• 한국진공학회지
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• 제4권S1호
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• pp.34-39
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• 1995

Various silicon films were prepared by thermal- and UV photo-CVD processes. The reactants were SiH4, Si2H6, SiH2F2, SIF4, and H2. Silicon films grown at temperatures below $500 ^{\circ}C$ were either amorphous or crystalline depending on the process conditions, and the growth rates ranged between 5 and $80\AA$min. Crystallinity of the film was improved even at $250^{\circ}C$ when the film was grown by photo-CVD using fluoro-silanes as the reactants. Analysis of the film by RBS, SIMS, XRD, and ex-situ IR indicated that substrate surface was contaminated by oxygen and other impurities when the reactants contained neither hydrogen nor fluoro-silnanes, but when fluoro-silanes were used as reactants the silicon film was highly crystalline.

• 한국염색가공학회지
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• 제21권5호
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• pp.16-20
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• 2009

Films of Poly(ethylene oxide), PEO, were modified to impart hydrophilicity via UV irradiation. The UV irradiation treatment produced new photo-oxidized groups of carbonyl and ether groups as indicated in ATR and ESCA analysis. It was found that water contact angle decreased from $15^{\circ}C$ to $10^{\circ}C$ and total surface energy of PEO increased from 54.2 mN/m to 76.6 mN/m with increasing UV energy, which was attributed to significant contribution of acid base interaction of the photo-oxidized PEO rather than nonpolar interaction originating from the dominant increase in Lewis acid parameter. The increased hydrophilicity and surface energy were also proved by the decreased water wetting time.

• 한국안광학회지
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• 제6권1호
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• pp.81-85
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• 2001

색각은 광 수용체인 3개 R. G. B cone의 파장흡수와 대립과정의 r-g, y-b 채널에 의해 이루어진다. 전기적 회로에 의한 색각 이상 mechanism은 photo cell, relay switch, transformer로 구성하였다. 추체(cone)의 R 또는 G가 결손 된 경우 y-b chromic valence 함수가 되고, 추체의 B가 결손 된 경우는 r-g chromic valence 함수가 되어 색각 이상 mechanism을 잘 적용된다.

• 한국정보과학회논문지:컴퓨팅의 실제 및 레터
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• 제16권12호
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• pp.1269-1273
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• 2010

일반적으로 사용자는 휴대폰에서 촬영한 개인용 사진 컬렉션에 대하여 이벤트 기준으로 관리 및 접근하는 것을 선호한다. 본 논문에서는 휴대폰상의 개인용 사진 컬렉션에 대하여 계산 량이 적고 정확도가 높으며 증감적인 클러스터링을 지원하는 이벤트 클러스터링 알고리즘을 제안하였다. 제안한 방법은 실제 샘플 사진들을 수집하여 이벤트 내의 사진들의 시간 경과 치에 대한 통계적 분석을 통하여 이벤트 경계 구간을 결정하였으며, 시간 정보만으로 분할이 모호한 구간에서는 위치 정보와 시각 정보를 사용하여 보완하였다. 본 논문에서는 제안한 방법에 대하여 실험 및 검증을 수행하였으며, 기존의 일반적인 클러스터링 방법에 비하여 높은 성능을 나타내는 것을 확인하였다.

• 전자공학회논문지 IE
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• 제46권4호
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• pp.8-15
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• 2009

본 논문은 CMOS 이미지센서 SPICE 회로 해석을 위한 포토다이오드 및 픽셀 모델링을 나타내었다. 소자 시뮬레이터인 메디치(Medici)를 이용하여 입사광의 세기에 따른 광전류 특성을 확보하고 SPICE 시뮬레이션에서 활용하기 위한 SPICE용 포토 다이오드 모델을 개발하였다. 그리고 그 결과를 검증하기 위하여 포토다이오드와 NMOS로 구성된 시험용 회로구조에 대한 메디치(Medici)의 mixed mode 시뮬레이션 결과와 SPICE 시뮬레이션 결과를 비교하였다.

