구매 프로젝트 학습이 지적장애학생의 경제개념 및 자기결정력에 미치는 영향

유진수,정동영 대구대학교 특수교육재활과학연구소 2013 특수교육재활과학연구 Vol.52 No.2

본 연구는 구매 프로젝트 학습이 지적장애학생의 경제개념 및 자기결정력에 미치는 영향을 알아보는데 그 목적이 있다. 이러한 목적을 달성하기 위해 중학교에 재학하고 있는 지적장애학생 30명을 선정하여 실험집단과 통제집단에 각각 15명씩 배치하고, 실험집단에 주1~3회씩 총 20회기에 걸쳐 구매 프로젝트 학습 프로그램을 시행하고, 통제집단에는 같은기간 동안 교사 주도의 ‘경제’관련 교육을 실시하였다. 본 연구에서 실험집단과 통제집단을대상으로 사전 및 사후 검사를 실시하고, 공분산 분석을 통해 효과 차이를 검증한 결과, 구매프로젝트 학습은 지적장애학생의 경제개념 습득에 유의한 효과가 있었고, 지적장애학생의 자기결정력 향상에도 유의한 효과가 있는 것으로 나타났다. 따라서 구매 프로젝트 학습은 중학교 지적장애학생들의 경제개념 습득과 자기결정력 향상에 효과적인 교수방법이라고 할 수있다.

안전 영역 기반 자율주행 차량용 주행 경로 생성 및 추종 알고리즘 성능평가 연구

유진수,강경표,이경수,Yoo, Jinsoo,Kang, Kyeongpyo,Yi, Kyongsu 한국자동차안전학회 2019 자동차안전학회지 Vol.11 No.2

This paper describes the tracking algorithm performance evaluation for autonomous vehicle using a safety envelope based path. As the level of autonomous vehicle technologies evolves along with the development of relevant supporting modules including sensors, more advanced methodologies for path generation and tracking are needed. A safety envelope zone, designated as the obstacle free regions between the roadway edges, would be introduced and refined for further application with more detailed specifications. In this paper, the performance of the path tracking algorithm based on the generated path would be evaluated under safety envelop environment. In this process, static obstacle map for safety envelope was created using Lidar based vehicle information such as current vehicle location, speed and yaw rate that were collected under various driving setups at Seoul National University roadways. A level of safety was evaluated through CarSim simulation based on paths generated with two different references: a safety envelope based path and a GPS data based one. A better performance was observed for tracking with the safety envelop based path than that with the GPS based one.

RIE Surface Texturing for Optimum Light Trapping in Multicrystalline Silicon Solar Cells

유진수,조준식,한규민,이준신 한국물리학회 2012 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.60 No.12

Optical losses by reflection and transmission of the incident light should be reduced to improve the efficiency of solar cells. Compared with antireflection coatings, surface texturing is a more persistent and effective solution aiming at reducing light reflection losses. Alkali (NaOH, KOH) or acidic (HF, HNO3, CH3COOH) chemicals are used in conventional solar cell production lines for wet chemical texturing. However, Surface texturing is too difficult to apply to solar cell fabrication with thinner wafers due to the large amount of silicon loss caused by saw damage removal (SDR) and the texturing process for multicrystalline silicon (mc-Si). In order to solve the problems, reactive ion etching (RIE) has been applied for surface texturing of solar cell wafers. The RIE method can be effective in the reducing surface reflection with low silicon loss. In this study, we, therefore, fabricated a large-area (243.3 cm2) mc-Si solar cell by maskless surface texturing using a SF6/O2 RIE process. Also, we achieved a conversion efficiency (Eff), open circuit voltage (Voc), short circuit current density (Jsc) and fill factor (FF) as high as 17.2%, 616 mV, 35.1 mA/cm2, and 79.6%, respectively, which are suitable for fabricating thin crystalline silicon solar cells at low cost and with high efficiency.

