• 한국정보과학회논문지:데이타베이스
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• 제41권4호
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• pp.242-248
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• 2014

RDF 데이터가 급속히 증가함에 따라 RDF데이터로부터 정보를 효율적으로 추출하는 기술의 중요성도 점차 커지고 있다. RDF데이터 질의를 위해 가장 많이 사용하는 질의언어인 SPARQL은 문법이 간단하고 그래프 패턴을 손쉽게 질의로 표현할 수 있는 장점이 있다. 그러나 사용자가 적절한 SPARQL을 작성하려면 데이터 셋에 대한 온톨로지 구조와 용어를 사전에 파악해야 한다. 이 연구에서는 데이터 셋으로부터 사전에 추출된 스키마정보를 이용한 그래프 질의 생성 및 처리방법을 제안한다. 제안된 방법에서 사용자는 RDF 데이터 셋에 대한 온톨로지 구조 사전파악 없이 화면상에서 동적으로 질의를 작성하여 정보를 조회할 수 있다. 사용자가 생성한 질의는 관계형데이터베이스에 저장된 트리플 데이터에 대해 그래프 탐색을 수행할 때 탐색공간 제약조건으로 활용된다. LUBM(10,0) 데이터 셋에 대하여 LUBM 질의 2, 8, 9번을 이용하여 질의 처리 성능과 완전성을 확인하였다.

• 분석과학
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• 제5권3호
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• pp.303-308
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• 1992

Ti과 Si의 초기 반응이 Titanium Silicide의 표면 거칠기 (Surface roughness)를 고찰하기 위해 연구하였다. 형성기구는 In-situ AES와 LEED의 측정장비로 연구하였다. Ti의 하나나 두 원자층이 초고진공에서 원자적으로 깨끗한 Si 기판 위에 증착되었다. Reconstruction이 된 $7{\times}7$ Si(111) 표면이 초 고진공하에서 얻어졌으며 박막의 증착은 Quartz Crystal Oscillator로 측정되었다. In-situ 측정 결과 Ti과 Si의 초기 반응이 실온에서 일어났으며 Disorder막을 형성하였다. 낮은 온도($200^{\circ}C{\sim}300^{\circ}C$)에서 Ti과 Si의 Intermixing이 고찰되었고 $400^{\circ}C$ 근처에서 $1{\times}1$ Si(111) LEED 패턴이 관찰되었다. 이것은 Disorder막이 Order막으로 변화가 생긴 것을 나타낸다. 더 높은 온도에서 $7{\times}7$ Si(111) LEED 패턴이 재관찰되었는데 이것은 3차원적인 $TiSi_2$의 형성을 증명하는 것이다.

• 보험의학회지
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• 제3권1호
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• pp.103-141
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• 1986

The present study was undertaken to establish the decision standard of builds for the insured by using the ratio of weight-for-height as build index. Materials being examined were the ratio of weight-for-height being calculated from the actually measured heights and weights of a total of 15,838 insured persons who were examined medically at Honam Medical Department of Dong Bang Life Insurance Company, Ltd. from June, 1979 to September, 1985. The ratio of weight-for-height is calculated by the following formula. The ratio of weight-for-height(%)=$\frac{weight(kg){\times}100}{\{height(cm)-100\}{\times}0.9(kg)$ The results were as follows: 1. The distribution of the ratio of weight. for-height of the 15,838 insureds follows Log normal distribution being skewed to the left(the direction of underweight). 2. The ratio of weight-for-height were Log transformed to lead to a sym metrical pattern of distribution in which statistical rules are known to be applied more exactly. Thereafter, the establishment of dicision standard of builds was undertaken by using the log of the ratio of weight-for-height as build index. Through all ages in male, the ratio of weight-for-height indicating the range of standard lives including slight overweighted and underweighted lives besides normal lives is 80-130%, and corresponds to $"M-2{\delta}"-"M+1.5{\delta}"$ and to $M{\pm}20%$ ; in female, 85-135%, and corresponds to $"M-2{\delta}"-"M+1.5{\delta}"$ and to $M{\pm}20%$. Through all ages in male, the ratio of weight-for-height indicating the initial level of super-overweighted and super-underweighted lives is 130-150% and 75-80%,and corresponds to $M+3{\delta}\;and\;M-3{\delta}$ and to M+40% and M-25% respectively;in female, 140-160% and 75-80%, and corresponds to $M+3{\delta}\;and\;M-3{\delta}$ and to M+40%-+50% and M-25% respectively. 3. Author's rating table model for builds(a table of weight per height) is proposed. On the table, the ratings for builds, i. e. standard, super-weighted and super-underweighted lives, are listed.

