• Journal of the Korea Concrete Institute
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• v.14 no.3
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• pp.331-340
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• 2002

In this paper, finite element analysis is applied for simulation of cracks due to restraining autogenous and drying shrinkage at early-age concrete. A micro-level heat hydration model and a shrinkage prediction model along with a moisture diffusion model are adopted for the finite element analysis. Then, an axial restraint test is carried out for concrete specimens containing different amounts of chloride ions to evaluate stress development and cracking due to the restraining shrinkages at early ages. Test results show that the increase of contents of chloride ions increases restrained stress, but does not increase strength. By this increase of shrinkage strain at early-age, time to occur the crack is accelerated. Finally, stress development and cracking of concrete specimens containing different amount of chloride ions we simulated using the finite element analysis. Results of the analysis using the Proposed model are verified by comparison with test results.

• Journal of Nutrition and Health
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• v.33 no.5
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• pp.507-516
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• 2000

The purpose of this study was to investigate the effect of vitamin C and vitamin E supplementation on the iron contents and oxidative stress of the rats. Rats were fed 18g ascorbic acid and 300IU $\alpha$-tocopherol/kg diet, respectively. Rats were sacrificed at 1, 3, 5 and 7 month of age. The blood, liver and brain were selected for the quantitation of iron and malondialdehyde(MDA) contents, glutathione peroxidase(GSHPx), superoxided dismutase(SOD) and catalase(CAT) activity. Iron and MDA contents and GSHPx activities were increased with aging. Vitamin C and Vitamin E supplementation increased iron contents of the plasma. Vitamin C raised iron contents, but vitamin E decreased iron contents of the liver. In the brain vitamin C and vitamin E did not affect the iron level. MDA levels were decreased with vitamin C and vitamin E supplementation in the erythrocyte and liver, and vitamin C supplementation elevated MDA levels in the brain. GSHPx activity was increased with vitamin C and vitamin E supplementation. SOD activities of erythroucyte and brain were not affected with age, but in the liver, SOD activity was raised with age and vitamin C supplementation. Vitamin C and vitamin E supplementation promoted CAT activity of erythroucyte and liver, and CAT activity of brain was eleveated with vitamin addition but was decreaed with vitamin E addition. Vitamin C and vitamin E decreased iron contents of blood plasma, MDA contents of plasma and liver, and CAT activity of erythrocyte. Above results indicated that iron contents and biomarkers of oxidative stress were more affected by age than antioxidant action of vitamin C and vitamin E.

• Journal of Preventive Medicine and Public Health
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• v.56 no.5
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• pp.413-421
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• 2023

Objectives: This study explored the effect of the coronavirus disease 2019 (COVID-19) pandemic on psychosocial stress in prime working-age individuals in Korea, focusing on gender inequalities. We hypothesized that the impact of COVID-19 on mental health would differ by age and gender, with younger women potentially demonstrating heightened vulnerability relative to men. Methods: The study involved data from the Korea Community Health Survey and included 319 592 adults aged 30 years to 49 years. We employed log-binomial regression analysis, controlling for variables including age, education, employment status, marital status, and the presence of children. The study period included 3 phases: the period prior to the COVID-19 outbreak (pre-COVID-19), the early pandemic, and the period following the introduction of vaccinations (post-vaccination). Results: The findings indicated that women were at a heightened risk of psychosocial stress during the early pandemic (relative risk [RR], 1.01; 95% confidence interval [CI], 0.98 to 1.05) and post-vaccination period (RR, 1.07; 95% CI, 1.04 to 1.10) compared to men. This pattern was prominent in urban women aged 30-34 years (pre-COVID-19: RR, 1.06; 95% CI, 1.02 to 1.10; early pandemic: RR, 1.16; 95% CI, 1.08 to 1.25; post-vaccination period, RR, 1.22; 95% CI, 1.14 to 1.31). Conclusions: The COVID-19 pandemic has exerted unequal impacts on psychosocial stress among prime working-age individuals in Korea, with women, particularly those in urban areas, experiencing a heightened risk. The findings highlight the importance of addressing gender-specific needs and implementing appropriate interventions to mitigate the psychosocial consequences of the pandemic.

