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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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Korean Society for Railway
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Volume & Issues
Volume 14, Issue 6 - Dec 2011
Volume 14, Issue 5 - Oct 2011
Volume 14, Issue 4 - Aug 2011
Volume 14, Issue 3 - Jun 2011
Volume 14, Issue 2 - Apr 2011
Volume 14, Issue 1 - Feb 2011
Selecting the target year
A Study on the Architecture-based Model of High Availability of Railway Control Systems
Lee, Kyoung-Haing ; Kwon, Yong-Soo ;
Journal of the Korean Society for Railway, volume 14, issue 2, 2011, Pages 87~93
DOI : 10.7782/JKSR.2011.14.2.87
This work describes an availability model of highly available systems to achieve Five-9`s availability. Modern railway systems have raised users` expectations of powerful "always on" services. The crucial characteristics of these highly available services are essential to many modern businesses area, such as telecommunications, railway systems, information operations, Web-based businesses, and so on. The architecture-based model of system availability is useful to assess the feasibility of meeting a high availability target. The Markov model approach is straightforward for relative system engineers to adapt when they model highly available system failure and the failure recovery process. This work proposed the improved availability model through UML2.0. It is shown that the architecture-based model of system availability is a good reasonable by its application of the railway systems.
Stress Reduction Methods of GFRP/Mg Single Lap Bonded Joints : Finite Element Analysis
Kim, Jung-Seok ; Yoon, Hyuk-Jin ; Hwang, Jae-Yeon ;
Journal of the Korean Society for Railway, volume 14, issue 2, 2011, Pages 94~99
DOI : 10.7782/JKSR.2011.14.2.94
In this study, the stress reduction effect was evaluated for GFRP/Mg single lap bonded joints according to six different adherend shapes. Six different types of the single lap joint specimen were modeled and assessed using geometrically nonlinear finite element analysis. Moreover, three dimensional effect of stress distribution for the different adherend shapes was investigated. From the analysis, the dissimilar single lap bonded joint with the normal tapering and without the spew fillet (model 2) showed the highest stress values. In contrast, the peel stress values of both the square ended adherends with the spew fillet (model 3) and the reverse tapered adherends with the spew fillet (model 5) were 65.8% and 65.5% lower than the reference model.
Study on Development of Flexible Pad for High Speed Train Disk Brake
Lee, Min-Gyu ; Kim, Joo-Yong ; Kim, Jae-Min ; Yang, Young-Min ; Kim, Sang-Ho ; Cho, Chong-Du ;
Journal of the Korean Society for Railway, volume 14, issue 2, 2011, Pages 100~108
DOI : 10.7782/JKSR.2011.14.2.100
This paper investigates the structural stability and reliability on improving performance of flexible brake pad used in high speed train. To this end, an improved model of flexible pad was obtained through structural analysis. Brake pad specimens were subjected to modal, stroke and endurance tests to examine the dynamic characteristics and mechanical stability. The hot spot generation with increasing rotational speed was observed on chassis dynamometer equipment and then the structurally uniform contact between the disc and pad was achieved. The temperature distribution of flexible pad was measured using the infrared camcorder. Hence, the proposed flexible pad showed the better structural stability and thermal energy emission.
Failure Mode Analysis and Friction Material Development of the KTX tread Brake
Baek, Jong-Kil ; Goo, Byeong-Choon ; Koo, Jeong-Seo ;
Journal of the Korean Society for Railway, volume 14, issue 2, 2011, Pages 109~115
DOI : 10.7782/JKSR.2011.14.2.109
The shoe brake of the KTX is used in low speed when the electric brake is not effective. The main purpose of the shoe brake is to stop the train to a desired stop point at the station. Lots of defects have been encountered in the shoe brake unit since the KTX started its operation. To improve the reliability of shoe brake unit of the KTX power car, first of all, failure modes of the KTX shoe brake unit were analyzed. Main failure modes are cracks in the shoe friction material and fracture in the welded joints of the shoe backing steel structure. Several methods to remove the defects of the shoe brake unit were proposed and on-board tests were carried out: Increase of the strength of the shoe key and shoe cam, which decreased a little the occurrence of cracks in the shoe friction material; Redesign of the shoe backing steel structure, which eliminated the occurrence of the cracks in the backing plate but could not solve completely the crack problem in the shoe friction material; Development of a new friction material, which with redesign of the shoe backing steel structure could solve satisfactorily the crack problem in the shoe friction material.
