Gumi, South Korea

Time filter

Source Type

Kim M.J.,Gwangju Institute of Science and Technology | Lee J.J.,Gwangju Institute of Science and Technology | Lee S.H.,Kyungwoon University | Sohn S.H.,Kyungpook National University
Solar Energy Materials and Solar Cells | Year: 2013

A CdTe/CdS heterostructure was fabricated on Fluorine Tin Oxide glass to produce thin-film photovoltaic devices. A CdCl2 layer was deposited onto the CdTe absorber layer and the subsequent annealing of the stack was performed in a He atmosphere. The influence of the CdCl2-activation step on the interfaces was investigated by monitoring the phase transition of CdCl2-heat-treated CdTe specimens during temperature ramp annealing via in situ high-temperature X-ray diffraction. X-ray Photoelectron Spectroscopy depth profiling data confirmed the interdiffusion between the CdTe and CdS layers through observation of the binding energy shifts and atomic ratio. The experimental results reveal that a compressive force, which is due to the formation of CdTeCdCl2 eutectic liquid phases between grains, which cause the capillary action of such liquid phases, seems to introduce a compressive strain in the plane of the film that facilitates the recrystallization process. © 2012 Elsevier B.V. All rights reserved.


Sun-Yeun H.,Kyungwoon University | Mi-Ye K.,Kyungpook National University
International Journal of Applied Engineering Research | Year: 2016

The intent of this study was to develop a program of delivery nursing care education involving the use of hybrid simulation, and examine how it influenced the knowledge of delivery nursing care, performance competence for delivery nursing care, and problem-solving ability of students. The development of the program proceeded according to the normal delivery procedure, with the highest level of emphasis on in-class practice based on the results of a survey of nursing college students that was conducted in advance. The delivery nursing care education program based on hybrid simulation reflected nursing knowledge and technical and attitudinal aspects required from the first to fourth phases of delivery, and was modified and supplemented through model implementation. In terms of the operation of the program, the delivery scenario developed by utilizing standardized patients and a high-performance simulator on nursing college students was applied. As for the evaluation of the program, knowledge of delivery nursing care and problem-solving ability were evaluated through the survey, and performance competence for delivery nursing care was evaluated by applying actual delivery cases. According to the results of the study, college nursing students who participated in the delivery nursing care education program based on hybrid simulation were found to have a statistically significantly higher level of knowledge and performance competence for delivery nursing care. Based on the aforementioned results, the program for delivery nursing care education based on hybrid simulation was confirmed to be effective in reinforcing the core abilities of nursing college students. In addition, it seems to be feasible to utilize this program in the future as replacement education for clinical practice. © Research India Publications.


Kim M.S.,Inje University | Yim K.G.,Inje University | Son J.-S.,Kyungwoon University | Leem J.-Y.,Inje University
Bulletin of the Korean Chemical Society | Year: 2012

Aluminium (Al)-doped zinc oxide (AZO) thin films with different Al concentrations were prepared by the solgel spin-coating method. Optical parameters such as the optical band gap, absorption coefficient, refractive index, dispersion parameter, and optical conductivity were studied in order to investigate the effects of the Al concentration on the optical properties of AZO thin films. The dispersion energy, single-oscillator energy, average oscillator wavelength, average oscillator strength, and refractive index at infinite wavelength of the AZO thin films were found to be affected by Al incorporation. The optical conductivity of the AZO thin films also increases with increasing photon energy.


Kwon K.,Kyungwoon University | Koong H.-S.,Konyang University | Kang K.-H.,Konyang University
Technology and Health Care | Year: 2016

We investigated the burdock extract on the inhibitions of NO generation, COX-2 expression, and the generations of IL-6 and TNF-α, to find out its anti-inflammatory effect in this study. After the treatment of the burdock extract in the cells, we measured the amount of NO generated in the inflammatory cells developed by LPS and UVB, and confirmed the developments of inflammatory mediators by RT-PCR. Upon the results on the NO generation after the development of inflammation by LPS in Raw 264.7 cell, we found approximately 50% of inhibitory effect at 200 μg/ml concentrations of the burdock extract. It was confirmed that the expression levels of TNF-α, COX-2, and IL-6 were declined to the levels of control by LPS and UVB stimulated inflammation in HaCat cell. This means the anti-inflammatory effect of the burdock extract. © 2016 - IOS Press and the authors. All rights reserved.


