• The Korean Journal of Health Service Management
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• v.9 no.4
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• pp.171-182
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• 2015

Objectives : The aim of this study was to identify the effect of employment type on health-related quality of life. Methods : This study used data from the Sixth Korea National Health and Nutrition Examination Survey. Data were analyzed with the ${\chi}^2$ test, t-test, ANOVA and multiple regression. Results : There were significant statistical differences the health-related quality of life according to employment type. The health-related quality of life of temporary workers was lower than that of regular workers. The significant predictors of the health-related quality of life of regular workers were the subjective health status, stress, age, and education. The significant predictors of the health-related quality of life of temporary workers were the subjective health status, education, stress, sleeping time, and gender. Conclusions : These results suggest that employment type affects the health-related quality of life. The research on social policy is recommended to resolve health inequalities.

• Journal of the Ergonomics Society of Korea
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• v.29 no.6
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• pp.897-905
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• 2010

The purpose of this study is to identify relationships between safety and health indices in a shipbuilding industry. From the results of periodical health examination, job stress test, and health questionnaire for musculoskeletal disorders, the author stratified the 704 shipbuilding workers into categories of smoking, drinking frequency, the amount of exercise per week, obesity, blood pressure, diabetic symptoms, liver function, audibility, job stress, fatigued condition, musculoskeletal symptom, and accident. The results show that occupational injuries are highly related to smoking, drinking frequency, auditory capacity, fatigued condition, and musculoskeletal symptoms. These results can be used to develop more effective accidental occupational injury prevention programs for shipbuilding industries.

• Journal of the Korean Society for Heat Treatment
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• v.6 no.3
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• pp.159-165
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• 1993

Creep tests of the TiC particulate reinforced Al composite have been conducted in the temperature ranges from 200 to $500^{\circ}C$. The steady-state cree rate of the composite depended strongly on the temperature and ap' plied stress. The stress exponent for the steady state creep rate of the composites was approximately 17.5 and the activation anergy was calculated to be 390KJ/mol. The steady-state creep equation could be written as $\acute{\varepsilon}_{ss}$ $$(s^{-1})=1.5{\times}10^{-9}\;{\sigma}^{17.5}\exp(-390000/RT)$$. Fracture surface examination showed that the fracture mode of the particulate reinforced composite was ductile by plastic tearing of the aluminum matrix and TiC particle interfaces were offered as sites for crack.

• Steel and Composite Structures
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• v.49 no.5
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• pp.503-516
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• 2023

In the current examination, a trigonometric shear deformation theory is hired to govern natural frequencies of a functionally graded porous microplate which is covered by two nanocomposite layers. The properties of the structure are varied based on the specified patterns. Utilizing the modified form of couple stress theory for taking the scale effect into account in conjunction with Hamilton's principle, the motion equations are obtained. Then, they are solved via Fourier series functions as an analytical approach. After confirming the results' accuracy, various parameters' effect on the results is investigated. Designing and manufacturing more efficient structures, especially those that are subjected to multi-physical loads can be accounted as findings of this work.

• Biomolecules & Therapeutics
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• v.32 no.4
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• pp.451-459
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• 2024

Apoptosis signal-regulating kinase 1 (ASK1) is an upstream signaling molecule in oxidative stress-induced responses. Because oxidative stress is involved in asthma pathogenesis, ASK1 gene deficiency was investigated in animal models of allergic asthma. However, there is no study to investigate whether ASK1 inhibitors could be applied for asthma to date. Selonsertib, a potent and selective ASK1 inhibitor, was applied to BALB/c mice of an ovalbumin (OVA)-induced allergic asthma model. Selonsertib suppressed antigen-induced degranulation of RBL-2H3 mast cells in a concentration-dependent manner. The administration of selonsertib both before OVA sensitization and OVA challenge significantly reduced airway hyperresponsiveness, and suppressed eosinophil numbers and inflammatory cytokine levels in the bronchoalveolar lavage fluid. Histopathologic examination elucidated less inflammatory responses and reduced mucin-producing cells around the peribronchial regions of the lungs. Selonsertib also suppressed the IgE levels in serum and the protein levels of IL-13 in the bronchoalveolar lavage fluid. These results suggest that selonsertib may ameliorate allergic asthma by suppressing immune responses and be applicable to allergic asthma.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.17 no.6
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• pp.70-80
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• 2016

This study was conducted to investigate the effects of an integrated recreation program on mood states, flexibility, and stress of elderly women. The integrated recreation program was applied to dance as a physical activity and songs and art as emotional activities in consideration of the characteristics of the elderly activities. The subjects were 50 elderly women aged 65 years or older who reside in K-do. The examination period was December 2 in 2014 to February 17 in 2015, during which time mood states, flexibilities, density of the salivary cortisol, variations in heartbeats, and stress were measured. The integrated recreation program had positive effects on mood, flexibility and stress reduction in elderly women. Based on these results, the integrated recreation program is considered to increase mood states and flexibility of elderly women while lowering stress. Therefore, the integrated recreation program developed in this study not only helps the physical and mental health of elderly women, but can also be widely utilized as a health promotion program for the elderly.

