• 한국실내디자인학회논문집
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• 제21권1호
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• pp.220-227
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• 2012

After The Ramsar Convention took place in Korea in 2008, public interest in environment heightened, and the government has been allocating its budget for conserving our environment. Therefore, the present study focuses on eco-friendly spatial images particularly shown in ecological museums in Korea which recognizes the value of the environment and the ecology and tries to both protect them and alert people about it. The purpose of this study is proving what consist of eco-friendly spatial images by analyzing the expressive word of eco-friendly images and the image of space, providing a basic data for future space planning of ecological museums. To do this, the present study proceeds in three steps. First of all, the base of research in analyzing stage is firmly established by grasping general theories and terms regarding spatial image. As a second step, the composition and the characteristics of exhibition is clarified through on-spot investigation to provide comparative data for spatial image assessment in the future. Also through this step, we could understand how the exhibits are designed currently. In the last stage of research, expressive words regarding eco-friendly spatial images are extracted and used to analyze the spatial image of ecological museums. And the following three conclusions is deduced. First, the expressive words of eco-friendly spatial image that are extracted are as following: "healthy", "coexisting", "clean", "blending", "warm", "soft", "lively", "pure", "cool", "fresh ", "comfortable", "relaxed", "mild", "free", "harmonious", and "healing". As the second conclusion, color, and material, the formation which is an architectural factor did not have a great impact on forming eco-friendly image, but the color and the material did. The third conclusion was that the display with natural aspects actively utilized increased eco-friendly spatial image.

• 한국공간구조학회논문집
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• 제3권2호
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• pp.69-75
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• 2003

In case of rectangular lattice dome which shearing rigidity is very small, it has a concern to drop Buckling strength considerably by external force. So, by means of system to increase buckling-strength, there is a method of construction that lattice of dome is one with roof material. In a case like this, shearing rigidity of roof material increases buckling-strength of the whole of structure and can be designed economically from the viewpoint of practice. In case of analysis is achieved considering roof material that adheres to lattice of dame, there is method that considers the rigidity that use effective width frame as method to evaluate rigidity of roof material. therefore, this study is aimed at deciding effective width of roof material united with rectangular lattice dome to evaluate rigidity of roof material by effective width of frame and investigating how much does rigidity of roof material united with lattice of dome increase buckling-strength of the whole of structure according to rise-ratio. Conditions of loading are vertical-type-uniform loading. Analysis method is based on FEM dealing with the geometrically nonlinear deflection problems.

• 과학교육연구지
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• 제46권2호
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• pp.151-164
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• 2022

2015 개정 과학 교육과정의 6학년 1학기 교과서에서는 일상적으로 관측되는 천문 현상인 '낮과 밤'이 생기는 원인에 대해 설명하고 있다. 교과서상에서는 낮과 밤이 생기는 원인을 설명하기 위해 우주 기반 관점의 시각 자료만 사용되고 있다. 본 연구에서는 학생들에게 지구 기반 관점의 시각 자료를 추가로 제시하였을 때 지구 기반 관점과 우주 기반 관점의 공간 표상 형성에 어떤 변화가 있는지 알아보고자 하였다. 연구 결과 다음과 같은 결론을 얻을 수 있었다. 첫째, 학생들에게 지구 기반 관점의 시각 자료를 제시하였을 때 학생들의 지구 기반 관점은 물론 우주 기반 관점의 공간 표상 또한 변화시킬 수 있다. 둘째, 지구 기반 관점의 시각 자료가 학생들의 공간 표상 유형이 여러 측면에서 달라질 수 있는 가능성을 확인하였다. 셋째, 같은 지구 기반 관점의 시각 자료를 학생들에게 제시하더라도 성별, 공간 표상의 수준에 따라 각 관점의 공간 표상에 미치는 효과가 다르게 나타난다.

• 한국전산구조공학회:학술대회논문집
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• 한국전산구조공학회 1993년도 가을 학술발표회논문집
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• pp.207-215
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• 1993

With the aid of finite element method, this paper deals with the problem of structural response variability of transmission tower subjected to the spatial variability of material properties, Young's modulus herein. The spatial variability of material property are modeled as two-dimensional stochastic field which has an isotropic auto-correlation function. Response variability has been computed based on two numerical techniques, such as the Neumann expansion method in conjunction with the Monte Carlo simulation method. The results by these numerical methods are compared with those by the deterministic approach.

• 한국공간구조학회논문집
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• 제16권4호
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• pp.67-73
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• 2016

This paper is a study on Development of polyhedral surfaces Quasicrystal System. Quasicrystal is the quasi-crystalline material, which is the intermediate material of the crystalline material and non-crystalline material. Quasicrystal is a structures that is ordered but not periodic, the basic form is a rhombus. These studies in the field of chemistry will proceed actively studied, in the field of construction a situation that still insufficient research. Therefore, in this paper, we presents the analysis of Quasicrystal system, and the research on the applicability of as dome structures. This paper described some examples of polyhedron form, and method of applying Quasicrystal system.

