• Journal of the Korean Recycled Construction Resources Institute
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• v.9 no.4
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• pp.451-459
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• 2021

The purpose of this study is to evaluate the performance of a solidifying agent for recycling the fine powder separated from the nuclear power plant decommissioned concrete as a solidifying agent(SA) for radioactive waste. In order to evaluate the performance of the solidifying agent, a powder simulating the fine powder of waste concrete separated from the dismantled concrete of a nuclear power plant was produced, and the main variables were the type of binder and the replacement ratio of zeolite. The solidifying agent was evaluated for fluidity performance, compressive strength, and leaching resistance to non-radioactive cesium. The compressive strength of SA increased as the zeolite replacement ratio increased, and the SA containing 5% or more of zeolite showed a compressive strength that was 1.4 to 1.7 times higher than the acceptance criteria. The cesium leaching index of all specimens was 6 or higher, satisfying the acceptance criteria, and the leaching index of SA was 1.47~1.63 times higher than that of OPC. In particular, the average leaching index after 28 days of the 5% zeolite-substituted solidifying agent was 9.15, which was improved by about 6.4% compared to OPC, and it was confirmed that the zeolite was effective in improving the leaching resistance to cesium ions by showing stable performance over the entire period.

• Journal of the Health Care and Life Science
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• v.9 no.1
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• pp.161-167
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• 2021

The present study was conducted to assess the association between serum ferritin and 25-hydroxyvitamin D [25(OH)D] and metabolic syndrome (MetS) in Korean women. The data of a total of 9,256 adults (4,196 premenopausal women and 4,340 postmenopausal women) aged ≥ 20 years from the Fifth Korean National Health and Nutrition Examination Survey (KNHANES V) (2010-2012) were analyzed. The key study results were as follows: First, in women without MetS, after adjusting for related variables (age, smoking, alcohol consumption, regular exercise, SBP, DBP, WM, TC, TGs, HDL-C, FPG, Hb, Hct, and Fe), vitamin D status was positively associated with serum ferritin levels (premenopausal, p < 0.001; postmenopausal, p = 0.027). Second, in women with MetS, after adjusting for related variables, vitamin D status was not associated with serum ferritin levels (premenopausal, p = 0.739; postmenopausal, p = 0.278). In conclusions, vitamin D status was positively associated with serum ferritin levels in women without MetS but not in women with MetS.

• Land and Housing Review
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• v.12 no.2
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• pp.13-32
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• 2021

Rapid urbanization has resulted in the unprecedented growth of population in Metro Manila, the Philippines and has led to a 'dual' housing crisis - vacant/unoccupied socialized housing and a chronic housing shortage or delayed housing supply. By developing two GIS-based statistical models, this study is to examine socialized housing in comparison with private housing with respect to location patterns, integration, accessibility, social and economic aspects, and vulnerability to environmental hazards. Multiple regression analysis was integrated with the GIS to identify significant variables that influence the spatial distribution of socialized housing. The comparison between the two regression models has shown that socialized housing is located in areas with inappropriate land use and poor accessibility to transportation facilities and built urban resources. Moreover, both regression models have proven the statistical significance of the vulnerability of socialized housing to environmental hazards. The finding explains how the current housing policies do not address the country's housing crisis, especially for the marginalized and low-income households. Thus, the findings provide implications for urban planners and local decision-makers in reforming the current policy interventions.

• Korea Real Estate Review
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• v.28 no.4
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• pp.63-73
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• 2018

The purpose of this study is to identify the key factors affecting official land values and the appropriateness of the assessed land price, to find out what determines the real estate price and to assess the appropriateness of the valuation. This study explored whether actual transaction prices of forest land located in six Gu districts in southern and northern parts of Han river are appropriate using independent sample t-analysis and logistic regression analysis. Results showed that regional differences and shape were adequate for development restriction areas, whether biotope was designated, whether or not to be preserved, differences in pitch, and differences in use, and differences in bearing and approach. Thorough analysis of unique factors that determine forest land prices must be carried out in advance and the findings should be applied to the examination and assessment of official land values. The forest land appraisal system is closely related to the public's economic activity, thus it is necessary to apply forest land value determinants considered to be significant by market participants to the forestland appraisal system. I look forward to seeing variables related to the appropriateness of forest land transactions drawn from this study being used as indices for settlement of forest land transaction orders and market stabilization.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.19 no.11
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• pp.711-720
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• 2018

The purpose of this study was to explore the impact of lifelong educators' core competencies as a mediating effect on adult learners' ability to function. The subject of this study was aimed at adult learners participating in lifelong education programs at lifelong educational institutions located in Gyeonggi Province. and was finally used for a total of 520 additional analyses. The main findings of this study are as follows: first, regarding the correlation between the core competence of lifelong educators and the life ability of adult learners, core competence has a static association with wisdom. In addition, wisdom has a high static association with life expectancy. Second, the core competence and wisdom of lifelong educators were found to have a significant static impact on adult learners' life abilities, accounting for 66.8%. Specifically, the most significant predictors of life's ability were creative problem solving, consideration for others, and acceptance of change, which were lower factors of wisdom. Third, the impact of a lifetime educator's core competence on adult learners is not significant. It was found that core competence has an indirect influence on life capacity through the mediating effect of wisdom, and that wisdom has directly interfaced the relationship between core competence and life ability. Taken together, these results proved that the core competence and wisdom of a lifelong educator are important variables for adult learner's life abilities. Based on this, the core competence of lifelong educators being taught in the field of lifelong education should be enhanced, and the ability of adult learners to utilize the wisdom that has been developed through the experiences of adult learners, to improve their life skills.

