• Journal of the Korean Data and Information Science Society
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• 제27권2호
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• pp.395-407
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• 2016

본 연구는 G-Theory를 적용하여 태권도 품새 평가항목에 대한 채점자 간 평가점수의 신뢰도를 추정하기 위해 G-연구로 경기일 수, 채점자 수를 다중오차원으로 선정하고 이들 변인간의 상호작용으로 인한 오차변량의 상대적 크기에 의해 오차원을 분석하고, G-연구의 결과를 토대로 D-연구를 수행하여 최적의 측정조건을 결정하는 데 목적이 있다. 결과를 요약하면 다음과 같다. G-Theory를 적용하여 태권도 품새 평가항목 중 정확성에 대해 분산성분 추정치를 추정한 결과, 오차의 영향력은 채점자국면에서 가장 크게 나타났으며, 각 설계에 따른 상호효과 (피험자 내), 피험자 간 순서였으며, 표현성 평가항목에 대한 분산성분 추정치 오차의 영향력은 상호효과 (피험자 내)국면에서 가장 크게 나타났으며, 각 설계에 따른 피험자 간, 채점자 국면 순으로 나타났다. 마지막으로 D-연구를 통하여 일반화가능도계수를 추정한 결과, 채점자 수에 따른 최적수준의 측정조건은 정확성 평가항목에서 8명의 채점자일 때 안정적인 신뢰도를 얻을 수 있으며, 표현성 평가항목에서는 7명의 채점자일 때 안정적인 신뢰도를 얻었다.

• Structural Engineering and Mechanics
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• 제75권4호
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• pp.487-496
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• 2020

Most of the previous works on numerical analysis of galloping of transmission lines are generally based on the quasisteady theory. However, some wind tunnel tests of the rectangular section or hangers of suspension bridges have shown that the galloping phenomenon has a strong unsteady characteristic and the test results are quite different from the quasi-steady calculation results. Therefore, it is necessary to check the applicability of the quasi-static theory in galloping analysis of the ice-covered transmission line. Although some limited unsteady simulation researches have been conducted on the variation of parameters such as aerodynamic damping, aerodynamic coefficients with wind speed or wind attack angle, there is a need to investigate the numerical simulation of unsteady galloping of two-dimensional iced transmission line with comparison to wind tunnel test results. In this paper, it is proposed to conduct a two dimensional (2-D) unsteady numerical analysis of ice-covered transmission line galloping. First, wind tunnel tests of a typical crescent-shapes iced conductor are conducted firstly to check the subsequent quasisteady and unsteady numerical analysis results. Then, a numerical simulation model consistent with the aeroelastic model in the wind tunnel test is established. The weak coupling methodology is used to consider the fluid-structure interaction in investigating a two-dimension numerical simulation of unsteady galloping of the iced conductor. First, the flow field is simulated to obtain the pressure and velocity distribution of the flow field. The fluid action on the iced conduct at the coupling interface is treated as an external load to the conductor. Then, the movement of the conduct is analyzed separately. The software ANSYS FLUENT is employed and redeveloped to numerically analyze the model responses based on fluid-structure interaction theory. The numerical simulation results of unsteady galloping of the iced conduct are compared with the measured responses of wind tunnel tests and the numerical results by the conventional quasi-steady theory, respectively.

• 한국콘텐츠학회논문지
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• 제13권6호
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• pp.125-136
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• 2013

최동훈은 <범죄의 재구성>(2004), <타짜>(2006), <전우치>(2009), <도둑들>(2012) 등의 영화를 만들어내며, 한국의 주류 영화감독으로 인정받음과 동시에 영화의 상업적 성공을 이루어 관객과의 소통에 성공했다. 본고는 최동훈의 영화가 수많은 관객과의 소통에 성공할 수 있었던 것은 시대적 삶을 우화적으로 그리면서 민중 문화적 축제 즉 카니발적 성격을 가졌기 때문이라고 보고자 한다. 이는 미하일 바흐친의 카니발 이론과 맞닿아 있다. 바흐친에게 카니발 이론은 민중문화를 이해할 수 있는 방법이었고, 최동훈 역시 자신의 영화 속 세계를 묘사할 때 카니발 이론의 요소들을 활용한다. 구체적으로는 카니발 이론의 미적 요소 중 탈관과 대관, 권위의 전복과 조롱, 향연의 이미지가 최동훈의 영화 속에서 캐릭터를 통해, 격하와 조롱, 군중의 언어가 대사와 이미지를 통해, 과거와 현재, 시점의 통합이 플래시백을 통해 드러난다. 이러한 특징들은 최동훈 영화에 일관되게 드러나며, 최동훈의 영화는 카니발 이론처럼 민중의 세계를 묘사하고 바라본다. 이것이 최동훈이 영화를 통해 하는 현실반영이자 현실참여이다. 관객은 그런 최동훈의 시각에 동조하고 호응한 것이었다고 본다.

