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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
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Journal of the Korean society for railway
Journal Basic Information
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
Selecting the target year
A Study on the Effects of Cross-sectional Dimension Change of Brake Pad Specimen on the Uncertainty of the Compressive Strength
Park, Soo Hong ; Park, Jin Kyu ; Kim, Si Wan ; Park, Chan Kyoung ;
Journal of the Korean society for railway, volume 17, issue 4, 2014, Pages 223~227
DOI : 10.7782/JKSR.2014.17.4.223
The brake pad is one of the basic brake elements of a railway vehicle. It accomplishes braking action by friction between a pad and a brake disc. Because the brake pad must endure specified high pressure, the compressive strength is managed as the main performance factor. The standards for measuring the compressive strength of brake pads are KRS, KRCS, and KRT. These standards specify the size of the test piece for measuring compressive strength as
). To reduce the uncertainty of the compressive strength, factors of uncertainty were analyzed. The results show that changing the dimensions of the cross section was useful to reduce the uncertainty. The uncertainty due to the new cross-sectional dimension shows the effectiveness of reducing uncertainty.
Relation between Induced Voltage of Rail and Feeding Line of Wireless Power Transfer System for Railway Application
Kim, JaeHee ; Park, Chan-Bae ; Jung, Shin-Myung ; Lee, Seung-Hwan ; Lee, Byung-Song ; Lee, Jun-Ho ; Lee, Su-Gil ;
Journal of the Korean society for railway, volume 17, issue 4, 2014, Pages 228~232
DOI : 10.7782/JKSR.2014.17.4.228
The magnetic field generated by the feeding line of a wireless power transfer system induces voltage on the rail of a railway system. The induced voltage of the rail can have a bad influence on the track circuit and on safety. This paper simulated three feeding lines to study the relation between the feeding lines and the induced voltage of the rail; it also proposed magnetic field distribution of the feeding line to reduce the induced voltage.
Verification of an Analysis Method for Maglev Train-Guideway Interaction Using Field Measurement Data
Lee, Jin Ho ; Kim, Lee Hyun ; Kim, Sung Il ;
Journal of the Korean society for railway, volume 17, issue 4, 2014, Pages 233~244
DOI : 10.7782/JKSR.2014.17.4.233
In this study, an analysis method for maglev train-guideway interaction is verified using field measurement data. The cabin and bogies of the maglev train are modeled as rigid bodies that are allowed to have heave and pitch motions. Levitation forces from the electromagnetic suspensions on the bogies are controlled using an active control algorithm. The guideway is represented using the Euler-Bernoulli beam. Considering rigorously the changes in air-gaps and material points at which the levitation forces are applied due to the pitch motions of the bogies, dynamic analysis of maglev train-guideway interaction is performed. Using field measurement data, obtained from the Incheon Airport Maglev Railway, the analysis method is verified. Accuracy of the analysis method is investigated. It is determined that the structures in the railway are designed and constructed safely according to the design code for maglev railways.
Influence of Rail Supporting Spacing of Railway Bridge Deck Ends on Bridge-Track Interaction Forces
Choi, Jun-Hyeok ;
Journal of the Korean society for railway, volume 17, issue 4, 2014, Pages 245~250
DOI : 10.7782/JKSR.2014.17.4.245
This paper, as a study for the serviceability design of railway bridges with concrete track, presents the effects of design parameters of tracks and bridges on the forces acting on the rail supports of the track. To calculate the forces acting on the track, an unequal spacing discrete supported model with different spacing of rail supports was induced. Design parameters are the rail support spacing of expansion joints above abutments or piers of bridges, the distance from the support of a girder to the last rail support on the end of the girder, and the number of additional rail supports. The causes of the displacement of track are axial force, unit vertical displacement, and unit rotation. From the analysis, the maximum compressive force and the maximum uplifting force acting on the rail supports were determined and the effects of the rail support spacing on the forces acting on the track were presented.
