• Tunnel and Underground Space
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• v.2 no.1
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• pp.28-49
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• 1992

• The Academic Congress of Korean Shoulder and Elbow Society
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• 1999.03a
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• pp.97-98
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• 1999

• Transportation Technology and Policy
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• v.10 no.3
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• pp.49-55
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• 2013

• Proceedings of the Optical Society of Korea Conference
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• 2006.02a
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• pp.221-222
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• 2006

• Railway Journal
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• v.19 no.1
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• pp.63-68
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• 2016

• Proceedings of the KSR Conference
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• 2006.11b
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• pp.885-889
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• 2006

Metro Subway System is widely known as the leader of public transportation in a metropolitan area. The signal interlocking is one of the most important organs that plays a major role in the system. By improving the quality of signal lights on the traffic system and keeping its maintenance on a high level will not only repair the current state, but it will also let the LED type signal semi-permanent. The device, which underwent a process of fine manufacture establishment and a close examination, obtained a patented article (2004, as a new device). Utilizing the equipment with cautious preservation on the system will enhance the current state of the signal device. Especially, the test for improvement and development based upon the technique that decreases the frequency of defect produced will further precipitate its efficiency. With authorization of imposing the LED lights on production, installment, and investigation of the system, the newly made equipment will bring improvement to the signal technology and to the industry at largest extent.

• Proceedings of the KSR Conference
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• 2007.11a
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• pp.35-50
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• 2007

A contact patch between the wheel and the rail supports the train body and a traction power comes from it when rolling stocks run on the railroad. Friction force between the wheel and rail makes the train move on the rail. Whenever the train runs on the rail, the wheels and rails wear down by frictions inevitably. So it must be shaped by the lathe or changed for the safety train operation and the comfortable ride. Until now, many measures were carried out in order to prevent a wear and tear of the wheels. For example loop line railway in Kun Ja depot and Ji Chuk depot. This document reports the wheel changing data taken by maintenances department for the period before and after 1996 in the 1.2.3.4 lines in Seoul metro.

• Proceedings of the KSR Conference
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• 2011.10a
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• pp.1960-1965
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• 2011

Train operations run trains to well-scheduled time table and the ideal case would be to have the trains running exactly as scheduled. The train delay resulted from the overcrowding takes place frequently in Seoul metro line 2, and doesn't keep the predefined headway. It requires to analyze the train delay caused from the overcrowding. In this paper we modeled, simulated, and analyzed the delay to disclose the effects in the line 2 operation. The modeling consists of trains entering into the line, running on the line and exiting from the line. The simulation carries out with statistical perturbation and analyzes the disturbance.

• Journal of the Korean Society for Railway
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• v.10 no.4
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• pp.381-387
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• 2007

In this paper, crashworthiness of the EMU carbody of Incheon Metro is numerically evaluated against two types of overhead line structures (headspan and portal-type). The material of the EMU carbody is stainless steel (SUS301L), and that of the overhead line structures is the structural steel (SS400). The EMU carbody is analyzed under collision conditions, such as upright side-on impact, side-on roof impact and angled roof impact scenarios, to be collided against the headspan type or the portal type at the speed of 64.4km/h, respectively. It is concluded from the numerical results that the overhead line structures will not do so much harm to the EMU carbody of Incheon Metro for various collisions caused by derailment. Furthermore, the overhead line structure of the portal type is superior to that of the headspan type in the crashworthy point of view.

• Proceedings of the KSR Conference
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• 2010.06a
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• pp.1371-1375
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• 2010

Recently, the Seoul Metro has replaced the old series of Line No.2 and 3 to the new ones. In spite of the replacement, the new ones are more likely to be slippery compared to the old ones. Because the subway system has such short intervals, delayed subways influence the whole line systems, especially during the rush hours. And the slip causes the delay. Therefore we are willing to find out the reason why the new ones are more defective and we will try to mince it from the view of mechanical aspects and handling aspects of driving.