• Journal of Families and Better Life
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• v.19 no.2
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• pp.143-152
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• 2001

The purpose of this study was to investigate the effects of family stress on work stress and to examine the effects of family and work stress on psychological wellbeing in employed men and women. The analyses of the present study were based on a sample of 263 full-time employed men and 258 full-time employed women aged 30-49 in dual-earner families. There were significant gender differences in marital stress, parenting stress and psychological well-being with women reporting higher levels of stress. However, employed men and women experienced similar levels of work stress. The results from regression analyses showed that stress in the family domain contributed significantly to work stress. Both marital stress and parenting stress were significantly related to higher levels of work stress fro employed men and women. The findings of this study indicated that higher levels of marital stress and work stress were predictive of psychological well-being for men and women in dual-earner couples. Among employed women, marital stress and work stress were more highly related to psychological well-being than among employed men.

• Korean Journal of Occupational Health Nursing
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• v.24 no.2
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• pp.103-113
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• 2015

Purpose: This study was to construct a structural equational model for explaining and predicting job stress of intensive care unit (ICU) nurses based on the Integrated model of stress of Ivancevich and Matteson (1980). Methods: The subjects of this study were 220 nurses at ICU. The data were collected from August 5 to 30, 2013 through self-reporting questionnaire survey. Results: According to the hypothetical model of this study, perceived nursing practice environment, perceived role conflict, perceived transformational leadership and perceived self-esteem showed statistically significant effects on job stress of ICU nurses directly. Professional self-concept indirectly affect job stress of ICU nurses. In conclusion, job stress of ICU nurses was directly influenced by nursing practice environment, role conflict, transformational leadership and self-esteem. Professional self-concept of the relationships among variables did not have a direct impact on job stress. Conclusion: Based on the results of this study, it is needed to develop stress management measures and programs considering these variables in order to adequately manage job stress of ICU nurses.

• Tunnel and Underground Space
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• v.27 no.1
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• pp.39-49
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• 2017

The factor of safety (FOS) is commonly used as an index to quantitatively state the degree of safety of various rock structures. Therefore it is important to understand the definition and characteristics of the adopted FOS because the calculated FOS may be different according to the definition of FOS even if it is estimated under the same stress condition. In this study, four local factors of safety based on maximum shear stress, maximum shear strength, stress invariants, and maximum principal stress were defined using the Mohr-Coulomb and Hoek-Brown failure criteria. Then, the variation characteristics of each FOS along five stress paths were investigated. It is shown that the local FOS based on the shear strength, which is widely used in the stability analysis of rock structures, results in a higher FOS value than those based on the maximum principal stress and the stress invariants. This result implies that the local FOS based on the maximum shear stress or the stress invariants is more necessary than the local FOS based on the shear strength when the conservative rock mechanics design is required. In addition, it is shown that the maximum principal stresses at failure may reveal a large difference depending on the stress path.

• Journal of Home Health Care Nursing
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• v.23 no.2
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• pp.195-205
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• 2016

Purpose: The aims of this study were to describe the levels of personal coping resources, perceived organizational supports, and job stress, and to examine factors that affect job stress in hospital-based home care nurse practitioners. Methods: A cross-sectional survey was conducted. Data were collected from 170 subjects with a structured questionnaire from April to July, 2016 and analyzed using descriptive statistics, t-tests, One-way ANOVA, Pearson's correlation, and multiple regressions. Results: The means for personal coping resources, perceived organizational supports, and job stress were $3.7{\pm}0.43$, $3.4{\pm}0.55$, and $3.4{\pm}0.55$ out of 5, respectively. Personal coping resources and perceived organizational supports were significantly correlated. However, both had no associations with job stress. In the multiple regression analysis, the experiences of home care nursing and hospital location were found to be predictors of job stress. Both personal coping resources and perceived organizational supports were not statistically significant predictors of job stress. Conclusions: It is necessary to carry out organization-based educational programs and support systems aimed at enhancing personal abilities to cope with stress at work. Additionally, further studies are needed to identify other hospital-related characteristics that can lead to job stress in home care nurse practitioners.

• The Journal of Pediatrics of Korean Medicine
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• v.35 no.4
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• pp.96-111
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• 2021

Objectives The purpose of this study is to look for pathological mechanism of disease development caused by Taedok, by studying whether stress and diet in pregnant ICR mice affect the intestinal flora and IgA (Immunoglobulin A) concentration. Methods The mice were divided into 4 groups (n=5 per group) based on the concept of Taedok: the control group (G1), stress group (G2), capsaicin diet group (G3), high fat diet group (G4). We collected and analyzed intestinal flora from maternal feces and cecal flora from neonatal mice by group. Then, IgA concentration in the maternal feces and sIgA (secretory Immunoglobulin A) concentration in the cecal contents of newborn mice were analyzed. In addition, serum corticosterone was analyzed before and after stress application. Results Changes in maternal intestinal flora and neonatal mice cecal flora by stress and diet were observed. There were no significant changes in the IgA concentration in maternal feces and the sIgA concentration in the cecal contents of neonatal mice. No significant changes compared to the control group were observed between groups before and after applying stress. However, when comparing within one subject, a significant increase was confirmed after stress application in the stress group (G2). Conclusions Based on the results, we observed stress and diet in pregnant mice affect the intestinal flora of maternal and neonatal. We were able to interpret the pathological mechanism of Taedok based on the principle of interaction between mother and newborn intestinal flora.

