The Effects of Adding a Variation to Teacher-Created Videos on Korean Middle School Students’ Flipped Vocabulary Learning

Yunkyung Bae,Junkyu Lee 서울대학교 교육종합연구원 2019 The SNU Journal of Education Research Vol.28 No.4

This study investigates whether the presence of the teacher’s face in flipped vocabulary learning videos affects Korean middle students’ vocabulary learning outcomes and their perceptions of flipped vocabulary learning. Fifty-four second graders from three intact classes of a public middle school were divided into three groups: (1) the TP group (the video in which the teacher’s face and voice was present), (2) the TA group (the video where the teacher’s face was absent), and (3) the F2F offline group (the face-to-face offline lecture group). The results showed that TP group (the students who were in the flipped group watching a video in which the teacher’s face was present) outperformed the students in the other two groups (TA group and F2F group). In addition, the students in the lecture groups (F2F group) outperformed those who learned in a flipped method through a video in which the teacher’s face was absent (TA group).

터치스크린 기반 미디어아트 작품 사례 분석 연구

배윤경(Bae, Yunkyung),김형기(Kim, Unzi) 한국디자인지식학회 2013 디자인지식저널 Vol.25 No.-

1971년에 개발된 터치스크린은 최근 스마트폰과 태블릿 PC가 상용화 되면서 우리 생활에 깊숙이 자리 잡고 있다. 터치스크린은 인간의 조작도구인 손과 스크린 프로그램들 사이에 조작-실행의 단계에서 별도의 매개 장치가 필요없이 즉각적인 피드백을 가능하게 하여 인간의 ‘보는 방식의 변화’를 가져왔다. 본 논문에서는 시각에서 촉각으로 보는 방식의 변화 속에, 미디어 아트 속 터치스크린을 기반으로 한 작품들의 사례를 유형별로 나누어 분석하였다. 저항막, 정전용량, 적외선, 초음파 4가지 방식으로 적용하는 터치스크린 미디어 아트 작품들을 인터페이스 유형에 따라 일치형과 분리형으로 분류하고, 콘텐츠 유형별로 2차 분류, 분석하였다. 이러한 과정을 통하여 인간의 감각 중 촉각적 시각성의 개념을 이해하고 촉각을 통한 미디어 아트에서 터치스크린을 통한 관객과의 소통방법을 연구하고자 한다. Touch Screen, is invented in 1971, is settled in our modern life as daily using Smart Mobile and Tablet PC. It is possible to give feedback immediately without medium that connect between hand and programme to control and action. It also changes in society brought about a way to see a media. In this study, it is analyzed the case studies of the touch screen based media art in change the way to see from vision to tactile sensation. There are 4types of touch screen; Resistive Type, Capacitive Type, Infrared Beam, Surface Acoustic Wave. Firstly, Touch screen based media art works are classified separation and consensus type in interface design. Secondly, those are categorized as contents. In this process, it is understood the definition of touch screen and concept of tactile vision. Also it is studied of communication with spectator through touch screen in media art.

The extract of <i>Cinnamomum cassia</i> twigs inhibits adipocyte differentiation via activation of the insulin signaling pathway in 3T3-L1 preadipocytes

Han, Yunkyung,Jung, Hyo Won,Bae, Hyo Sang,Kang, Jong-Seong,Park, Yong-Ki Informa Healthcare USA, Inc. 2013 Pharmaceutical biology Vol.51 No.8

<P><I>Context</I>: Obesity is associated with a number of diseases with metabolic abnormalities such as type 2 diabetes (T2D). Medicinal plants have been widely used for the treatment of obesity and related complications.</P><P><I>Objective</I>: In this study, we investigated the antidiabetic properties of the extract of twigs of <I>Cinnamomum cassia</I> Blume (Lauraceae) (Cinnamomi Ramulus; CR) in 3T3-L1 murine preadipocytes.</P><P><I>Materials and methods</I>: 3T3-L1 cells were differentiated into adipocytes for 3 d in insulin-conditioned medium and then treated with CR extract at concentrations of 100 and 500 μg/mL for 6 d. Adipocyte differentiation was measured by Oil Red O staining, and the expression of master transcription factors, peroxisome proliferator-activated receptor-gamma (PPARγ), CCAAT/enhancer binding protein-alpha (C/EBPα), and sterol regulatory element binding protein-1c (SREBP-1c), and lipid metabolism factors were investigated by reverse transcription-polymerase chain reaction (RT-PCR). The activation of the AMP-activated protein kinase (AMPK)/insulin signaling pathway was assessed by western blot analysis.</P><P><I>Results</I>: CR extract significantly reduced lipid accumulation and down-regulated the expression of PPARγ, C/EBPα, and SREBP-1c in 3T3-L1 adipocytes. CR extract also suppressed the expression of fatty acid synthase (FAS), acyl-CoA synthase, and perilipin. Moreover, CR extract markedly up-regulated the phosphorylation of AMPK and acetyl-CoA carboxylase (ACC). In addition, CR extract effectively increased the expression levels of glucose transporter-4 (GLUT-4), phosphatidylinositol 3-kinase (PI3K), and insulin receptor substrate-1 (IRS-1) in 3T3-L1 adipocytes.</P><P><I>Discussion and conclusion</I>: These results suggest that CR extract may have therapeutic potential as a natural agent for the improvement of T2D via regulation of the insulin-dependent signaling pathway.</P>

