• 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.

• Korean journal of food and cookery science
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• v.22 no.6 s.96
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• pp.783-791
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• 2006

The consciousness and eating habits of the housekeeper directly influence the stress level and health quality of the household occupants. In Korea, most housewives are in charge of dietary life. Accordingly, their attitudinal clusters toward dietary (eating) life were researched in relation to their stress and health. The research results showed that irregular eating habits cause stress. Therefore, it is necessary for housewives to have a regular eating habit. The results were as follows. The house wives' attitudes toward dietary life were categorized into 5 clusters: regular and speedy overeating, regular and frequent eating, regular and light eating, irregular and light eating, irregular and speedy overeating. The cluster of regular and frequent snacks was 24.3%. The cluster of irregular and speedy overeating caused the most stress. Especially the house wives' group belonging to the cluster of irregular and speedy overeating were under social and emotional stress, while the cluster of regular and light eating and the cluster of irregular and light eating were under concentration stress. The cluster of regular and frequent snacks and the cluster of irregular and light eating had negative effect on their health, while the cluster of regular and speedy overeating had negative effect on their family's health by their social stress.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.18 no.1
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• pp.388-394
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• 2017

The purpose of this study was to determine the mediating effects of stress associated with university life and the stress response of university students' resilience towards the negative emotions of health department students. As a research method, 284 students in the health department of Gyeongsangnamdo were surveyed. Data were analyzed in terms of frequency, correlation and regression using SPSS 22.0 program. The results of the study were as follows. The mean score of resilience towards negative emotions among students in the health department was 4.49, while stress associated with university life was 2.74. As a result of the correlation analysis among resilience towards negative emotion, stress response and stress associated with university life, the negative emotion was found to have a negative correlation with the stress associated with university life and the stress response. Resilience towards negative emotions was found to reduce the stress associated with university life by mitigating the stress response. Therefore, in this study, resilience appears to affect the stress associated with university life and the students' response to it. Therefore, for students in the health department who are exposed to stress associated with university life, the resilience towards negative emotions may be a way of alleviating the stress response.

• Journal of Korea Entertainment Industry Association
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• v.14 no.3
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• pp.353-361
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• 2020

The purpose of this study was to examine the relationship between the life stress and stress coping of occupational therapy students in an effort to provide directions and various methods to ensure the psychological stability and successful university adjustment of students. The subjects in this study were 369 students majoring in occupational therapy in universities located in Jeolla Province. A self-administered survey was conducted from June 1 to July 30, 2019. The findings of the study were as follows: As for life stress by general characteristics, there were differences in that regard according to gender, academic year, Family relations and economic status. For stress coping, there was a difference in that regard according to gender. Life stress had a significant positive relationship with stress coping, and specifically, it had significant positive relationships with emotion-focused coping and wishful thinking, subfactors of stress coping. The subfactors of life stress had a significant negative correlation with those of stress coping as well. In conclusion, it is necessary to develop and research the effectiveness of stress coping programs to reduce life stress during college life and facilitate the school adjustment of college students.

• The Korean Journal of Emergency Medical Services
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• v.23 no.3
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• pp.97-110
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• 2019

Purpose: This study aimed to investigate the role of life stress in the relation between health behaviors and bioethics awareness among paramedic students. Methods: This study recruited 238 paramedic students in F and R areas as participants. Multiple regression analysis was performed using Baron and Kenny's three-step procedure. Results: In the first stage, health behaviors had a significant effect on life stress (β=-.202, p<.01). In the second stage, health behaviors had a significant effect on bioethics awareness (β=.240, p<.001). In the third stage, life stress had a significant influence on bioethics awareness (β=-.167, p<.01). In the fourth stage, the regression coefficient of the third stage (β=.137) was less than that of the second stage (β=.159). In addition, when controlling for life stress, health behavior was shown to affect bioethics awareness (β=.206, p<.01). The mediating effect of life stress was found to be significant in the relation between health behavior and bioethics awareness (Z=2.04, p<.05). Conclusion: As health behavior is a factor that affects bioethics awareness through the mediation of living stress, universities should prepare training programs to improve the health behavior and reduce the life stress among students.

• Journal of Agricultural Extension & Community Development
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• v.30 no.2
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• pp.69-82
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• 2023

This study aims to examine the moderating effects of work hours between job stress and quality of life of young farmers. A survey was conducted on 618 young farmers for one month from July 1, 2022. The main analysis results are as follows. First, quality of life and job stress, quality of life and work hours had a negative correlation, and job stress and work hours had a positive correlation. Second, work hours were found to have a moderating effect on the relationship between job stress and quality of life. Third, as a result of identifying the area of significance of work hours, it was found that work hours played a role in moderating the relationship between quality of life and job stress when work hours were longer than 1.327 hours. Fourth, as a result of visualizing the moderating effect by dividing work hours into three groups: high, medium, and low, it was found that even if the level of job stress was the same, the farmers with long work hours perceived their quality of life to be worse than those with shorter work hours. It can be said that in order for young farmers to settle down and live stably in agriculture and rural areas as professionals, it is very important to actively develop and support policies to improve the working environment in the agricultural sector that can secure time to enjoy culture and leisure and relieve job stress.

