• 대한토목학회논문집
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• 제29권4D호
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• pp.523-533
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• 2009

본 연구는 주행하는 자기부상열차와 교량간의 동적상호작용 특성을 파악하는 것이다. 이를 위해서 차량에 의한 교량의 정적처짐을 레일조도에 포함시켜 가진형태로 고려되는 2자유도 자기부상열차의 운동방정식과 동적상호작용에 의한 교량의 동적처짐을 레일조도와 함께 고려된 열차의 운동방정식을 각각 유도하였다. 이때 EMS위치에서의 부상공극 및 연직방향의 상태로부터 전상태를 추정하는 LQG기법을 고려하였다. 수치해석결과 레일조도가 없는 경우에는 자기부상열차의 주행성에 차량-교량간의 동적상호작용효과가 현저하게 커지지만, 레일조도가 고려될 경우에는 교량의 정적처짐을 가진으로 고려한 경우와 동적상호작용을 고려한 해석결과의 차이가 크지 않다는 것을 관찰할 수 있었다. 결론적으로 교량의 충격계수와 자기부상열차의 주행성능을 정확히 파악하기 위해서는 레일조도를 포함하는 교량-차량간의 동적상호작용해석이 필요한 것으로 판단된다.

• 한국안전학회지
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• 제14권3호
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• pp.25-32
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• 1999

This study has been performed to investigate the stress distribution around defects that behave as stress concentrators. Besides, the effect of stress interaction effects on the initiation of primary cracks were also investigated by rotary bending fatigue tests which were performed with specimens drilled micro surface defects and the stress distribution was analyzed using Finite Element Method. In addition, the stress interaction effects around defects and cracks were investigated by comparing the results of experiments and F.E.M. The results obtained are summarized as follows ; 1) Area which slip and micro cracks initiated at micro surface defects is between the maximum shear stress points and this area is over than ${\pm}30^{\circ}$ from the maximum stress point along the defect edge. 2) The stress interaction effect for the small size defect is larger than that of large size defect when the interval between them is near 3) Interval which there is no shear stress interaction effect analyzed by F.E.M. is larger than that of experimental results.

• Journal of the Korean Data and Information Science Society
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• 제19권4호
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• pp.1059-1071
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• 2008

In a balanced factorial design with a nested factor where crossed factors as well as a nested factor exist simultaneously, powers of the rank transformed FR statistic for testing the main, nested and interaction effects are superior to those of the parametric F statistic. In heavy tailed distributions such as exponential and double exponential distributions, powers of the FR statistic show much higher level than those of the F statistic. Further powers of the F and FR statistic for testing the main effect show the highest level in an absolute size as compared with powers of the F and FR statistic for testing the nested and interaction effects. However powers of the FR statistic for testing the nested and interaction effects rather than the main effect are greater in a relative size than powers of F statistic for the all population distributions.

• 정보처리학회논문지:컴퓨터 및 통신 시스템
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• 제2권1호
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• pp.27-34
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• 2013

클라우드 컴퓨팅 서비스에 대한 관심이 높아지고 있다. 하지만 많은 관심에도 불구하고 클라우드 컴퓨팅 서비스에 대한 기존 연구는 한계점이 있다. 선행연구들은 이 서비스가 제공하는 많은 혜택에 대한 연구와 이 서비스를 선택할 경우 발생할 수 있는 문제점에 대해 독립적으로 연구하고 있다. 하지만 실제 생활에서 소비자는 클라우드 컴퓨팅 서비스를 선택할 경우 혜택과 비용에 대해 동시에 고려한다. 따라서 본 연구에서는 클라우드 컴퓨팅 서비스 선택 시 혜택과 비용에 대한 상호작용 효과를 탐색적으로 분석하였다. 분석 결과 독립변수로써 유용성, 사회적영향, 그리고 혁신성은 인지된 가치에 모두 정(+)의 유의한 영향을 주었다. 하지만 혜택과 비용과의 상호작용 효과 분석 결과 유용성과 혁신성만이 비용과의 인지된 가치에 대해 통계학적으로 유의한 것으로 나타났다. 유용성은 비용과의 인지된 가치에 대해 상호작용 효과에 대해 음(-)의 결과가 나타났으며, 혁신성은 비용과의 인지된 가치에 대해 상호작용 효과 검정 결과 정(+)의 상호작용 효과가 있는 것으로 나타났다. 결국 본 연구는 클라우드 컴퓨팅 서비스를 선택할 경우 소비자가 느끼는 혜택의 경우 비용을 고려할 때 인지된 가치에 서로 다른 영향을 줄 수 있음을 실증했다는 점에서 의의가 있다고 하겠다.

