• Defense and Technology
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• no.3 s.241
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• pp.86-95
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• 1999

현대전은 군수면에서의 기술적 우세에 의해 전쟁의 승패가 결정되며, 최종목표달성은 지상전에 의해서 이루어진다는 걸프전의 교훈을 바탕으로, 지상무기 체계의 핵심인 전차/장갑차에 의한 전력증강 방법이 크게 대두되고 있다. 이러한 전쟁증강 방법으로 러시아 도입 T-80U/BMP-3와 북한의 전차/장갑차를 철저하게 분석하고, 우리군의 활용방안에 대해서 검토하여 앞으로의 나아갈 바를 판단할 수 있는 계기를 마련하면서 향후 이를 적극적으로 대처하는 연구.개발 활동과 접근자세가 내부적으로 더욱 필요하다고 판단된다

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• v.9 no.1
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• pp.947-950
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• 2005

For revolving and elevating a turret of a tank, we substitute an existing oil pressure system with an electric system using a motor and applied the vector control method to this system. A switching method of an inverter for providing desired sinusoidal current to each phase of a motor, we adopted min-max pulse width modulation method which takes less computation time, rather than space vector pulse width modulation method. We designed a digital filter and applied it to the control system. Developed current controller is verified it's performance through a current control test, speed control test, frequency response and tracking a profile of speed test.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.33 no.1
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• pp.273-286
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• 2013

Recently, due to problems with subway and bus operations, a need has emerged for a solution such as the introduction of an Advanced Transit System. In several municipalities, systems have been introduced using light rail as AGT urban aesthetics construction. There is high inhibition and civil cases are delayed by more environmentally friendly and accessible remedies. For the purpose of this study, Changwon city would be transformed to have an environmentally friendly transportation system such as a tram with an overview. Features, advantages, and disadvantages are analyzed, and systems are established the existing public transport routes by transfer system. Changwon city's tram plan is first step in open in year 2018, and second step with the opening goal of the year 2021, and the total line length of 33.9 km, the station will be built in the 38 locations. and also in 2011 a feasibility study, evaluated a low economic as B/C to 0.88, but it evaluated the high value of the policy analysis as AHP to 0.502. However, introduction of a tram project that should precede the as following condition. The first step in Changwon city's tram plan would be as follows : The introduction of the tram system would demand traffic management along with a restructuring of the bus system, and the tram system would be selected for domestic realities. Secondly, the introduction of trams would comprehend the advanced traffic composition in accordance with the consensus of the citizenship, and a legal system should be established for the introduction of the trams.

• Defense and Technology
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• no.9 s.151
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• pp.66-73
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• 1991

선진 항공기 개발국들은 인간공학적인 조종사-항공기 인터페이스의 중요성을 제2차 대전시에 깊이 인식하였으며, 현재는 개발되고 있는 항공기별로 40~50명의 연구원들이 인간공학적 연구를 하고 있다. 또한 항공기 무기체계 개발과 마찬가지로 전차, 군함, 잠수함, 유도 미사일 등의 무기체계에도 반드시 사용자의 인간 공학적인 요소들이 적용될때, 성능이 최대로 보장될 것이다

• Journal of the Korean Society for Precision Engineering
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• v.18 no.2
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• pp.206-213
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• 2001

An overlapping decentralized robust EA(eigenstructure assignment) controller is designed for an active suspension system of a vehicle based on a full car model with 7-degree of freedom. Using overlapping decomposition, the full car model is decentralized by two half car models. For each half car model, an effective and disturbance suppressible controller can be obtained by assigning appropriately a left eigenstructure of the system. The performance of the proposed overlapping decentralized robust EA controller is compared with that of a conventional centralized EA controller through computer simulations.

• 제어로봇시스템학회:학술대회논문집
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• 2000.10a
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• pp.217-217
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• 2000

A decentralized robust EA(eigensoucture assignment) controller is designed for an active suspension system of a vehicle based on a full car model with 7-degree of freedom. Using overlapping decomposition, the full car model is decentralized by two half car models. For each half car model, a robust eigenstructure assignment controller can be obtained by using optimization approach. The performance of the decentralized robust EA controller is compared with that of a conventional centralized EA controller through computer simulations.