Real-scale Accelerated Testing to Evaluate Long-term Performance for Bridge/Earthwork Transition Structure Reinforced by Geosynthetics and Cement Treated Materials
Lee, Il-Wha ; Choi, Won-Il ; Cho, Kook-Hwan ; Lee, Kang-Myung ; Min, Kyung-Chan ;
Journal of the Korean society for railway, volume 17, issue 4, 2014, Pages 251~259
DOI : 10.7782/JKSR.2014.17.4.251
The transition zone between an earthwork and a bridge effect to the vehicle's running stability because support stiffness of the roadbed is suddenly changed. The design criteria for the transition structure on ballast track were not particular in the past. However with the introduction of concrete track is introduced, it requires there is a higher performance level required because of maintenance and running stability. In this present paper, a transition structure reinforced with geosynthetics is suggested to improve the performance of existing bridge-earthwork transition structures. The suggested transition structure, in which there is reinforcing of the approach block using high-tension geosynthetics, has a structure similar to that of earth reinforced abutments. The utilized backfill materials are cement treated soil and gravel. These materials are used to reduce water intrusion into the approach block and to increase the recycling of surplus earth materials. An experiment was performed under the same conditions in order to allow a comparison of this new structure with the existing transition structure. Evaluation items are elastic displacement, cumulative settlement, and earth pressure. As for the results of the real-scale accelerated testing, the suggested transition structure has excellent performance for the reduction of earth pressure and settlement. Above all, it has high resistance the variation of the water content.
Evaluation of the Structural Behavior Characteristics and Long Term Durability for Transition Track Systems in Railway Bridge Deck Ends
Lee, Kwangdo ; Jeong, Incheol ; Choi, Jungyoul ; Park, Yonggul ;
Journal of the Korean society for railway, volume 17, issue 4, 2014, Pages 260~269
DOI : 10.7782/JKSR.2014.17.4.260
Transition tracks are an alternative for enhancing the long-term serviceability and durability of concrete track components in railway bridges. The goal of this paper is to investigate the structural behavior for transition track systems of railway bridge deck ends. In this study, the structural behavior of transition tracks such as the variations in static, dynamic, and fatigue behaviors and dynamic properties (natural frequency and damping ratio) are assessed and compared through performing loading tests and finite element analyses using actual vehicle impact loadings. As a result, it is found that the structural behavior of the transition track system is expected to satisfy the actual vehicle impact loading, and the variation in the neutral axis and dynamic characteristics are not affected by the fatigue loading. Therefore, it is inferred that the structural capacity and long-term durability of the transition track system is proven.
Prediction of Crack Pattern of Continuously Reinforced Concrete Track Induced by Temperature Change and Shrinkage of Concrete
Bae, Sung Geun ; Choi, Seongcheol ; Jang, Seung Yup ; Cha, Soo Won ;
Journal of the Korean society for railway, volume 17, issue 4, 2014, Pages 270~280
DOI : 10.7782/JKSR.2014.17.4.270
In this study, to examine the causes of cracks in continuously reinforced concrete tracks (CRCTs) and the main factors affecting cracking, a field survey on the status of cracks and crack patterns in the Gyeong-bu high speed line was conducted, and the crack patterns of CRCT due to the temperature difference between the top of the slab (TCL) and the bottom of the subbase (HSB) and the drying shrinkage of concrete were predicted by a nonlinear finite element model considering the structure of CRCT. The results of the numerical analysis show that cracks will be developed at the interface between the sleeper and the TCL, and under the sleeper due to the temperature difference and concrete shrinkage. This corresponds well to the crack locations found in the field. Also, it is found that the most significant factors are the coefficient of thermal expansion with respect to the temperature difference, and the drying shrinkage strain with respect to shrinkage. According to the results, the reinforcement ratio should be carefully determined considering the structures of CRCT because the crack spacing is not always proportional to the reinforcement ratio due to the sleepers embedded in the TCL.
Experimental Study on the Evaluation of Behavior for Floating Track System Using a Resilient Rubber Mat
Lee, Siyong ; Jeong, Incheol ; Choi, Jungyoul ; Park, Yonggul ;
Journal of the Korean society for railway, volume 17, issue 4, 2014, Pages 281~288
DOI : 10.7782/JKSR.2014.17.4.281
The objective of this study was to estimate the vibration reduction capacities of a floating track system using a resilient rubber mat, and to compare the results with the track support stiffness and track impact factor of a conventional slab track system by performing field tests using actual vehicles running along a service line. The theoretically designed track support stiffness and track impact factor were compared with the measured track support stiffness and track impact factor for each tested track. The calculated and measured track support stiffness of the floating track system were found to be similar, and the floating track system satisfied the design specifications of the track impact factor. The overall vibration level and track support stiffness of the floating track system were thereupon found to be significantly lower than those of the conventional slab track system. The experimental results thus showed that the vibration reduction effect of the floating track system is greater than that of the conventional slab track.
