• KSCE Journal of Civil and Environmental Engineering Research
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• v.34 no.3
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• pp.1017-1022
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• 2014

Since the opening of Seoul Subway Line #1 in 1974, the number of passengers has been increasing. The possibility for passenger's accidents in railway stations has also increased. In order to decrease these kind of accidents, railway operation systems have been automated. Nevertheless, the possibility of a casualty accident in railway stations remains. This study analyzed the type of casualty accidents, casualty accidents by age, sex, pedestrian facility, and passenger type based on the internal data of Seoul Metro. The causes of casualty accidents are also found out. Finally, the establishment of railway safety education program and railway safety experience center are suggested in order to prevent the urban railway casualty accident in advance at railway stations.

• Proceedings of the KSR Conference
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• 2011.05a
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• pp.1440-1444
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• 2011

Memory-device is one of the auxiliary components of point-switch machine; connecting front-rod and tongue-rail. The right side and left side of memory-device are different from each other. When there would be a derailing accident of rolling stock or motor-car, the memory-device properly bends and protects the internal of point-switch machine. Memory-device is one of the important site maintenance spare parts. Memory-device for each of right and left side should be secured so that they can be installed on correct side during an exchange work. This study suggests the development of memory-device with different left and right side and the performance test of it. The study intends to contribute in the convenience improvement of maintenance by improving the unification of memory-device.

• Proceedings of the KSR Conference
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• 2011.10a
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• pp.2941-2948
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• 2011

Rialway passengers and public, workers typically have high potential on death and injury accidents, because they are to be frequently adjacent to train or train operation. In order to effectively reduce the risks associated with the passengers, the public, and the workers, a systematic risk assessment should be performed to evaluate the hazards that contribute to the accidents. This paper describes the effect of risk assessment web base system and the extension need of the classification of "The regulation of railway accident report and information in Korea", application for national or railway safety operator, sharing railway safety information.

• Transactions of the Korean Society of Mechanical Engineers A
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• v.33 no.2
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• pp.169-178
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• 2009

The presence of low adhesion at the wheel-rail contact point can result in skid of train wheels, and the skid, in turn, results in flats appearing on the wheels. Thus, anti-skid control has a crucial role for safe braking and prevention from flats that could cause a disastrous train accident. This paper presents dynamic modeling of a tilting train and the brake system of the tilting train, and analyzes the anti-skid logic used in the tilting train. The validity of the analysis is demonstrated via simulation study using Simulink for skid and re-adhesion circumstances of the tilting train.

• Proceedings of the KSR Conference
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• 2007.05a
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• pp.543-550
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• 2007

This study is for an effective response as the pre-stage for railway agencies to prepare the rail road kind based emergency response standard operation procedures when the emergency event occurs. Accordingly, I would like to increase the utility in helping the railroad employees to make their decisions. And that is possible through suggesting them to make computerized Emergency situation based activity and Emergency response that is individual based. And of course all of this procedure would be based on the emergency event categorized response scenario.

• Proceedings of the KSR Conference
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• 2010.06a
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• pp.1703-1712
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• 2010

The safety of tilting train running on curved track is, in general, evaluated with a derailment coefficient calculated by the ratio of wheel load and lateral force, Particularly on curve, the wheel load and lateral force on rail may cause trackbed to be deformed, depending on their intensity, and moreover, often result in critical accident such as derailment. This study hence was intended to identify the cause of wheel load and lateral force so as to suggest the allowable wheel load reduction rate, lateral force limit and derailment coefficient, thereby quantitatively evaluating the operational safety of tilting train. This study therefore was aimed to analyze the wheel load and lateral force occurred during tilting train's operation on circular curve in such a way of comparing with traditional trains, by axle and speed, in a bid to eventually evaluate the operational safety of tilting train.

• Proceedings of the KSR Conference
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• 2009.05a
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• pp.1376-1382
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• 2009

Railway system is a word that includes rolling stock, railway infrastructure and signalling System in passenger transfer and rail freight. This system get higher competitiveness in energy efficiency part than other transfer system. But it is comprehensive system has latent loss of lives and property by big accident. First of all, to control this comprehensive system and to confirm safety of it, we need human resource management. This research will suggest how to apply efficiency safety verification and certification system to railway system. human resource management systems is defined as three kinds that is recruitment and management, ensure personnel's competencies and fitness, activity of assigning suitable responsible person for work.

• 유공압시스템학회:학술대회논문집
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• 2010.06a
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• pp.93-97
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• 2010

Wheel skids may occur during train operations due to low adhesion at the wheel-rail contact point abnormally, and the skids, in turn, result in flats appearing on the wheels, which affect safety and ride comfort significantly. Thus, anti-skid control has a crucial role for safe braking and prevention from flats that could cause a disastrous train accident. This paper presents simulation studies on an anti-skid control unit (ASCU) with a brake system of a rolling stock including a pneumatic model for brake power supply and dump valve operation.

• Proceedings of the KIEE Conference
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• 1999.07a
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• pp.446-448
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• 1999

The forced drainage set up to decrease the cathodic protection in each kind of steel conduit laid under the ground is so proscribed to be maintained less than 60V in its output voltage that insulation coordination is easy to be left out of account, on the basis of 60V of working voltage. When railway or subway break down during the service of a subway, 1,500 voltage approximating to line voltage flows through the load terminal of the drainage (rail and underground conduit) though momentary in the worst case. And so, an accident followed by dielectric breakdown, fire and damage by a fire is expected. Therefore, I suggest that insulation coordination should be considered against such a thing on designing, producing and setting up forced drainage.

• Proceedings of the KSR Conference
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• 2006.11b
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• pp.1203-1209
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• 2006

One dimensional collision analysis is often used to simulate a train-to-train coupling or collision accident. But there are various numerical modeling techniques utilized for dynamic models of rolling stocks such as a lumped-spring-mass model or a bar-mass model. In rolling stock industries, a lumped-spring-mass model is mainly applied without consideration of bogie attachments separately. In this case, a dynamic stiffness coefficient is introduced to compensate the overestimated car mass effects due to the linkage stiffness of bogies and seats. In this paper, the effects of dynamic stiffness coefficients and wheel-rail friction coefficients were studied by simulating a bar-mass model with bogie attachments separately.