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Sangjoon Ann,Won-Jin Son,Jongeun Byun,Jae Han Lee,Byoung Kuk Lee 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5
This paper proposes a switch design method for a high-speed switching semi-bridgeless active rectifier (SBAR) which is used for the secondary side of an inductive power transfer (IPT) system for electric vehicles (EVs). In addition to the rated voltage and current, two practical design considerations are proposed through analyzing operation modes of SBAR in consideration of reverse recovery phenomenon in a body diode of the switch. Based on the analysis, the requirements of the switch for SBAR are proposed, and three types of switches with different characteristics are compared. In order to design the final switch for SBAR, experiments using a 3.3 kW IPT system prototype are performed while applying the three switches, and the final switch is designed.
안상준(Ann Sangjoon),이승로(Lee Seungro),김진철(Kim Chinchol),한선영(Han Sunyoung) 한국정보처리학회 1998 정보처리학회논문지 Vol.5 No.5
In this paper, we implemented a system which provides more effective conference control than that of video conferencing system has been used on MBone. The system provides multicast service on the non-broadcasting network. It multicasts multimedia data using several MTS(Multipoint Transport Server)s and provides a tightly coupled conference control service with a CCS(Conference Control Server). As providing a tightly coupled conference control service, we can perform effectively video conferencing using this system.
Response surface modeling-based analysis on launch vehicle capability
Ann, Sungjun,Cho, Namhoon,Kim, Youdan,Shin, Sangjoon,Ahn, Jaemyung Elsevier 2018 ADVANCES IN SPACE RESEARCH Vol.62 No.12
<P><B>Abstract</B></P> <P>This paper proposes a framework to analyze the capacity of a launch vehicle systematically. Important mission requirements and flight parameters that influence the payload capacity of a given launch vehicle configuration are identified. The response surface models (RSM; the “analyzer”) for the launch capacity, coasting/burning arcs, and the velocity increment elements are developed. A series of trajectory optimization results, which are obtained with the “optimizer”, are used to determine the coefficients of the models. The case study to analyze the capacity of a low Earth orbit (LEO) launch vehicle configuration is conducted to demonstrate the validity of the proposed framework.</P>
Jae Han Lee,Won-Jin Son,Sangjoon Ann,Jongeun Byun,Byoung Kuk Lee 전력전자학회 2019 ICPE(ISPE)논문집 Vol.2019 No.5
In this paper, a pulse density modulation (PDM) control for a semi-bridgeless rectifier in inductive power transfer (IPT) systems is proposed. The proposed PDM control can implement soft switching and continuous output voltage control using simple algorithm without additional hardware. In order to analyze the proposed method, the voltage gain of the semi-bridgeless rectifier with the proposed method is derived mathematically, and the performance of the proposed method is compared with the conventional control methods. Additionally, the result of the comparison is verified through simulation and experimental results.
초기 설계 단계 우주 발사체의 포고 현상 예측을 위한 시스템 구성과 안정성 해석
심지수(JiSoo Sim),이상구(SangGu Lee),신상준(SangJoon Shin),서용준(Yongjun Seo),안성준(Sungjun Ann),송희성(Huiseong Song),김유단(Youdan Kim) 한국추진공학회 2016 한국추진공학회 학술대회논문집 Vol.2016 No.12
우주 발사체에서 발생하는 다양한 다분야 연계 문제 중 하나인 축방향 동적 불안정성 현상인 포고현상에 관한 연구를 수행하였다. 구조, 공급계, 추진 시스템의 연성에 의한 현상으로 구조 시스템과 추진 시스템이 닫힌계 시스템을 구성하여 전체 반응이 증폭하는 불안정성이 나타난다. 우주 발사체 개발에서 포고 현상에 대한 예측과 억제는 필수적이다. 따라서 포고 현상의 시스템 구성과 이를 해석하기 위한 방법에 대한 연구를 진행하였으며 이를 위하여 우주왕복선의 사례와 연구 방법을 참고하여 검증, 발전시키고자 하였다. This research is about pogo phenomenon which is one of the problems in the space launch vehicle caused by coupling within various disciplines. This phenomenon is a coupling of structure, feedlines, and propulsion system regarding the coincidence of the natural frequencies. Then, the system becomes closed-loop composed of the structural and propulsion system. In order to predict of the relevant pogo instability, an example of the space shuttle is analyzed.