• Journal of Preventive Medicine and Public Health
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• v.29 no.3 s.54
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• pp.609-616
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• 1996

This study was conducted to evaluate the degree of stress state and the risk factors related to in 967 white collar workers and 275 blue collar workers by using Psycosocial Well-being Index. The results obtained were as follows : 1. In the white collar workers and blue collar workers, young age, low education and low income groups had high scores of stress, while in white collar workers, female had high scores of stress but in blue collar workers, male had high scores of stress. 2. According to psychosocial well-being index, mild stress sto were 73.9% and 53.1%, high risk stress state were 8.9% and 44.4%, and healthy state were 17.2% and 2.6% in white collar and blue collar workers respectively. 3. The total stress score was highly associated with the factors of depression, social performance and self-confidence, general well-being and vitality, and sleeping disturbance and anxiety in order. 4. In reliability test of stress factors, Cronbach's $\alpha$ coefficients of depression, social performance and self-confidence, general well-being and vitality, and sleeping disturbance and anxiety were 0.89, 0.81, 0.79, and 0.74 respectively. In conclusion, it suggested that age, sex, marital status, income, education, sleeping time, smoking and exercise habit were associated with stress score, all of the above factors should considered to occupational health.

• Journal of Korean Academic Society of Home Health Care Nursing
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• v.10 no.1
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• pp.34-40
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• 2003

Purpose: The purpose of this study was to investigate the job stress in home care nurses. Method: The subjects were 139 home care nurses of hospital in an urban cities. The data were collected from 26 Man to 27 June by self report adherence questionnaire. Job stress was measured using CHN-PWRSQ(Community Health Nurses Perceptions of Work-Related Stressors Questionnaire). Result: The average score of job stress was 60.8. There were significantly high levels of job stress in those who have less than 10 years office period, those who have less than 2000000 won monthly salary than in their counterparts. With regard to the level of job stress by item, 'driving long distance and traffic jam', 'risk of traffic accident', 'bad weather condition', 'uncooperative family members', and 'uncooperative client/patient' were higher than other items. The age and office period were negatively correlated with job stress. Conclusion: The average score of job stress was 60.8. 'driving long distance and traffic jam', 'risk of traffic accident', 'bad weather condition', 'uncooperative family members', and 'uncooperative client/patient' were higher than other items. The age and office period were negatively correlated with job stress.

• Journal of International Academy of Physical Therapy Research
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• v.5 no.2
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• pp.723-729
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• 2014

The purpose of this study is to understand the relationship between female college students' stress level and premenstrual syndrome so that it can provide baseline data on how to cope with the syndrome. The study subjects are 250 female college students in Gyungbook area. This study chose 199 appropriate subjects and collected data. As per general menstrual phases, this study investigated the age when one had her first period, regularity and duration of period, and amount of bleeding. It used a measurement tool to measure stress level and premenstrual syndrome. Most of the subjects experienced their first period before the age of 13. The menstrual period was irregular with the duration of less than 7 days. 123 subjects had normal amount of bleeding. 121 subjects were experiencing high level of stress over 2.4. The correlation between the level of stress and premenstrual syndrome factors showed significant static correlation for each factor. Especially, the correlation between digestive system and response of autonomic nervous system was .996 and negative emotion and behavioral change was .635, and negative emotion and pain was .614 which were relatively high. The regression analysis of factors of premenstrual syndrome depending on the subjects' stress level indicated that response of autonomic nervous system had the biggest effect in the low stress group while behavioral change, negative emotion, pain, decreased concentration, water congestion, response of autonomic nervous system, and skin change had the biggest effect in the high stress group with statistical significance. Based on the result, it can be said that higher premenstrual stress is closely related to the premenstrual syndrome one experiences for some female college students.

