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Rasch 모형을 적용한 무용교수유형 선호도 측정척도의 타당화
김혜련 ( Hye-ryeon Kim ),손재현 ( Jae-hyun Shon ) 대한무용학회 2017 대한무용학회논문집 Vol.75 No.6
As a follow-up study of the study conducted by Kim Hye-ryeon (2016), As for dance teaching style preference measurement tool, First, results show that questions 25~30 of validity based on the contents of test are considered inappropriate. Second, validity evidence based on the reality turned out to be appropriate. Third, this study confirmed that validity based on the internal structure has a sufficient condition. Fourth, as for the validity based on the generalization, this study also confirmed through analysis of differential function that there are questions functioning differentially according to the grade (the lower grades, the higher grades) and major (Korean dance, ballet, modern dance).
Effect of file size in measuring electronic working length of teeth with open apex
Ryeon Jin,Ju-Hee Jeong,A-Ra Cho,Hyoung-Hoon Jo 조선대학교 치의학연구원 2022 Oral Biology Research (Oral Biol Res) Vol.46 No.1
This study aimed to evaluate the effect of file size in measuring the electronic working length of teeth with open apex. Twenty teeth were prepared to make the open apex models. A bur was used to cut a 2-mm apical end; the point where #10K file’s tip was reflected on the cut root surface was set to the actual root canal length (AL). A divergent open apex was prepared by retrograde apical preparation. The teeth that were covered with a gauze soaked with saline were inserted in a plastic mold, and an electronic apex locator was connected with it. In each tooth, #10, #20, #30, #40, #50, #60, #70, and #80 files were inserted into the root canal, and the electronic working length (EL) was measured at the “Apex” signal. Then, the mean difference (ΔL) between the AL and EL was evaluated for each file size. EL measurements with all file sizes were short of the apical foramen, and there was a significant difference when the file size increased from #10 to #20 and #40 to #50. Within this study’s limitations, the file size showed an impact in measuring the teeth’s EL with open apex. When the size of the apical foramen is 1.14 mm, it is more accurate to use a file of #50 size or larger when measuring the working length with an electronic apex locator.
( Ryeon Jin Cho ),( You-sun Kim ),( Ji-young Kim ),( Yeon-mok Oh ) 생화학분자생물학회(구 한국생화학분자생물학회) 2017 BMB Reports Vol.50 No.2
Emphysema, a pathologic component of the chronic obstructive pulmonary disease, causes irreversible destruction of lung. Many researchers have reported that mesenchymal stem cells can regenerate lung tissue after emphysema. We evaluated if spheroid human adipose-derived mesenchymal stem cells (ASCs) showed greater regenerative effects than dissociated ASCs in mice with elastase-induced emphysema. ASCs were administered via an intrapleural route. Mice injected with spheroid ASCs showed improved regeneration of lung tissues, increased expression of growth factors such as fibroblast growth factor-2 (FGF2) and hepatocyte growth factor (HGF), and a reduction in proteases with an induction of protease inhibitors when compared with mice injected with dissociated ASCs. Our findings indicate that spheroid ASCs show better regeneration of lung tissues than dissociated ACSs in mice with elastase-induced emphysema. [BMB Reports 2017; 50(2): 79-84]
Control of silica-zirconia nanoparticles for uniform porous SiO2-ZrO2 membranes.
