• Journal of the Korean Society for Railway
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• v.9 no.1 s.32
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• pp.29-35
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• 2006

Trains in LRT(Light Railway Transit) system usually have shorter car length than metro's because of their smaller passensers demand. Therefore it is very likely that the load condition of LRT system in abnormal operation, in case of which trains are in close proximity by system broke or train rescue works, could be worse rather than in normal operation, in spite of rare probability of abnormal operation. In this study, the target reliability indexes of several abnormal operations are estimated in accordance with the occurrence probabilities of each abnormal operation case and the reliability index of normal operation presented by the specification. From the indexes, load factors for the abnormal operation cases are estimated and the safety evaluation is performed for Yong-in LRT project.

• Proceedings of the KSR Conference
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• 2005.11a
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• pp.488-493
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• 2005

Railload line design of the railroad construction project should be planed considering the variety of quantitative and qualitative factors, and needs to be selected the optimum altinative weighing from VE/LCC analysis of the planned design. The purpose of this research is for showing selecting plan of the optimum railload line and railway bridge applying VE/LCC analysis in selecting the optimum altinative of railroad construction based on quantitative and qualitative factors, such as initial construction cost, maintenance cost, owner and user's requirements. In this research showed the application plan by each stage using data analysis, function analysis, and alternative evaluation of VE/LCC analysis with AHP and LCC analysis program for the selection. This research is proved the rationality and application of the course of selecting the optimum alternative through case application

• Proceedings of the KSR Conference
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• 2000.05a
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• pp.344-351
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• 2000

Recently, the microprocessor with network function based-controlled systems instead of conventional microprocessors is widely used to industrial applications, and also those technologies are widely adopted for train control and monitoring in modern rapid transit systems such as railway vehicles. The purpose of this paper is to propose a high quality data transmission line of railway vehicle system controlled by a microprocessor, which was designed and realized through SMG 7＆8 and ISA project. Noise, distortion and attenuation are always present in data transmission system and strictly limit performance. This paper describes a method to calculate the propagation constant, attenuation constant, phase velocity and length of stub.

• Proceedings of the KSR Conference
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• 2006.11b
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• pp.350-353
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• 2006

Generally, 4D CAD can be used for visualizing construction schedule information in railway construction project. It is important that 3D CAD object should be represented by real construction situation according to construction site condition. However, it is difficult to visualize real construction situation in 4D CAD viewer because 3D objects should be separated by limited duration of each activity. This study suggests a morphing technology for visualizing 4D object by each activity schedule according to real construction progress.

• Proceedings of the KSR Conference
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• 2008.11b
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• pp.1106-1112
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• 2008

Recently many new subway lines and light rail lines are demanded to build as CBTC system for advanced transportation needs. Already several lines are being installed and some other are planned this days. In early 2008, the first korean CBTC project, Bundang Line Intelligent Train Control System was finished successfully then it showed that many advantage of its functionalities to demonstrate. Nowaday, the technology of CBTC in Korea is not standing alone by itself yet, even though a lot of localization was done last decade include ATS (Automatic Train Supervision) and Radio Communication and manufactures and installations, because the core equipment of CBTC is rely on oversea technologies of major railway signal companies. KRRI has been preparing to develop the core equipment of CBTC (wayside ATP and onboard ATO/ATP) with other 14 local railway signal companies. Now they have consisted two consortiums to develop the core equipment by themselves. In this paper, I will mention about how we should focus on the output for viewpoint of interpretabilities between the two groups and review the case study of front developers efforts considering to standardizations we should be following.

• ETRI Journal
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• v.40 no.1
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• pp.39-50
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• 2018

More people prefer using rail traffic for travel or for commuting owing to its convenience and flexibility. The railway scenario has become an important communication scenario in the fifth generation era. The communication system should be designed to support high-data-rate demands with seamless connectivity at a high mobility. In this paper, the channel characteristics are studied and modeled for the railway tunnel scenario with straight and curved route shapes. On the basis of measurements using the "Mobile Hotspot Network" system, a three-dimensional ray tracer (RT) is calibrated and validated for the target scenarios. More channel characteristics are explored via RT simulations at 25.25 GHz with a 500-MHz bandwidth. The key channel parameters are extracted, provided, and incorporated into a 3rd-Generation-Partnership-Project-like stochastic channel generator. The necessary channel information can be practically realized, which can support the link-level and system-level design of the communication system in similar scenarios.

• Journal of the Korean Society for Railway
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• v.20 no.1
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• pp.128-141
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• 2017

This paper analyzes the under-researched field of the characteristics of th Chosun private railway, such as laws, systems, human resources, and subsidies associated with this railway, in an effort to increase our understanding of these characteristics. It was found that the private railway shared strong identity resemblance with a national project, as it served to assist the roles of the main national railway. General patterns of change of the company indicate that the private railway received increased subsidies consequent to the amendment of a related law and that it was strongly influenced by Japan's railway policies. The private railway system during the Chosun period more subsidies than those administered by Japan, and they tended to depend on fund raising for external capital. A tendency of many board members to be from the Chosun bureau was also noted. Profits in the private railway system were relatively low compared to those of the national railway such that the deficits were supplemented by the subsidies redeived. Based on corroborating examples, the private railway system can be said to have been an organization that had strong connections with national projects. It was especially related to regional industries according to an examination of the distribution of lines, which shows that most assisted the main railway or coincided with regions undergoing industrial development. Typically, northern areas were for resource development while southern areas were for agricultural production and/or passenger transportation. The company carried dual traits as it operated as a subsidiary enterprise for peripheral profit while also playing a role in transportation.

• Proceedings of the KSR Conference
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• 2006.05b
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• pp.528-534
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• 2006

• Proceedings of the KSR Conference
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• 2006.05b
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• pp.999-1005
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• 2006

• Proceedings of the KSR Conference
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• 2002.10a
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• pp.272-280
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• 2002

The purpose of this study is establishing train-ferry system in Korea. Train-ferry system have a competition over present transportation system in international cargo trade market between Korea and China. And, the operation of train-ferry transportation system between Korea and China is meaningful project in the point of providing various choices to clients.