• Proceedings of the Korean Nuclear Society Conference
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• 1996.05a
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• pp.413-418
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• 1996

The main purpose of this paper is to develop the modified LTC code for accurate analysis of the boron concentration behavior of all components in the Nuclear Steam Supply System (NSSS). This is achieved by adapting a multi-cell mad to the existing Long Term Cooling (LTC) code. To verify the modified LTC, the simulated results were compared with the actual test results measured during YGN 4 initial criticality test. It was shown that the simulated results of this modified LTC were in good agreement with the actual test results. Also, the boron concentration behavior analysis were performed using the modified LTC code for both direct and indirect dilution/boration nude using YGN 3,4 design data. This modified LTC code can provide a valuable information in predicting boron concentration behavior during power maneuvering such as startup operation, shutdown operation and load follow operation. It is expected that the modified LTC can be applied to both on-line and off-line mode using Plant Computer System(PCS).

• Journal of Ocean Engineering and Technology
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• v.33 no.1
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• pp.85-91
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• 2019

In a cryogenic storage structure, the insulation system is in an environment in which fluid impact loads occur throughout the lifetime of the structure. In this study, we investigated the effect of repetitive impact loading on the mechanical performance of glass fiber-reinforced polyurethane foam. The repeated impact loading test was conducted in accordance with the required impact energy and the required number of repetitive impacts. The impact behavior of glass fiber-reinforced polyurethane foam was analyzed in terms of stress and displacement. After the impact test, the specimen was subjected to a compression test to evaluate its mechanical performance. We analyzed the critical impact energy that affected mechanical performance. For the impact conditions that were tested, the compressive strength and elastic modulus of the polyurethane foam can be degraded significantly.

• Journal of the Architectural Institute of Korea Structure & Construction
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• v.35 no.4
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• pp.147-155
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• 2019

In this study, flexural tests of granite reinforced with titanium metal rods were carried out to repair and restore the damaged stone-made cultural heritage, the Stone Pagoda of the Mireuksa Temple Site. A total of twelve specimens were tested. The primary test parameters are the reinforcement ratio and the location of the reinforcement. For restoration, epoxy resin was used for joining the separated stones, and titanium metal rods were used for structural reinforcement. Test results showed that the flexural failure took place in specimens with a reinforcement ratio of 0.8% or less, and shear failure occurred when the reinforcement ratio was 1.68% or more. The peak load of the reinforced stone was found to be highly related to the reinforcement ratio. The peak load increased with increasing the reinforcement ratio. Also, the flexural behaviors of the reinforced stones were affected by the location of the reinforcement. Based on the test results, this study recommends the reinforcement ratio of the reinforced granite to induce ductile behavior.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.29 no.5C
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• pp.183-190
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• 2009

It is necessary to predict the deformation and stresses on soils to establish the nonlinear stress-strain relationship of geomaterials at various strain levels. Especially, a need exists to establish the pre-failure nonlinear characteristic of cemented granular geomaterials used in road constructions. In this paper, therefore, conventional granular soils were mixed with various cementing materials, such as cement and fly ash from coal combustion by-products. Then, the normalized nonlinear behavior of cemented geomaterials was assessed using unconfined compression test. In addition, various constitutive models of soils were evaluated for estimating pre-failure non-linear behavior of cemented geomaterials from the test results.

• Elastomers and Composites
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• v.58 no.3
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• pp.103-111
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• 2023

The abrasion resistances of silica-filled styrene-butadiene rubber (SBR) compounds prepared with and without dicyclopentadiene resin (SBR-R and SBR-0, respectively) were studied using four different abrasion testers, namely cut and chip (CC), Lambourn, DIN, and laboratory abrasion tester (LAT100). The effect of the resin on the abrasion behavior was elucidated by analyzing the morphologies and size distributions of wear particles. All the wear particles had rough surfaces, but those obtained in the Lambourn abrasion test exhibited relatively smooth surfaces. The size distributions of the wear particles showed different trends depending on the abrasion tester and the rubber compound; however, most of the wear particles were larger than 1000 ㎛. The SBR-R sample showed a wide range of particle sizes (from 63 ㎛) in the LAT100 abrasion test and majority of the wear particles were 500-1000 ㎛, whereas the SBR-0 sample had the most distribution of larger than 1000 ㎛. The abrasion rates of SBR-0 sample were lower than those of the SBR-R sample for the CC and LAT100 abrasion tests, but the Lambourn abrasion test result showed the opposite trend. Addition of the resin influenced the abrasion behavior, however the effect varied depending on the type of abrasion tests.

• The Korean Journal of Community Living Science
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• v.19 no.1
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• pp.87-99
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• 2008

The purpose of this study was to examine the effects of child rearing behavior and child rearing involvement on elementary school children's stress. The subjects were 201 children selected from 2 elementary schools and their parents. Data was collected using the children's stress index, the child rearing behavior questionnaire, and the child rearing involvement questionnaire, and was statistically analyzed using t-test, one-way ANOVA (Duncan test), correlation analysis and multiple regression analysis. The study showed that there were some significant differences in children's stress according to the child's gender, grade, and scholastic achievement. Correlation analysis indicated that the child's stress and the mother's child rearing behavior had significant correlation, especially the warmth acceptance behavior of the mother indicated negative high correlation. Also, the child's stress and father's child rearing behavior had significant correlation, especially the rejection restriction behavior of the father indicated positive high correlation. Correlation analysis indicated that the child's stress and the mother's child rearing involvement had significant correlation, especially the family activities involvement of the mother indicated negative high correlation. As well, the child's stress and the father's child rearing involvement had significant correlation, especially the day to day guidance involvement of the father indicated negative high correlation. It was also found that rejection restriction behavior of the father, permissiveness non-intervention behavior of the father, day to day guidance involvement of the father, family activities involvement of the father, and warmth acceptance behavior of the mother were all significant predictors of the elementary school child's stress.

