• Environmental Engineering Research
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• v.24 no.1
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• pp.45-53
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• 2019

Water and soil properties in paddy fields subjected to organic and conventional farming were characterized over the rice cycle in South Korea. To achieve the goals of this study, we sampled and analyzed soil and water from 24 organic paddy plots and 11 conventional paddy plots in March, May, August, and October 2016. The results were analyzed using statistical analyses, including analysis of variance (ANOVA), cluster analysis, and principal component analysis. The ANOVA results showed that water content (WC), electrical conductivity (EC), organic matter (OM), and available phosphorus ($P_2O_5$) in soil varied significantly (p < 0.01) depending on the farming method. Higher OM, EC, and $P_2O_5$ of soil were observed in the conventional paddies than in the organic paddies. All soil properties, except pH and ammonium, depended on seasonal variation. Cluster analysis revealed that soil properties in May were distinctly separated from those in other seasons mainly due to basal fertilization. The principal component analysis distinguished the soil properties in different seasons, but such a distinction was not observed between the soil properties in organic and conventional paddies. Low contents of WC, OM, and total N were observed in March. High concentrations of nitrate and total P were observed in May, but these were low in August and October. The soils from October were also characterized by high concentrations of EC and $P_2O_5$. These results indicate that the sampling time for soil and water can significantly influence the evaluation of soil properties with different farming methods.

• Journal of Family Resource Management and Policy Review
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• v.18 no.3
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• pp.79-101
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• 2014

The main objective of this study is to explain the differences in intergenerational resource transfers among the middle-aged at various income levels. Analyses of data on financial resource transfers from the 2nd wave of the Korean Retirement and Income Study were conducted. The study sample consisted of 931 middle-aged individuals who had at least one living parent and one child. The data analysis methods were ${\chi}^2$ analysis, one-way analysis of variance(ANOVA), logistic regression analysis, and multiple regression analysis. Financial resource transfers are statistically significant factors explaining the preparation for later life and life satisfaction of middle-aged individuals. The empirical results reveal that the frequency of intergenerational financial transfers was significantly higher in high-income households than in middle- and low- income households. A comparison of high-, middle- and low-income households shows that financial resource transfers had a greater influence on the preparation for later life and life satisfaction of the middle-aged in middle-income households than in low- or high-income households. The level of life satisfaction was dependent upon to whom middle-aged individuals gave financial resources. In the middle-income group, the middle-aged who gave financial resources to their parents were more likely to have higher life satisfaction than those who did not. Receiving financial transfers from parents or children did not have a statistically significant impact on the life satisfaction of the middle-aged in any income-level group.

• Fashion & Textile Research Journal
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• v.10 no.5
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• pp.644-651
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• 2008

The health of foot is connected with individual's health and affects men's activity. In order to develope comfort socks, both foot size and foot shape must be considered. The purpose of this study was to categorize men's foot shape according to age using men's foot scan data (with 2005 Size Korea). Factor analysis, Cluster analysis, ANOVA, and Duncan's test were performed for statistical analysis of the data by SPSS Win 12.00 program. The results are as follows. 1. Nine factors constituting the men's foot were extracted through factor analysis and those factors comprised 77.7% of total variance. 2. On the basis of the cluster analysis, four different foot shapes were categorized. Cluster 1 was characterized by large in toe and ankle size. Cluster 2 was characterized by short foot length, low foot height, and small foot breadth/girth. Cluster 3 was characterized by large and high in foot height. Cluster 4 was characterized by short in foot length and large in foot breadth/girth. 3. Distribution of four foot shape clusters from 20 to 70 years in age above were categorized. For the 20 to 29 years in age, cluster 2, while for the over 30 years in age cluster 4 or cluster 3 is the most dominant foot type. A foot breadth in the 50 years over is wider size range than that in the below 49 years. The foot figures of elderly men over 60 years were smaller than those of below 60 years.

