학습부진학생 지원을 위한 전통놀이 교수·학습 프로그램 개발: ‘자연탐험 윷놀이’ 자료 개발을 중심으로

이재진 ( Lee¸ Jaejin ),김성욱 ( Kim¸ Sungwook ) 서울교육대학교 초등교육연구원 2021 한국초등교육 Vol.32 No.3

본 연구의 목적은 학습부진학생들의 소근육운동과 학습동기 향상을 위해 전통놀이를 기반으로 한 교수·학습 프로그램을 설계·개발하고, 개발물의 현장 적용 가능성을 탐색하는 것이다. 이를 위해 연구진은 전통놀이 사례 검토와 전문가 협의회를 통해 자료 개발의 방향을 설정하고 전통놀이 활동을 위한 프로토타입 키트를 개발하여 타당화하였다. 또한 전통놀이 프로토타입을 토대로 ‘자연탐험 윷놀이’ 프로그램을 개발하여 개발 결과물에 대한 수정과 보완을 거쳐 최종 결과물에 대한 타당성을 확보하였다. 본 연구에서 개발한 프로그램은 수업에 참여하는 학습부진학생들이 학습에 흥미를 느끼고, 협력적 놀이 활동을 통해 학습자들 간의 유대감을 높이며 친밀감을 증진시키는 요소가 포함되어 있다. 교육 프로그램 내 교수·학습 자료를 제작하는 만들기 활동이 있는 경우, 자료의 개발 절차가 과학적 연구방법론을 토대로 타당하게 이루어져야 한다. 전통놀이 키트와 교수·학습 프로그램 개발의 과정에는 프로토타입(Rapid prototyping) 개발 방법이 적용되었다. 개발 결과에 대한 전문가 검토를 위해 총 8명의 전문가가 참여하였으며, 사용성 평가를 위해 4명의 학생이 참여한 소그룹 수업을 운영하였다. 연구 결과, 전통놀이 키트와 프로그램의 프로토타입은 전통놀이 도구의 조립 과정에 대한 안내 부족, 교수·학습 프로그램의 진행과정에 대한 설명력 문제 등을 보완하여 최종적으로 학습부진학생 지원을 위한 프로그램으로써의 타당성을 확보하였다. 프로그램 적용을 위한 소그룹 수업 결과에서도 학생들은 전통놀이 만들기 활동과 윷놀이 미션 활동에 소근육운동과 학습 참여가 증가하는 것으로 나타났으며, 전반적으로 전통놀이 활동은 학생들의 긍정적 반응과 학습 참여 동기를 향상시킨 것으로 나타났다. 마지막으로, 본 연구의 프로그램 개발 결과에 따른 학습부진학생 지원을 위한 프로그램 개발의 의의를 논의하고 향후 연구를 위한 방향이 제시되었다. The purpose of this study is to design and develop the teaching and learning program based on traditional play so as to develop small muscles of hands and improve learning motivation for underachievers. In order to realize the purpose of the study, researchers established directions for material development and develop and validate a prototype kit of the traditional game activity through examining traditional play cases and holding an expert council. In addition to this, researchers developed ‘Nature Exploration with Yut-Nori’ based on the prototype of traditional game play and secured validity on the final version by revising and supplementing the developed program. In the development process of traditional game play kit and teaching and learning program for it, ‘Rapid prototyping’ method has been applied. A total of eight experts participated to review the development results, while the researchers operated a small group class involving four students for usability test. As a result of the study, traditional play kit and the prototype of the program finally secured the validity after supplementing the lack of guidance on the assembly process of traditional play tools and the problem in explanation on the teaching and learning process. The result of small group class for the application of the program also showed that students’ participation in hand muscle activity and learning has increased both in traditional game tools making and Yut-nori mission activities. Overall, traditional play activities improved students’ positive responses and motivation to participate in learning. Finally, researchers discussed the significance of the program development to support underachievers according to the program development results of this study and suggested the direction for future research.

