• 아동학회지
• /
• 제28권2호
• /
• pp.91-113
• /
• 2007

The purpose of this study was to develop the Resilience Scale for Children(RSC) and to evaluate its reliability and validity. The RSC was administered to 482 children in grades 4 through 6. Factor analysis of the 30 item scale demonstrated Cronbach's ${\alpha}=.89$ for internal consistency of total items. The results of the confirmatory factor analysis supported a five-factor structure. Retest stability was acceptable for the five-factors. Tests of the present scale for criterion-related validity compared favorably with Self-Perception Profile for Children (Lee, et al., 1992) and the Stress Coping Behavior Scale for Children (Kim and Kang, 2003) confirming its applicability to elementary school students for assessment of resilience.

• Journal of the Korean Statistical Society
• /
• 제28권1호
• /
• pp.73-92
• /
• 1999

In Bayesian model selection or testing problems, one cannot utilize standard or default noninformative priors, since these priors are typically improper and are defined only up to arbitrary constants. The resulting Bayes factors are not well defined. A recently proposed model selection criterion, the intrinsic Bayes factor overcomes such problems by using a part of the sample as a training sample to get a proper posterior and then use the posterior as the prior for the remaining observations to compute the Bayes factor. Surprisingly, such Bayes factor can also be computed directly from the full sample by some proper priors, namely intrinsic priors. The present paper explains how to derive intrinsic priors for simple tree ordered exponential means. Some numerical results are also provided to support theoretical results and compare with classical methods.

• Structural Engineering and Mechanics
• /
• 제59권1호
• /
• pp.15-36
• /
• 2016

The components of the seismic behavior factor of RC frames are expected to change as structural redundancy increases. Most researches indicate that increasing redundancy is desirable in response to stochastic events such as earthquake loading. The present paper investigated the effect of redundancy on a fixed plan for seismic behavior factor components and the nonlinear behavior of RC frames. The 3D RC moment resistant frames with equal lateral resistance were designed to examine the role of redundancy in earthquake-resistant design and to distinguish it from total overstrength capacity. The seismic behavior factor and dynamic behavior of structures under natural strong ground motions were numerically evaluated as the judging criteria for structural seismic behavior. The results indicate that increasing redundancy alone in a fixed plan cannot be defined as a criterion for improving the structural seismic behavior.

• Steel and Composite Structures
• /
• 제49권3호
• /
• pp.271-280
• /
• 2023

In this study, the three-dimensional finite element method is used to analyze the behavior of corner cracks in finite-thickness plates repaired with a composite patch. The normalized stress intensity factor at the crack front is used as fracture criterion. Comparison of stress intensity factor values at the internal and external positions of repaired quarter-elliptical corner crack was done, for three repair techniques. The influence of mechanical and geometrical properties of the adhesive layer and the composite patch on the variation of the stress intensity factor (SIF) at the crack-front was highlighted. The obtained results show that the application of double patch leads to a remarkable reduction of SIF at the crack front, compared to facial and lateral repairs.

• 터널과지하공간
• /
• 제18권1호
• /
• pp.33-43
• /
• 2008

지반침하 대상지역 암반의 부피팽창률에 대한 측정방법은 국 내외적으로 아직까지 규정된 바는 없으며, 그동안 현장에서 화약발파에 의한 암반의 부피증가율로써 부피팽창률을 적용하여 시용하여 왔다. 하지만 이렇게 제시된 부피팽창률은 일정한 기준으로 분류되지 않았을 뿐만 아니라, 각각에서 제시된 값들은 암종에 따라 부피팽창률 범위 차이가 있기 때문에 지반침하 대상지역에 그대로 적용하기에는 다소 무리가 있다. 따라서 본 연구에서는 편마암, 석회암 및 셰일을 대상으로 붕락대에 영향을 미칠 수 있는 파쇄암의 적재 형태에 따른 부피팽창률과 응력에 따른 부피팽창률을 산정하기 위해 파쇄암이 적재된 상태에서 일정한 하중을 가하여 실내실험을 실시하였다.

• 한국자동차공학회논문집
• /
• 제14권4호
• /
• pp.59-67
• /
• 2006

Recently, application of friction welded SUH35/SUH3 is increasing in the manufacturing process of automotive engine valves For securing its reliability and a reasonable strength evaluation method, it is necessary to assess stress singularity under the residual stress condition on the friction welded interface between dissimilar materials. In this paper, strength evaluation method of friction welded materials was investigated by boundary element method and static tensile testing. An advanced method of quantitative strength evaluation for SUH35/SUH3 friction welded material is to be suggested by establishing fracture criterion by using stress singularity factors.

• 대한기계학회논문집B
• /
• 제22권8호
• /
• pp.1091-1100
• /
• 1998

Longitudinal distributions of the extinction coefficient and concentrations of hazardous gases in a long tunnel located in urban area haute been predicted theoretically. The results are compared with design criteria. It is found that the maximum concentrations of both CO and $NO_X$ in the tunnel are lower than the design criteria. However, the maximum extinction coefficient, generally considered to be a governing factor for ventilating flow rate, is shown lower than the design criterion. Therefore, it is suggested that the design criterion of the extinction coefficient should be increased to a slightly larger value.

• 한국생산제조학회지
• /
• 제9권5호
• /
• pp.47-57
• /
• 2000

In this study, a fundamental approach to make clear the mechanism of the mutual interference and coalescence of stress fields in the vicinity of two crack tips on the process of their slow growth, using boundary element method. Automatic generation of quadratic discontinuous elements along both of the crack boundaries which can be defined by an arbitrary piece-wise straight geometry. The direction of the crack-extension increment is predicted by the maximum principal stress criterion, corrected to account for the discreteness of the crack extension. Along the computed direction, the crack is extended one increment. Automatic incremental crack-extension analysis with no remeshing, computation of the stress intensity factors by J-integral. Numerical stress intensity factors for two growing cracks in plane-homogeneous regions were determined.

• 대한기계학회논문집A
• /
• 제21권3호
• /
• pp.414-422
• /
• 1997

The characteristics on the extension of the CED(Crack Energy Density) concept to the interface kinked crack problems in a dissimilar are examined. Each mode contributions of CED are found by symmetric and antisymmetric conponents and domain independent integrals. Finite element calculation is carried out to simulate the interface kinked crack growth on a bimaterial. The focus is the establishment of fracture criterion with CED and finding the orientation of crack extension. From the results, a prediction about the extension behavior of an interface kinked crack can be done. And we show that CED can be a parameter to indicate fracture criterion at an interface kinked crack.

• 한국신재생에너지학회:학술대회논문집
• /
• 한국신재생에너지학회 2008년도 춘계학술대회 논문집
• /
• pp.91-94
• /
• 2008

In this paper, we searched for impact factors by brainstorming and calculated the weights of them using the Analytic Hierarchy Process(AHP) method in order to develop energy technology strategy for the future. AHP is a useful method for evaluating multi-criteria decision making problems. We selected 3 criteria(possibility of success for developing technology, application of the technology, technical spin-off) and 10 sub-criteria. According to the result in this study, the most important sub-criterion is the possibility of commercialization, the second is the possibility of developing the fundamental technology, and the third is the possibility of convergence technology. The other side, the lowest important sub-criterion is the difference of technical standards as compared with advanced countries.