실리콘 태양전지 핵심기술연구센터

유진수,유권종,송희은,김석기 대한전기학회 2011 전기의 세계 Vol.60 No.3

결정질 실리콘 태양전지 기술현황 및 시장동향

유진수,Yu, Jin-Soo 한국전기전자재료학회 2009 전기전자재료 Vol.22 No.6

전세계 태양광 시장 동향 및 향후 전망

유진수,유권종,이준신 대한전자공학회 2008 전자공학회지 Vol.35 No.6

Electrical Characterization of MIS Devices Using PECVD SiNx:H Films for Application of Silicon Solar Cells

유진수,조준식,박주형,안승규,신기식,윤경훈,이준신 한국물리학회 2012 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.61 No.1

The surface passivation of crystalline silicon solar cells using plasma enhanced chemical vapor deposition (PECVD), hydrogenated, silicon-nitride (SiN_x:H) thin films has become significant due to a low-temperature, low-cost and very effective defect passivation process. Also, a good quality antireflection coating can be formed. In this work, SiNx:H thin films were deposited by varying the gas ratio R (=NH₃/SiH₄+NH₃) and were annealed by rapid thermal processing (RTP). Metalinsulator-semiconductor (MIS) devices were fabricated using SiNx:H thin films as insulator layers and they were analyzed in the temperature range of 100 - 400 K by using capacitance-voltage (C-V) and current-voltage (I-V) measurements. The annealed SiN_x:H thin films were evaluated by using the electrical properties at different temperature to determine the effect of surface passivation. We achieved an energy conversion efficiency of 18.1% under one-sun standard testing conditions for large-area (156 mm ?156 mm) crystalline-silicon solar cells.

Solar Cells Fabrication on Textured Tricrystalline Silicon Wafers Using a Different Wet Texturing Technique

유진수,조준식,한규민,이준신 한국물리학회 2011 THE JOURNAL OF THE KOREAN PHYSICAL SOCIETY Vol.59 No.5

The tricrystalline silicon (Tri-Si) is a promising material for reducing the cost of solar cells fabrication due to its lower cost, thinner wafer, and fast processing as a result of better mechanical strength. However, surface texturing using alkaline solution is ineffective for high efficiency silicon solar cells due to its (110) orientation. In this study, we performed surface texturing with acidic mixture (HF, HNO<SUB>3</SUB>, DI water) to create a uniformly textured surface and to dislocate or stain etching. The textured silicon surface by acidic solution was also investigated through surface reflectance for light trapping compared with the silicon surface textured by conventional alkaline solution. Using the optimum process condition, a fill factor of 80% has been obtained with a conversion efficiency of 16.79% in a tricrystalline silicon wafer of an active surface area of 156 cm<SUP>2</SUP>. This result is mainly due to an increase in short-circuiting current density. It is, therefore, possible to fabricate the thin tricrystalline silicon solar cell of high efficiency and low cost.

장기이식의 역사와 주요 면역억제제의 발전

유진수 대한의사협회 2020 대한의사협회지 Vol.63 No.5

The history of organ transplantation is limited to the last century. To overcome the barrier of the host immune system, which results in transplant rejection, the pioneers of transplantation achieved their first success by performing a kidney transplantation between identical twins. This achievement led the transplant clinicians to perform transplantations with immunological barriers present. Strategies such as whole-body irradiation combined with steroids yielded success in kidney transplantation between non-identical twins and siblings. However, owing to the toxicity related to irradiation, the paradigm shifted to the use of immunosuppressants. Azathioprine, steroids, and anti-lymphocyte globulin became the first multiple immunosuppressive regimens. With the introduction of cyclosporine, the 1-year survival rate increased by more than 80%. Cyclosporine, azathioprine, and steroids became the new standard maintenance regimens until the introduction of tacrolimus and mycophenolate mofetil, which replaced cyclosporine and azathioprine, respectively. The most recent change in immunosuppressants was the development of monoclonal antibodies with specific binding sites, such as CD20 (rituximab) and CD25 (basiliximab). With the innovation of molecular engineering and new insights into the costimulatory pathways, new molecules are under investigation in the field of transplantation.

표면 텍스쳐된 ZnO:AI 투명전도막 증착 및 특성

유진수,이정철,김석기,윤경훈,박이준,이준신 대한전기학회 2003 전기학회논문지C Vol.52 No.9

- Transparent conductive oxides (TCO) are necessary as front electrode for most thin film solar cell. In our paper, transparent conducting aluminum-doped Zinc oxide films (ZnO:Al) were prepared by rf magnetron sputtering on glass (Corning 1737) substrate as a variation of the deposition condition. After deposition, the smooth ZnO:Al films were etched in diluted HCl (0.5%) to examine the electrical and surface morphology properties as a variation of the time. The most important deposition condition of surface-textured ZnO films by chemical etching is the processing pressure and the substrate temperature. In low pressures (0.9mTorr) and high substrate temperatures (≤300℃), the surface morphology of films exhibits a more dense and compact film structure with effective light-trapping to apply the silicon thin film solar cells.