• 사회복지연구
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• 제44권2호
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• pp.465-497
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• 2013

본 연구는 사회복지를 포함한 사회과학의 존재론적 인식론적 이분화에 대해 비판하면서 그에 대한 대안으로서 비판적 실재론의 가능성을 탐색해본다. 사회복지이론은 '행위주체'와 '사회구조'의 이분화된 존재론적 입장을 고수해왔고 그것을 통합하고자 하는 생태체계적 관점이 지배적이었으며, 이와 같은 이론적 입장은 사회복지실천영역에도 영향을 미쳐왔다. 한편, '실증주의'와 '구성주의'로 이분화된 인식론적 관점 또한 현상을 바라보는 서로 다른 입장으로서 사회복지이론연구와 실천방법에 영향을 미쳐왔다. 이 같은 이분화된 존재론적 인식론적 관점은 행위주체와 사회구조 간 관계의 질적인 속성을 드러내고 사회 내 심층적 실재에서의 기제 작동, 그리고 인식주체와 무관한 실재에 대한 사유에 있어 한계를 가질 수 밖에 없다. 이에 대해 비판적 실재론은 층화된 실재, 과학의 대상으로 자동적 차원과 타동적 차원, 그 안에서 이루어지는 이중의 해석과 개념화의 조건들, 그리고 구조의 이중성과 실천의 이중성, 변형적 사회활동모델 등의 논의를 통해 대안적 사회복지패러다임으로서 새로운 가능성을 보여준다.

• 산업기술연구
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• 제30권B호
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• pp.17-23
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• 2010

Since the propagation of a short fatigue crack is directly related to the large crack which causes the fracture of bulk specimen, the detailed study on the propagation of the short crack is essential to prevent the fatigue fracture. However, a number of recent studies have demonstrated that the short crack can grow at a low applied stress level which are predicted from the threshold condition of large crack. In present study, the threshold condition for the propagation of short fatigue crack is examined with respect to the micro-structure and cyclic loading history. Specimens employed in this study were decarburized eutectoid steels which have various decarburized ferrite volume fraction. Rotating bending fatigue test was carried out on these specimens with the special emphasis on the "critical non-propagating crack length" It is found that the reduction of the endurance limit of their particular micro-structures can be due to the increase of the length of critical non-propagating crack, and the quantitative relationship between the threshold stress ${\sigma}_{wo}$ and the critical non-propagating crack length $L_c$ can be written as ${\sigma}_{wo}{^m}{\cdot}L_c=C$ where m,C is constant. Further experiments were carried out on cyclic loading history on the length of critical non-propagating crack. It shown that the length of critical non-propagating crack is closely related to cyclic loading history.

• 한국진공학회:학술대회논문집
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• 한국진공학회 2004년도 제27회 학술발표회 초록집
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• pp.43-43
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• 2004

• 타이어
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• 통권6호
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• pp.29-34
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• 1967

본논고는 필자가 고무에관한 기술연구차 체미시 강의 받은 내용을 초록한 것임

• 인터넷정보학회논문지
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• 제16권6호
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• pp.39-46
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• 2015

지식 공간 이론이란 학습자들이 대해 최대한의 학습 성취를 이끌어 낼 수 있도록 학습자들에 대한 가이드라인을 제공해주는 이론으로 여러 교육 환경에서 사용되어 왔다. 하지만 지식 공간 이론을 사용해왔던 많은 방법들이 주로 수작업을 통해 이루어져 왔고 이러한 작업을 지원하기 위해서 비주얼 베이직 혹은 R 등의 프로그램이 사용되어 왔지만 프로그램을 따로 배워야 하는 불편함과 시간적으로 낭비되는 등의 문제를 야기해 왔다. 본 논문에서는 이러한 문제를 해결하기 위해서 지식 공간상에서 학습자들의 지식구조를 자동으로 분석하고 결정적 학습 경로를 제공하는 이른바 지식 구조 분석 시스템을 제안한다. 제안된 시스템은 아파치 웹상에서 구현되었고, 카이 제곱 값을 산출하여 결정적 학습 흐름도를 도출하도록 하였다. 제안된 방법은 사용자들이 웹에서 편리하게 학습자들의 지식 상태 분석할 수 있도록 환경을 제공하고 지식 구조의 체계적인 검토를 위한 방법을 제시해준다.

