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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 10, Issue 6 - Dec 2007
Volume 10, Issue 5 - Oct 2007
Volume 10, Issue 4 - Aug 2007
Volume 10, Issue 3 - Jun 2007
Volume 10, Issue 2 - Apr 2007
Volume 10, Issue 1 - Feb 2007
Selecting the target year
Development and Case Study of 4D CAD System for Visualizing Schedule Data of Construction Project
Kang, Leen-Seok ; Yun, Seon-Mi ; Kwon, Jung-Hui ; Mun, Jin-Seok ;
Journal of the Korean society for railway, volume 10, issue 4, 2007, Pages 373~380
Recently, various 4D CAD systems for visualizing construction schedule data are being developed. Specially, in case of railway project, the numerical information of progress data should be changed with visualized data by long construction section because the railway project consists of long length in construction site. This study suggests a case study of development of 4D CAD system for visualizing schedule information and the major functions of developed system are verified by railway project. The detailed application procedure of 4D CAD system including input data for a railway project is described in the study. The practical application of 4D CAD system can be improved in railway project by these demonstration researches.
A Study on Crashworthy Characteristics of EMU Carbody for Overhead Line Structure Types
Kim, Jin-Seok ; Lee, Hyun-Cheol ; Cho, Hyun-Jik ; Koo, Jeong-Seo ;
Journal of the Korean society for railway, volume 10, issue 4, 2007, Pages 381~387
In this paper, crashworthiness of the EMU carbody of Incheon Metro is numerically evaluated against two types of overhead line structures (headspan and portal-type). The material of the EMU carbody is stainless steel (SUS301L), and that of the overhead line structures is the structural steel (SS400). The EMU carbody is analyzed under collision conditions, such as upright side-on impact, side-on roof impact and angled roof impact scenarios, to be collided against the headspan type or the portal type at the speed of 64.4km/h, respectively. It is concluded from the numerical results that the overhead line structures will not do so much harm to the EMU carbody of Incheon Metro for various collisions caused by derailment. Furthermore, the overhead line structure of the portal type is superior to that of the headspan type in the crashworthy point of view.
Insulation Performance Estimation of Main Relays by Partial Discharges
Kil, Gyung-Suk ; Kim, Il-Kwon ; Park, Dae-Won ; Song, Jae-Yong ; Lee, Gang-Won ; Cho, Eun-Je ;
Journal of the Korean society for railway, volume 10, issue 4, 2007, Pages 388~392
A new dielectric test on main relays of electric traction vehicles, the partial discharge(PD) test, is proposed. The PD test will not affect the insulation performance of specimen during the test and provide much more detailed information on insulation, the types of defects, and so on. Insulation performance of relays is estimated by discharge inception voltage(DIV), discharge extinction voltage (DEV), and apparent charge as a function of test voltage and time. Three main relays of different manufacturing date were estimated by applying AC voltage with three patterns in ranges of
. From the results, we could estimate insulation state and which types of defects exist in them.
A Study on Creating the SEMP with Project Management Data for the Railway System Development
Kim, Ung ; Yoon, Jae-Han ; Lee, Jae-Chon ; Cho, Yun-Ok ; Kim, Sang-Ahm ; Yoon, Hyuk-Jin ;
Journal of the Korean society for railway, volume 10, issue 4, 2007, Pages 393~397
During the complex systems development, a great deal of data are generated from both the systems engineering process and project management process, and also some data are required to be prepared for the system engineering management plan (SEMP). For the successful completion of the project, it is necessary to effectively manage all the data in order to maintain data consistency and traceability. To fulfill the necessity, this paper introduces the concept of an integrated data architecture and discusses its realization with
(a computer aided systems engineering tool). Also, it was described how to automate the production of the SEMP in that working environment. The result of the approach, managing complex data efficiently in the systems engineering view, has been successfully applied in the Railway Safety Development Program.
