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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Korean Society for Railway
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Journal DOI :
Korean Society for Railway
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Volume & Issues
Volume 14, Issue 6 - Dec 2011
Volume 14, Issue 5 - Oct 2011
Volume 14, Issue 4 - Aug 2011
Volume 14, Issue 3 - Jun 2011
Volume 14, Issue 2 - Apr 2011
Volume 14, Issue 1 - Feb 2011
Selecting the target year
Study on the Removal of Carbon Dioxide in the Subway Cabin Using Zeolite Type Carbon Dioxide Adsorbent
Cho, Young-Min ; Park, Duck-Shin ; Kwon, Soon-Bark ; Lee, Ju-Yeol ; Hwang, Yun-Ho ;
Journal of the Korean Society for Railway, volume 14, issue 1, 2011, Pages 1~5
DOI : 10.7782/JKSR.2011.14.1.1
High concentration of carbon dioxide at subway cabin is one of the serious environmental concerns because carbon dioxide causes drowsiness, headache, and nervelessness of passengers. Ministry of Environment set a guideline for indoor carbon dioxide levels in train or subway in 2007. In this study, a carbon dioxide removal system for subway cabin was developed and tested using a test subway cabin. Various types of modified zeolites were used as the adsorbent of carbon dioxide. The tested zeolites were applied to the subway cabin, and showed high potential to lower the indoor
Setting the Service Reliability Target for Meeting the Punctuality Requirement of the Railroad System
Kim, Jong-Woon ; Park, Jun-Seo ; Chung, In-Soo ;
Journal of the Korean Society for Railway, volume 14, issue 1, 2011, Pages 6~10
DOI : 10.7782/JKSR.2011.14.1.6
This article deals with a problem of setting reliability targets of the railroad systems where the punctuality target is given to the operator and a penalty is imposed for the year when the target is not met. The operator should set the reliability targets of the railroad system and sub-systems because the reliability affects the expected number of years when the penalty is imposed. This paper presents a procedure for setting the service reliability target and equations to calculate the expected number of years when the penalty is imposed and the probability that the operator should pay the penalty per year according to the mean kilometer between service failures of the railroad system and sub-systems.
Study on a 2-Dimensional Dynamic Modeling Technique to Analyze the Overriding Phenomena of Rollingstock
Kim, Geo-Young ; Koo, Jeong-Seo ; Kwon, Tae-Soo ;
Journal of the Korean Society for Railway, volume 14, issue 1, 2011, Pages 11~18
DOI : 10.7782/JKSR.2011.14.1.11
This paper proposed a new 2-D multi-body dynamic modeling technique to analyze overriding behaviors taking place during train collision. This dynamic model is composed of nonlinear springs, dampers and masses by considering the deformable characteristics of carbodies as well as energy absorbing structures and components. By solving this dynamic model for rollingstock, energy absorbing capacities of collision elements, accelerations of passenger sections, impact forces applied to interconnecting devices, and overriding displacements can be well estimated. For a case study, we chose KHST (Korean High Speed Train), obtained crush characteristic data of each carbody section from 3-D finite element analysis, and established a 2-D multi-body dynamic model. This 2-D dynamic model was simulated under the train-to-train collision scenarios, and evaluated with 3-D virtual testing model. It was founded from the simulation results that this 2-D dynamic model could well predict overriding behaviors, and the modeling technique of carbody deformation was very important in overriding estimation.
A Study to Estimate Transmission Loss of HST using a Small Scale Reverberation Chamber
Kim, Tae-Min ; Kim, Jeung-Tae ;
Journal of the Korean Society for Railway, volume 14, issue 1, 2011, Pages 19~23
DOI : 10.7782/JKSR.2011.14.1.19
The method to reduce interior noise of train was being studied. To improve transmission loss of train is one of the best way to reduce interior noise. But, the estimate to transmission loss requires lots of the commercial costs. In this study, the method to estimate transmission loss of high speed train is proposed using a scale reverberation chamber. The result shows that a transmission loss estimated using small scale reverberation is similar to that using huge reverberation chamber. The transmission loss estimated based on small scale reverberation chamber can be optimal with respect to the commercial coasts.
