• The Transactions of the Korean Institute of Power Electronics
• /
• v.5 no.4
• /
• pp.377-385
• /
• 2000

This paper presents the test and operation results of the domestic demonstration of the reactive power compensation device called STATCOM (STATic COMpensator). The object of the paper is to describe the reliability of the unit based on the extensive operation databases. The custom power is similar in nature to the concept of FACTS(Flexibel AC Transmission System). By controlling reactive power, the technology offers utilities the opportunity for increased efficiency and their capabilities will permit transmission planners make the best use of their existing transmission resources. STATCOM is a custom power device in a way and can be used in a similar way for the dynamic compensation of power transmission systems, providing reactive power compensation, voltage regulation and mitigation of voltage flicker. It is shown that the STATCOM has clear advantages in areas such as; providing reactive power compensation and improving power factor.

• Transactions of the Korean Society for Noise and Vibration Engineering
• /
• v.14 no.10
• /
• pp.999-1006
• /
• 2004

Recently, the ride comfort problem becomes increasingly important because of today's needs for train speedup. The railway has the track irregularities which cause vibrations, such as rail joints, turnout, level crossing, transition corves and super-elevation ramps, and variations in the track level(z-axis) and the gauge(y-axis). In Korea, the service run of the high speed train has been made since the 1st of April, 2004. The commercial high-speed trains must be run on the compound lines which are composed of high-speed line and conventional line. The high speed lines in both Kyoungbu line and Honam line have 57.5％ and 33.8％, respectively In this Paper, the ride comfort has been reviewed by the various experimental methods when the high-speed trains are operated on both Kyoungbu line and Honam line. The results show that the high-speed train has no problems from the viewpoint of the comfort ride during the operation on the high speed line and conventional line.

• Journal of the Korean Society of Fisheries and Ocean Technology
• /
• v.37 no.4
• /
• pp.308-312
• /
• 2001

This study was carried out to develop a basic form of planning hull type fishing boat. G/T 10ton class is selected as object hull form, and hull form is designed in Chosun University. A series of test results of LCG variations for S different LCG points are presented in this paper. The test was performed in Davidson Laboratory, and the scope of tests include resistance, trim and sinkage.

• Journal of Sensor Science and Technology
• /
• v.14 no.3
• /
• pp.144-149
• /
• 2005

In this paper, we introduce the variation of ride characteristics for HSR 350x(Korea High Speed Train project) through on-line test during about 3 years. The concept of term "ride comfort" is equivocal. Generally it is evaluated as the vehicle vibration. The ride comfort for HSR 350x has been assessed by statistical method according to UIC 513R. The testing results show that HSR 350x has no problems from the viewpoint of the comfort ride on the high speed line and conventional line and that 1st and 2nd suspensions play an important role in the ride characteristics for high speed train.

• Proceedings of the KIEE Conference
• /
• 2006.07b
• /
• pp.1145-1146
• /
• 2006

분산 형 전원 및 석탄 가스화와 연계한 복합 발전이 가능한 용융탄산염 연료전지(MCFC : Molten Carbonate Fuel Cell)는 천연가스, 석탄가스 등 다양한 연료를 사용할 수 있고, 공해요인이 적고, 높은 에너지 변환효율을 가지고 있어 전력사업 분야에 적용 가능성이 가장 큰 새로운 발전방식이다. 국내에서도 1993년부터 선도기술개발 사업의 하나로 시작하여 현재 250 kW급 발전시스템 개발 연구가 진행되고 있다. 250 kW개발 전 수행한 100 kW급 MCFC 발전 시스템 개발 연구에서는 6,000cm2 급 단위전지 90장으로 구성된 50 kW급 MCFC 스택 2기 로 구성된 100 kW MCFC 스택과 이를 운전 평가를 위한 시스템을 완성하였다. 2005년부터 스택운전에 필요한 시스템 내 단위기기들에 대한 시운전을 진행 한 후 장착된 100 kW MCFC 스택 운전에서는 시스템 단위 기기의 고장으로 전 부하운전을 실시하지 못했지만 상압 상태에서 AC 50 kW 전력을 계통과 연계 운전 시험을 진행하였다. 향후 100 kW MCFC 시스템 보완후 재 운전 시험을 진행할 예정이다. 한편 병행하여 진행되는 250 kW 열병합 발전 시스템 개발에서는 시스템 상세설계 및 신형 분리판을 이용한 새로운 형태의 스택을 개발 운전시험을 진행하고 있다. 여기에서는 MCFC 발전 시스템의 개요와 시스템의 운전을 위한 운전 모드 그리고 스택 운전 내용을 요약하여 소개하고자 한다.

