사이버대학교의 수업 운영에 관한 질적 사례 연구

안희진 ( An¸ Heejin ),최성규 ( Choi¸ Seongkyu ),김정원 ( Kim¸ Jungwon ) 안암교육학회 2021 한국교육학연구 Vol.27 No.3

본 연구는 A사이버대학교에 근무하고 있는 수업조교의 활동을 통하여 온라인 수업 운영 모습을 드러내고, 특징을 도출하고자 한다. 이를 위해 수도권에 위치한 A사이버대학교에서 근무하고 있는 4명의 수업조교를 연구 참여자로 선정하여 참여관찰·심층면담·관련문서를 중심으로 질적 사례연구를 진행하였다. 연구결과 온라인 수업에서 수업조교의 활동은 크게 3가지로 구분된다. 업무 익히기에서는 ‘정신없는 학기초’, ‘업무 배우기’로 드러났다. 수업운영 보조로 ‘수업 모니터링’, ‘소통의 가교자’ 활동을 하는 것으로 나타났다. 좌충우돌하기에서는 ‘샌드위치 수업조교’, ‘갈등 해결하기’로 수업 운영 과정에서의 어려움과 해결 과정을 드러냈다. 이와 같은 수업조교 모습은 수업 보조자와 모호한 업무 적정선이라는 특징이 도출되었다. 이를 개선하기 위하여 수업조교 명칭 변화, 교수에게 역할 안내, 수업조교 업무 교육을 통하여 자연스럽게 조직문화가 개선될 수 있도록 해야 한다. 나아가 일반대학교에서의 온라인 교육에서도 학생 관리와 교수자의 온라인 교육 부담을 도와줄 인적·물적 자원과 교수자의 온라인 교육, 환경 구축이 필요하다. The purpose of this study is to reveal online class operations and derive characteristics through the activities of cyber university class assistants. To this end, four class assistants working at A Cyber U niversity located in the metropolitan area were selected as research participants and qualitative case studies were conducted focusing on participatory observations, in-depth interviews, and related documents. As a result of the study, the activities of class assistants in online classes are broadly divided into three categories. First, in the task mastery, it was revealed that ‘At the beginning of semesters with too much workload’ and ‘Work and learn at the same time’. Second, it was found that they were engaged in activities such as ‘Classroom monitoring’ and ‘Communication bridge’ to assist in class management. Lastly, in the left-to-right conflict, “Class assistant like a sandwich” and “Resolving Conflict” revealed difficulties and solutions in the course of operating the class. The characteristics of such class assistants were derived from the ambiguous line of work appropriate to the class assistants. In order to improve this, the organizational culture should be improved naturally by changing the name of the class assistants, guiding the instructors to the correct role of the class assistants, and job training for class assistants. Furthermore, in online education at general universities, it is necessary to provide human and material resources to help student the burden of online classes for instructors, to support online class operation education for instructors, and to establish an online education environment for universities.

Clinical utilization of radiation therapy in Korea between 2017 and 2019

Eunji Kim(Eunji Kim),Won Il Jang(Won Il Jang),Kwangmo Yang(Kwangmo Yang),Mi-Sook Kim(Mi-Sook Kim),Hyung Jun Yoo(Hyung Jun Yoo),Eun Kyung Paik(Eun Kyung Paik),Heejin Kim(Heejin Kim),Jaesun Yoon(Jaesun 대한방사선종양학회 2022 Radiation Oncology Journal Vol.40 No.4