목재 수분 측정에 이용되는 전건법의 불확도 평가

정인직(Injik Jeong),배윤경(Yunkyung Bae),소홍민(Hongmin So) 대한기계학회 2019 대한기계학회 춘추학술대회 Vol.2019 No.11

국내 도로부문 오염물질의 공간적 확산을 고려한 대기오염농도 분석방법론 연구

김대진(KIM, Daejin),배윤경(BAE, Yunkyung),김상록(KIM, Sangrok) 대한교통학회 2022 대한교통학회지 Vol.40 No.3

본 연구는 도로사업으로 인한 대기오염물질의 공간적 확산행태를 분석하고 관련된 편익을 추정하는 체계적인 방법론을 제시하는 것을 목표로 한다. 이를 위해, 관련된 연구를 선도하고 있는 미국의 연구 사례를 고찰하고, 국내에 적용가능한 방법론을 모색하였다. 구체적으로 본 연구는 AERMOD에 기반한 대기확산 모델링 방법론을 제시하였으며, 효율적인 모델링을 위해 자동화된 Python 프로그램을 개발하였다. 본 연구에 제시된 대기오염물질 공간적 확산 분석 모델링 툴은「서울-양평 고속도로」와「제천-영월고속도로」사업에 적용되었으며, 도로 사업에 따른 대기오염농도 변화를 분석하고, 이를 바탕으로 사업 시행에 따른 효과를 분석하였다. 사례 분석결과, 도로 사업으로 인해 일부 지역(특히 신규 도로 사업구간 주변)에서는 오염물질 농도가 증가할 수 있으나, 대다수의 지역은 오염물질 농도 감소로 인한 편익이 발생할 것으로 나타났다. 대기오염 농도 변화 추정 결과를 바탕으로 고속도로 사업 시행에 따른 환경편익을 추정하였다. 지불용의액에 기반한 편익 추정(성가심비용) 결과 연간 약 22-1,084백만 원의 편익이 발생하는 것으로 나타났다. 본 연구는 대기확산 모델링에 기반한 국내 도로사업의 환경편익 추정 가능성을 제시하였으며, 향후 국내 도로사업 평가체계(예: 예비타당성조사 제도)에 정책적 평가지표로 활용될 수 있을 것으로 기대한다. This study is to develop a modeling framework for predicting near-road pollutant concentrations to evaluate the environmental benefits of road construction in Korea. Based on the literature review, AERMOD-based atmospheric dispersion modeling method was applied to predicting near-road pollutant concentration levels in Korea. The modeling method integrates the processes of generating input data (e.g. transportation demand, meteorology, road network, etc.), estimating link emissions, predicting pollutant concentrations, and estimating the environmental benefits. The case study predicted the changes in the pollutant concentrations after the constructions of projected highways (e.g. Seoul-Yangpyeong and Jecheon-Yeongwol Expressway), and then it evaluated the environmental benefits of constructing highways in terms of annoyance cost. This study evaluated the feasibility of air quality modeling analysis based on the USEPA’s recommended dispersion modeling tool (i.e. AERMOD) for the environmental impact assessments of road construction in Korea, based on Python programming incorporating advanced modeling algorithm. It is expected that the modeling system developed in this study can be applied to the environmental impact assessment processes of transportation projects in Korea.

중국 대학의 한국어 교과과정 재검토 및 개선 방향 탐색

김영희 ( Jin Yingji ),배윤경 ( Bae Yunkyung ) 중국한국(조선)어교육연구학회 2020 한국(조선)어교육연구 Vol.15 No.-

According to the foreign language talent training objective raised by the Ministry of Education of China, it is necessary to review and revise the Korean language curriculum of universities in China. In particular, the recent foreign language talent training objective raised the demand for knowledge of humanities and social sciences, so universities in China should review and improve the Korean language curriculum. Therefore, in this paper, as a part of Korean language curriculum improve process of Guangdong University of Foreign Studies, we looked at the current status of Korean language curriculum at 31 universities in China, in order to find the problems and find the directions for improvement.

