• Journal of Astronomy and Space Sciences
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• 제22권3호
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• pp.233-242
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• 2005

66개의 근접촉쌍성(이하 NCBb)의 절대물리량과 궤도요소를 여러 목록으로부터 수집 분석하여 여러 물리량 사이의 상관관계와 NCBs의 물리적 특성을 조사하였다 NCBs의 질량비-광도비 관계는 $L_2/L_1{\lapprox}(M_2/M_1)^{1.45}$로 나타났으며 CE형에 더 근접한 특성을 보였다. NCBs의 여러 물리량 사이의 상관관계에 따르면 F형이 A형에 비하여 주성과 반성의 질량, 반경, 광도 및 온도의 차이가 작게 나타났다. NCBs의 H-R도에 따르면 A형이 F형에 비하여 다소 더 진화된 종년주계열(TAMS)에 가까이 나타나고 있다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1987년도 전기.전자공학 학술대회 논문집(I)
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• pp.260-264
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• 1987

Algorithms to detect in real-time both position and orientation of rectangular type electronic components are developed for industrial vision. In order to conduct detection in real-time, parallel processing algorithm of image date which uses several control processor is proposed. Image processing area is divided into several regions which can be processed by each cpu. As a result, processing time is improved when two control processors are used and real-time pattern recognition of not-well-aligned components is accomplished.

• 약학회지
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• 제44권4호
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• pp.334-339
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• 2000

The present study was carried out to evaluate biologically active components of the rhizomes of Sparganium stoloniferum and to supply the preliminary data for the chemotaxonomy and the medicinal application. Extraction and systematic fractionation of the rhizomes by column chromatography led to the isolation of six compounds from ethylacetate and n-butanol soluble fractions. Elucidation of the chemical structures of these compounds by physicochemical and apectral analysis demonstrated that compound I,II ,III,IV,V and Ⅵ were $\beta$-sitosterol, $\beta$-sitosterol-3-$\beta$-D-glucuronopyranoside, 3- (4-hydroxyphenyl)-2-propenoic acid, sorbose, 1-O-$\beta$-D-glucopyranosyl-(2S, 3R, 4E, 8Z)-2-[(2(R)-hydroxyeicosanoyl)amido]-4,8-octadecadiene-1,3-diol, and $\beta$-sitosterol-3-O-$\beta$-D-glucopyranoside, respectively.

• 기술혁신연구
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• 제24권1호
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• pp.1-24
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• 2016

본 연구는 2005년과 2007년에 시행한 중소기업기술통계조사에 모두 응한 중소기업 중 전자부품, 영상, 음향, 통신 장비 업체(KSIC 32) 142개사를 대상으로 외부 자원 활용과 흡수능력이 2년 후 경영성과와 혁신성과에 어떠한 영향을 미치는지, 또한 흡수능력이 이들 관계를 어떻게 조절하는지를 실증 분석하였다. 분석 결과, 공동기술개발 여부와 정부지원액으로 측정한 외부 자원 활용은 성과에 유의미한 영향을 미치지 않았고, 매출액에 대해서만 R&D투자비는 정(+)의, R&D인력비는 부(-)의 영향을 끼쳤다. 그리고 흡수능력의 조절효과는 측정방식과 독립변수에 따라 다르게 나타났다. 즉, 공동기술개발을 수행할 때의 성과는 R&D투자비가 증가할수록 향상했지만, R&D인력비는 반대로 작용했다. 그리고 정부의 자금지원이 늘어날수록 성과가 향상하는 기업은 R&D투자비가 낮거나 R&D인력비가 높은 기업이었다. 이러한 연구 결과는 중소기업의 외부 자원 활용이 내부 역량을 대체하지 못하며 오히려 흡수능력을 축적하여 외부 자원 활용의 효과를 극대화 할 필요가 있음을 보여준다. 또한, 공동기술개발을 수행할 때에는 중소기업의 적극적인 R&D투자가 필요하며 정부의 자금지원은 R&D인력을 보유하고 있으나 자금을 확보하지 못해 독자적인 기술개발이 어려운 기업에 더욱 효과적이다. 본 연구는 제한된 산업과 표본에서 이루어진 한계가 있지만, 종단적 자료를 통해 인과관계를 규명함으로써 기존 연구들의 한계를 극복하였다.

