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The effects of Sm and Y addition on the properties of YBCO thin film prepared by a DCA-MOD method
Kim, B.J.,Yu, J.H.,Lee, J.B.,Yoo, Y.S.,Kim, J.G.,Lee, H.G.,Hong, G.W. North-Holland 2009 Physica. C, Superconductivity Vol.469 No.15
Off-stoichiometric (Y<SUB>1</SUB>RE<SUB>x</SUB>)Ba<SUB>2</SUB>Cu<SUB>3</SUB>O<SUB>7-δ</SUB>; (x=0-0.4, RE=Y or Sm) films have been prepared on LaAlO<SUB>3</SUB> (100) single-crystal substrates by a metal-organic deposition using dichloroacetic acid as chelating solution. Coating solutions with excess Sm or Y were prepared by dissolving Y, Sm, Ba and Cu acetates in dichloroacetic acid and distilled water followed by refluxing, drying to obtain blue gel. The final precursor solution for dip coating was prepared by diluting blue gel in 2-methoxyethanol. Coated films were calcined at low temperature up to 500<SUP>o</SUP>C in flowing humid oxygen atmosphere. Conversion heat treatment was performed at 800<SUP>o</SUP>C for 2h in flowing Ar gas containing 1000ppm oxygen with a humidity of 9.45%. The viscosities of the precursor solution were increased as the content of added Sm or excess Y increased. The transport critical current density (J<SUB>c</SUB>) of (Y<SUB>1</SUB>RE<SUB>x</SUB>)Ba<SUB>2</SUB>Cu<SUB>3</SUB>O<SUB>7-δ</SUB>; film was enhanced with the addition of excess Sm and Y up to 20% and then decreased with further addition. Scanning electron microscope (SEM) observation showed that surface roughness was increased with the addition of excess Y.
( F. Mcphee ),( L. Wei ),( Q. Xie ),( Y. Suzuki ),( J. Toyota ),( Y. Karino ),( K. Chayama ),( Y. Kawakami ),( M. L. Yu ),( S. H. Ahn ),( N. Zhou ),( H. Kumada ) 대한간학회 2016 춘·추계 학술대회 (KASL) Vol.2016 No.1
Aims: Daclatasvir (DCV) plus asunaprevir (ASV) has demonstrated highsustained virologic response (SVR) in HCV genotype (GT-)1b infection.NS5A-Y93H and NS5A-L31 resistance-associated polymorphisms(RAPs) to DCV are known to impact DCV+ASV response in GT-1b-infectedJapanese. The effect of RAPs on SVR at posttreatment week12 (SVR12) to DCV+ASV was explored in mainland Chinese, Korean,and Taiwanese.Methods: Pooled data from 2 studies of DCV (60 mg daily) + ASV(100 mg capsule, twice-daily) for 24 weeks in GT-1b-infected interferon/ribavirin-naive and -experienced patients from mainland China,Korea, and Taiwan. Similar Japanese data (4 studies; n=445) werepooled for comparison. SVR12 with versus without baseline Y93Hand/or L31 RAPs was compared by age (<65 vs ≥65 years), cirrhosisstatus, and baseline HCV-RNA.Results: SVR12 and baseline NS5A sequences were available for 282patients (126 mainland Chinese [45%〕, 80 Koreans [28%〕, 76Taiwanese [27%〕). NS5A-Y93H and/or -L31 RAPs were observed pretreatmentin 8% mainland Chinese, 14% Korean, and 18%Taiwanese patients, compared with 19% in Japanese. SVR12 in allnon-Japanese patients is shown (Figure); rates were broadly similarbetween countries and with Japanese data (Japanese: 96% overallwithout RAPs, 41% with RAPs). Responses were lower among patientswith baseline RAPs. By contrast, SVR12 in patients without RAPs washigh (92-100%), irrespective of cirrhosis, age, or baseline HCV-RNA.Conclusions: At least 95% of HCV GT-1b-infected patients from mainlandChina, Korea or Taiwan without baseline NS5A-Y93H or -L31polymorphisms who had HCV-RNA ≤7 log10 IU/mL achieved SVR12on DCV+ASV, regardless of cirrhosis status and age.