Slope Stability Analysis Considering Multi Failure Mode
Kim, Hyun-Ki ; Kim, Soo-Sam ;
Journal of the Korean Society for Railway, volume 14, issue 1, 2011, Pages 24~30
DOI : 10.7782/JKSR.2011.14.1.24
Conventional slope stability analysis is focused on calculating minimum factor of safety or maximum probability of failure. To minimize inherent uncertainty of soil properties and analytical model and to reflect various analytical models and its failure shape in slope stability analysis, slope stability analysis method considering simultaneous failure probability for multi failure mode was proposed. Linear programming recently introduced in system reliability analysis was used for calculation of simultaneous failure probability. System reliability analysis for various analytical models could be executed by this method. For application analysis for embankment, the results of this method shows that system stability of embankment calculate quantitatively.
Improvement of Procedures on Design Deliberation System for Turnkey and Alternative-Design Contracts
Park, Hong-Tae ; Lee, Yang-Kyoo ;
Journal of the Korean Society for Railway, volume 14, issue 1, 2011, Pages 31~38
DOI : 10.7782/JKSR.2011.14.1.31
Turnkey and alternative-design contracts was introduced operation in the country from january 2004 to February 2010. this was introduced operation. The selecting method of contractor for turnkey projects has being operated by an open forum type that consists of technical committee and appraisal committee in an integrated design approach deliberations. But to improve the operation of the problems, the government is operating design review committee consisting of the central, local and special design advisory committee in march 2010. But this system has also been suggested as still problems, too many contracts by large companies, increasing of design cost and excessive competition. This study is intended to contribute that turnkey and alternative-design contracts can be well operated in domestic construction markets. In this paper suggests some improvement methods and operational problems caused from application of an open forum type for selecting contractor of turnkey project.
A Study on 3D Evaluation and Reduction Method for Vibration of Track-Roadbed due to Railway Load
Kang, Bo-Soon ;
Journal of the Korean Society for Railway, volume 14, issue 1, 2011, Pages 39~48
DOI : 10.7782/JKSR.2011.14.1.39
The paper describes four practical cases of railway structure concerning a three-dimensional numerical approach to analyse dynamic soil-structure interaction(SSI)of railway tracks on layered soil under transient load in the time domain. The SSI-Model has been implemented in TDAPIII accounting for nonlinear properties of the track and soil. The approach can be also be used to calculate vibration propagation in the soil and its effect on nearby buildings and structure. The Method is applied to analyse the dynamic response of railway tracks due to a moving wheel set. Finally some sample are given in order to reduce the vibration at the point of emission, at the transmission path and the structure itself.
A Comparative of Ground Stress with Difference of the Fixed Point Loading and Moving Wheel Loading
Choi, Chan-Yong ; Shin, Eun-Chul ; Eum, Ki-Young ; Shin, Min-Ho ;
Journal of the Korean Society for Railway, volume 14, issue 1, 2011, Pages 49~56
DOI : 10.7782/JKSR.2011.14.1.49
In this paper, it was compared the characteristics of the stress and settlement that occur from a track on the ground using a model test and has quantitatively analyzed the difference based on stress path and effect of the rotation of principal stress. Under identical roadbed conditions, the settlement generated by moving wheel loads were found to be 6 times and 3 times larger than that from static loads and cyclic loads, respectively. The deviator stress affecting shear deformation and the length of stress path generated by moving loads were twofold or greater increase than those by static loads. Furthermore, the stress path generated by moving loads was approached more closely to Mohr-Coulomb failure criteria compared to that by static loads. Also, it was found that ballasted track was occurred about 60% of maximum stress at
of the rotation angle of principal stress and was affected with rotation of principal stress with moving wheel loading condition.