• 한국공간구조학회논문집
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• 제11권4호
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• pp.101-108
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• 2011

유리강회플라스틱(GRP)은 재료의 자중에 비해 아주 높은 강도를 가지고 있다. 또한 부재의 두께에 따라서 투명 혹은 반투명의 효과를 거둘 수 있다. 하지만 Hand laminating의 특성상 일률적인 재료의 강도를 선뢰하기 어렵기 때문에 구조 계산 혹은 설계 시 반드시 재료 실험을 수행하여야한다. 본 논문은 두께 4mm, 높이 30m의 의장적 기둥을 구조적으로 설계하기 위한 재료 실험을 수행하였다. 또한 실험 결과에 대한 평가를 통해 DIN에서 규정하는 재료적인 강도와 비교 분석하였다. 이를 통해 규준에서 제시하는 값과의 차이를 확인했으며 실제 설계에 반영하기 위해 반드시 재료실험이 수행되어야함을 알 수 있다.

• 대한방사선기술학회지:방사선기술과학
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• 제44권5호
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• pp.465-471
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• 2021

Dual-energy X-ray imaging (DEI) techniques can provide X-ray images that a certain material is suppressed or emphasized by combining two X-ray images obtained from two different x-ray spectrum. In this paper, a single-shot DEI, which uses stacked two detectors (i.e., multilayer detector), is proposed to reduce the patient dose and increase throughput in angiography. The polymethyl methacrylate (PMMA) and aluminum (Al) were selected as two basis materials for material decomposition, and material-specific images are reconstructed as a vector combination of these two materials. We investigate the contrast and noise performance of material-decomposed images using iodine phantoms with various concentrations and diameters. The single-shot DEI shows comparable performances to the conventional dual-shot DEI. In particular, the single-shot DEI shows edge enhancement in material-decomposed images due to the different spatial-resolution characteristics of upper and lower detectors. This study could be useful for designing the multilayer detector including scintillators and energy-separation filter for angiography purposes.

• 한국공간구조학회논문집
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• 제8권1호
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• pp.41-48
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• 2008

대공간 구조물은 3차원적인 힘의 흐름과 면내력에 의해 외부하중에 대한 저항 능력을 극대화 시킨 형태 저항 구조로서, 일반적인 골조와는 달리 부재에 대한 유한 변형을 동반 하므로 정적, 동적 해석에 관계없이 비선형 해석이 요구 된다. 대공간 구조물의 정확한 구조 해석을 수행하기 위해서는 기하학적 비선형 및 재료적 비선형 뿐 아니라 두 효과를 함께 고려한 비선형 해석이 필요하다. 기하학적 비선형 문제가 구조재료의 특성 및 위치에 따른 비선형을 고려하지 못하고, 구조재료의 비선형 문제가 기하학적 형상에 따른 비선형을 고려하지 못한다는 상호간의 단점을 해결하기 위하여, 본 논문에서는 유한요소법으로 기하학적 비선형을 고려한 비선형 평형방정식을 적용하고, 부재의 응력-변형률 관계를 이용하여 재료적 비선형성도 함께 고려하였다. 사용된 수치해석 기법은 불안정 경로의 해를 찾아갈 수 있는 호장법을 적용하여 하중-변위 곡선을 추적하였다. 본 연구의 수치 해석결과 제시한 평면 트러스의 비탄성 비선형 거동을 정확하고 효율적으로 예측 가능한 것으로 나타났다.

• Journal of Mechanical Science and Technology
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• 제14권10호
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• pp.1041-1050
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• 2000

In this paper the effect of specimen thickness on fatigue crack growth with the spatial distribution of material properties is presented. Basically, the material resistance to fatigue crack growth is treated as a spatial stochastic process, which varies randomly on the crack surface. The theoretical autocorrelation functions of fatigue crack growth resistance with specimen thickness are discussed for several correlation lengths. Constant ${\Delta}K$ fatigue crack growth tests were also performed on CT type specimens with three different thicknesses of BS 4360 steel. Applying the proposed stochastic model and statistical analysis procedure, the experimental data were analyzed for different specimen thicknesses for determining the autocorrelation functions and probability distributions of the fatigue crack growth resistance.

• Journal of Mechanical Science and Technology
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• 제16권12호
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• pp.1652-1663
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• 2002

It is desirable to perform nondestructive evaluation to assess material properties and part homogeneity because manufacturing of carbon/carbon (C/C) composites requires complicated and costly processes. In this work several ultrasonic techniques were applied to carbon/carbon composites for the evaluation of spatial variations in material properties that are attributable to the manufacturing process. In a large carbon/carbon composite manufactured by chemical vapor infiltration (CVI) method, the spatial variation of ultrasonic velocity was measured and found to be consistent with the densification behavior in CVI process in order to increase the density of C/C composites. Ultrasonic velocity and attenuation depend on a density variation of materials. Low frequency through-transmission scans based on both amplitude and time-of-flight of the ultrasonic pulse were used for mapping out the material property inhomogeneity These results were compared with that obtained by dry-coupling ultrasonics. Pulse-echo C-scans was used to image near-surface material property anomalies such as the placement of spacers between disks during CVI. Also, optical micrograph had been examined on the surface of C/C composites using a destructive way.