• 대한전기학회:학술대회논문집
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• 대한전기학회 2001년도 하계학술대회 논문집 B
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• pp.1266-1268
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• 2001

ProfiBus provides real-time data communication among field devices in the EMU (Electrical Multiple Unit) and TCMS (Train Control Monitoring System). This paper presents an adapt to Train Communication Network for EMU using ProfiBus DP(Decentralized Periphery) mathod, which is the layer 2 DDLM(Direct Data Link Mapper) protocol of ProfiBus.

• 제어로봇시스템학회:학술대회논문집
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• 제어로봇시스템학회 2003년도 ICCAS
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• pp.2147-2150
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• 2003

Recently, many technologies of the P.L.C (Power Line Carrier) are introduced for an efficient communication. P.L.C communication sends information in the carrier signals by conduction over the power wire. An arc detector is proposed in this paper for the effective transmission. The Power Line Carrier has an advantage in low cost because it uses existent power line. It can be easily applied anywhere that a power line socket is available. But the P.L.C. is very noisy, because many electronic devices in generate electronic noise in modulated signals. This problem should be considered carefully in the design of the arc detector system using P.L.C in railway. The proposed system can be applied for monitoring the arc detector system and the arc locator system in railway. Hence the system will be able to exchange the arc information to be T.C.M.S. (Train Control Management System), bogies and even between a station and trains in railway and use to suspicion fire in train.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1999년도 하계학술대회 논문집 B
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• pp.671-673
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• 1999

In order to cope with the occurrence of abnormal operation, rotatory condition monitoring system for guide roller of finishing train in wire rolling has been developed. In this study, proximity sensor and its holding devices that could overcome severe in-situ measurement conditions was designed and MMI software using C++ was programmed. Performance of the developed system turned out to be good enough as results of in-line test for POSCO #3 wire rolling mill. It is expected to contribute to prevent the cobble and the grade-down of products caused by the abnornormal operation of guide rollers.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2005년도 학술대회 논문집 정보 및 제어부문
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• pp.484-486
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• 2005

Passenger safety is a primary concern of railway system but, it has been urgent issue that dozens of people are killed every year when they falloff from train platforms. Recently, advancements in IT have enabled applying vision sensors to railway environments, such as CCTV and stereo camera sensors. In this paper, we propose a stereoscopic video coding scheme for subway accident monitoring system. The proposed scheme is designed for providing flexible video among various displays, such as control center, station employees and train driver. We uses MPEG-2 standard for coding the left-view sequence and IBMDC for predicting the P- and B-types of frames of the right-view sequence. IBMDC predicts matching block by interpolating both motion and disparity predicted macroblocks. To provide efficient stereoscopic video service. we define both temporally and spatially scalable layers for each eye's-view by using the concept of Spatio-Temporal scalability. According to the experimental results. we expect the proposed functionalities will play a key role in establishing highly flexible stereoscopic video codec for ubiquitous display environment where devices and network connections are heterogeneous.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2008년도 춘계학술대회 논문집
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• pp.1871-1879
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• 2008

A few years ago, The trains had little control equipment so the trains had little data transmission between control equipment. Recently, there is a lot of control equipment in a train as traction control, air conditioners and even internet access. for this reason, vehicle network must allow for the big amount of transmission data and must ensure the high reliability. In this paper we present monitering system for verify high reliability of data transmission of MVB of TCN which is an international standard of IEC 61375.

• 한국시뮬레이션학회논문지
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• 제23권1호
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• pp.11-20
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• 2014

본 논문은 차세대 열차제어 시스템인 KRTCS (Korea Radio Train Control System)의 네트워크의 안정성에 대해여 연구한다. KRTCS는 철로 상에 운행중인 모든 열차들의 위치, 이동속도, 정위치 정차, 차량 문 개폐, 차량 내부 상황 등을 전체적으로 관리 감독하는 시스템으로 시스템의 동작 오류는 열차 운행에 지장을 초래할 뿐만 아니라 경우에 따라서 큰 사고로 이어질 수 있기 때문에 안정성에 대한 다각적인 검증을 반드시 필요로 한다. 이를 위해 본 논문이서는 실제 열차 운행이 이루어지는 환경과 운행 방식, 그리고 네트워크 장비에서 발생할 수 있는 동작 오류 패턴을 조사하고 이를 토대로 QualNet [1]을 활용해 다양한 환경에서 시뮬레이션을 실행한다.

