• 한국생산제조학회지
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• 제9권5호
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• pp.47-57
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• 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
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• 제24권9호
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• pp.2220-2227
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• 2000

In this paper, dynamic photoelastic hybrid method is developed and its validity is certified. The dynamic photoelastic hybrid method can be used on the obtaining of dynamic stress intensity factors and dynamic stress components. The effect of crack length on the dynamic stress intensity factors is less than those on the static stress intensity factors. When structures are under the dynamic mixed mode load, dynamic stress intensity factor of mode I is almost produced. Dynamic loading device manufactured in this research can be used on the research of dynamic behavior when mechanical resonance is produced and when crack is propagated with the constant velocity.

• 아동학회지
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• 제21권4호
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• pp.35-50
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• 2000

The objective of this research was to determine the relative impact of demographic variables and ecological factors on the parenting stress of dual earner families. Subjects were 318 fathers and 405 mothers who completed the questionnaire on parenting stress and ecological factors. Results showed that mothers perceived high parenting stress compared with fathers. Degree of satisfaction with child care was a significant correlate of parenting stress. Demographic and ecological factors were also important in understanding the variation in parenting stress of dual earner families. These findings imply that the formal child care systems and parent education programs are needed for working parents.

• 재활간호학회지
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• 제13권2호
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• pp.123-131
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• 2010

Purpose: This study was aimed at identifying the levels of parenting stress among mothers of children with cerebral palsy and factors influencing parenting stress. Method: The research design was cross-sectional survey. Data were collected from 122 mothers of hospitalized children (under 15 years of age) with cerebral palsy at the Y medical center using the questionnaires. The data were analyzed using one way analysis of variance with Scheffe test for post-hoc analysis or t-test, Pearson correlation, and stepwise multiple regression. Results: The mean score of parenting stress was 2.52 (SD=0.79; range: 1~4). The father's participation, mother's parenting hours, self-esteem and social support were significant predictors of parenting stress, significantly accounting for the 33.3% variance (F=16.118, p<.001). Conclusion: It is essential for health professionals to consider the aforementioned four factors when developing interventions to reduce parenting stress for mothers of children with cerebral palsy.

• 디지털융복합연구
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• 제15권2호
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• pp.405-409
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• 2017

본 연구는 종단적 연구를 통하여 융복합시대 에코부머 세대의 직업 스트레스 변화궤적을 추정하여 예측요인을 밝혀냄으로써 직업 스트레스 정도와 그 변화 따라서 개인의 경험하는 직업 스트레스 요인을 파악하여 향후 우리나라의 사회 중심이 될 에코부머 세대의 직업 스트레스로 인한 심리적 부담 완화를 위한 사회복지 개입 시 활용할 수 있는 기초자료를 얻고자 한다. 본 연구는 2차 자료를 활용한 종단연구로서 한국복지패널 1차년도 ~ 7차년도 데이터를 잠재성장모형(LGM)을 적용하여 분석 하였다. 에코부머 세대의 직업 스트레스 예측요인을 확인한 결과 자아존중감으로 나타났으며, 이는 대부분 에코부머 세대의 경우 초기 측정시점이 대부분 학생에 해당되어 직업 스트레스의 수준이 덜했으나, 시간의 변화에 따라 직업에 대한 부담이 점차 증가한 것으로 확인하였다. 본 연구에서 에코부머 세대의 직업 스트레스가 어떻게 변화하는지 또한 그 변화의 예측요인에 대한 실증적 근거를 제시함으로써 에코부머 세대의 직업 스트레스에 대한 이해와 기초를 마련하였다는 점에 그 의의가 있다.

• 산업경영시스템학회지
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• 제31권4호
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• pp.41-48
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• 2008

The purpose of this study was to investigate the job stress factors that were related to the general characteristics, work characteristics, and health characteristics of the workers at distribution industry. The survey of job stress measurement scale for Korean employee which was developed by KOSHA and OSHRI in 2003 was used for this study. Three hundred and fifty workers at distribution industry participated in this study, and among them 326 responses were analyzed for this study due to the unreliability and insincerity of responses. Eight job stress factors like physical environment, self-control for the job, job unsecure, organization system, workplace culture, compensation for the job, relationship to the superior, and job requirement were analyzed. The results showed that the stress because of self control for the job was relatively higher than that of other industry workers. However, the stress because of physical environment, job requirement, job unsecure, organization system and compensation for the job was relatively lower than that of other industry workers. The female workers felt more stress than male workers in compensation for the job and workplace culture factors at distribution industry. The delivery and carrying job workers were more stressful than those of other jobs at distribution industry because of physical environments and self-control for the job. The non-regular job workers were more stressful than regular job workers in many stress factors like self-control for the job, job unsecure, organization system and compensation for the job.

• 대한기계학회논문집
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• 제17권2호
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• pp.359-370
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• 1993

Up to now, most studies are on interface crack problems in isotropic-isotropic dissimilar materials, but it seems to be not so much on anisotropic dissimlar materials. In this study, the stress intensity factors for an interface crack in anisotropic dissimilar materials are analysed using author's proposed extrapolation method by BEM and we have done a parametric study about material properties or shapes of crack affecting to the stress intensity factors. However, as there are not other's comparable numerical results on these anisotropic dissimilar materials to the best of author's knowledge, the reliability of the present results was proved by following two methods. The first is considering the asymptotic characteristic about stress intensity factors for an interface crack in anisotropic materials when the ansiotropic material approachs to the isotropic material. The second is considering the discontinuity of stress intensity factors between of a crack in an identical homogeneous anisotropic material and an interface crack in anisotropic dissimilar materials.

• 산경연구논집
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• 제13권8호
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• pp.1-7
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• 2022

Purpose: The present study concentrates on the issues that affected the employees directly and acted as stress factors. These stress factors affect how the employees perform while undertaking their duties. Furthermore, this study evaluated how the involvement of the corporate counsel affected the company by enhancing the productivity of the employees. Research design, data and methodology: The research design of this research is a literature content analysis and method for data handling should be described, and the resultant combination of the studies should include the consistency measures for every meta-analysis. Specify any risk assessment of bias that may impact the cumulative evidence, such as the publication bias and the selective reporting within studies. Results: The finding shows that change in the location of employees' organizational restructuring and the introduction of new technologies also contributed to significant organizational stress factors. These results show a substantial correlation between the magnitude of the adjustments' effects on employees' performance. Conclusions: The current study strongly concludes that counselors, through their prowess, can analyze and evaluate the stress factors that are evident among the employees and in the organization. Some of these factors may be office layout, organizational codes of ethics, organization rules, and employees' personal challenges.

• 대한기계학회논문집
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• 제16권6호
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• pp.1216-1220
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• 1992

본 연구에서는 Lee등의 연구를 일반화하기 위하여 급수 형태의 등각사상함수 로 표현되는 일반형태의 커스프형 강체함유물이 존재하는 경우에 대하여 복소 포텐셜 함수와 TSIF에 대한 일반해를 구하기로 한다.

• 한국정밀공학회지
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• 제17권5호
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• pp.180-185
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• 2000

An interface V-notched crack problem can be formulated as a eigenvalue problem. there are the eigenvalues which give stress singularities at the V-notched crack tip. The RWCIM is a method of calculating the eigenvector coefficients associated with eigenvalues for a V-notched crack problem. Obtaining the stress intensity factors for an interface crack in dissimilar materials is examined by the RWCIM. The results of stress intensity factors for an interface crack are compared with those of the displacement extrapolation method by the BEM