김단비,김민지,김해솔,김희정,박윤선,손유경,송예진,유예림,이다예,이서영,이지현,강숙정,김부연 이화여자대학교간호학회 2020 이화간호학회지 Vol.- No.54
Purpose: The purpose of this descriptive study was to examine hospital choice factors among elderly patients to understand their experience and use as data to move towards senior-friendly hospitals. Methods: The individual in-depth interviews were conducted from August 13th to 18th, 2019. The participants consisted of eight senior citizens aged 65 and above that suffered from chronic illnesses and had regular hospital visits. Results: This study found that when elderly patients choose the hospital, they considered ‘awareness such as brand name of the hospital', ‘quality of medical service',‘convenience', ‘healthcare team / hospital employee', ‘personal experience', ‘children’s recommendation’ and etc,. The significant point was that all these factors were related to personal experiences from specific hospitals. Conclusion: This study analyzed the hospital choice factors of the elderly patients with high hospital utilization rates and found that the results were mainly affected by the distinct characteristics of elderly patients. The implications of this study are that we proposed further research directions and means for the improvement of the hospital. We suggest hospitals to increase labor allocation for elderly patients with difficulties dealing with unmanned systems such as kiosk and strengthen the role of healthcare providers as instructors for higher satisfaction.
Yu, K‐,H.,Hong, K‐,S.,Lee, B‐,C.,Oh, M‐,S.,Cho, Y‐,J.,Koo, J‐,S.,Park, J‐,M.,Bae, H‐,J.,Han, M‐,K.,Ju, Y‐,S.,Kang, D‐,W.,Appelros, P. Blackwell Publishing Ltd 2011 Acta neurologica Scandinavica Vol.123 No.5
<P>Yu K‐H, Hong K‐S, Lee B‐C, Oh M‐S, Cho Y‐J, Koo J‐S, Park J‐M, Bae H‐J, Han M‐K, Ju Y‐S, Kang D‐W, Appelros P, Norrving B, Terent A. Comparison of 90‐day case‐fatality after ischemic stroke between two different stroke outcome registries using propensity score matching analysis. Acta Neurol Scand: 2011: 123: 325–331. © 2010 John Wiley & Sons A/S.</P><P><B>Background – </B> It has not been clarified whether the disparity in ischemic stroke outcome between populations is caused by ethnic and geographic differences or by variations in case mix. Propensity score matching (PSM) analysis can overcome some analytical problems but is rarely used in stroke outcome research. This study was to compare the ischemic stroke case‐fatality between two PSM cohorts of Sweden and Korea.</P><P><B>Methods – </B> Prognostic variables related to baseline characteristics and stroke care were included in our PSM model. Then, we selected 7675 Swedish and 1220 Korean patients with ischemic stroke from each stroke registers and performed one‐to‐one matching based on propensity scores of each patient.</P><P><B>Results – </B> After PSM, all measured variables were well balanced in 1163 matched subjects, and the 90‐day case‐fatality was identical 6.2% (HR 0.997, 95%CI 0.905–1.099) in Sweden and Korea.</P><P><B>Conclusions – </B> No difference is found in the 90‐day case‐fatality in propensity score‐matched Swedish and Korean patients with ischemic stroke.</P>
EHP와 RRV의 Coinfection에 의한 Reassortants 선발에 관한 연구
유제현,조홍찬,송진욱,김유성,이영건,박선오,이종익,김응률,차광종,류영수,Harry B. Greenberg 건국대학교 동물자원연구센터 1998 動物資源硏究誌 Vol.19 No.-
본 연구는 두 종류의 rotavirus strain MA104 cell 상에서 동시감염시킨 후 gene이 서로 교차된 새로운 reassortants를 선발하기 위해 수행하였으며, 수행한 결과는 다음과 같다. 1. EHP T 와 RRV를 MA104 세포에 감염시켜 cytopathic effect(CPE)를 확인하였으며 확인된 virus를 수확하였다. 2. Coinfection의 mobility of infection은 각각 EHP T는 0.3(3*10?? PFU), RRV는 2.5(2.5*10?? PFU)이었다. 3. EHP T와 RRV를 coinfection하여 plaque assay에 의해 형성된 plaque들을 pick up하였다. 4. EHP T와 RRV를 동시감염시켜 얻어진 plaques를 MA104 cell에 재감염한 후 grow up하여 수확하였다. 5. Plaques를 24 Well의 MA104 cell에 감염하여 수확한 후 dsRNA를 추출하여 전기영동에 의해 26개 reassortants를 선발하였다. This study was carried out to select new reassortants whose genes were exchanged by confection of two strains. The results obtained in these experiments were as follows: 1. Cytopathic effect was checked out in the experiment in which made MA104 cells infected by EHP T (murine rotavirus) and RRV(simian rhesus rotavirus). And then the viruses were obtained from the procedure. 2. Mobility of infection(MOI) of EHP T and RRV were 0.3(3*10?? plaque forming units) and 2.5(2.5*10?? plaque forming units)respectively. 3. After coinfection of EHP T and RRV, plaques which formed in plaque assay were picked up. 4. Coinfected EHP T and RRV plaques were grown up in 24 well of MA104 cell and then grown-ups or those were obtained. 5. By polyacrylamide gel electrophoresis(PAGE) of dsRNA extracted above, 26 reassortants were selected.
