• 한국소음진동공학회논문집
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• 제23권3호
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• pp.199-208
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• 2013

So far today, there is a speed limit by the radius of curve based on operation regulation in domestic railway, however a study for the maximum running speed at the curved section without any derailment would be necessary. The two major factors related to the running safety of railway vehicle are classified as the railway vehicle condition and the track condition. In terms of the rail inclination among many other factors, the determination of rail inclination within the possible limit is necessary for the geometrical structure of the optimum track. The disregard of the geometrical parameter related to the rail inclination may cause a serious problem to the running safety of railway vehicle. This study is focusing on the analyzing of running safety regard to the change of rail inclination among the many other parameters to improve derailment safety, so that there is an affection analysis of the running safety regard to the change of rail inclination in the ideal and geometric track condition. Also There is an affection analysis of the running safety regard to the simultaneous change of rail inclination and the running speed at the curved section. According to analysis results of running safety, In case that the left and right rail inclination are 1/40, the running safety of this condition defined than other conditions. Also, the rail inclination of conventional lines is 1/40, Therefore, the railway vehicle passing through curve is safe when the railway vehicle runs in conventional lines.

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2008년도 추계학술대회 논문집
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• pp.327-328
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• 2008

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2012년도 춘계학술대회 논문집
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• pp.915-916
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• 2012

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2013년도 춘계학술대회 논문집
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• pp.851-852
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• 2013

• 한국정밀공학회:학술대회논문집
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• 한국정밀공학회 2012년도 추계학술대회 논문집
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• pp.977-978
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• 2012

• 무역학회지
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• 제41권3호
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• pp.109-133
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• 2016

유라시아의 지역적 중요성으로 인하여 주요 국가들이 유라시아와 관련된 국가대전략을 수립하고 있는데 그 대표적인 것이 중국의 일대일로전략과 한국의 유라시아 이니셔티브라고 할 수 있다. 한국의 유라시아 이니셔티브는 동북아 물류중심지화 전략이후에 수립된 박근혜정부의 창조경제기반 국가대전략으로서 유라시아의 미래를 위하여 역내국가들과 함께 하나의 대륙, 창조의 대륙, 평화의 대륙을 만드는 것을 목표로 하고 있다. 이러한 유라시아 이니셔티브에서 중요한 사업의 하나가 물류운송 네트워크 구축사업인데 물류운송 네트워크 구축사업은 유라시아 친선특급, 나진-하산 물류사업, 북극항로개척, 철도운송 네트워크로 살펴볼 수 있다. 본 논문은 유라시아 이니셔티브상의 철도운송네트워크 구축사업을 포함하여 유라시아 익스프레스 사업의 현황을 살펴보고 효율화방안을 모색함으로써 유라시아 물류 네트워크의 조기 구축에 기여함을 그 연구목적으로 한다.

• Steel and Composite Structures
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• 제29권2호
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• pp.219-229
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• 2018

This paper presents an analytical model to analyze the mapping relationship between bridge lateral deformation and track geometry of high-speed railway. Based on the rail deformation mechanisms, the deformation of track slab and rail at the locations of fasteners are analyzed. Formulae of rail lateral deformation are derived and validated against a finite element model. Based on the analytical model, a rail deformation extension coefficient is presented, and effects of different lateral deformations on track geometry are evaluated. Parametric studies are conducted to evaluate the effects of the deformation amplitude, fastener stiffness and mortar layer stiffness on the rail deformation. The rail deformation increases with the deformation of the girder, and is dependent on the spacing of the fasteners, the elastic modulus of the rail's material, and the moment of inertia of the rail's section.

• JSTS:Journal of Semiconductor Technology and Science
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• 제9권3호
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• pp.160-165
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• 2009

A 12b 2 MS/s cyclic ADC processing 3.3 Vpp single-ended rail-to-rail input signals is presented. The proposed ADC demonstrates an offset voltage less than 1 mV without well-known calibration and trimming techniques although power supplies are directly employed as voltage references. The SHA-free input sampling scheme and the two-stage switched op-amp discussed in this work reduce power dissipation, while the comparators based on capacitor-divided voltage references show a matched full-scale performance between two flash sub ADCs. The prototype ADC in a $0.18{\mu}m$ 1P6M CMOS demonstrates the effective number of bits of 11.48 for a 100 kHz full-scale input at 2 MS/s. The ADC with an active die area of $0.12\;mm^2$ consumes 3.6 m W at 2 MS/s and 3.3 V (analog)/1.8 V (digital).

• 한국철도학회논문집
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• 제13권2호
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• pp.201-207
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• 2010

철도 레일의 누적통과톤수에 의한 교체주기기준은 레일의 휨 피로수명에 의해 결정된다. 레일의 휨 피로수명을 평가하기 위해서는 기본적으로 레일의 휨 피로거동(S-N선도)에 대한 분석이 필요하다. 본 연구에서는 국내에서 사용되고 있는 50kg/m, 60kg/m 레일에 대하여 신품 및 사용 용접레일(모재부, 테르밋용접부, 가스압접부)로 구분하여 실물 휨 피로시험을 수행하였으며, 휨 피로시험결과를 바탕으로 파단유형 및 파단면 분석, 파괴 확률에 따른 휨 피로거동(S-N선도) 분석을 수행하였다. 이를 통해 레일종류별, 용접방법별, 신품 및 사용레일에 대한 S-N선도를 도출하였다. 이는 향후 누적통과톤수에 의한 레일 피로수명 평가를 위해 반드시 필요한 기초 자료로서 활용될 것으로 기대된다.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2007년도 추계학술대회 논문집
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• pp.1946-1950
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• 2007

Switch rail is a very important part on the railway track, which not only accounts for the safety of the passing trains but also greatly influences the speed of the train. The higher the speed and the loads of the train the more it demands on the properties of the switch rail. Research shows that the higher mechanical properties of switch rail the longer the service life. Induction heat treatment is a good way of improving the mechanical properties of metallic materials. But the switch rail's section area changes gradually across the lengthways, which is difficult for induction heating especially for the small section. And the mechanical property of small section of the switch rail is the most important for its service life. The induction heat treatment used past always brings the low hardness on small section which can cause low service life of switch for wearing, or too high hardness because of martensite microstructure which can cause the shelling or even breaking of the switch rail. To prolong the service life of switch rail by higher mechanical properties, we researched the improved induction heat treatment for switch rail by adjusting speed of heating, and adopting compressed air cooling. The results showed that switch rail obtain almost the same high hardness across the length way after the improved induction heat treatment, which is very helpful to extend the service life of switch rail.