• 한국공간구조학회논문집
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• 제11권2호
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• pp.111-118
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• 2011

단층 래티스 돔과 같은 스페이스 프레임 구조물은 대공간을 확보하기 위하여 강접합으로 설계함으로써 경제성과 심미성 등의 장점을 확보할 수 있다. 그러나 실제 구조물의 접합상태는 완전한 강접합도, 완전한 핀접합도 아닌 접합부 상세에 따라 중간적인 특성을 나타내는 반강접합이 일반적이다. 본 연구에서는 저자 등에 의해 제안된 Step-Up Erection 공법을 적용하여 단층 라멜라 돔의 접합부 강성에 따른 시공 중의 좌굴 특성을 해석적으로 규명하였다. 얻어진 결과는 시공 Step이 증가할수록 그리고 접합부 휨강성이 핀접합에 가까울수록 좌굴내력은 감소하였으며, 좌굴모드는 시공 Step이 증가할수록, 접합부 휨강성이 강접합에 가까울수록 돔의 정점 부근에서 뜀좌굴 현상에 의한 절점좌굴이 발생하였다. 또한, 시공 Step이 낮을 경우 저면 경계부의 원주방향 부재에서 큰 인장응력 분포를 나타내었으며, 시공 Step이 증가할수록 정점 중앙부에서 큰 압축응력 분포를 보였다. 완성돔을 제외한 시공 중 Step에서는 Step이 증가할수록, 접합부 휨강성이 핀접합에 가까울수록 저면부 경선방향 부재에서 큰 인장응력 분포를 나타내었다.

• 한국전산구조공학회:학술대회논문집
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• 한국전산구조공학회 1990년도 봄 학술발표회 논문집
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• pp.50-52
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• 1990

Although concrete pavements were successfully widespread throughout the nation due to the desirable surface characteristics, durability, and economy, it still causes several transverse cracking and joint failure problems in some areas. In this paper, the major emphasis was given to provide a rational analytical approach on joint failure mechanisms, considering several sets of joint stiffnesses on different subgrade moduli. Besides , load transfer mechanisms on concrete pavement joints were highlighted with finite element method and computer modeling.

• 국제학술발표논문집
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• The 1th International Conference on Construction Engineering and Project Management
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• pp.768-773
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• 2005

Among various joint ventures, International Construction Joint Ventures (ICJVs) have emerged as a popular approach worldwide to developing large scale projects through international participation. A model, based on economic analysis and represented by several hypotheses obtained from the analysis, will be developed. Furthermore, we will empirically test the hypotheses/model using Structural Equation Model (SEM). This research is expected to explain why there exist different organizational forms for ICJVs, and to develop a framework for choosing appropriate forms with respect to various characteristics of ICJVs.

• 한국시스템다이내믹스연구
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• 제13권1호
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• pp.113-131
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• 2012

Applying social network analysis techniques, this study examines complex system characteristics of industry-university joint research R&D networks. In specific, it focuses on whether these R&D networks comply with the power law, whose system typically presents the-rich-get-richer and the-poor-get-poor patterns. The basic data come from 7,751 industry-university joint research projects, all of which were carried out by Daejeon, Chungbuk, and Chungnam-based universities from January 2005 to October 2008. The empirical results reveal that the R&D networks abide by the power law. That is, a handful of business units and universities command an overwhelming majority in the joint links, indicating positive feedback dominance within the system.

• 대한기계학회:학술대회논문집
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• 대한기계학회 2007년도 춘계학술대회A
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• pp.792-795
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• 2007

To quantify irregular body motions the time series analysis was applied to the gait study. The motions obtained from gait experiment are complex to exhibit nonlinear behaviors. The purpose of this study is to measure quantitatively the characteristics of the major six joints of the body during walking. The gait experiments were carried out for eighteen young males walking on a motor driven treadmill. Joint motions were captured using eight video cameras, and then three dimensional kinematics of the neck and the upper and lower extremities were computed by KWON 3D motion analysis software. The largest Lyapunov exponent was calculated from the time series to quantify stabilities of each joint. The results provides a data set of nonlinear dynamic characteristics for six joints engaged in normal walking.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2009년도 춘계 학술발표회
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• pp.595-606
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• 2009

This paper presents the characteristics of stress transfer around carven due to cavern size and rock joint properties by laboratory model test. In order to perform this study, eight different scaled model tests were carried out according to excavation stage. The limited numerical analysis were also performed to verify the model test results. The amount of stress transfer around the cavern is increased and then decreased by longitudinal arching effect according to tunnel excavation. It is founded that the stress developed around the cavern during excavation is increased when the cavern size and joint orientation are increased. It is also investigated that shear behaviour (such as stress, deformation) developed around cavern is considerably depended on the characteristic of fill material, dip and direction of joints. It is suggested that the behaviour will be verified throughout the 3D numerical prediction.