• Bulletin of the Korean Chemical Society
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• 제16권4호
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• pp.305-309
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• 1995

The enantiomeric separation of several amino acid derivatives by reversed-phase liquid chromatography using two (R)-and (S)-naphthylethylcarbamate-β-cyclodextrin(NEC-β-CD) bonded stationary phases was studied to illustrate the chiral recognition model of the enantiomeric separation. The retention and enantioselectivity of the chiral separations with (R)-and (S)-NEC-β-CD bonded phases were compared with similar separations with the native β-CD stationary phases. Especially, the enantioselectivity and elution orders between the derivatized amino acid enantiomers are carefully examined. These results can be illustrated by the chiral recognition models involving inclusion complexation, π-π interaction, and/or hydrophobic interaction. Inclusion complexation and hydrophobic interaction of the naphthyl group of the NEC moiety seem to be major chiral recognition components in the enantiomeric separation of 2,4-dinitrophenyl amino acids and dabsyl amino acids on (R)-and (S)-NEC-β-CD columns. For dansyl amino acids, only the inclusion complexation is the dominant factor. Three different chiral recognition models containing π-π interaction, inclusion complexation and hydrogen bonding were proposed for the separation of the 3,5-dinitrobenzoyl amino acid enantiomers, depending on the size and shape of amino acids.

• Natural Product Sciences
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• 제14권3호
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• pp.161-166
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• 2008

A mixture of sixteen cerebrosides, which comprised four cerebroside molecular species (PL-1 ${\sim}$ PL-4) was separated from the roots of Paeonia lactiflora. The structures of cerebrosides were characterized as $1-O-{\beta}$-D-glucopyranosides of phytosphingosines, which comprised a common long-chain base, (2S,3S,4R,8E/Z)-2-amino-8-octadecene-1,3,4-triol with eight fatty acids or 2-hydroxy fatty acids of varying chain lengths ($C_{16}$, $C_{18}$, $C_{20-26}$) linked to the amino group. Aralia cerebroside and its 8Z isomer (PL-1), $1-O-{\beta}$-D-glucopyranosyl-(2S,3S, 4R,8E/Z)-2-[(2'R)-2'-hydroxytetracosanoylamino]-8-octadecene-1,3,4-triol (PL-2), $1-O-{\beta}$-D-glucopyranosyl-(2S,3S,4R, 8E/Z)-2-[(2'R)-2'-hydroxydocosanoylamino]-8-octadecene-1,3,4-triol (PL-3), and $1-O-{\beta}$-D-glucopyranosyl-(2S,3S,4R, 8E/Z)-2-[(2'R)-2'-hydroxytricosanoylamino]-8-octadecene-1,3,4-triol (PL-4) were identified as major components of these cerebroside molecular species. All the major cerebrosides were shown to be a mixture of geometrical isomers (8E and 8Z) of phytosphingosine-type glucocerebrosides possessing 2R-hydroxy fatty acids. In addition, three ${\beta}-sitosterol$ derivatives and adenosine were also separated. The structures of these isolates have been determined on the basis of chemical and spectroscopic evidence.

• 기술혁신학회지
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• 제10권4호
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• pp.789-807
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• 2007

기술준비수준(TRL)은 미항공우주국(NASA)에서 1995년 처음 제안되었다. TRL의 정의는 하드웨어 및 소프트웨어 제품에 적합하도록 변형되어 사용되었다. 많은 국가 연구개발사업은 이와 유사한 평가기준을 가지고 있으나, 전문가의 개인적 역량에 따라 평가결과가 많은 영향을 받게 되며, 상대적으로 개발기술의 성능과 시작품의 신뢰성도 낮은 편이다. 본 연구의 목적은 부품소재사업에 TRL을 적용하는 것이다. 이를 위해서 부품소재사업에 적합한 TRL 개념을 정의하고, 기술 분야별로 세 가지로 나누어 구체적으로 다시 정의해 보았다. 이렇게 정의된 TRL 개념의 적용 가능성을 검토하기 위하여 2007년도 신규 제안서의 TRL을 평가하여 보았다. 이로부터, 부품소재사업 신청 과제들에 대한 TRL특성을 알 수 있었으며, TRL과 같은 객관적인 R&D사업 관리 요소 도입의 필요성을 인식할 수 있었다. 이를 위하여, 향후 기술 분류의 세분화를 통한 구체적인 TRL 판단기준을 개발하는 것이 중요한 요소이다.

