• Journal of Digital Convergence
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• v.17 no.3
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• pp.253-260
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• 2019

This study was conducted to test the effects of flipped learning on learning motivation, academic self-efficacy and critical thinking disposition for undergraduate nursing students. This study used a one group pre-post test design. Participants were 88 nursing students. The flipped learning was provided for 4 times(8 hours) in adult nursing. Data were collected between March 5 and June 8, 2018. Data were analyzed by frequencies, paried t-test using SPSS/WIN 23.0. The results showed that learning motivation (t=12.7, p<.001) was significantly lower than levels before flipped learning, academic self-efficacy (t=-3.01, p<.001) was significantly higher than levels before flipped learning and critical thinking disposition (t=-.51, p=.606) was higher than levels before flipped learning but was no significantly. The study findings suggest that the flipped learning has proven to be influential educational program for improving the academic self-efficacy, critical thinking disposition of nursing students. The flipped learning was an effective teaching program for nursing students. But Learning motivation is decreased, It is necessary to develop flipped learning that can improve learning motivation.

• Journal of the Korean Applied Science and Technology
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• v.33 no.3
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• pp.606-613
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• 2016

The purpose of this study is to analyze the possibility of a residual product of coffee (RC). RC oil extracted with n-hexane at $60({\pm}10)^{\circ}C$ for 24 hours. In this study, the cytotoxicity of RC oil was observed against B16F10 melanoma cells and RAW 264.7 macrophage cells by water solubletetrazolium salt-1 assay, and The RC oil measured by methods of DPPH radical scavenging and antimicrobial activities in Staphylococcus aureus, Staphylococcus epidermidis, Escherichia coli, Candida albicans. As a result, the RC oil treatment-related cytotoxic effects appeared on B16F10 melanoma cells from 0.125 to $2{\mu}{\ell}/m{\ell}$ and RAW 264.7 macrophage cells from 0.125 to $0.5{\mu}{\ell}/m{\ell}$ concentrations in this study. RC oil is radical scavenging activity concentrations on dependent. The antimicrobial activity of RC oil ($150{\mu}l/{\ell}$) was determined by clear zone method. Straphylococcus epidermidis, Straphylococcus aureus, Escherichia coli, Candida albicans showed clear zone by each $11.3{\pm}0.4$, $12.{\pm}0.7$, $12.0{\pm}0.0$, $0.0{\pm}0.0mm$. It is suggested that RC oil have effects on the cytotoxicity, antioxidant and antimicrobial that could be applicable to cosmetics as a new material.

• The Korean Journal of Malacology
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• v.19 no.2
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• pp.143-152
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• 2003

Water temperature during the culturing period was 10.4-25.5$^{\circ}C$ and there was a little difference between rearing sites. Salinity (25.00-31.17 psu) and DO (over 6.13 mg/l) showed reasonable condition for the growth of bay scallop. Concentrations of chlorophyll-a were ranged 1.69-7.40 $^{\mu}$g/l, and they fluctuated monthly in the every sampling site. During the growing period from June to October, dominant phytoplankton species were Ceratium sp. in Nammeon and Hoejin, Chaetoceros sp. in Dolsan. Density of phytoplankton was high in July, August and October, but it was low in September and November. When young bay scallops were cultured for 185 days in Nammyeon, Hoejin and Dolsan, shell heights were grown for 0.19 mm/day, 0.18 mm/day and 0.16 mm/day, respectively, and total weights were increased 0.16 g/day, 0.16 g/day and 0.13 g/day, respectively. Daily growth rates of shell height were 0.606%, 0.581% and 0.549%, and daily growth rates of total weight were 1.972%, 1.857% and 1.746%, respectively. Maximum predicted values of shell height calculated by von Bertalanffy growth model were 52.62 mm, 51.74 mm and 48.91 mm, respectively. Survival rate was the highest in Nammyeon (87.0%), but the rates in Hoejin and Dolsan sharply decreased after November.

