• Journal of Environmental Health Sciences
• /
• v.46 no.3
• /
• pp.245-255
• /
• 2020

Objective: The present study analyzed domestic and overseas academic journals to understand the research status and characteristics of radon concentration distribution in Korea in accordance with environmental conditions. Methods: As part of the meta-analysis, pooled average concentration was calculated using an inverse variance-weighted average of the arithmetic means and standard deviations among the investigated values. Using the obtained pooled average concentration, a Monte-Carlo simulation was performed to increase the reliability of the occurrence possibility of the calculated concentration distribution. A total of 38 research articles were selected, including 27 articles published in domestic academic journals and 11 articles published in foreign academic journals. Results: The comparison results showed differences in radon concentration distribution in accordance with regional and topographical characteristics. Conclusion: Currently, even though research into radon is steadily picking up the pace in Korea much remains to be done. Additional research is thus needed to establish a baseline for radon emissions in Korea.

• The Korean Journal of Health Service Management
• /
• v.11 no.2
• /
• pp.43-53
• /
• 2017

Objectives : This study aimed to investigate the effects of resonant leadership and structural empowerment on the job satisfaction of registered nurses working in hospitals. Methods : Data were surveyed from 307 nurses in three general hospitals in Seoul and Gyeonggi-do using self-administered questionnaires from March 15 to 31, 2016. We conducted t-test, ANOVA, Pearson's correlation analysis, and multiple regression analysis using SPSS 21.0 for analysis. Results : Resonant leadership and structural empowerment had significant effect on the job satisfaction of nurses. These two attributes of a quality work environment explained 45.3% and 40.1% of the variance in organizational and opportunity satisfaction while controlling for age, marital status, religion, education, work department, work type, career and work position. Conclusions : The findings of this study suggest that resonant leaders and structural empowerments contribute to nurse job satisfaction. Therefore, developing resonant leadership skills and structural empowerment among nurse leaders in hospitals will ensure the creation of healthy work environments that promote job satisfaction and retention of nurses.

• KOREAN JOURNAL OF CROP SCIENCE
• /
• v.60 no.3
• /
• pp.349-354
• /
• 2015

The AMMI (additive main effects and multiplicative interaction) and GGE (genotype main effect and genotype by environment interaction) biplot which were accounted for a substantial part of total sum of square in the analysis of variance suggested to be more appropriate models for explaining G $\times$ E interaction. The grain yield of total ten sesame genotypes was significantly affected by environment which explained 61% of total variation, whereas genotype and genotype x environment interaction (G $\times$ E) were explained 16%, 24% respectively. From the results of experiment, three genotypes Miryang49, Koppoom and Ansan were unstable, whereas other three genotypes Kyeongbuk18, Miryang50 and Kanghuk which were shorter projections to AEA ordinate were relatively stable over the environments. Yangbak which was closeness to the mean yield and short projection of the genotype marker lines was regarded as genotype indicating good performance with stability. Ansan, Miryang48 and Yangbaek showed the best performance in the environments of Naju, Suwon, Iksan and Andong. Similarly, genotype Miyrang47 exhibited the best performance in the environments of Chuncheon and Miryang. Andong is the closest to the ideal environment, and therefore, is the most desirable among eight environments.

• Geotechnical Engineering
• /
• v.4 no.3
• /
• pp.19-26
• /
• 1988

A stochastic numerical model for predictions of differential settlement of foundation Eoils is developed in this Paper. The differential settlement is highly dependent on the spatial variability of elastic modulus of soil. The Kriging method is used to account for the spatial variability of the elastic modulus. This technique provides the best linear unbiased estimator of a parameter and its minimum variance from a limited number of measured data. The stochastic finite element method, employing the first-order second-moment analysis for computations of error Propagation, is used to obtain the means, ariances, and covariances of nodal displacements. Finally, a reliability model of differential settlement is proposed by using the results of the stochastic FEM analysis. It is found that maximum differential settlement occurs when the distance between two foundations is approximately same It with the scale of fluctuation in horizontal direction, and the probability that differential settlement exceeds the allot.able vague might be significant.

• The Journal of Industrial Distribution & Business
• /
• v.10 no.12
• /
• pp.25-34
• /
• 2019

Purpose - In this study, we would like to analyze how the general characteristics of retired senior citizens affect directly the satisfaction of retirees' lives. As the life cycle continues to grow longer, post-retirement environment is recognized as important, and this study is conducted to analysis the factors that concerns which parts influence future retirement life. Research design, data, and methodology - First, Pearson's correlation analysis was conducted to analyze the correlation between the satisfaction of retirement life and the characteristics of the elderly. Secondly, a one-way analysis of variance was conducted to find out the difference in the satisfaction level of post-retirement life depending on the characteristics of the elderly. Results - First, the demographic factors for the satisfaction of retirement life have shown a definite difference. Second, the family factors for the satisfaction of retirement life have shown a clear difference. Third, financial factors for the satisfaction of retirement life have shown a clear difference. Conclusions - Early retirement, especially in major jobs, is the basis for incomplete retirement preparation, which is a factor in unstable later life. If a prospective retiree can retire in a predictable retirement age, it would be sufficient to prepare for retirement in various areas, or to prepare for further directions.

