• Korean Journal of Psychosomatic Medicine
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• v.7 no.1
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• pp.61-71
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• 1999

Objective : The purpose of this study was to assess the relationship between the premenstrual changes and stress perception in women with premenstrual changes($PMC^+$)(n=32) and those without premenstrual changes($PMC^-$)(n=62) by using prospective method. Method : The women who were older than 30 years of age and healthy were asked to complete a daily rating form based on DSM-IV diagnostic criteria for one menstrual cycle to assess the changes of psychological and physical symptoms across the menstrual cycle. They also completed 5-point likert scale to assess the perception of stress. Percent changes method was used to assess changes between follicular phase and luteal phase. Results : 1) No significant differences were found in demographic factors(age, education, marriage, employment) and risk factors(onset ages of menarche, regularities of premenstrual changes, duration of menstruation, cycle length, amount of menstruation, dysmenorrhea) between women with and without premenstrual changes. 2) There was a significant difference in mean luteal phase stress score between women with($1.92\pm0.63$) and without premenstrual changes($1.51\pm0.42$)(p<0.05). However no difference was found in mean follicular phase stress score between two groups($PMC^+$ : $1.67\pm0.43$, $PMC^-$ : $1.33\pm0.39$). 3) We divided women having premenstrual changes into two groups, higher stress group(stress score > 1.75(median)) and the lower stress group(stress score <1.75(median)). The higher stress group reported more luteal psychological symptoms than did the lower stress group(df=1, F=13.362, p<0.001). However, the groups did not differ in physical symptoms. Conclusion : In women with premenstrual changes, luteal stress score was higher than follicular stress score and this result suggested tha the perception of stress was related to psychological symptoms but not physical symptoms. These findings suggested that premenstrual change is associated with the stress level, and that it is important to manage the stress which is focused on the management of psychological symptom in the treamtment of prementrual syndrome.

• Korean journal of food and cookery science
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• v.16 no.1
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• pp.84-90
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• 2000

This study was to investigate the eating attitutes, food habits, perceived stress of high school students. Three hundred and fifty four high school students in Seoul area were surveyed to obtain the information from Sep. 18 to 26 in 1997. The average height and weight of high school students were 173.7 cm, 62.9 kg for male students and 162.5 cm, 52.6 kg for female students. The 52.5% of high school students were normal weight and 41.5% of them were underweight. Female students(46.7%) showed higher proportion of underweight than male students(37.0%). The students(50.9%) ate breakfast irregularly and most students(92.5%) ate Korean food for breakfast. The dietary changes of high school students over past few years showed that the intake of vegetable, fruit and yogurt were increased. The food habit score showed no significant difference by gender, mother's employment and monthly spending money. The nutritional knowledge score of female students were higher than the score of male students. Most high school students(93.9%) were highly stressed in their living. The stress score(3.35) of female students were higher than those of male students(3.15). However, excercise, eating slowly and good appetite could lower their perceived stress.

• Asia-pacific Journal of Multimedia Services Convergent with Art, Humanities, and Sociology
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• v.8 no.4
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• pp.517-531
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• 2018

This study was carried out for the purpose of investigating Uzbekistan students's adaptation to Korea college life. Qualitative interviews were conducted in regards to the motivation for college entrance and stresses incurred during college life for 10 Uzbekistan students who were studying at I college located in Incheon. Data from the interviews were analyzed using theme analysis method. Most of the participants in this study got information about Korean colleges through their overseas study exhibitions in their own countries and became Korea college. The results showed that the reasons for college enrollment were (1)preparation for future goals (2)the influence of family. In Uzbekistan, parents play a big role in determining their children's education. Therefore, their decision to study abroad and the role of their parents were significant. The stress they experienced in college life fell into five categories, namely, (1)financial stress (2)stress about studies (3) stress in regards to human relationships (4)stress in regards to their futures and getting a job. In addition, this study discussed how to solve such as problems experienced by Uzbekistan students. And also the role of college and the necessity of providing appropriate support programs were discussed. Finally, the implications of these findings were presented.

