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HVPE 방법에 의해 r-plane 사파이어 기판 위의 선택 성장된 GaN/AlGaN 이종 접합구조의 특성
홍상현,전헌수,한영훈,김은주,이아름,김경화,황선령,하홍주,안형수,양민,Hong, S.H.,Jeon, H.S.,Han, Y.H.,Kim, E.J.,Lee, A.R.,Kim, K.H.,Hwang, S.L.,Ha, H.,Ahn, H.S.,Yang, M. 한국결정성장학회 2009 한국결정성장학회지 Vol.19 No.1
본 논문에서는 혼합소스(mixed-source) HVPE(hydride vapor phase epitaxy)방법으로 선택성장(SAC: selective area growth) GaN/AlGaN 이종접합구조의 발광다이오드를 r-plane 사파이어 기판 위에 제작하였다. SAG-GaN/AlGaN DH(double heterostructure)는 고온 GaN 버퍼층, Te 도핑된 AlGaN n-클래딩층. Gan 활성층. Mg 도핑된 AlGaN p-클래딩층. Mg 도핑된 GaN p-캡층으로 구성되어있다. GaN/AlGaN 이종접합구조의 발광다이오드의 특성을 알아보기 위해 SEM을 통한 구조적 분석과 전류-전압 측정(I-V: current-voltage measurement), 전류-광출력(EL: electroluminescence) 측정을 통하여 전기적, 광학적 특성을 평가하였다. In this paper, a selective area growth (SAG) of a GaN/AlGaN double heterostructure (DH) has been performed on r-plane sapphire substrate by using the mixed-source hydride vapor phase epitaxy (HVPE) with multi-sliding boat system. The SAG-GaN/AlGaN DH consists of GaN buffer layer, Te-doped AlGaN n-cladding layer, GaN active layer, Mg-doped AlGaN p-cladding layer, and Mg-doped GaN p-capping layer. The electroluminescence (EL) characteristics show an emission peak of wavelength, 439 nm with a full width at half maximum (FWHM) of approximately 0.64 eV at 20 mA. The I-V measurements show that the turn-on voltage of the SAG-GaN/AlGaN DH is 3.4 V at room temperature. We found that the mixed-source HVPE method with a multi-sliding boat system was one of promising growth methods for III-Nitride LEDs.
홍상현(Sang-Hyun Hong),이정원(Jeong-Won Lee),김재훈(Jae-Hoon Kim),이상연(Sang-Yeon Lee),박재범(Jae-Beom Park),정규동(Gyoo-Dong Jung) 한국항공우주학회 2018 韓國航空宇宙學會誌 Vol.46 No.7
본 연구에서는 입자강화 복합재료의 파괴거동을 평가하기 위해 쐐기분열시험을 수행하였다. 균열 저항성을 분석하기 위해 균열선단열림변위(CTOD)와 균열선단열림각도(CTOA)를 이용하였다. 사용된 입자강화 복합재료는 특성상 온도와 하중속도에 영향을 많이 받기 때문에 다양한 온도(-60℃~50℃)와 하중속도(5~500mm/min)조건에서 시험을 수행하였다. 또한 균열선단에 대한 변형률장을 분석하기 위해 디지털 이미지 상관법(DIC)을 이용하였다. 시험결과 파괴에너지는 온도가 감소할수록 증가하였으며, 하중속도가 증가할수록 균열저항성이 증가하였다. In this study, wedge splitting tests were performed to evaluate fracture behavior of particle reinforced composite materials. Crack resistance was evaluated by using CTOD (crack tip opening displacement) and crack tip opening angle (CTOA). The particle reinforced composites were tested under various temperature (-60℃~50℃) and load speed (5~500mm/min). Also, digital image correlation method (DIC) was used to analyze the strain field at crack tip. Test results showed that the fracture energy increased with decreasing temperature and crack resistance increased with increasing load velocity.