• Proceedings of the Korea Committee for Ocean Resources and Engineering Conference
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• 2002.05a
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• pp.125-129
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• 2002

Authors had developed the model for the fatigue life assessment of welded details considering residual stress and its relaxation. The model consists of three ingredients; a hot-spot stress approach, a residual stress relaxation, and an equivalent stress. The equivalent stress is induced by stress ranges and the ratios between the applied mean stresses and the ultimate stress of material. Once being tuned with two specific fatigue tests by using load carrying cruciform joint, this model can be applied to many kinds of welded details which structural stress concentration factors are different from each other. This paper reports the application of the proposed model for various welded details including cover plate, longitudinal stiffener, gusset and side attachment. From the investigation of predicted results by using the proposed model it was shown that the ambiguous fatigue characteristics of the various details influenced widely by the welding residual stress are clarified, and also the model could be applied to assess fatigue life of general welded structures.

• Journal of Plant Biotechnology
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• v.4 no.2
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• pp.53-58
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• 2002

Adverse environmental conditions such as drought, high salt and cold/freezing are major factors that reduces crop productivity worldwide. According to a survey, 50-80% of the maximum potential yield is lost by these "environmental or abiotic stresses", which is approximately ten times higher than the loss by biotic stresses. Thus, improving stress-tolerance of crop plants is an important way to improve agricultural productivity, In order to develop such stress-tolerant crop plants, we set out to identify key stress signaling components that can be used to develop commercially viable crop varieties with enhanced stress tolerance. Our primary focus so far has been on the identification of transcription factors that regulate stress responsive gene expression, especially those involved in ABA-mediated stress response. Be sessile, plants have the unique capability to adapt themselves to the abiotic stresses. This adaptive capability is largely dependent on the plant hormone abscisic acid (ABA), whose level increases under various stress conditions, triggering adaptive response. Central to the response is ABA-regulated gene expression, which ultimately leads to physiological changes at the whole plant level. Thus, once identified, it would be possible to enhance stress tolerance of crop plants by manipulating the expression of the factors that mediate ABA-dependent stress response. Here, we present our work on the isolation and functional characterization of the transcription factors.n factors.

• Asian Oncology Nursing
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• v.10 no.2
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• pp.129-136
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• 2010

Purpose: This study was conducted to examine the relationship between stress and quality of life of family caregivers of patients with lung cancer. Methods: From April 18 to May 4, 2009, data were collected using self-report questionnaires with 95 family caregivers of lung cancer patients in G cancer center. The data were analyzed using descriptive statistics, t-test, ANOVA and pearson's correlation coefficient with SPSS 14.0. Results: The mean score of the stress level was 27.5 (SD=14.77). The mean score of the QOL was 73.0 (SD=17.86). The stress level of family caregiver showed significant difference according to gender (psychological stress p=.011, total level of stress p=.042) and availableness of second caregiver (physical stress p=.023, psychological stress p=.035, total level of stress p=.001). The QOL of family caregivers showed significant difference according to daily caring (positive adaptation p=.045) and financial burden on treatment expense (positive adaptation p=.004, total quality of life p=.043). The negative correlation was found between stress and QOL of family caregivers (r=-.67, p=.032). Conclusion: These results indicate a need to develop nursing intervention programs for family caregivers to reduce stress and improve QOL.

• Proceedings of the KSME Conference
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• 2004.04a
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• pp.348-352
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• 2004

Recently the steel parts used for automiles and trains are required to be used under higher stress than ever before in need of the weight down. However, threr are a lot of problems with developing such of fatigue strength and fatigue life are mainly focused on by adopting residual stress. And got the following characteristics from crack growth test carried out stress ratio. Fatigue life shows more improvement in the Un-peening material. And Compressive residual stress of surface on the Shot-peening processed operate resistance force of fatigue. So we cam obtain fallowings. (1) The fatigue crack growth rate on stage II is conspicuous with the size of compressive residual stress and is dependent of Paris equation. (2) Although the maximum compressive residual stress is deeply and widely formed from surface, fatigue life does not improve than when maximum compressive residual stress is formed in surface. (3) The threshold stress intensity factor range is increased with increasing compressive residual stress.