• Title/Summary/Keyword: Railways

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A Study on the Application of Noise Map in Urban Planning (도시계획에서 소음지도 활용방안 연구)

  • Ko, Joon-Hee;Chang, Se-Il;Lee, Seung-Il;Yi, Chang-Hyo
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2005.05a
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    • pp.905-910
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    • 2005
  • Increasing population in the cities, it has been demanded that urban planner should consider environmental problem. In this regard compact city has been strongly suggested as an environmental urban form which can reduce energy consumption. However, compact city can also cause noise problem, because residential buildings have to be located near roads and railways. In order to solve this problem, it is necessary for urban planner to examine the types of roads and railways before they are established. Noise map is able to be useful tool for the task.

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Study on Securing Train Braking Distances according to the Schedule Speed Improvement (표정속도 향상에 따른 열차제동거리 확보방안 연구)

  • Lee, Hoon-Koo;Kim, Jin-Chuol;Lee, Soo-Hwan;Lee, Boo-Hyum;Eum, Ki-Young
    • Proceedings of the KIEE Conference
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    • 2011.07a
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    • pp.1238-1239
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    • 2011
  • For the domestic railways, we carry out the speed-up project for the maximum speed, came out of the plan on the schedule speed improvement, such as the Gyeongbu HSR 1st and 2nd step project and the speed-up project of the major trunk railways. As the speed increase, we shall review the conventional calculation methods for braking distances and identify the increase of braking distances. In this way, we shall secure the safe braking distances.

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Damage to earth structures by the 2004 Niigata-ken Chuetsu earthquake in Japan and their rehabilitation works

  • Koseki, Junichi;Tsutsumi, Yukika
    • Proceedings of the Korean Geotechical Society Conference
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    • 2006.10a
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    • pp.430-433
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    • 2006
  • Damage to earth structures for roads, railways and residential areas, as well as dams and river levees, during the 2004 Niigata-ken Chuetsu earthquake in Japan, and their rehabilitation works are overviewed. Several influential factors are pointed out, such as a) heavy rainfall preceding the earthquake, b) large aftershocks, c) geological conditions for subsoil including existence of liquefiable layers, d) compaction degrees for embankment, and e) drainage capacity from subsoil/embankments. It is also reported that, in the reconstruction works of damaged roads and railways, preferred use of geogrid-reinforced soil retaining walls was implemented.

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Cases of Excavation Methods for Crossing Railway and Road (철도 및 도로 횡단공법 시공 사례)

  • Kim Dong joon;Park Yung ho;Lee Yoon bum;Lee Euncheol
    • Proceedings of the KSR Conference
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    • 2003.10b
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    • pp.429-435
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    • 2003
  • This paper presents the case studies of Tubular Roof construction Method(T.R.c.M) and Semi Shield method, which were applied to the tunnel excavation under the pre-existing railways. It was proved that T.R.c.M was an effective and safe method for the tunnel excavated in soft soil, giving little damage to the railways located a few meters above. Semi Shield was also performed successfully to bore a tunnel in soft and hard rock, minimizing the ground settlement and tilting of vulnerable fuel tanks. Site and soil conditions are also discussed, which led these relatively new methods to success. Finally, comparison of the measurement results and the design values are made to verify and improve the current design practice.

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Optimization of LTE-R Network using 2.6GHz Test Frequency in Daebul Test Line (2.6GHz 시험주파수를 이용한 대불선 시험선에서의 LTE-R 망 최적화)

  • KWAK, Woo-Hyun;KIM, Yong-Kyu
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.64 no.9
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    • pp.1398-1405
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    • 2015
  • Domestic railway communication in Korea has been introduced for mutual communications among control center, operation staffs, and maintenance staffs. It has been mainly used as railway disaster and safety functions from VHF and UHF from 1980’s and TRS-Astro and TRS-Tetra from the 2000’s. Recently for urban railways communications, 18GHz and 2.4GHz ranges have been utilized for image transmissions and control command communications, respectively. This paper analyzes technical development of LTE-R, LTE communication for Railways, that has been designed as a single integrated railway wireless network in order to merge the current various communication systems. In this paper, we present the details of the examination of the LTE-R test-bed using 2.6GHz test frequency in Daebul test line through CW test and optimization test.