• International Journal of CAD/CAM
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• 제6권1호
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• pp.199-211
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• 2006

Practical automated flat pattern generation with inbuilt production features for doubly curved sheet metal components (SMCs) is addressed here utilizing a new and unique Point Transformation Algorithm (PTA). This is the third in the series of papers on practical Flat Pattern Development (FPD) [8] and Production Loft Generation Systems (PLGS) [9] complementing the pioneering work [6,7]. In the first two publications, automated loft generation programs have addressed sheet metal components having a Principal Flat Surface (PFS) only. The flat pattern development of 3-D components that do not have the flat surface(termed as Non-PFS components) having complex features of double curvature in addition to cutouts and nibbled holes typical of aircraft components were so far not addressed due to lack of relevant published algorithms. This paper traces the evolution of developments and provides the record of fully illustrated, automated loft generation scheme for aircraft SMCs including the Non-PFS components which underwent validation through production tests by sponsors. Details of some of the unique features of the system like simplified surface model generation, termed as topological model and powerful algorithms deployed with potential for CAD/CAM applications are included.

• 한국축산식품학회지
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• 제35권6호
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• pp.715-720
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• 2015

This study was conducted to determine the effects of beak trimming, stocking density (D) and sex (S) on live weight (LW), carcass yield and its component, and plasma glucose (PG) and triglyceride levels in Large White turkeys. To accomplish this aims, totally 288 d old large white turkey chicks (144 in each sex) were used. Beaks of 77 male and female poults were trimmed when 8 d old with an electrical beak trimmer. The birds were fed by commercial turkey rasion. Experiment was designed as 2 × 2 × 2 factorial arrangement with 3 replications in each group. Beak trimming and stocking density did not affect live weight, carcass composition and its components. The higher LW and carcass weight observed in trimmed groups. As expected, male birds are heavier than female, and carcass percentage (CP) would be adverse. However, in this study, CP of male was higher in trimmed, in 0.25 m²/bird. (D) × sex (S) interaction had an effect on both CP and thigh weights (p<0.05). Significantly D × S was observed in LW, CP and PG. The weight of carcass and its some components were higher in male. S × D interaction had an effect on plasma glucose level (p<0.05). Triglyceride level was affected (p<0.05) by sex. Significant relationships were found between percentage of thighs (r=0.447, p<0.01) and percentage of breast (r=0.400, p<0.01). According to this study, it can be said that trimming is useful with density of 0.25 m²/bird in turkey fattening.

• 한국가스학회지
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• 제12권3호
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• pp.43-49
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• 2008

본 연구에서는 내경 4.3 mm와 6.4 mm의 수평동관내 R-22와 R-407C의 증발 열전달과 압력강하를 실험적으로 조사하였다. 냉매 순환루프의 주요구성품은 수액기, 압축기, 질량유량계, 응축기, 이중관식 증발기 (시험부)로 구성된다. 시험부는 내경 4.3 mm와 6.4mm의 평활 동관으로 이루어져 있다. 냉매질량유속은 $100\;kg/m^2s$에서 $300\;kg/m^2s$까지 변화시켰고, 증발기 냉매포화온도는 $5^{\circ}C$이다. R-22와 R-407C의 증발 열전달계수는 질량유속과 증기건도의 증가와 함께 따라 상승한다. 내경 4.3 mm와 6.4mm관내 R-22의 증발 열전달계수가 R-407C에 비해 각각 $7.3{\sim}47.1%$와 $5.68{\sim}46.6%$ 정도 높다.