• Laser Solutions
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• v.11 no.2
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• pp.1-7
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• 2008

The integrity of laser welded structures is decided in fracture strength and fatigue strength. This study made an effort to understand the fracture behavior considering residual stress. Experiments are conducted and analyses are performed to explore the influence of residual stress on fracture behavior of bead-on laser welded compact specimen. Fracture experiments are performed using ASTM 1820. The performed analyses included thermo-elasto-plastic analyses for residual stress and subsequent J-integral calculation. A modified J integral is calculated in the presence of residual stresses. The J-integral is path-independent for combination of residual stress field and stress due to mechanical loading. The results indicates that the tensile residual stress near crack front bring the low fracture load while the compressive residual stress bring the high fracture load compared to no residual stress specimen. These results quantitatively understand the influence of residual stress on fracture behavior.

• Journal of Korean society of Dental Hygiene
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• v.15 no.3
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• pp.389-397
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• 2015

Objectives: The purpose of the study is to examine the behaviors by the degree od dry mouth related to stress, dry mouth and halitosis. Methods: The subjects were 400 adults. A self-reported questionnaire was completed from August 1 to November 30, 2014. The data were analyzed using SPSS 18.0 program. The questionnaire consisted of eight questions of general characteristics of the subjects, one question of subjective stress symptom, six questions of dry mouth symptom, four questions of dry mouth behavior, and one question of halitosis. Results: There was a significant difference between halitosis and stress in patients having systemic diseases. Stress had a significant difference with gender, income, drinking frequency and alcohol consumption. The degree of dry mouth had a significant difference with gender and age. In dry mouth severity, behavior showed a significant difference with age, education, and times and amount of alcohol consumption. Age had a positive correlation with cigarette consumption and a negative correlation with dry mouth and dry mouth behavior. Cigarette consumption showed a positive correlation with alcohol consumption. Drinking frequency had a positive correlation with alcohol consumption, dry mouth, dry mouth behavior, halitosis and stress. Alcohol consumption had a positive correlation with dry mouth behavior, and dry mouth showed a positive correlation with dry mouth behavior, halitosis and stress. Dry mouth behavior had a positive correlation with halitosis and stress, while halitosis showed a positive correlation with stress. Conclusions: Stress, dry mouth and halitosis were closely correlated. Since stress is the most important variable, stress relief will be the most effective measure to alleviate oral symptoms. Therefore, stress relief measures need to be devised for oral health management in adults having stressful life.

• Journal of the Korea Safety Management & Science
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• v.24 no.1
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• pp.39-48
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• 2022

Considering that previous works on safety behavior relatively have not paid adequate attention to the influence of various leadership styles on safety behavior. The current paper investigates the impact of authentic leadership on safety behavior and its intermediating mechanisms. In specific, this paper delves into the mediating effect of job stress, as well as the moderating effect of perspective taking ability of employees in the association between authentic leadership and job stress. The results demonstrated that that authentic leadership has a negative (-) influence on job stress, which has a negative (-) influence on safety behavior. Moreover, job stress mediated the association between authentic leadership and safety behavior. Furthermore, perspective taking moderated the authentic leadership-safety behavior link.

• Korean Journal of Child Studies
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• v.17 no.1
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• pp.173-188
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• 1996

The purpose of this study was to examine the relation of stress and perceived social supports to problem behavior during childhood, with particular emphasis on the main and stress-buffering effects of perceived social supports. Such demographic data as parents' educational level, father's job, mother's employment, family income, and child's sex and age were also in chided in the study. Statistical techniques were ANOVA, t-test, and multiple regression. Major findings were that behavior problems of children increased with children's stress and decreased by perceived social supports. Perceived social supports moderated the relation between children's stress and problem behavior. Children's stress and perceived social supports differ by educational level of parents, father's job, and family income. Behavior problems of children were differed by family income, father's educational level and job. Children's stress and behavior problems differed by sex and age in some sub-domains, but perceived social supports did not differ by children's sex and age. Perceived social support from friends was the most influential factor affecting children's problem behavior. Therefore, friends may be considered the most important source of social support that is available for adjustment and for coping with stress during childhood.

• The Korean Journal of Community Living Science
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• v.23 no.1
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• pp.5-16
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• 2012

The purpose of this study was to examine the impact of parenting stress on children's problematic behavior in multicultural families. The subjects were 143 mothers who are caring for their 3-6 year old children in multicultural families. Data was collected using a parenting stress index and a child behavior check list. The data were statistically analyzed using a t-test, a one-way ANOVA(Scheff'e test), a correlation analysis and multiple regression analysis. The study showed that there were no significant differences in parenting stress according to the socio-demographic variables. However, there were some significant differences in children's problematic behavior according to the mother's education. Correlation analysis indicated that the mother's parenting stress and children's problematic behavior in multicultural families had significant positive correlations in all sub-variables. It was also found that the mother's education, the mother's stress caused by a difficult child, the mother's stress caused by dysfuntional interactions between parents and children and educational distress, were all significant predictors of the preschool children's problematic behavior in multicultural families.