• Journal of Family Resource Management and Policy Review
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• v.10 no.2
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• pp.87-105
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• 2006

The goal of this study is to analyze the complicated and diverse nature of the relationship between work and family life for the study paper instructors of whom are married women. The survey data for these analyses were from an in depth interview which was conducted with the 21 contingent female workers as study samples. They are the married women, who started to work or returned to work after an absence to raise a family. The results showed that in reality the contingent female worker faced worse working conditions than the full time female labour force, even if women were determined to be a study paper instructor to meet work and family demand. It was the contingent women worker with a short time work experience who were in the worst position tlo adjust their working arrangements to suit their family needs and were confronted with the greater inter-role friction as a vulnerable group. The study revealed that instrumental and emotional support of husband has a positive effect on maintaining job role and lessening role conflicts and stress of the women. The work/family relationship indicated its double side, conflict and support. The women simply could not afford to depend on the psychological support form family in the midst of the inferior employment conditions and the absence of social support. This strategy, however, was based on the family ideology and the patriarchal gender division of labor. It caused the overload, stress and poor health of women involving some risk to give up the work.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.18 no.1
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• pp.715-723
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• 2017

This study investigates the properties of a high-performance cementitious composite with partial substitution of stone dust for fine aggregate. The relationship between the properties and particle size distribution was analyzed using several analytical models. Experiments were carried out to examine the flowability, rheology, and strength of cement mortars with different stone-dust replacement ratios of 0-30 wt.%. The results showed improved flowability, lower rheological parameters (yield stress and plastic viscosity), and improved strength as the amount of stone dust increased. These results are closely related to the packing density of the solid particles in the mortar. The effect was therefore estimated by introducing an optimum particle size distribution (PSD) model for maximum packing density. The PSD with a higher amount of stone dust was closer to the optimum PSD, and the optimization was quantified using RMSE. The improvement in the PSD by the stone dust was proven to affect the flowability, strength, and plastic viscosity based on several relevant analytical models. The reduction in yield stress is related to the increase of the average particle diameter when using stone dust.

• Journal of Preventive Medicine and Public Health
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• v.42 no.5
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• pp.323-330
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• 2009

Objectives : The aim of this study was to investigate whether working married women in different occupational classes affected diverse health outcomes. Methods : We used data for married women aged 25-59 (N=2,273) from the 2005 National Health and Nutritional Examination Survey. Outcome measures included physical/mental and subjective/objective indicators (selfrated poor health, chronic diseases, depression, and suicidal ideation from reported results; metabolic syndrome dyslipidemia from health examination results). Agestandardized prevalence and logistic regression were employed to assess health status according to three types working groups (housewives, married women in manual jobs, married women in non-manual jobs). Sociodemographic factors (age, numbers of children under 7, education, household income) and health behaviors (health examination, sleep, rest, exercise, smoking, drinking) and a psychological factor (stress) were considered as covariates. Results : Non-manual married female workers in Korea showed better health status in all five health outcomes than housewives. The positive health effect for the non-manual group persisted in absolute (age-adjusted prevalence) and relative (odds ratio) measures, but multivariate analyses showed an insignificant association of the non-manual group with dyslipidemia. Manual female workers showed significantly higher age-adjusted prevalence of almost all health outcomes than housewives except chronic disease, but the associations disappeared after further adjustment for covariates regarding sleep, rest, and stress. Conclusions : Our results suggest that examining the health impact of work on married women requires the consideration of occupational class.

• Journal of Microbiology and Biotechnology
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• v.19 no.1
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• pp.72-77
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• 2009

Here, we demonstrate that the overexpression of the GroELS chaperone system, which assists the folding of intracellular proteins and prevents aggregation of its biological targets, can enhance the thermotolerance of Escherichia coli strains and facilitate the production of recombinant protein under thermal stress. The overexpression of GroELS led to an about 2-fold higher growth rate of E. coli XL-1 blue than control at $45^{\circ}C$ and induced the growth of the strain even at $50^{\circ}C$, although the growth was not sustained in the second-round culture. The effect of GroELS overexpression was also effective on other E. coli strains such as JM109, $DH5{\alpha}$, and BL21. Finally, we have shown that coexpression of GroELS allows us to produce recombinant protein even at $50^{\circ}C$, a temperature at which the protein production based on E. coli is not efficient. This study indicates that the employment of the GroELS overexpression system can expand the range of environmental conditions for E. coli.