Purpose: This study aimed to evaluate the clinical infrastructure and utilization of radiotherapy (RT) services in Korea between 2017 and 2019. Materials and Methods: We extracted the data of patients who underwent RT between 2017 and 2019 from the Health Insurance Review and Assessment Service. We further analyzed this data according to the diagnosis and treatment modalities of patients diagnosed with International Classification of Disease 10 (ICD-10) diagnostic codes C00–C97 and D00–D48. In addition, we collected statistics on RT facilities in Korea using a nationwide survey. Results: The total number of patients who received RT in 2017, 2018, and 2019 were 77,901, 81,849, and 87,460, respectively. The number of patients diagnosed with ICD 10 C- and D-codes in 2019 was 86,339, of whom 39,467 were men and 46,872 women. The rate of utilization of RT among cancer patients was 30.4% in 2017 and 2018 and 30.9% in 2019. In 2019, the most common types of cancers treated with RT were breast, lung, prostate, colorectal, and liver cancers. Regarding the RT infrastructure in Korea, there were 95 radiation oncology centers, 237 megavoltage (MV) teletherapy units, 35 brachytherapy units, and two proton accelerators in 2019. There were 4.5 MV teletherapy machines per million. Conclusion: The number of patients treated with RT has increased consistently from 2017 to 2019. As the number of patients with cancer increases, it is expected that the RT infrastructure will be further expanded in Korea.

Correlation between computed tomography imaging and histopathology in pleomorphic adenoma of parotid gland

Kim, Heejin,Kim, So Young,Kim, Yoon-Joong,Ko, Jae-mun,Park, Min Ji,Kim, Ji Hoon,Hah, J. Hun,Kwon, Tack-Kyun,Kim, Kwang Hyun,Sung, Myung-Whun Elsevier 2018 Auris, nasus, larynx Vol.45 No.4

<P><B>Abstract</B></P> <P><B>Objective</B></P> <P>The purpose of this study was to correlate the CT imaging features and histopathological findings of pleomorphic adenomas (PA), and also try to identify its clinical significance.</P> <P><B>Methods</B></P> <P>Totally 262 PAs in the parotid gland including 18 recurrent cases were retrospectively reviewed with preoperative CT and pathologic slides. Each pathologic slide was reviewed by two pathologists to calculate mean value of epithelial/mesenchymal component, and the results were correlated with features of CT scans.</P> <P><B>Results</B></P> <P>PAs showing high contrast enhancement were correlated with high proportion of epithelial components in histopathologic findings. PAs with smooth border tend to have high proportion of epithelial components. The margin on CT imaging did not consisted with pathologic margin of resected specimens. In recurrent PAs, there was a significant difference on CT contrast enhancement, not in proportion of epithelial component.</P> <P><B>Conclusion</B></P> <P>The histopathology and CT imaging features of PAs were variable, but we can find the correlation of epithelial component and CT contrast enhancement. Further large scale study would be expected to identify the clinical significance of CT imaging features and histopathologic findings of PAs.</P>

광열치료의 열 투여량에 따른 세포 자멸사에 대한 수치적 연구

김무중(Moojoong Kim),김관택(Gwantaek Kim),김동혁(Donghyuk Kim),이희진(Heejin Kim),유재석(Jaisuk Yoo),김동권(Dong-Kwon Kim),김현정(Hyun Jung Kim) 대한기계학회 2018 대한기계학회 춘추학술대회 Vol.2018 No.12

Photothermal therapy(PTT) is a therapy for selective ablation of the tumor by using a photothermal effect. However, in spite of using the photothermal effect, which is one of the fields of heat transfer, the research on heat transfer for photothermal therapy is insufficient. In photothermal therapy, GNPs (gold nanoparticles) are used as a photothermal enhancer to selective ablation of tumor. At this time, since the photothermal effect are different depending on the characteristics of the GNPs, and thermal and optical conditions of NIR laser, it is important to find an optimal condition suitable for selective ablation for effective photothermal therapy. In previous photothermal therapy studies, the temperature distribution in tumor tissues has been studied qualitatively. However, the correlation between the death of tumor tissue and thermal and optical conditions of NIR laser has not been quantitatively studied in terms of heat transfer. Therefore, in this study, the conditions (e.g. intensity, beam radius) of the lasers satisfying the apoptosis temperature (43℃ ~ 50℃ , which can effectively ablate tumors) were obtained for various sizes of tumor (width: 2mm ~ 10mm, depth: 0.5mm ~ 4.5mm) using numerical analysis. And quantitative analysis of the apoptosis rate of tumor tissue according to the thermal and optical conditions of photothermal therapy was performed.