Y/Gd-free yellow Lu<sub>3</sub>Al<sub>5</sub>O<sub>12</sub>:Ce<sup>3+</sup> phosphor for white LEDs
Park, K.,Kim, T.,Yu, Y.,Seo, K.,Kim, J. Elsevier [etc.] 2016 Journal of luminescence Vol.173 No.-
<P>Solid solubility limit of Ce3+ ions into Lu-based garnet, Lu3(1-x)Ce3xAl5O12, was determined as below 6.7 mol% (3x < 0.2 mol) through Raman spectra and X-ray diffraction patterns. Above the solid solubility limit (3x >= 0.2 mol), Lu3((1-x))Ce(3x)Al(5)O(12) phosphors showed the significant redshift to the yellow spectral region without Y3+ and Gd3+ ions. The redshift was explained in terms of the local compressive strain at the Ce3+ sites. The optimized sample (3x=0.4 mol) had a dominant emission wavelength of 548 nm, color coordinate of CIEx=0.421, CIEy=0.548, quantum efficiency of 80%, absorbance of 91%, lumen maintenance of 90% and high color stability at 473 K under 450 nm excitation wavelength, suggesting substitutability for the commercial yellow (Y, Gd)(3)(Al, Ga)(5)O-12:Ce3+ phosphor. The measured decay times at higher Ce3+ concentration are significantly shortened at higher temperature than that of those at lower Ce3+ concentration. The yellow Lu2.6Ce0.4Al5O12 and a commercial red (Sr, Ca)AlSiN3:Eu2+ phosphor were applied to the pc-WLED, it gave an excellent luminous efficiency (138 lm/W) with a slightly lower color rendering index (Ra =76.4) under correlated color temperature of 6500 K compared to those of the (Y, Gd)(3)(Al, Ga)(5)O-12:Ce3+-based one (136 lm/W, Ra =78.7). Especially, the quantities of the used phosphors were significantly decreased by 20% for the yellow LuAG:Ce and by 40% for the red (Sr, Ca)AlSiN3:Eu2+. Thus, the Y/Gd-free pure LuAG:Ce yellow phosphors can be used as alternative to the commercial yellow YAG:Ce phosphor. (C) 2016 Elsevier B.V. All rights reserved.</P>
김문석(M. S. Kim),유성초(S. C. Yu),임우영(W. Y. Lim),백종성(J. S. Baek) 한국자기학회 1992 韓國磁氣學會誌 Vol.2 No.3
Magnetic properties of grain aligned high Tc Y₁Ba₂Cu₃O_(7-y) superconductor are inverstigated. Grain-aligned superconductors have magnetic anisotropy in the Cu-O layer like single crystals. The lower critical field H_(c1). measured at the temperature range of 2 K up to 77 K, is found to be decreasing linearly as temperature goes up. Moreover, it decreaes more rapidly when the Cu-O layer is perpendicular to the external magnetic field. The temperature dependence of the magnetic susceptibility shows that the value of magnetic susceptibility, 4n X, is close to -1 at low temperature. The intra grain critical current density Jc, obtained from the Bean's critical state model, is found to be comparable to that of single crystal superconductors.