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Shin, Hae-Young,Lee, Jaeyeon,Lee, Yumin,Jeong, Sewon,Jung, Hayoung,Yu, Hak Ki,Baik, Jeong Min,Kim, Myung Hwa,Yoon, Seokhyun American Chemical Society 2014 The Journal of Physical Chemistry Part C Vol.118 No.35
<P>Polarized Raman scattering measurements have been carefully employed to explore the growth orientation and direction of a highly single crystalline twinned V-shaped ruthenium dioxide nanowire which were directly grown on a Si wafer with the thin SiO<SUB>2</SUB> layer at 750 °C without any catalyst via a vapor phase transport process. Interestingly, the morphology of most of nanowires represents a well-defined twinned V-shape with a specific angle of approximately 52° between the two branches under a specific growth condition. We measured polarized Raman spectra of a single V-shaped nanowire and calculated the Raman intensity of RuO<SUB>2</SUB> nanowire by considering a crystal coordinate. We observed that each branch of a V-shaped RuO<SUB>2</SUB> nanowire grows into [001] direction, exactly consistent with the prediction of the growth direction by high resolution transmission electron microscopy (HRTEM).</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/jpccck/2014/jpccck.2014.118.issue-35/jp5069208/production/images/medium/jp-2014-069208_0007.gif'></P>
Electrical Characterization of Ultrathin Film Electrolytes for Micro-SOFCs
Shin, Eui-Chol,Ahn, Pyung-An,Jo, Jung-Mo,Noh, Ho-Sung,Hwang, Jaeyeon,Lee, Jong-Ho,Son, Ji-Won,Lee, Jong-Sook The Korean Ceramic Society 2012 한국세라믹학회지 Vol.49 No.5
The reliability of solid oxide fuel cells (SOFCs) particularly depends on the high quality of solid oxide electrolytes. The application of thinner electrolytes and multi electrolyte layers requires a more reliable characterization method. Most of the investigations on thin film solid electrolytes have been made for the parallel transport along the interface, which is not however directly related to the fuel cell performance of those electrolytes. In this work an array of ion-blocking metallic Ti/Au microelectrodes with about a $160{\mu}m$ diameter was applied on top of an ultrathin ($1{\mu}m$) yttria-stabilized-zirconia/gadolinium-doped-ceria (YSZ/GDC) heterolayer solid electrolyte in a micro-SOFC prepared by PLD as well as an 8-${\mu}m$ thick YSZ layer by screen printing, to study the transport characteristics in the perpendicular direction relevant for fuel cell operation. While the capacitance variation in the electrode area supported the working principle of the measurement technique, other local variations could be related to the quality of the electrolyte layers and deposited electrode points. While the small electrode size and low temperature measurements increaseed the electrolyte resistances enough for the reliable estimation, the impedance spectra appeared to consist of only a large electrode polarization. Modulus representation distinguished two high frequency responses with resistance magnitude differing by orders of magnitude, which can be ascribed to the gadolinium-doped ceria buffer electrolyte layer with a 200 nm thickness and yttria-stabilized zirconia layer of about $1{\mu}m$. The major impedance response was attributed to the resistance due to electron hole conduction in GDC due to the ion-blocking top electrodes with activation energy of 0.7 eV. The respective conductivity values were obtained by model analysis using empirical Havriliak-Negami elements and by temperature adjustments with respect to the conductivity of the YSZ layers.
Transcatheter Arterial Embolization for Palliation of Uterine Body Cancer Bleeding
Jaeyeon Choi,Ji Hoon Shin,Hee Ho Chu 대한영상의학회 2023 대한영상의학회지 Vol.84 No.3
Purpose This study aimed to evaluate the efficacy and safety of transcatheter arterial embolization (TAE) for bleeding due to uterine body cancer. Materials and Methods In this retrospective study, six patients with varying types of uterine body cancer who underwent TAE for bleeding control were investigated. Angiographic findings, cross-sectional images, TAE details, and clinical outcomes were studied. Technical and clinical success rates were calculated. Results The identified patients had endometrioid adenocarcinoma, sarcoma, and gestational trophoblastic neoplasia, and most were patients with advanced-stage cancer. In four patients, tumor bleeding presented as vaginal bleeding. Technical success was achieved in all seven TAE procedures in six patients. Two patients with recurrent masses who had undergone hysterectomy presented with hematochezia, and TAE was able to provide technical success in these patients as well. The clinical success rate was 50%, indicating bleeding control for > 1 week. Rebleeding was directly associated with death in one patient. On the following day, mild fever was observed in one patient. Conclusion TAE can be considered an effective and safe method of bleeding control for uterine body cancer, especially during critical periods throughout the disease course of patients with inoperable, advanced-stage cancer.