Production of stearidonic acid-rich triacylglycerol via a two-step enzymatic esterification

Kim, Nam Ho,Kim, Heejin,Choi, Nakyung,Kim, Yangha,Kim, Byung Hee,Kim, In-Hwan Elsevier 2019 Food chemistry Vol.270 No.-

<P><B>Abstract</B></P> <P>The aim of this study was to synthesize stearidonic acid (SDA)-rich triacylglycerol (TAG) via a two-step lipase-catalyzed esterification under vacuum. SDA-rich fatty acid, which was prepared from echium oil via <I>Candida rugosa</I> lipase-catalyzed selective esterification, was used as the substrate. Two different immobilized lipases, Novozym 435 from <I>Candida antarctica</I> and Lipozyme TL IM from <I>Thermomyces lanuginosus</I>, were employed for the synthesis of SDA-rich TAG. In the first step, Novozym 435-catalyzed esterification of the SDA-rich fatty acid with glycerol was carried out for 2 h. In the second step, Lipozyme TL IM-catalyzed esterification of the reaction mixture from the first step was performed for an additional 10 h. The optimal reaction conditions for the second step were a temperature of 65 °C, an enzyme loading of 20%, and a vacuum of 0.7 kPa. Consequently, the maximum TAG conversion of ca. 86.4 wt% was obtained after 12 h via a two-step lipase-catalyzed esterification.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Stearidonic acid-rich triacylglycerol was successfully synthesized. </LI> <LI> A two-step enzymatic esterification was carried out under vacuum. </LI> <LI> Novozym 435 from <I>Candida antarctica</I> was used for the first step reaction. </LI> <LI> Lipozyme TL IM from <I>Thermomyces lanuginosus</I> was used for the second step. </LI> </UL> </P>

Preparation of High Purity Δ5-Olefinic Acids from Pine Nut Oil via Repeated Lipase-Catalyzed Esterification

Kim, Heejin,Choi, Nakyung,Kim, Hak-Ryul,Lee, Junsoo,Kim, In-Hwan JAPAN OIL CHEMISTS SOCIETY 2018 Journal of oleo science Vol.67 No.11

Effects of pesticide exposure on task gene expression level and nursing behavior in nurse bees of honey bee, Apis mellifera

HeeJin Kim,YeongHo Kim,Young Ho Kim 한국응용곤충학회 2023 한국응용곤충학회 학술대회논문집 Vol.2023 No.10

The adult of honey bee, Apis mellifera, performs an age-dependent division of labor with nurse bees and foragers. Foragers fly outside the hive to collect pollen and nectar, while nurses feed and care for the larvae and queen inside the hive. Foragers are considered to be frequently exposed to agrochemicals, although nurses, stayed inside the hive, are potentially exposed to pesticides through application of miticides and pesticidecontaminated food provided by forager. Therefore, physiological effects of pesticides to nurses should be elucidated to understand the adverse effects of the chemicals on entire honey bee colony. In this study, we investigated the expression changes of the genes associated with labor division (task genes) and the nursing behavior of nurse bees fed four pesticides: acetamiprid (ACE), carbaryl (CB), imidacloprid (IMI), and fenitrothion (FEN). When nurses were exposed to ACE, IMI, and FEN, expression levels of task genes were up- and down-regulated, and their nursing behaviors were also suppressed and enhanced, respectively. CB did not alter the gene expression levels, however increased nursing behavior. These suggest the potential of pesticide that breaks the balance of labor distribution in honey bee colony.