• 응용통계연구
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• 제26권1호
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• pp.37-47
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• 2013

Q-Q 플롯은 자료에 대한 분포적 가정을 평가하기 위해서 사용되는 편리하고 효과적인 그래프 방법이다. Q-Q 플롯은 자료의 분포와 이론적 분포를 비교하기 위한 확률플롯으로 자료에서의 분위수와 이에 대응하는 이론적 분위수를 각각 수직축과 수평축으로 해서 그린 산점도의 형태를 취한다. 본 논문에서는 확률변수 X가 위치모수 ${\mu}$와 척도수 ${\lambda}$를 가지는 역가우스분포를 따르면, 변환된 확률변수 $Y={\mid}\sqrt{\lambda}(X-{\mu})/{\mu}\sqrt{X}{\mid}$는 평균이 0이고 분산이 1인 표준반접정규분포를 하게 되는 분포적 결과를 활용하여 역가우스분포 Q-Q 플롯의 구축방법을 소개한다. 역가우스분포와 다른 분포를 따르는 자료를 대상으로 그린 Q-Q 플롯에서 나타나는 점들의 형태를 알아보고자 모의실험을 수행하고 그 결과를 제시한다. 실제 자료에 대한 사례분석을 통해 제안한 Q-Q 플롯의 유용성을 보인다.

• 한국측량학회지
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• 제24권4호
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• pp.359-365
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• 2006

최근 강우에 의한 자연재해 발생은 특정지역에 발생하던 형태에서 전국 어디든 발생할 수 있는 형태로 변형되었으며, 이에 대한 피해도 날로 증가하고 있는 추세다. 이러한 재해발생은 사회경제적, 재정적, 물질적 및 인명손실에 많은 영향을 초래하고 있으며, 이를 위한 체계적인 관리기반 확립 및 시스템적 해결방안 제시를 위한 모델적립이 필요한 단계라 할 수 있다. 이에 본 연구에서는 재해의 유형을 분석하고 정리함으로서 보다 과학적이고 신속한 재해업무 계획 및 수립을 위한 시스템 설계를 실시하였으며, GIS기법을 활용함으로서 의사결정에 필요한 기초 자료를 제공하고자 한다. 또한, 각 시군에서 구축하고 있는 수치정사영상 및 수치표고모형을 활용하여 실제적 지형형태 및 상황을 분석하여 현황에 맞는 재해관리 업무 수행을 위한 관리시스템을 구축함으로서 현실적 사용에 근접한 관리시스템을 구축하였으며, 수치정사영상과 수치표고모형을 OpenGL을 이용하여 3차원 도시하고 단면분석 모듈을 개발하여 상황발생 부근의 지형형태 및 종단면을 화면에 도시하고 분석하도록 시스템을 구축하였다.

• 한국레이저가공학회지
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• 제17권1호
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• pp.1-6
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• 2014

Indium tin oxide (ITO) is an important transparent conducting oxide (TCO). ITO films have been widely used as transparent electrodes in optoelectronic devices such as organic light-emitting devices (OLED) because of their high electrical conductivity and high transmission in the visible wavelength. Finding ways to control ITO micromachining depth is important role in the fabrication and assembly of display field. This study presented the depth control of ITO patterns on glass substrate using a femtosecond laser and slit. In the proposed approach, a gaussian beam was transformed into a quasi-flat top beam by slit. In addition, pattern of square type shaped by slit were fabricated on the surfaces of ITO films using femtosecond laser pulse irradiation, under 1030nm, single pulse. Using femtosecond laser and slit, we selectively controlled forming depth and removed the ITO thin films with thickness 145nm on glass substrates. In particular, we studied the effect of pulse number on the ablation of ITO. Clean removal of the ITO layer was observed when the 6 pulse number at $2.8TW/cm^2$. Furthermore, the morphologies and fabricated depth were characterized using a optical microscope, atomic force microscope (AFM), and energy dispersive X-ray spectroscopy (EDS).

• 한국의류학회지
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• 제29권8호
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• pp.1168-1175
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• 2005

Clothing pressure has close relation with clothing comfort and depends on the pattern and properties of textile fabrics. Choosing a suitable clothing pressure is an essential factor for designing functional clothing such as the foundation for reshaping of a body contour or medical items for bum patient, and etc. However, it is hard to measure pressure values at the curved surface of a human body correctly. Recently, an air pack type pressure sensor, which has relatively excellent performance has been used to measure clothing pressure, however, it is still inconvenient to apply because it is a contact- type sensor. Therefore, in this paper, we suggest an indirect method that can measure clothing pressure without touching the subject by improving the equation of Kirk and Ibrahim (1966). However, confusions have been occurred when someone use the equation since the definition of parameters are somewhat vague. Furthermore, the estimated clothing pressure obtained by the previous method are quite different from the real values because this method does not consider the 3D effect of a human body and property changes of a transformed fabric. In this paper, the direction of principal stress and the radius of curvature in the principal direction were searched in the 3D image of the deformed girdle to get more accurate clothing pressure. The estimated clothing pressure was verified by comparing the result of the air pack type pressure sensor. It was found that the accuracy of the pressure estimation was improved by considering the 3D curvature of human body and the directional characteristics of textile fabrics.

