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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 17, Issue 6 - Dec 2014
Volume 17, Issue 5 - Oct 2014
Volume 17, Issue 4 - Aug 2014
Volume 17, Issue 3 - Jun 2014
Volume 17, Issue 2 - Apr 2014
Volume 17, Issue 1 - Feb 2014
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Structural Behavior Evaluation of Mg-GFRP Composite Single-Lap Bonded Joints With Different End Shapes
Kim, Jung-Seok ; Im, Jae-Young ; Lee, Woo-Geun ;
Journal of the Korean Society for Railway, volume 17, issue 6, 2014, Pages 391~396
DOI : 10.7782/JKSR.2014.17.6.391
In this study, the strength of magnesium-GFRP/epoxy single-lap bonded joints are experimentally evaluated with different end shapes. In order to achieve this, four different single-lap joints with different end shapes are fabricated and the failure load is measured under tensile loading tests. From the test results, the single-lap joint with a square end exhibits the lowest failure load while the single-lap joint with reverse tapering and a spew fillet has the highest stress values. It has 11.1% higher failure strength than the single-lap joint with a square end.
Verification of Calculated Hydrodynamic Forces Acting on Submerged Floating Railway In Waves
Seo, Sung-Il ; Mun, Hyung-Seok ; Lee, Jin-Ho ; Kim, Jin-Ha ;
Journal of the Korean Society for Railway, volume 17, issue 6, 2014, Pages 397~401
DOI : 10.7782/JKSR.2014.17.6.397
In order to rationally design a new conceptual submerged floating railway, prediction of wave forces applied to the structure is very important. In this paper, equations to calculate such forces based on hydrodynamic theories were proposed and model tests were carried out. Inertia forces and drag forces, calculated using Morison`s equation and the linear small amplitude wave theory, were in good agreement with the results from model tests conducted in a wave making tank. Drag forces were negligible compared with inertia forces. Also, wave forces showed linear variation with the changing wave heights. It was revealed that the linear wave theory and Morison`s equation can give a simple and useful solution for the prediction of wave forces in the initial design stage of a submerged floating railway.
A Distributed Wireless Local Area Network (WLAN) Access Scheme for Efficient WLAN Communication in Busy Train Stations
Koh, Seoung-Chon ; Choi, Kyu-Hyoung ; Kim, Ronny Yongho ;
Journal of the Korean Society for Railway, volume 17, issue 6, 2014, Pages 402~409
DOI : 10.7782/JKSR.2014.17.6.402
Wireless local area network (WLAN) is a widely used wireless access method due to its easy usability and excellent performance. However, its performance degrades significantly as the number of users increases. In busy train stations, where the number of WLAN users are large and, more importantly the number of simultaneous packet transmission attempts is extremely large due to the time synchronization upon train arrival, the packet transmission delay problem is very severe and almost impossible for WLAN stations to initiate communication with WLAN networks. In this paper, a novel distributed WLAN access scheme for efficient WLAN communication in busy train stations is proposed. Using the proposed scheme, WLAN access delay can be significantly reduced under highly congested traffic environments. Therefore, a significant performance enhancement for the WLAN performance used in the Communication Based Train Control (CBTC) can be achieved.
Concrete Lining Behaviors of Subway Tunnels according to Temperature Variations
Yoo, Ji-Hyeung ; Lee, Seung-Won ; Kim, Dae-Sung ;
Journal of the Korean Society for Railway, volume 17, issue 6, 2014, Pages 410~414
DOI : 10.7782/JKSR.2014.17.6.410
In this study, the behavior of urban subway tunnels is measured using instrumentation sensors installed in the lining concrete inside subway tunnels in order to analyze their behavior according to temperature variations. It is observed that the stresses of the concrete lining, tunnel convergence, and cracks change according to the temperature variations. However, the crack deformation differs depending on the size and status of the crack. In addition, this study proposes a correction formula for the lining stress and tunnel convergence through numerical analyses of the concrete lining according to the temperature variations. The results of this research can be used in the tunnel maintenance considering the tunnel behavior depending on the temperature variations in the tunnel.
Evaluation of Resilient Modulus for Reinforced Trackbed using Large Triaxial Tests
Lee, Sung Jin ; Lee, Jin Wook ; Lee, Seong Hyeok ; Sagong, Myung ;
Journal of the Korean Society for Railway, volume 17, issue 6, 2014, Pages 415~422
DOI : 10.7782/JKSR.2014.17.6.415
Reinforced trackbeds are an important layer that has a significant effect on the deformation of the track, therefore, a deeper understanding of reinforced trackbeds is necessary. In this paper, we conduct a large triaxial test in order to evaluate the resilient modulus (
) of reinforced trackbed materials through considering several factors such as the grain size distribution (GSD) and loading conditions. It is identified that the maximum size of the particle, GSD, and compacted water content affect the
but the loading frequency does not. Because these tests are performed with consideration of the field environment, the test results are useful for analyzing tracks including reinforced trackbeds. The data are limited to evaluating the parameters of
model; however the parameters of the deviatoric and bulk stress models that can be used in various loading conditions are proposed.
