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이은상(Lee Eunsang) 학습자중심교과교육학회 2021 학습자중심교과교육연구 Vol.21 No.4
2020년 1학기, 우리나라는 코로나 19로 인해 각 학교급에서는 전면적인 온라인 수업 실시라는 초유의 사태를 경험하였다. 이에 많은 교수자가 온라인 수업 상황에 적응하지 못해 어려움을 겪었다. 특히 실습 활동이 주가 되는 교과의 경우, 온라인 상황에서 실습수업 자체가 이루어지기 어렵다는 점에서 타 교과보다 더 큰 어려움을 겪었다. 이러한 배경에는 온라인 상황에서 실습수업 사례가 많이 개발되지 않았기 때문이다. 이에 이 연구에서는 온라인 수업 기반 아두이노 자동차 만들기 교수학습자료를 개발하여 그 사례를 제시하고자 하였다. 이 연구에서는 Lee(2020b)의 저비용 마이크로컨트롤러 기반 교수학습 모형에 따라 아두이노 자동차의 차체를 개발하였고, 이 차체를 작동시키는 소스 코드를 제안하였다. 본 연구에서 제시한 교수학습자료의 개발 과정과 개발 결과물은 온라인상에서 실습수업을 진행하고자 하는 교수자들에게 유용한 참고 자료로 활용될 수 있을 것이다. During the first semester of 2020, Korea experienced an unprecedented situation where all schools were forced to conduct classes online due to Covid-19. As a result, many instructors had difficulty adapting to teaching classes online. Particularly, cases where the subjects were primarily taught using hands-on activities were more challenging than other subjects because it was difficult to conduct these classes in an entirely online situation. This is because there are few examples of hands-on lessons developed for use in online situations. Therefore, this study attempted to present an example by developing teaching and learning materials for “making Arduino car” based on online classes. In this study, an Arduino car’s body was developed according to Lee’s (2020b) low-cost microcontroller-based teaching and learning model. The proposed source code was used to operate the body. The development process and results of the teaching and learning materials presented in this study can be used as useful reference materials for instructors who want to conduct hands-on classes online.
Modeling of Energetic Neutral Atom (ENA) Emissions During a Magnetic Storm for CINEMA/TRIO
이은상,권혁진,박종선,선종호,진호,김관혁,이동훈,Lee, Ensang,Kwon, Hyuk-Jin,Park, Jong-Sun,Seon, Jongho,Jin, Ho,Kim, Khan-Hyuk,Lee, Dong-Hun,Wang, Linghua,Lin, Robert P.,Parks, George K.,Sample, John,Roelof, Edward C. 한국천문학회 2012 天文學會報 Vol.37 No.2
Energetic neutral atoms (ENAs) are emitted by charge exchange collisions between energetic ions and cold neutral atoms. ENAs can be used as an alternative measure of the energetic ions in the source region because they maintain the energy and pitch angle of the source energetic ions. In the present study we present simulation results of the ENA emissions during a magnetic storm to be measured by the STEIN instrument onboard the CINEMA/TRIO satellites. The CINEMA/TRIO mission consists of three identical cubesats with low-altitude orbits. The STEIN instrument onboard each cubesat can measure ENAs with energies from ~4 keV to ~20 keV as well as suprathermal electrons and ions. The measurement of ENA emissions from ring current by STEIN is simulated using the models for energetic ring current ions and geocoronal neutral atoms. Especially we will discuss about the energy spectrum of the ENAs and the effect of transient variations of the ring current.
