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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 11, Issue 6 - Dec 2008
Volume 11, Issue 5 - Oct 2008
Volume 11, Issue 4 - Aug 2008
Volume 11, Issue 3 - Jun 2008
Volume 11, Issue 2 - Apr 2008
Volume 11, Issue 1 - Feb 2008
Selecting the target year
A Study on the Reduction of Structure-borne Noise in a Train
Woo, Kwan-Je ; Kim, Seock-Hyun ;
Journal of the Korean Society for Railway, volume 11, issue 6, 2008, Pages 519~523
Inside noise levels of running train is the summation of air borne noise and structure-borne noise. In this paper, structure-borne noise, which is known to dominate inside noise level in open field, is investigated. Structure borne noise is analyzed in terms of vibration sources, transmission path and noise generating part so as to reduce inside noise levels.
Characteristics of Wheel Tread for Urban Train Based on Contact Positions
Kwon, Seok-Jin ; Noh, Hang-Nak ; Nam, Yoon-Su ; Seo, Jung-Won ; Lee, Dong-Hyung ;
Journal of the Korean Society for Railway, volume 11, issue 6, 2008, Pages 524~529
The damaged wheel in railway vehicle would cause a poor ride comfort, a rise in the maintenance cost and even fracture of the wheel, which then leads to a tremendous social and economical cost. The defect initiation and crack propagation in wheel may result in the damage of the railway vehicle or derailment. Therefore, it is important to evaluate the characteristics of the wheel tread. In the present paper, the characteristics of wheel tread based on contact positions, running distance and brake pattern are evaluated. The result shows that the damaged wheel tread is remarkably depended on the contact positions between wheel and rail.
Construction of Event Tree & Fault Tree for Train Fire Risk Assessment
Kwak, Sang-Log ; Wang, Jong-Bae ; Lee, Bong-Seob ; Park, Chan-Woo ;
Journal of the Korean Society for Railway, volume 11, issue 6, 2008, Pages 530~535
After train fire accident in Daegue, many research on train fire safety improvement have been carrying out. Since many alternative fire safety measures can be applied in our railway system, the effect of the each safety measure must be quantified prior to the safety investment. In order to estimate the effects of each safety measure quantitatively, fault trees and event trees are constructed in this study. Results can be applied for cost-benefit analysis or sensitivity analysis for safety measures in risk assessment process.
The Influence of Frequency on Wayside Transmitter of ATP System upon Reinforcing Bars in Concrete Slab Track
Kim, Min-Seok ; Yoon, In-Mo ; Ko, Jun-Seog ; Lee, Jong-Woo ;
Journal of the Korean Society for Railway, volume 11, issue 6, 2008, Pages 536~542
In concrete slab track, the signal current using wayside transmitter of ATP (Automatic Train Protection) system is influenced by reinforcing bars. The magnetic coupling between reinforcing bars and wayside transmitter of ATP system as a filter makes an input current distorted. So, it makes an alternating current signal with a desirable size not transmit to on-board system of a train. Way to decrease the distortion of an input current signal frequency is to avoid maximum induction current frequency. And the induction phenomenon between reinforcing bars insulated and wayside transmitter of ATP system does not occur. In this paper, we represent the model about wayside transmitter of ATP system and reinforcing bars on the concrete slab tracks, and calculated the parameters demanded for the model. Also, we demonstrated it through the Maxwell program. Furthermore, we calculated impedance on wayside transmitter used in KVB system and ERTMS/ETCS system which are a kind of ATP system, frequency response of induction current, using Matlab, and demonstrated the validity of it, using PSpice program.
Discussion for Ride Evaluation of High Speed Train by Using Inferential Statistics
Hwang, Hee-Soo ; Kim, Seog-Won ; Park, Chan-Kyeong ; Mok, Jin-Yong ; Kim, Ki-Hwan ; Kim, Young-Guk ;
Journal of the Korean Society for Railway, volume 11, issue 6, 2008, Pages 543~549
The ride comfort is more important according to train speedup. Generally it is defined as the vehicle vibration. There are many studies on evaluation method of ride comfort for railway. But the ride comfort for Korean high speed train (HSR 350x) has been assessed by statistical method according to UIC 5l3R. In this paper, the ride indices, which were measured in the Korean high speed train. have been analyzed and reviewed by using the inferential statistics such as t-test, variance analysis (ANOVA) and regression analysis.
