• Proceedings of the Optical Society of Korea Conference
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• 2004.07a
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• pp.190-191
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• 2004

• Journal of Microbiology and Biotechnology
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• v.21 no.10
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• pp.1081-1087
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• 2011

An internally radiating photobioreactor was applied for the production of astaxanthin using the unicellular green alga Haematococcus pluvialis. The cellular morphology of H. pluvialis was significantly affected by the intensity of irradiance of the photobioreactor. Small green cells were widespread under lower light intensity, whereas big reddish cells were predominant under high light intensity. For these reasons, growth reflected by cell number or dry weight varied markedly with light conditions. Even under internal illumination of the photobioreactor, light penetration was significantly decreased as algal cells grew. Therefore, we employed a multistage process by gradually increasing the internal illuminations for astaxanthin production. Our results revealed that a multistage process might be essential to the successful operation of a photobioreactor for astaxnthin production using H. pluvialis.

• 한국정보디스플레이학회:학술대회논문집
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• 2005.07b
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• pp.1607-1610
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• 2005

A new configuration of LCD projectors for polarized stereoscopic projection having no light loss in the polarization process is suggested. In the proposed system, two polarizing filters that are employed in the conventional LCD polarized stereoscopic projection system causing additional light loss and image distortion are excluded by taking into account of polarization property of the LCD projector and image processing techniques. From some experimental results by using the Type-1 LCD projectors, light loss of the proposed system occurring in the polarization process is found to be zero.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2003.07b
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• pp.1082-1085
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• 2003

본 연구에서는 고분자를 사용하여 만든 유기EL소자인 PLED (Polymer Light Emitting Diode)의 제조공정 변화에 따른 소자성능을 연구하였다. PLED의 제작은 크게 ITO 기판 제작, 발광층 및 전극 증착 등의 공정으로 나누어진다. ITO 기판은 사진식각공정으로, 발광층의 증착은 스핀코팅법으로, 전극은 진공증착법으로 각각 제작하였다. 코팅 시 스핀속도 및 점도 조절을 통하여 발광층의 두께를 조절하였고, 스핀코팅 후 건조방법에 따라서 표면의 uniformity와 발광특성을 비교해 보았다. 실험결과 특정 두께에서 발광특성이 우수하게 나타나는 것을 확인할 수 있었다. 그리고 건조방법에 따라 발광층의 표면 uniformity에 차이가 있었으며, 표면 uniformity에 따라 diode의 I-V 특성 경향이 달리 나타났다.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2005.05b
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• pp.37-40
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• 2005

Light reflectance and arc resistance of PTFE composites were investigated. PTFE composites have been used widely as a material for circuit breaker nozzle. Arc energy is transported to the nozzle material by radiation. It is needed to add some fillers to PTFE to avoid energy penetration into the nozzle material. In this paper, some fillers that have endurance in the high temperature arc environment were added into PTFE. The light reflectance and arc resistance of PTFE composites according to the kinds and content of fillers were investigated.

• Journal of the Optical Society of Korea
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• v.19 no.6
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• pp.586-591
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• 2015

In recent years, along with the rapid development of LED technology, indoor positioning systems based on visible light communication (VLC) have been researched. In this paper, we propose an accurate indoor positioning method using white-light LEDs and a dual image sensor. Indoor LED lights are located at the ceiling in a room and broadcast information on their positions using VLC technology. A mobile device with a dual image sensor receives LED position information by VLC and estimates its position and azimuth angle. Simulation and experimental results are given to show the performance of the proposed indoor positioning system.

• Proceedings of the Korea Information Processing Society Conference
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• 2017.11a
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• pp.1241-1243
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• 2017

As the era of the fourth industrial revolution, renewable energy has been highlighted instead of fossil energy resource. Solar energy is constantly being developed in renewable energy, but energy gathering methods are not yet effective. In this paper, we study an efficient monitoring module for photovoltaic system for better performance of light sensor based solar tracking photovoltaic system with real time manner.

• 한국정보디스플레이학회:학술대회논문집
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• 2008.10a
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• pp.461-464
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• 2008

We have developed low voltage driving red phosphorescent organic light-emitting devices using a new electron transport layer. $Ir(piq)_3$ and CBP were used as a phosphorescent dopant and an emission host, respectively. The device exhibits a luminance of $1000\;cd/m^2$ at a voltage of 2.8 V. This high luminance at low voltage results from a high electron conduction behavior of the new electron transport layer.

• 한국정보디스플레이학회:학술대회논문집
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• 2006.08a
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• pp.990-993
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• 2006

We fabricated top emission organic light emitting diode (TEOLED) with transparent metal cathode Barium and Silver bilayer. Very thin Ba/Ag bilayer was deposited on the organic layer by thermal evaporation. This cathode shows high transmittance over 70% in visible range. And the device with a Ba-Ag has a low turn on voltage and good electrical properties.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2010.06a
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• pp.156-156
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• 2010

We have developed highly efficient blue phosphorescent organic light-emitting devices (OLED) with simplified architectures using blue phosphorescent material. The basis device structure of the blue PHOLED was anode / emitting layer (EML) / electron transport layer (ETL) / cathode. The dopant was partially doped into the host layer for investigating recombination zone, current efficiency, and emission characteristics of the blue PHOLEDs.