A cell-repellent sulfonated PEG comb-like polymer for highly resolved cell micropatterns
Jung, Jaeyeon,Na, Kyunga,Shin, Byungcheol,Kim, Okgene,Lee, Jonghwan,Yun, Kyusik,Hyun, Jinho Informa UK (TaylorFrancis) 2008 Journal of biomaterials science, Polymer edition Vol.19 No.2
<P>This paper investigates the chemical modification of a cell-repellent poly(ethylene glycol) (PEG)-based polymer to enhance its hydrophilicity with sulfonate groups, and its application in the fabrication of a cell microarray. First, a polymer comprised of a methyl methacrylate (MMA) backbone with PEG side-chains (PMMA-b-PEG) was synthesized from three monomers by radical polymerization and purified. Despite the hydrophilic side-groups in the amphiphilic polymer, the backbone structure's hydrophobicity allows for local adsorption of biomolecules in incubation media with or without serum. To enhance the hydrophilicity of the polymer, we tethered sulfonate groups to the hydroxyl groups on the PEG side chains (PMMA-b-PEG-SO3). The sulfate groups' physical and mechanical movement competitively repels biomolecules approaching the PMMA-b-PEG surface. Polymers modified with sulfonate were characterized by contact angle measurement, FT-IR, NMR, AFM and GPC. PMMA-b-PEG and PMMA-b-PEG-SO3 were successfully micropatterned on polystyrene and glass surfaces, and cell attachment was performed in either serum-free or serum-containing media, resulting in highly resolved cell micropatterns.</P>
유재연,이준석,신현기,전병운,고등영 국립특수교육원 2005 특수교육연구 Vol.12 No.2
이 연구는 초등학생용 적응행동 평가도구의 표준화를 위한 문항 타당도의 검토를 목적으로 한다. 연구의 대상은 서울, 경기, 대전, 충남 지역 7세에서 12세의 초등학생 699명으로 실시되었다. 연구의 결과에 의하면 문항의 난이도에서 기본지식(개념) 영역과 작업기술 영역이 상대적으로 어려운 것으로 나타났다. 문항의 변별도와 관련한 집단간 빈도차이의 검사를 실시한 결과는 모두 통계적으로 유의하여 집단간 차이를 잘 변별하는 것으로 나타났다. 반분신뢰도는 .68~.97사이에 분포하였으며, Cronbach의 α계수에 의한 문항내적일치도는 67~.96 사이에 분포하였다. AMOS를 이용한 단일요인 모형과 3요인 모형에 대한 검증에 따르면 단일요인에 비하여 3요인 구조모형이 적합도 차이에서 양호한 모형으로 나타났다. 평균점수와 관련하여 10세와 11세(대체로 4학년과 5학년 사이)의 평균차이가 다른 연령대에 비하여 상대적으로 적은 것으로 나타났으며 이에 대한 보다 심층적인 연구가 뒷받침 되어야 할 필요가 있다. The purpose of this research was to conduct psychometric analysis of a adaptive behavior assessment instrument, being developed to identify overall levels of adaptive behaviors and characteristics of elementary school children. The target population for the study are 699 children with the age distribution of 7 to 12 from elementary school which located in Seoul, Daejeon, Choongnam, Kyunggi. As the results of the data analysis, Primary knowledge(concept of knowledge) and vocational skill subdomains are different relatively. Explorations of item discrimination yielded evidence of content validity. That means these items well organized by groups. The half-spilt reliability was between .68 and .97. Cronbach α was between .67 and .96. Exploratory factor analysis of subscale variables produces one factor solution. AMOS 5 was used for confirmatory factor analysis of subscale variables produces one factor solution AMOS 5 was used for confirmatory factor analysis. Followed AMOS three model was less parsimonious than one factor model, but the former was more fitted than the latter.