적절한 정맥 재혈류 시점의 판단을 위한 조직산소분압의 유효성
이은상,정종필,박승하,이병일,Lee, Eun-Sang,Choung, Jong-Pil,Park, Seung-Ha,Lee, Byung-Il 대한성형외과학회 2010 Archives of Plastic Surgery Vol.37 No.5
Purpose: The purpose of this study is to delineate the optimal time of venous revascularization for preventing the flap necrosis due to venous occlusion, and to clarify the usefulness of tissue oxygen pressure ($TcpO_2$) in the determination of the point of time for venous revascularization. Methods: Thirty-six, $3{\times}3\;cm$ sized epigastric island flap was elevated in left abdomen of male Sprague-Dawley rat weighing 250 gram. Flaps were randomly assigned to six groups of six flaps according to the duration of venous occlusion with microvascular clamp; 10 minutes in the group I as the control, 60 minutes in the group II, 2 hours in the group III, 3 hours in the group IV, 4 hours in the group V, and 6 hours in the group VI, respectively. Just before removal of clamp after flap was reposed in situ, the ratio of $TcpO_2$ (tissue oxygen pressure) of the island flap to that of right abdomen was calculated in each group, and tissue specimen was harvested from the distal area of the flap for histological evaluation of vascular change. Five days later, survival area of the flap was estimated, and evaluated the correlation between the tissue oxygen pressure and the rate of flap survival. Results: The $TcpO_2$ and the survival rate of flap were decreased proportionally with the duration of venous occlusion. The ratio of the $TcpO_2$ of the flap is decreased abruptly to below sixty percentile compared to the $TcpO_2$ of normal tissue, and the survived area of the flap is decreased to nine-tenth of the designed size after three hours of total venous occlusion. Histologically, the number of congested vessels was increased according to venous occluded time, and proportionally increased after 3-hours of occlusion significantly. Conclusion: There is a close correlation between the $TcpO_2$ and the survival rate of flaps according to the duration of venous occlusion. Therefore, the $TcpO_2$ represents the hemodynamic changes within the flap, and thought to be an alternative effective tool in the flap monitoring for venous revascularization.
복수로 발현된 비 IgE 매개성 호산구성 위장관염 1예
이은상,김미진,하상윤,이유민,최경은,최연호,Yi, Eun-Sang,Kim, Mi-Jin,Ha, Sang-Yun,Lee, Yoo-Min,Choi, Kyong-Eun,Choe, Yon-Ho 대한소아소화기영양학회 2011 Pediatric gastroenterology, hepatology & nutrition Vol.14 No.2
저자들은 구토, 설사와 같은 비특이적인 증상과 복수가 발생한 13세 남아에서 말초혈액의 호산구 증가 소견이 있고 IgE는 정상범위이며, 내시경 생검상 식도, 소장, 대장 및 직장에서 특징적인 호산구 침윤 소견이 관찰되어 비 IgE 매개성 호산구성 위장관염으로 진단된 1예를 경험하였으며 스테로이드 투여로 증상 호전을 보였기에 문헌고찰과 함께 보고하는 바이다. Eosinophilic gastroenteritis is a rare disease occurring especially in children, and shows various nonspecific presentations with infiltration of eosinophils in the gastrointestinal organs. The pathophysiology of eosinophilic gastroenteritis is not yet clearly known, but allergic reactions are suspected to be related with the disease. Eosinophilic gastroenteritis is categorized into the mucosal, muscularis and subserosal types based on which layer of the intestinal wall is involved. There are different clinical manifestations according to the involved layer. Most cases to date have responded well to steroid therapy. In this study, we diagnosed and treated a case of non-IgE-mediated, subserosal eosinophilic gastroenteritis in a child with abdominal pain, diarrhea and ascites.
창상치유목적의 골수기질세포 동종이식을 위한 고분자막의 조건
이은상,김명주,한승규,홍성택,김우경,Lee, Eun-Sang,Kim, Myeong-Joo,Han, Seung-Kyu,Hong, Sung-Taek,Kim, Woo-Kyung 대한성형외과학회 2010 Archives of Plastic Surgery Vol.37 No.5
Purpose: Major drawbacks of conventional bone marrow stromal cells (BSCs) transplantation method are mainly caused by direct transplanted cell to host cell interactions. We hypothesized that separation of the transplanted cells by a microporous membrane might inhibit most of the potential adverse effects and induce superior effect. The purpose of the study is to determine the optimal condition of the microporous membrane. Methods: First, BSCs were placed in polyethylene terephthalate (PET) transwell inserts with 3, 8, or $12{\mu}m$ pore size, and cultured in 24 well culture plates. After 5 days, bottoms of the plates were observed for presence of attached BSCs in monolayer and cell numbers were evaluated. Second, BSCs were placed PET, polycarbonate (PCT), and mixed cellulose esters (MCE) transwell inserts with 3 and $8{\mu}m$ pore size, and cultured in 24 well culture plates. After 3 days, the supernatants of the media left in culture plate were analyzed for collagen, vascular endothelial growth factor (VEGF), platelet derived growth factor BB (PDGF-BB), and basic fibroblast growth factor (bFGF). Third, BSCs were placed in 15% and 70% of the PET membrane with $3{\mu}m$ pore size. All the experimental conditions and methods were same as the second study. Results: The optimal pore sizes to prevent BSC leakage were $3{\mu}m$ and $8{\mu}m$. The amounts of type I collagen and three growth factors tested did not show significant differences among PET, PCT, and MCE groups. However, the collagen, VEGF, and bFGF levels were much higher in the high (70%) density group than in the low (15%) density group. Conclusion: This study revealed that the optimal pore size of membrane to prevent direct BSC to recipient cell contact is in between $3{\mu}m$ and $8{\mu}m$. Membrane materials and pore sizes do not influence the collagen and growth factor passage through the membrane. The most striking factor for collagen and growth factor transport is pore density of the membrane.
