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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
Selecting the target year
Analytical Study to Check Safety of Folding-type Staircase in High Speed Rolling Stock
Lee, Weon-Dae ; Park, Sang-Kyu ; Lee, Kyung-Kyu ; Lee, Jeong-Hun ;
Journal of the Korean society for railway, volume 17, issue 2, 2014, Pages 87~93
DOI : 10.7782/JKSR.2014.17.2.87
The KTX, running in Korea but imported from Alstom Co. in France, has folding type staircases complying with European standard EN 4752. However, when operating, the step size is only 200mm, while the Korean standard step size is 253mm, a standard reflecting the average value of persons aged 20~60. From the aspect of kinesiology, the current step size can cause falls or slips during embarking and disembarking of passengers because body load is mostly focused on the heel and the current step is much more narrow than the standard size. Thus, we have performed an analytical study to check the safety of folding type staircases on the KTX after re-design.
An Exploratory Study on the Applicability of Thin-Film Photovoltaic Cells for Auxiliary Power Supply of a Personal Rapid Transit (PRT) Vehicle
Kang, Seok-Won ; Han, Soo-Jin ; Jeong, Rag-Gyo ; Oh, Hyuck Keun ; Ko, Sangwon ; Choi, Dooho ;
Journal of the Korean society for railway, volume 17, issue 2, 2014, Pages 94~99
DOI : 10.7782/JKSR.2014.17.2.94
Recently, trends in new transportation system development have been primarily focused on sustainable and ecofriendly mobility solutions. The personal rapid transit (PRT) system has been considered a promising candidate in this category; its competitiveness is being improved through convergence with cutting-edge electric vehicle (EV) technologies. However, battery-powered vehicles pose difficult technical challenges in attempts to achieve reliable and efficient operation. In this study, a design approach for a solar-power assisted PRT system is presented with small-scale demonstrations aimed at circumventing challenges facing its adoption, as well as helping speed the transition to electric-powered ground transportation. From the results, it is expected that flexible photovoltaic (PV) cells will be able to supply 11% of the power required by the service equipment installed in a prototype vehicle. In particular, flexible photovoltaic (PV) cells are advantageous in terms of cost, weight, and design considerations. Most importantly, the cells' flexibility and attach-ability are expected to give them great potential for extended application in various areas.
Simplified Shock Response Analysis for Submerged Floating Railway against Underwater Explosion
Seo, Sung-Il ; Sa-Gong, Myung ; Son, Seung-Wan ;
Journal of the Korean society for railway, volume 17, issue 2, 2014, Pages 100~105
DOI : 10.7782/JKSR.2014.17.2.100
To design a submerged floating railway that is safe against underwater explosions, railway behavior must be investigated and clarified. In this paper, shock waves and impulse pressures generated by a charge away from the submerged floating railway are expressed using experimental formulas. The submerged floating railway tethered by mooring lines is modeled as a simply supported beam with elastic springs. Finite element analysis for the beam model subjected to impulse loading is conducted so that the response of the submerged floating railway can be investigated. For design purposes, a simplified analysis method combined with dynamic load factor is proposed for the same model. Maximum deformation and internal forces are calculated and compared with the time dependent analysis results. It is shown that the simplified analysis results show good agreement.
Practical Evaluation Technique for Deterioration of Railroad Lines using Track Geometry
Kim, Hyun Ki ; Kim, Sung Jin ; Choi, Chan Yong ; Hwang, Soo Beom ;
Journal of the Korean society for railway, volume 17, issue 2, 2014, Pages 106~113
DOI : 10.7782/JKSR.2014.17.2.106
In this study, a practical evaluation technique to detect the deterioration of railroad lines by means of train performance and track geometry measures is suggested. A train that has a specific performance and is running the straight line can make minimum travel time (ideal time). But the actual travel time will be increased by the track geometry and various speed limitations. By comparing these travel times, we can easily define the degree of line deterioration. This method does not require complex vehicle performance measures and/or specifications that exceed those of typical Train Performance Simulations (TPS). For this reason, ease of use is ensured and the results are similar to those obtained by running a TPS for practical evaluations.