Traffic Safety & Passenger Comforts of a Suspension Bridge Considering Seismic Loads
Kim, Sung-Il ; Kim, Dong-Seok ;
Journal of the Korean Society for Railway, volume 14, issue 1, 2011, Pages 57~65
DOI : 10.7782/JKSR.2011.14.1.57
The estimation of traffic safety and passenger comfort when the train is running on the bridge is a estimation unique to the railway bridge. The standards for such estimation are included in the Eurocode, the Shinkansen design criteria, and the design guideline of the Honam High-speed railway. The items are bridge responses including vertical displacement of bridge, vertical acceleration, and slab twist. In principle, a direct estimation based on the train responses has to take place. However, the estimation based on the bridge responses can be seen as an indirect estimation procedure for the convenience of the bridge designer. First, it is general practice that traffic safety can be verified as a derailment coefficient or wheel load decrement The general method of estimating passenger comfort is to calculate the acceleration within the train car-body. Various international indexes have been presented for this method. In the present study, traffic safety and passenger comforts are estimated directly by bridge/train interaction analysis. The acceleration and wheel load decrement are obtained for the estimation of traffic safety and passenger comforts of a suspension bridge which has main span length of 300m. Also, the consideration of seismic load with simultaneous action of moving train is done for bridge/train/earthquake interaction analysis.
A Study on the Train Composition Requirements for Safety Operation of Urban-Transit
Jeon, Young-Seok ; Lee, Hi-Sung ; Wang, Jong-Bae ;
Journal of the Korean Society for Railway, volume 14, issue 1, 2011, Pages 66~72
DOI : 10.7782/JKSR.2011.14.1.66
In order to assure the safety of train operation, a safety function analysis corresponding hazardous events of railway accidents and a safety requirement review on operation & management of trains have been performed. The preconditions and train composition requirements such as safety principles and functions that should be essentially considered to enable the safety operation of Urban-Transit trains are clearly presented. On the basis of presented train composition requirements, a rational revise of Urban Railway Operation Rule is proposed. It will be helpful in accident prevention and safety improvement for railway operation.
Case Analysis and Statistical Characteristics of a Railroad Weather-Related Accidents and Incidents each Railroad Line in the Korean Peninsula
Park, Jong-Kil ; Jung, Woo-Sik ; Lee, Jae-Su ; Kim, Eun-Byul ;
Journal of the Korean Society for Railway, volume 14, issue 1, 2011, Pages 73~79
DOI : 10.7782/JKSR.2011.14.1.73
This paper aims to find out the statistical characteristics of railroad weather-related accidents and incidents of each railroad line and then reduce the railroad accidents and prepare for the climate change. For this, we used data of KROIS and Korea railroad accidents report during 1996-2008. The results are as follows; Gyeongbu line is the most vulnerable line to railroad weather-related accidents, Yeongdong and Taebaek line are also the vulnerable line. The main railroad weather-related accidents and incidents is a railway obstruction and the next is a signal failure, a power supply failure. The second cause of a railway obstruction was some different for each line, but the main cause was a collapsed roadbed. We knew that the cold front accompanied with a heavy rainfall for a short time is the main weather pattern which cause the railroad accidents.
Empirical Analyses on Public Involvement Impact for Master Plan of New Transit System
Kim, Yeon-Kyu ;
Journal of the Korean Society for Railway, volume 14, issue 1, 2011, Pages 80~86
DOI : 10.7782/JKSR.2011.14.1.80
The purpose of this study is to develop conflict management considering justification of planning decision by public involvement (PI) in the context of Korea as an approach to prevent conflicts for railway projects and to achieve consensus building between public and governments. In this study, to evaluate the effectiveness of conflict management in the process of railway planning, we examined the before and after survey on the light rail transit (LRT) planning that was previously conducted. We first conducted estimation on the causal relationships among factors related to acceptance of LRT planning by structural equation model. The estimation results show that conflict management activities and acceptance are positively related. We also discussed as follows: the level of recognition of railway project influences positive effects regardless of conflict management activities, the most important factor with respect to the acceptance is awareness for planning necessity.