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스마트 제조 실행 시스템 기본설계를 위한 시스템 엔지니어링 적용 방법에 대한 연구
전병우,신기영,홍대근,서석환,Jeon, Byeong-woo,Shin, Kee-Young,Hong, Dae-Geun,Suh, Suk-Hwan 한국시스템엔지니어링학회 2015 시스템엔지니어링학술지 Vol.11 No.2
Manufacturing Execution System(MES) is in charge of manufacturing execution in the shop floor based on the inputs given by high level information such as ERP, etc. The typical MES implemented is not tightly interconnected with shop floor control system including real (or near real) time monitoring and control devices such as PLC. The lack of real-time interfaces is one of the major obstacles to achieve accurate and optimization of the total performance index of the shop floor system. Smart factory system in the paradigm of Industry 4.0 tries to solve the problems via CPS (Cyber Physical System) technology and FILS (Factory In-the-Loop System). In this paper, we conducted Systems Engineering Approach to design an advanced MES (namely Smart MES) that can accommodate CPS and FILS concept. Specifically, we tailored Systems Engineering Process (SEP) based on an International Standard formalized as ISO/IEC 15288 to develop Stakeholders' Requirements (StR), System Requirements (SyR). The deliverables of each process are modeled and represented by the SysML, UML customized to Systems Engineering. The results of the research can provide a conceptual framework for future MES that can play a crucial role in the Smart Factory.
지형 정보를 이용한 상용 수소전기차의 연료전지 발전 제어 전략
전병우(Byungwoo Jeon),김영광(Youngkwang Kim),박재희(Jaehee Park) 한국자동차공학회 2023 한국자동차공학회 학술대회 및 전시회 Vol.2023 No.11
When designing power generation control logic for commercial Fuel-Cell Electric Vehicle (FCEV), there is an important difference compared to passenger FCEV. Due to the heavy weight of vehicle, e.g., up to 40 ton, a large amount of electric energy is required compared to that of passenger FCEV. However, the current Fuel-cell system applied in commercial vehicle can generate approximately maximum output power of 160 kW whereas the traction motor system of heavy duty truck/bus requires maximum output power of 330 kW. Thus, it is necessary to save electric energy into high voltage battery in low energy driving condition, i.e., normal condition or downhill, and to take out the saved battery energy in high energy driving condition, i.e., uphill. Previously, the fuel-cell power generation control was based on the instantaneous vehicle demand power. Therefore, if the vehicle was driving in high energy road for a long time, e.g., 20 min, it would cause the electrical system failure and vehicle shutdown due to low state of charge of battery (SOC) because the energy saved in battery is not enough to overcome the high altitude of the region. To solve this problem, the current paper introduces Fuel-cell power generation control strategies using altitude estimation and topographic information. First, for a vehicle without GPS sensor, this paper proposes the power generation logic of compensating the previous altitude changes estimated with an accelerometer. Second, for a vehicle has GPS sensor, a method of predicting maximum and altitude of preselected high energy region is introduced, and based on that a new power generation logic adjusts fuel-cell power generation considering both the instantaneous vehicle demand power and the gap between the current altitude and the maximum altitude of the region. This paper presents numerical simulation results on two high energy driving scenarios. It is shown that new power generation logics can effectively prevent the vehicle’s electrical system failure, and the SOC is managed in a preferable range.
시간적 계층에서의 스케일러블 부호화 고속 모드 결정 방법
전병우(Jeon, Byeungwoo) 한국정보전자통신기술학회 2013 한국정보전자통신기술학회논문지 Vol.6 No.2
최근의 멀티미디어 서비스 환경은 다양한 전송 속도, 영상 크기나 화질을 지원하고 있다. 그러나 고정된 영상크기 또는 화질로의 부호화만이 가능한 기존의 비디오 부호화 기술은 새로운 멀티미디어 서비스 환경을 충족시키기가 어렵다. 따라서 새로운 환경적 요구를 충족시키기 위해 기존의 H.264/AVC 표준을 기반으로 다양한 영상크기와 화질을 지원할 수 있는 새로운 비디오 부호화 표준인 H.264/AVCSE(Scalable Extension)의 표준화가 진행되었다. H.264/AVC SE은 한번의 부호화된 스트림으로 다양한 크기나 화질을 가진 여러 개의 영상을 제공할 수 있다. 하지만 이를 위하여 기존의 H.264/AVC 표준에 비해 보다 복잡도가 요구되어 지기 때문에 이를 효과적으로 감소시킬 수 있는 추가적인 기술이 제공되어야한다. 본 논문에서는 H.264/AVC SE 표준이 가지는 복잡도 중 대부분을 차지하는 모드 결정법의 복잡도를 감소시키기 위해 이전과 이후 픽춰의 참조모드를 이용하는 early skip 알고리즘과 GOP내에 존재하는 모드들의 History를 이용하는 MHM(Mode History Map) 알고리즘을 이용한 고속모드 결정법을 제안한다. Recently proliferating heterogeneous multimedia service environments should be able to deal with many different transmission speeds, image sizes, or qualities of video. However, not many existing video compression standards satisfy those necessities. To satisfy the functional requirements, the standardization of the H.264/AVC Scalable Extension (SE) technique has been recently completed. It is an extension of the H.264/AVC which can encode several image sizes and qualities at the same time as a single bitstream. To perform optimum mode decision, motion estimation is performed for all MB modes, and the RD costs are compared to identify an MB mode with the smallest RD cost. This increases computational complexity of H.264/AVC SE encoding. In this paper, we propose an early skip mode detection scheme to reduce candidate modes and suggest an algorithm of fast mode decision utilizing reference modes according to the mode history.