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김병걸,김상수,박주환,Kim, Byung-Geol,Kim, Shang-Shu,Park, Joo-Hwan 한국전기전자재료학회 2005 전기전자재료학회논문지 Vol.18 No.12
New conductor is developed by using high strength nonmagnetic steel(NM) wire as the core of overhead conductor. This conductor is called ACNR overhead conductor(Aluminum Conductor Nonmagnetic Steel Reinforced). Formed by the combination of aluminum alloy wire and high strength nonmagnetic steel wire, it has about the same weight and diameter as conventional ACSR overhead conductor. To enhance properties beneficial in an electrical and mechanical conductor during the process of high strength nonmagnetic steel wire, we made a large number of improvements and modifications in the working process, aluminum cladded method, and other process. ACNR overhead conductor, we successfully developed, has mechanical and electrical properties as good as or even better than conventional galvanized wire. Microstructure of raw material M wire was austenite and then deformed martensite after drawing process. Strength at room temperature is about $180kgf/mm^2\~200kgf/mm^2$. NM wire developed as core of overhead conductor shows heat resistant characteristics higher than that of HC wire used as core of commercial ACSR overhead conductor, Strength loss was not occur at heat resistant test below $600^{\circ}C$. Fatigue strength of vibration fatigue is about $32kgf/mm^2\~35kgf/mm^2$ and that of tension-tension fatigue is $90kgf/mm^2\~120kgf/mm^2$ which is $50\~65\%$ of tensile strength.
고강도 저손실 가공송전선의 개발(II) - 전기적 특성
김병걸,김상수,박주환,Kim, Byung-Geol,Kim, Shang-Shu,Park, Joo-Hwan 한국전기전자재료학회 2005 전기전자재료학회논문지 Vol.18 No.12
New conductor is developed by using high strength nonmagnetic steel(NM) wire as the core of overhead conductor This conductor is called ACNR overhead conductor(Aluminum Conductor Nonmagnetic Steel Reinforced). Formed by the combination of aluminum alloy wire and high strength nonmagnetic steel wire, it has about the same weight and diameter as conventional ACSR overhead conductor. To enhance properties beneficial in an electrical and mechanical conductor during the Process of high strength nonmagnetic steel wire, we made a large number of improvements and modifications in the working process, aluminum cladded method, and other process. ACNR overhead conductor, we successfully developed, has mechanical and electrical properties as good as or even better than conventional galvanized wire. Microstructure of raw material NM wire was austenite and then deformed martensite after drawing process. Strength at room temperature is about $180kgf/mm^2\~200kgf/mm^2$. The conductivity at 0.78 mm thickness of Aluminum cladded M wire is about $7\%$ IACS higher than $20\%$IACS of HC wire used as core of commercial ACSR overhead conductor. The corrosion resistance is about 3 times higher than that of HC wire.
ROS 기반 이동 로봇 강화학습을 위한 시뮬레이션 환경 구축
오세현(Se-Hyeon Oh),박주환(Joo-Hwan Park),최홍용(Hong-Yong Choi),옥승호(Seung-Ho Ok) 한국정보기술학회 2022 Proceedings of KIIT Conference Vol.2022 No.12
최근 실내 이동 로봇 등 로봇의 자율주행에 관한 연구가 활발히 이루어지고 있으며 일반적으로 SLAM을 통한 맵 제작 후 네비게이션을 수행하는 방법이 주로 사용된다. 하지만 해당 방법은 새로운 환경에서 매번 맵핑을 해야 한다는 한계점이 있어 강화학습을 이용한 Mapless Navigation에 관한 연구가 증가하고 있다. 본 논문에서는 가상 시뮬레이션 툴인 Unity와 강화학습 플러그인인 ML-Agents를 기반으로 이동 로봇 강화학습 알고리즘을 구현하고 현실 로봇에 적용을 위해 ROS(Robot Operating System) 기반 모바일 로봇인 Turtlebot3 및 Unity 간의 통신환경을 구축하였다. 실험 결과 DDPG(deep deterministic policy gradient) 알고리즘으로 모바일 로봇을 강화 학습하여 보상 값의 수렴성을 통해 학습의 유효함을 확인하였고 ROS 기반 Turtlebot3와 통신하여 정상적으로 동작함을 확인하였다. Recently, research on autonomous driving of robots such as indoor transfer robots has been actively conducted, and in general, a method of performing navigation after making a map through SLAM is mainly used. However, this method has a limitation in that it must be mapped every time in a new environment, so research on Mapless Navigation using reinforcement learning is increasing. In this paper, we implement a mobile robot reinforcement learning algorithm based on the virtual simulation tool Unity and the reinforcement learning plug-in ML-Agents, and establish a communication environment between Unity and Turtlebot3, a ROS-based mobile robot, for application as a real robot. Experiments confirmed that the mobile robot is effective through convergence of reward values by reinforcing learning with a deep deterministic policy gradient (DDPG) algorithm, and that it operates normally by communicating with ROS-based Turtlebot3.
기술집약형 항공엔진 정비산업과 부품인증제도에 관한 고찰
이강이(Kang-Yi Lee),박주환(Joo-hwan Park) 한국추진공학회 2017 한국추진공학회 학술대회논문집 Vol.2017 No.5
미국과 유럽은 대형 항공기 산업을 선도하고 있으며, 아시아-태평양 지역에서는 물동량이 증가하면서 운송산업과 정비산업이 크게 발전할 것으로 전망된다. 또한, 일본과 중국은 중소형 항공기 분야에서 설계 제작국에 진입하였으며, 후발국가의 정비산업도 경쟁이 더욱 가속되고 있다. 향후 10년간 세계의 항공기 정비산업은 연평균 3.4%로 성장하고, 엔진 정비산업은 7%씩 성장할 것으로 전망된다. 본 논문을 통하여 고부가가치를 창출할 수 있는 기술집약형 항공엔진 정비산업 육성 방안을 제시하고자 한다. USA and Europe are leading a transport airplane industry. In Asia-Pacific region, air transportation and MRO industries are forecasted to be grown up rapidly. Furthermore, Japan and China entered into design and manufacture state of regional airplane, and developing countries entered into severe struggle competition for MRO industry. Global aircraft MRO and engine MRO industries are forecasted 3.4% and 7% growth respectively in next decade. In this paper, authors propose promotion strategy for technology intensive MRO of aircraft engine to create a higher value-added business.