Effect of KORAIL Tour Conductors' Emotional Labor on Customer Orientation: Moderating Effect of Perceived Organizational Support
Hur, Chan-Young ; Kim, Tae-Seong ;
Journal of the Korean society for railway, volume 17, issue 4, 2014, Pages 289~296
DOI : 10.7782/JKSR.2014.17.4.289
This study analyzes, based on survey of the behavior of 288 railroad tour conductors. how deep acting and surface acting, which were both classified as emotional labor, influence customer orientation. It also analyzes the moderating effect of POS (perceived organizational support) on emotional labor and customer orientation. The following are the summarized results of the analysis. First, railroad tour conductors' deep acting has a positive influence on customer orientation. And surface acting has a negative effect on it. Second, after the moderating effect of POS has been studied, it is found that POS does not appear to have a moderating effect on customer orientation of deep acting but does appear to have a moderating effect on customer orientation of surface acting. In conclusion, this study implies that it is important, to railroad tour conductors, that organizational level support enhance customer orientation; it is also important to manage railroad tour conductors' emotions in order to enhance customer orientation.
A Study on the Korean Railway Property during the South Manchuria Railway Period
Bae, Eunsun ; Chung, Byunghyun ; Lee, Yongsang ;
Journal of the Korean society for railway, volume 17, issue 4, 2014, Pages 297~306
DOI : 10.7782/JKSR.2014.17.4.297
This paper analyzes Japan's consignment management of the Chosun Railway to the South Manchuria Railway. While Chosun Railway was entrusted, its management style differed significantly from that of Japan's direct management. After eight years of trust management, the direct management of Chosun Railway was returned to Japan. This of beyond border trust management is very rare. In addition, the management of Chosun Railway by South Manchuria Railway, which had an operation style similar to that of a private company, led to changes in Chosun Railway. This research analyzes the four key traits of South Manchuria Railway's consigned management. The first key trait is the initial Korean infrastructure and operation separation model. The second key trait is the international transportation and administration segregation. The third key trait is that it expanded the railway related businesses and led to the establishment of private railway companies. The fourth key trait is that the continental linked transportation was activated. Through analyses, it would be to create a comparative study of the resulting East Asian countries' operations. Furthermore, this research will in investigating the nature of Chosun Railway.
Forecasting Passenger Transport Demand Using Seasonal ARIMA Model - Focused on Joongang Line
Kim, Beom-Seung ;
Journal of the Korean society for railway, volume 17, issue 4, 2014, Pages 307~312
DOI : 10.7782/JKSR.2014.17.4.307
This study suggested the ARIMA model taking into consideration the seasonal characteristic factor as a method for efficiently forecasting passenger transport demand of the Joongang Line. The forecasting model was built including the demand for the central inland region tourist train (O-train, V-train), which was opened to traffic in April-, 2013 and run in order to reflect the recent demand for the tourism industry. By using the monthly time series data (103) from January-, 2005 to July-, 2013, the optimum model was selected. The forecasting results of passenger transport demand of the Joongang Line showed continuous increase. The developed model forecasts the short-term demand of the Joongang Line.
A Study on the Additional Train Scheduling Method
Kim, Young-Hoon ; Rim, Suk-Chul ;
Journal of the Korean society for railway, volume 17, issue 4, 2014, Pages 313~319
DOI : 10.7782/JKSR.2014.17.4.313
Additional train scheduling is often required to increase the capacity of transporting passengers or freight. In most previous studies on scheduling additional trains, operation time of the added train is designated first; and then the train operation feasibility is examined. However, it is often difficult to apply this approach to domestic trains because the density of the railroad network in Korea is high and various types of trains are in use. Moreover, for freight trains, it is even more challenging because the delay is accumulated due to lower priority whenever a freight train and a passenger train contend for a common segment of rail. In this paper, we address the additional train scheduling problem which entails finding a feasible schedule for an additional train having a fixed departure time or departure time windows. The problem is modeled as a mixed integer programming and a column generation technique is used to solve it.