• Journal of Distribution Science
• /
• v.18 no.9
• /
• pp.55-65
• /
• 2020

Purpose: The research aims to examine whether perception about busyness can affect the way people view themselves and then make an impact on purchase decision-making. Based on a proposed theoretical framework, the current research examines whether or not perception about busyness affects perceived self-worth and has an impact on impulsive buying. Research design, data, and methodology: The paper conducted a survey in which two scenarios are used for manipulating degree of busy mindset. For analyzing data, analysis of variance and regression analysis are applied, in conjunction with analysis of moderating effects. Results: Busy mindset has a positive effect on perceived self-worth. The effect of busy mindset on perceived self-worth is greater in the group of high perceived social mobility. In the category of hedonic products, perceived self-worth has a positive effect on impulsive buying intention. Conclusions: These results imply that a sense of self-worth can affect impulsive buying behavior on the basis that people sometimes buy things on impulse as a way of self-indulgence or self-reward for their efforts. Managerial implications of the results suggest a busy appeal to consumers would be more effective for hedonic products.

• Research in Community and Public Health Nursing
• /
• v.27 no.4
• /
• pp.399-409
• /
• 2016

Purpose: The purpose of this study was to analyze factors influencing health-related quality of life (HRQoL) among male adults. Methods: Participants were 196 male adults who were recruited from June to July 2016. Seven variables related to HRQoL including age, perceived stress, physical activities, problem drinking, social support, self-esteem, depression were measured. Data were analyzed using the SPSS/WIN 20.0 program and Amos 18.0 for descriptive statistics, Pearson correlation coefficients and path analysis. Results: The mean for HRQoL was 80.14. The path analysis showed that depression had the greatest direct effect on HRQoL. It was found that perceived stress had direct and total effects on HRQoL. It also mediated the paths of social support and self-esteem to HRQoL. These factors account for 68% of the total variance, and the fit indices of the model satisfied the criteria of fitness. Conclusion: The results indicate that these factors influencing HRQoL should be considered when developing programs to improve HRQoL for male adults.

• Women's Health Nursing
• /
• v.24 no.3
• /
• pp.297-309
• /
• 2018

Purpose: To develop Pregnancy Risk symptom Perception Scale (PRPS) and evaluate its validity and reliability. Methods: A preliminary 30-item version of PRPS was developed through literature review, in-depth interview, and Content Validity. Each item was scored on a four-point Likert scale. The preliminary scale was developed based on 301 pregnant women who visited a hospital. Date were analyzed using item analysis, factor analysis, confirmatory factor analysis, Pearson's correlation coefficients, and Cronbach's ${\alpha}$ (0.90 for total item, 0.80 to 0.88 for factors). Results: The PRPS consisted of 27 items. Three factors (physical, environmental, and emotional factors) explained 55% of the total variance. Cronbach's Criterion validity was supported by comparison with the Perception of Pregnancy Risk Questionnaire (r=0.34). In reliability test, the reliability coefficient of pregnancy risk symptom perception was high at 0.90. Conclusion: These results suggest that the pregnancy risk symptom perception scale developed in this study comprises items that can assess the level of pregnant women's pregnancy risk symptom perception in Korea. Its validity and reliability were proven. PRPS can be utilized to measure pregnant women's risk symptom perception during pregnancy. PRPS will contribute to the development of systematic prenatal care and effective risk management.

• Journal of the Semiconductor & Display Technology
• /
• v.13 no.3
• /
• pp.7-11
• /
• 2014

The experimental analysis presented aims at the selection of the most optimal machining parameter combination for wire electrical discharge machining (WEDM) of STD11. Based on the Taguchi experimental design ($L_{27}$ orthogonal array) method, a series of experiments were performed by considering time-on, voltage, time-off, wire speed, and flow rate as input parameters. The surface roughness was considered responses. Based on the signal-to-noise (S/N) ratio, the influence of the input parameters on the responses was determined. The optimal machining parameters setting for the minimum surface roughness was found using Taguchi methodology. In order to investigate the effects of process parameters on the surface machined by WEDM, Several experiments are conducted to consider effects of time-on, voltage, time-off, wire speed and flow rate on the surface roughness. Analysis of variance (ANOVA) as well as regression analysis are performed on experimental data. The best results of surface roughness were obtained at higher voltage, lower wire speed, and lower time-on.

• Journal of dental hygiene science
• /
• v.10 no.5
• /
• pp.335-340
• /
• 2010

This study was performed to evaluate the fracture strength of the dental zirconia veneering ceramics for zirconia ceramic core. Six commercial zirconia veneering ceramics were used in this study, namely E-Max(Ivoclar vivadent, Inc, Liechtenstein), Creation ZI(KLEMA Dental produckte GmbH, Austria), Cercon ceram kiss(Degudent, GmbH, Hanau-Wolfgang, Germany), Triceram(Dentaurum, Ispringen, Germany), Zirkonzahn(Zirkonzahn GmbH, Italy), Zirmax(Alpadent, korea). All samples were prepared according to the relevant instructions of manufacture. Disc specimens were prepared to the final dimensions of 17 mm in diameter and 1.5 mm in thickness. The biaxial flexure strength test was conducted using a ball-on-three-ball method. All specimens were tested in a moisture-free environment. Average flexural strengths were analyzed with Weibull analysis and one-way analysis of variance(ANOVA). Significant differences were founded between the mean flexural strength values of five commercials zirconia veneering ceramics and the other. The flexural strengths and Weibull modulus were similar to those of five groups E-Max(EM), Creation ZI(CR), Cercon ceram kiss(CE), Triceram(TR), Zirkonzahn(ZI) with the exception of Zirmax(ZM). The biaxial flexural strength from Cercon ceram kiss(CE) was higher than those of other groups. Fracture analysis showed similar results for these five groups.