• The Korean Journal of Health Service Management
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• v.8 no.2
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• pp.233-244
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• 2014

This study aims to investigate the effects of adolescent's academic stress and their experience of school bulling victim on suicidal ideation, and the meditating effect of self-esteem among variables by utilizing the path analysis. Quantitative survey research was conducted with 1735 students attending primary, middle and high school to identify the following the key results. First, adolescent's academic stress directly influenced their suicidal ideation and its' effect was indirectly mediated by the subjects's self-esteem. Second, the relationship between the experience of school bullying victim and suicidal ideation was partly mediated by self-esteem. In other words, the severer academic stress in youth and the experience of bullying victim were, the higher suicidal ideation were; however, the adolescent's high self-esteem played a mediating role in lowering their suicidal ideation by increasing the ability of overcoming difficulties and risks.

• Korean Journal of Human Ecology
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• v.7 no.2
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• pp.1-10
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• 1998

The purpose of this study are to examine the influential variables between general character, family system, coping strategies, social support and stress of main caregivers for disordered elderly family. This study was conducted by interviewing of 177 family-members care to giving disordered elderly families in Taegu and Kyeongbuk province. The data were analyzed with the SPSS statistical package using frequency and percentage, multiple regression and path analysis. The results of this study were as follow : The variables influencing stress related to the disordered elderly family are the degree of disorder (${\beta}=.348^{***}$), caring-time-per day (${\beta}=.303^{***}$), employment status of main caregivers (${\beta}=.223^{***}$), social support (${\beta}=.241^{**}$), relational coping strategies (${\beta}=.199^{**}$), problem-avoidance coping strategies (${\beta}=.327^{***}$). Thus, in disordered elderly families, a high-stress situation arises with a highly-educated caregiver when problem-avoidence coping strategies or relational coping strategies are used or when daily caring time is great. A low-stress situation results when the caregiver is employed and the social support level is high.

• Geomechanics and Engineering
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• v.9 no.5
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• pp.669-685
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• 2015

A three-dimensional elastoplastic constitutive model, also known as a UH model (Yao et al. 2009), was developed to describe the stress-strain relationship for normally consolidated and over-consolidated soils. In this paper, an acoustic tensor and discriminator of bifurcation for the UH model are derived for the strain localization of saturated clays under undrained and fully and partially drained conditions. Analytical analysis is performed to illustrate the points of bifurcation for the UH model with different three-dimensional stress paths. Numerical analyses of cubic specimens for the bifurcation of saturated clays under undrained and fully and partially drained conditions are conducted using ABAQUS with the UH model. Analytical and numerical analyses show the similar bifurcation behaviour of overconsolidated clays in three-dimensional stress states and various drainage conditions. The results of analytical and numerical analyses show that (1) the occurrence of bifurcation is dependent on the stress path and drainage condition; and (2) bifurcation can appear in either a strain-hardening or strain-softening regime.

• Anxiety and mood
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• v.12 no.1
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• pp.28-33
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• 2016

Objective : One of the aims of this study was to confirm the relationship in firefighters who have a high risk of developing posttraumatic stress disorder. We also explored the mediation effects of resilience and posttraumatic growth (PTG) on the association between traumatic experiences and posttraumatic stress symptoms. Methods : A total of 677 firefighters were assessed in terms of the intensity of job-related traumatic experiences using the Visual Analogue Scale. They completed the Korean version of the Posttraumatic Growth Inventory (PTGI), the Korean version of the Impact of Event Scale-Revised (IES-R), and the Korean version of the 10-item Connor-Davidson Resilience Scale (CD-RISC-10). Results : The intensity of traumatic experiences was significantly negatively related to the CD-RISC-10 score, but it was positively related to the PTGI and the IES-R scores. The CD-RISC-10 score had a significantly positive correlation with the PTGI score, but it was negatively correlated to the IES-R score. Path analyses revealed that resilience and PTG independently mediated the association between traumatic experiences and posttraumatic stress symptoms. Conclusion : These results suggest that traumatic experiences contribute to posttraumatic stress symptoms and that these impacts may be mediated through resilience and PTG.

• Structural Engineering and Mechanics
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• v.35 no.3
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• pp.283-299
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• 2010

This paper addresses the numerical simulation of fatigue crack growth in arbitrary 2D geometries under constant amplitude loading by the using a new finite element software. The purpose of this software is on the determination of 2D crack paths and surfaces as well as on the evaluation of components Lifetimes as a part of the damage tolerant assessment. Throughout the simulation of fatigue crack propagation an automatic adaptive mesh is carried out in the vicinity of the crack front nodes and in the elements which represent the higher stresses distribution. The fatigue crack direction and the corresponding stress-intensity factors are estimated at each small crack increment by employing the displacement extrapolation technique under facilitation of singular crack tip elements. The propagation is modeled by successive linear extensions, which are determined by the stress intensity factors under linear elastic fracture mechanics (LEFM) assumption. The stress intensity factors range history must be recorded along the small crack increments. Upon completion of the stress intensity factors range history recording, fatigue crack propagation life of the examined specimen is predicted. A consistent transfer algorithm and a crack relaxation method are proposed and implemented for this purpose. Verification of the predicted fatigue life is validated with relevant experimental data and numerical results obtained by other researchers. The comparisons show that the program is capable of demonstrating the fatigue life prediction results as well as the fatigue crack path satisfactorily.

