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LTCC 기술을 이용한 bluetooth/WiFi 이중모드 무선 전단부 모듈 구현
함범철(Beomcheol Ham),유종인(Jong In Ryu),김준철(Jun Chul Kim),김동수(Dongsu Kim),박영철(Youngcheol Park) 한국전자파학회 2012 한국전자파학회논문지 Vol.23 No.8
본 논문에서는 저온 동시 소성 세라믹(Low Temperature Co-fired Ceramic: LTCC) 기술을 사용하여 블루투스와 WiFi에서 동작하는 무선 전단부 모듈(RF Front-end Module)을 설계, 구현하였다. 무선 전단부 모듈은 2.4/5 ㎓ 대역 발룬, 5 ㎓ 대역 발룬, 그리고 송·수신용 SPDT 스위치로 구성되어 있다. LTCC의 설계에 있어, 적층 구조의 특성으로 인해 발생되는 예상 기생 성분은 시뮬레이션을 할용하여 설계하였다. 제작한 무선 전단부 모듈은 내부 접지(inner ground) 3개 층을 포함하여 총 13개 패턴으로 구성되었으며, 무선 전단부 모듈의 크기는 3.0 ㎜×3.7 ㎜×0.6 ㎜이다. This paper presents a compact bluetooth/WiFi dual-mode dual-band RF front-end module(FEM) is realized by low temperature co-fired ceramic(LTCC) technology. The proposed RF front-end module consists of a diplexer, baluns in the LTCC substrate, and an SPDT switch, an SP3T switch on the LTCC substrate. In order to reduce the module size and increase integration level, the proposed diplexer and balun are designed using LC lumped elements. The parasitic elements caused by coupling effect between metal pattern layers and ground plane layer are considered during the design. The fabricated dual-mode RF front-end module has 13 pattern layers including three inner ground layers and it occupies less than 3.0 ㎜×3.7 ㎜×0.66 ㎜.
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데이터 기반 모델 및 물리 기반 모델 연동 터보차저 엔진 디지털트윈 개발 연구
최요나단(Yonadan Choi),윤성준(Sungjun Yoon),이병일(Byoungill Rhee),김탁곤(Tag Gon Kim),함범철(Beomcheol Ham),이재영(Jaeyoung Lee) 대한산업공학회 2024 대한산업공학회 춘계학술대회논문집 Vol.2024 No.5
As internal combustion engine consists of several components such as turbocharger, cylinder and others, simulating a running engine in digital environment is challenging. In this study, the dual fuel engine named as HiMSEN Engine made by HD Hyundai Heavy Industries In is modeled for engine digital twin development. The representative components (Turbocharger, control units, cylinder, and exhaust) which participate in running loop of an engine are sorted out. Sorted out components are modeled either by data-driven method or by physics based method. A rotation of turbocharger main shaft is modeled with physics based model. On the other hand, particular parts of a turbocharger, a compressor and turbine, are modeled to calculate fluid properties with a data map provided by manufacturer. Control units are modeled to conduct a PID control at the valves. The other components are modeled by data-driven method. Finally, the simulator for engine digital twin is developed by combining component models and the simulator is verified in several conditions to confirm feasibility of linkage between data-driven models and physics based models. It is expected that the developed simulator would play a key role in the engine digital twin as the simulator is run with real values measured or set in a real ship.
ScienceON
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