• 한국건축시공학회:학술대회논문집
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• 한국건축시공학회 2017년도 추계 학술논문 발표대회
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• pp.65-66
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• 2017

Early-frost damages easily take place in smaller and thinner walls and slabs. In case of slabs, it is difficult to visually determine the depth of early-frost damage. As such, the current study aims to determine the depth of early-frost damage caused to concrete structures due to bad curing in the winter. As a result, the study found that the depth of early-frost damages increased from the top as the atmospheric temperature on the concrete surface decreased. The changes in the color allowed the observer to easily identify the depth of early-frost damage with the naked eye. In particular, the color difference between potentially damaged parts and undamaged parts were the greatest around thirty minutes of drying after wetting.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 1995년도 추계학술대회 논문집
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• pp.921-924
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• 1995

Case hardening behavior of carbon tool steel(SK5) was investigated after pulsed YAG laser irradiation. In the case od beam passes,martensite formed in the melt zone and in former pearlite regions of the austenitization zone exhibits vary high Vickers hardness values. The molten depth and width decrease as the beam power density increase. The influence of depth and width of color painted specimen was also investigated. The molten zone of the black painted specimen was the largest. The were loss of the black painted specimen was smaller than any other painted or raw material.

• 한국농공학회논문집
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• 제51권6호
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• pp.83-90
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• 2009

This study was carried out to evaluate the vertical stress properties in sandy soil according to changes of loading type in soil bin compacted three layers. The following conclusions and comparisons have been made based on careful analysis from theoretical and experimental methods. : When sandy soil subjected to cycle-loading, compression of foundation and diffusion of vertical stress increment(${\Delta}{\sigma}_2$) were influenced by magnitude of loading plate. When sandy soil subjected to reloading after removing of pre-loading, the distribution of ${\Delta}{\sigma}_2$ depth at one time of loading plate width was different from its distribution at more deep point cause of load hysteresis, so in case of design of structure, the effect of ${\Delta}{\sigma}_2$ as depth must be considered. The increment of vertical stress will be different as loading condition and foundation depth, the loading condition must be considered in case of structure design.

• 소성∙가공
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• 제8권2호
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• pp.152-159
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• 1999

This study is to investigate the effects of warm deep drawing with aluminum sheets of A1050-H16 and A5020-H32 for improving deep drawability. Experiments for producing circular cups and square cups were carried out for various working conditions, such as forming temperature and blank shapes. The limit drawing ratio(LDR) of 2.63 in warm deep drawing of circular cups in case of A5020-H32 sheet, whereas LDR of 2.25 in case of A1050-H16, could be obtained and the former was 1.4 times higher than the value at room temperature. The maximum relative drawing depth for square cups of A5020-H32 material was also about 1.92 times deeper than the depth drawn at room temperature. The effects of blank shape and forming temperature on drawability as well as thickness distribution of drawn cups were examined and discussed.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2001년도 가을 학술발표회 논문집
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• pp.293-298
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• 2001

N-value is usually used to assume the displacement depth of embankment on the soft marine clay. But N-value of the soft marine clay tend to underestimate unlike overestimating of general cases. In general case, if the length of rod is more long then N-value is more large because it is under the influence of energy loss of hammer blow. So it is reasonable to correct N-value down. But in the case of soft marine clay, N-value must not be correct down. Especially to assume the displacement depth of embankment on the soft marine clay, it must be used laboratory test results or CPT, Vane Test than N-value. In this study, it is compared with two field cases that design displacement method of embankment.

• 한국세라믹학회지
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• 제27권6호
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• pp.763-768
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• 1990

The gradient and depth of tin at the side of glasses by float process were measured. The effects of tin to ion exchanged of glasses in the molten salt of KNO3 and AgNO3 were presented by means of Ag+ ion penetration depth, diffusion coefficient variation, spectral transmittance and color coordinates. The diffusion coefficient of Ag+ ion of tin side was higher than air side, and the activation energy of tin side was 0.2-0.6Kcal/mole lower than air side. Therefore Ag+ ion penetration depth of tin side is 2-10$\mu\textrm{m}$ deeper, hence it can be seen that tin promote Ag+ ion diffusion. The same treatment of ion exchange, reddish-brown oflong wavelength in case of tin present, yellowish-amber of short wavelength in case of tin absence were revealed.

