• 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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• 2003.10c
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• pp.640-645
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• 2003

최근의 도시철도 추진시스템은 VVVF 인버터로 제어되기 때문에 대부분 회생제동의 기능을 갖추고 있다. 회생제동 시 발생되는 전력은 그 때의 동일 노선에서 역행하고 있는 열차에 추진에너지로 사용되는 것이 가장 효율적이나 그것이 가능하지 않을 경우 혹은 그렇게 사용하고도 남는 잉여회생에너지가 발생할 경우 변전소의 회생용 인버터를 통해 역사 내에서 소비되는 방법도 많이 응용되고 있다. 이를 위해서는 회생용 인버터가 변전소 내에 설치되어야 한다. 본 논문에서는 경량전철시스템의 급전 시스템에서 이러한 회생용 인버터의 경제성분석과 적정용량 및 위치에 관에 논의된다.

• Proceedings of the KSR Conference
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• 2006.11b
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• pp.402-406
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• 2006

There are two types of railway alignment design. First type is a modification of existing railway and second type is a planning of whole new alignment. Modification of existing railway would be more simpler, usually, main scope is improving a capacity with adopting standard track gauge, straighten intensively curved part. But planning new alignment should be considered various factors, not only topographic feature, but cultural, socio-economical, environmental factors. This paper is based on the performed project in the United Arab Emirates, the Arabian Peninsular, with Korea railroad corporation, Korea Rail Network Authority, and other skilled Korean design firms participated on May, 2006.

• Proceedings of the KSR Conference
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• 2006.11b
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• pp.968-973
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• 2006

Although Gyeonggi-do is the core area which has a quarter of the population of Korea, it has poor railway network and then it have got serious traffic problem. So in this paper, it is introduced the improving methods of railways on Gyeonggi-do. In first, it was showed a fast and effective railway route implementation according to the characteristics with the similar population but the 17 times bigger area than that of Seoul. And it was explained multipurpose using method of the railways of Gyeonggi-do whit subway, commuter, express and high speed train etc. Finally unlike Seoul subway focusing on approachability, it was proposed 'express train paradigm' focusing on implementing the high movability which railways of Gyeonggi-do must have. So with 'Bundang-line' metropolitan railway, the case study in applying to southern metropolitan area with those suggestion was showed.

• Proceedings of the KSR Conference
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• 2007.11a
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• pp.1647-1656
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• 2007

With the growing international consensus regarding sustainable development of transportation, the plan of transportation infrastructure needs to meet various requirements toward enhancing environmental conditions. Accordingly, the upcoming long-term plan of high-speed rail network has to be reflecting the sustainability of transportation systems. In this paper, we propose methodologies based on multi-attribute utility theory for determining priorities of sustainable high-speed rail investment. The proposed methodologies identify indicators for sustainable transportation systems such as economic, environmental, social, and transportation-related ones and then, explain the way how to evaluate the overall sustainability by comparing the relative importance among indicators. This will help transportation agencies to prioritize high-speed rail investment toward sustainable transportation systems.

• The Journal of The Korea Institute of Intelligent Transport Systems
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• v.15 no.6
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• pp.36-46
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• 2016

Separate transportation card readers that record the amount of transfer volume occurring during movement in-between lines within the metropolitan railway transfer stations do not exist. This research proposes a model to estimate passenger transit movements in transfer stations that adequately reproduces characteristics arising during a transfer trip. The model used in this study assumes that passengers adopt transfer behaviors that minimize their generalized costs during transfer trips. Further, two measures are sought in order to reflect attributes of the metropolitan railway. The first is that similar paths connect origin and destination stations. For this, the M-Similar Paths method is applied to the model to identify the similar paths that arise. The second is that passengers perceive increasing number of transfers as additional transfer costs, which is reflected by means of the Stepwise Transfer Coefficient. Two case studies of metropolitan railway are used to propose measures for analysis of transfer trips. Twenty directional transit phenomena are reproduced for Sindorim railway station. Aggregate directional transit(A), aggregate inter-line transit(B), and B/A are calculated on a percentage basis for 33 metropolitan railway transfer stations, and using this, the functional role of transfers is explored.

• Journal of the Korean Society for Railway
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• v.20 no.2
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• pp.275-287
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• 2017

During the feasibility study of new rail lines, maintenance cost of railway infrastructure has mostly been estimated based on the track length and on simplified parameters; however, the estimation reliability can be improved by employing the correction factor from UIC 715, as well as the line classification in UIC 714. The correlations between maintenance cost and various parameters such as weighted track length based on line classification, radius of curvature, gradient and worn -out rate have been analyzed according to the case studies. Prediction of the maintenance cost has been carried out using the cost data, which were representative of the whole cost data; as a result, it was demonstrated that a cost model based on the line classification and the correction factor was more reliable than the existing models. Furthermore, possibilities of using data from both the track measurement vehicle and from the maintenance information system, which are under development, have been investigated and, based on this investigation, a combined cost model using line classification, radius of curvature, gradient and worn-out rate, among other factors, will be proposed in the near future.

• KSCE Journal of Civil and Environmental Engineering Research
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• v.38 no.6
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• pp.941-947
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• 2018

Station transfers for smart card based railway networks refer to transfer pedestrian movements that occur at the origin and destination nodes rather than at a middle station. To calculate the optimum path for the railway network, a penalty for transfer pedestrian movement must be included in addition to the cost of within-car transit time. However, the existing link label-based path searching method is constructed so that the station transfer penalty between two links is detected. As such, station transfer penalties that appear at the origin and destination stations are not adequately reflected, limiting the effectiveness of the model. A ghost node may be introduced to expand the network, to make up for the station transfer penalty, but has a pitfall in that the link label-based path algorithm will not hold up effectively. This research proposes an optimal path search algorithm to reflect station transfer penalties without resorting to enlargement of the existing network. To achieve this, a method for applying a directline transfer penalty by comparing Ticket Gate ID and the line of the link is proposed.

• Proceedings of the KSR Conference
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• 2011.05a
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• pp.790-795
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• 2011

When railway crossing is required to be improved to improve road traffic efficiency, cost-benefits analysis is conducted. In the analysis, such benefits as the reduction of the delay in road vehicle traffic and related costs and reduction of traffic accidents have been appropriately estimated, however, which has not been the case for the reduction of railway operation costs and accidents. This omission may result in a significant difference in the total estimation of the benefits achievable in a long railway line where many of the crossings are improved or reconstructed. This would deteriorate the rationality of the benefit analysis. As the result, although there are various, significant benefits recognizable in the improvement of railway crossings, but they have not been included in the list of the benefits due to the difficulty in calculation. To this end, this paper proposes a methodology of the calculation of the benefits of railway crossing improvement by estimating the unit costs used in the estimation of the benefits obtainable by the reduction of the railway operation costs and the reduction of the accidents at a crossing on the basis of past studies and data.

• Proceedings of the KSR Conference
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• 2008.06a
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• pp.2316-2324
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• 2008

In this paper, I illustrate the some examples of socio-economic influence of railroad in Korea. The Korean railroad has been running for 109 years now since it started operation in 1899. The opening of railroad in Korea has been affecting influence in our society not only transportation but also infrastructure building and the formation of new cities which they were built along the rail network like Daejeon. I have come up with some examples, which railroad has affected the in our society. For example, the changes of transport route from road to railroad, emerging the new cities, industries and culture. This paper contributes to look over the various function of railroad in Korea. Moreover it will be compared with Japan's railroad influence in his country. It gives us a peculiarity and universality in railroad's function including colonial policy