• 센서학회지
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• 제17권1호
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• pp.41-52
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• 2008

In this paper, a circuit analysis of the complementary CMOS active pixel and readout circuit is carried out. Complementary pixel structure which is different from conventional 3TR APS structure is consist of photo diode, reset PMOS, several NMOSs and PMOSs sets for complementary signals. Photo diode is modelled with Medici device program. HSPICE was used to analyze the variation of the signal feature depending on light intensity using $0.5{\mu}M$ standard CMOS process. Simulation results show that the output signal range is from 0.8 V to 4.5 V. This signal range increased 135 % output dynamic range compared to conventional 3TR pixel in the condition of 5 V power supply.

• 조명전기설비학회논문지
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• 제28권8호
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• pp.106-112
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• 2014

This paper presents the analysis of connected operation of photo voltaic source and Li energy storage system. The micro-grid has been installed and operated for several years at the campus of USF and has been a role of test bed. Photo voltaic source has been strongly influenced by the location, weather and climate of a installed area and Li battery is connected directly to the photo voltaic source to compensate for the limitations. The Li battery is operated to supply power output to the grid by the charging or discharging mode based on the average power output of the PV source which is calculated from monitored data for several years. The load of the PV and Li battery system is operated as a severe loading condition and the operating characteristics of PV source and Li battery are analyzed in detail. In connected operations of PV and Li battery to power system, the PV and Li battery is operated to supply constant power during only day time or peak time to increase load shedding ratio and efficient usage of generation sources in power system.

• 한국조경학회지
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• 제35권4호
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• pp.105-118
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• 2007

The purpose of this study is not only to compare between 'Opened Landscape' and 'Filtered Landscape' image and preference but also to suggests a guide line of planting design for progressive realization. For this, the image structures of photo-sketch simulation for parallax landscape have been investigated by Semantic Differential scale(S.D. scale) and the Factor analysis. The results could be summarized as follows. The results of S.D. scale values for landscape through parallax were greater than non-parallax landscape. The scenes through parallax were better preferred to direct view. Thus the results of photo-sketch simulation test support the expected hypothesis that the visual environment of complexity and variety is closely correlated with the parallax effect and monotonous or non-parallax environment, and parallax effect on close view more bigger than the distant view. Factors covering the spatial image of parallax landscape were found to be seven and Total values were 60.35 %. The most important factors determining the parallax effect were Factors I 'depth of space' and VI 'expectation of space and interest'. An outstanding view must be handled properly to be preserved or accentuated. In this sense, the parallax spatial beauty with tree could be improved through the visual aspects of plan arrangements and the progressive realization appeared to be one effective design technique for landscape planning and design.

• 한국수소및신에너지학회논문집
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• 제22권5호
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• pp.741-748
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• 2011

Hydrogen is clean and renewable, and recognized as a very promising energy resource to solve both depletion of petroleum and environmental problems caused by the use of fossil fuels. Extensive researches have been performed worldwide on the production technologies of hydrogen. In this paper, the technology trend of photo-electrochemical (PEC) hydrogen production was scrutinized based on the patent and paper analysis. Open/registered patents of US, JP, EP, and KR and SCI Journals related to the PEC hydrogen production technology between 1996~2010 were reviewed. Patents and papers were gathered by using the key-words searching method and filtered by desirable filtering criteria. The technology trend was discussed by classifying each patent and paper based on the publishing year, country, and organization, and analyzing the core patents and papers.

• Bulletin of the Korean Chemical Society
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• 제25권12호
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• pp.1833-1839
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• 2004

Recently mass spectrometry and separation methods such as liquid chromatography have become major tools in the field of proteomics. In this report, we describe in detail our efforts to develop ultra-high pressure capillary reverse-phase liquid chromatography (cRPLC) and its online coupling to a mass spectrometer by a nanoelectrospray (nanoESI) interface. The RPLC system is constructed in house to deliver LC solvents at the pressure up to 20,000 psig, which is four times higher than conventional RPLC systems. The high operation pressure allows the efficient use of packed micro-capillary columns (50, 75 and 150 ${\mu}$m i.d., up to 1.5 m long). We will discuss the effect of column diameter on the sensitivity of cRPLC/MS/MS experiments and the utility of the developed technique for proteome analysis by its application in the analysis of proteome samples having different levels of complexity.