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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 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
Kinematic Envelope Analysis of the Urban Transit EMU based on PSD Installation
Chung, Jong-Duk ; Ohn, Jung-Ghun ; Pyun, Jang-Sik ; Park, Jang-Gon ; Lee, Jong-Woo ;
Journal of the Korean Society for Railway, volume 16, issue 6, 2013, Pages 447~453
DOI : 10.7782/JKSR.2013.16.6.447
Since PSDs(Platform Screen Doors) are set up at many subway stations, their design related to safety has become gradually important. In particular, the interference check with a running railway vehicle is the most important of performance indices because the collision between PSDs and vehicles can be dangerous for passengers in the car and on platforms. When the train comes into a station with a curvature, the passenger car has a large translational and rotational motion and the displacement is enough for coming in contact with PSD. The performance is affected by many design parameters such as rail design parameters and vehicle velocity. This study proposes dynamic analysis models for railway vehicles and rails. Some parameters were also considered in the models to determine their influence on the performance.
Analysis for Characteristics Method on Wind Pressure of Trains Crossing in Tunnel
Nam, Seong-Won ;
Journal of the Korean Society for Railway, volume 16, issue 6, 2013, Pages 454~459
DOI : 10.7782/JKSR.2013.16.6.454
Pressure waves are generated and propagate in a tunnel when train enters tunnel high speed. A compression wave due to the entry of train head propagates along the tunnel and is reflected at tunnel exit as an expansion wave. An expansion wave due to the entry of the train tail propagates along the tunnel and is reflected at tunnel exit as a compression wave. These pressure waves are repeatedly propagated and reflected at the tunnel entrance and exit. Severe pressure changes causes ear-discomfort for passengers in the cabin and micro pressure waves around the tunnel exit. It is necessary to analyze the transient pressure phenomena in tunnels qualitatively and quantitatively, because pressure change rate is considered as one of the major design parameters for optimal tunnel cross sectional area and repeated fatigue force on car body. In this study, we developed a characteristics method based on a fixed mesh system and boundary conditions for crossing trains and analyzed this system using an X-t diagram. The results of the simulation show that offsetting of pressure waves occurs for special entry conditions of a crossing train.
Modeling of Train Radio Propagation Affected by Ground Reflected Wave in High-speed Railway
Bae, Sung-Ho ; Song, Ki-Hong ; Choi, Kyu-Hyoung ;
Journal of the Korean Society for Railway, volume 16, issue 6, 2013, Pages 460~465
DOI : 10.7782/JKSR.2013.16.6.460
Radio propagation in a high-speed railway is affected by ground reflective waves that are due to irregular reflection by the railway track, which consists of rails, sleepers, and gravel. This paper provides a train radio propagation model that simulates an irregular track reflective wave as a random variable. A simulation study using the train radio propagation model shows that the path loss exponent is around 3.0, indicating a reduced path loss compared to the value of 4.0 in the general mobile radio environment. Regressive analysis of the received signal strength indicators measured in the Gyeongbu high-speed railway showed the results identical to those of the simulation. These results confirm the train radio propagation model and can be applied to the coverage estimation and the design of a train radio network.
Evaluation of the Degradation Trend of the Polyurethane Resilient Pad in the Rail Fastening System by Multi-stress Accelerated Degradation Test
Sung, Deok-Yong ; Park, Kwang-Hwa ;
Journal of the Korean Society for Railway, volume 16, issue 6, 2013, Pages 466~472
DOI : 10.7782/JKSR.2013.16.6.466
The use of a concrete track is gradually growing in urban and high-speed railways in many part of the world. The resilient pad, which is essentially when concrete tracks are used, plays the important role of relieving the impact caused by train loads. The simple fatigue test to estimate the variable stiffness of resilient pads is usually performed, but it differs depending on the practical conditions of different railways. In this study, the static stiffness levels of used resilient pads according to passing tonnages levels were measured in laboratory tests. Also, the simple fatigue test and the multi-stress accelerated degradation test for new resilient pads were performed in a laboratory. The static stiffness of the used pad was compared with the results of tests of usage times and cycles. The results of the comparison showed that the variable static stiffness levels of the used pad were similar to results of the multi-stress accelerated degradation test considering the fatigue and heat load. With a T-NT equation related to the degree of the multi-stress accelerated degradation, a model of multi-stress accelerated degradation for a resilient pad was devised. It was found through this effort that the total acceleration factor was approximately 2.62. Finally, this study proposes an equation for a multi-stress accelerated degradation model for polyurethane resilient pads.