• 한국산학기술학회논문지
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• 제10권11호
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• pp.3115-3120
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• 2009

전기선로전환기는 열차가 진행하고자 하는 진로로 운행할 수 있도록 분기기를 전환시키는 설비로서 도시철도 및 간선철도를 비롯한 대부분의 철도에서 많이 설치되어 사용되고 있다. 이러한 전기선로전환기의 유지보수 작업대부분은 유지보수자들이 포터블 계측기를 이용하여 수작업으로 현장에서 모터 전원, 제어 전원, 표시 전원에 대한 측정을 하는 것이다. 특히 NS형 또는 NS-AM형 전기선로전환기의 경우에는 유지보수 주기가 너무 잦기 때문에 이러한 측정에 많은 인력이 요구되고 있을 뿐만 아니라 작업 도중 부주의에 의한 사상사고도 발생하고 있다. 본 논문에서는 이러한 유지보수 작업의 향상을 위해 현장에 설치된 전기선로전환기의 상태를 모니터링하는 시스템을 제안하고 있으며, 이러한 모니터링 시스템은 전기선로전환기에 대한 각종 측정값을 실시간으로 확인하여 유지보수 업무의 향상을 이룰 수 있을 것으로 기대된다.

• Smart Structures and Systems
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• 제21권5호
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• pp.695-703
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• 2018

Based on monitoring data collected from the Nanjing Dashengguan Bridge over the last five years, this paper systematically investigates the effects of temperature field and train loadings on the structural responses of this long-span high-speed railway bridge, and establishes the early warning thresholds for various structural responses. Then, some lessons drawn from the structural health monitoring system of this bridge are summarized. The main context includes: (1) Polynomial regression models are established for monitoring temperature effects on modal frequencies of the main girder and hangers, longitudinal displacements of the bearings, and static strains of the truss members; (2) The correlation between structural vibration accelerations and train speeds is investigated, focusing on the resonance characteristics of the bridge at the specific train speeds; (3) With regard to various static and dynamic responses of the bridge, early warning thresholds are established by using mean control chart analysis and probabilistic analysis; (4) Two lessons are drawn from the experiences in the bridge operation, which involves the lacks of the health monitoring for telescopic devices on the beam-end and bolt fractures in key members of the main truss.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2003년도 추계학술대회 논문집(III)
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• pp.628-633
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• 2003

Recently, the electronic circuit with microprocessor based control system instead of conventional analog circuit is widely used for rolling stock, and also these circuits are widely adopted for train control and monitoring in modem rapid transit system. Noise, distortion and attenuation are always present in electronic equipments and strictly limit performance. The purpose of this paper is to propose noise reduction technology for electronic equipments in rolling stock.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2008년도 추계학술대회 논문집
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• pp.536-543
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• 2008

When the electric motor car was first introduced, an engineer, responsible for the work related to operation and a conductor for the announcement and management of entrances and the other services like as monitoring the passengers in the platforms used to take together the train for passengers' safe. As new technologies developed and the urban transit system had the automatic driving facilities, automatic door switch and broadcasting systems, to solve the financial problems, most subway systems introduced the one-man operation system. To curtail the operating expense through automatic control and operation for the economical efficiency, the crewless driving system was introduced abroad around 1970 on the light weight train and Japan started the crewless driving system in 2005, Germany started it in June 2008. We examine system requirements of the system and methods to construct safe systems that would be introduced, suitable for one-man operation system or crewless driving system through the surveys and analysis of driving state and the systems.