Both CD45RA⁺ and CD45RO⁺ human CD4⁺ T cells drive direct xenogeneic T-cell responses against porcine aortic endothelial cells

Kim, Chi Hwa,Oh, Keunhee,Kim, Dong-Eun,Lee, Seul Bee,Yang, Ji Hye,Lee, Gene,Cho, Jaejin,Lee, Dong-Sup Blackwell Publishing Ltd 2010 Xenotransplantation Vol.17 No.3

<P>Kim CH, Oh K, Kim D-E, Lee SB, Yang JH, Lee G, Cho J, Lee D-S. Both CD45RA<SUP>+</SUP> and CD45RO<SUP>+</SUP> human CD4<SUP>+</SUP> T cells drive direct xenogeneic T-cell responses against porcine aortic endothelial cells. Xenotransplantation 2010; 17: 224–232. © 2010 John Wiley & Sons A/S.</P><P>Abstract: Background: </P><P>Xenogeneic cellular immune responses are mediated by either direct or indirect pathways depending on the participation of donor or host antigen presenting cells, respectively. The contribution of direct response of human T cells, especially memory T cells, to porcine antigen presenting cells is currently unknown. Here, we sought to determine whether human peripheral blood memory/activated phenotype T cells are directly responsive to porcine endothelial cells.</P><P>Methods: </P><P>Porcine aortic endothelial cells (PAECs) were prepared from Yorkshire or miniature pigs. Highly purified human T cells, including naïve and memory/activated phenotype cells, were incubated with PAECs with or without the addition of exogenous cytokines. T-cell proliferation and T-cell receptor (TCR) V&bgr; usage in response to PAECs were analyzed.</P><P>Results: </P><P>Both CD8<SUP>+</SUP> and CD4<SUP>+</SUP> T cells responded directly to PAECs and exhibited exclusive responsiveness to SLA class I and class II molecules, respectively. Naïve and memory/activated phenotype CD4<SUP>+</SUP> T cells responded against PAECs, whereas only naïve phenotype CD8<SUP>+</SUP> T cells contributed to such a response. In addition, both populations of xenogeneic human CD4<SUP>+</SUP> T cells exhibited similar and diverse V&bgr; usage.</P><P>Conclusion: </P><P>Due to the considerable contribution of human CD45RO<SUP>+</SUP>CD4<SUP>+</SUP> T cells to the xenoreactivity against PAECs, effective control of xenogeneic memory/activated T-cell responses would significantly affect long-term survival of transplanted grafts.</P>

미세 힘 센서에 적용 가능한 Ni-Co 유연 구조체 기반 백금 스트레인 게이지의 제작 및 성능 평가

김재진(Jaejin Kim),김우진(Woojin Kim),김윤호(Yunho Kim),김용대(Yongdae Kim) 대한기계학회 2020 大韓機械學會論文集B Vol.44 No.2

폐정맥의 비정상적인 전기 방전에 의해 발생하는 심방세동은 주로 고주파 절제술(radio frequency ablation)용 카테터를 이용하여 비정상 조직을 괴사시켜 치료한다. 고주파 절제술의 치료 성공률을 높이기 위해서는 비정상 조직에 적절한 접촉력(약 0.2~0.3N)을 인가하면서 시술을 해야 한다. 따라서 고주파 절제술용 카테터에는 실시간 접촉력 모니터링을 위한 미세 힘 센서가 반드시 필요하다. 본 논문에서는 고주파 절제술용 카테터의 미세 힘 센서에 적용 가능한 Ni-Co 유연 구조체 기반 백금 스트레인 게이지의 제작 공정 및 성능 평가 결과를 기술하였다. 기계적 강도와 내식성이 우수한 Ni-Co 유연 구조체 위에 백금 스트레인 게이지를 형성하기 위한 새로운 제작 공정을 확립하였으며, 이 공정을 통해 제작한 백금 스트레인 게이지를 금속 외팔보에 접착하여 게이지 팩터, 선형성, 히스테리시스 등 성능 평가를 실시하였다. Atrial fibrillation caused by the abnormal electrical discharge of the pulmonary vein is treated by isolating abnormal tissues using radio-frequency catheter ablation. To increase the success rate of this process, an appropriate contact force (approximately 0.2 N to 0.3 N) should be applied to abnormal tissues during the ablation process. Therefore, a precision force sensor is required for real-time monitoring of the contact force in the catheter. This report describes the fabrication process and performance evaluation results of a Pt strain gauge formed on a Ni-Co flexible structure that is applicable to the micro force sensor of a radio frequency ablation catheter. In this study, we establish a new process for the fabrication of Pt strain gauges on Ni-Co flexible structures that is characterized by excellent mechanical strength and corrosion resistance. In addition, the performance of the Pt strain gauges including the gauge factor, linearity, and hysteresis are evaluated.

