• 전산구조공학
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• 제8권1호
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• pp.123-126
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• 1995

The purpose of the analysis is the numerical simulation of structures strained to the limit loads. The finite element calculations and experiments with cracked structures have been carried out yielding over limit strains between 10% and 15% by single peak load. Load versus displacement-diagrams and J-diagrams up to the limit load are calculated. By this way the influence of geometric parameters may be assessed in the post yield region. It is proposed to use such calculations to correlate experiments carried out with small specimens to experiments simulating the true dimensions of the design structure.

• 한국신재생에너지학회:학술대회논문집
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• 한국신재생에너지학회 2009년도 추계학술대회 논문집
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• pp.422-422
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• 2009

This paper describes the structural design of small wind turbine blade by using design of experiments. Blade structure consists of skin, spar and foam. The materials for skin and spar are a kind of Glass/Epoxy and form is polyurethane. It has 7 lay-ups with different ply angle. A factorial design is applied to design the ply angles considering manufacturing constraints and to investigate the safety factor which is calculated by structural analysis. In order to perform the structural analysis, the commercial software ABAQUS is used. Tsai-Wu failure criterion is chosen to compute safety factor. The determination of the significance of effects in the experiments is made through the analysis of variance. The results show that ply angle at skin affects the safety factor of wind turbine blade. And from this result, optimal ply angles of composite blade are achieved.

• 한국전산구조공학회논문집
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• 제22권5호
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• pp.391-401
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• 2009

하이브리드 구조실험에서는 구조물을 여러 개의 부분구조물로 나누어서 실험과 해석을 하고 이의 결과를 합쳐서 전체적인 구조물의 거동을 파악한다. 이러한 방법은 진동대 실험과 비교하여 구조물의 크기제한의 영향을 받지 않는 유사동적 실험에 효과적이다. 하이브리드 구조실험과정에서 발생된 데이터와 관련 정보를 저장하고 검색할 수 있는 컴퓨터시스템을 만들기 위해서는 하이브리드 구조실험과 관련된 정보를 체계화시켜서 구성하는 작업이 선행되어야 한다. 본 논문은 하이브리드 구조실험에 관련된 정보를 표현하는 데이터 모델을 제시하고 있는데, 이 데이터 모델은 포괄적인 구조실험 정보를 표현하는 데이터 모델의 하나인 리하이 모델에서 하이브리드 실험부분을 개선한 것이다. 하이브리드 구조실험에서의 부분구조물들을 표현하기 위하여 실험모델 클래스와 해석모델 클래스를 정의하였고, 이러한 클래스들의 정보교환을 조정하는 클래스를 정의하였으며, 제한된 범위의 시스템을 구현하여 객체들 간의 연결 상태를 파악할 수 있도록 하였다. 본 논문에서 기술한 데이터 모델은 구조실험자와 연구자들이 사용할 수 있는 하이브리드 구조실험 정보를 저장하는 컴퓨터 시스템을 개발하는데 적용할 수 있을 것으로 사료된다.

• 한국전산구조공학회:학술대회논문집
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• 한국전산구조공학회 1993년도 봄 학술발표회논문집
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• pp.45-52
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• 1993

Evaluation of structural stability of aged wharf structure of pier type is of great importance for both safety and rehabilitation, Series of field dynamic experiments were performed for berthing impact and the results were used to calibrate analysis model. Through dynamic analysis for design, berthing impact safety of old wharf structure were evaluated. In this paper the procedure and results of experiments and analysis are presented.

• 한국해양공학회지
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• 제34권4호
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• pp.253-262
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• 2020

This study provides a comparative analysis of experiments-based enhancements and sensitivity evaluations for the structural design of an automatic ocean salt collector under various load conditions. The sizing variables of the structural members were considered as design factors. The strength and weight performances were selected as output responses. The design of experiments used in the comparative study consisted of the orthogonal array design, Box-Behnken design, and central composite design. The response surface model, one of the metamodels, was applied to the approximate model generation. The design enhancement performance metrics, including numerical costs and weight minimization, according to the design of experiments, were compared from the best design case results. The central composite design method showed the most enhanced design results for the structural design of the automatic ocean salt collector.

