• Journal of Environmental Health Sciences
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• v.38 no.5
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• pp.431-437
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• 2012

Objectives: This study aims to investigate the effects of voice disorders on changes in stress among people with damaged larynxes. To accomplish this, physiological changes and reductions in the stress of Sprague-Dawley rats whose larynx had been damaged were investigated after the laboratory animals were administered kudzu leaf extracts with sedative effects. Methods: In the experiment, a total of 24 rats were divided into four groups of six rats, including the normal group, control group, experimental group 1, and experimental group 2. After orally administering to the subjects a predetermined amount of the extract at a specific time (once per day over five weeks), changes in physiological functions, internal organ weight, cortisol, estrogen, and progesterone in the subjects were examined, and an immunological test was conducted on their brain tissues. Results: Statistical significance was seen in the experimental group as opposed to the control group and the results were similar to those of the normal group. Conclusions: In consideration of these results, it is deemed that there are severe effects on stress due to voice disorders and that the administration of kudzu leaf extracts results in improvement in stress.

• Journal of Korean Academy of Nursing Administration
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• v.19 no.3
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• pp.372-381
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• 2013

Purpose: The purposes of this study were to analyze the mediating effects of empowerment, job stress, organizational commitment and relation-oriented nursing organization culture on turnover intention of clinical nurses. Methods: Participants selected for the final analysis were 382 nurses working in 4 general hospitals. Data were analyzed through descriptive statistics Pearson correlation analysis (SPSS/WIN 17.0), and Path analysis (AMOS 18.0). Results: The study results are as follows: relation-oriented nursing organizational culture had no direct effect but had an indirect effect on nurses' turnover intention through empowerment, job stress, and organizational commitment, while job stress and organizational commitment had direct effects on turnover intention. The results also showed that empowerment had strong effect on organizational commitment, but job stress had very weak effect. Empowerment had an effect on turnover intention. Conclusion: These results indicate that establishment of relation-oriented nursing organization culture is imperative if clinical nurses' turnover intention is to be decreased.

• Journal of Korean Clinical Health Science
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• v.11 no.1
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• pp.1607-1615
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• 2023

purpose: In addition to evaluating the quality of sleep of college students, the effect on non-face-to-face online learning satisfaction is identified and used as basic data for improving the quality of remote lectures. Methods: From June 1 to June 24, 2022, a self-entry survey was conducted on students enrolled in the dental hygiene department of D University in Daegu. To evaluate the non-face-to-face online learning satisfaction and sleep quality of the study subjects using the lBM SPSS Statistics 21 program, ANOVA analysis was conducted on the difference between individual stress levels and non-face-to-face online learning satisfaction. The correlation between sleep quality, stress, and non-face-to-face online learning satisfaction was analyzed using Pearson's correlation coefficient. Results: The lower the quality of sleep, the higher the stress, resulting in statistically significant results (p<0.001). The higher the quality of sleep, the higher the learning satisfaction, resulting in statistically significant results (p<0.001). There was a statistically significant positive correlation between learning satisfaction and stress (r=0.591, p<0.01). Conciussions: Through the above results, in order to improve the satisfaction of non-face-to-face online learning, it is necessary to manage the individual's learning environment and health to relieve stress. Instructors also need to communicate with learners and apply teaching methods considering learners' academic abilities.

• Journal of Korean society of Dental Hygiene
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• v.18 no.3
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• pp.399-410
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• 2018

Objectives: The purpose of this study was to examine the current status of the relationship between clinical practice stress, satisfaction and self-concept of dental hygiene department students in order to effectively implement the clinical practice, which is a necessary course for professional dental hygienists. Methods: The subjects in this study were 299 dental hygiene department students who participated in clinical practice. The survey was conducted from November 1, 2017 to December 31, using self-filling questionnaire (INJE 2017-08-004-002). Statistical analysis was conducted to identify the clinical practice characteristics, clinical practice stress, satisfaction and self-concept and the results according to clinical practice characteristics were compared through t-test and ANOVA. The regression analysis was conducted to identify the effects on self concept. Results: Clinical practice stress, satisfaction and self concept were identified to be significant(p<0.01). Multiple regression analysis results of the factors affecting self concept of study subjects showed that self concept was statistically significant in grade, education programs and satisfaction. Conclusions: Self-concept, clinical practice stress and satisfaction were significantly correlated. In order to raise the quality of clinical practice and to become a professional dental hygienist, it is necessary to continue research on the measures to improve the stress management and satisfaction in clinical practice for establishing self-concept.