Application of a Simple Non Destructive Test Method to Obtain the Dynamic Modulus of Asphalt Mixtures used for an Asphalt Trackbed Foundation
Lim, Yujin ; Lee, SeongHyeok ; Lee, JinWook ; Lee, ByeongSik ;
Journal of the Korean society for railway, volume 17, issue 2, 2014, Pages 114~122
DOI : 10.7782/JKSR.2014.17.2.114
An asphalt trackbed is to be adapted in Korea to provide better bearing capacity and stability to the track and a comfortable ride to passengers. The dynamic modulus of Hot Mixed Asphalt(HMA) mixes is a critical design input parameter to determine the thickness of the asphalt trackbed. In this study, impact resonant tests and ultrasonic test methods are designed to obtain the dynamic modulus. These test methods are also verified to check the etffectiveness of constructing a master curve of the dynamic modulus over a wide range of frequencies and temperatures. The test results are compared to the computed dynamic modulus using AASHTO 2002 and the KPRP's proposed model. It can be concluded that the proposed simple test methods are effective to obtain the dynamic moduli of the asphalt mixes for the design of an asphalt trackbed foundation.
Analysis of Permanent Deformations in Asphalt Mixtures for Design of Asphalt Trackbed Foundation
Lim, Yujin ; Lee, JinWook ; Lee, SeongHyeok ; Lee, ByeongSik ;
Journal of the Korean society for railway, volume 17, issue 2, 2014, Pages 123~132
DOI : 10.7782/JKSR.2014.17.2.123
In this study, permanent deformation of asphalt trackbed was investigated by performing repetitive load test on specimen made with dense graded asphalt mixture that was specially prepared for asphalt trackbed foundation. The obtained test results were compared with those computed from the prediction model proposed by AASHTO 2002, called MEPDG. No prediction model adaptable only for permanent deformation of the asphalt trackbed foundation has yet been developed, so the prediction model by AASHTO was adapted in this study to simulate permanent deformation of trackbed foundations in asphalt slab track and in ballasted asphalt track. In order to simulate permanent deformation, a finite element analysis was performed to obtain stresses generated in trackbed due to wheel load. It was found that the predicted permanent deformation was much smaller than the anticipated deformation and that the asphalt track could be stable during the service life of the structure.
A Field-test Study of the Design Standards of Elevated Structures for Rubber-wheeled Light Rail Transit: Braking Force
Shin, Jeong-Ryol ; Lee, An-Ho ; Park, Jae-Im ; Shin, In-Jo ;
Journal of the Korean society for railway, volume 17, issue 2, 2014, Pages 133~139
DOI : 10.7782/JKSR.2014.17.2.133
Due to the absence of design guidelines for elevated light-rail structures in Korea, most elevated light-rail structures have been designed and constructed based on the design codes of conventional railway bridges and on the codes recommended by foreign vehicle manufacturers. This is the main reason why most elevated light-rail structures are massive or over-designed or poorly constructed economically. In this paper, the authors carried out field tests to analyze the braking forces caused by braking a train running at speeds of 50km/h, 60km/h, and 70km/h, acting on the elevated structures of rubber-wheeled Light Rail Transit (LRT) trains. The authors also briefly describe the analyzed results of the braking force acting on the substructures of elevated light-rail structures. The test-results presented here in this paper can be referenced when establishing design guidelines or standards for elevated structures of LRT systems.
An Iterative Linear Approximation Algorithm for a Unified Model of Traffic Assignment and Line Planning in Railway Networks
Park, Bum Hwan ;
Journal of the Korean society for railway, volume 17, issue 2, 2014, Pages 140~147
DOI : 10.7782/JKSR.2014.17.2.140
Line planning is an important step to determine the optimal frequencies of trains given the forecasted demand for each train type. The main input data for line planning is the leg traffic demand which can be derived using suitable traffic assignment models. However most assignment models require a line plan, in other words, train frequencies or headways, so that inconsistent results just by the procedural approach to find an optimal line plan after determining leg traffic can be avoided. This paper suggests a unified model that can consider the traffic assignment and line planning, simultaneously. We further provide an elaborated approximation algorithm and, finally, provide experimental results determined for the Korean railway network.
An analysis of the Relationship between Railway Dispatchers' Stress Factors and Job Satisfaction Levels
Kim, Jae-Yeon ; Kim, In ;
Journal of the Korean society for railway, volume 17, issue 2, 2014, Pages 148~155
DOI : 10.7782/JKSR.2014.17.2.148
This practical study investigates the effects of job satisfaction as a result of the stresses felt by many dispatchers who work in the subway industry in the Seoul metropolitan area. Factors that cause stress are assessed. The organization system, inappropriate compensation, workplace culture, and job requirements, among several types of organizational stresses are significantly related to job satisfaction. The results of the analysis indicate that there is a close link between job satisfaction and dispatcher communication factors. This paper suggests stress-relief measures for dispatchers who must handle a variety of civil complaints and improper communications with field departments based on the analysis of the answers to descriptive questionnaire items.