Bae S.E.,Korea University | Cho S.Y.,Korea University | Won Y.D.,Black Garlic | Lee S.H.,Kyungwoon University | And 2 more authors.
LWT - Food Science and Technology | Year: 2014

This study aimed to investigate the effects of temperature on the black garlic manufacturing process. The moisture content, pH, browning intensity, S-allyl cysteine (SAC) content and antioxidant activity, including DPPH radical scavenging activity and reducing power, were determined. The moisture content of garlic gradually decreased throughout the heating process. The rate of moisture removal was higher at high temperatures compared with low temperatures. The pH also decreased more significantly in garlic heated at high temperatures. The browning intensity increased with increasing temperature. The SAC contents of black garlic were significantly different according to heating temperature; the garlic samples heated at a low temperature had a higher SAC contents. Antioxidant activity, as determined by the DPPH radical scavenging activity and reducing power, increased when the garlic was exposed to higher temperatures. © 2013 Elsevier Ltd.


Bae S.E.,Korea University | Cho S.Y.,Korea University | Won Y.D.,Black Garlic | Lee S.H.,Kyungwoon University | And 2 more authors.
LWT - Food Science and Technology | Year: 2012

A sensitive and reproducible analytical method to measure S-allyl cysteine (SAC) in black garlic was developed using the HPLC-FLD (fluorescence detection) with prior derivatization with AccQ-Fluor Reagent. The results were then compared with those from obtained using the HPLD-UVD (ultraviolet detection) that has been conventionally used for measuring SAC in raw garlic. The SAC content in raw garlic measured by the HPLC-FLD and the HPLD-UVD were 21.52 and 22.73μg/g, respectively. And these results were satisfactory with %CV (coefficient of variation) less than 2%. However, the application of the HPLC-UVD for the determination of SAC in black garlic was limited due to the high %CV that arose from the unstable baseline. However, the HPLC-FLD could be applied to the measurement of SAC in black garlic with satisfactory %CV. The HPLC-FLD method was validated by determining the linearity, limit of detection, limit of quantification, accuracy and precision. This method showed excellent linearity with a coefficient of determination (R 2) greater than 0.998. The limits of detection (LOD) and the limit of quantification (LOQ) were 6.28 and 19.02μg/mL, respectively. The accuracy ranged from 98.51 to 102.08%, and the precision of the method was found to be less than 2%. © 2011 Elsevier Ltd.


Kim J.,Korea University | Cho H.-C.,Korea University | Jung H.-S.,Korea University | Yoon J.-D.,Kyungwoon University
Journal of Strength and Conditioning Research | Year: 2011

This study examined the relationship between 30-second anaerobic power and body composition by performance level in elite Judoists. During a 3-month period, 10 male Korean Judo national team athletes (NT), 26 male university varsity team athletes (VT), and 28 male junior varsity team athletes (JT) were assessed for 30-second anaerobic power and body composition at the Youngin University. Anaerobic power was measured using a 30-second Wingate test. Body composition was assessed via bioelectric impedance analysis in standardized conditions using BioSpace (Korean)-specific prediction formulas. All testing occurred at the beginning of the winter nonseason period but excluded a brief weight-loss period before the competition phase. Anaerobic power measures were significantly greater (p < 0.05) in NT and VT than in JT. Fat-free mass (FFM), muscle mass (MM), and total body water in JT were also greater than in VT and JT (p < 0.05). Muscle mass in VT was significantly lower than in NT (p < 0.05). Fat-free mass in NT was strongly correlated to mean and peak anaerobic power (r = 0.77, p = 0.009; r = 0.87, p < 0.001, respectively). Varsity team athletes also indicated a moderate association between FFM and peak and mean anaerobic power (r = 0.63, p < 0.001; r = 0.48, p = 0.013, respectively). However, relationship between FFM and anaerobic power was not statistically significantly correlated in JT (r = 0.14, p = 0.470; r = 0.23, p = 0.232, separately). In conclusion, our data indicated that anaerobic power is closely correlated with increase in FFM and MM and was different dependent among performance levels. Further research in the field is warranted to elucidate the Judo-specific relationship between FFM and performance. © 2011 National Strength and Conditioning Association.