• Journal of Korean Society of Forest Science
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• v.105 no.2
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• pp.186-192
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• 2016

This study was conducted to develop microsatellite markers in Quercus variabilis using next generation sequencing. A total of 305,771 reads (384 bp on average) were generated on a Roche GS-FLX system, yielding 117 Mbp of sequences. The de novo assembly resulted in 7,346 contigs. A total of 606 contigs (20.75%) including 911 microsatellite loci were derived from the 2,921 contigs longer than 500 bp. A total of 180 primer sets were designed from the 911 microsatellite loci and screened in eight Q. variabilis individual trees sampled from a natural stand to obtain polymorphic loci. As a result, a total of thirteen polymorphic microsatellite loci were selected and used for estimating population genetic parameters in the 54 individual trees. The mean number of effective alleles was 4.996 ranging from 2.439 to 7.515. The observed heterozygosity and the expected heterozygosity ranged between 0.731 and 1.000 with an average of 0.873 and from 0.590 to 0.867 with an average of 0.766, respectively. Null alleles were not detected in all loci. No significant linkage disequilibrium was detected after Bonferroni correction in all loci. In the near future, these novel polymorphic microsatellite markers will be used to study population and conservation genetics of Q. variabilis of Korea in more detail.

• The Journal of the Convergence on Culture Technology
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• v.8 no.2
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• pp.265-272
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• 2022

This study is a descriptive study to identify the factors affecting breast cancer screening behavior in women of childbearing age. The participants were 2,000 women between the ages of 19 and 40, and data collection was conducted through online and mobile surveys from September 2020 to August 2021. As a result of multivariable ordinal logistic regression analysis, age 20-29 (OR=2.145, CI=1.219-3.777), over 30 (OR=5.663, CI=2.784-11.521), annual income less than 10 million won (OR=1.606, CI=1.070-2.413), over 30 million won (OR=2.422, CI=1.550-3.785), family history of breast cancer (OR=2.421, CI=1.154-5.080), family history of ovarian cancer (OR=4.321, CI=1.382-13.516), subjective perception of health status was 'moderate' (OR=1.466, CI=1.064-2.020), and 'not healthy' (OR=1.854, CI=1.188-2.895) increased the breast cancer screening behavior. Therefore, based on this study, adequate policy should be adopted to strengthen the breast cancer screening behavior of young women of childbearing age.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.13 no.2
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• pp.606-614
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• 2012

With rising concerns on downturn of global economy, college graduates are experiencing a serious unemployment crisis. In this reality, undergraduates preparing for employment face much stress from worries and conflicts. Accordingly, the purpose of this study is to examine the influence of university student's belief of destiny on sub factors of employment stress such as environmental, physical, psychological and keen behaviors according to internal and external locus of control. 550 surveys were distributed to four-year university students in Seoul, capital area and rural area for 15 days from October 5 until October 20, 2011. 480 surveys were returned, among which 430 were effective as study subjects. As a result of this study, first, environmental influence on employment stress was high at 49% while physical influence was 7%. Second, as a result of performing correlation analysis on employment stress and locus of control, external locus of control showed positive influence in environmental, physical, psychological and keen behaviors. Internal locus of control showed negative influence in all behaviors, suggesting that more diverse career information must be provided. Since increase in career efficacy and reduction of employment stress in university students are directly linked to unemployment rate of youths, diverse and active methods are deemed necessary.

• Journal of the Korean Vacuum Society
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• v.1 no.1
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• pp.67-72
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• 1992

The growth of Ti on Si(111)-$7{\times}7$ and the formation of epitaxial C54 $TiSi_2$ were investigated by using reflection high energy electron diffraction(RHEED) and high resolution transmission electron microscopy(HRTEM). Polycrystalline Ti layer is grown on the amorphous Ti-Si interlayer which is formed at the Ti/Si interface by Ti deposition on Si(111)-$7{\times}7$ at room temperature (RT). HRTEM lattice image and transmission electron diffraction(TED) showed that epitaxial C54 $TiSi_2$ grown on Si substrate with 160 ML of Ti on Si(111)-$7{\times}7$ surface at RT, followed by annealing at $750^{\circ}C$ for 10 min in UHV. Thin single crystal Si overlayer with [111] direction is grown on $TiSi_2$ surface when $TiSi_2$/Si(111) is annealed at ${\sim}900^{\circ}C$ in UHV, which was confirmed by Si(111)-$7{\times}7$ superstructure.