최적 연속 전해드레싱에 의한 연삭기구의 규명에 관한 연구
이은상,김정두,Lee, Eun-Sang,Kim, Jeong-Du 대한기계학회 1997 大韓機械學會論文集A Vol.21 No.8
In recent years, grinding techniques for precision machining of brittle materials used in electric, optical and magnetic parts have been improved by using superabrasive wheel and precision grinding machine. The completion of optimum dressing of superabrasive wheel makes possible the effective precision grinding of brittle materials. However, the present dressing system cannot have control of optimum dressing of the superabrasive wheel. In this study, a new system and the grinding mechanism of optimum in-process electrolytic dressing were proposed. This system can carry out optimum in-process dressing of superabrasive wheel, and give very effective control according to unstable current and gap increase. Therefore, the optimum in-process electrolytic dressing is a good method to obtain the efficiency and mirror-like grinding of brittle materials.
비만한 성인 남자에서 혈중 렙틴과 비알코올성 지방간과의 관계
이은상(Eun Sang Lee),이돈행(Don Haeng Lee),김승연(Seung Youn Kim),김진영(Jin Young Kim),김화숙(Wha Sook Kim),이훈재(Hoon Jae Lee),최원(Won Choi),김범수(Pum Soo Kim),김형길(Hyung Gil Kim),김영수(Young Soo Kim) 대한내과학회 2001 대한내과학회지 Vol.61 No.6
Background: The non-alcoholic fatty liver is characterised by accumulation of triglycerides within liver parenchymal cells without intake of alcohol. Leptin is produced by peripheral adipose cells and it's blood concentrations are positively correlated with blood insulin levels, independent of body mass index. Non-alcoholic fatty liver is associated with insulin resistance and hyperinsulinemia even in lean subjects. Therefore, we aimed to elucidate whether hyperleptinemia is associated with non-alcoholic fatty liver, independent of age and obesity. Methods : The age, weight, BMI and blood laboratory data such as LFT, lipid profiles, insulin, and leptin were analyzed on 26 control subjects and 30 non-alcoholic fatty liver subjects with BMI above 25 kg/㎡ in male adults. Results: There was no significant difference in their age, height, weight, and BMI between normal control group and non-alcoholic fatty liver group. But, blood triglyceride, leptin, and insulin level of patients with non-alcoholic fatty liver were significantly higher than those of normal control group. Conclusion: Blood leptin levels of non-alcoholic fatty liver group were significantly higher than that of control group. Thus, high circulating leptin concentrations may play a role in the pathogenesis of non-alcoholic fatty liver, regardless of age and obesity.(Korean J Med 61:634-640, 2001)
H-자형 이메소제닉 화합물; α,ω-Bis(2,5-bis(4-cyanophenoxy carbonyl)phenoxy)alkanes의 합성과 열방성 성질
박주훈,이환명,최옥병,이용섭,고경곤,이은상,송종혁,김기환,이은경,이창준,소봉근,이수민,Park, Ju-Hun,Lee, Hwan-Myeong,Choe, Ok-Byeong,Lee, Yong-Seop,Go, Gyeong-Gon,Lee, Eun-Sang,Song, Jong-Hyeok,Kim, Gi-Hwan,Lee, Eun-Gyeong,Lee, Chang-Jun,S 대한화학회 2006 대한화학회지 Vol.50 No.3