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순간전압변동 보상 기능을 갖는 3상 하이브리드형 직렬 능동전력필터
한석우,최규하 전력전자학회 2000 전력전자학회 논문지 Vol.5 No.6
In this paper, 3-phase hybrid series active power filter for compensate current harmonics, voltage drop and unbalanced voltage in the network presented. The proposed system is implemented with a space vector modulation voltage source inverter and a high pass filter connected in parallel to the power system. Here the load is six-pulses thyristor rectifier. The phase angle detected in order to generation reference voltage at load terminal is synchronized with the positive sequence component of the unbalanced source by using symmetrical component transformation. The proposed system has an function harmonic isolation between source and load, voltage regulation, and unbalance compensation. Therefore, what the power system is improved quality, the source current is maintained as a nearly sinusoidal waveform and the load voltage is regulated with a rated voltage regardless of the source variation condition. To verify the validity of the proposed compensating system, the computer simulation and experiment are carried out.
철도역 사인의 가독성과 픽토그램의 인지성 증대에 관한 연구
한석우,진미자 한국철도학회 2003 한국철도학회논문집 Vol.6 No.1
Railway sign(graphic sign, diagraphics) designs require good recognition with universality to transmit accurate and speedy information as they connect people around the station and other transport systems.An important point of signs is how to design and deliver the contents to the viewers as a communication service tools. It needs to establish design guidelines with standardization and unified system to show their contents and images clearly like common language with visuality, attractivity and generality. These requisites are important for both aesthetics legibility and unified standards to maximize the effectiveness of pictograms for the use of the general public, who require systematic suggestion and management.
한석우,진미자 한국철도학회 2002 한국철도학회논문집 Vol.5 No.4
This study suggests a new paradigm to build the identity of railway culture design, since it plays a critical role in enhancing competitiveness of culture and design. It is considered to be a valuable factor to improve users' satisfaction and to have a new effect on the railway industry.This study is focused on systematic study on the culture & design and competitiveness for railway industry, that emphasizing on making necessary strategic scenarios accordingly.Consequently, it is going to make higher added values to secure a footing and advanced images of railway industry.