• Fashion & Textile Research Journal
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• v.14 no.2
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• pp.261-268
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• 2012

The purpose of this study is to investigate problems of design, fitness, suitability for movement, and wearing comfort of jumper for Korean military tank drivers through analysis of actual wearing condition by questionnaire and field evaluation and to provide basic data for developing its improved design. The survey was done for 477 military tank drivers and evaluation was performed using thermal manikin to measure insulation. The overall satisfaction for design of jumper for military tank driver was over 3.5(likert scale). The overall satisfaction for fitness of jumper for military tank driver was also over 3.5. The satisfactions for material was between 2.39 and 3.13 and the satisfaction for pilling property was the lowest, followed by static property and shape stability after laundering. The satisfactions for movement suitability were standing(3.81), sitting(3,38), raising hand(forward: 2.90, sideward: 3.01), respectively. In insulation evaluation of jumper for military tank drivers and outwears(jacket, jumper), the insulation of jumper for military tank drivers was lower than outwear(jumper) and same with outwear(jacket). The insulation in dynamic and still condition(without wind) of jumper for military tank driver was 0.37clo and 0.31clo, respectively. Its decreation rate in dynamic condition comparing to still condition was 59% which was lower than jacket(0.73clo) and jumper(1.15clo).

• Proceedings of the KSME Conference
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• 2002.08a
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• pp.619-622
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• 2002

It has been recognized that the flow in the blade passage of an axial turbomachinery rotor is very complex and is influenced by various flow phenomena, of which the tip leakage flow passing through the gap between rotor blade tip and casing plays a significant role. The losses produced due to the existence of the clearance have been known to be a large contributor of the rotor overall losses. Despite several experimental studies on non-rotating blade in the cascade configuration, and on actual rotating blades, the detailed nature of the complex flow phenomena associated with tip leakage, however, remains largely unresolved. Thus, a single-stage compressor test rig was built and measurements were taken at upstream and downstream of the rotor of this compressor at the aerodynamics laboratory of University of New South Wales. A five-hole probe and a hot-wire probe were used to measure mean and fluctuating flow parameters. The results show that tip leakage losses rise rapidly beyond tip gap of 0.01 Furthermore, the present project also identifies the regions in the wake behind the rotor of the axial compressor where such losses are concentrated. These results should be useful in the better design of rotors for improved performance of axial compressor.

• Proceedings of the KIEE Conference
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• 2002.11b
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• pp.290-292
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• 2002

전기철도 급전계통은 차량 또한 이동 부하이고, 비정상적인 전기적 특성이 나타날 수 있으므로, 전기적으로 정확한 해석을 할 필요가 있다. 본 연구는 PSCAD/EMTDC 과도해석 프로그램을 이용하여 직류 전기 철도 시스템을 모델링 함으로써 전기철도 급전계통의 정확한 특성을 연구하는 것이다. 한전 계통으로부터 전력을 급전 받아 전기철도차량 부하에 공급되는 급전계통을 실제와 가깝게 모델링 함으로써 정상상태 해석과 사고 시 과도특성 분석 및 계통에의 영향 해석을 목적으로 한다. 프로그램 특성상 각각의 소자를 모델링 한 후 4단자망 이론에 근거, 각 소자를 결합하여 전체 계통을 구성한다. 각각의 소자는 전차선로, 정류기 및 제어기를 포함한 차량부 (전동기, 제어소자), 정류 변전소 등으로 구성된다. 이 논문에서는 급전계통의 정상상태 및 고장전류를 분석함으로서 제안된 모델을 검증한다.

• Proceedings of the KSR Conference
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• 2009.05a
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• pp.900-904
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• 2009

The measurement of contact wire uplift in electric railway is one of the most test method to accept the maximum permitted speed of new vehicles or pantographs. The contact wire uplift can be measured for shot periods when pantograph is running in monitoring station. This paper describes the development of two different methods for contact uplift measurement using vision-based system and wireless online monitoring system. Our vision-based system employs a high-speed CMOS (Complementary Metal Oxide Semiconductor) camera with gigabit ethernet LAN. The development of a real-time remote monitoring system that acquires data from any kind of sensor to be transmitted by wireless communication from overhead line and structure at 25 kV to a computer in catenary system. The proposed two kind of different measurement systems to evaluation for dynamic uplift of overhead contact wire shows promising on-field applications for high speed train such as Korea Tilting Train (TTX) and Korea Train eXpress (KTX).