• 한국지진공학회논문집
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• 제13권2호
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• pp.15-27
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• 2009

이 연구는 지진하중을 받는 프리캐스트 세그먼트 PSC 교각의 지진거동을 파악하는데 그 목적이 있다. 사용된 프로그램은 철근콘크리트 구조물의 해석을 위한 RCAHEST(Reinforced Concrete Analysis in Higher Evaluation System Technology)이다. 사용된 부착 또는 비부착 텐던요소는 유한요소법에 근거하며 프리스트레스트 콘크리트 부재의 콘크리트와 텐던의 상호작용을 구현할 수 있다. 그리고 수정된 접합요소는 세그먼트 접합부의 비탄성거동을 예측할 수 있다. 동적 평형방정식의 해는 HHT(Hilber-Hughes-Taylor) 법에 의한 수치적분으로 구하였다. 제안된 해석기법은 수치예제에 대하여 입력지진파에 따른 지진거동을 비교적 정확하게 예측하였다.

• Structural Engineering and Mechanics
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• 제51권1호
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• pp.89-110
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• 2014

In this study, two beam-column elements based on the Elasto-Fiber element theory for reinforced concrete (RC) element have been developed and compared with each other. The first element is based on Elasto Fiber Approach (EFA) was initially developed for steel structures and this theory was applied for RC element in there and the second element is called as Fiber & Bernoulli-Euler element approach (FBEA). In this element, Cubic Hermitian polynomials are used for obtaining stiffness matrix. The beams or columns element in both approaches are divided into a sub-element called the segment for obtaining element stiffness matrix. The internal freedoms of this segment are dynamically condensed to the external freedoms at the ends of the element by using a dynamic substructure technique. Thus, nonlinear dynamic analysis of high RC building can be obtained within short times. In addition to, external loads of the segment are assumed to be distributed along to element. Therefore, damages can be taken account of along to element and redistributions of the loading for solutions. Bossak-${\alpha}$ integration with predicted-corrected method is used for the nonlinear seismic analysis of RC frames. For numerical application, seismic damage analyses for a 4-story frame and an 8-story RC frame with soft-story are obtained to comparisons of RC element according to both approaches. Damages evaluation and propagation in the frame elements are studied and response quantities from obtained both approaches are investigated in the detail.

• 한국전산구조공학회:학술대회논문집
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• 한국전산구조공학회 2007년도 정기 학술대회 논문집
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• pp.789-794
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• 2007

Recently, the necessity of efficient and exact method to analyze structures is increasing with the importance of the seismic analysis. But the finite element method used in many field do not give the exact solution unless the length of the element is very short enough to represent the deformation of the element. Because the amount of computer calculation increase with the increasing of the number of degree of freedoms, the finite element method for the exact dynamic analysis of structures would not be efficient. To solve these problems, spectral clement method combined spectral method using the principle of wave mechanics and finite element method for the analysis of discrete models is applied to evaluate the behavior of the spatial structures. As a result of analysis. it becomes clear that the spectral element method is faster and more exact than the finite clement method.

• Composites Research
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• 제31권4호
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• pp.156-160
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• 2018

본 논문에서는 콘형 복합재 격자구조체의 구조안전성 평가 기법에 대해 연구를 수행하였다. 콘형 복합재격자구조체의 구조안전성 평가는 유한요소해석을 통해 수행되었다. 구조안전성 평가를 위한 유한요소모델은 솔리드 요소를 사용하여 생성하였다. 섬유 교차부와 비교차부의 물성 차이를 고려하기 위해 섬유 체적률을 고려한 기계적 물성을 적용하였다. 구조해석 기법의 검증을 위해 콘형 복합재 격자구조체의 압축 시험을 수행하였다. 시험과 해석의 비교 결과, 약 2%의 변위 오차가 발생하여 잘 일치하는 것을 확인하였다.

• 공학교육연구
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• 제18권3호
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• pp.24-32
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• 2015

The purpose of this research is to consider theoretical points of view on a preceding research related to an engineering design and abstract the definition of engineering design ability, its subdivision and element on the basis of experts' recognition. To achieve this goal, various literature researches were carried out by examining domestic and foreign articles in journals, lots of dissertations, and books related to engineering design through theoretical consideration. And to secure the validity on the definition of engineering design ability, its subdivision and element through the theoretical study, a feasibility evaluation method by the experts was applied. And the feasibility evaluation of the experts was conducted through 2 stages. The major conclusions of this study are as follows. Firstly, based on the experts' recognition on the definition of engineering design ability, its subdivision and element, which were revised through the 1st feasibility evaluation and then utilized in the 2st one, the validity was confirmed, and the subdivisions of the engineering design ability were divided into 5 and the elements of the subdivision ability were 33. Secondly, the engineering design ability was defined as "the one to design a realizable product with consumers' demand fully satisfying, based on a knowledge application ability, thinking ability, communication ability, problem-solving ability, and teamwork ability to solve engineering problems." Thirdly, the subdivisions of the engineering design ability were divided as a knowledge application ability, thinking ability, communication ability, problem-solving ability, and teamwork ability.

