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Yunju Lee(Yunju Lee) J-INSTITUTE 2022 Public Value Vol.7 No.2
Purpose: The purpose of this study is to not only explore, in regards to the international students studying in Korea, the influence of external motivation for studying abroad on the academic adjustment and the educational satisfaction, but also the infrastructure services, which are currently various external motivations for the inter-national students at each university, thereby preparing the basic data needed to build the customized practical cases appropriate for the future society. Method: In this study, from November 2019 to January 2020, 450 international students enrolled at universi-ties in Daegu and Gyeongbuk were surveyed, and the cluster sampling method was used, and the survey was conducted using the self-administration method. Among the collected questionnaires, 322 questionnaires were used as a valid sample, excluding the data in which the responses were insincere or some of the contents of the survey were omitted, and a questionnaire was conducted on the external motivation, academic adjustment, and educational satisfaction among the international students. For the data processing of the study, using the SPSS 23.0, frequency analysis, Cronbach's α coefficient calculation, factor analysis, correlation analysis, and the mul-tiple regression depending on the purpose of data analysis were used. Results: As a result of the factor analysis and reliability test for external motivation in factor analysis and reliability test, the eigenvalue and reliability of the factor turned out to be 2.873(α=.832) and 2.801(α=.806), and the academic adjustment turned out to be an adjustment factor of 2.942(α=.825), educational satisfaction turned out to be a facility/administrative factor of 2.531(α=.776), and a teaching/class factor of 2.149(α=.766). Overall, it turned out that the external motivation affects the academic adjustment and the educational satisfaction. Conclusion: It is significant in that it examines the correlations between 'motivation to study abroad', 'study adaptation', and 'educational satisfaction' of the international students from the perspective of transnationalism which leads to 'study-employment-immigration'. Accordingly, in order for the international students to adapt to their studies and satisfy their education, the infrastructure services, which are motives outside of studying abroad, must be strengthened.
Kim, Yunju,Sim, Sung Hoon,Park, Boram,Lee, Keun Seok,Chae, In Hye,Park, In Hae,Kwon, Youngmi,Jung, So-Youn,Lee, Seeyoun,Ko, Kyounglan,Kang, Han-Sung,Lee, Chan Wha,Lee, Eun Sook Elsevier 2018 Clinical breast cancer Vol.18 No.6
<P><B>Abstract</B></P> <P><B>Purpose</B></P> <P>To investigate the diagnostic performance of magnetic resonance imaging (MRI) for predicting pathologic complete response after neoadjuvant chemotherapy (NAC) depending on subtypes of breast cancer using different interpretation thresholds of MRI negativity.</P> <P><B>Patients and Methods</B></P> <P>A total of 353 women with breast cancer who had undergone NAC were included. Pathologic examination after complete surgical excision was the reference standard. Tumors were divided into 4 subtypes on the basis of expression of hormone receptor (HR) and human epidermal growth factor receptor 2 (HER2). Tumor enhancement was assessed on early and late phases of MRI. MRI negativity was divided into radiologic complete response (rCR, complete absence of enhancement on both early and late phases) and near-rCR (no discernible early enhancement but observed late enhancement).</P> <P><B>Results</B></P> <P>Ninety (25.5%) of 353 patients experienced pathologic complete response. When analyzing the data of all patients, sensitivity of MRI was higher for rCR versus near-rCR (97.72% vs. 90.49%, <I>P</I> < .0001), whereas specificity was lower for rCR versus near-rCR (44.44% vs. 72.22%, <I>P</I> < .0001). Accuracy was equivalent (84.14% vs. 85.84%). In HR−HER2<SUP>+</SUP> tumors, 100% sensitivity and negative predictive value were achieved by assessing early enhancement only. In HR<SUP>+</SUP>HER2− tumors, sensitivity of MRI was higher for rCR versus near-rCR (96.12% vs. 86.82%, <I>P</I> = .0005).</P> <P><B>Conclusion</B></P> <P>Diagnostic performance of MRI after NAC differs in accordance with the subtypes and threshold of MRI negativity. MRI assessment with consideration of tumor subtypes is required, along with standardization of MRI interpretation criteria in the NAC setting.</P>