In vitro Expansion of Umbilical Cord Blood Derived Mesenchymal Stem Cells (UCB-MSCs) Under Hypoxic Conditions

Jungyun Yang,Jihye Kwon,Miyeon Kim,Yunkyung Bae,Hyejin Jin,Hohyun Park,Young Woo Eom,Ki-Jong Rhee 대한의생명과학회 2015 Biomedical Science Letters Vol.21 No.1

Mesenchymal stem cells (MSCs) have the ability to self-renew and differentiate into multi-lineage cells, thus highlighting the feasibility of using umbilical cord blood-derived MSCs (UCB-MSCs) for cell-therapy and tissueengineering. However, the low numbers of UCB-MSC derived from clinical samples requires that an ex vivo expansion step be implemented. As most stem cells reside in low oxygen tension environments (i.e., hypoxia), we cultured the UCBMSCs under 3% O2 or 21% O2 and the following parameters were examined: proliferation, senescence, differentiation and stem cell specific gene expression. UCB-MSCs cultured under hypoxic conditions expanded to significantly higher levels and showed less senescence compared to UCB-MSCs cultured under normoxic conditions. In regards to differentiation potential, UCB-MSCs cultured under hypoxic and normoxic conditions both underwent similar levels of osteogenesis as determined by ALP and von Kossa assay. Furthermore, UCB-MSCs cultured under hypoxic conditions exhibited higher expression of OCT4, NANOG and SOX2 genes. Moreover, cells expanded under hypoxia maintained a stem cell immnunophenotype as determined by flow cytometry. These results demonstrate that the expansion of human UCB-MSCs under a low oxygen tension microenvironment significantly improved cell proliferation and differentiation. These results demonstrate that hypoxic culture can be rapidly and easily implemented into the clinical-scale expansion process in order to maximize UCB-MSCs yield for application in clinical settings and at the same time reduce culture time while maintaining cell product quality.

Data-driven degradation trend construction method for RUL prediction

MinSeop Kim,HanByeol Park,MinGyu Park,JaeEun Kwon,DoHee Kim,Hyerim Bae,YunKyung Park 한국콘텐츠학회 2023 한국콘텐츠학회 ICCC 논문집 Vol.2023 No.12

상태기반 정비를 위한 초기 성능저하 시점(First Prediction Time, FPT) 추정 연구

박민규(MinGyu Park),박한별(Hanbyeol Park),김민섭(Minseop Kim),김도희(Dohee Kim),박연경(Yunkyung Park),배혜림(Hyerim Bae) 한국전자거래학회 2024 한국전자거래학회지 Vol.29 No.1

장비의 고장 및 성능의 저하를 방지하기 위해서는 시스템의 상태를 모니터링 하고 장비의 고장을 예측하는 것이 필요하다. 이는 상태기반정비(Condition Based Maintenance +, CBM+)라고 불리며, 이를 위해서는 기계 혹은 장비의 상태를 실시간으로 진단하고, 초기 고장 감지 및 열화 상태를 예측하는 예측유지관리(Prognostics and Health Management, PHM)가 필수적이다. 본 논문에서는 무기체계의 냉매 누출의 문제에서 CBM+를 구현하기 위한 초기 냉매 누출시점(First Prediction Time, FPT) 추정방법론을 제시한다. 이는 냉매 누출 상태인 건강상태지표(Health Indicator, HI)를 보다 효과적으로 표현하여, 잔존수명(Remaining Useful Lifetime, RUL) 예측 성능에 큰 기여를 할 수 있다. 제안하는 방법론의 효율성은 현재 운용중인 무기체계에서 수집된 데이터를 통해 검증되었으며, FPT을 반영한 RUL 예측 성능이 FPT를 반영하지 않은 경우에 비해 우수한 성능을 보였다. 본 연구 방법론은 유사한 특성을 가진 하위부품에 대한 CBM+ 적용에 유용한 가이드라인으로 활용될 수 있을 것으로 보인다. To prevent equipment malfunction and degradation of performance, it is imperative to monitor the system status and anticipate equipment failures. This approach is referred to as Condition Based Maintenance Plus (CBM+), necessitating the real-time diagnostic of machinery or equipment status and the predictive maintenance via Prognostics and Health Management (PHM) to predict initial failures and degradation states. This paper presents a methodology for estimating the First Prediction Time (FPT) to implement CBM+ in addressing the issue of refrigerant leakage in weapon systems. This entails representing the Health Indicator (HI) for refrigerant leakage status more effectively, thereby significantly contributing to the predictive performance of the Remaining Useful Lifetime (RUL). The efficacy of the proposed methodology has been validated through data collected from currently operating weapon systems and has demonstrated superior RUL prediction performance when incorporating FPT compared to without its incorporation. The research methodology proposed herein appears to be a viable guideline for the application of CBM+ to subcomponents with similar characteristics.