• 비파괴검사학회지
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• 제20권2호
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• pp.130-137
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• 2000

대표적인 비파괴 평가 기술들 중의 하나인 초음파응용 기술은 각종 구조물에 존재하는 내부결함에 의한 산란신호를 통해 건전성을 평가하는 기법이므로 결함의 신뢰성 높은 정량적 평가를 위해서는 결함으로부터의 초음파 산란신호특성에 대한 기본적 이해가 필수적이며 따라서 이를 위한 모델링 수치해석 연구가 요구된다. 모델링 기법들은 비파괴 평가기술에 있어서 중요한 역할을 하고 있고 많은 모델링 기법들이 결함의 탄성파 산란문제를 해석하기 위하여 사용되어 오고 있다. 본 연구에서는 다양한 수치기법들 중 탄성파 산란문제 해석에 있어 많은 장점을 가지고 있는 동탄성 경계요소법에 대하여 자세히 소개하고, 응용 예로서 경계요소법을 이용한 기공결함의 수평횡파 산란장 해석과 표면균열의 표면파 산란장 해석을 소개한다.

• 한국중재학회지:중재연구
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• 제20권2호
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• pp.199-225
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• 2010

This study investigates the characteristics of local arbitration committees in China based on arbitration institution evaluation model. Most of the literature on Chinese arbitration committees only focuses on CIETAC. However, the promulgation of 1994 Chinese arbitration act allows local arbitration committees to deal the arbitration cases related with foreign element. Before 1994, only CIETAC and CMAC handle the arbitration cases related with foreign element. For the evaluation of the local arbitration committees, this study establishes the arbitration institution evaluation model. This model has seven evaluation criteria: accessability, independence, neutrality, rapidity, economy, professionality, and extent of enforcement. Our findings are as follows. First, Chinese local arbitration committees have the strengths in the fields of accessability, economy and rapidity. However, they are deficient in the area of neutrality, professionality, and independence. Second, the spatial distribution of Chinese local arbitration committees is not equal in China. The number of local arbitration committees is big in the high growth region such as Shandong province. On the other hand, the number of local arbitration committees is small in the economically stagnant area. Third, the size and activity of local arbitration committees are various. Some of them are very active in dispute resolution through arbitration in China. For example, Beijing Arbitration Committee(BAC), Wuhan, Quangzou Arbitration Committee play the important role in dispute resolution through arbitration. However, the large part of local arbitration committees is financially weak and depend on the local government's financial support.

• 대한인간공학회지
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• 제28권4호
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• pp.77-82
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• 2009

This paper objected which prevented the accident occurrence of the related farm work, and developed the evaluation indicators for safety supervision on life environment of farmer and farm work to evaluate the health of farm worker and a musculoskeletal disorders. We selected the evaluation item to 82 items for executing the secondary Delphi investigation and the literature research which composed the farm work relationship specialist conference. We applied the index production of the evaluation indicators to decide the detailed element weight from the element which is farm work, the farm machine and the organization, farm workshop, dangerous substance, and life environment through the AHP techniques. Through the result, we can apply other ergonomic evaluation instrument of farm work field, but also the evaluation indicators for safety supervision on farm work.

• Structural Engineering and Mechanics
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• 제8권5호
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• pp.477-490
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• 1999

The uncertainties associated with structural parameters and dynamic loading are identified and discussed. Structural parametric uncertainties are treated as random variables and dynamic wind load is simulated as a random process. Dynamic wind-induced responses of structures with parametric uncertainties are investigated by using stochastic finite element method. The formulas for structural dynamic reliability analysis considering the randomness of structural resistance and loading are proposed. Two numerical examples of high-rise structures are presented to illustrate the proposed methodology. The calculated results demonstrate that the variation in structural parameters indeed influences the dynamic response and the first passage probability evaluation of structures.

• 한국소성가공학회:학술대회논문집
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• 한국소성가공학회 1999년도 춘계학술대회논문집
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• pp.257-260
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• 1999

It is very important to design the shape of container in HIPing process since the final shape and relative density distribution of the product are decisively dependent on the shape of container. A derivative based approach to determine the shape of container in HIPing process is presented. In this approach the optimal design problem is formulated on the basis of the finite element process. The process model the formulation for process optimal design and the schemes for the evaluation of the design sensitivity and an iterative procedure for optimization are described. In comparison with finite difference scheme the validity of the schemes for the evaluation of the design sensitivity is examined.