Synthesis of α-linolenic acid-rich triacylglycerol using a newly prepared immobilized lipase

Kim, Heejin,Choi, Nakyung,Oh, Se-Wook,Kim, Yangha,Hee Kim, Byung,Kim, In-Hwan Elsevier 2017 Food chemistry Vol.237 No.-

<P><B>Abstract</B></P> <P>An α-linolenic acid (ALA)-rich triacylglycerol (TAG) was synthesized from an ALA-rich fatty acid (FA) from perilla oil and glycerol, using a newly prepared immobilized lipase under vacuum. The ALA-rich FA (purity >90wt%) used as the substrate was prepared by urea complexation from perilla oil FAs. Liquid Lipozyme TL 100L lipase from <I>Thermomyces lanuginosus</I> was used for immobilization. Nine different hydrophilic and hydrophobic carriers for immobilization were tested, and Duolite A568, which is a hydrophilic resin, was selected as the best carrier. This immobilized lipase was used to synthesize TAG by direct esterification under vacuum. The parameters investigated were temperature, enzyme loading, and vacuum level. The optimum reaction conditions were a temperature of 60°C, an enzyme loading of 15% (based on the total weight of the substrate), and a vacuum of 0.7kPa, respectively. The maximum conversion to TAG of ca. 88wt% was obtained in 12h under the optimum conditions.</P> <P><B>Highlights</B></P> <P> <UL> <LI> α-Linolenic acid-rich triacylglycerol was successfully synthesized. </LI> <LI> A newly immobilized lipase was employed as the biocatalyst. </LI> <LI> Enzyme employed for immobilization was liquid Lipozyme TL 100L. </LI> <LI> Duolite A568 was used as carrier. </LI> </UL> </P>

Morphology Control of Bi₂S₃ Nanostructures and the Formation Mechanism

Kim, HeeJin,Park, Ji‐,eun,Kim, Kyung,Han, Mi‐,Kyung,Kim, Sung‐,Jin,Lee, Wooyoung WILEY‐VCH Verlag 2013 Chinese journal of chemistry Vol.31 No.6

<P><B>Abstract</B></P><P>Bismuthinite (Bi<SUB>2</SUB>S<SUB>3</SUB>) nanostructures were prepared by a hydrothermal method with sodium ethylenediaminetetraacetate (EDTA‐Na<SUB>2</SUB>). The morphology of Bi<SUB>2</SUB>S<SUB>3</SUB> nanostructures was changed from a nanorod to a nanoplate by presence of the EDTA‐Na<SUB>2</SUB>. The altered morphology was caused by the capping effect of EDTA‐Na<SUB>2</SUB> with Bi<SUP>3+</SUP> ions, which induces the suboptimal growth direction due to partially blocking the preferential orientation direction. When the EDTA‐Na<SUB>2</SUB>/Bi<SUP>3+</SUP> molar ratio=1, the growth of Bi<SUB>2</SUB>S<SUB>3</SUB> nanostructures was not allowed due to the chelating effect of EDTA‐Na<SUB>2</SUB>. The obtained Bi<SUB>2</SUB>S<SUB>3</SUB> nanorods, stacked nanorods, nanoplates and nanoparticles were characterized using X‐ray diffraction (XRD), transmission electron microscopy (TEM), high‐resolution transmission electron microscopy (HRTEM) and selected area electron diffraction (SAED) pattern. A possible formation mechanism of these morphologies was proposed. The successful synthesis of various morphologies of nanostructured Bi<SUB>2</SUB>S<SUB>3</SUB> may open up new possibilities for thermoelectric, electronic and optoelectronic uses of nanodevices based on Bi<SUB>2</SUB>S<SUB>3</SUB> nanostructure.</P>

Extraction of Oily Compound From Bitter Melon (Momordica charantia) Seed with N-hexane and Analysis of Fatty Acid Composition and Phytochemicals

Heejin Kim,Oh-Taek Kwon,Shinae Kim,Dong-Bin Lim,Jun-Bae Kim,Sang-Kyu Kim,Soon-Ki Hong 한국식품영양과학회 2020 한국식품영양과학회 학술대회발표집 Vol.2020 No.10