Polysulfide rejection layer from alpha-lipoic acid for high performance lithium-sulfur battery
Song, Jongchan,Noh, Hyungjun,Lee, Hongkyung,Lee, Je-Nam,Lee, Dong Jin,Lee, Yunju,Kim, Chul Hwan,Lee, Yong Min,Park, Jung-Ki,Kim, Hee-Tak The Royal Society of Chemistry 2015 Journal of Materials Chemistry A Vol.3 No.1
<P>The polysulfide shuttle has been an impediment to the development of lithium-sulfur batteries with high capacity and cycling stability. Here, we report a new strategy to remedy the problem that uses alpha-lipoic acid (ALA) as an electrolyte additive to form a polysulfide rejection layer on the cathode surface<I>via</I>the electrochemical and chemical polymerization of ALA and a stable solid electrolyte interface (SEI) layer on the Li metal anode during the first discharge. The poly(ALA) layer formed<I>in situ</I>effectively prevents the polysulfide shuttle and consequently enhances the discharge capacity and cycling stability, owing to the Donnan potential developed between the polysulfide-concentrated cathode and the fixed negative charge-concentrated poly(ALA) layer. Also, the SEI layer additionally prevents the chemical reaction of the polysulfide and Li metal anode. The approach, based on the double effect, encompasses a new scientific strategy and provides a practical methodology for high performance lithium-sulfur batteries.</P>
고성능 리튬 설퍼 전지 구현을 위한 폴리설파이드 억제막
( Hee-tak Kim ),( Jongchan Song ),( Hyungjun Noh ),( Hongkyung Lee ),( Je-nam Lee ),( Dong Jin Lee ),( Yunju Lee ),( Chul Hwan Kim ),( Yong Min Lee ),( Jung-ki Park ) 한국공업화학회 2015 한국공업화학회 연구논문 초록집 Vol.2015 No.1
The polysulfide shuttle has been an impediment to the development of lithium-sulfur batteries with high capacity and cycling stability. Here, we report a new strategy to remedy the problem that uses alpha-lipoic acid (ALA), as an electrolyte additive to form a polysulfide rejection layer on the cathode surface via the electrochemical and chemical polymerization of ALA during the first discharge. The poly(ALA) layer formed in situ effectively prevents the polysulfide shuttle and consequently enhances the discharge capacity and cycling stability, owing to the Donnan potential developed between the polysulfide-concentrated cathode and the fixed negative charge-concentrated poly(ALA) layer. The approach, based on a thermodynamic equilibrium and a natural material, encompasses a new scientific strategy and provides a practical methodology for high performance lithium-sulfur batteries.
Efficient adsorption of sulfide gas using porous zeolite powder
Lee Sang-hwa,Jeon Young Pyo,Lee Young Jun,La Yunju,Song Jun Yong,Park Yong Yeol,Lee Eun Jung,Jeon Ok Sung,Park Sang Yoon,Yoo Young Joon,Yang Keun-Hyeok 한국물리학회 2021 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.79 No.12
We prepared zeolite 13× beads and 10% zeolite 13× bead-embedded water-permeable blocks using porous zeolite powder. The difference in the surface state and pore structure of the zeolite powder and bead was analyzed through scanning electron microscopy and Brunauer–Emmett–Teller measurements. The process for making zeolite beads partially damaged their surface. Furthermore, the pore structure of the zeolite beads changed from micropores to a mixture of micro- and mesopores. The sulfur oxide ( SOx) adsorption efficiency of zeolite powder, beads, and blocks was evaluated. The initial SOx adsorption efficiency of zeolite beads decreased after washing ten times, but the increase in SOx concentration after initial adsorption was very small. The SOx adsorption efficiency of the block was very high even after washing ten times. These results indicate that the block is promising for applications requiring the adsorption of harmful gases such as SOx and NOx.