A Deterministic Transit Assignment Model for Intercity Rail Network
Kim, Kyoung-Tae ; Rhee, Sung-Mo ; Kwon, Yong-Seok ;
Journal of the Korean Society for Railway, volume 11, issue 6, 2008, Pages 550~561
The purpose of this paper is to propose a new transit assignment model for intercity rail networks. The characteristics of intercity rail are different from that of public transit in urban area. Line selection probability on route section is introduced to include the characteristics of intercity rail into transit assignment model. Network expansion is more simplified by a assumption line selection probability is externally given. The generalized cost is used to decide the volume of each transit line in most of existing transit assignment models. But, many variables have influence on the volume of each line such as time schedule of transit lines, inter-station distance, passengers' income, seasonal variation of demand and regional characteristics. The influence of these variables can be considered to decide the volume of each line by introducing line selection probability on route section. The tests on a small scale network show that the model proposed in this paper is superior to existing models for predicting intercity rail demand. Proposed model is suitable to consider the complicated fare structure of intercity rail and to draw inter-station demand directly as a result of assignment procedure.
A New Evaluation Method for the Effectiveness of Standardized Packing Module
Choi, Chang-Ho ; Kim, Gwang-Ho ; Park, Dong-Joo ;
Journal of the Korean Society for Railway, volume 11, issue 6, 2008, Pages 562~568
The modern logistics has tried not only to convert the conventional packing system into unit load system using pallet but also to enhance the fitness between packing facilities and transport modes. This is based on the goal to reduce total logistics cost by improving logistics efficiency. Since the packing unit can affect both loading rate and loading facilities, basic form of packing unit is very important to unit load system. The object of this study is to develop a new method for evaluating the effectiveness of standardized packing module. The new method is based on measure of effectiveness (MOE) which are identified by expert survey. This study has originality in that the collecting method for effectiveness of standardized packing module has not been developed up to now.
Development of Catenary Stagger and Height Measurement System using Laser
Song, Sung-Gun ; Lee, Teak-Hee ; Song, Jae-Yeol ; Park, Seong-Mo ;
Journal of the Korean Society for Railway, volume 11, issue 6, 2008, Pages 569~574
Catenary and Pantograph are used to transmit electrical energy to electric railways. Catenary (Overhead Contact Lines) should be installed precisely and managed for stable train operations. But external factors such as weather, temperature, etc., or aging affect catenary geometry. Changed catenary stagger and height cause high voltage spark or instant electric contact loss. Big spark derived from contact loss can damage the pantograph carbon strip and overhead contact lines that might interrupt the train operations. Therefore, to prevent a big scale spark or electric contact loss, catenary maintenance are required catenary geometry measurement systems with catenary maintenance capability. In this paper, we describe the development of catenary height and stagger measurement system. The catenary height and stagger measurement system uses Acuity company's AR4000 Laser Range Finder for distance measurement and AccuRange Line Scanner for degree measurement. This system detects suspicious overhead line sections with excessive stagger and height stagger variance.
Experimental Study to Measure the Characteristics of KTX Train Wind Pressure by using Field Test
Nam, Seong-Won ; Kwon, Hyeok-Bin ; Nam, Yoon-Su ;
Journal of the Korean Society for Railway, volume 11, issue 6, 2008, Pages 575~580
When constructing a high-speed railroad, the reduction of the distance between track centers and the width of track bed will save the construction cost. However the shortening the distance between track centers may cause the stability problems due to higher wind pressure. Therefore the extensive technical review and aerodynamical study should be performed to determine the adequate distance between track centers. In this study, the impact that the increase in wind pressure due to the change of aerodynamic phenomena with the change of the distance between track centers may have on two trains passing by each other was predicted, and the stability of train operation was analyzed in order to review the distance between track centers suitable to Honam HSR trains. And we estimated the aerodynamical effects by the results of the field test.
A Railway Network Design Problem Considering Passengers Route Choice
Lim, Yong-Tae k ; Jang, Jun-Seok ; Park, Jin-Kyung ; Lee, Jun ;
Journal of the Korean Society for Railway, volume 11, issue 6, 2008, Pages 581~587
This paper presents a railway network design problem (RNDP), which can be formulated as a bi-level program. In bi-level program upper level program is to minimize total travel cost including the construction cost of the railway facilities, whilst lower one describes the railway route choice behavior of passengers. We also propose a heuristic method for solving the program because it is a kind of NP-hard problem. From two numerical railway examples, we confirm that the RNDP and its algorithm produce a reasonable solution and that it is applicable to real world.
Mode Choice Characteristics of Rail Freight Transportation
Choi, Chang-Ho ; Shin, Seung-Jin ; Park, Dong-Joo ; Kim, Han-Soo ; Jin, Jang-Won ;
Journal of the Korean Society for Railway, volume 11, issue 6, 2008, Pages 588~595
This study is carried out for understanding mode choice behavior of shippers and introducing ideal mode share between rail and truck in Korea. The model type is individual behavioral model and the input data type is stated preference (SP) data. SP data was prepared by design of experiments. The explanatory variables in models are transport time, transport cost and service level. The research result shows that it is more effective to reduce transport cost rather than to implement other strategies. For container, reducing transport cost and transport time and increasing service level simultaneously can strengthen the competitiveness of rail over truck transportation. On the other hand, for bulk freight such as cement and steel, it is better to reduce the transport cost than to do other attributes.