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Effective roles of native and Korean English teachers in the videoconferencing classrooms
Lee,Sangmin 한국초등영어교육학회 2010 초등영어교육 Vol.16 No.3
This paper reports on an investigation of teachers’ roles in videoconferencing classrooms. The videoconferencing program has been implemented in English classrooms since 2008 by the Ministry of Education, Science, and Technology to mitigate unequal access to English education between urban schools and countryside schools. This study analyzed 43 elementary school teachers’ videos and documents to examine co-teaching types in the videoconferencing classrooms. Among the random, non-focus group teachers, six expert teachers were selected to be role models during planning, in-class and after-class periods. For the analysis of the expert group (focus group), the Delphi method was conducted, and additional data were collected including questionnaires, interviews, workshops, and detailed lesson plans. The study revealed that there were clear differences between the focus group and the non-focus group regarding co-teachers’roles. The focus group teachers exhibited more effective and feasible co-teaching models, in which the native speaking teachers led the class and the Korean teachers supported and assisted. Particularly, the Korean teachers adapted flexible roles, shifting from facilitator to assistant to monitor, depending on the situations. The paper also includes suggestions for successful co-teaching in a videoconferencing classroom.
Nanomeniscus-induced delivery of liquid solutions for diverse nanofiber fabrication
An Sangmin,Kim Bongsu,Kwon Soyoung,Lee Kunyoung,Kim Jongwoo,안희준,제원호 나노기술연구협의회 2015 Nano Convergence Vol.2 No.13
Nanomaterial-delivery fabrication expects high-potential impacts on nanoscience, technology and industry, but still faces limited applicability mainly due to high-field requirement for liquid delivery, complicated intermediate processes, and narrow ink selectivity. Here, we demonstrates a simple, non-template, non-contact and electric field-free fabrication of diverse nanofibers. The process consists of continuous, meniscus-assisted delivery of liquid solutions through a nanoapertured nozzle in ambient conditions, followed by subsequent evaporation of liquid and aggregation of nanoparticle residues. For example, the carbon-nanotube nanofibers of 500 nm diameter exhibit a high shear modulus of ~1.5 GPa and current density up to 10 4 A/cm 2 . The results provide a unique, universal and versatile tool with wide selectivity in both ink and substrate.
비실시간 온라인 영어 수업에 대한 고등학교 학생과 교사의 인식 비교 연구
이상민 ( Lee¸ Sangmin ),정양수 ( Jung¸ Yang-soo ) 한국현대언어학회 2021 언어연구 Vol.37 No.2
The Journal of Studies in Language 37.2, 181-196. A Comparative Study on the Perceptions of Korean High School Students and Teachers about Asynchronous Online English Classes. The purpose of this study is to compare the perceptions of students and teachers about the current online English teaching and learning since the outbreak of COVID-19. For this study, questionnaires have been used for 513 students and 10 teachers of a girls’ high school located in “D” city, South Korea. The results are as follows: First, there were no significant differences in student and teacher perceptions depending on the subcategories of online English learning. Second, both groups showed the average level of satisfaction with online English classes. Third, both groups showed the necessity for encouraging interaction among class participants. Considering the results above, interaction among class participants should be encouraged by either implementing synchronous mode of class or any other way. This research was based solely on the asynchronous mode of online education with class video contents, so it was not able to comprise other varieties of online learning. (Chongchon High School · Chungnam National University)
Walking: The New Tool for Analyzing Museum Visitors
Sangmin Lee(Sangmin Lee) 한국아세아태평양교육문화융복합학회 2022 Asia Pacific Journal of Teaching and Learning Vol.2 No.2
Purpose This study aims to research walking as a new tool for visitor analysis in the museums. Method After literature review, multiple case study methodology with some components of duoethnographic arts-based research were employed for this research. The data, including walking videos, photo journals, and dialogues at several museums, were collected and analyzed qualitatively. Results Museum visitors' walking can be categorized in five types - browsing walking, relational walking, analytical walking, recreational walking, and virtual walking. Each type has one or two sub-categories to shed light on visitors' walking patterns. Conclusion Museum staffs and educators will be able to use walking analysis as supporting data for making decision on their program development, exhibition planning, and spatial arrangement to improve visitors' museum experience.
