• KSCE Journal of Civil and Environmental Engineering Research
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• v.43 no.5
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• pp.651-657
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• 2023

Railroad alignment improvements and operating speed increase occupy considerable portion in recent railroad market. Developing countries have limitations to construction of new high speed railroads due to the burden of budgets and the lack of demands, and the projects of operating speed increase arepracticallyrecommended. Thisstudy developed the methodologyto provide the railroad alignment design alternatives and the costs by upgrading the "Intelligent Railroad Alignment Design Program (ei-Rail)" which has been used to obtain the alignment plans and construction costs for railroad construction projects. The program provides the cost for alignment improvement, design drafts and the effects of operating speed increase with the input of target improvement speed and the prevailing railroad alignment on the numerical map. It is then expected for the ei-Rail program to be used for the supporting tool for the railroad alignment improvement projects.

• 종축개량
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• v.19 no.1
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• pp.68-84
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• 1997

한달 간의 미국선형심사연수를 받으면서 교육받은 선형심사 대상형질의 중요성을 설명하고 미국목장을 직접 방문하면서 피부로 느낀 미국 낙농가들의 긍지와 자부심 및 낙농박람회 일정을 소개하고자 한다.

• Journal of the Korean Society for Railway
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• v.18 no.5
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• pp.457-465
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• 2015

A method of evaluating the optimal alignment range while considering ride comfort when performing line renewal of curved tracks for speed-up is proposed in this study. The proposed method was applied to analyze the optimal renewal range for horizontal alignments with the smallest curve radii in the Kyung-Bu high-speed line; a parametric study on the effects of various initial design conditions on the permissible renewal range and optimal alignment range was also performed. From the analysis results, it was found that the permissible range is enhanced in proportion to the increase in the curve radius and the cant. It was also verified that a slight adjustment of the horizontal alignment enables speed-up even in the case of R7000/R8000, placed in the ballasted track section of the Kyung-Bu high-speed line.

• 종축개량
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• v.11 no.1 s.59
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• pp.88-99
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• 2006

• 종축개량
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• v.7 no.2
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• pp.4-6
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• 1985

• 종축개량
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• v.9 no.12 s.58
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• pp.76-88
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• 2005

• International Journal of Highway Engineering
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• v.10 no.3
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• pp.33-46
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• 2008

A two-lane highway has a high rate of head-on collisions, sideswipe collisions, crashes with an fixed object. This study was to analyze the weakness of a cross section and a horizontal curve in a two-lane highway and find countermeasures to improve the traffic operations and safety. This study evaluated the effectiveness of widening, curve flattening and superelevation, verified it with a case study and assessed the economical efficiency. This study selected the difference between tangent section operating speeds and curve section operating speeds as an evaluation index of horizontal curve section in a two-lane highway. The results indicated that curve flattening is the best way to improve the traffic safety in a two-lane highway. This study has implication that it provides the quantitative effects of curve flattening. Also directions for future study were discussed.

• 종축개량
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• v.14 no.1
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• pp.38-40
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• 1992

• 종축개량
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• v.19 no.5
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• pp.70-75
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• 1997

• 종축개량
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• v.12 no.7 s.77
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• pp.64-71
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• 2007