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대용량 병렬 양방향 컨버터를 이용한 배터리 충ㆍ방전기 해석
최재동(Jae-dong Choi),안재황(Jae-whang Ahn),성세진(Se-jin Seong) 전력전자학회 2002 전력전자학술대회 논문집 Vol.- No.-
The battery charger of spacecraft has two different modes of operation respectively One is the bus voltage regulation mode and the other is the charge current regulation mode And also the battery discharger provide the power during eclipse mode of spacecraft.<br/> In this study, a test model of the battery charger and discharger using bi-directional converter are designed and analyzed .These Battery Charger and Discharger is introduced the modular converter method that can be added the converter modules according to the load variation
최재동(CHOI Jae-Dong),구자춘(KOO Ja-Chun),박종석(PARK Jong-Seok),양군호(Yang Koon-Ho) 대한전기학회 2008 정보 및 제어 심포지엄 논문집 Vol.2008 No.1
This paper defines the electrical interfaces and limited items to integrate Ka-band communication payload on the satellite system, which includes the detailed interfaces such as bus voltage and data bus according to the related COMS requirements. And the BUS Electrical Interface Simulator introduces to use during the course of validating and accepting between the KA-Band payload and their EGSE. These interface design results are fully validated through the testing with the BEIS and is compliant with the satellite interface control interface requirements.
최재동(Jae-Dong Choi),조창권(Chang-Kwon Cho),강금실(Gum-Sil Kang) 한국항공우주연구원 2006 항공우주기술 Vol.5 No.1
본 연구에서는 해양탑재체의 고장모드 영향분석 및 신뢰성 예측결과가 제시되었다. 해양탑재체는 한반도 해역을 약 500m 급의 공간분해능을 갖는 8개 가시광선 대역 채널을 통해 관측한다. 해양탑재체를 구성하는 서브 구성품들의 안정성과 신뢰성 확보를 위해 부품별 고장검출영향분석이 수행되었다. 또한 기능 고장이 시스템과 위성체에 미치는 영향에 대해 분석되었다. 시스템의 복잡성을 설명하기 위하여 다른 관측위성에 사용된 유사 부품들을 통해 신뢰성 예측결과가 제시되었다. This paper presents Failure Mode Effect Analysis (FMEA) and Reliability Expectation at GOCI system level. The function of Gael payload is to acquire data in 8 visible spectral bands with a spatial resolution of about 500 m over the Korean sea. For stability and reliability of the subsystems making up the GOCI, a functional FMEA is performed and each functional failure is studied in terms of functional effect on the system. The reliability performances are expected through the similar equipments used on other earth observation spacecrafts in order to take into account the complexity of the considered item.
최재동(Choi Jae-dong),홍순태(Hong Soon-Tae) 한국콘텐츠학회 2003 한국콘텐츠학회 종합학술대회 논문집 Vol.1 No.2
이 논문에서는 우주의 진화와 관련하여 미분이 불가한 여러 시점을 포함한 경우의 곡률을 계산하기 위하여 비틀림적 공간에 적용하여 프리이드만 로버트슨워커의 우주모델을 연구하였다. 특히 천체 물리학적인 관점에서 본 복시-물질우세기, 물질-우주상수 우세기의 두점을 포함한 경우의 곡률을 계산하였다. In the framework of Lorentzian warped products, we study the Friedmann-Robertson-Walker cosmological model to investigate non-smooth curvatures associated with multiple discontinuities involved in the evolution of the universe. In particular we analyze non-smooth features of the spatially flat Friedmann-Robertson-Walker universe by introducing double discontinuities occurred at the radiation- matter and matter-lambda phase transitions in astrophysical phenomenology.
통신방송위성 전력시스템의 Energy Balance 해석
최재동(Jae-dong Choi),구철회(Cheol-hea Koo) 전력전자학회 2001 전력전자학술대회 논문집 Vol.2001 No.7
In the power system of a satellite, solar array and a battery have directly impact on the life time of the satellite, and their stable operation is decided by whether their states are in the steady state operation or not.<br/> In this study, solar array capacity and battery characteristics of proposed communication satellite are designed and simulation is conducted according to the operation mode. Each operation mode is classified as the normal and worst case modes, respectively. The normal mode is analyzed under daylight and the eclipse with the EHT bum, and the worst case modes which have solar cell circuit failure, and battery cell failure are analyzed too.
자속 모델 기준 추종방식을 이용한 SRM 회전자 위치평가알고리즘 비교
최재동(Jae-dong Choi),안재황(Jae-hwang An),황영성(Young-seong Hwang),성세진(Se-jin Seong),오인석(In-seok Oh) 전력전자학회 2000 전력전자학술대회 논문집 Vol.2000 No.11
This paper introduces a new rotor position estimation algorithm for the SRM, based on the magnetizing curves of aligned and unaligned rotor positions The flux linkage is calculated by the measured data from phase voltage and phase current, and the calculated data are used as the input of magnetizing profiles for rotor position detection. Each of the magnetizing profiles consisted of the methods using the neural network and fuzzy algorithm.<br/> And also, the optimal phase is selected by phase selector. To demonstrate the promise of this approach, the proposed rotor position estimation algorithms are verified by the experiment results for variable speed range