• 지구물리
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• 제2권2호
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• pp.135-142
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• 1999

선형 자기쌍극자 모델의 하나인 철근에 대하여 3성분 자력계를 이용한 자력검층을 실시한 후 검층자료를 최소 자승법에 의한 역산을 이용하여 해석하였다. 본 실험에 사용된 철근의 길이는 1.12 m, 샘플링 간격은 0.05 m, 자력계와 철근사이의 거리는 0.3 m이며, 철근의 상단부를 깊이 0 m 지점에 고정하였다. 철근은 연직에 가깝도록 위치시켰다. FFT를 이용하여 평활화한 자기이상을 역산의 입력자료로 활용하였다. 검층자료의 해석을 위하여 선형 자기쌍극자의 상단부 심도, 길이, 단위 길이 당 자기모멘트, 자화방향(편각 및 복각), 경사방향과 경사각 등을 미지수로 설정하였다. 자기이상의 수평성분 및 수직성분 각각에 대한 역산 결과와 수평성분과 수직성분을 동시에 고려한 역산 결과를 비교하였는데 각각의 역산결과는 다소 차이를 보인다. 자기이상의 수평성분과 수직성분을 동시에 고려하여 역산을 수행하는 것이 각각의 성분을 역산하는 경우보다 정확한 해석이 가능한 것으로 판단된다. 이 때 철근 하단부의 추정 심도는 1.18 m로, 실제 심도인 1.12 m에 매우 근접하며, 철근의 복각은 -76°로 추정되었다. 철근의 복각이 음(-)의 값을 갖는 것은 철근의 유도자화 강도에 비하여 잔류자화 강도가 훨씬 커서, 전체적인 자화 방향이 철근의 상단 방향을 향하고 있기 때문으로 해석된다.

• 한국실내디자인학회논문집
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• 제40호
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• pp.26-33
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• 2003

Contemporary architecture has two different movements that one is the utilization of digital technology and the other is the inclination to nature. After deconstructivism in architecture, the tendency of design shows the fusion between digitalism and organicism and as a consequence the phenomena of 'skin expression' has emerged which can be thought as 'organic digitalism' or 'digital organicism'. The definition of skin tendency in environmental design is the design of nature based on the technology. As a result, the surface becomes the design issue compared to structure and the momentum for new aesthetic value. There are post-structuralism, complex system theory and the organic architecture as theoretical background for the tendency of skin expression. Specially the ideas of post-structural philosophy has effected deeply to the formation of its movement and also offered the theoretical nutrition for digital architecture. The characteristics of the skin tendency can be analyzed as topological transformation, smooth continuum, deterritorialization, ecological response system, and tactility. These design characteristics has combined with conventional material and design vocabulary to transform and develope new spatial conception.

• Computers and Concrete
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• 제16권1호
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• pp.179-190
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• 2015

An experimental program has been carried out to investigate the effect of edge-slope on compressive strength of concrete specimens. In this study, effect of such slope was investigated by testing 100 standard cylinder specimens and 40 standard cubes. When molds are put on a slanted place, wet concrete starts to flow through the open end of mold. It keeps flowing until it reaches to a parallel surface with the place over which it was placed. That creates a sloped surface over the loading area. Experimental results revealed significant relationships between failure loads and slope of loading surface for cylinders. Angled cracks occurred in sloped cylinder specimens. Tension cracks occurred in cube specimens. Fracture mechanisms were also evaluated by using finite element analyses approach. Experiments yielded an exponential curve with bandwidth for cylinders. Average value of curve is $y={\frac{\pi}{2}}e^{-cf}$ between slope and compressive strength. Inclination is much effective parameter for cylinders than cubes.

• Computers and Concrete
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• 제1권4호
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• pp.433-455
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• 2004

The paper presents results of FE-calculations on shear localizations in quasi-brittle materials during both an uniaxial plane strain compression and uniaxial plane strain extension. An elasto-plastic model with a linear Drucker-Prager type criterion using isotropic hardening and softening and non-associated flow rule was used. A non-local extension was applied in a softening regime to capture realistically shear localization and to obtain a well-posed boundary value problem. A characteristic length was incorporated via a weighting function. Attention was focused on the effect of mesh size, mesh alignment, non-local parameter and imperfections on the thickness and inclination of shear localization. Different methods to calculate plastic strain rates were carefully discussed.

