• Journal of the Korean Recycled Construction Resources Institute
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• v.10 no.1
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• pp.1-8
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• 2022

In this study, the mechanical properties of concrete with recycled coarse aggregate (RG) selected by multi-stage wind pressure (MSWP) treatment were evaluated. After evaluating the basic properties of natural and recycled coarse aggregates, the mechanical performance of the recycled coarse aggregates concrete was experimentally investigated. As a result, it was found that the MSWP technique could improve the fundamental properties such as density and water absorption of RG. In addition, the concrete with RG selected by MSWP showed a better mechanical performance, indicating a higher strength values, surface electric resistivity and a lower absorption. Thus, it seems that the MSWP technique can be effective for the production of high-quality RG.

• Smart Media Journal
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• v.12 no.3
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• pp.77-84
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• 2023

Forest fires are representative natural disasters resulting from dramatic global climate change in these modern times. When forest formation is insufficient due to forest damage caused by fire, secondary damages such as landslides occur during the winter thawing period and heavy rains. In most countries, only a limited area is managed as CCTV-centered monitoring systems for forest management. For the landslide prediction, markers containing 3D spatial coordinates were located on the slopes of the danger areas in advance. Then 3D mapping and angle of repose were obtained by periodic drone imaging. The recognition range and angle of view of markers were defined, and a new method for predicting signs of landslides in advance was presented in this study.

• Journal of the Korean Society of Food Culture
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• v.25 no.3
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• pp.334-341
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• 2010

The objective of this study was to examine the quality characteristics and antioxidant activity of yogurt containing hot water extract from maca. Four different levels (0, 4, 8, 12%) of maca extract were added to milk followed by fermentation with lactic acid bacteria at $37^{\circ}C$ for 12 hrs, and then the physicochemical properties of the samples were investigated. During 7 days of storage at $4{\pm}1^{\circ}C$, the acid production (pH and titratable acidity) of the yogurt increased with the addition of maca extract. The Hunter L value (lightness) decreased, while the b value (yellowness) increased as the maca extract level in the yogurt increased. Viable cell counts were not significantly different among the samples. The results of consumer acceptance tests showed that no significant differences in overall acceptability were observed between the yogurts containing 4% and 8% of maca extract and a control yogurt. The yogurt containing maca extract exhibited higher DPPH radical and superoxide anion radical scavenging activities than the control yogurt over the storage period.

• Journal of Adhesion and Interface
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• v.24 no.4
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• pp.131-135
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• 2023

Lecithin self-assembles into reverse spherical micelles in organic solvents as an amphiphilic molecule. When additives such as bile salts and water are introduced into lecithin solutions, it induces structural changes in the molecular form of lecithin, leading to the transformation into reverse cylindrical micelles. In this study, we observe the rheological changes of lecithin/bile salt mixtures in a decane system after the addition of water. The resulting mixtures exhibit high viscosity and characteristics of viscoelasticity, suggesting potential applications in various fields such as drug delivery and edible oil gels.

• Journal of Korean Clinical Health Science
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• v.5 no.3
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• pp.963-972
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• 2017

Purpose. This study uses Ajzen's theory of planned behavior to investigate predictors associated with the intention of smoking cessation in smokers among high school students in a community. Method. The study population consisted of 138 smokers from high school students in a community. Between May to April 2015, Data was collected through questionnaires. Data analysis was performed using the PASW 21.0 program, and one-way ANOVA, Pearson correlation coefficients, and stepwise multiple regression analysis. Results. The mean intention of smoking cessation of this study was 3.98/5. The significant correlates of the intention of smoking cessation were attitudes toward smoking cessation (${\beta}=.36$, p=.003), self efficacy for smoking cessation (${\beta}=.44$, p<.001), satisfaction of school life (${\beta}=.22$, p=.009), number of friends smoking (${\beta}=.76$, p<.001), and previous experience of smoking cessation (${\beta}=.92$, p<.001). These variables explained 75.6% of variance in the intention of smoking cessation. Conclusion. The study suggests that various factors including previous experience of smoking cessation, number of friends smoking, self efficacy for smoking cessation and attitudes toward smoking cessation were important variables in explaining the intention of smoking cessation among high school students. Therefore, these variables are crucial in determining the promotion and intention of smoking cessation among high school students.

• Journal of Korean Clinical Health Science
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• v.5 no.3
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• pp.925-935
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• 2017

Purpose. This study was conducted in order to establish a self-growth group counseling program and examine the effects of self-esteem, ego-identity, and communicative competence among nursing students. Method. The study was designed using a non-equivalent control group pretest-post-test design. Data was collected from a period between March 13 and May 26, 2017, Participants involved were 66 second year nursing students in 1 College of K City, and were assigned to an experimental group (n=30), or a control group (n=33). A self-growth group counseling program was conducted over a period of 10 sessions for 10 weeks, once a week at 100 minutes per session. The data was analyzed using descriptive analysis, independent t-tests, and ${\chi}^2$ tests with t SPSS/WIN 21.0. Results. After completion of the program, a difference was observed in levels of self-esteem(t=3.14, p=.004), ego-identity(t=2.86, p=.006), and communicative competence(t=5.42, p=.011) of the experimental group. Conclusion. It is expected that these results would be helpful for increasing self-esteem, ego-identity, and communicative competence amopng nursing students by way of a self-growth group counseling program.

