• 한국학교ㆍ지역보건교육학회지
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• 제16권3호
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• pp.65-78
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• 2015

Objectives: The purpose of this study was to investigate self esteem and stress of students at their universities for the development of a program related to school life and guidance. Methods: The survey were carried out in 5 universities located in Gyounggi Do, Gyungbuk Do, Busan city and Daegu city from 2014. October 1. to November 30. Out of a total of 500 Questionnaires answered by 500 students, 489 Questionnaires, were analyzed with SPSS version 12.0. Results: The total mean of the self esteem point of college student's school living was $3.41{\pm}0.44$ points. The total mean of the general stress point of college students was $2.67{\pm}0.52$ points. Affecting factors of the self-esteem of subjects(multiple regression analysis) were important things of school living(p<0.05), human and friendship(p<0.05), protector's job(p<0.001), home economic states(p<0.001), and friendship(p<0.001). Based on multiple regression analysis, affecting factors of the stress of subjects were important things of school living(p<0.05), human and friendship(p<0.05), religion(p<0.001), protector's job(p<0.001), friendship(p<0.001), and arbeit job(p<0.05). Conclusions: The results of this study help to provide a basis for development of a strategy to improve the self-esteem and solve problems of stress for university students. Also relevant programs should be developed and provided by related authorities and universities.

• 아동학회지
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• 제31권4호
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• pp.159-177
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• 2010

This study sought to identify the solutions that private-kindergarten directors use in dealing with their work-related stress. The respondents for this study were 200 kindergarten directors in Busan, Ulsan and Gyoung-Nam province. Surveys were issued and 162 were returned and were subject to statistical analysis. The survey consisted of a total of 45 questions about work-related stress and the strategies used to cope with their work situations. The data collected data were analyzed through the SPSS 12.0 program. As a result of this study, it can be argued that, firstly, in terms of the strategies to reduce work-related stress by directors, it is best to address these issues psychologically, directly and physically. Secondly, through this process, significant differences stemming from the age of directors (p < .01) were observed, while there were no significant differences in terms of educational level and management experience in these statistics. Finally, our results indicated that as a result of confirming the differences among effective plans according to total marks of the level of job stress recognition for privatekindergarten directors, there are meaningful and significant differences in the level of job stress recognition in respect to a physical effective plan (p < .05), a negative plan (p < .01) and a direct effective plan (p < .05).

• Tribology and Lubricants
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• 제11권2호
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• pp.24-33
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• 1995

This paper presents the contact stress distributions between the multi-contact bodies and the total reaction forces for various types of contact geometry for multi-load slewing ring bearings. The FEM results indicate that the slope of the roller type of slewing ring bearing has slightly steeper than that of the ball type. This is because the roller type wire race bearings is stiffer than the ball type bearing. The total reaction force of ball type slewing bearing shows much higher than that of wire race slewing bearings.

• Structural Engineering and Mechanics
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• 제35권6호
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• pp.677-697
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• 2010

This paper focuses on geometrically non-linear static analysis of a simply supported beam made of hyperelastic material subjected to a non-follower transversal uniformly distributed load. As it is known, the line of action of follower forces is affected by the deformation of the elastic system on which they act and therefore such forces are non-conservative. The material of the beam is assumed as isotropic and hyperelastic. Two types of simply supported beams are considered which have the following boundary conditions: 1) There is a pin at left end and a roller at right end of the beam (pinned-rolled beam). 2) Both ends of the beam are supported by pins (pinned-pinned beam). In this study, finite element model of the beam is constructed by using total Lagrangian finite element model of two dimensional continuum for a twelve-node quadratic element. The considered highly non-linear problem is solved by using incremental displacement-based finite element method in conjunction with Newton-Raphson iteration method. In order to use the solution procedures of Newton-Raphson type, there is need to linearized equilibrium equations, which can be achieved through the linearization of the principle of virtual work in its continuum form. In the study, the effect of the large deflections and rotations on the displacements and the normal stress and the shear stress distributions through the thickness of the beam is investigated in detail. It is known that in the failure analysis, the most important quantities are the principal normal stresses and the maximum shear stress. Therefore these stresses are investigated in detail. The convergence studies are performed for various numbers of finite elements. The effects of the geometric non-linearity and pinned-pinned and pinned-rolled support conditions on the displacements and on the stresses are investigated. By using a twelve-node quadratic element, the free boundary conditions are satisfied and very good stress diagrams are obtained. Also, some of the results of the total Lagrangian finite element model of two dimensional continuum for a twelve-node quadratic element are compared with the results of SAP2000 packet program. Numerical results show that geometrical nonlinearity plays very important role in the static responses of the beam.