• 인지과학
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• 제17권4호
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• pp.287-301
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• 2006

깊이정보가 이차원 자극의 형태 판단에 미치는 효과를 알아보기 위하여 Posner 등(1969)의 물리적 대응과제를 이용한 두 실험을 실시하였다. 두 실험 모두 연속적으로 제시되는 두 문자나 도형이 물리적으로 동일한 형태인지 여부를 신속 정확하게 판단하는데 있어서 배경의 깊이정보가 미치는 영향에 초점을 맞추었다. 실험 1에서는 인공적으로 구성한 선형조망 단서와 결기울기 단서를, 실험 2에서는 실제 장면인 도로를 이용한 단서들을 사용하였다. 두 실험의 결과는 모두 깊이단서가 제공하는 깊이정보가 이차원 자극의 형태지각에 영향을 미치는 것으로 나타났다. 즉, 물리적으로는 형태가 동일하더라도 두 번째 대상이 깊이단서에 의해 다른 형태로 지각될 가능성이 있는 경우에는 "같다"는 물리적 대응반응의 정확도가 낮아지고 반응시간이 증가하며, 물리적으로는 형태가 다르더라도 깊이단서에 의해 동일한 형태로 지각될 가능성이 있는 경우에는 '다르다'는 정확반응이 낮아지고 반응시간이 증가하는 것으로 나타났다. 이 결과를 모양 항등성에 대한 선행연구들의 개념적 방법론적 문제점 그리고 향후 수행해야 할 연구방향의 측면에서 논의하였다.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2010년도 추계 학술발표회 2차
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• pp.181-185
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• 2010

Until now, design of Earth Retaining is practiced by 2 dimensional analysis for convenience of analysis and time saving. However, the construction field is 3 dimension, in this study, practised the 3 dimensional analysis which can reflect the field condition more exactly the scope of earth retaining wall, and researched about the effective and economical way of design, compared and reviewed with the results, by practising both the 2 and 3 dimensional analysis. existing 2 dimension. the depth of excavation, depth of embedded and soil condition. As result, under the whole conditions, more displacement came to appear to the value as result of 3 dimensional analysis more than the result of 2nd dimensional analysis. Accordingly, the displacement by the 2 dimension analysis is underestimated. Moreover, results of 2 and 3 dimensional analysis, there is no difference at displacement, when the depth of embedded is 0.5H and 1.0H, but Displacement of 1.5H is smaller than 0.5H, 1.0H. That is, the bigger the depth of embedded becomes, the displacement of Earth Retaining Wall appeared smaller. The displacement of earth retaining wall according to depth of excavation appeared bigger, when the depth of excavation is increased. In the meantime, when the soil condition is different, in the 2 dimensional analysis, the displacement appeared biggest, in case of the clay layer, but in the 3 dimensional analysis, in the beginning of excavating, the displacement of earth retaining wall appeared bigger in case of clay layer, but as excavating is in progress, the displacement of both compound soil layer and sand layer appeared big.

• Progress in Superconductivity
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• 제2권1호
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• pp.11-14
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• 2000

The notion of the finite pairing interaction energy range Td is shown to result in a linear temperature dependence of the London magnetic penetration depth length, ${\Delta}{\lambda}{/\lambda}(0)=(T/Td)2/\pi)ln2$ at low T in the case of the s-wave pairing state, accounting for data of high Tc superconductor by Hardy et al.

• 한국산학기술학회논문지
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• 제13권10호
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• pp.4845-4852
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• 2012

본 논문은 교각의 세굴심 산정공식과 교대의 세굴심 산정공식을 적용하여 하천의 홍수량 및 만곡의 유 출입 각 변화에 따른 교량의 세굴심을 산정하고 이를 비교 검토하여 세굴심 산정식의 적용성을 평가하였다. 전체적으로 홍수량 및 유 출입 각이 증가할수록 만곡부의 세굴심 편차가 증가하였으며, 특히 유 출입 각 $105^{\circ}$에서 58%의 편차를 보여 이 지형에서의 교량계획시 신중한 검토가 필요할 것으로 판단된다. 다음으로 만곡부 산정공식별 만곡부의 세굴심 편차를 산정한 결과, 교각의 경우 Andru식이 58%를 Laursen식이 26%의 편차율을 보였으며, 다음으로 CSU. 식이 17%의 편차율을 보였다. 교대는 Froehlich 공식이 44%의 편차율을 보이고 있어 위 식의 세굴심 산정식 적용시 만곡부의 수리특성을 고려한 세굴심 산정이 필요한 것을 알 수 있다. 끝으로 세굴심의 편차를 크게 보인 유 출입 각 $45^{\circ}{\sim}135^{\circ}$에 대하여 홍수량에 따른 세굴심의 편차율을 회귀분석 하여 회귀식을 제안하였다.