• The International Journal of Costume Culture
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• 제5권2호
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• pp.1-14
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• 2002

The first purpose of this research is to investigate the functionalistic concept through the general consideration of Functionalism, and to study the art's aesthetic value of functionalistic expressionist artists implication and form in terms of architecture and product design. Secondly, it analyzes the implication and shape of Functionalism towards 'Art to Wear', which can be explained as a mixture of fashion and art. The results are as follows; First, functionalistic 'Art to Wear' of Mechanical Analogy appears to have futuristic inclination stressing the significance of geometric shapes and machine aesthetics. It uses new materials, and reduce an unnecessary work of art to convey more accurate, concrete and effective character of form. Secondly, functionalistic 'Art to Wear' of Organic Analogy regards natural elements as important to pursue the warm human nature. Also, it appears to be free and comforting forms of Functionalism through an organic silhouette. Thirdly, functionalistic 'Art to Wear' of Moral Analogy excludes excessive ornaments, and includes the implication of appropriate and purposive purity which serves for practical function.

• Computers and Concrete
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• 제14권1호
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• pp.59-71
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• 2014

The paper is concerned with the analytical description of a resistance mechanism, not considered in previous models, by which the hoops contribute to the shear capacity of RC columns with circular cross sections. The difference from previous approaches consists in observing that, because of deformation, the hoops change their original shape and, as a consequence, their slope does not match anymore the original one in the neighborhood of a crack. The model involves two parameters only, namely the crack inclination and the hoop strain in the neighborhood of a crack. A closed-form analytical formulation to correlate the average value of the crack width and the hoop strain is also provided. Results obtained using the proposed model have been compared with experimental data, and a satisfactory agreement is found.

• 대한기계학회:학술대회논문집
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• 대한기계학회 2000년도 춘계학술대회논문집B
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• pp.7-12
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• 2000

The purpose of this study is to develop heat transfer analysis program of heat pipe elements and design a revolving heat pipe exchanger by the performance experiment of hot air production by means of middle-temperature waste heat. Experimental variables are the revolution per minute, normal velocity of inlet air and the temperature of waste heat. The revolving heat exchanger has designed as $2^{\circ}$ in inclination angle of heat pipe bundle and as 20% in working fluid quantity and as water in working fluid. Experimental value of the total heat transfer coefficient was $20w/m^2-^{\circ}C$

• Journal of Astronomy and Space Sciences
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• 제3권1호
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• pp.53-66
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• 1986

Isophotes and surface brightness distribution were obtained for the late type normal spiral galaxy NGC 7793 (morphological type SA(s)d) which is one of the Sculptor group. The calculated total luminosity $M_{T}$ is obtained as 9.44 and the corrected face on magnitude ${B_T}^{circ}$ is 9.10. The revised distance to this galaxy $\Delta$=3.1 Mpc (de Vaucouleurs and Davoust 1980) is used for calculating the absolute magnitude ${M_T}^{circ}$ = -18.36. From the isophotes, the position angle to the major axis is $101^{circ}$, the mean axial ratio is q=b/a =0.65, and the inclination is i=50$^{circ}$. The concentric indices $C_{21}$=1069 and $C_{32}$ =1.50 are well agreed to the average value of Sd type galaxies.

• 설비공학논문집
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• 제8권1호
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• pp.99-109
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• 1996

Experimental investigations are carried out for the characteristics of bubble rise in the Miniature Two-Phase closed Thermosyphon(MTPCT) with a thin wire insert. The working fluids applied as experimental media are of three kinds: water, methanol, and ethanol. The effects of combination of the inclination with diametric ratio $\alpha$(=d$_{0}$/D$_{I}$) on rising velocity of a large bubble in the thermosyphon are explicitly analyzed. The realm of a movable bubble and the critical value of $\alpha$ are iteratively pursued to interpret the region Figures-of-Break, rooted in the governing physics relations, according to the application of working fluid. Experimental results are compared with those of analysis and critical ranges for $\alpha$ and D$_{I}$ were ascertained from comparisons.isons.

• International Journal of Air-Conditioning and Refrigeration
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• 제16권2호
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• pp.70-76
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• 2008

The effects of the inclined perforated baffles on the distributions of the local heat transfer coefficients and friction factors for air flows in a rectangular channel were determined for Reynolds numbers from 23,000 to 57,000. Four different types of the baffle are used. The inclined baffles have the width of 19.8cm, the square diamond type hole having one side length of 2.55cm, and the inclination angle of $5^{\circ}$, whereas the corresponding channel width-to-height ratio was 4.95. Results show that the heat transfer and friction factor depend significantly on the number of baffle holes and Reynolds number. The friction factor decreases with increasing Reynolds number and the number of holes on the baffle, and the heat transfer performance of baffle type II (3 hole baffle) has the best value.