• 대한용접접합학회:학술대회논문집
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• 대한용접접합학회 2002년도 Proceedings of the International Welding/Joining Conference-Korea
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• pp.378-383
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• 2002

In previous study, the decrease and recovery of total stiffness in welded structure was discussed on the basis of experimental examination through tensile loading and unloading test of welded specimen. The recovery of structure stiffness was caused by the release of welding residual stress through mechanical loading. In this study, analysis model that is indispensable for the effective application of MSR method was established on the basis of test and measurement result. Thermal elasto-plastic analysis for welding process was performed by non-coupled analysis. Analysis results of welding process were transfer to elasto-plastic model for tensile loading & unloading by restart technique. In elasto-plastic analysis model for mechanical loading & unloading, hardening appearance of weld metal was considered by rezoning technique and tying technique was used for JIG condition of test machine.

• International Journal of Korean Welding Society
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• 제2권1호
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• pp.29-32
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• 2002

In previous study, the decrease and recovery of total stiffness in welded structure was discussed on the basis of experimental examination through tensile loading and unloading test of welded specimen. The recovery of structure stiffness was caused by the release of welding residual stress through mechanical loading. In this study, analysis model that is indispensable for the effective application of MSR method was established on the basis of test and measurement result. Thermal elasto-plastic analysis for welding process was performed by non- coupled analysis. Analysis results of welding process were transfer to elasto-plastic model for tensile loading & unloading by restart technique. In elasto-plastic analysis model for mechanical loading & unloading, hardening appearance of weld metal was considered by rezoning technique and tying technique was used for JIG condition of test machine.

• International Journal of Advanced Culture Technology
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• 제11권2호
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• pp.256-266
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• 2023

The purpose of this study is to investigate the relationship between stress and school life adaptation according to the degree of participation in physical education class and perception of middle school students. In order to achieve this research objective, the subjects of this study were sampled using cluster random sampling from male and female students attending middle schools in Gwangju Metropolitan City and Jeollanam-do in 2020. 150 males and 150 females, a total of 300 people were sampled. The statistical analysis used for data analysis was frequency analysis, exploratory factor analysis, reliability analysis, and multiple regression analysis using SPSS Windows 21.0 Version. The conclusions obtained in this study through data analysis by such methods and procedures are as follows. First, it was found that middle school students' participation in physical education classes and perceptions had a partial effect on stress. Second, it was found that the degree of participation and awareness of middle school students' physical education class had a partial effect on their adaptation to school life. Third, middle school students' stress was found to have a partial effect on school life adaptation.