A Study on the Effects of KORAIL`s CSR on Customers` Reliability and Loyalty
Yang, Jae-Hoon ;
Journal of the Korean Society for Railway, volume 17, issue 6, 2014, Pages 423~432
DOI : 10.7782/JKSR.2014.17.6.423
The purchasing behavior of consumers is related to service quality and corporate social responsibility (CSR). Therefore, CSR is recognized as an important factor in company strategies. This study determines the relationship between the CSR activities of KORAIL and the reuse intention and recommendation intention of the consumer. CSR is composed of economic, legal, philanthropic, ethical, and environmental responsibilities. In the results of the structural equation modeling analyses, legal responsibility and economic reliability affect the reliability of KORAIL and this reliability affects the customers` reliability and loyalty. This paper proposes a compliance program, wagon safety information, customized tour packages, and communication strategy that will increase customer`s reliability and loyalty.
Evaluation of the Performance of Transit Assignment Algorithms for Urban Rail Networks
Jung, Dongjae ; Chang, Justin S. ;
Journal of the Korean Society for Railway, volume 17, issue 6, 2014, Pages 433~442
DOI : 10.7782/JKSR.2014.17.6.433
This paper evaluates the performance of transit assignment algorithms for urban rail networks. The accuracy of the algorithms is essential not just for travel forecasting but also for the area of applications such as the assessment of road vulnerability and the fare adjustments between train operating companies. Nonetheless, the suitability and caveats for the series of computational steps have not yet been much discussed. This study thus considers the characteristics that are appropriate for investigating Seoul rail travelers using three representative transit assignment algorithms: the optimal strategy algorithm, route choice algorithms, and the Dial`s algorithm. Both the theoretical foundation and the empirical performance are examined. The results demonstrate that the Dial`s algorithm is superior in terms of the theoretical soundness and the computational efficiency.
A Study on the Effect of Metro Employees` Perceived ISO Quality Management Employees on Customer Satisfaction Performance
Lee, Sang Oh ; Hwang-Bo, Jak ;
Journal of the Korean Society for Railway, volume 17, issue 6, 2014, Pages 443~451
DOI : 10.7782/JKSR.2014.17.6.443
This paper analyzes the differences in the organizational behavior of domestic Metro employees between enterprises with ISO quality management implemented and those without. Based on the required guidelines in ISO quality management, an empirical study on the effect of employee education and training, work processes, job satisfaction, and leadership on customer satisfaction performance is conducted. The results demonstrate that the work process in the ISO quality management certified enterprises exhibits a positive effect on customer satisfaction performance; however, the employee education and training did not exhibit immediate effects. In addition, job satisfaction and leadership are identified to have a mediating effect on the correlation between the work process, education and training, and customer satisfaction.
Deregulation and Rearrangement of the Government Role for the Railway Industry
Lee, Wonhee ; Kwon, Hyukjoon ;
Journal of the Korean Society for Railway, volume 17, issue 6, 2014, Pages 452~456
DOI : 10.7782/JKSR.2014.17.6.452
This article analyzes the new approach to regulation with regards to the railway industry and determines the government`s new role. For this purpose, the regulations are categorized into three dimensions (economic, societal and administrative), following the criteria adopted by the Regulatory Reform Committee. Furthermore, these items are analyzed as compulsory vs. incentive, and prior vs. ex post, according to the managerial characteristics. As a result, some recommendations were derived: the economic regulations should be deregulated and the societal regulations should be modified in order to rationalize the criteria. From this perspective, the government`s role needs to be repositioned in order to activate the railway industry.
Load Factor Decrease In The Seoul Metro Circle Line through Analyzing Passenger OD Demand
Eom, Jin Ki ; Song, Ji-Young ; Lee, Kwang-Sub ;
Journal of the Korean Society for Railway, volume 17, issue 6, 2014, Pages 457~465
DOI : 10.7782/JKSR.2014.17.6.457
This study proposes a policy for urban railway travel demand management system in order to decrease the load factor of the Seoul metro Circle line, particularly for the segment between Sadang and Samsung stations, through analyzing the transit smart card data. We propose mixed train operations of the existing Circle line and a line that goes toward Samsung station in order to transport passengers that have two distinct groups: those with the destination of Samsung station and those with destinations after Samsung station. The introduction of a mixed train operation that encourages passengers passing through Samsung station to take a Circle line train will decrease the congested load factor by 11.3% during the morning peak hours using the mixed train operation of the Circle and Samsung lines. This policy could be an effective method to decrease the load factor and improve the comfort of rail passengers without extra investment in the railway facilities.
An Efficient Model and Algorithm to Allocate Rail Track Capacity Considering Line Plans
Park, Bum Hwan ; Chung, Kwang Woo ;
Journal of the Korean Society for Railway, volume 17, issue 6, 2014, Pages 466~473
DOI : 10.7782/JKSR.2014.17.6.466
Recently, there is has been significant interest in the allocation systems of rail track capacities with considerations of the multiple train operating companies. The system indicates both a well-defined procedure and an algorithmic method to allocate the rail track capacities. Among them, this study considers the algorithmic method to derive the optimal timetable for the trains, which the companies propose together with their arrival and departure times at each station. However, most studies have focused on the adjustment of the departure and arrival times without conflicts, which could result in incompatible allocations with the line plan, which would result in an insufficient number of trains on each line to satisfy the demands. Our study presents a new optimization model and algorithm for the allocation problem in order to reflect the predetermined line plan. Furthermore, we provide the experimental results that were applied to the Korean high-speed railway network including the Suseo lines.