• 산업진흥연구
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• 제1권2호
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• pp.109-119
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• 2016

본 연구는 노인문제에 대하여 이를 노인 개인이나 가족의 문제로 국한하지 않고 사회 전체의 문제로 파악하는 최근의 연구에 부응하여 노인문제를 사회문제의 측면에서 해결방안을 찾고자 하는 연구이다. 본 연구방법은 이론과 현장에 나타난 논쟁점을 중심으로 노인문제의 실태를 분석하였다. 먼저 노인문제에 관한 이론적 논거로 구조기능주의((structural functionalism), 갈등주의 이론(conflict theory), 상징적 상호작용주의(symbolic interaction theory) 등의 시각에서 노인문제를 파악하고자 하였다. 노인문제의 논쟁점으로는 노인 가구의 증가, 노인의 이혼 증가 및 재혼 감소, 노동시장에서의 배제, 그리고 정치적 참여와 자원봉사의 딜레마 등을 선정하여 이에 대한 현황과 그 문제점을 연구하였다. 연구 결과, 사회문제의 측면에서 노인문제를 해결방안으로 첫째, 노인에 대한 인식전환이 필요하다. 둘째, 노인에 대한 부정적 인식 제거해야 한다. 셋째, 국가와 민간의 상호보완관계 정립해야 한다. 결론적으로 사회문제의 측면에서 노인문제를 해결하기 위해서는 노인문제를 대상 노인 개인이나 가족의 문제로 국한시킬 것이 아니라 이를 사회문제로 공론화하여 사회 전체가 선제적으로 대응해야 할 것이다.

• Journal of Electrical Engineering and Technology
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• 제3권1호
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• pp.8-13
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• 2008

Because of the robust nonlinear characteristics appearing in today's modern power system, a strong interaction exists between the angle stability and the voltage stability, which were conventionally studied insularly. However, as the power system is a complex unified system, angle instability always happens in conjunction with voltage instability. The authors propose a novel method to analyze this type of stability problem. In the proposed method, the theory of normal forms of vector fields is utilized to treat the auxiliary dynamic system. By use of this method, the interaction between response modes caused by the nonlinearity of the power system can be analyzed. Consequently, the eigenvalue analysis method is extended to cope with performance analysis of the power system with heavy nonlinearity. The effectiveness of the proposed methodology is verified on a 3-bus power system.

• 지식경영연구
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• 제10권1호
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• pp.17-32
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• 2009

Cyber University has been continuously increased since it is of great necessity of education through lifelong study. Recently, the management of cyber universities does not ensure education success, because some problems are coming out. Now we are to take an interest in qualitative level of e-learning. The purpose of this study is to classify and investigate interaction factors of e-learning, which were one of the restrictions to develop e-learning, influence learning flow and satisfaction. The authors discuss the implications of the findings for interaction and learning flow theory and practice.

• 한국물환경학회지
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• 제26권3호
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• pp.525-531
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• 2010

To figure out the importance of temperature on electrochemical properties in water environment, calcium carbonate, one of important substances in water chemistry, was chosen to make suspensions. The result of electrokinetic potential of calcium carbonate suspensions revealed that it tended to increase as temperature increased. In addition, electrokinetic potential was negatively increased as suspensions became more basic. Its isoelectric point was ca. 7 regardless of temperature. The adsorption of hydrogen ions on calcium carbonate particles followed endothermic reaction. This result was verified by continuously measuring pH as adding HCl solution in calcium carbonate suspension. It explained that suspensions' potential was determined by DLVO theory which calculated total interaction energy between particles. Suspensions' total interaction energy was proportional to the value of electrokinetic potential. Furthermore, total interaction energy between particles increased as suspensions' temperature was increased.

• 한국가정과학회지
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• 제1권2호
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• pp.23-36
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• 1998

The purpose of this study was to investigate consumer competencies of urban wives an variables on it. The framework of this study was consumer socialization theory. The results were as follows; 1. There were significant differences in competencies of urban wives according to employment status, interaction with family members, interaction with peers and frequency of media exposure. 2. Employment status, interaction with family members and frequency of media exposure were independent influencing factors on consumer competencies of urban wives. 3. Reviewing a causal model, the results were as follows. Employment status, interaction with family members and frequency of media exposure had an effect on consumer competencies of urban wives directly. (Korean J Human Ecology 1(2):23～30, 1998)

• 대한기계학회논문집A
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• 제20권8호
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• pp.2546-2554
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• 1996

In order to investigate the characteristics of sound-structure interaction problems, we modeled a rectangular cavity and the flexible wall of the cavity. Because the governing equations of motion are coupled through velocity terms, we could redefine them using the velocity potential. We calculated the natural frequencies of plate using orthogonal polynomial functions which satisfy the boundary conditions in the Rayleigh-Ritz Method. As the result, comparisons of theory and experiment show good agreement. and using orthogonal polynomial functions which satisfy the boundary conditions in the Rayleigh-Ritz method show useful method for sound-structure interaction problems too.

• Bulletin of the Korean Chemical Society
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• 제34권1호
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• pp.231-236
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• 2013

Some cytotoxicity studies for the interpretation of the interaction between nanoparticles and cells are non-mechanistic and time-consuming. Therefore, non-biological screening methods, which are faster and simpler than in-vivo and in-vitro methods, are required as alternatives to current cytotoxicity tests. Here, we proposed a simple screening method for the analysis of the interaction between several AgNPs (bare-, citrate-, and polyvinylpyrrolidone-coating) and dye-containing vesicles acting as a biomimetic cell-membrane. The interaction between AgNPs and vesicles could be evaluated readily by UV-vis spectra. Absorbance deviation in UV-vis spectra revealed a large attraction between neighboring particles and vesicles. This was confirmed by (Derjagin, Landau, Verwey, and Overbeek) theory and DMF (dark-field microscopy) analysis. This proposed method might be useful for analyzing the cytotoxicity of nanoparticles with cell-membranes instead of in vitro or in vivo cytotoxicity tests.