• Korean Journal of Occupational Health Nursing
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• v.32 no.3
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• pp.99-110
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• 2023

Purpose: This study examined the job stress and perception of unit managers' authentic leadership on clinical nurses' intention to stay in nursing. Methods: This descriptive cross-sectional study utilized self-administered questionnaires. The study recruited a convenience sample of 211 clinical nurses from threertiary hospitals in South Korea. The survey was conducted between July and August 2021. The collected data underwent hierarchical multiple regression analyses. Results: The regression analyses indicated that clinical nurses' intention to stay was significantly associated with job stress (B=-0.06, 95% CI [-0.09, -0.04]), six or more years of clinical practice (B=0.60, 95% CI [0.13, 1.07]), men (B=0.87, 95% CI [0.30, 1.44]), and being placed on their desired nursing unit (B=0.39, 95% CI [0.27, 0.76]). Intention to stay was not found to be associated with authentic leadership by the unit managers. Conclusion: It is essential to implement workplace health promotion programs to prevent and reduce job stress among nurses to retain proficient clinical nurses. Additionally, nursing workforce management strategies tailored to the specific sex and career path of nurses are necessary. Moreover, careful consideration should be given to nursing unit placements that align with the individual aptitudes of nurses.

• Journal of Families and Better Life
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• v.25 no.2 s.86
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• pp.13-21
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• 2007

This study investigates the effect of related variables (types of job, term of employment, working time, job satisfaction, payment satisfaction and, working stress) on the sense of hopelessness felt by married males. The study was conducted on 237 male employees residing in Busan, and measurement devices for study were job-related variables, working stress and hopelessness scale. The study used SPSS 12.0 program to analyze data, and conducted item analysis and reliability test for measure establishment. Average, Standard deviation, one-way ANOVA, scheffe-test, Pearson correlation, and path analysis through regression analysis were conducted pertaining to research subject. The result of this study is as follows; First, working stress has significant difference upon types or working, term of employment and job satisfaction. Office workers relatively have longer term of employment and workers who are less satisfied with job suffer from more working stress. Second, hopelessness has significant difference upon term of employment, job satisfaction and payment satisfaction among job-related variables. Thus, hopelessness is relatively less when term of employment is shorter and job satisfaction and payment satisfaction is higher. Third, variables which affect directly to working stress and hopelessness are term of employment $(\beta=.245)$, payment satisfaction $(\beta=-.182)$ and working stress $(\beta=.189)$, and types of job, term of employment and job satisfaction influences hopelessness indirectly through working stress. In conclusion, workers are more negative when term of employment is longer, payment satisfaction is less and working stress is higher. Moreover, longer term of employment and less job satisfaction contribute to higher working stress and eventually influence hopelessness. Term of employment affects the most to hopelessness $(\beta=.274)$, and it is followed by working stress $(\beta=.189)$ and payment satisfaction $(\beta=-.182)$.

• Korean Journal of Occupational Health Nursing
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• v.21 no.3
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• pp.247-257
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• 2012

Purpose: This study is designed to identify major factors that affect morale among staff of long-term care insurance in National Health Insurance Corporation. Methods: In order to collect the data, a survey was conducted by using the structured questionnaire based on 161 staff members of long-term care insurance of 50 long-term care operation centers, which were randomly selected by the table of random numbers in the whole centers of National Health Insurance Corporation from September 1 to 30, 2011. As for the data analysis, SPSS 18.0 was used to conduct the descriptive statistics, t-test, ANOVA, Pearson correlation coefficient, mutiple regression, and path analysis. Results: The average point of morale was 3.37, and had a negative correlation with the job stress, while it had a positive correlation with the social support, professional identity, and self-efficacy. Job stress, social support, and professional identity have a significant effect on morale among the independent variables. These variables have significant effects on morale, and also have a positive effect on self-efficacy. The findings show that self-efficacy mediates the process of morale. Conclusion: In this study, the factor which influences the morale was identified. It turned out that the morale could be improved by reinforcing the professional identity, managing the health status as well as rotating the working place. As such, it expects both the improvement of long-term care insurance services outcome and its quality through the morale management.

• Transactions of the Korean Society of Mechanical Engineers A
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• v.34 no.7
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• pp.813-820
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• 2010

The vertical roller mill is important for machine grinding and mixing various crude materials in the process of producing Portland cement. A vertical roller mill is subjected to cyclic bending stress because of the roller load. Because of the cyclic bending stress, only $4{\times}10^6-8{\times}10^6$ cycles are achieved instead of $4{\times}10^7$ cycles. The stress also causes fractures at the edge of grinding path of the outer roller. The expenses incurred in repairing the grinding path amounts to 30% of the total maintenance cost. Therefore, it is desirable to redesign the vertical roller mill in order to reduce the expenses incurred in repairing the roller. In this study, artificial neural networks (ANNs) were applied in order to solve the multiobjective optimization problem for vertical roller mills by using the function approximation ability of ANNs. To learn and generalize ANNs, the maximum and minimum stresses were estimated from the results of the finite-element analysis of a vertical roller mill. Thus, ANNs could be applied to solve the multiobjective optimization problem.

• Journal of Korean Society of Steel Construction
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• v.26 no.4
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• pp.311-322
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• 2014

Concrete filled tubular structure should be installed diaphragms for moment connection. However internal and through diaphragm should be special welded when connected to column tube. The other hand, that has become increase of stress concentration and extend of construction error. Therefore, In this study the seismic performance of beam to column connections with External Diaphragms and implement cycle loading experiment. we had evaluated seismic performance with mentioned experiment which is concrete filled or not, variable shapes, to be welded or not of diaphragm. Also, formula of strength of external diaphragm was analyzed and looked into adequacy with regard to formula of tension strength.