• The Research Journal of the Costume Culture
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• v.16 no.1
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• pp.33-47
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• 2008

The purposes of this study were to extract the effects of emotional labor, self-efficacy and burnout on customer-oriented selling behavior of salesperson by literature review and to examine the effect variables on customer-oriented selling behavior empirically. The questionnaire was administered to 400 salespersons who were selling clothes, cosmetics, shoes, leather products and accessories in department stores located in Kwang-ju city during August 18-24, 2006. Data collected from 307 salespersons were analyzed by using descriptive statistics, factor analysis, t-test, ANOVA, Duncan-test, correlation, regression analysis and path analysis. The results were as follows: First, Salesperson's emotional labor was composed of two factors; emotional labor toward the customer and emotional labor toward the organization. Second, Salesperson's emotional labor had negative significant influence on customer-oriented selling behavior. Specifically, the emotional labor toward the organization negatively influenced on customer-oriented selling behavior, but the emotional labor toward the customer positively influenced on customer-oriented selling behavior. Third, Salesperson's emotional labor positively influenced on burnout. Specifically, emotional labor toward organization significantly influenced on burnout, but emotional labor toward customer did not influenced on burnout. Fourth, Salesperson's self-efficacy positively influenced on customer-oriented selling behavior. Fifth. Salesperson's self-efficacy negatively influenced on burnout. Finally, Salesperson's burnout negatively influenced on comer-oriented selling behavior. The direct effect of salesperson's self-efficacy on customer-oriented selling behavior was large than the indirect effect of salesperson's self-efficacy mediate burnout. But the indirect effect of salesperson's emotional labor mediate burnout was large than the direct effect of salesperson's emotional labor on customer- oriented selling behavior.

• Journal of Families and Better Life
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• v.35 no.1
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• pp.31-44
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• 2017

The purpose of this study was to examine the relationship between toddler's negative emotionality, parenting behavior, and the moderating roles of mother's personality. The participants in this study consisted of 221 mothers of toddlers (aged from 18 to 35months) in Seoul. The participants completed questionnaires on toddler's negative emotionality, their personality and parenting behavior. The collected data were mainly analyzed by descriptive statistics, t-test, one-way ANOVA, Duncan test, Pearson's correlation and the multiple regression analysis. The main findings of this study were as follows. First, there was a significant difference in the negative parenting behavior according to the mother's educational level. Second, relations between individual variables and parenting behavior were analyzed. As a result, number of children, mother's age, toddler's negative emotionality, and mother's personality were significantly correlated with parenting behavior. Third, through the analysis of the moderating effect of the mother's personality on the relationship between the toddler's negative emotionality and parenting behavior, it was found that interactions between the mother's neuroticism and the toddlers' negative emotionality affected the mother's warm parenting behavior. And interactions between the mother's extraversion and the toddlers's negative emotionality affected the mother's rejection parenting behavior. The results of this study provide basic data to support mothers' positive parenting behavior.

• Journal of Korean Clinical Nursing Research
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• v.30 no.1
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• pp.24-34
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• 2024

Purpose: This study aimed to identify factors influencing nurses' intention to care for COVID-19 patients based on the theory of planned behavior, and to test the moderating effect of perceived behavior control between attitude, subjective norms, and nurses' intention to care. Methods: The participants were 167 nurses working at two designated hospitals for infectious diseases located in J and C city, South Korea. Data were collected from October 10th to 25th, 2020, and analyzed using independent t-test, ANOVA, and Pearson correlation coefficient, and hierarchical multiple regression analysis. The moderating effect was analyzed using the Process Macro model 1 (95% confidence interval, 10,000 bootstrapping), and a simple slope analysis was performed to identify the moderating effect of perceived behavior control. Results: The factors affecting nurses' intention to care for patients with COVID-19 were attitude toward the behavior (β=.32, p<.001) and perceived behavior control (β=.37, p<.001) in model 1, attitude toward the behavior (β=.28, p<.001) and perceived behavior control (β=.36, p<.001), and perspective taking (β=.26, p<.001) in model 2. The explanation power of this model was 65.0% (F=18.41, p<.001). The moderating effect of perceived behavioral control was statistically significant in the relationship between subjective norms and intention to care for patients with COVID-19 (F=16.37, p<.001). In the simple slope analysis, the reinforcement effect was greatest when the level of perceived behavioral control was at the mean (95% CI=0.46~0.67) and high (95% CI=0.70~1.08). Conclusion: Developing and applying a training program that enhances confidence and improves empathy is necessary to increase nurses' intention to care for COVID-19 patients.

• Journal of Digital Convergence
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• v.16 no.9
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• pp.197-206
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• 2018

This purpose of this study was to investigate self-esteem, body image and maternal fetal attachment behavior in pregnant women and to identify factors influencing maternal fetal attachment behavior. Data were collected 188 pregnant women. Data were analyzed using t-test, ANOVA, Scheffe's test, Pearson's correlation coefficient, Stepwise Regression Analysis. There were statistically significant difference in self-esteem on variables such as religion, income. There were statistically significant difference in body image on variables such as planned pregnancy. There were statistically significant difference in maternal fetal attachment behavior on variables such as religion, planned pregnancy. Self-esteem was positively correlated with body image. Maternal fetal attachment behavior was positively correlated with self-esteem and body image. Factors influencing maternal fetal attachment behavior were body image, religion, and planned pregnancy, which explained 15.6%. Findings provide useful information for further studies in maternal fetal attachment behavior of pregnant women. Therefore, to promote maternal fetal attachment behavior of pregnant women, it is necessary to standardized prenatal education program.