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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
Editor in Chief :
Volume & Issues
Volume 16, Issue 6 - Dec 2013
Volume 16, Issue 5 - Oct 2013
Volume 16, Issue 4 - Aug 2013
Volume 16, Issue 3 - Jun 2013
Volume 16, Issue 2 - Apr 2013
Volume 16, Issue 1 - Feb 2013
Selecting the target year
Vibration Reduction for a Railway Depot Building (I): Vibration/Noise Evaluation
Kim, Jeung Tae ;
Journal of the Korean society for railway, volume 16, issue 5, 2013, Pages 353~357
DOI : 10.7782/JKSR.2013.16.5.353
Property development along railway lines is a critical issue at present. Because various railway lines exist in most large cities, there are numerous properties and open spaces to be developed for communities associated with these lines. The active development of railway properties can be a means to resolve housing shortage problems in cities. In this first part of this paper, noise and vibration levels of an artificial area of land and apartment complex are measured and evaluated to derive a design strategy for vibration reduction purposes.
Vibration Reduction for a Railway Depot Building (II): Design Parameters
Kim, Jeung Tae ;
Journal of the Korean society for railway, volume 16, issue 5, 2013, Pages 358~364
DOI : 10.7782/JKSR.2013.16.5.358
In the second part of the paper, a design strategy for an apartment complex constructed at a railway depot is proposed for vibration reduction purposes. Various design parameters such as the vehicle operating speeds, artificial land behavior, housing support structure, and apartment sub-structures are individually examined to reduce the transmission of vibrations through building structures. Building construction on an artificial land should be subjected to regulations that require the application of a vibration reduction scheme based on the mechanics that govern the vibration transmission phenomena. The implementation of these parameters at an early design stage will provide a quiet living environment for residents who may be exposed to excessive noise and vibration.
A Study on Impact Testing of a Rolling-stock Windscreen
Jeon, Hong Kyu ; Park, Chan Kyoung ; Seo, Jung Won ; Jeon, Chang Sung ;
Journal of the Korean society for railway, volume 16, issue 5, 2013, Pages 365~371
DOI : 10.7782/JKSR.2013.16.5.365
This study describes impact test methods for a rolling-stock windscreen executed in Korea and Europe. Air-pressurized impact test equipment for the front windscreens of high speed trains was designed and manufactured. The equipment is capable of launching a projectile at 500km/h, in accordance with EN 15152's impact test method. Calibration of the test equipment was conducted to find an equation relating air pressure and projectile velocity. Specimens (
) having similar specifications with the front windscreens in metro and conventional trains were used to conduct impact tests with this equipment to research the impact characteristics of the screens according to the impact velocity.
Approximate Model for Peak Demand Power Computation in Metro Railway with DC Rectifiers
Kim, Han-Su ; Kwon, Oh-Kyu ;
Journal of the Korean society for railway, volume 16, issue 5, 2013, Pages 372~378
DOI : 10.7782/JKSR.2013.16.5.372
This paper presents an approximate model for computing the peak demand power in a metro railway system. The peak demand of substations can be calculated using the current vector iteration method. But the existing method requires many repeated calculations to determine the peak demand power, which makes it difficult to apply to the real-time peak power control problem. In this paper, we assume that none of the conditions vary except source impedance and make an approximate model for rapid calculation based on changes in the impedance of the power substation. The proposed model result is approximately the same as the existing model, which is demonstrated through simulation.
Applicability of IGM theory Partial Drilled Shaft constructed on Granite Rocks
Ahn, Tae-Bong ;
Journal of the Korean society for railway, volume 16, issue 5, 2013, Pages 379~385
DOI : 10.7782/JKSR.2013.16.5.379
In this study, partial drilled shafts (Bottom Cast-in-place Concrete pile) were applied to the pilot test site to ensure the bearing capacity; we used the skin friction force in the IGM to analyze the feasibility of the application of IGM theory. The soil characteristics were analyzed in cohesive, non-smear, and smooth conditions for the application of the IGM theory via geotechnical investigation and measurement of the disturbance and surface roughness. Static load and load transfer tests were conducted to calculate the allowable bearing capacity and the skin friction force by depth. The skin friction force increased with increase in the depth and standard settlement, showing a very high correlation. In addition, because the unconfined strength (
), which is the most important parameter in the cohesive IGM, cannot be measured in a weathered granite area, the static load and load transfer test results and the N value were used to obtain
Investigation of Stiffness Characteristics of Subgrade Soils under Tracks Based on Stress and Strain Levels
Lim, Yujin ; Kim, DaeSung ; Cho, Hojin ; Sagong, Myoung ;
Journal of the Korean society for railway, volume 16, issue 5, 2013, Pages 386~393
DOI : 10.7782/JKSR.2013.16.5.386
In this study, the so-called repeated plate load bearing test (RPBT) used to get
values in order to check the degree of compaction of subgrade, and to get design parameters for determining the thickness of the trackbed foundation, is investigated. The test procedure of the RPBT method is scrutinized in detail.
values obtained from the field were verified in order to check the reliability of the test data. The
values obtained from high-speed rail construction sites were compared to converted modulus values obtained from resonant column (RC) test results. For these tests, medium-size samples composed of the same soils from the field were used after analyzing stress and strain levels existing in the soil below the repeated loading plates. Finite element analyses, using the PLAXIS and ABAQUS programs, were performed in order to investigate the impact of the strain influence coefficient. This was done by getting newly computed
to get the precise strain level predicted on the subgrade surface in the full track structure; under wheel loading. It was verified that it is necessary to use precise loading steps to construct nonlinear load-settlement curves from RPBT in order to get correct
values at the proper strain levels.