The Design and Analysis of Recognition Structure for Absolute Train Positioning System of High-speed Maglev Train System
Shin, Kyung-Ho ; Shin, Duc-Ko ; Lee, Jae-Ho ; Lee, Kang-Mi ;
Journal of the Korean Society for Railway, volume 14, issue 2, 2011, Pages 116~120
DOI : 10.7782/JKSR.2011.14.2.116
For the train positioning system currently applied in high-speed MAGLEV train systems, it is classified into absolute positioning systems which discontinuously detect train positions, and relative positioning systems which continuously detect train positions. In this paper we analyze the configuration model and the numerical model of the absolute positioning system applied in TRANSRAPID which is a representative high-speed MAGLEV train, and design the two configuration models specific to the recognition structures of absolute positioning systems. We also verify the compatibility of the design models of absolute positioning system through simulation using MATLAB and propose the optimal configuration model of absolute positioning systems for high-speed MAGLEV train system.
A Study of RAMS Analysis and Assessment Activities for Automatic Train Protection System based on ERTMS/ETCS Level 1
Shim, Kyu-Don ; Lee, Jong-Woo ;
Journal of the Korean Society for Railway, volume 14, issue 2, 2011, Pages 121~129
DOI : 10.7782/JKSR.2011.14.2.121
This paper presents the methods to acquire the Safety Certificate from Independent Safety Assessment based on the IEC or EN standard which is commonly applied to railway system for Automatic Train Protection (ATP) system in accordance with ERTMS/ETCS Level 1 system. This also shows approach methods and relative activities for project lifecycle to accomplish and ensure the system requirements of ATP system, RAMS and system quality activities. These kind of activities for quality assurance of ATP system to obtain Safety Certificate could improve the quality of domestic railway system based on On-Board system of ERTMS/ETCS Level 1 and also contribute to the growth of railway business.
A Study on Realization of Speech Recognition System based on VoiceXML for Railroad Reservation Service
Kim, Beom-Seung ; Kim, Soon-Hyob ;
Journal of the Korean Society for Railway, volume 14, issue 2, 2011, Pages 130~136
DOI : 10.7782/JKSR.2011.14.2.130
This paper suggests realization method for real-time speech recognition using VoiceXML in telephony environment based on SIP for Railroad Reservation Service. In this method, voice signal incoming through PSTN or Internet is treated as dialog using VoiceXML and the transferred voice signal is processed by Speech Recognition System, and the output is returned to dialog of VoiceXML which is transferred to users. VASR system is constituted of dialog server which processes dialog, APP server for processing voice signal, and Speech Recognition System to process speech recognition. This realizes transfer method to Speech Recognition System in which voice signal is recorded using Record Tag function of VoiceXML to process voice signal in telephony environment and it is played in real time.
A Speed Increasing Test of BIMODALTRAM for Dynamic Response Analysis of Pipe-truss Bridges
Kim, Hee-Ju ; Jun, Myung-Il ; Cho, Eun-Sang ; Hwang, Won-Sup ;
Journal of the Korean Society for Railway, volume 14, issue 2, 2011, Pages 137~142
DOI : 10.7782/JKSR.2011.14.2.137
A bimodal tram is a new design vehicle introduced to improve a current transportation system, and it has advantages of a bus and a subway. A pipe truss bridge, an exclusive road of the bimodal tram, is constructed for introduction of the bimodal tram. An analysis of dynamic response characteristics is required because this new bridge has never constructed before. A speed increasing test on the pipe truss bridge was conducted with attaching a sensor to bottom of the bridge. Also, Dynamic response characteristics were analyzed by measuring displacements, the maximum vertical and horizontal acceleration about the new bridge through the experiment.