• Geomechanics and Engineering
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• v.19 no.3
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• pp.201-215
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• 2019

A new approach of analyzing the displacements and stress of the surrounding rock for shallow tunnels excavated under non-axisymmetric displacement boundary conditions on a vertical surface is investigated in this study. In the proposed approach, by using a virtual image technique, the shear stress of the vertical ground surface is revised to be zero, and elastic solutions of the surrounding rock are obtained before stress revision. To revise the vertical normal stress and shear stress of horizontal ground surface generated by the combined action of the actual and image sinks, the harmonic functions and corresponding stress function solutions were adopted. Based on the Boussinesq's solutions and integral method, the horizontal normal stress of the vertical ground surface is revised to be zero. Based on the linear superposition principle, the final solution of the displacements and stress were proposed by superimposing the solutions obtained by the virtual image technique and the stress revision on the horizontal and vertical ground surfaces. Furthermore, the ground settlements and lateral displacements of the horizontal and vertical ground surfaces are derived by the proposed approach. The proposed approach was well verified by comparing with the numerical method. The discussion based on the proposed approach in the manuscript shows that smaller horizontal ground settlements will be induced by lower tunnel buried depths and smaller limb distances. The proposed approach for the displacement and stress of the surrounding rocks can provide some practical information about the surrounding rock stability analysis of shallow tunnels excavated under non-axisymmetric displacement boundary conditions on a vertical surface.

• Journal of the Society of Naval Architects of Korea
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• v.42 no.4 s.142
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• pp.388-395
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• 2005

A numerical procedure is proposed as a mesh-size insensitive structural stress definition that gives a stress state at a weld toe with relatively large mesh size. The structural stress values obtained using different finite element types, i.e. shell element and solid element, are examined for typical weld structures. The calculation procedures are performed using the balanced nodal forces and moments obtained from finite element solutions. A consistent formulation based on work equivalent argument has been implemented to transform the balanced nodal forces and moments from shell to line force and line moments at each nodal position. The mesh-insensitivity, the effect of distance $\delta$(where the stress is calculated) and the potential limitations of the structural stress method are examined for various types of weldments. Based on the results from this study, it is expected to develop a more precise stress estimation technique for fatigue strength assessment of welded structures.

• Transactions of the Korean Society of Mechanical Engineers A
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• v.21 no.11
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• pp.1844-1851
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• 1997

Displacement fields and interface stresses are obtained by modifying the potential energy functional with a penalty function which enforces the continuity of stresses at the interface of two-materials. Based on the displacement field and the interface stresses, a new methodology to generate a continuous stress field over the entire domain including the interface of the dissimilar materials has been proposed by combining the L$^{2}$ projection method of stress-smoothing and the Loubignac's iterative method of improving the displacement field. Stress analysis was carried out on two examples which are made of highly dissimilar materials. As a result of the analysis, it is found that the proposed method provides improved continuity of the stress field over the entire domain as well as predicting accurate nodal stresses at the interface. In contrast, the conventional displacement-based finite element method provides significant stress discontinuties at the interfaces. In addition, it was found that the total strain energy evaluated from the improved continuous stress field converge to the exact value as increasing the number of iterations in the proposed method.

• Transactions of the Korean Society of Mechanical Engineers A
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• v.28 no.7
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• pp.977-985
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• 2004

An evaluation of fatigue life of welded components is complicated due to various geometrically complex welding details and stress raisers in vicinity of weld beads, ego under cuts, overlaps and blow holes. These factors have a considerable influence on the fatigue strength of welded joints, as well as the welding residual stress which is relaxed depending on the distribution of local stress at the front of the stress raisers. To reasonably evaluate fatigue life, the effect of geometries and welding residual stress should be taken into account. The several methods based on the notch strain approach have been proposed in order to accomplish this. These methods, however, result in differences between analytical and experimental results due to discrepancies in estimated amount of relaxed welding residual stress present. In this paper, an approach that involves the use of a modified notch strain approach considering geometrical effects and a residual stress relaxation model based on experimental results was proposed. The fatigue life for five types of representative welding details, ego cruciform, cover plate, longitudinal stiffener, gusset and side attachment joint, are evaluated using this method.

• The Korean Journal of Health Service Management
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• v.7 no.4
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• pp.13-22
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• 2013

The purpose of this study was to identify the influencing types of stress and coping method among College and University students. The design for this study was descriptive using self-administered questionnaires. The data was collected from 1 July to 30 July 2012. 284 students in College and University located in Gyeongsangbuk-do. This data were analyzed by SAS 9.2 program using descriptive statistics, frequency, T-test, ANOVA, and Correlation analysis. The results were as follows. First, there was a difference between male and female in the level of stress, it was statistically significant(p<0.0001). Second, there was a remarkable difference in the level of stress between University and College students(p=0.0001). Third, in the evaluation of correlation, relation between study factor and career factor was statistically significant(0.59, p<0.001). However there was no positive correlation between the five stress-induced factors and problem-based handling way of stress. On the other hand, there was strong positive correlation between the five stress-induced factors and emotional-based coping method of stress(p<0.01).