• Proceedings of the KIEE Conference
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• 2009.07a
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• pp.1353_1354
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• 2009

The OTFT devices had inverted staggered structures of Au/pentacene/ppMMA/ITO on PET substrate. The overall device performances of the flexible devices such as the operating voltage, the field effect mobility, the on/off ratio and the off current are somewhat worse than those of devices fabricated on glass substrates. Pentacene/ppMMA OTFT benchmarks (mobility, sub-threshold slope, on/off ratio) were comparable to that of solution cast PMMA, but below average when compared to other polymer gate dielectrics. However, threshold and drive voltages were among the lowest reported for a polymer gate dielectric, and surpassed only by ultra-thin SAM gate dielectrics.

• Natural Product Sciences
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• v.10 no.6
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• pp.341-343
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• 2004

A monoacyldigalactosyl glycerol was isolated from the $CH_2Cl_2$ soluble fraction of the MeOH extract from the green alga Enteromorpha prolifera. The structure was established as $1-O-palmitoyl-3-O-[{\alpha}-D-galactopyranosyl(1{\rightarrow}6)-{\beta}-D-galactopyranosyl]-sn-glycerol$ (1) by chemical and spectroscopic methods.

• Korean Journal of Pharmacognosy
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• v.40 no.4
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• pp.334-338
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• 2009

Six iridoids were isolated from the 70% ethanol extract of Lonicera Caulis (Caprifoliaceae) and their structures were identified as epialyxialactone (1), secologanin dimethyl acetal (2), sweroside (3), loganin (4), loganic acid (5) and demethylsecologanol (6). The chemical structures of these compounds were identified on the basis of spectroscopic methods and comparison with literature values. This is the first report of the iridolactone, epialyxialactone (1), from the Caprifoliaceae plants and loganic acid (5) and demethylsecologanol (6) from Lonicera Caulis.

• Journal of the korean veterinary medical association
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• v.27 no.4
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• pp.235-241
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• 1991

In this fundamental study of autors observed on the general composition of raw milk of Holstein in Korea for Veterinary Public Health Science. It is hope that the information will be used for reference in the future endearvors of study in the field of vet

• Proceedings of the Korean Vacuum Society Conference
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• 2013.02a
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• pp.666-666
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• 2013

CIGS solar cell에서 p-type semiconductor역할을 수행하는 Cu(In,Ga)Se로 이루어진 Absorber layer는 4 element multi binary compound로 stoichiometry 측면에서 다양한 형태가 나타나기 때문에 태양전지 효율을 향상시키기 위해 이에 대한 연구가 활발하다. 우리는 E-beam evaporation 방법으로 다양한 조건의 multi layer로 증착된 CIG layer 위에 일정 두께의 Se을 증착하면서 열처리 조건에 따른 Selenization 메커니즘에 대한 연구를 수행하였다. 결과분석을 위해(in-situ High Temperature) XRD, XPS, Micro Raman spectroscopy, FE-SEM, (Nano Indentor, Atomic Force Microscopy) 등을 이용하여 결정구조, 결정화도, Depth profile, Eg (band gap energy) 등을 알아보고 분석결과간의 상관관계를 고찰하였다.

• Journal of Astronomy and Space Sciences
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• v.5 no.1
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• pp.53-56
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• 1988

UBV photometric monitoring of Eps Aurigae has been made at Yonsei University Observatory since the 1982-1984 eclipse. Among observatios made in four seasons(1984-5, 1985-6, 1986-7, 1987-8) after the 1982-84 eclips ended the observations of the latest season are presented. Standardized UBV light curves of Eps Aur exhibit a light variation in a semi-regular fashion with the amplitudes of 0.12, 0.19, and 0.29 for V, B, and U, respectively. Duratiohs of this light variation may show a color dependency with the mean value of about 78 days whose minimum light on near JD2447118.

• Proceedings of the KIEE Conference
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• 2007.10c
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• pp.192-194
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• 2007

교토의정서 발효 후 유럽을 중심으로 한 선진국에서는 온실가스 배출권거래제를 국제사회에 보급함으로서 경제적 이익을 창출하고자 한다. 우리나라의 이산화탄소배출량은 세계 상위권 수준이며 이에 대한 대책이 절실히 필요한 시점이다. 철도선진국은 전 세계적으로 대두되고 있는 지구온난화문제를 신속하고 적극적으로 대처하고 있으나 국내 철도부분에서의 온실가스배출저감에 대한 대응은 미흡하다. 본 논문은 현재 철도분야의 대응방안, 철도급전시스템에서 신재생에너지를 이용한 에너지 대체방안과 에너지절약 방안 등을 다룬다.

• Proceedings of the Korean Information Science Society Conference
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• 2011.06a
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• pp.194-197
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• 2011

소프트웨어 아키텍처 (Architecture)를 설계하는데 있어서 소프트웨어의 품질속성(비기능)을 반영하는 것은 중요한 일이다. 하지만 품질속성은 정성적으로 분석되기 때문에 아키텍처 설계에 명확히 반영하고 구조화하는 것은 어려운 일이다. 따라서, 본 논문에서는 QAW(Quality Attribute workshop) 방법론을 통하여 도출된 품질속성들을 기반으로, 아키텍처를 설계하는 ADD(Attribute Driven Design) 방법론을 임베디드 소프트웨어 환경에 맞게 재구성하였다. 임베디드 소프트웨어 환경에 적합하게 수정된 프로세스(Process)와 적용된 실제 사례를 소개하였다. 또한 적용 결과를 바탕으로 향후 개선 방향을 도출하였다.

• Journal of Astronomy and Space Sciences
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• v.30 no.2
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• pp.113-121
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• 2013

Heumgyeonggaknu is a water-hammering type automatic water clock which was made by Jang Yeong-Sil in 1438. The water clock that is located in Heumgyeonggaknu consists of Suho which is equipped with 2-stage overflow. Constant water wheel power is generated by supplying a fixed amount of water of Suho to Sususang, and this power is transferred to each floor at the same time. The 1st floor rotation wheel of Gasan consists of the operation structure which has the shape of umbrella ribs. The 2nd floor rotation wheel is made so that the 12 hour signal, Gyeong-Jeom signal, and Jujeon constitute a systematic configuration. The 3rd floor rotation wheel is made so that the signal and rotation of Ongnyeo and four gods can be accomplished. Based on the above conceptual design, this paper analyzed the internal signal generation and power transmission of Heumgyeonggaknu.

• Journal of Astronomy and Space Sciences
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• v.34 no.1
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• pp.55-65
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• 2017

We studied the hour-lines of six extant Yangcheon-cheoks in Korea. To find whether Yangcheon-cheok was used in the whole area of Korea, we calculated the length of shadows of Yangcheon-cheok on the Korean Peninsula, Nanjing and Beijing as well as Hanyang (Seoul), according to 24 solar terms. Comparing the length of shadows with hour-lines of those relics, we could find that Yangcheon-cheok was suitable for use at limited times (from 9:00 to 15:00) during the year. Also, this sundial is more appropriate for use at low latitudes than high ones. Among existing relics, that of Seoul Museum of History made with porcelain was much more suitable to use at Hanyang and its higher latitude. Lee's collection was also suitable to use at Nanjing. It is certain that Yangcheon-cheok was a portable sundial which could be used from nine to fifteen of clock all the year around except for the winter season.