Air-tightness Evaluation of Tube Structures for Super-speed Tube Railway Systems: I. Analytical Modeling and Material Test
Park, Joo-Nam ; Nam, Seong-Won ; Kim, Lee-Hyeon ; Yeo, In-Ho ;
Journal of the Korean Society for Railway, volume 14, issue 2, 2011, Pages 143~150
DOI : 10.7782/JKSR.2011.14.2.143
This paper presents a preliminary study for air-tightness evaluation of vacuum tube structures for super-speed tube railway systems. The formula for flow rate of the air caused by the pressure difference of the inside and outside of the tube structure is derived based on Darcy`s law. A test is then performed to measure the air-permeability of concrete with various compressive strengths, the result of which is used for analytical simulation of the air intrusion for a tube structure with a preliminarily defined section. It has been shown that concrete with the compressive strength of at least more than 50MPa is recommended for effective operation and maintenance of the vacuum pump systems, as the air-permeability of concrete is inversely proportional to the exponent of its compressive strength.
Air-tightness Evaluation of Tube Structures for Super-speed Tube Railway Systems: II. System Test and Parametric Analysis
Park, Joo-Nam ; Kim, Lee-Hyeon ; Nam, Seong-Won ;
Journal of the Korean Society for Railway, volume 14, issue 2, 2011, Pages 151~159
DOI : 10.7782/JKSR.2011.14.2.151
This study performed an experimental study for air-tightness performance evaluation of concrete tube structures with joints. The test specimens consist of a continuous concrete tube, a concrete tube with a joint in the middle, and a segmented concrete tube. The test is performed in such a way that the inner pressure of the tube is dropped down to 0.1atm and the increase of the pressure is monitored with time. An equivalent air permeability is then calculated based on the test results. The results show that, as expected, a structure with more joints or bonds tends to be less air-tight. A sensitivity study shows that the system air-tightness performance level becomes higher as either the diameter or the thickness of the tube increases. Moreover, the increase in the diameter or the thickness of the tube makes an effort to enhance the air-tightness more effective.
Dynamic Response Characteristics for Two-layered Trackbed Structure by Train Load
Lee, Il-Wha ;
Journal of the Korean Society for Railway, volume 14, issue 2, 2011, Pages 160~166
DOI : 10.7782/JKSR.2011.14.2.160
It is difficult to clarify the dynamic response characteristics of trackbed because of various environmental conditions. However, track irregularity be affected by ununiformed bearing capacity and its dynamic response, study for dynamic response characteristics is required to investigate the cause of track irregularity and countermeasure. In this paper, the response variation for dominant frequency and vibration energy by trackbed structure and material stiffness are investigated. The analysis section is two layered ground structure that is comprised of trackbed and soft rock. This structure amplifies the energy of dominant range easily. It is evaluated to affect track irregularity on comparing by theoritical, analytical and empirical method for dynamic response of the trackbed.
A Study on Revising Train Departure Time for Reducing Electric Power Consumption
Kim, Kwang-Tae ; Kim, Kyung-Min ; Hong, Soon-Heum ;
Journal of the Korean Society for Railway, volume 14, issue 2, 2011, Pages 167~173
DOI : 10.7782/JKSR.2011.14.2.167
This paper considers the problem of revising train departure time to reduce electric power consumption of mass rapid transit (MRT) railways. The motion of a train running between stations is divided into three phases: traction, coasting, and deceleration phases. The traction phase requires high electric power to operate MRT railways. In the coasting phase, the train moves stably by consuming little or no power. The deceleration phase is a braking mode and produces some electric power called regenerated brake power owing to inertia force for the train generated In the traction and coasting phases. The regenerative energy can be used by other accelerating trains within a specific range from the train and thereby the power consumptions of train can be reduced. We developed a mixed integer programming model to solve the problem. To validate the suggested model, a computational experiment was conducted using real data from Korea Metropolitan Subway.