• Journal of the Society of Naval Architects of Korea
• /
• v.44 no.6
• /
• pp.572-578
• /
• 2007

A Rigid Inflatable Boat (RIB) is now widely used for commercial and military purpose. In this paper, it is supposed that seven-meter-class RIB be used as an unmanned target ship for naval training. In order to develop many tactical maneuvering patterns of a target ship, a simple horizontal maneuvering model of a RIB is needed. Therefore, models of speed and yaw rate are constructed as the first-order differential equations based on Lewandowski#s empirical formula for steady turning circle diameter of a conventional planning hull. Some parameters in the models are determined using the results of sea trial tests. Finally, proposed models are validated through the comparison of the simulation result with the sea trial result for a specific scenario. Even though a simple model does not represent the horizontal motion of a RIB precisely, however, it can be used enough to develop tactical trajectory patterns.

• Proceedings of the KSR Conference
• /
• 2008.06a
• /
• pp.1039-1044
• /
• 2008

By the result of efforts for the technology development of G7 trainset, the technology of domestic high-speed train KTX-II has lately been put to practical use while a forward countries of railway, which have their own developing ability of high-speed train, are competing against each other for the development of faster high-speed train system. Japan has been commissioning of FASTECH 360 which was developed in June 2005. Also France and Germany have been commissioning of next generation high-speed train such as AGV and ICE-3, developed basing on technology of their existing high-speed train system(TGV and ICE), its maximum commercial running speed is 360kph, and adopted multiple unit system. For the development of technology of domestic high-speed train and enhancement of national technology competitive power, HEMU (High-speed Electrical Multiple Unit) development project has been carried out as a national R&D project from last August. For the executing of HEMU's maximum speed test, we have investigated the high speed line characteristics (i.e. radius of curvature, gradient, cant etc.) of Seoul-Pusan line and Honam line which is under construction. We'd like to examine a study of condition for the best HEMU T&C line considering HEMU's characteristics (i.e. acceleration, deceleration etc.) and its interface with infrastructure in this paper.

• Proceedings of the KIEE Conference
• /
• 2003.07a
• /
• pp.166-168
• /
• 2003

전력계통의 안정운용을 위하여 대용량 발전소와 주요 345kV 전력소로부터 시각 동기화된 계통 운전자료를 온라인으로 취득하여 계통 안정성을 실시간으로 감시, 분석할 수 있는 전력계통 온라인 안정성 감시, 분석시스템을 개발하였다. 전력계통 온라인 안정성 감시, 분석시스템은 크게 Master 시스템과 Local 시스템으로 구성된다. Local 시스템은 시각동기 데이터 취득시스템(TSDS)이라고도 하는데, GPS를 이용한 시각 동기화된 계통 운전데이터를 측정하고, 지역사고 판단 및 사고데이터를 기록하며, 측정/기록데이터를 Master 시스템으로 온라인 전송해주는 역할을 한다. Master 시스템은 각 Local 시스템에서 전송되어진 측정/기록데이터를 수집하고, 광역사고 판단 및 사고데이터를 기록하며, 과도안정도를 온라인으로 평가해주는 역할은 한다. 현재 1단계 연구결과로서 울진, 영광, 고리 원자력발전소와 동서울,신제천,청양,아산,신옥천 전력소 등 총 8개소에 Local 시스템 설치 및 시운전이 완료되었고, 한국전력거래소(KPX)에 설치된 Master 시스템을 이용하여 TSDS의 확대적용을 위한 활용성 검증작업을 진행하고 있다.

• The Transactions of The Korean Institute of Electrical Engineers
• /
• v.65 no.5
• /
• pp.902-910
• /
• 2016

This paper presents the overall measurement system for on-line test of super-speed maglev train. The super-speed maglev train is composed of vehicle, propulsion, power, and so on. In order to evaluate and diagnose for sub-system, we made overall measurement system. Just like the other measurement system, it is designed to distributed type. The hardware is consist of SCXI, PXI, Terminal, UPS, and so forth. It is installed on a train, control room, power room and track to collect lots of signals. The software controls hardware system, monitors main data such as inverter current, converter voltage. Using the measurement system, we evaluated a lot of performances for vehicle, track, and so forth. Through the developed system have improved reliability and safety for super-speed maglev train.

• Journal of Fisheries and Marine Sciences Education
• /
• v.27 no.3
• /
• pp.696-705
• /
• 2015

Approximately 4,000 vessels including sea trial ships per day are passing, entering or departing from Korea coastal waterway. Sea trial ships have erratic navigating patterns such as quick turning, crash stop and do not communicate with other vessels in appropriate time, so sea trial ships are often to expose dangerous situation such as collision in heavy traffic area. To identify the sea trial vessel's risk factors, this paper surveyed marine traffic volumes for 7 days in Korea harbour & coastal waterway, and it analyzed marine accident rate and intended to identify the risk degree of passing vessels. After that, this researched how many sea trial ship's traffic and what is the sea trial risk among sea trial items. We also conducted survey questionnaire and identified risk factors of sea trial ship. So this paper aimed to enhance the safety of korea coastal waterway to prevent sea trial ship's marine accident.