• Wind and Structures
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• 제11권3호
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• pp.193-208
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• 2008

This paper focuses on assessing the failure of one of the transmission towers that collapsed in Winnipeg, Canada, as a result of a microburst event. The study is conducted using a fluid-structure numerical model that was developed in-house. A major challenge in microburst-related problems is that the forces acting on a structure vary with the microburst parameters including the descending jet velocity, the diameter of the event and the relative location between the structure and the jet. The numerical model, which combines wind field data for microbursts together with a non-linear finite element formulation, is capable of predicting the progressive failure of a tower that initiates after one of its member reaches its capacity. The model is employed first to determine the microburst parameters that are likely to initiate failure of a number of critical members of the tower. Progressive failure analysis of the tower is then conducted by applying the loads associated with those critical configurations. The analysis predicts a collapse of the conductors cross-arm under a microburst reference velocity that is almost equal to the corresponding value for normal wind load that was used in the design of the structure. A similarity between the predicted modes of failure and the post event field observations was shown.

• 대한안전경영과학회지
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• 제16권4호
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• pp.11-19
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• 2014

Modern systems development becomes more and more complicated due to the need on the ever-increasing capability of the systems. In addition to the complexity issue, safety concern is also increasing since the malfunctions of the systems under development may result in the accidents in both the test and evaluation phase and the operation phase. Those accidents can cause disastrous damages if explosiveness gets involved therein such as in weapon systems development. The subject of this paper is on how to incorporate safety requirements in the design of safety-critical systems. As an approach, a useful system structure using the method of design structure matrix (DSM) is studied while reflecting the need on systems safety. Specifically, the effects of system components failure are analyzed and numerically modeled first. Also, the system components are identified and their interfaces are represented using a component DSM. Combining the results of the failure analysis and the component DSM leads to a modified DSM. By rearranging the resultant DSM, a modular structure is derived with safety requirements incorporated. As a case study, application of the approach is also discussed in the development of a military UAV plane.

• Structural Engineering and Mechanics
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• 제39권1호
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• pp.125-145
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• 2011

Pushover analysis has gained significant popularity as an analytical tool for realistic determination of the inelastic behaviour of RC structures. Though significant work has been done to evaluate the demands realistically, the evaluation of capacity and realistic failure modes has taken a back seat. In order to throw light on the inelastic behaviour and capacity evaluation for the RC framed structures, a 3D Reinforced concrete frame structure was tested under monotonically increasing lateral pushover loads, in a parabolic pattern, till failure. The structure consisted of three storeys and had 2 bays along the two orthogonal directions. The structure was gradually pushed in small increments of load and the corresponding displacements were monitored continuously, leading to a pushover curve for the structure as a result of the test along with other relevant information such as strains on reinforcement bars at critical locations, failure modes etc. The major failure modes were observed as flexural failure of beams and columns, torsional failure of transverse beams and joint shear failure. The analysis of the structure was by considering all these failure modes. In order to have a comparison, the analysis was performed as three different cases. In one case, only the flexural hinges were modelled for critical locations in beams and columns; in second the torsional hinges for transverse beams were included in the analysis and in the third case, joint shear hinges were also included in the analysis. It is shown that modelling and capturing all the failure modes is practically possible and such an analysis can provide the realistic insight into the behaviour of the structure.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2004년도 ICCAS
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• pp.256-261
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• 2004

This paper presents a simple two-degree of freedom PID tuning table based on the CDM design method. The structure of the control system will be composed of plant, P or PI or PID controller and a pre-filter. The finalized formula can be used based on the experimental test of the plant in the same manner as the Ziegler-Nichols' second method. That is; users just need to find the critical gain and critical period experimentally and the parameters of the P, PI or PID controller with the pre-filter can be obtained by substituting the values of critical gain and critical period in the tuning table. The simulation results of the control systems utilizing the proposed controllers compared with those using the Ziegler-Nichols' second method will also be demonstrated.

• 영어어문교육
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• 제9권spc호
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• pp.113-129
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• 2003

This study aims to probe for ideological construction within the linguistic structure of newspaper reporting. The study focuses on news reports relating the issue of new IOC chairman election in English version of four mainstream newspaper published in Korea: The Donga Daily News, The Jungang Daily News, The Chosun Daily News, and The Korea Times. The analysis of these reports adheres to the analytic paradigm of critical linguistic analysis and shows how the newspaper articulate conflicting ideological positions in their reports of new IOC chairman election. The analysis demonstrates how the event of new IOC chairman election is naturalized in racist accounts. This study is important for understanding the constructive nature of language practices. The study concludes with a discussion to explain the need for critical awareness in choosing right teaching material, considering that news reports are widely accepted as an authentic material for English education.