• 한국자기공명학회논문지
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• 제12권2호
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• pp.89-95
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• 2008

Function of protein is frequently related with tautomeric states of histidine sidechains. Thus, several NMR experiments were developed to determine the tautomeric states of histidines. However, poor sensitivity of these experiments caused by long duration of magnetization transfer periods is unavoidable. Here, we alleviate the sensitivity of HCN experiment for determining the tautomeric states of histidine residues using TROSY principle to suppress transverse relaxation of $^{13}C$ spins during long polarization transfer delays involving $^{13}C-^{15}N$ scalar couplings. In addition, this experiment was used to assign the sidechain resonances of histidines. These assignments can be used to follow the pH-titration of histidine sidechains.

• Structural Engineering and Mechanics
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• 제32권4호
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• pp.489-500
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• 2009

The aim of this paper is to compare wavelet, kurtosis and pseudofractal based techniques for structural health monitoring in the presence of measurement noise. A detailed comparison and assessment of these techniques have been carried out in this paper through numerical experiments for the calibration of damage extent of a simply supported beam with an open crack serving as an illustrative example. The numerical experiments are deemed critical due to limited amount of experimental data available in the field of singularity based detection of damage. A continuous detectibility map has been proposed for comparing various techniques qualitatively. Efficiency surfaces have been constructed for wavelet, kurtosis and pseudofractal based calibration of damage extent as a function of damage location and measurement noise level. Levels of noise have been identified for each technique where a sudden drop of calibration efficiency is observed marking the onset of damage masking regime by measurement noise.

• Steel and Composite Structures
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• 제16권3호
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• pp.289-303
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• 2014

In recent, development of construction and design technology gives taller, larger and heavier steel framed structures. With the tendency of increasing high-rise building, this study is strongly related to structural system, one of significant components in structural design. This study presents an innovative structural system, with high performance steel material, diagrid. Its detail, structural analysis, and structural experiments are all included for the development of new structures.

• 한국전산구조공학회:학술대회논문집
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• 한국전산구조공학회 2006년도 정기 학술대회 논문집
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• pp.29-34
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• 2006

In general, the vertical vibration problems for .strength of members and serviceability of building structures are not considered in structural design process, but the prediction of the vertical vibration is very important and essential to structural design process. This study aims to investigate the characteristics of vertical vibration in terms of the transfer of horizontal directions on the rahmen building structures. In order to examine the characteristics of vertical vibration, the modal test and the impact (heel-drop and hammer) excitation experiments were conducted several times on three building structures. The results from the experiments are analyzed and compared. with the results. The results of this study suggest that the characteristics of vertical vibration transfer in horizontal way are effected from the fundamental frequency of the slabs and excitation forces.

• 한국전산구조공학회논문집
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• 제23권2호
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• pp.123-137
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• 2010

하이브리드 구조실험에서는 전체구조물을 여러 개의 부분구조물로 나누어서 실험과 해석을 수행한다. 실험을 위한 부분 구조물들과 해석을 위한 부분구조물들은 지역적으로 서로 다른 장소에서 실험과 해석이 수행될 수 있으며, 이 부분구조물들의 실험과 해석은 시뮬레이션 코디네이터에 의하여 통제된다. 하이브리드 구조실험을 수행하는 동안에 시뮬레이션 코디네이터와 부분구조물들은 서로 간에 데이터 교환이 이루어지는 상호작용을 하게 된다. 본 논문은 이러한 상호작용을 기술하고 있는데, 하나의 하이브리드 구조실험 예제에 대하여 시뮬레이션 코디네이터와 부분구조물들 사이의 상호작용을 데이터 모델의 하나인 리하이 모델의 클래스와 객체를 통하여 표현하였다. 시뮬레이션 코디네이터와 부분구조물들은 각자의 데이터 저장을 위한 객체를 가지도록 구성하였고, 서로간의 연결은 동일한 형식의 인터페이스 링크를 사용하여 처리하였다. 본 논문에서 설명한 객체들은 일관된 방법에 의하여 구현하였는데, 하이브리드 구조실험을 위한 컴퓨터 시스템의 개발에 사용할 수 있다.