Common rail 디젤엔진에서 EGR Cooler Fouling에 관한 실험적 연구

김재진(Jaejin Kim),김윤형(Yunhyung Kim),이상근(Sangeun Lee),김정선(Jungsun Kim) 한국자동차공학회 2007 한국자동차공학회 춘 추계 학술대회 논문집 Vol.- No.-

SUV and Diesel engine is increase cause by merit of Fuel consumption and high efficiency. Hence emission regulation is stringent in vehicles. To clear regulation, many systems are applied to diesel engine. Cooled EGR System is representative system to decreasing NOx in recently. This research focused on the optimization of EGR Cooler. EGR Cooler has to need high heat transfer performance as well as reliability. To reach both of them, 5 variant samples were tested in the Dynamo-meter by severed field driving condition, were monitored heat transfer performance and fouling condition, and were evaluated which one is the best of them. Result of this study will of fer a possibility of the optimal design with view of EGR Cooler reliability.

Variation of Floating Potential in the Topside Ionosphere Observed by STSAT-1

Junhyun Lee,Ensang Lee,Jaejin Lee,Khan-Hyuk Kim,Jongho Seon,Dong-Hun Lee,Ho Jin,Eung-Hyun Kim,Hyun-Jin Jeon,Seong-Bin Lim,Taeyoun Kim,Jaewoong Jang,Kyung-Duk Jang,Kwangsun Ryu 한국우주과학회 2014 Journal of Astronomy and Space Sciences Vol.31 No.4

In this study, we investigated the effect of space plasmas on the floating potential variation of a low-altitude, polar-orbiting satellite using the Langmuir Probe (LP) measurement onboard the STSAT-1 spacecraft. We focused on small potential drops, for which the estimation of plasma density and temperature from LP is available. The floating potential varied according to the variations of plasma density and temperature, similar to the previously reported observations. Most of the potential drops occurred around the nightside auroral region. However, unlike the previous studies where large potential drops were observed with the precipitation of auroral electrons, the potential drops occurred before or after the precipitation of auroral electrons. Statistical analysis shows that the potential drops have good correlation with the temperature increase of cold electrons, which suggests the small potential drops be mainly controlled by the cold ionospheric plasmas.

초소형위성 SNIPE 본체 설계 및 개발

김해동,최원섭,김민기,김진형,김기덕,김지석,조동현,이재진,Kim, Hae-Dong,Choi, Won-Sub,Kim, Min-Ki,Kim, Jin-Hyung,Kim, KiDuck,Kim, Ji-Seok,Cho, Dong-Hyun,Lee, Jaejin 한국우주과학회 2022 우주기술과 응용 Vol.2 No.2

In this paper, the contents of the design and development process of the 6U micro-satellite Snipe (SNIPE, national name Toyosat; small scale magnetospheric and Ionospheric plasma experiment ), which was developed to observe the near-global space environment through polarization flight for the first time in Korea, were described. Snipe performs transversal flight to observe the Earth's surrounding space environment in three dimensions, and aims to simultaneously observe the space plasma density and temperature in the ionosphere, as well as temporal changes in the solar magnetic field and electromagnetic waves. In this way, it was developed by dividing it into a test certification model (EQM) and a flight model (FM) to perform the actual mission for at least six months, away from developing a cube satellite for short-term space technology verification or manpower training. Currently, Snipe, which has completed the development of a total of four FM and completed all space environment tests, is scheduled to launch 2023. In this paper, we introduce the design contents and development process of the Snipe satellite body ahead of launch, and hope that it will be a useful reference for the development of 6U-class micro-satellite for full-scale mission in Korea.

RBSP (Radiation Belt Storm Probes) Mission, Space weather and Science Topics

Jaejin Lee,Kyung-Chan Kim,JungA Hwang,Yeon-han Kim,Young-deuk Park 한국천문학회 2012 天文學會報 Vol.37 No.1

Feasibility Study for the Monitoring of Urea in Dialysate Solution using Raman Spectroscopy

Jaejin Kim,Jinyoung Hwang,Yongdan Kim,정회일 대한화학회 2011 Bulletin of the Korean Chemical Society Vol.32 No.3

We have determined the urea concentration in an aqueous solution using Raman spectroscopy by incorporating a Teflon tube as an effective intensity correction standard as well as sample container. A non-overlapping Teflon band was used as the reference peak to correct Raman intensity variations that occasionally resulted from changes in laser power. To increase the sensitivity, we positioned a copper reflector inside the Teflon tube to maximize the collection of Raman scattering. The obtained accuracy using Raman spectroscopy was 0.53mM, close to the range of accuracy of previous NIR studies (0.15-0.52 mM).