• Steel and Composite Structures
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• 제1권4호
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• pp.441-458
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• 2001

We analyzed the experimental and theoretical behavior of a particular type of steel joint designed to connect beam to beam and able to transfer both shear forces and bending moments. This joint is characterized by the use of steel plates and bolts enclosed in the width of the beams. The experimental investigation was carried out characterizing the constituent materials and testing in flexure beams constituted by two portions of beams connected in the middle with the joint proposed. Connections having different characteristics in terms of thickness of plates, number and type of bolts were utilized. Flexure tests allow one to determine the loaddeflection curves of the beam tested and the moment-rotation diagrams of the connections, highlighting the strength and the strain capacity of the joints. The proposed analytical model allows one to determine the moment-rotation relationship of the connections, pointing out the influence of the principal geometrical and mechanic characteristics of single constituents on the full properties of the joint.

• International journal of advanced smart convergence
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• 제12권3호
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• pp.61-67
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• 2023

Gait analysis plays a key role in the research field of exploring and understanding human movement. By quantitatively analyzing the complexity of human movement and the various factors that influence it, it is possible to identify individual gait characteristics and abnormalities. This is especially true for people with walking difficulties or special circumstances, such as amputee, for example. This is because it can help us understand their gait characteristics and provide individualized rehabilitation plans. In this paper, we compare and analyze the differences in ankle joint motion and angles between normal and amputee. In particular, a filtering process was applied to the ankle joint angle data to obtain high accuracy results. The results of this study can contribute to a more accurate understanding and improvement of the gait patterns of normal and amputee.

• 한국지구물리탐사학회:학술대회논문집
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• 한국지구물리탐사학회 2003년도 Proceedings of the international symposium on the fusion technology
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• pp.78-82
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• 2003

In this paper, simulated annealing technique was used to estimate the rock joint characteristics, RMR(rock mass rating) values, to overcome the defects of ordinary kriging. Ordinary kriging reduced the variance of data, so lost the characteristics of distribution. Simulated annealing technique could reflect the distribution feature and the spatial correlation of the original data. Through the comparisons between three times simulations, the uncertainty of the simulation could be quantified, and sufficient results were obtained.

• 한국수자원학회논문집
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• 제49권12호
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• pp.1035-1044
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• 2016

제방과 보의 접속부에서는 복잡한 3차원이 흐름이 발생하여 붕괴가 자주 발생한다. 따라서 연결부에는 일반적인 호안에 비해 큰 안정성을 가진 연결호안의 설치가 필요하다. 그러나 연결호안에 대한 설계기준은 하천설계기준에 제시되어 있지 않기 때문에 연결호안의 공학적인 설계를 위한 연구가 필요하다. 본 연구에서는 연결호안에 사석을 포설하고 사석의 이탈조건을 파악하기위해 유량을 변화시켜가며 실험을 수행하였으며 실험수로는 폭 4 m, 길이 20 m의 직선수로이며 한쪽에만 제방이 설치되어 있다. 연결호안의 사석직경은 0.03 m 이며 유입유량은 $0.5{\sim}0.8m^3/s$이다. 동일한 조건에 대한 수치모의를 수행하여 연결부에 대한 흐름조건 및 제방 비탈면의 전단응력 등의 분포를 통해 영향범위를 파악하였다. 그 결과 연결호안의 경우 일반호안에 비해 사석직경이 4.1~6.9배 크게 산정되는 것으로 나타났으며 사석의 이탈속도가 같아도 유량이 클수록 취약지역의 범위가 하류방향으로 더 길게 발달하는 것으로 나타났다. 본 연구를 통해 연결호안 주변의 수리학적 특성에 따른 사석직경 및 영향범위를 산정하는 방법을 제안하였으며 추후 고수부지의 영향, 다양한 형식의 보와 호안에 대한 실험과 추가적인 검토가 수행된다면 연결호안의 안정성을 확보 할 수 있는 합리적인 설계방법을 제시할 수 있을 것이라고 기대된다.