Ryeon Lee, Hye,Lee, Jinkyeong,Seo, Bongkuk American Scientific Publishers 2014 Journal of nanoscience and nanotechnology Vol.14 No.11
<P>Silica-zirconia composite sols were prepared by means of a sol-gel method, using tetraethylorthosilicate (TEOS) and zirconium tetra-n-butoxide (ZrTB) precursors. TEOS, ZrTB, HCl, H2O and EtOH were mixed at 70 degrees C for 24 hours to give molar ratios of 1:1:8-80:0.2-1.0:100-300. The mean particle size of the silica-zirconia sol was controlled by the concentration of the alkoxides and catalyst, as well as the water molar ratio in the starting solution. The particle size of the SiO2-ZrO2 sol, which was analyzed by dynamic light scattering (DLS) and field emission scanning electron microscopy (FE-SEM), was in the range of 20 to 350 nm. The SiO2-ZrO2 sol solutions of different sol sizes were coated onto porous stainless steel supports (O.D. 10 mm, length: 20 mm, 316L SUS, Mott corp. USA) by a dipping-rolling-freezing-fast drying (DRFF) and soaking-rolling-freezing-fast drying (SRFF) method. After coating with SiO2-ZrO2 sol, the single gas permeation characteristics (He, H2 and N2) of the resulting SiO2-ZrO2 membranes were evaluated at room temperature. This produced a decrease in the mean flow diameter and H2/N2 permselectivity in the range of 2.0-3.5. Finally, following the results of gas permeation testing, the pore size of the membranes was controlled by changing their particle size.</P>
( Ryeon Jin Cho ),( You Sun Kim ),( Ji Young Kim ),( Sei Won Lee ),( Sang Do Lee ),( Yeon Mok Oh ) 대한결핵 및 호흡기학회 2014 대한결핵 및 호흡기학회 추계학술대회 초록집 Vol.118 No.-
Background: Stem cell treatments via intra-venous route were reported to restore emphysema in mice model. In these mice model, a serious adverse event, sudden death was recognized immediately after the infusion of stem cells. So we tried a different route of stem cell infusion via intra-pleural route and evaluated the effect of adipose-derived stem cells via intra-pleural infusion in elastase- induced emphysema mice. Methods: Mouse emphysema model was developed in C57BL/6 mice with the intra-tracheal injection of elastase(0.4 units/mice). 1×105 of ASCs were infused via intra-pleural route at 1week after elastase injection in C57BL/6 mice. Histological analysis of lung tissue was performed with the measurement of mean linear intercept (MLI) at 1week after ASCs intra-pleural infusion. Results: Elastase induced emphysema in these mice model (mean standard deviation of MLI: 122μm ± 17 μm, n=4 for elastase-injected mice, n=4 vs. 57μm ± 1 μm, n=2 for control mice, n=2 ) We observed the restoration of alveolar destruction by the infusion of adipose-derived stem cells via intra-pleural route in elastase-induced emphysema mice (MLI for ASCs-treated mice via intra- pleural route, 89μm ± 4 μm, n=4 vs. only elastase-injected mice 122μm ± 17 μm, n=4; p=0.0286). Conclusions: Intra-pleural route may be a candidate route of the stem cell treatment for lung diseases.
( Ryeon Jin Cho ),( You Sun Kim ),( Ji Young Kim ),( Seiwon Lee ),( Sang Do Lee ),( Yeon Mok Oh ) 대한내과학회 2014 대한내과학회 추계학술대회 Vol.2014 No.1
Background: Stem cell treatments via intra-venous route were reported to restore emphysema in mice model. In these mice model, a serious adverse event, sudden death was recognized immediately after the infusion of stem cells. So we tried a different route of stem cell infusion via intra-pleural route and evaluated the effect of adipose-derived stem cells via intra-pleural infusion in elastase-induced emphysema mice. Methods: Mouse emphysema model was developed in C57BL/6 mice with the intra- tracheal injection of elastase(0.4 units/mice). 1x10<sup>5</sup> of ASCs were infused via intra-pleural route at 1week after elastase injection in C57BL/6 mice. Histological analysis of lung tissue was performed with the measurement of mean linear intercept (MLI) at 1week after ASCs intra-pleural infusion. Results: Elastase induced emphysema in these mice model (mean standard deviation of MLI: 122μm ± 17 μm, n=4 for elastase-injected mice, n=4 vs. 57μm ± 1 μm, n=2 for control mice, n=2 ) We observed the restoration of alveolar destruction by the infusion of adipose-derived stem cells via intra-pleural route in elastase-induced emphysema mice (MLI for ASCs-treated mice via intra-pleural route, 89μm ± 4 μm, n=4 vs. only elastase-injected mice 122μm ± 17 μm, n=4; p=0.0286 ). Conclusions: Intra-pleural route may be a candidate route of the stem cell treatment for lung diseases.