• Broadcasting and Media Magazine
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• v.21 no.1
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• pp.41-50
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• 2016

비디오의 사실감을 극대화하기 위하여 근래에 HDTV에서 지원하는 명암비(Dynamic Range)보다 넓은 고명암비(HDR, High Dynamic Range)를 제공하기 위한 다양한 연구 및 표준화가 활발하게 진행되고 있다. 본 논문에서는 HDR 신호 처리를 위해 가장 중요한 요소인 광전 및 전광변환 기술과 관련 표준화 동향을 살펴보고자 한다.

• Journal of the Korean Vacuum Society
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• v.22 no.4
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• pp.193-197
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• 2013

In order to investigate the photo-electric property in $VO_2$ film grown by a sol-gel method, the currents generated by the light irradiation and nonirradiation were measured as functions of the bias voltage and the temperature. From the result, the generated current in the film changed with the light irradiation and nonirradiation, and it gradually increased with the bias voltage. In particular, the maximum current was generated at $50^{\circ}C$ under the light irradiation; the temperature is lower comparing the MIT (metal-insulator transition) temperature in $VO_2$. This result indicates that $VO_2$ shows the photo-voltaic effect, and so that, it is expected that the $VO_2$ film is applied for a photo-voltaic device.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.25 no.2
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• pp.126-130
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• 2011

Transparent conductive oxide (TCO) is an important part in the construction of dye-sensitized solar cells (DSCs) because of its low sheet resistance, sufficient light transparent ability and high photoelectrical response as a porous photo-electrode material of DSCs. However, the use of TCO for the two DSC electrodes can result in significant cost increase for the less effective DSCs compared to Si based solar cell. Therefore, the replacement of TCO is required for the commercial production of DSCs. In this study, TCO electrodes are replaced by stainless steel mesh. The 3.44[%] efficiency of the prepared TCO-less DSCs sample was obtained.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2003.05a
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• pp.568-573
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• 2003

This paper describes a study of terrestrial digital TV transmission systems using wideband opto-electronic techniques such as electro-absorption modulators, wavelength division multiplex to support cost effective, high speed, flexible and interactive digital TV networks including ultra-high speed subscriber networks. In particular, the national DTV networks to be installed is required huge amount of cost. Therefore, the network should be carefully designed for DTV, communication and multimedia services in the future. In this paper, wideband optoelectronic DTV systems are suggested.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2005.07a
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• pp.79-80
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• 2005

In this paper, the circuit models of optical to electrical(O/E) characteristics of waveguide photodiode(WGPD) submodule are examined. Test structures of WGPD and WGPD submodule were fabricated and S21 parameter was measured to characterize the O/E conversion property. Valid circuit models were derived by RF circuit simulation and O/E characteristics were modeled to analyze the effects of model parameters on the WGPD submodule performances. Based on the results, it can be concluded that the suggested WGPD submodule model can explain the characteristics of the O/E conversion of WGPD submodule, where the parasitic components originated from ribbon bonding block crucially influence on the performance of WGPD submodule, are able to show more efficient property by making compact bonding structure. We propose an effective WGPD submodule bonding structure and it can ensure the 40Gbps operation of WGPD.

• Proceedings of the Korean Society of Computer Information Conference
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• 2011.06a
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• pp.273-276
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• 2011

우리는 감성 공학에 기반하여 일상 생활 속에서 비침습적이면서 사용하기 간편한 광전용적맥파신호를 계측하고 분석하는 이어폰형 생체 신호 측정 시스템에 관하여 연구하였다. 생체 신호 측정 시스템에서는 광전용적맥파(photoplethysmograph, PPG)와 3축 가속도로 생체 신호와 운동 신호를 활용하였다. 수신된 생체 신호인 광전용적맥파 신호는 Peak 검출 및 전처리 알고리즘을 통하여 심박동변동성(heart rate Variablity,HRV)에 대한 시계열 정보로 변환하고 고속 퓨리에 변환(Fast Fourier Transfirm, FFT)과 전력 스펙트럼 밀도 분석(Power Spectrum Density, PSD)방법으로 교감과 부교감 신경 활성도 변화를 관측하였고, 운동 센서로 움직임을 관측하였다. 수신부 시스템은 안드로이드 기반의 자바 어플리케이션으로 스마트 폰에서 구현하였고, 송신부인 이어폰 생체정보 측정모듈로 맥파를 측정하여 상황에 따라 변화하는 자율 신경계의 활성도비율을 확인하였다.

• Proceedings of the Korean Institute of Electrical and Electronic Material Engineers Conference
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• 2007.11a
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• pp.355-355
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• 2007

염료감응형 태양전지(Dye-sensitized Solar Cell; DSSC)의 에너지 변환효율을 높이기 위해 유리분말을 첨가하여 빛의 분산특성 및 빛의 이용률을 높이고 있지 알아보자고 실험을 하였다. 저온소성용, 고온소성용 두 가지 유리 분말을 각각 첨가한 경우 TiO2 광전극 박막표면에 유리분말의 잔류로 인한 영향을 X-RD로 분석 하였고 박막의 입자들의 형상변화와 분포를 알아보기 위해 FE-SEM으로 관찰하였으며 유리분말의 첨가량 별 광전류-전압 곡선으로부터 최적의 첨가량을 확인하였다.

• Ceramist
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• v.18 no.2
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• pp.34-44
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• 2015

• Journal of Korean Electronics
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• v.5 no.3
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• pp.104-107
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• 1985

• Electrical & Electronic Materials
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• v.27 no.8
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• pp.3-14
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• 2014