• Journal of the Korean institute of surface engineering
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• v.26 no.2
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• pp.63-70
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• 1993

The mechanical properties of ferrite-martensited dual phases steels are affected by the microstructural factors, such as martensited volume fractions, ferrite grain size, strength ratio, connectivity, etc. Two phase alloys are technologically important. However, there is a lack of understanding as to stress-strain behavior of dual phase alloy in terms of stress-strain behavior of each component phases. The lack of the understanding stems from the complex deformation behavior of two phase alloys. The aim of this study is to rationalize stress-strain behavior of dual phase alloy in terms of the stress-strain behavior of component phase by systematically considering all the factors listed above. It was found that for a given martensite volume fraction, the calculated stress-strain curve was higher for a finer particles size than for a coarse particle sized within the range of the strains considered, and this behavior was seen for all the different volume fraction alloys considered. The calculated stress-strain curves were compared with corresponding experimental curves, and in general, good agreement was found. The maximum difference in flow stress between the calculated and the experimental results occurs at the nearly beginning of the plastic deformation.

• Journal of Families and Better Life
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• v.33 no.6
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• pp.1-14
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• 2015

The purpose of this study was to explore structural relationships among social support, parenting stress, self-perception and parenting behavior perceived by mother and provide preliminary data useful for desirable parenting behavior. For this purpose, the data of fourth wave Panel Study on Korean Children(PSKC) including social support, parenting stress, self-perception and parenting behavior measured by 1,746 mothers with 3-year-old children were analyzed. We identified structural relationships among the variables using SPSS 18.0 and AMOS 18.0 applying structural equation modeling. Measurement model and structure model had favorable goodness of fit and the results of structure models on each path were as follows. First, parenting behavior had positive correlations with social support and self-perception but there was a negative correlation between parenting behavior and parenting stress. Second, the relationship between social support and self-perception was mediated by parenting stress and parenting stress and self-perception mediated the relationship between social support and parenting relationship. In conclusion it is required to raise awareness about the importance of development of various parent education programs and parenting behavior.

• Korean Journal of Occupational Health Nursing
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• v.17 no.2
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• pp.180-190
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• 2008

Purpose: The present study was intended to assess stress, depression and fatigue of nurses working for university hospitals and to reveal its association with the type A behavior pattern. Method: The self-administered questionnaires were given to 810 nurses employed in 4 participating hospitals located in Daejeon City. The questionnaire items included sociodemographic, job-related, and the type A behavior patterns as independent variables and the PWI, SDS and MFS as dependent variables. Result: The proportion of the type A behavior pattern was 24.3% of subjects, in the degree of stress, high risk stress group was 87.0%, in the degree of depression, normal group was 60.9%, in the degree of fatigue, high risk fatigue group was 48.6%. The degree of stress, depression, and fatigue were significantly higher in the type A behavior pattern group then the type B behavior pattern group. The type A behavior pattern was significant positive correlation with stress, depression, and fatigue. The degree of stress(OR=1.2, 95%CI=1.167-1.262), depression(OR=1.1, 95%CI=1.11-1.17) and fatigue (OR=1.1, 95%CI=1.04-1.06) were significantly higher for the type A then the type B behavior pattern group. Conclusion: The degree of stress, depression, and fatigue were significantly higher in the type A then the type B behavior pattern group.

• Human Ecology Research
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• v.51 no.4
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• pp.403-412
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• 2013

The purpose of this study was to explore the general tendencies of maternal parenting stress, coping style, marital satisfaction and preschool children's withdrawal behavior as well as to investigate the effects of maternal parenting stress, coping style, and marital satisfaction on preschool children's withdrawal behavior. The participants involved 86 mothers of preschoolers and their teachers from one day care center and two kindergartens in Seoul and Gyeong-gi province. Maternal parenting stress, coping style and marital satisfaction were assessed by the mothers' self-reports, whereas the preschool children's withdrawal behavior was assessed by the teacher's report. The data were analyzed by using descriptive statistics, correlation analysis, t-test and multiple regressions. The collected data was analyzed by SPSS ver. 15.0. The major findings were summarized as follows: There were no differences between maternal parenting stress, coping style and marital satisfaction between mothers of boys and girls. Further, there were differences in preschool children's withdrawal behavior between boys and girls; girls showed more withdrawal behaviors than boys. Typical stress due to parenting, outsider's help coping style and marital satisfaction explained the withdrawal behavior of preschool children. As the level of typical stress increase in mothers, preschool children showed increased withdrawal behavior. Moreover, as mothers used fewer outsider's help coping style and had lower marital satisfaction, their preschool children's showed increased withdrawal behavior. In conclusion, maternal parenting stress, coping style and marital satisfaction significantly influence on preschool children's withdrawal behavior.

• Journal of Families and Better Life
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• v.11 no.2
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• pp.182-194
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• 1993

The purpose of this study was to investigate 1) the effect of family economic stress and parental support on behavior problems of children and 2) family economic stress parental support and behavior problems of children according to their sex and age. The subjects were 72 third grade children and 131 sixth grade children selected from five elementary school(105 male and 98 female) The questionaire was used as a methodological instrument and the statistics used for data analysis were frequency percentile mean ANOVA scheffe test t-test Results of this study indicated that behavior problems of children were increased by family economic stress and were decreased by parental support. The findings also indicated an indirect effect of family economic stress on behavior problems of children : increased stress was associa- ted with lower parental support and lower parental support was associated with higher behavior problems of children Boys were higher than girls in agression and delinquency and sixth grade children were higher than third grade children in obsession.