• The Korean Journal of Health Service Management
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• v.11 no.2
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• pp.17-27
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• 2017

Objectives : The rapidly changing consumer-centric and customer-oriented nature of the medical environment results in significant cognitive load. We aimed to clarify the situation of emotional labor and job stress among hospital employees and seek policies and hospital management for employees' emotions. Methods : The study was conducted through a questionnaire about emotional labor and job stress among 554 individuals working in Seoul, in 9 national, public, and private hospitals. Results : The results of the emotional labor and job stress questionnaire showed statistically significant differences in surface behavior and job stress; both had higher values in employees from the private hospitals than employees from public hospitals. Conclusions : This study found that the stress of emotional labor is a serious problem in government medical institutions. In addition, these institutions need to provide internal customer satisfaction through the hospital ombudsman and harmonize work and healing programs by including plans for improvement.

• Transactions of the Korean Society of Mechanical Engineers A
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• v.41 no.1
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• pp.7-11
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• 2017

In this study, we develop the exact field of mode I in an infinitely deep crack in a half-plane. Using this field, we obtain the exact stress intensity factor $K_{I}$. From the tractions on the crack faces induced by exact field, we calculate the stress intensity factor of this field. We compare the results with the stress intensity factor calculated using Bueckner's weight function formula and that calculated by using Tada's formula listed in "The Stress Analysis of Cracks Handbook" It was found that Bueckner's formula yields accurate results. However, the results obtained using Tada's formula exhibit inaccurate behavior.

• International Journal of Automotive Technology
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• v.8 no.4
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• pp.483-491
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• 2007

A closed form solution of a composite mechanics system is performed for the investigation of elastic-plastic behavior in order to predict fiber stresses, fiber/matrix interfacial shear stresses, and matrix yielding behavior in short fiber reinforced metal matrix composites. The model is based on a theoretical development that considers the stress concentration between fiber ends and the propagation of matrix plasticity and is compared with the results of a conventional shear lag model as well as a modified shear lag model. For the region of matrix plasticity, slip mechanisms between the fiber and matrix which normally occur at the interface are taken into account for the derivation. Results of predicted stresses for the small-scale yielding as well as the large-scale yielding in the matrix are compared with other theories. The effects of fiber aspect ratio are also evaluated for the internal elastic-plastic stress field. It is found that the incorporation of strong fibers results in substantial improvements in composite strength relative to the fiber/matrix interfacial shear stresses, but can produce earlier matrix yielding because of intensified stress concentration effects. It is also found that the present model can be applied to investigate the stress transfer mechanism between the elastic fiber and the elastic-plastic matrix, such as in short fiber reinforced metal matrix composites.

• Korean Journal of Childcare and Education
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• v.16 no.3
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• pp.19-37
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• 2020

Objective: The purpose of this study was to examine how job stress, coping style, and social support were associated with quality of life among child care teachers. Methods: The participants were comprised of 281 child care teachers in the metropolitan area of Seoul. Job stress, problem-focused coping style, social support, and quality of life were assessed by a teacher-reported questionnaire. Results: Correlation and regression analyses revealed that while job stress predicted lower quality of life, having problem-focused coping style and family support enhanced quality of life among child care teachers. Furthermore, results showed significant moderation effects of support from directors at child care centers on the relationship between job stress and quality of life among child care teachers. Conclusion/Implications: The findings suggest the important role of problem-focused coping styles and family support in enhancing quality of life. Moreover, support from directors at child care centers appeared to buffer the effects of job stress on quality of life among child care teachers. Results were discussed in terms of their implications for educational and counseling programs for child care teachers.

• Transactions of the Korean Society of Mechanical Engineers A
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• v.33 no.1
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• pp.72-81
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• 2009

This paper provides simulational round robin test results for welding residual stress prediction of safety/relief nozzle. To quantify the welding variables and define the recommendation for prediction and determination of welding residual stress, 6 partners in 5 institutes participated in round robin test. It is concluded that compressive axial and hoop residual stress occurs in dissimilar metal weld and pre-existing residual stress distribution in dissimilar metal weld was affected by similar metal weld due to short length of safe end. Although the reason for the deviation among the results was not pursued further, the effect of several key elements of FE analyses on welding residual stress was investigated in this paper.

• Journal of the Korea Safety Management & Science
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• v.16 no.3
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• pp.35-44
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• 2014

This study empirically examines how much effect levels of fatigue and stress of a construction worker have on disaster risks from the perspective of human factors concerning construction disaster risks. To achieve the purpose of this study, a survey was conducted with respect to construction workers working at large construction sites within the metropolitan area. The retrieved survey data were analyzed by using the statistical software programs, SPSS 18.0 and AMOS 8.0. The results of this study do not definitively lead to the conclusion that the level of fatigue or stress of construction workers result in disaster risks. However, it does show that the results vary depending upon the individual approach and treatment of stress and fatigue. In particular, this study revealed that disaster risk levels could increase through unsafe behavior intentions which were established as a mediator variable. Also, with respect to unsafe behavior intentions of construction workers leading to disaster risks, when examining the results that the level of mental fatigue, occupational stress and social-psychological stress of construction workers had a greater significant effect than the level of physical fatigue, this study demonstrates the importance of psychological and mental issues that could be easily overlooked with respect manual labor workers.