system receives the LED lamp light and generates the synchronizing pulses that are required for time-division transmission of multiple VLC channels. The pulse period is subdivided into several time slots for VLC channels. In experiments, 120-Hz synchronizing pulses were generated using LED lamp light, and three VLC channels were transmitted independently without interfering with each other in a condition where the VLC signals overlapped in space. This configuration is useful in constructing multiple wireless sensor networks that are safe and without interference in locations where LED lamps are used for illumination.

• Proceedings of the Korea Information Processing Society Conference
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• 2016.04a
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• pp.766-769
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• 2016

산업시설 가운데 화력발전소에 스마트 부하관제 시스템을 이용하여 메탈 조명을 LED 조명으로 대체하여 전력을 절감하였다. LED 조명의 빛의 세기를 조절 할 수 있는 디밍을 통해서 사용자의 다양한 요구사항을 반영할 수 있다. 수요 예측은 전력 사용량이 많은 시간대의 전력사용량을 분산시키는 시스템이다. 수요 예측 스케줄에 의해서 목표전력량에 도달하기 위해 설정된 시간대에 디밍으로 LED 조명의 전력량을 조절하여, 기존 LED 조명 대비 전력량을 27.8% 절감하였다. 외부에 눈과 비가 오거나 밤에 실내가 어두워져서 작업 환경에 영향을 미치는 경우가 있다. 실시간으로 조도를 측정하여 작업 환경이 원활한 기준조도에 맞도록 LED 조명을 디밍 하여 작업환경을 개선하였다.