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위성 SAR 모듈화 구현을 위한 전원회로 설계 및 해석
박성우(S.W.Park),장진백(J.B.Jang),박희성(H.S.Park),장성수(S.S.Jang) 전력전자학회 2003 전력전자학술대회 논문집 Vol.2003 No.7(1)
KOrea Multi-Purpose SATellite (KOMPSA T) uses software-controlled unregulated bus system m which the main bus is directly connected to a battery and the duty-ratio for PWM switch is generated by the on-board satellite software algorithm. In this paper, we propose a new power-stage circuit that can be available for modularization of a solar array regulator(SAR) which is used in the KOMPSAT. The operations at each mode and current sharing characteristics of the power-stage are analyzed and verified by simulation and experiments on a prototype converter<br/>
박성우(S. W. Park) 한국재활복지공학회 2015 한국재활복지공학회 학술대회논문집 Vol.2015 No.11
This paper presents comparison of policies in EU by exploring laws, regulations as well as guidelines related to ICT accessibility including web accessibility. EU and European states have investigated and carried out these subject policy issues and this study attempts to provide updated recent information on the efforts of EU as well as UK to make better the situations of the persons with disabilities and similarly-situated adults so they can be helped to better access to information and communication technology and services on an equal basis with others and participate fully in their society.
국부 임계치를 반영한 슬로싱 수반 대형 유탄성 해석 기법에 관한 연구
박성우(S. W. Park),조진래(J. R. Cho) 대한기계학회 2006 대한기계학회 춘추학술대회 Vol.2006 No.11
There exist many researches to solve the fluid-structure interaction(FSI) problems. However, these methods require very fine mesh to achieve the reasonable numerical accuracy and stability due to the concentrated and volatile hydrodynamic pressure caused by the liquid sloshing. Consequently, the numerical analysis targeting for the long-period time response with the desired numerical accuracy is very highly time-consuming. The aim of this paper is to suggest a new method to analyze the sloshing behavior of the FSI system by using the local critical results of the rigid sloshing. This method can reduce the analysis time in considering the fluctuation in the responses at the initial analysis step. At first, the propriety of the presented method is verified, moreover, according to the analysis method, the local responses of the large FSI system are efficiently acquired only with small increase of computation time.
국부 상세 단열 구조 모델을 이용한 LNG 운반선 화물창의 해석
박성우(S. W. Park),조진래(J. R. Cho) 대한기계학회 2005 대한기계학회 춘추학술대회 Vol.2005 No.11
There are many numerical methods to solve the fluid-structure interaction(FSI) systems. However, these methods require very fine mesh to attain the numerical accuracy and stability owing to the concentrated and fluctuating sloshing hydrodynamic pressure. As a result, the numerical analysis targeting for the long-period time response with the desired accuracy is highly time-consuming. The aim of this paper is to present a new method to analyze the sloshing behavior of the LNG containment by using the locally detailed model. According to the global-local analysis method, the local responses of the LNG containment are efficiently obtained only with small increase of computation time.
박성우(S.W.Park),전중함(J.H.Chun),백종현(J.H.Peak),곽동걸(D.K.Kwak),우정인(J.I.Woo),이현우(H.W.Lee) 전력전자학회 1999 전력전자학술대회 논문집 Vol.- No.-
Multi-Combination type converter has been Proposed in order to Larger capacity control sin wave of input currency from AC-DC Converter.In this paper, I wish to propose Multi-Level<br/> PWM control type converter In main body 1.1.1. explains the composition of converter combined with M quantity, and how to combine the input currency control.<br/> In 2.1, I wish to look for the combination method or best combined quantity of circuit by examining theoretically available method of combination and propriety of high frequency interpretation through simulation.
전자교환기용 고효율 48V 400A급 전력변환장치의 시작
박성우(S W Park),서기영(K Y Suh),전중함(J.H.Chun),김부국(B K Kim),이현우(H W Lee) 전력전자학회 1998 전력전자학술대회 논문집 Vol.- No.-
The widely used power supply (Switched Mode Power Supply: SMPS) as a source in order to stabilize direct current for electronics or communication systems has merits, when it is compared to the existing source for stability, such as high efficiency.<br/> small size. light weight by means of switching process of the semiconductor device which controls the flow of power.<br/> However. due to existence of inductors and capacitors used for charging energy. the source part in electronic or communication systems hasn't reached the speed. that is supposed to get. for achieving smaller size and lighter weight.<br/> In order to get smallness in size. It is ne-cessary to increase switching frequency. And that makes devices for measuring energy smaller.<br/> Nevertheless. the rise switching frequency brings increases in switching loss. inductor loss. and power loss Also. the occurrence of surge and noise caused by high frequency switching is getting higher.<br/> The resonant converter has been considered as one of methods that give solutions for the problems of SMPS and that method has been paid attention as a source technology in electronics and communication.