Lee, Sun-Young,Choi, Yunju,Hong, Kyong-Soo,Lee, Jung Kyoo,Kim, Ju-Young,Bae, Jong-Seong,Jeong, Euh Duck Elsevier 2018 APPLIED SURFACE SCIENCE - Vol.447 No.-
<P><B>Abstract</B></P> <P>The crucial roles of ethylenediaminetetraacetic acid (EDTA) in the poly(acrylic acid) (PAA)-binder system were investigated for the high electrochemical performance silicon anode in lithium-ion batteries. The EDTA supports the construction of a mechanically robust network through the formation of sbndCOOH linkage with the SiO<SUB>2</SUB> layer of the Si nanoparticles. The mixture of the PAA/EDTA binder and the conductive agent exhibited an improved elastic modulus and peeling strength. The creation of hydrogen fluoride (HF) was effectively suppressed through the elimination of the H<SUB>2</SUB>O. An H<SUB>2</SUB>O–phosphorous pentafluoride (PF<SUB>5</SUB>) reaction, which is known for its use in the etching of metal oxides including its creation of the solid electrolyte interphase (SEI) layer, generates the HF. A remarkably sound cyclability with a discharge capacity of 2540 mA h g<SUP>−1</SUP> was achieved as a result of the synergistic effect between robust mechanical properties and suppression of the HF creation for the stability of the SEI layer.</P> <P><B>Highlights</B></P> <P> <UL> <LI> EDTA was introduced into PAA to suppress the HF creation. </LI> <LI> PAA/EDTA binder derived an exceptional cycling performance. </LI> <LI> Si-PAA/EDTA electrode showed good thermal stability after temperature storage. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
A Qualitative Study on Secretaries’ Informal Learning in the Workplace
Lee Yunju(이윤주),Paek Jeeyon(백지연) 한국비서학회 2011 비서·사무경영연구 Vol.20 No.1
본 연구는 비서들의 일터에서의 무형식 학습이 어떤 모습으로 일어나는지 그 발생 형태를 살펴보고, 학습에 있어서 촉진 요인이 무엇인지, 학습의 결과로서 얻어지는 지식, 기술, 태도 등에는 무엇이 있는지를 도출함으로써 비서들의 일터에서의 무형식 학습에 대한 기초 자료를 제공하는데 그 목적이 있다. 본 연구의 연구문제는 다음과 같다. 첫째, 일터에서의 비서들은 어떻게 무형식적으로 학습하는가? 둘째, 비서들의 일터에서의 무형식 학습을 촉진시키는 조직 맥락적 요인은 무엇인가? 셋째, 비서들은 일터에서의 무형식 학습을 통해 무엇을 학습하는가? 25명의 비서들을 대상으로 중요사건기법을 사용한 일대일, 대면인터뷰를 통해 자료를 수집하였다. 연구 결과, 무형식 학습이 일어나는 49개의 업무 활동이 발견되었고, 이들을 대표하는 19개의 업무 활동이 도출되었다. 비서들의 일터에서의 무형식 학습을 촉진시키는 조직 맥락적 요인으로는 크게 상사의 영향, 조직의 영향, 비서 업무의 영향 등 세 영역에서의 요인들이 도출되었다. 일터에서의 무형식 학습의 결과로는 지식, 기술, 능력, 그 외 특성 등 네 영역에서의 결과가 도출되었다. 본 연구는 그동안 연구가 미비하였던 비서들의 일터에서의 무형식 학습에 주목하여 해당 영역의 연구에 기초 토대를 마련했다는 점에서 의의를 가지며, 향후 연구자들은 이를 바탕으로 다양한 양적 연구를 수행할 수 있으리라 기대된다. The purpose of this research is to examine the work activities where secretaries’ informal learning occurs, the contextual factors that facilitate their learning and the perceived learning outcomes of informal workplace learning for the secretaries. For this qualitative research, in-depth interviews utilizing Critical Incident Technique (CIT) were conducted with 25 secretaries. The findings revealed that the majority of the interview participants (23 secretaries) have experienced informal workplace learning through the following work activities: Observation of the boss, reviewing of business documents, and casual conversation with co-workers at unofficial occasions. Based on the findings that were identified in this study, future researchers may extend the understanding of the issues related to the secretaries’ informal workplace learning.