Tumor-Homing Glycol Chitosan-Based Optical/PET Dual Imaging Nanoprobe for Cancer Diagnosis
Lee, Sangmin,Kang, Sun-Woong,Ryu, Ju Hee,Na, Jin Hee,Lee, Dong-Eun,Han, Seung Jin,Kang, Choong Mo,Choe, Yearn Seong,Lee, Kyo Chul,Leary, James F.,Choi, Kuiwon,Lee, Kyung-Han,Kim, Kwangmeyung American Chemical Society 2014 Bioconjugate chemistry Vol.25 No.3
<P>Imaging techniques including computed tomography, magnetic resonance imaging, and positron emission tomography (PET) offer many potential benefits to diagnosis and treatment of cancers. Each method has its own strong and weak points. Therefore, multimodal imaging techniques have been highlighted as an alternative method for overcoming the limitations of each respective imaging method. In this study, we fabricated PET/optical activatable imaging probe based on glycol chitosan nanoparticles (CNPs) for multimodal imaging. To prepare the dual PET/optical probes based on CNPs, both <SUP>64</SUP>Cu radiolabeled DOTA complex and activatable matrix metalloproteinase (MMP)-sensitive peptide were chemically conjugated onto azide-functionalized CNPs via bio-orthogonal click chemistry, which was a reaction between azide group and dibenzyl cyclooctyne. The PET/optical activatable imaging probes were visualized by PET and optical imaging system. Biodistribution of probes and activity of MMP were successfully measured in tumor-bearing mice.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/bcches/2014/bcches.2014.25.issue-3/bc500020g/production/images/medium/bc-2014-00020g_0006.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/bc500020g'>ACS Electronic Supporting Info</A></P>
Lee, Si Yeon,Lee, Sangmin,Lee, Jangwook,Yhee, Ji Young,Yoon, Hwa In,Park, Soon-Jung,Koo, Heebeom,Moon, Sung-Hwan,Lee, Hyukjin,Cho, Yong Woo,Kang, Sun Woong,Lee, Sang-Yup,Kim, Kwangmeyung Elsevier 2016 Biochemical and biophysical research communication Vol.479 No.4
<P><B>Abstract</B></P> <P>Labeling of stem cells aims to distinguish transplanted cells from host cells, understand <I>in vivo</I> fate of transplanted cells, particularly important in stem cell therapy. Adipose-derived mesenchymal stem cells (ASCs) are considered as an emerging therapeutic option for tissue regeneration, but much remains to be understood regarding the <I>in vivo</I> evidence. In this study, a simple and efficient cell labeling method for labeling and tracking of stem cells was developed based on bio-orthogonal copper-free click chemistry, and it was applied in a mouse hindlimb ischemia model. The human ASCs were treated with tetra-acetylated <I>N</I>-azidoacetyl-<SMALL>D</SMALL>-mannosamine (Ac<SUB>4</SUB>ManNAz) to generate glycoprotein with unnatural azide groups on the cell surface, and the generated azide groups were fluorescently labeled by specific binding of dibenzylcyclooctyne-conjugated Cy5 (DBCO-Cy5). The safe and long-term labeling of the hASCs by this method was first investigated <I>in vitro</I>. Then the DBCO-Cy5-hASCs were transplanted into the hindlimb ischemia mice model, and we could monitor and track <I>in vivo</I> fate of the cells using optical imaging system. We could clearly observe the migration potent of the hASCs toward the ischemic lesion. This approach to design and tailor new method for labeling of stem cells may be useful to provide better understanding on the therapeutic effects of transplanted stem cells into the target diseases.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A new method was proposed for labeling and tracking of stem cells. </LI> <LI> This method enables safe and long-term monitoring of stem cells <I>in vivo</I>. </LI> <LI> We observed the migration of the stem cells toward the ischemic lesion. </LI> </UL> </P>
Lee, Dong-Eun,Na, Jin Hee,Lee, Sangmin,Kang, Choong Mo,Kim, Hun Nyun,Han, Seung Jin,Kim, Hyunjoon,Choe, Yearn Seong,Jung, Kyung-Ho,Lee, Kyo Chul,Choi, Kuiwon,Kwon, Ick Chan,Jeong, Seo Young,Lee, Kyung American Chemical Society 2013 MOLECULAR PHARMACEUTICS Vol.10 No.6
<P>An efficient and straightforward method for radiolabeling nanoparticles is urgently needed to understand the <I>in vivo</I> biodistribution of nanoparticles. Herein, we investigated a facile and highly efficient strategy to prepare radiolabeled glycol chitosan nanoparticles with <SUP>64</SUP>Cu via a strain-promoted azide–alkyne cycloaddition strategy, which is often referred to as click chemistry. First, the azide (N<SUB>3</SUB>) group, which allows for the preparation of radiolabeled nanoparticles by copper-free click chemistry, was incorporated to glycol chitosan nanoparticles (CNPs). Second, the strained cyclooctyne derivative, dibenzyl cyclooctyne (DBCO) conjugated with a 1,4,7,10-tetraazacyclododecane-1,4,7,10-tetraacetic acid (DOTA) chelator, was synthesized for preparing the preradiolabeled alkyne complex with <SUP>64</SUP>Cu radionuclide. Following incubation with the <SUP>64</SUP>Cu-radiolabeled DBCO complex (DBCO-PEG<SUB>4</SUB>-Lys-DOTA-<SUP>64</SUP>Cu with high specific activity, 18.5 GBq/μmol), the azide-functionalized CNPs were radiolabeled successfully with <SUP>64</SUP>Cu, with a high radiolabeling efficiency and a high radiolabeling yield (>98%). Importantly, the radiolabeling of CNPs by copper-free click chemistry was accomplished within 30 min, with great efficiency in aqueous conditions. In addition, we found that the <SUP>64</SUP>Cu-radiolabeled CNPs (<SUP>64</SUP>Cu-CNPs) did not show any significant effect on the physicochemical properties, such as size, zeta potential, or spherical morphology. After <SUP>64</SUP>Cu-CNPs were intravenously administered to tumor-bearing mice, the real-time, <I>in vivo</I> biodistribution and tumor-targeting ability of <SUP>64</SUP>Cu-CNPs were quantitatively evaluated by microPET images of tumor-bearing mice. These results demonstrate the benefit of copper-free click chemistry as a facile, preradiolabeling approach to conveniently radiolabel nanoparticles for evaluating the real-time <I>in vivo</I> biodistribution of nanoparticles.</P><P><B>Graphic Abstract</B> <IMG SRC='http://pubs.acs.org/appl/literatum/publisher/achs/journals/content/mpohbp/2013/mpohbp.2013.10.issue-6/mp300601r/production/images/medium/mp-2012-00601r_0006.gif'></P><P><A href='http://pubs.acs.org/doi/suppl/10.1021/mp300601r'>ACS Electronic Supporting Info</A></P>