Improvement Method of Sand Ground Using an Environmental Friendly Bio-grouting Material
Kim, Dae-Hyeon ; Sagong, Myung ; Park, Kyung-Ho ;
Journal of the Korean Society for Railway, volume 16, issue 6, 2013, Pages 473~481
DOI : 10.7782/JKSR.2013.16.6.473
The purpose of this research is to evaluate the improvements in the strength and injection range of loose ground after injecting
(created by microorganism reaction). For this purpose, three cases of single-layer (Sand, SP, SW) specimens were made in a 150mm D
200mm H space and two cases of multi-layer specimens (SW/SP, SP/SW) were made in a 150mm D
300mm H space. The specimens were made with a relative density of 30% of soft ground and an injection was given over a time of one day. The uniaxial compression strength was measured with a cone penetrometer and the injection range was observed by checking the bulb formation around the injection nozzle. Also, the compositions of the specimens were assessed through XRD analyses. Based on the test results, a compressive strength of 500kPa and 15cm thick cementation were noted due to the cementation of the soil. This implies that there are significant effects of the pore condition and size on bio-grouting technology.
Study on the Improvement and Effect of the Metro Fare System
Yim, Chul ; Lee, Yongsang ; Yoon, Kyoungman ;
Journal of the Korean Society for Railway, volume 16, issue 6, 2013, Pages 482~491
DOI : 10.7782/JKSR.2013.16.6.482
Current metro tickets are categorized into transportation cards and monthly season tickets, which offer limited consumer choices. A metro fare system should be introduced based on the diversity of customer demand. Thus, this study`s objective is that the metro fare system in Korea should be efficiently operated by analyzing a variety of metro fare systems used in major cities of other countries. In addition, this study proposed the following metro fare systems, one day pass, which is generally used in other countries in a bid to promote public transportation, reduce costs, and increase revenue. A commuting ticket system to increase the demand from cars to subways, and special discounts & a round-trip ticket system for round-trip travelers in case that demand is low was compared with the high supply on the Gyeongchun-line.
A Study of the Current Status and Issues Pertaining to Vertical Separation between Infrastructure and operation of the Korean Railway
Lee, Yongsang ; Chung, Byunghyun ;
Journal of the Korean Society for Railway, volume 16, issue 6, 2013, Pages 492~502
DOI : 10.7782/JKSR.2013.16.6.492
This paper analyzes the outcomes of railway reform in the form of vertical separation between the infrastructure and operation since 2004 in Korea. For the analysis, the paper reviewed theoretical issues and case studies of European and Japanese railway reforms efforts. By doing this, we find the implications and a standard model, most useful. Moreover, based on this analysis, the paper reviewed the status of the accomplishment of goals, including solution to current account deficits, improvements in competitiveness and greater efficiency of operations. Finally, the paper highlighted improvement measures to address the problems of railway vertical separation in Korea. This paper suggests specifications pertaining to rail policy and control methods; tower foundation and negotiations and mentions ways to establish legal institutionalization and to secure stable rail system investments in railway in Korea.
Connectivity Analysis of KTX Stations according to KTX Connection Characteristic Variable and KTX Modal Split
Shin, Hyun-Ju ; Kim, Byung-Kwan ;
Journal of the Korean Society for Railway, volume 16, issue 6, 2013, Pages 503~509
DOI : 10.7782/JKSR.2013.16.6.503
Since the opening of KTX, the number of people coming to KTX stations to use KTX has steadily increased. Passengers have a variety of access modes between a KTX station and their origin/destination. But there is no way to confirm the level of connection strength. So this study examines various connection characteristic variables that can show the connectivity, and examines influencing relationships, and chooses variables that affect connectivity by using a KTX modal split. We will suggest connectivity estimation models between a KTX station and origin/destination based on the selected connected variables.
Proposal of Wireless Communication Method and Candidate Frequency Band for Constructing the Integrated Radio Networks for Railroads
Park, Duk-Kyu ; Lee, Sang-Yun ; Yoon, Byungsik ; Kim, Yong-Kyu ;
Journal of the Korean Society for Railway, volume 16, issue 6, 2013, Pages 510~518
DOI : 10.7782/JKSR.2013.16.6.510
These days, interest in radio networks for railways has increased both at home and abroad. In response to this trend, not only the existing radio networks which focus on railway control signals but also the next-generation integrated radio network that can send videos and manage mass storage data are actively being investigated. This paper proposes wireless communication methods to establish integrated radio networks for railways. The paper further suggests a candidate frequency band that could be allocated as the frequency band for railways among the frequency bands currently used in Korea. Based on this paper, we can expect that the domestic railroad will operate more efficiently and that security and convenience of the railroad will reach a superior level. In addition, the Korean integrated radio networks for railways, which cope with the changes in the global technology market, will be established.