• Korean Chemical Engineering Research
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• v.57 no.4
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• pp.475-483
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• 2019

Special chemical warfare agents are lethal gases that attack the human respiratory system. One of such gases are blood agents that react with the irons present in the electron transfer system of the human body. This reaction stops internal respiration and eventually causes death. The molecular sizes of these agents are smaller than the pores of an activated carbon, making chemical adsorption the only alternative method for removing them. In this study, we carried out a Computational Fluid Dynamics simulation by passing a blood agent: cyanogen chloride gas through an SG-1 gas mask canister developed by SG Safety Corporation. The adsorption bed consisted of a Silver-Zinc-Molybdenum-Triethylenediamine activated carbon impregnated with copper, silver, zinc and molybdenum ions. The kinetic analysis of the chemical adsorption was performed in accordance with the test procedure for the gas mask canister and was validated by the kinetic data obtained from experimental results. We predicted the dynamic behaviors of the main variables such as the pressure drop inside the canister and the amount of gas adsorbed by chemisorption. By using a granular packed bed instead of the Ergun equation that is used to model porous materials in Computational Fluid Dynamics, applicable results of the activated carbon were obtained. Dynamic simulations and flow analyses of the chemical adsorption with varying gas flow rates were also executed.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.20 no.6
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• pp.158-168
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• 2019

This study has researched and analyzed the relation among adolescents metabolic syndrome, dietary life, physical activity and mental health using $7^{th}$ National Nutrition Survey of $1^{st}$ year(2016) to provide the base data for the prevention of adolescent metabolic syndrome and the promotion of mental health. The subjects have been aimed at 13-18 year-old adolescents. The normal group consists of 201 males(56.4%) and 187 females(47.4%) and the adolescents with metabolic syndrome are composed of 9 males(56.4%) and 6 females(43.6%), totally 403 subjects. As a result of analyzing on the relation among adolescents' metabolic syndrome, dietary life, physical activity and mental health, the main influencing factors of metabolic syndrome are as follows. First, with regard to physical features, as BMI increases 1, the prevalence rate of metabolic syndrome multiplies 1.746 times. Second, when eating breakfast once to twice a week, the prevalence rate of metabolic syndrome decreases 0.87 times. Third, with regard to physical activity, as usual sitting hours a day increase 1 hour, the prevalence rate of metabolic syndrome multiplies 1.054 times. Fourth, the relation between metabolic syndrome and mental health of adolescents is not significant at all. Thus, the further study on metabolic syndrome focused on adolescents should be extended through the development of various variables of dietary life, physical activity and mental health focused on adolescents. In addition, the development of effective intervention program combining with dietary life, physical activity and mental health factors is necessary.

• Korean Chemical Engineering Research
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• v.57 no.5
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• pp.628-636
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• 2019

In various industrial processes, piping serves as a link between unit processes and is an essential installation for internal flow. Therefore, the optimum design of the piping system is very important in terms of safety and cost, which requires the estimation of the pressure drop, flow rate, pipe size, etc. in the piping system. In this study, we developed a software that determines pressure drop, flow rate, and pipe size when any two of these design variables are known. We categorized the flows into single phase, homogeneous two phase, and separated two phase flows, and applied suitable calculation models accordingly. We also constructed a system library for the calculation of the pipe material, relative roughness, fluid property, and friction coefficients to minimize user input. We further created a costing library according to the piping material for the calculation of the investment cost of the pipe per unit length. We implemented all these functions in an integrated environment using a graphical user interface for user convenience, and C # programming language. Finally, we verified the accuracy of the software using literature data and examples from an industrial process with obtained deviations of 1% and 8.8% for the single phase and two-phase models.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.20 no.1
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• pp.456-463
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• 2019

Micro climatic conditions within the livestock facility are affected by various factors such as ventilation, cooling, heating, insulation and latent and sensible heat generation from animals. In this study, numerical BES method was used to simulate energy flow inside the poultry house. Based on the BES method and THI concept, degree of thermal stress of poultry was evaluated according to the locations in South Korea. Comparison of THI values within the poultry house was also carried out according to the stocking densities to reflect recent animal-welfare issue. Significant decrease in thermal stress of poultry was observed when the stocking density of $30kg/m^2$ was applied in the change of the seasons(p<0.05) however, there was no statistically significant difference in summer season(p>0.05). It meant that installation of proper cooling system is urgently needed. For Iksan city of Jeollabuk-do province, total 252 hours of profit for thermal stress was found according to decrease in the stocking density.

• Korean Journal of Family Social Work
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• no.55
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• pp.31-58
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• 2017

This study aims to explore the longitudinal reciprocal relationship between family conflict and depression level of household head. Using the Korean Welfare Panel study (KOWEPS) of 2006-2009, the study applied multiple regression analysis and autoregressive cross-lagged model to test the hypothesis. Results of multiple regression analysis indicate that single direction of the impact of family conflict on a head of household's levels of depression and the vise versa were statistically significant. That is, higher level of family conflict in 2006 caused an increased levels of depression of household head in 2009, controlling gender, age and depression level in 2006. Also, the higher level of depression of household head in 2006 increased the level of family conflict in 2009 fixed with same control variables. The autoregressive and cross-lagged coefficients of family conflict and a head of household's levels of depression were statistically significant during the 4 years. The findings support the family system theory, indicating that there are reciprocal causal relationships between the whole family conflict and individual depression level. The strategies of social welfare practice and policy should thus aim to decrease individual's levels of depression and improve positive family function simultaneously to break the vicious circle.