• Proceedings of the KIPE Conference
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• 2004.07b
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• pp.866-869
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• 2004

무선을 이용한 위치 추적방법은 최근에 많은 관심을 받고 있다. 이 방법들은 적용지역환경 및 대상에 따라 적절한 방법을 선정하여 사용하는 것이 중요할 뿐만 아니라 신뢰성을 갖는 것 또한 매우 중요하다. 본 논문에서는 일정한 노선으로 움직이는 열차라는 이동체를 대상으로 하여 적용 가능한 알고리즘에 대하여 검토하였으며, 이는 1차원에서 물체의 위치를 추적하는 방법으로써, 열차와 같은 일정한 노선 위를 이동하는 물체의 위상을 추적하여 이동체의 위치를 결정하는 알고리즘을 구현을 위한 방법과 조건을 제시하였으며 철도시스템으로 확장 적용을 위한 알고리즘을 제시하였다.

• The Transactions of the Korean Institute of Electrical Engineers B
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• v.54 no.1
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• pp.9-16
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• 2005

Accurate and reliable tracking of train is essential for the train control system. The fixed block system which utilizes track circuit has been used widely for the detection of train position. As an alternative, the moving block system has the advantage over the fixed block system since it enables shorter headway and easier maintenance. This paper presents a new technique for the train tracking system which uses radio signal for the train position detection. The proposed algorithm uses the phase difference of arrival of radio signal for the detection of train position. Experimental verification of the algorithm is presented in the paper.

• Proceedings of the KIEE Conference
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• 2011.07a
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• pp.85-86
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• 2011

철도운영효율 향상을 위하여 첨단 기술을 기반으로 하는 스마트 철도 기술에 대한 개발 및 실용화 사업이 전 세계적으로 진행중에 있다. 철도의 수송력 증대와 운영비용 감소 및 시스템 변경 용이성등의 장점을 극대화하기 위하여 기존의 궤도회로 중심의 열차제어 시스템에서 통신기술을 기반으로 하는 열차제어시스템으로의 전환을 위한 많은 연구가 이루어지고 있다. 본 논문에서는 CBTC 시스템에서 GPS시스템의 적용 타당성 여부를 검증하였고 CBTC 시스템에서의 위치 정보 수신을 위한 GPS 수신데이터의 정합 알고리듬에 관한 저전력 분할 연산 알고리듬을 설계하여, 본 논문에서 제안한 코드는 기존의 수신데이터의 정합알고리듬 대비 2% 면적이 감소하는 것을 확인할 수 있었으며, 또한 전력소모가 7% 감소되는 것을 확인할 수 있었다.

• Transactions of the KSME C: Technology and Education
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• v.1 no.2
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• pp.199-204
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• 2013

In this paper, a new system requirement management tool and its application on the Urban Transit Maglev Project were introduced. In most R&D projects on complexity system such as transportation system, Systems Engineering(SE) activities are included on each project, and SE teams are using commercial computer-based tools to perform the SE activities. Even though SE tools help to manage huge data and documents on engineering efficiently, but well-designed functions of SE tools which support SE activities are not sufficiently used on the whole process of system engineering. In order to computer-based SE tools are to be effectively used on project management, most engineers who takes engineering and coordination roles, at least sub-project managers should be familiar to the tool and could be easily use it, but usability of commercial SE tools are very difficult for normal engineers with no experience on SE activities and SE tools. To overcome this difficulty, we developed a new system requirement management tool considering each user's scenario on using engineering tools. The developed tool could not cover whole SE processes, but designed to perform requirement engineering such as system requirements(SRs) management, specification management, traceability management, SRs' verification activity management and so on. All the entities on SR database are inter-connected by pre-recognized traceabilities, so even non-specialists on SE can easily browse the database and find entities concern, and linked information such as interacted entities, legal or engineering constraints, coordination documents, status of development and verification and so on. Also functions for SR verification tools, TPM(Technical Performance Measure) tools, DB searching tools with traceability, and report generation tools are included on the system.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.16 no.9
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• pp.6274-6281
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• 2015

Radio-based train control system has driving headway shortening effect by real-time train interval control using two-way radio communication between onboard and wayside systems, and reduces facility investment because it does not require any track-circuit. Automatic train protection(ATP), the most significant part of the radio-based train control system, makes sure a safe distance between preceding and following trains, based on real-time train location tracing. In this paper, we propose the overall ATP train interval control algorithm to control the safe interval between trains, and preprocessing-based speed profile calculation algorithm to improve the processing speed of the ATP. The proposed speed profile calculation algorithm calculates the permanent speed limit for track and train in advance and uses as the most restrictive speed profile. If the temporary speed limit is generated for a particular track section, it reflects the temporary speed limit to pre-calculated speed profile and improves calculation performance by updating the speed profile for the corresponding track section. To evaluate the performance of the proposed speed profile calculation algorithm, we analyze the proposed algorithm with O-notation and we can find that it is possible to improve the time complexity than the existing one. To verify the proposed ATP train interval control algorithm, we build the train interval control simulator. The experimental results show the safe train interval control is carried out in a variety of operating conditions.

• Journal of the Korean Geotechnical Society
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• v.29 no.10
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• pp.57-66
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• 2013

Societal interest on a faster transportation demands an increase of the train speed exceeding current operation speed of 350 km/h. To trace the pattern of variations in displacements and subsoil stresses in the concrete slab track system, finite element simulations were conducted. For a simple track-vehicle modeling, a mass-point system representing the moving train load was developed. Dynamic responses with various train speeds from 100 to 700 km/h were investigated. As train speeds increase the displacement at rail and subsoil increases nonlinearly, whereas significant dynamic amplification at the critical velocity has not been found. At low train speed, the velocity of elastic wave carrying elastic energy is faster than the train speed. At high train speed exceeding 400 km/h, however, the train speed is approximately identical to the elastic wave velocity. Nonlinearity in the stress history in subsoil is amplified with increasing train speeds, which may cause significant plastic strains in path-dependent subsoil materials.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.17 no.7
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• pp.573-584
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• 2016

The train control system is a facility to ensure model-based design and safe train operation, and its safety is the most important factor for system introduction, complexity of the design information and traceability etc. Therefore, the model-based design and safety activities regarding the way-side equipment of a train control system is also highlighted. To solve this problem, In this paper, model-based design was carried out first to develop an effective train control system, which is represented by SysML(System Modeling Language). The test scenarios that can take advantage of the design model were created to improve the train safety control system. Case studies of a model-based design of a train-centric train control system were applied to the test scenarios; the results demonstrated its usability. The improved activity over the test highlighted the safety improvement approach, and it is expected to reduce the cost and time in the conceptual design of a future development model-based train control system.