• The Journal of Korean Academy of Prosthodontics
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• v.45 no.5
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• pp.653-664
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• 2007

Statement of problem: The screw detorque value is a measure of the preload remaining in the screw just before detorquing. Purpose: This study evaluated the effect of different screw tightening sequences and tightening methods on detorque values for a well-fitting implant superstructure. Material and method: An implant superstructure that connected directly to four implants (Astra Tech) was fabricated on a fully edentulous mandibular acrylic resin model. Six well-fitting dental stone casts were made with a pickup impression of the superstructure from the acrylic resin model. To evaluate the effect of three screw tightening sequences (1-2-3-4, 2-4-3-1, and 2-3-1-4) and two tightening methods (2-step and 1-step) on the stability of screw joint, the detorque values for a well-fitting implant superstructure were measured twice after screw tightening using 20 Ncm. Detorque values were analyzed using multi-way analysis of variance and two-way analysis of variance at a .05 level of significance. Results: 1. The mean detorque values for three screw tightening sequences were 12.3 Ncm, 12.6 Ncm, and 12.0 Ncm, respectively. 2. The mean detorque values for two screw tightening methods were 12.0 Ncm, and 12.2 Ncm, respectively. 3. The mean of mimimum detorque values for three screw tightening sequences and for two tightening methods were 10.6 Ncm, 11.1 Ncm, 10.5 Ncm, and 9.8 Ncm, respectively. 4. No statistically significant differences among the variables of screw tightening sequence and tightening method were found (p>.05) for detorque values and for mimimum detorque values. Conclusion: Within the limitations of this study, the screw tightening sequence and tightening method did not have a significant effect on the detorque values for a well-fitting implant superstructure.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.15 no.12
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• pp.6998-7004
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• 2014

This study examined how the facility satisfaction, anxiety, self-esteem, stress, and depression of the elderly in care facilities affect their life satisfaction. The objects of the study were 271 elderly in 8 care facilities located in Seoul and associated areas. The results of a questionnaire, which was carried out from the 10th March to 25th August 2013, were analyzed. For data analysis, a t-test, one-way variance analysis, correlation analysis, and proof analysis on the SPSSWIN 18.0 program was conducted at the significance level of 5%. The analysis revealed the following. First, there were differences in the life satisfaction depending on age, sex, education level, and marital status. Second, life satisfaction was related to service satisfaction, medical service satisfaction, facility environment satisfaction, and self-esteem. Third, life satisfaction was higher if self-esteem, service satisfaction and facility environment satisfaction were higher, and if the family relationship stress was lower. Overall, self-esteem, service satisfaction, and facility environment satisfaction of the admitted elderly were positive influential factors of life satisfaction.

• Journal of Korean Society for Quality Management
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• v.43 no.3
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• pp.289-298
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• 2015

Purpose: This study examined the problem of crack formation in the fire control system(FCS) of the K11 objective individual combat weapon(OCIW), using design of experiment analysis. Three hypothesis were considered. The first hypothesis is that bolted joint has an effect on impulse caused by firing the weapon and the second hypothesis is that a short time interval of shooting has an effect on impulse and lastly, the third hypothesis is that a positive correlation has between the bolted joint of the FCS and the impulse. Methods: The relationship between the bolted joint and the impulse cause by firing the weapon were examined experimentally. The first and second hypothesis was tested using correlation analysis and the t-test. Results: Using ANOVA, the first null hypothesis was rejected and the alternative hypothesis was accepted. ANONA confirmed the second null hypothesis. Correlation analysis dismissed the last null hypothesis. A positive correlation between the bolted joint and the impulse caused by shooting the weapon was verified. Conclusion: The bolted joint of the K11 FCS and the barrel of the K11 affect the impulse caused by firing the weapon. A positive correlation was established between the bolted joint of the FCS and the impulse on firing the K11 OICW.

• The Journal of Korea Institute of Information, Electronics, and Communication Technology
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• v.8 no.2
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• pp.169-177
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• 2015

In this study, we investigate the effect on self-esteem in accordance with job satisfaction and psychological exhaustion of the kindergarten teachers. The data were collected through a survey aimed at 168 kindergarten teachers located in ${\bigcirc}$ gu, ulsan city from September 10, 2014 to October 17. Analysis methodologies using the program SPSSWIN 21.0 and Amos 21.0 were carried out. empirical analysis is verified at the significance level of 5% by t-test, one-way analysis of variance, correlation analysis, confirmatory factor analysis, structural equation. Results are as follows. First, the relationship between job satisfaction and self-esteem can be seen that there is no correlation. Second, the relationship between self-esteem and psychological exhaustion hat there is a correlation with each other. This study found out a direction to maximize the qualitative effects of Childhood Education. Also this study was considered to be the basic data to improve the working environment of kindergarten teachers and to provide a educational direction of early childhood teacher.