• Journal of Korean Biological Nursing Science
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• v.18 no.1
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• pp.17-26
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• 2016

Purpose: Adherence to immunosuppressants is the key to prevent organ rejection in organ transplant recipients. The purpose of this study was to investigate current interventions to improve adherence to immunosuppressants in liver transplant recipients. Methods: A systemic literature search was done using PubMed, Embase, Cochrane Library, CINAHL and four Korean databases to identify experimental studies reported in English or Korean up to and including 2015. We identified eight intervention studies on the adherence to immunosuppressants in liver transplant recipients independently reviewed by two reviewers. The quality and risk of bias of the selected studies were assessed. Results: Education, conversion of regimen, and text messaging were identified as intervention techniques to improve adherence. We found positive results in three out of four studies implementing educational strategies, but the results were not sufficient to draw a definite conclusion. Conversion from a twice-daily tacrolimus-based regimen to a once-daily tacrolimus extended-release formula was used in three adult-only studies and its effectiveness was confirmed. One study showed that improved adherence and outcomes were effected by using text messaging with pediatric patients. Conclusion: Future research is needed to facilitate interventions to improve adherence to immunosuppressants in various ages of patients including pediatric/adolescent liver transplant recipients.

• Journal of Environmental Health Sciences
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• v.46 no.1
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• pp.22-34
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• 2020

Objectives: Based on the concept of environmental justice, we developed an evaluation model for setting and adopting the direction of environmental health policy using environmental health indicators and statistics from the local governments of Seoul, including environmentally susceptible populations. Methods: We selected a total of 20 variables based on data officially released from national and local governments. After the classification of these variables into the five components of environmental pressure, environmental status, environmental disease, sensitive population, and socioeconomic status, a basic model was constructed to calculate the relative scores of the local governments. Results: The cumulative impact scores for assessment of environmental health status were similar to those of the environmental pressure and status components. The highest five cumulative impact scores fell between 114 and 147. Local government A reported the highest scores and had high environmental pressure, environmental status and socioeconomic status. In addition, the evaluation of the other four local governments indicated that they exhibited above average scores for environmental pressure and environmental status, two did so for environmental disease, and four for sensitive population. Conclusion: We constructed a model to evaluate the environmental health status of the local governments of Seoul based on cumulative impact scores under the concept of environmental justice. As an approach for studying environmentally vulnerable areas through relative ranking, this model was feasible for policy-setting. In addition, this approach would be an analytically useful tool for decision-makers.

• Transactions of the Korean hydrogen and new energy society
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• v.17 no.4
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• pp.395-402
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• 2006

Iodine-sulfur(IS) hydrogenation production process consists of three sections, which are so called a Bunsen reaction section, a HI decomposition section and a $H_2SO_4$ decomposition section as a closed cycle. For highly efficient operation of a Bunsen reaction section, we investigated the phase separation characteristics of $H_2SO_4-HI-H_2O-I_2$ system into two liquid phases($H_2SO_4$-rich phase and $HI_x$-rich phase) in the high temperature ranges, mainly from 353 to 393 K, and in the $H_2SO_4/HI/H_2O/I_2$ molar ratio of $1/2/14{\sim}30/0.3{\sim}13.50$. The desired results for the minimization of impurities in each phase were obtained in conditions with the higher temperature and the higher $I_2$ molar composition. On the basis of the distribution of $H_2O$ to each phase, it is appeared that the affinity between $HI_x$ and $H_2O$ was more superior to that between $H_2SO_4$ and $H_2O$.

• Journal of Physiology & Pathology in Korean Medicine
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• v.22 no.4
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• pp.907-913
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• 2008

Taraxci Herba (TH; Pogongyoung in Korean) has been used in traditional oriental medicine for the treatment of various ailments. The biological activity of this plant is not yet evaluated systematically. This study was conducted to evaluate the inhibitory effects of TH on the production of nitric oxide (NO) and the expression of inducible nitric oxide synthase (iNOS) in lipopolysaccharide (LPS)-activated Raw264.7 cells. The aim of the present work is to investigate a potential anti-inflammatory activity of TH. The Raw264.7 cells were cultured in DMEM medium for 24 h. After serum starvation for 12 h, the cells were treated with TH for 1 h, followed by stimulating NO production with LPS ($2{\mu}g/ml$). As result of this study, TH inhibited the levels of NO, PGE2, $TNF-{\alpha}$, IL-6 and $IL-1{\beta}$, and the expressions of inducible nitric oxide synthase (iNOS) and cyclooxygenase-2 (COX-2) activated by LPS. These inhibitory effects were mediated though the inhibition of phosphorylation of inhibitory kappa B ($I{\kappa}B$). These findings showed that TH could have some anti-inflammatory effects.