• Anxiety and mood
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• v.10 no.2
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• pp.170-175
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• 2014

Objective : The aims of this study was to evaluate relationship between body dissatisfaction, personality characteristic, and stress in young adults. Methods : One hundred and ninety five young, healthy, and normal participants filled out all 3 types of self-reported questionnaire, the Body Dysmorphic Disorder Examination-Self Report (Korean version of BDDE-SR ; K-BDDE-SR), Neuroticism, Extraversion, Openness-Five Factor Inventory (NEO-FFI) and Stress Scale of Korean version of the Depression Anxiety Stress Scale (K-DASS-21). Results : Out of the 195 participants, 30% (n=59) was male and 70% (n=136) was female. There was no statistical difference between high K-BDDE-SR group (K-BDDE-SR score 75 percentile or higher, n=50) and low K-BDDE-SR group (K-BDDE-SR score below than 75 percentile, n=145) in terms of weight, height, and BMI. In high K-BDDE-SR group, neuroticism was significantly higher than low K-BDDE-SR group, and extraversion, agreeableness, conscientiousness were significantly lower than low K-BDDE-SR group. Also, level of stress in high K-BDDE-SR group was significantly higher than low K-BDDE-SR group. Conclusion : Our study revealed that individual's with more body dissatisfaction were more neurotic and stressful. Thus, body dissatisfaction and diverse psychiatric diseases should be considered in treating neurotic and stressful young adults.

• Journal of Fashion Business
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• v.21 no.5
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• pp.43-60
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• 2017

The purpose of this study is to conduct an in-depth examination into the cause of stress as well as reasons for turnover relative to fashion industry workers in their 20s-30s, thereby seeking effective improvement methods to reduce turnover. The study method consisted of one-on-one in-depth interviews to collect data on 15 fashion industry workers. Results were as follow. First, causes of stress for fashion industry workers in their 20s-30s include work related factors, interpersonal relations, and organizational culture, while the most frequently mentioned reasons for turnover were concerns about career track and aptitude as well as annual salary, revealing that self-improvement related growth potential is the most significant factor for turnover. Second, it was not one stress factor that influenced turnover but a composite of several stress factors that motivated individuals to change jobs. Last, time flexibility, self-esteem, and development potential were critical factors for turnover. Self-esteem and development potential that provide a sense of acknowledgment were especially emphasized as the most significant, revealing that the younger generation considers personal happiness to be critical and the more this aspect is not treated adequately the more the odds of choosing turnover. To mitigate this issue, an in-house educational system for self-development and an assignment rotation system must be adopted for workers to change to positions that fit their aptitude.

• Toxicological Research
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• v.29 no.1
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• pp.61-67
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• 2013

Development of a therapy providing protection from, or reversing gentamicin-sulfate (GS)-induced oxidative stress and nephrotoxicity would be of great clinical significance. The present study was designed to investigate the protective effects of Houttuynia cordata Thunb. (HC) against gentamicin sulfate-induced renal damage in rats. Twenty-eight Sprague-Dawley rats were divided into 4 equal groups as follows: group 1, control; group 2, GS 100 mg/kg/d, intraperitoneal (i.p.) injection; group 3, GS 100 mg/kg/d, i.p. + HC 500 mg/kg/d, oral; and group 4, GS 100 mg/kg/d i.p. + HC 1000 mg/kg/d, oral administration). Treatments were administered once daily for 12 d. After 12 d, biochemical and histopathological analyses were conducted to evaluate oxidative stress and renal nephrotoxicity. Serum levels of creatinine, malondialdehyde (MDA), and blood urea nitrogen (BUN), together with renal levels of MDA, glutathione (GSH), superoxide dismutase (SOD), and catalase (CAT) were quantified to evaluate antioxidant activity. Animals treated with GS alone showed a significant increase in serum levels of creatinine, BUN, and MDA, with decreased renal levels of GSH, SOD, and CAT. Treatment of rats with HC showed significant improvement in renal function, presumably as a result of decreased biochemical indices and oxidative stress parameters associated with GS-induced nephrotoxicity. Histopathological examination of the rat kidneys confirmed these observations. Therefore, the novel natural antioxidant HC may protect against GSinduced nephrotoxicity and oxidative stress in rats.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.26 no.1C
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• pp.53-61
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• 2006

This study is aimed at to examine the stress redistribution mechanism for tunneling in an unconsolidated ground with inclined layers through model tests. To make the unconsolidated ground, two dimensional model ground is prepared with aluminum rods and blocks, which are frictional resistance free between testing apparatus walls and ground materials, by establishing the ground materials self-supporting. It is carried out to measure the ground deformation and the stress redistribution for model ground with tunneling by measuring apparatus respectively. For the ground deformation, surface settlements are measured to examine the deformation features during tunnel excavation. For the stress redistribution, the earth pressure acting on both the tunneling part and its surrounding parts is measured to examine their mutual relationship. Based on test results, precise examination is conducted on the stress redistribution mechanism in the unconsolidated ground with inclined layers during tunnel construction.