영상콘텐츠 제작 수행활동을 활용한 이주-다문화 관련 교양 수업 운영 사례 - <문화다양성 공간 탐방과 디지털 노마드>의 수업 설계와 학습자의 만족도 조사를 중심으로
홍상현(Hong, Sanghyun) 이주사학회 2022 Homo Migrans Vol.26 No.-
COVID-19으로 인해서 지난 몇 년 동안 학생들은 온라인 환경에서의 수업에 익숙해지면서 온라인 수업이 유지되기를 바라는 의견이 많아지고 있다. 그들은 디지털-온라인 환경에서의 커뮤니케이션에 익숙한 세대이다. 따라서 온라인 수업이 갖는 편리함과 효율성이 그들에게는 보다 좋은 방식으로 생각되었을 것이다. 하지만 대면수업에 대한 기대감과 요구 또한 함께 늘어나고 있다. 즉, 온라인 수업과 대면수업에 대한 요구가 함께 증가하고 있는 아이러니한 상황이다. <문화다양성 공간 탐방과 디지털 노마드>는 온라인 수업이 갖는 편리함과 효율성, 그리고 대면수업에서의 프로젝트 수행 참여 두 가지를 함께 실현하기 위한 교과목 설계를 하였다. FL, PBL, 블렌디드 방식의 수업을 함께 활용하였으며, 수업의 구성과 진행은 아이즈너의 예술적 교육과정의 방법을 중심으로 이루어졌다. 이러 한 방식에 대한 학생들의 만족도는 상당히 좋았으며, 학생들의 만족도가 가장 높았던 부분은 ‘직접적인 참여’와 ‘동료들과의 협력’이었다. Due to COVID-19, over the past few years, as students become more accustomed to teaching in an online environment, there is a growing demand for online classes to be maintained. They are a generation accustomed to communicating in a digital-online environment. Therefore, the convenience and efficiency of online classes would have been thought of in a better way for them. However, expectations and demands for face-to-face classes are also increasing. In other words, it is an ironic situation that demands for online classes and face-to-face classes are increasing together. Multi-Cultural Spaces Exploration and Digital Nomad was designed to realize both the convenience and efficiency of online classes and participation in project implementation in face-to-face classes. FL, PBL, and blended learning were used together, and the composition and progress of classes was centered on Eisners art education curriculum method. Students satisfaction with this method was quite good, and the parts with the highest student satisfaction were direct participation and collaboration with colleagues.
홍상현 ( Sang Hyun Hong ),이주연 ( Joo Yeoun Lee ),왕지남 ( Gu Nam Wang ) 대한설비관리학회 2014 대한설비관리학회지 Vol.19 No.3
Human-Machine Interface (HMI) presents information of various equipments, products, and resources in a PLC controlled manufacturing process. Considerable times and efforts are required in order to build useful and meaningful HMI. In this paper we study an integrated functional HMI standard model in order to reduce times and efforts required to build an HMI system. The proposed HMI standard model can be applied for PLC controlled manufacturing system in order to monitor manufacturing process and also to control it efficiently and effectively. The standard model is based on systematic symbol name structure of manufacturing devices which is highly related PLC logics and hardware address. This strong relationship make it possible to map PLC address to user interface automatically as well as to represent useful information such as mal-functioning reasons and a significant manufacturing behaviors. Real implementation is given to verify how the proposed approach can reduce time and effort and also how it could be utilized to general cases.
홍상현(Sang-Hyun Hong),이영신(Young-Sin Lee),진승균(Seung-Kyun Jin) 대한기계학회 2015 대한기계학회 춘추학술대회 Vol.2015 No.11
In this study, guardrail performance was investigated by impact analysis. The analysis of guardrail was conducted by LS-DYNA. HYPER-MESH was used as pre-processor. Guardrail that is SB4 grade consist of rail, damper and post. 3D modeling of Guardrail was carried out by CATIA. The finite element model of vehicle was provided from NCAC. The analysis conditions were chosen from Regulation of Ministry of land Infrastructure and Transport. When crushing with vehicle, the max displacement of guardrail was 206 ㎜ and max acceleration of vehicle was 13.8 g. These results of analysis satisfied Regulation of Ministry of Land Infrastructure and Transport.