• Applied Microscopy
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• 제12권2호
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• pp.35-44
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• 1982

The fat bodies of cabbage worm (Pieris rapae) and silk worm (Bomyx mori) during metamorphosis was comparatively studied by electron microscope. 1. Cell oranelles: Golgi apparatus were not observed in both species. It is observed that RER of cabbage worms initiate to degenerate in prepupa stage with complete degeneration at adult stage, while that of silk worms shows similar degenerative pattern. However, mitochondria of cabbage worms are transformed into autophagic vacuole from prepupa stage until adult stage whereas those of silk worm shows a decrease in number in prepupa stage but maintains a certain level until adult stage. 2. Storage substance in cell: Lipid droplets in cabbage worms were observed to increase in numbers during larval stage but afterward decrease in number with an enlargement in size. However immediately after their pupal stage, they almost disappear. On the contrary lipid droplets in silk worms show rather increase in number until adult stage. Protein storage granules in bothspecies were arised from autophagic vacuoles(lysosome) . Fat cells of cabbage worm in adult stage turn out to be residual bodies which last until final stage, but those of silk worm rapidly decrease. Glycogen particles in both species reach maximum at last larval instar and thee gradually decrease thereafter. 3. Fat body sheath: The average width of fat body sheath was measured to be $0.2{\mu}m$ and $0.6{\mu}m$ and surface of fat cells adjacent to fat body sheath in silk worm is heavily infolded.

• 생명과학회지
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• 제14권2호
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• pp.368-373
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• 2004

광범위 제초제인 Bast $a^{(R)}$에 대해 저항성을 가지는 형질전환체 벼를 개발하였다. Bar유전자를 함유하고 있는 플라스미드 pCaMV35S::Bar를 embryogenic 현탁 배양체로부터 분리한 벼의 원형질체에 도입하였다. Phosphinotricin에 대해 저항성을 가지는 형질전환체 식물체들이 재분화되었고, 이들을 15 mg/l phosphinotricin이 함유한 배지에서 다시 선별하였다. 형질전환체 벼에서 bar유전자의 삽입과 발현을 Southern과 Northern blot분석으로 확인하였고, 또한 $R_1$ 형질전환 식물체들을 PAT 활성 assay로 재차 유전자 발현을 확인하였다. Bar 유전자는 다음 세대인 $R_1$ 식물체에서 3:1 멘델 유전 양상을 나타내었고, 형질전환체 $R_1$과 $R_2$ 식물체들은 fieild에서 살포되는 제초제 양만큼 Bast $a^{(R)}$ 를 살포했을 때 제초제 저항성을 나타내었다..

• 말소리와 음성과학
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• 제4권2호
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• pp.61-70
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• 2012

The current study observes the durational interaction of tautosyllabic consonants and vowels in the word-initial position of English and Korean child-directed speech (CDS). The effect of phonological laryngeal contrasts in stops on the following vowel duration, and the effect of the intrinsic vowel duration on the release duration of preceding stops in addition to the acoustic realization of the contrastive segments are explored in different prosodic contexts - phrase-initial/medial, focal accented/non-focused - in a marked speech style of CDS. A trade-off relationship between Voice Onset Time (VOT), as consonant release duration, and voicing phonation time, as vowel duration, reported from adult-to-adult speech, and patterns of durational variability are investigated in CDS of two languages with different linguistic rhythms, under systematically controlled prosodic contexts. Speech data were collected from four native English mothers and four native Korean mothers who were talking to their one-word staged infants. In addition to the acoustic measurements, the transformed delta measure is employed as a variability index of individual tokens. Results confirm the durational correlation between prevocalic consonants and following vowels. The interaction is revealed in a compensatory pattern such as longer VOTs followed by shorter vowel durations in both languages. An asymmetry is found in CV interaction in that the effect of consonant on vowel duration is greater than the VOT differences induced by the vowel. Prosodic effects are found such that the acoustic difference is enhanced between the contrastive segments under focal accent, supporting the paradigmatic strengthening effect. Positional variation, however, does not show any systematic effects on the variations of the measured acoustic quantities. Overall vowel duration and syllable duration are longer in English tokens but involve less variability across the prosodic variations. The constancy of syllable duration, therefore, is not found to be more strongly sustained in Korean CDS. The stylistic variation is discussed in relation to the listener under linguistic development in CDS.