• 한국보육지원학회지
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• 제11권4호
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• pp.1-17
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• 2015

본 연구는 유아의 또래 상호작용과 자기조절, 리더십 간의 관계를 밝히고, 또래와의 상호작용이 유아의 리더십에 미치는 영향에서 자기조절의 매개효과를 알아보는 데 목적이 있다. 연구 대상은 서울, 경인 지역의 유아교육기관에 재원 중인 만 4-5세 유아 211명이었고 유치원과 어린이집 근무한 교사 대상으로 질문지를 조사 실시하여 수집된 자료 분석 하였다. 분석은 SPSS 21 프로그램을 이용하여 평균, 표준편차, 왜도, 첨도, 상관분석을 실시하였고 Amos 21 프로그램을 이용하여 구조방정식모형을 검증하여 다음 결과를 얻었다. 첫째, 유아의 긍정적 또래상호작용, 자기조절, 리더십 간에는 유의한 정적 상관관계가 나타났다. 둘째, 또래상호작용은 유아 리더십에 유의한 영향을 미치지 않았고, 자기조절은 유아 리더십에 긍정적인 효과가 있었다. 또래상호작용은 유아 자기조절에 긍정적인 영향을 미치며 또래상호작용이 유아 리더십에 미치는 영향 관계에서 자기조절은 유의한 매개효과 역할을 하는 것으로 나타났다. 이러한 결과는 유아의 리더십 교육에 있어 주목해야 할 요소로서 유아의 또래 상호작용과 자기조절의 중요성을 시사한다.

• 한국생활과학회지
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• 제15권2호
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• pp.251-259
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• 2006

The purpose of this study is to identify main effect of gender and expenditure, and interaction effect of gender by expenditure on satisfaction with foodservices of western restaurants. Accordingly, this study surveyed questionnaires concerning 20 measures of foodservice as well as major subject descriptors. The result of this study was as follows: KMO and Bartlett's test statistics showed that the data well fitted a factor analysis. Results of the factor analysis, average variance extracted estimates, and shared variance showed that the convergent and discriminant validities of 5 factors were supported, and Cronbach's alpha also showed that the internal consistencies of 5 factors were supported. But there was an interaction effect between independent variables and covariate on service quality factor. This study, therefore, used food decor factor, facility factor, food quality factor, and food value factor as dependent variables in two way 3$\times$2 design factorial ANCOVA. It was found that there were no main effects of gender and expenditure on those four factors. It was however revealed that there was an interaction effect of gender by expenditure on food decor factor.

• 동력기계공학회지
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• 제9권4호
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• pp.71-76
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• 2005

Marine structures are often in contact with inner or outer fluid as stern, ballast and oil tanks. The effect of interaction between fluid and structure has to be taken into consideration when we estimate the dynamic response of the structure appropriately. Fatigue damages can also be sometimes observed in these tanks which seem to be caused by resonance. Thin walled tank structures in ships which are in contact with water and located near engine or propeller where vibration characteristics are strongly affected by the added mass of containing water. Therefore it is essentially important to estimate the added mass effect to predict vibration characteristics of tank structures. But it is difficult to estimate exactly the magnitude of the added mass because this is a fluid-structure interaction problem and is affected by the free surface, vibration modes of structural panels and the depth of water. I have developed a numerical tool of vibration analysis of 3-dimensional tank structure using finite elements for plates and boundary elements for fluid region. In the present study, the effect of added mass of containing water, the effect of structural constraint between panels on the vibration characteristics are investigated numerically and discussed. Especially a natural frequencies by the fluid interaction between 2 panels and a breath mode of the water tank are focused on.

• 한국지진공학회:학술대회논문집
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• 한국지진공학회 2001년도 춘계학술대회 논문집
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• pp.120-127
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• 2001

Long term earthquake observations at different tunnel sites within a variety of alluvial soil deposits have demonstrated that a circular tunnel is liable to deform in such a way that its two diagonal diameters crossing each other expand and contract alternately. Based on this knowledge, the soil-tunnel interaction and isolation effect for this particular vibration mode is investigated. Interaction effect is considered with the condition of fixed tangential strain between the tunnel and the soil. Isolation effect embodied by covering up the tunnel with isolation materials is discussed as a possible measure for mitigating seismic damage to it. When Poisson`s ratio of isolation material decreases or the shear modulus ratios of the soil to isolation material become large, the isolation effect becomes bigger.

• 아시안잔디학회지
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• 제8권3호
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• pp.193-199
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• 1994

Effect pf rape seed oil cake compast (OM) active carbon(C) compound fertilizer (NPK) and magnesium sulfate (Mg) application on Zoysia koreana growth by lysimeter of 50cm soil column filled with a low fertility loam. Effect on growth was in order of OM>OM . NPK interaction> NPK . active carbon and Mg were not effective OM . NPK interaction effect was negative on leaf width and root dry matter yield. OM and OM . NPK interaction were most effective on rhizome growth. Their effect did not change the ratio of growth rates between aerial part and rhizome but change that between aerial part and root. Leaf width was most sensitive to the treatments.

• 복식문화연구
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• 제5권2호
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• pp.195-205
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• 1997

The purpose of this study was to identify the effect of genderand body cathexis on clothing behavior (interest in clothing and clothing satisfaction/dissatisfaction). The questionnaire were administered to 395 college students living in Jechon. Data were analyzed by frequency, factor analysis, t-test, ANOVA, two-way ANOVA, Duncan's Multiple Range Test and Pearson's Correlation. The results of this study were as follows : 1) body-cathexis was higher in men than women. In general, students were more satisfied with upper body parts than lower body parts. 2) There was no relationship between interest in cloghing and body-cathexis. But woman showed more interest in clothing than man, therefore sex showed main effect. And there was interaction between sex and body-cathexis on interest in clothing. 3) Clothing satisfaction was devided into aesthetic/economical/practical factors. Among three satisfaction factors, body cathexis has the main effect in economic factor, and there was no interaction. But in aesthetic factor, gender and body-cathexis showed interaction and body-cathexis showed main effect.