Technologies and Standards of Future Railway Mobile Telecommunication
Yoon, Byungsik ; Kim, Junsik ; Lee, Sukjin ; Kim, Kyung-Hee ; Kim, Yong-Kyu ; Park, Duk-Kyu ;
Journal of the Korean Society for Railway, volume 16, issue 6, 2013, Pages 519~527
DOI : 10.7782/JKSR.2013.16.6.519
Mobile radio technologies have evolved in the railway industry offering seamless connectivity and various functionalities to improve railway service. Recently, advanced mobile communication technologies have enabled a new level of railway customer services with more efficient railway operation. Since the LTE mobile communication technology offers many benefits and better performance for new railway services, it is considered to be a strong candidate for the future railway mobile telecommunication. However, communication networks in the railway sector are critical for secure operation and have stringent requirements for reliability and safety. In this paper, we explain the requirements for the future railway mobile telecommunication. The LTE, which would be the future railway mobile technology, is analyzed against these requirements. We also introduce the current state of standardization for the future railway mobile telecommunication and its implementation plan.
Feasibility Study of Improved Train Control System Using On-board Controller for Intelligent Control of Trackside Facilities
Baek, Jong-Hyen ; Jo, Hyun-Jeong ; Chae, Eun-Kyung ; Choi, Hyun-Young ; Kim, Yong-Gyu ;
Journal of the Korean Society for Railway, volume 16, issue 6, 2013, Pages 528~533
DOI : 10.7782/JKSR.2013.16.6.528
To improve the efficiency and safety of railway systems, the train control system has considerably evolved from the ground-equipment-based control system (e.g. track circuit, interlocking system, etc.) into the on-board-equipment-based control system. In addition, this train control system enables the rolling stock to intelligently control the trackside facilities by introducing information and communication technologies (ICT). Accordingly, since the ICT-based train control system simplifies the railway system (i.e. the heavy ground-equipment can be removed), an efficient and cost-effective railway system can be realized. In this paper, we perform a feasibility test of the ICT-based train control system using a simulation. To this end, we implement a test-bed consisting of prototype machines of on-board/ground equipment and introduce an integrated operation scenario for the train control. The simulation results satisfy all the requirements of train operation according to the scenario and show the effectiveness of the proposed train control system.
A Study on the Problem Analysis and Improvement Plan for the Korean Railways Communication Networks
Kim, Kyung-Hee ; Kim, Yong-Kyu ; Park, Duk-Kyu ;
Journal of the Korean Society for Railway, volume 16, issue 6, 2013, Pages 534~539
DOI : 10.7782/JKSR.2013.16.6.534
The research about the Korean integrated wireless network for railways is in progress. The network integrates and complements the various railway functions. In addition, the network is trying to change from wire communication to radio communication. The activities for the railway frequency acquisition are also in progress for the implementation of the network. This paper analyzes the problems for the Korean railway communication networks. The problems revolve around the dispersed network structure, the limited functions, the different communication methods, the technology limitation for the communication methods, and the usage of the non-licensed band. Subsequently, we explain the current state and trend for the foreign communication of the railways. This paper suggests improvement plans for the problems and also explains the expected efficiency for the improvement plans.
Bandwidth Requirement Estimation Method for Future Wireless Railway Communication Systems
Jeong, Minwoo ; Yoon, Hyungoo ; Park, Duk-Kyu ; Kim, Kyung-Hee ; Lee, Sukjin ;
Journal of the Korean Society for Railway, volume 16, issue 6, 2013, Pages 540~550
DOI : 10.7782/JKSR.2013.16.6.540
The Future Wireless Railway Communication System(FWRCS) has attracted attention for the various advantages of such a system like efficient management, precise periodicity of operation and speedy travel. Related to it, the area of bandwidth requirement estimation for the FWRCS is being researched actively because there is a great need for accurate bandwidth distribution. In this paper, sophisticated bandwidth requirement estimation method for FWRCS is proposed by modifying ITU-R M.1390. With this method, the expected frequency requirements for the present, for five years from now, and for 10 years from now can be calculated by applying the data gathered from the actual field.
Development of Integrated Wireless Network for Railway
Song, Yongsoo ; Kim, Yong-Kyu ; Baek, Jong-Hyen ;
Journal of the Korean Society for Railway, volume 16, issue 6, 2013, Pages 551~557
DOI : 10.7782/JKSR.2013.16.6.551
This research aims to conduct a study on the feasibility of the LTE communication method for developing a dedicated integrated railway wireless network. An empirical analysis was carried out by establishing a dedicated integrated railway wireless network in an approximately 12km section between Illo station and Daebul station on the Honam line. Korean wireless communication methods for railway safety are different depending on each line, which makes it difficult for railway workers to cooperate with. This causes various problems. There is the ever-present risk of accidents due to call disconnection between wireless communication systems, frequency interference from commercial networks, and crosstalk. This study verified the feasibility of the 4th generation communication system, LTE, over the dedicated integrated railway wireless network as a solution for the above mentioned problems. The result shows this communication system exceeded existing performance standards of Europe GSM-R in every test item despite the location constraint of train tracks on the base station establishment.