• 임상간호연구
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• 제24권3호
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• pp.347-355
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• 2018

Purpose: The purpose of this study was to understand morality identity, occupational stress and authentic leadership and identify factors contributing to turnover intention among intensive care unit (ICU) nurses. Methods: Data were collected from 230 nurses at the university hospitals in Daegu, Ulsan and Busan between February 15 and March 23, 2017. Instruments measuring turnover intention, moral identity, occupational stress, and authentic leadership were utilized. Statistical analysis included t-test, ANOVA, Pearson correlational analysis, and hierarchical regression analysis. Results: A total of 207 nurses in ICU participated in this study. The power of explanation with age and dependents on turnover intention was 4.1%. With inclusion of occupational stress, moral identity, and authentic leadership factors put into the model, further 20.4% was explained. The explanatory power of the turnover intention in the final model was 23.6% (F=11.63 p<.001), and occupational stress was the key factor explaining turnover intention (${\beta}=.28$, p<.001). Predictive factors contributing to turnover intention were age, occupational stress, moral identity, and authentic leadership in final model. Conclusion: These findings demonstrated occupational stress, moral identity and authentic leadership as critical factors contributing turnover intention of ICU nurses. It is necessary to promote nursing manager's authentic leadership, and to encourage moral identity in ICU nurses. In addition, providing intervention programs to reduce occupational stress for ICU nurses is necessary.

• 한국안전학회지
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• 제37권1호
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• pp.64-69
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• 2022

The study measured a subway construction worker's Macpa stress by Heart Rate Variability measuring instrument and conducted a survey of Korean job stress from subway construction workers. Also, the study analyzed the relationship between Macpa stress index and Korean job stress result and suggested managing stress method for each item. According to National Statistical Office data, the first line subway in Seoul was started to open in 1974. The extended total length is 996 kilometers until 2019. Many aged workers are currently working at subway construction sites due to the avoidance of young workers since the past until now. It means that the elderly has a substantial portion among subway construction workers. The productivity has been adversely affected by health problems due to the aging of workers, job stress due to heavy work, and personal health problems. So, the regulation and policies on job stress health management are being strengthened. The data were measured Macpa stress by machine measuring heart rate variability and conducted Korean job stress survey(shortened) from Sa-sang to Ha-dan line Busan subway construction workers for analyzing the relationship. Independent variable were age, job duration, job position, employment type, working type in this study. Macpa's dependent variable was stress index and Korean job stress survey(shortened)'s dependent variables were job requirements, job autonomy, relationship conflict, job instability, organizational structure, inappropriate compensation, working place culture, and total score. SPSS 12.0 K Statistics Program was used for statistical analysis. Kruskal-wallis test, a nonparametric statistical analysis, was used because the data are difficult to be assumed as normal distribution. As a result, the paper indicated the significant correlation between Macpa stress index and Korean job stress(short version). The elderly workers presented higher Macpa index and higher job stress due to aging and heavy-duty work. The majority workers were daily workers who had unstable working condition and uncertainty about the future. The study suggested a manual that could reduce job stress for subway construction workers and future study deriving management tool through analyzing job stress factor is necessary.

• 대한한방내과학회지
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• 제42권3호
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• pp.293-307
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• 2021

Objectives: This study investigates the effects and safety of Bojungikgi-tang for stress urinary incontinence by systemic review and meta-analysis of randomized controlled trials (RCTs). Methods: RCTs were selected from articles published until December 2019 in seven domestic and foreign databases. The quality of the literature was evaluated using Cochrane's risk of bias (RoB) tool, and RevMan 5.3 was used to synthesize the results. Results: A total of 694 patients with stress urinary incontinence participated in eight RCTs. Meta-analysis showed that the total effective rate of treatment that combines pelvic floor muscle training (PFMT) and Bojungikgi-tang was significantly higher than that of PFMT alone. The volume of urine leakage per hour after the combined treatment was significantly lower than that of PFMT alone. The International Consultation on Insurance Questionnaire-Short Form (ICIQ-SF) scores from combining PFMT and Bojungikgi-tang were significantly lower than those for PFMT alone. Conclusion: This study suggests that Western medical treatment combined with Bojungikgi-tang for urinary incontinence from stress might be more effective in improving symptoms than conventional Western medical treatment alone. However, the number of studies included in the meta-analysis was insufficient, and the quality of the selected literature was generally low. Therefore, high-quality clinical studies on herbal medicine treatment for urinary incontinence would be required in the future.