Experimental Performance Estimate of a 40m PSC I Girder for Railway Bridges
Yeo, Inho ;
Journal of the Korean society for railway, volume 16, issue 5, 2013, Pages 394~401
DOI : 10.7782/JKSR.2013.16.5.394
Here we report the results of an experimental laboratory test to verify the applicability to railway bridges of a PSC I girder of which the upper flange thickness was increased to improve sectional performance. The thicker this flange is, the further upward the neutral axis is moved. If in this way the span length can be increased to 40m long, the bridge may be constructed with four girders instead of five. Therefore, construction cost could be lowered by reducing the weight of the long span structure due to increased sectional efficiency. It was also necessary to be certain that the dynamic performance of this relatively flexible structure would be applicable to railway bridges. Therefore numerical analysis, as well as static and dynamic tests, was carried out for a full-size PSC I girder. Based on these results, it was verified that the performance of the PSC I railway bridge satisfied the performance criteria of the design code.
Study of the Metropolitan Rapid Transport System to Minimize Sidetrack Construction
Kim, Moo Sun ; Kim, Jungtai ; Kim, Taesik ; Park, Sung Soo ; Hong, Jae Sung ; Cho, Yong Hyeon ; Min, Jai Hong ;
Journal of the Korean society for railway, volume 16, issue 5, 2013, Pages 402~409
DOI : 10.7782/JKSR.2013.16.5.402
In metropolitan railway systems, the average commuting time keeps increasing as the scheduled speed increases, and this leads to a decline of rail service usage and competitiveness. Therefore, effective express operation for urban trains is required to improve the scheduled speed. In this study, based on the obtainable time shortening efficiency and economic viability, several express operations are suggested for urban railways and these suggestions are compared by considering high performance trains with acceleration/deceleration and maximum speed improvement. As a result, the optimum express system, which can minimize the cost for sidetrack construction, is suggested.
Effects of Service Convenience on Customer Satisfaction and Reuse Intention by Korail Talk App Users among Korail Passengers
Seo, Ju-Hwan ; Kim, Young-Taek ;
Journal of the Korean society for railway, volume 16, issue 5, 2013, Pages 410~417
DOI : 10.7782/JKSR.2013.16.5.410
The purpose of this study was to analyze the effect of service convenience on customer satisfaction and reuse intention by 200 passengers using a Korail talk app. The result of the analysis showed that service convenience was positively correlated with satisfaction in Korail customers using the Korail talk app. Also, customer satisfaction with service convenience had a positive effect on reuse intention in these users. However, service convenience was not significantly correlated with customer's reuse intention. The results of this study suggest that it is important for Korail to offer improved service convenience for Korail talk app users consistently in order to improve customer satisfaction and reuse intention by Korail passengers.
A Study of Appropriate Amounts and Applicable Ranges of the Travel Time Values of Goods in Korea
Choi, Changho ; Park, Dongjoo ;
Journal of the Korean society for railway, volume 16, issue 5, 2013, Pages 418~429
DOI : 10.7782/JKSR.2013.16.5.418
This study assesses the appropriate amounts and applicable ranges of travel time values for freight transport modes in Korea. The findings suggest that it is possible to determine appropriate sizes and applicable ranges of travel time values of goods set for road transport mode (i.e. truck), whereas those for railway, inland waterway, marine, and air transport modes are not as easily estimated. The adequate travel time value for trucks is 20,000won/vehicle hour, and the application range of travel time value of trucks is 17,000~23,000won/vehicle hour considering other variables. The most adequate estimation method of determining the travel time value for road transport is the wage rate method, whereas the marginal rate of substitution method is more rational for railway, inland waterway, marine, and air transport modes considering the application purpose and characteristics of the goods transported.
The Effects of Emotional Burnout and Empowerment, and Organizational Commitment on Cooperation Behavior and Safety Behavior: Focus on Railway Controllers and Railway Engineers
Hwang-Bo, Jak ;
Journal of the Korean society for railway, volume 16, issue 5, 2013, Pages 430~438
DOI : 10.7782/JKSR.2013.16.5.430
An empirical study on railway controller and railway engineer who work in a domestic railway corporation was undertaken to verify the effects of emotional burnout and empowerment and organizational commitment on cooperation and safety behavior. The results of the analysis confirmed that the relations between emotional burnout, empowerment and organizational commitment as well as the relations between cooperation and safety behavior had negative effects. In contrast, the results of the analysis confirmed that empowerment and organizational commitment had positive effects on safety behavior and cooperation, and were effective because of all interactions among emotional burnout, safety behavior and cooperation. In conclusion this study convincingly demonstrates that emotional control, empowerment and organizational commitment of controller and engineer are important factors to secure safe operation of trains based on high safety behavior and cooperation behavior.
A Market Taxonomy Approach for the Export of Korean Railway Systems
Choi, Sung-Ho ;
Journal of the Korean society for railway, volume 16, issue 5, 2013, Pages 439~446
DOI : 10.7782/JKSR.2013.16.5.439
The market taxonomy approach may lead to the most effective strategy to promote the export of Korean Railway Systems. By prioritizing opportunities in the global marketplace and subsequently identifying market segments, this approach will reveal the most effective market strategies for Korean rail exporters. This study suggests the market potential index. In addition, it also introduces how market segmentation should be done for the global rail supply market. Applying the market taxonomy to derive strategic implications, this study portrays several export projects currently being undertaken by the Korean rail industry.