A Comparative Study of Rail Heritage Conservation System between Korea and Japan
Lee, Yong-Sang ; Chung, Byung-Hyun ;
Journal of the Korean Society for Railway, volume 14, issue 2, 2011, Pages 174~180
DOI : 10.7782/JKSR.2011.14.2.174
This study have been reviewed Korea`s railway system and railway cultural heritage status and suggested several solutions as a recognition of the importance of cultural property and development of the railway train had developed. Through the analysis of Japan`s excellent conditions of a conservation and management of cultural heritage railway system, we would like to offer a direction of Korea`s future heritage railway system. There were many changes during the time of a government owned railroad and the time after privatization in Japan by starting from administrating a systematic cultural railway at an institution that directly operates and constructs the railway train, which would be the point Korea need to approach considerately. Therefore, in this study, we would like to compare and analyse cultural heritage railway system between Japan and Korea and propose advanced solution for Korea`s preservation of the Railway Heritage in the future.
Policy Measures for Amending the Modal Shift Grant Scheme in Korea
Kim, Hyun ; Mun, Jin-Su ;
Journal of the Korean Society for Railway, volume 14, issue 2, 2011, Pages 181~187
DOI : 10.7782/JKSR.2011.14.2.181
Korean government has introduced the modal shift grant scheme in July 2010 to help the competitiveness of carriage of rail freight and awarded a grant to private companies shifting mode of transportation from road to rail in the carriage of freight: the additional costs incurred in the modal shift are supported by the government. However, there arise needs for the amendment of the modal shift grant scheme. This study reviewed the modal shift grant schemes of foreign countries, such as EU, UK and Japan, and drew implications. Furthermore, this study suggested the future directions of the modal shift grant scheme from the respects of the maximization of the effects of the grant scheme, continual rail use of existing rail freight, and justification of the grant scheme. Finally, policy measures amending the existing modal shift grant scheme were suggested.
PRT Application Study Using Corridor Analysis; Focused on Nan-Gok Area
Lee, Jin-Sun ; Kim, Kyoung-Tae ;
Journal of the Korean Society for Railway, volume 14, issue 2, 2011, Pages 188~193
DOI : 10.7782/JKSR.2011.14.2.188
In order to solve urban transportation problems, the various alternatives are presented to the public transportation system but the master plan of construction and operation is that there is no validity. PRT unlike other public transport system, is a new transport system that can respond appropriately, to solve the traffic demand, environmental and energy problems. Meanwhile, national and international PRT system was not commercially and the actual construction and operation of the PRT in case of base research is not well established. In this paper, PRT concept was established as the new transportation system, the target area(Nan-gok area) was selected to examine the feasibility of PRT systems and the corridor analysis method has been developed to predict the PRT demand as a basic material of planning process.
A Conceptual Investment Cost Estimation Using by Cost Indices for the Train Control Facility of High-speed Rail Project
Lee, Young-Joo ; Lee, Yong-Eok ; Jang, Seong-Yong ;
Journal of the Korean Society for Railway, volume 14, issue 2, 2011, Pages 194~202
DOI : 10.7782/JKSR.2011.14.2.194
Most of Orders of Magnitude estimate are based on historical data. This data is converted to the current price using by the cost index method mainly. This method, however, is rarely utilized or only for one-time use due to the lack of data and the complex escalation calculation method. This paper present a typical process on the conceptual investment cost estimation using by Cost Indexes based on the actual case for the Train Control facility of High-speed rail project. The result is expected to serve as both an easy way for Order of Magnitude estimate and a standard guideline for computerized modeling.