Numerical Simulation of Dynamic Behaviour of a Gauge-changeable Freight Wagon (궤간가변화차의 동특성 수치해석)

  • Jang Seung-Ho;Lee Il-Seung
    • Journal of the Korean Society for Railway
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    • v.9 no.4 s.35
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    • pp.461-466
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    • 2006
  • In order to transport cargo rapidly and safely from the trans-Korean railway to the trans-Siberian railway having a different gauge, a gauge-changeable freight wagon can be used. Because the wagon is expected to run in South Korea, North Korea and Russia, it should have good dynamic performance in these railways. In this paper, the dynamic characteristics of a gauge-changeable freight wagon was analyzed numerically using ADAMS/Rail in each condition of the railways having different gauges and rail profiles. The wagon makes use of load sensitive friction damping and has highly nonlinear behaviour, which is modeled in detail as the full nonlinear dynamic model. It is shown that the running behaviour of the wagon is sensitive to changes in the rail gauge and profiles, however the assessment quantities from the point of view of safety, track fatigue and running behaviour are less than the limit valves.

Comparative study on internal and external SMS(Safety Management System) to improve the Korean railway's SMS (국내 철도 안전관리체계 개선을 위한 국내외 비교 연구)

  • Kang, Chul;Kim, Sa-Kil;Byun, Seong-Nam
    • Proceedings of the KSR Conference
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    • 2007.05a
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    • pp.538-542
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    • 2007
  • This study proposes SMS(Safety Management System) improvement of domestic railway by intensively comparing railway safety system overseas to reinforce domestic railway safety. UK railways well known the well-organized railway SMS has brought up safety issues on their process of private management. With this process, also, domestic SMS improvements is requested by increasing sense of the safety for general public. This study expects Korean railways to become a well-organized that as removing insecure factors of domestic railway based on result comparing and analyzing the manual, factors and requirements of guideline for internal and external SMS.

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A Study on the Optimum Stiffness of Concrete Slab Track (콘크리트 궤도의 최적 탄성에 관한 연구)

  • Kong, Sun-Yong;Kim, Sang-Jin
    • Proceedings of the KSR Conference
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    • 2007.05a
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    • pp.1085-1090
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    • 2007
  • In recent railway construction, the concrete slab track is getting highlighted as main stream in track type. However, it is the fact that there are different opinions in selection of the optimized spring coefficient of elastic pad. In this study, the performance of vibration reduction in different stiffness of rail pad for ballasted track was compared, and the changes in characteristics, such as static/dynamic deflection of components, vibration acceleration, insertion loss etc., were analysed by using ISI Program for various types of rail fastening system used in concrete slab track. It was concluded that the fastening system with softer pads has shown the better performance of vibration reduction in concrete slab track and the optimized static stiffness has been calculated to 21.1kN/mm for conventional railways, 17.6kN/mm for high-speed railways and 17.8kN/mm for subways.

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A Study on the Characteristics and Prediction of Noise from Railway Bridges (철도교량의 소음특성과 예측에 관한연구)

  • Kim, Jong-Rak;Shin, Min-Ho;Park, Jong-Koan;Eom, Ki-Yeong
    • Proceedings of the KSR Conference
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    • 2007.11a
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    • pp.545-550
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    • 2007
  • The objective of this paper is to suggest a characteristics of Noise and the Noise Prediction Model and the appropriate Noise Impact Mitigation Method for a elevated railway bridges construction. The characteristics on noises are investigated and evaluated according to a type of railway bridges such as steel, concrete and steel/concrete compound bridges, a types of train, a distance and height from railways. The noise prediction study has been made by the evaluation of differences between model values and in-situ measurement, around the railways. For the noise prediction, the Mithra program and the electronic properties of noises have been adopted.

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A Study on the Effect of Safety culture on safety in railway industry (철도산업에서 Safety culture 가 Safety에 미치는 영향에 관한 연구)

  • Heo, Eun-Mee;Kim, Sa-Kil;Byun, Seong-Nam
    • Proceedings of the KSR Conference
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    • 2007.11a
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    • pp.1783-1786
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    • 2007
  • The purpose of this study is to analyze human safety culture of the railway driver in domestic railway industry. This study proposes safety culture improvement of domestic railway by intensively comparing railway safety system overseas to reinforce domestic railway safety. Domestic railways well known the well-organized railway safety culture has brought up safety issues on their process of private management. With this process, also, domestic safety culture is requested by increasing sense of the safety for general public. This study expects Korean railways to become a well-organized that as removing insecure factors of domestic railway based on result comparing and analyzing the manual, factors and requirements of guideline for internal and external safety culture.

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