Highly efficient epitaxial Ge solar cells grown on GaAs (001) substrates by MOCVD using isobutylgermane

Kim, Youngjo,Kim, Kangho,Kim, Chang Zoo,Jung, Sang Hyun,Kang, Ho Kwan,Park, Won-Kyu,Lee, Jaejin North-Holland 2017 Solar Energy Materials and Solar Cells Vol. No.

<P><B>Abstract</B></P> <P>Single-junction Ge solar cells have been epitaxially grown on GaAs (001) substrates by a low pressure metalorganic chemical vapor deposition using isobutylgermane. Various growth conditions have been studied to reduce the high doping level of over 1×10<SUP>19</SUP> cm<SUP>−3</SUP> of the p-type Ge epitaxial layer, which is detrimental to the minority carrier collection efficiency. By increasing the growth rate and employing a discontinuous doping technique, the p-type doping level of the epitaxial Ge layer has been lowered to 2×10<SUP>18</SUP> cm<SUP>−3</SUP>, and the hole mobility increased from 44 to 162cm<SUP>2</SUP>/Vs. A high power conversion efficiency of 6.72% can be achieved under AM1.5G illumination by the epitaxial Ge solar cell with the lowered doping level in the p-type Ge base region. The spectral response of the epitaxial Ge solar cell with a 5µm thick base layer is good enough to use for InGaP/GaAs/Ge triple-junction solar cells.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Single-junction Ge solar cells are epitaxially grown on GaAs (001) substrates. </LI> <LI> Epitaxial Ge p-n junction is realized by MOCVD growth using isobutylgermane. </LI> <LI> Discontinuous doping technique is introduced to minimize the p-type Ge doping level. </LI> <LI> High efficiencies over 6.5% can be achieved by the epitaxial Ge solar cells. </LI> <LI> Ge epitaxy using MOCVD can be employed for III-V multi-junction solar cells. </LI> </UL> </P>

Effect of N-doped carbon layer on Co₃O₄ nanowire-graphene composites as anode materials for lithium ion batteries

Kim, Yoongon,Noh, Yuseong,Han, Hyunsu,Bae, Jaejin,Park, Sungmin,Lee, Seungjun,Yoon, Wongeun,Kim, Ye Kyu,Ahn, Hyunwoo,Ham, Moon-Ho,Kim, Won Bae Elsevier 2019 The Journal of physics and chemistry of solids Vol.124 No.-

<P><B>Abstract</B></P> <P>In this paper, an anode material system of Co<SUB>3</SUB>O<SUB>4</SUB> nanowires composited with reduced graphene oxide (Co<SUB>3</SUB>O<SUB>4</SUB> NWs/rGO) and protected by N-doped carbon layer (Co<SUB>3</SUB>O<SUB>4</SUB> NWs/rGO@NC) was prepared for lithium ion batteries. The N-doped carbon layer could serve as stress relief matter to reduce volume changes of the Co<SUB>3</SUB>O<SUB>4</SUB> NWs/rGO during repeated charge/discharge cycles, and also enhance the reaction kinetics as a highly conductive layer between the Co<SUB>3</SUB>O<SUB>4</SUB> NWs and electrolyte. The Co<SUB>3</SUB>O<SUB>4</SUB> NWs/rGO@NC electrode delivered a high discharge capacity of ca. 995 mAh g<SUP>−1</SUP> at 0.1 C after 65 cycles, and showed a much better rate performance of 428 mAh g<SUP>−1</SUP> even at a high current rate of 5 C as compared to those of Co<SUB>3</SUB>O<SUB>4</SUB> NWs/rGO electrode (203 mAh g<SUP>−1</SUP>). The demonstrated electrochemical properties suggested that the N-doped carbon coating on the composite of Co<SUB>3</SUB>O<SUB>4</SUB> NWs and rGO could significantly enhance the durability and rate capability of the anode material for high performance lithium ion batteries.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Nitrogen atoms were reacted with defects of carbon material and doped in the lattice. </LI> <LI> N-doped carbon layer enhances the reaction kinetics between the Co<SUB>3</SUB>O<SUB>4</SUB> NWs and electrolyte. </LI> <LI> N-doped carbon coating could significantly enhance the durability and rate capability. </LI> </UL> </P>