• Proceedings of the KSR Conference
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• 2006.11a
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• pp.123-134
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• 2006

Putting the urban maglev train to practical use requires the systematic management to predict and solve the problems in advance, which are expected to occur in the operation of the vehicle, at each lifecycle step such as concept design, manufacture, commissioning and maintenance. In this article, we review the trend of international specification for railway RAMS and suggest the RAMS program from the viewpoint of system engineering. In addition, RAMS requirements for the advance into the foreign market are presented through the investigation of RAMS specifications for Metro transit in various principal countries. Lastly, we suggest the direction of RAMS research on maglev train for putting it to use by analysing the trend of RAMS researches in Japanese railway.

• Proceedings of the KSR Conference
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• 2005.11a
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• pp.1021-1027
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• 2005

The Diesel Multiple Units (DMU) is a successful mass transportation system, that is being, continuously, on demand by train operators and railway authorities around the globe. One of its advantages is the fact that a diesel engine, along with the correct propulsion and control equipment, could also be used on either Electrified or Non-Electrified Railway Lines. Currently, there are almost 12,000 DM Units being used worldwide and the demand is on the increase. This paper describes the special features as well as the advantages/disadvantages of the different types of the DMUs according to the propulsion systems that are employed, to help establish a trend in the DMU market.

• Proceedings of the KSR Conference
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• 2008.11b
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• pp.1807-1820
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• 2008

The station area development planed to improve the old and narrowed station and to enhance the train passenger's convenience through private capital attraction in the past. But it has been faced with difficulty for the creative of transfer demand. Because of lean upon building facilities were caused by shortage of business profitability as to development of the upside a railway line, and lack of public utilities. The station area development requires that it's trend to large scale development of station areas, korail's direct development, deputation of specialty company to development, collaboration between local government and korail in development, diversification of process & installed facility, building multi-transfer center and one-stop transfer system. This trend caused by low profitability in development of the upside a railway line. The purposes of study are to make the system and law reflected to the property of station area development, investment in kind of needed land, and change railroad areas to high-rise and complex development, and make a forum between government and korail, etc.

• Proceedings of the KSR Conference
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• 2009.05b
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• pp.649-655
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• 2009

Traffic safety and vibration serviceability of a railway bridge set a limitation to the application of long-span cable supported bridges even though the design trend of the bridge becomes longer and lighter. In the case of high speed railway, it becomes more severe for the high speed of the train and resonance of the structure. Therefore, the cable supported bridge does not exist in Korea high speed railway until now. On the other hand, in recent, Italia, Japan and China do design and construct the long-span cable supported bridges for high speed railway recently with overcoming of traffic safety and passenger comforts. In the present study, prior to analysis of traffic safety and passenger comforts, a extradosed bridge for common railway is re-designed for high speed railway. The difference of member forces and displacements by design live load, the difference of impact coefficient and variable stresses of cables are investigated.

• Korea Trade Review
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• v.44 no.4
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• pp.153-168
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• 2019

The logistics industry is changing with the diversification of demand and related technology development. Thus, the transportation system is also changing to social problems and environmental damage, and the importance of rail freight is increasing with changes in the international logistics environment. This study analyzes railway freight competition structure using freight volume and suggests improving the competitiveness of railroad freight. To achieve the research purpose, this study was conducted using the Hirshmann-Herfindahl Index(HHI) and Location Quotients(LQ) method. As a result, the concentration trend of railway trends has increased from 0.213 to 0.238 during the last 9 years, and LQ analysis has enabled the identification of local competition lines by item. The study result confirmed that policy measures on railway freight system, railway infrastructure construction and railway operation are necessary to enhance railway competitiveness.

• Journal of the Korean Society for Railway
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• v.11 no.4
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• pp.371-377
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• 2008

As a railway is receiving attention as an environment-friendly transportation mode, many high speed, inter-city and urban railway are constructed and remodeled in the world. With this trend, railway RAMS was included in the international standard IEC 62278 in 2002. RAMS activity in domestic market is also increased with this international trend. However, IEC 62278 does not describe the methodology of substantial contents like how reliability target is set although it can be used as an overall guideline when RAMS requirements are included in the purchase specification. That is because RAMS requirements should be set with the specific railway condition. It is required to fully understand the meaning of railway RAMS parameters and apply those correspond to the specific railway system and environment condition especially when a quantitative RAMS requirement is set. In this study, the meaning and characteristics of RAMS parameters applicable to the development of quantitative RAMS requirement of rolling stock is described. And the basic concept of RAMS and the definition of failure that IEC 62278 describes is modified and suggested in order to make more suitable to the development of quantitative RAMS requirement.

• Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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• 2008.04a
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• pp.529-533
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• 2008

Recently in Korea, noise is one of the most important social issues because the living standard becomes more higher. Railway noise is also annoying one in our society, although railway has very positive role in our country. The major measures for mitigation of railway noise in Korea are rail welding and installation of noise barrier on the noisy area. But these measures have its own limit for the calm and comfortable living environment. In Europe the railway noise problem has been treated more systematically and aggressively, there has been emission noise standard for Trans-European rail network. In this paper, the trend of noise standard for railway vehicles will be reported and the check point for our country will be discussed.

• International Journal of Safety
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• v.10 no.2
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• pp.16-20
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• 2011

The computer application on embedded system is recently more increased in accordance of the development of computer technology. In this trend, the depending of SW in embedded system, especially railway signaling system, is being increased further. So the testing for the safety of railway signaling system software became more important. Hence, the safety assurance of the vital software on the railway signaling system is very important but yet, not many works have been done. In this paper, we represented the implementation results of development of performance testing tool in railway signaling system. The implemented testing item had referred to the international standards in relation to the software for railway system, such as IEC 61508 and IEC 62279.

• Proceedings of the Korean Institute of IIIuminating and Electrical Installation Engineers Conference
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• 2007.11a
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• pp.53-57
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• 2007

The railway is an important industry which quickly, safely and accurately transports a great deal of people and goods compared to other methods of transportation. Because there is not enough manpower in this field, professional engineers are urgently demanded. Although there are many people who apply for the professional engineer examination, they do not know how and what to prepare for it. This paper has analyzed the pattern of questions in the examination for the last fifteen years and the tends of the examination and the subjects which have been taught in the railway related educational institutions for the last five years. It suggests the compulsory subjects for the qualification and an easy way to get it for those who prepare the examination for the based on this analysis.

• Proceedings of the KSR Conference
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• 2003.05a
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• pp.462-467
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• 2003

According to the computerization of railway signalling system, necessity of communication protocol for interface between these equipments is increasing. Therefore the research on communication protocol structure that is required according to computerization trend of these signalling goes. In our research the existed protocol currently used was analyzed, and the simulation modeling for performance analysis is deduced. Based on this simulation model the performance analysis and comparison is carried out, and also validation test is executed about new suggested protocol.