Park S.-C.,Korea University | Jeong I.-H.,Korea University | Kang J.-H.,Kyungwoon University
International Journal of Bio-Science and Bio-Technology | Year: 2015

The purpose of this study is to compare the differences between Shear compression load using shear compression loads tester (858 Bionix, MTS, USA) with fixed screws in the force of 30 N·cm using in four different fastening methods with implanting(N=5) fixture an abutment. As a result of the experiment, the compression load of YI Implant which is the compression load of Internal octagon connection Implant , Non submerged type taking morse taper of 8° was the highest as 1208.20 N·cm, that of Internal hexagon connection Implant which is submerged type taking morse taper of 11° was the lowest as 617.60 N·cm. The relevance of the shear compression load test which was done by four different fastening methods with implanting fixture an abutment, showed a statistically significant difference (p <0.001). © 2015 SERSC.


Jang H.J.,Yeungnam University | Hong S.Y.,Kyungwoon University
International Journal of Multimedia and Ubiquitous Engineering | Year: 2016

This study is a pre-post design experimental research on a nonequivalent control group with the aim of identifying the effects of blended learning in nursing education on critical thinking and learning satisfaction of the nursing students. The research subjects were 79 second-year nursing students of K University in G region, composed of 39 students in the control group and 40 students in the experimental group, gathered through convenience sampling. The two groups equally went through the pre-test using the questionnaire for data collection. Afterwards, blended learning was applied to the experimental group for three weeks in total. The collected data was analyzed using the SPSS PC+20.0 for windows. According to the research, the experimental group that participated in blended learning had a statistically significantly high score for critical thinking (t=-6.21 p<.001) and had a high, but not statistically significant, score for learning satisfaction (t=-.52, p=.683). Given the research findings, it was determined that blended learning in nursing education was more effective in improving the critical thinking of nursing students than the existing nursing education curriculum. © 2016 SERSC.


Seo B.D.,Kyungwoon University | Kim B.J.,Pusan National University | Singh K.,Harvard University
European Geriatric Medicine | Year: 2012

Objectives: The purpose of this study is to compare the effectiveness of resistance and balance exercise in reducing the risk of falls for females 65-years-old or older. Design: The study was a single blind, controlled trial, conducted over a period of 12-weeks with pre- and post-exercise assessment. Patients and methods: Ninety-five participants were randomly assigned to one of three groups: resistance-training group, balance training group, control group. Resistance training group were trained to increase strength of upper, lower. Balance training group were trained to improve balance, coordination and proprioception. Outcome measurement consisted of balance ability, muscle strength, proprioception and fall efficacy. Results: The resistance and balance exercise group showed a statistically significant improvement in balance ability compared to the control group (P < 0.01). The resistance exercise group showed significant improvement in muscle strength compared to the balance exercise group (P < 0.01). The balance exercise group showed significant improvement in proprioception compared to the resistance exercise group (P < 0.01). Both resistance and balance exercise showed a significant improvement in fall efficacy than the control group (P < 0.01). Conclusions: We conclude that the resistance and balance exercise have significant effects on balance ability and falls efficacy in older females. © 2012 Elsevier Masson SAS and European Union Geriatric Medicine Society. All rights reserved.

Loading Kyungwoon University collaborators
Loading Kyungwoon University collaborators