• The Research Journal of the Costume Culture
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• v.27 no.5
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• pp.461-478
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• 2019

As the concept of "marriage age" gradually disappears, the consumption class of the wedding market includes not only X and Y generations but also Z generations, and each generation has its own characteristics as it is already known, and there are differences in the consumption. So this research analyzed age-related behavior differences in both awareness of and preparation for marriage. Three hundred sixteen unmarried Korean males and females comprised the study population and data was collected from March 5, 2019, to April 3, 2019. The SPSS Statistics 23.0 Package was used for analysis, specifically the functions of frequency, cross tabulation, factor analysis, chi-squared test, Cronbach's alpha, Duncans's new multiple range test (MRT), and analysis of variance (ANOVA). Marriage motivation was analyzed by three factors, and there were significant differences in two types. Marital involvement was analyzed by two factors, and both factors showed significant age-related differences. Concerns relating to marriage preparation were analyzed by four factors, and two varied according to respondent age. Regarding marriage preparation behaviors, the analysis revealed that the marriage preparation method appreciably differed between age groups. Our analysis also found significant age-related differences in "the main media usually used to acquire information" and "the paths preferred for acquiring information in preparing for marriage". We expect that study results will be useful for identifying new research directions, understanding the dimensions of the wedding industry, and developing related marketing strategies.

• Journal of Korean Society of Environmental Engineers
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• v.39 no.10
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• pp.568-574
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• 2017

The purpose of this study was to optimize experimental conditions (time ($X_1$) (ranging of 26.36 - 93.64 min), concentration of sulfuric acid ($X_2$) (ranging of 0-2.5%) and temperature ($X_3$) (ranging of $136.4-203.6^{\circ}C$) for an organosolv pretreatment process to extract lignin from waste wood. The resulting quadratic model equation using RSM (response surface methodology) represented y (lignin yield) = $-79.89+0.91X_1+9.8X_2-2.54{\times}10^{-3}X_1{^2}-2.11X_2{^2}$. The $R^2$ (coefficient of determination) value of 0.8531 for a model indicates this model has statistically significant predictors at the 10% levels. The predictive results optimized by quadratic model produced a lignin yield of 12.46 g/100 g of dry wood under conditions of $178.2^{\circ}C$ and 2.32% $H_2SO_4$. The lignin yield was more affected by the acid catalyst concentrations than the reaction temperature, but the reaction time was not an influential factor for improving lignin extraction from waste wood in this organosolv pretreatment. According to ANOVA (analysis of variance), the significance probability (p-value) of model was smaller than 0.001 and simulation of obtained model equations showed a good reproducibility based on actual organosolv tests under optimal conditions.

• Culinary science and hospitality research
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• v.16 no.4
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• pp.124-138
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• 2010

This study aims to investigate the effect of hotel and restaurant employees' eating habits on their dining-out behavior. 309 workers from die hotel and restaurant companies participated in the survey, and SPSS 14.0 was used to perform frequency analyses, factor analyses, f-tests, ANOVA and multiple regression analyses. An exploratory factor analysis revealed three eating habits; unhealthy, healthy and ideal eating habits with 62.250% of the cumulative variance explained. The factor analysis included the priority on menu items, atmosphere and location of a restaurant with 60.658% of the total variance explained The results of the t-tests gave partial supports for the hypothesized gender difference in eating habits and for the hypothesis that eating habits would differ according to marital status. The result of ANOVA gave a partial support for die hypothesized age difference in eating habits. The result of the multiple regression analysis showed that all eating habits, unhealthy($\beta$=0.326, p<0.000), healthy($\beta$=0.290, p<0.000) and ideal($\beta$=0.305, p<0.000), had a significant effect on the priority on menu items. Eating habits explained 13.1% of die total variance in the importance of restaurant atmosphere and location. The influence of unhealthy eating habits was not statistically significant ($\beta$=0.002, p<0.965) while the influence of healthy($\beta$=0.309, p<0.000) and ideal eating habits($\beta$=0.189, p<0.000) was statistically significant Consequently, there was a partial support for the hypothesis that eating habits would influence die priority of restaurant atmosphere and location as a factor when dining out.