• Journal of the Korean Applied Science and Technology
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• v.32 no.1
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• pp.93-99
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• 2015

The aim of this study was to analyze nutritional compositions of rapeseed pollen granules and to determine the possible usage of pollen granules as a yeast culture medium. Rapeseed pollen granules (per 100 g) were consisted of carbohydrate 58.9 g, protein 20.8 g, fat 4.1 g, ash 2.5 g and water 13.7 g. And fructose (13.7 g), glucose (11.1 g), and sucrose (6.6 g) of sugars and K (606.7 mg) and P (603.3 mg) of minerals were highly contained. In addition, free amino acids such as glutamic acid (2,482.4 mg), aspartic acid (2,136.5 mg), lysine (1,648.3 mg), and leucine (1,631.1 mg) were present at a higher level. When liquid medium, which was made from cracked pollen granules (5, 10, 15, 20, 25, 30, and 40 g/L), was tested for yeast culture, liquid medium containing pollen granules over 15 g/L showed higher yeast growth than YPD medium (control). Liquid medium containing both cracked pollen granules (15 g/L) and NaCl (1 ~ 20 g/L) improved yeast growth than the liquid medium without NaCl. In addition, when yeast growth was tested on solid medium made from pollen granules (15 g/L) at $30^{\circ}C$ for 2 days, yeast colonies were equally well-formed like those grown on YPD medium. Overall, rapeseed pollen granules have potential properties on yeast growth and could be used as a primary source for yeast culture.

• Microbiology and Biotechnology Letters
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• v.34 no.3
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• pp.196-203
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• 2006

Three slime-forming lactic acid bacteria were isolated from Kimchi and shown to produce viscous exopolysaccharides (EPS) in sucrose media. The isolated strains, GJ2, C3 and C11, were identified as Leuconostoc kimchii, Leuconostoc citreum and Leuconostoc mesenteroides, respectively, by examining their metabolic characteristics and determining their 16S rDNA sequences. Leu. kimchii GJ2, Leu. citreum C3 and Leu. mesenteroides C11 exhibited high viability (maintained initial viable cell count of $10^8$ CFU/ml) in 0.05 M sodium phosphate buffer (pH 3.0) for 2 h, in artificial gastric juice for 2 h and in 0.3% oxgall for 24 h. When tested, Leu. kimchii GJ2, in particular, displayed antimicrobial activity against pathogenic microorganisms. Leu. kimchii GJ2, Leu. citreum C3 and Leu. mesenteroides C11 produced 21.49 g/l, 16.46 g/l and 22.98 g/l EPS, respectively, in sucrose (5%) medium. The amount of purified EPS extracted from Leu. kimchii GJ2, Leu. citreum C3 and Leu. mesenteroides C11 was 14.61 g/l, 7.73 g/l and 4.77 g/l, respectively. Although the EPS produced by Leu. kimchii GJ2, Leu. citreum C3 and Leu. mesenteroides C11 differed in viscosity, TLC and HPLC analysis revealed that each contained only one type of monosaccharide, glucose. The average molecular mass of EPS produced by Leu. kimchii GJ2 was 306,606 Da.

• Journal of Korean Society of Forest Science
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• v.100 no.3
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• pp.455-465
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• 2011

In order to assess and mitigate climate change, the role of forest biomass as carbon sink has to be understood spatially and quantitatively. Since existing forest statistics can not provide spatial information about forest resources, it is needed to predict spatial distribution of forest biomass under an alternative scheme. This study focuses on developing an upscaling method that expands forest variables from plot to landscape scale to estimate spatially explicit aboveground biomass(AGB). For this, forest stand variables were extracted from National Forest Inventory(NFI) data and used to develop AGB regression models by tree species. Dominant/codominant height and crown density were used as explanatory variables of AGB regression models. Spatial distribution of AGB could be estimated using AGB models, forest type map and the stand height map that was developed by forest type map and height regression models. Finally, it was estimated that total amount of forest AGB in Danyang was 6,606,324 ton. This estimate was within standard error of AGB statistics calculated by sample-based estimator, which was 6,518,178 ton. This AGB upscaling method can provide the means that can easily estimate biomass in large area. But because forest type map used as base map was produced using categorical data, this method has limits to improve a precision of AGB map.