• Journal of Korean Academy of Nursing Administration
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• v.16 no.1
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• pp.26-36
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• 2010

Purpose: The purpose of this study was to investigate the relationships among psycho-social well-being, and health perception and behavior in clinical nurses. Methods: The data were collected from 362 nurses employed at five general hospitals. A self-reported questionnaire was used to assess demographics and job characteristics, health perception and behavior, depression, and psycho-social stress. The data were analysed using Cronbach's alpha, descriptive statistics, t-test, and ANOVA. Results: While nurses perceived themselves to be in good health, represented by a high mean for health perceptions, actual health behavior was poor as the mean for health behavior was low. Forty two percents of the subjects were categorized as having major depression and high-stress levels. There were statistically significant differences in psycho-social well-being according to age, marital status, years of employment, and monthly salary. Also, there were significant differences in psycho-social well-being according to health perception, regular meals and exercise, sufficient sleep, job related injury and accident, and absences for ill. Conclusion: In order to prevent depression and improve psycho-social well-being among clinical nurses, organizational support and health management needs to be focused on high-risk nurses. Furthermore, it is essential to consider the health perception and behavior of clinical nurses.

• Safety and Health at Work
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• v.9 no.3
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• pp.334-338
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• 2018

Background: With global changes in the current state of work and employment, the role of health-adverse psychosocial work environments has received increasing attention in developed as well as in rapidly developing countries. Thus, there is a need to apply valid measurement tools for monitoring and preventive purposes. This study aims to examine the factorial structure and psychometric properties of the Persian version of the effort-reward imbalance (ERI) questionnaire, assessing one of the internationally leading concepts of stressful work. Methods: This descriptive cross-sectional study of a random sample of 202 white collar employees in an industrial company in Iran analyzes the ERI scales by exploratory and confirmatory factor analysis. Moreover, aspects of construct and criterion validity are tested. To this end, correlations of ERI scales with subscales of organizational injustice, a complementary work stress model, and also the correlations of ERI scales with a questionnaire assessing psychosomatic symptoms are performed. Results: Internal consistency of the three ERI scales was satisfactoryy (Cronbach ${\alpha}$ effort: 0.76, reward: 0.79, overcommitment: 0.75). Fit indices of confirmatory factor analsis pointed to an adequate representation of the theoretical construct (e.g., adjusted goodness of fit index (AGFI): 0.73, goodness of fit index (GFI): 0.78). Negative correlations with subscales of organizational injustice supported the notion of construct validity of the ERI scales, and positive correlations of ERI scales with psychosomatic symptoms indicated preliminary criterion validity. Conclusion: The Persian version of the ERI questionnaire has acceptable psychometric properties and can be used as a valid instrument in research on this topic.

• Journal of Korean Society of Occupational and Environmental Hygiene
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• v.22 no.2
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• pp.107-118
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• 2012

Objectives: This study examines the occurrence of disease resulting from low back pain and factors of working environment meaningfully influencing the occurrence of lumbago as well as analyzes '2nd Korean Working Condition Survey (KWCS)' conducted in 2010 so as to establish the prevention and improvement measures. Methods: The analysis method is that it is to compare the prevalence rate of low back pain according to working environment via odds ratio and to implement the test about the factors having the difference in working environment between low back pain group and normal group through weighted t-test. Results: As a result, it indicates that there is a meaningful difference for prevalence rate of low back pain according to age, status in employment and education level which are socio-demographical factors. The analysis in working hours shows that the period of work is a factor raising the prevalence rate of low back pain rather than weekly working hours. The analysis in the work risk factor indicates that the increase in prevalence rate of low back pain takes place to either workers with repetitive movement and continuously standing posture or those with heavy stress and emotional labour. Conclusions: Workers with low back pain have suffered from accident, depression, anxiety disorder and sleep. The factors in which the prevalence rate of low back pain decrease are to provide information on health and safety and working speed, and enough rest.