• Journal of Environmental Health Sciences
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• v.30 no.3
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• pp.272-282
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• 2004

Stress is a primary health promotion issue in worksite research because psychological distress is closely related not only to workers　 health status but also to their job performance. This study identified the work environment and work condition factors affecting workers　 stress symptoms among the Korean manufacturing factory workers. A total of 7,818 factory workers employed in 1,562 manufacturing companies participated in the Korean nation-wide occupational health survey conducted by the Korean Occupational Safety and Health Agency in 2003. Participants were selected by the stratified proportional sampling process by standardized industry classification, company size, and locations. Trained interviewers visited the target companies and interviewed the factory workers randomly selected in each company. Work environments included physical work environments (temperature, noise, hazardous organic compounds, and so on) and psychological work environments (job demands, job control, and social support at work), and work conditions included daily working hour, rest time, and so on. Men were 71.5% and the mean age was 34.0 years old. The average working period in the present company was 6.9 years. The average stress score was 26.2 under the perfect score, 50, which means the moderate level of stress. Perceived stress had significant correlations with young age, poor physical work environment, high fatigue, bad perceived health status, and high job demands in Pearson's simple correlation analysis. Perceived health status and perceived fatigue explained 21% variance of stress symptoms and the work environment factor explained 4.8% of that; however, work condition did not have the sufficient effect. In particular, psychosocial work environment variables (job demand, job control, and social support at work) had a clear effect on stress symptoms rather than the physical work environments. Poor perceived health status, severe perceived fatigue, poor physical work environment, high job demands, low social support, heavy alcohol consumption and little exercise were significantly related to high stress symptoms in the Korean manufacturing workers.

• The Korean Journal of Community Living Science
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• v.16 no.2
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• pp.75-91
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• 2005

The purpose of this study was to examine the relationship between parenting stress, social support and the social development of preschool children in rural areas. The subject included 114 preschool children, along with their mothers, selected from kindergartens and day care centers in rural areas. The instruments included the parenting stress index, social support inventory and the social maturity scale. The statistics used from this data were t-test, one-way ANOYA(Scheffe test), correlation analysis and multiple regression analysis. This study showed that maternal parenting stress was influenced significantly by the related variables; gender of child, birth order of child, age of mother, educational attainment of mother, family income, religion, family type. And also, social support was influenced significantly by the above variables. The child's social development was influenced significantly by the variables that related child and the family. Correlation analysis indicated that parenting stress and social development of the child were relatively negative high correlation coefficients. And social support and social development of the child were relatively positive high correlation coefficients. The important factors on predicting social development of the child were found to be birth order of child, age of mother, educational attainment of mother, family income, religion, family type, daily stress, stress of difficult child, stress of parent-child dysfunctional interaction, educational distress, husband support, and other support. Especially stress of difficult child and husband support were important variables that predicted the social development of the preschool children.

• The Journal of Korean Society for School & Community Health Education
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• v.15 no.1
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• pp.89-103
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• 2014

Objectives: The purpose of the study was to clarify the relationship between parenting, job related stress and child care using data from working mother's in Korea and Japan. Methods: In this study, we conducted a survey of 125 Korean mothers who used childcare facilities in two cities and 170 Japan mothers who used childcare facilities in two cities. The questionnaire sought information about the mother's age, age of the youngest child, family composition, mother's occupation, parenting stress, job stress, appropriate parenting behavior and child maltreatment. Based on this survey data, it was tried to reveal the effective paths between parenting stress, job stress, appropriate parenting behavior and child maltreatment in order to provide the rationale for intervention by using SEM. Results: Child care was statistically significantly affected by parenting stress and job stress for both Korean and Japanese working mother's. Conclusions: The results of the research suggest the need to establish work-life balance policies to improve the balanced lives of working mother's.

• Journal of muscle and joint health
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• v.20 no.2
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• pp.81-90
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• 2013

Purpose: The purpose of this study was to identify factors contributing to health-related quality of life in patients under rehabilitation after stroke. Methods: A descriptive correlational study design was used. Ninety-two stroke patients under rehabilitation from a university hospital were included. Data were collected on March and April, 2013 using structured questionnaires. Hierarchial multiple regression analysis was used to identify factors influencing health-related quality of life. Results: There were significant differences in health-related quality of life according to type of impairment. The health-related quality of life had significant correlations with age, functional dependency, and stress. Factors influencing health-related quality of life for stroke patients under rehabilitation were stress, functional dependency, type of impairment, and age, which explained about 34.5% of total variance. Conclusion: To promote health-related quality of life for stroke patients under rehabilitation, stress and functional dependency should be managed in this population, especially for older adults. Also these results can be utilized in the development of program for helping rehabilitation of stroke patients. The effect of depression and anxiety on health-related quality of life should also be addressed in future research.