• 한국철도학회논문집
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• 제12권5호
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• pp.778-787
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• 2009

본 논문은 우리나라에서 철도가 가져온 사회경제적 변화에 대해 분석하였다. 우리나라 철도는 1899년 개통된 이후 금년으로 110주년이 되었는데 철도는 그동안 교통뿐만 아니라 국토의 공간구조, 새로운 도시의 형성 등 사회경제적으로 큰 영향을 미쳤다. 대전은 좋은 예의 하나이다. 본 논문에서는 철도가 가져온 변화를 구체적인 사례를 통해 통행시간의 변화, 도시발전과 인구변화, 산업의 변화, 문화와 관광의 변화 등을 분석하였다. 향후 이러한 연구는 다른나라와의 비교연구를 통해 철도가 가진 보편적인 기능과 한국철도의 독특성을 파악하는데 도움을 줄 것이다.

• 전기학회논문지
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• 제64권9호
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• pp.1398-1405
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• 2015

Domestic railway communication in Korea has been introduced for mutual communications among control center, operation staffs, and maintenance staffs. It has been mainly used as railway disaster and safety functions from VHF and UHF from 1980’s and TRS-Astro and TRS-Tetra from the 2000’s. Recently for urban railways communications, 18GHz and 2.4GHz ranges have been utilized for image transmissions and control command communications, respectively. This paper analyzes technical development of LTE-R, LTE communication for Railways, that has been designed as a single integrated railway wireless network in order to merge the current various communication systems. In this paper, we present the details of the examination of the LTE-R test-bed using 2.6GHz test frequency in Daebul test line through CW test and optimization test.

• 전기학회논문지
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• 제62권3호
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• pp.414-416
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• 2013

As the usage of the electric power train increases, the importance of the control network between the electric control devices grows. IEC proposed a revision of IEC-61375, a standard of the networking among electric devices within a train, to adopt Ethernet as a backbone of train network. This paper performed the reliability analysis of three configurations of Ethernet-based networking within a electric power train that are recommended in IEC-61375 standard. The analysis results show that MTTF(mean time to failure) of the redundant configuration is 20,086 hours, which is a about 3 times longer than the linear configuration.

• Journal of Electrical Engineering and Technology
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• 제9권3호
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• pp.882-887
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• 2014

In this paper, the water cooling method among the forced coolant cooling methods is considered to be applied to the 110kW-class IPMSM for railway vehicles. First, basic thermal property analysis of the IPMSM is conducted using the three-dimensional thermal equivalent network method. Then, based on the results of the basic thermal property analysis, some design requirements for the water cooling jacket are deduced and a basic design of the water cooling jacket is carried out. Finally, thermal equivalent circuit of the water cooling jacket is attached to the IPMSM's 3D thermal equivalent network and then, the basic thermal and effectiveness analysis are conducted for the case of applying the water cooling jacket to the IPMSM. In the future, the thermal variation trends inside the IPMSM by the application of the water cooling jacket is expected to be quickly and easily predicted even at the design step of the railway traction motor.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2005년도 춘계학술대회 논문집 전기기기 및 에너지변환시스템부문
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• pp.241-243
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• 2005

The study for ubiquitous computing infra is proceeding actively, it make possible to use service and access network anywhere, anytime because of wire/wireless communication technology and progress of hardware. Domestically, study for the network mobility support technology which is the key technology for future ubiquitous computing realization have progressed, but that is insufficient. Especially, there is no study for independent mobility support study about railway wireless network. So, this study propose network mobility management technology for mobile network infra in railway and proper network model in train.

• 한국철도학회논문집
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• 제16권6호
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• pp.551-557
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• 2013

본 연구는 철도전용 통합무선망 개발을 위한 LTE 통신 방식의 적용타당성 연구를 목적으로 하며, 호남선 일로역에서 대불역 사이 약 12km 구간에 걸쳐 철도전용 통합무선망을 구축하여 실증 분석하였다. 한국의 철도 안전 무선통신은 노선 별로 방식이 상이하여 각 철도 종사자간 협업이 어려워 다양한 문제점이 발생하고 있으며 무선통신 시스템간 통화 단절 및 상용 무선망과의 주파수 간섭 및 혼신에 따른 사고 발생 위험이 상존하고 있다. 본 연구는 이러한 문제를 해결하기 위한 방법으로 대두되고 있는 철도전용 통합무선망에 4세대 통신방식인 LTE를 적용하는 것이 타당한지를 살펴보았다. 열차 선로라는 기지국 설치 위치의 제약이 있었음에도 모든 시험 항목에서 기존 유럽의 GSM-R의 성능 기준을 상회하는 결과를 보였다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2011년도 제42회 하계학술대회
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• pp.2206-2207
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• 2011

컴퓨터 통신기술 발달에 따라 철도의 열차제어에 대한 기술도 기존의 궤도회로기반에서 무선통신기반으로 변화되고 있다. 국내에서도 도시철도용 무선통신기반 열차제어시스템의 개발이 진행됨에 따른 개발품의 성능평가에 대한 관심이 높아지고 있다. 따라서 본 논문에서는 새롭게 개발되는 무선통신기반 열차제어시스템의 성능평가를 위해 성능시험 항목의 선정과 현장에서의 시험을 위한 시험선로 지상 및 차상인프라 구축에 대한 기본적인 검토를 기반으로 시험 및 성능평가 시행의 종합기본계획을 수립하는 검토를 수행하였다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2001년도 하계학술대회 논문집 B
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• pp.1236-1238
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• 2001

The electrified railway has various power supply schemes. Although the identical trains are operated in same condition and the impedance of track are equal, the genealogy impedance of track is changed according to composition method of feeding scheme. So, the collection voltage of train and supplying power from railway substation are greatly unlike. For simulation of collection voltage and power supply according to feeding scheme, using 6-port network analysis proposed previously simulate collection voltage and supply power according to feeding scheme(Parallel Post feeding system, normal feeding system and tie feeding system) and compare and investigate each characteristics.

• Journal of information and communication convergence engineering
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• 제18권1호
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• pp.28-32
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• 2020

Railway transportation is the main land-based transportation in most countries. Accordingly, railway-transportation safety has always been a key issue for many researchers. Railway pedestrian accidents are the main reasons of railway-transportation casualties. In this study, we conduct experiments to determine which of the latest convolutional neural network models and algorithms are appropriate to build pedestrian railroad accident prevention systems. When a drone cruises over a pre-specified path and altitude, the real-time status around the rail is recorded, following which the image information is transmitted back to the server in time. Subsequently, the images are analyzed to determine whether pedestrians are present around the railroads, and a speed-deceleration order is immediately sent to the train driver, resulting in a reduction of the instances of pedestrian railroad accidents. This is the first part of an envisioned drone-based intelligent security system. This system can effectively address the problem of insufficient manual police force.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2006년도 추계학술대회 논문집
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• pp.530-537
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• 2006

Recently, the railroad route plan is trying to minimize the damage of the local resident which is caused by railroad construction. For this reason, reducing the banking height of soil roadbed, lowering the bridge girder height of a solid intersection and a part of cross river, the through bridge type which can achieve a required span length must apply. The representative through bridges of railroad are arch bridges, truss bridges and plate girder bridges, the through plate girder bridge of variable section can apply that the span length of these bridges is about $30{\sim}50m$, namely, middle span length bridge types, and that can satisfy structural capacity and beauty of railroad at the same time. This paper introduces plan and design process of the Su-eo cheon bridge applied by a through plate girder bridge type of the Jinju-Gwangyang double track 6th construction ordered at Korea Rail network Authority in 2005.