Cognitive Process of Railway Drivers at Different Speeds
Kim, Sa-Kil ; Park, Hong-Joon ; Kyung, Tae-Won ; Byun, Seong-Nam ;
Journal of the Korean society for railway, volume 10, issue 4, 2007, Pages 398~404
The objective of this study is to verify the hypothesis that cognitive process of railway drivers would be influenced by train speed. The hypothesis is tested by investigating railway drivers' cognitive processes at different speeds of a locomotion. The experiment shows that human performance of railway drivers decreases as the train speed becomes faster. In addition, simple signals outperformed complex signals at every train speed. Therefore, it is suggested to redesign complex signals simpler for improving drivers' human performance. It is also recommended that the Korean railway safety law should be revised to mention requirement of the signal design, especially for the fastest train including KTX. The implications of the experiments are discussed in detail.
Prediction of Interior Noise for Tilting Train by using Transmission Loss
Kim, Jae-Chul ;
Journal of the Korean society for railway, volume 10, issue 4, 2007, Pages 405~408
In this paper, we describe the analysis of interior noise for tilting train that is being developed in Korea. Tilting train is made of composite material to reduce the car body's weight and attached a self-steering system on bogie to improve curving performance. However, the acoustic performance (Transmission Loss) of such material is worse than the materials of conventional train, such as aluminum, steel and so on. Therefore, we measure the transmission loss of side wall/floor of tiling train and predict the interior noise for tilting train using its measuring results.
Development of a Dynamically Scaled Model of the Catenary for High Speed Railway
Kim, Jung-Soo ;
Journal of the Korean society for railway, volume 10, issue 4, 2007, Pages 409~413
A dynamically scaled model of the catenary with a nominal scaling factor of 18.5:1 is designed and constructed. The motivation for developing such a model is the great difficulty of making accurate measurements on the full-scale catenary and the difficulty of making experimental modifications to it. The scaled model is designed to be dynamically equivalent to the full scale catenary with respect to the mass and elastic strength. The scaled model is partially verified by comparing linear vibration and wave characteristics with those predicted by the simulation study.
A Verification of the Contact Dynamics of the Current Collection System on a Test Run
Kim, Jung-Soo ;
Journal of the Korean society for railway, volume 10, issue 4, 2007, Pages 414~419
The contact characteristics of the current collection system are investigated by analyzing data collected during a test run of the Korean high speed rail vehicle. For the analysis, the signals from accelerometers and load cells attached to the various parts of the pantograph are analyzed in both the time and frequency domains. In the frequency domain, the pantograph response consists of low frequency components related to the rigid-body motion of the panhead assembly and high frequency components due to the structural vibration modes of the pantograph. The analysis shows that the inclusion of the high frequency structural vibration modes of the pantograph in the contact force calculation has a negligible effect on the predicted mean value of the contact force but significantly affects the magnitude of its fluctuations. This finding implies that numerical simulations using lumped element models of the pantograph may accurately predict the mean contact force but is limited in its capacity for predicting the fluctuation about the mean. Since the ratio of the fluctuation to the mean in the contact force increases with increased train speed, the limitation of the predictions based on numerical simulation results becomes more pronounced at higher train speed.
The Analysis of Service Characteristics for Subway Passengers Using The Importance-Performance Analysis(IPA)
Park, Jung-Soo ; Yoon, Sang-Hoon ; Bae, Gi-Mok ; Kim, Tae-Ho ;
Journal of the Korean society for railway, volume 10, issue 4, 2007, Pages 420~430
It is reported that many users of the subways in Seoul are not currently satisfied with the subway services. The cause of the dissatisfaction is that the qualitative items and indexes are not considered properly, and also does not diversify the evaluation items to follow the change of subway environment. Therefore in this study the evaluation items and indexes that can reflect of the subway users' characteristics are examined and synthesized. Then the characteristics of service are analyzed for the senior subway system users and junior subway system users that are classified with the cluster analysis. The result of the study is that the majority of users on subway are not satisfied the qualitative items which are safety, kindness, comfortableness, convenience excepting for punctuality and accessibility. So, if the service of subway users improve, the qualitative items is needed to consider with quantitative items.
Dynamic Modeling of a Railway Vehicle under Braking
Park, Joon-Hyuk ; Goo, Byeong-Choon ;
Journal of the Korean society for railway, volume 10, issue 4, 2007, Pages 431~437
This paper describes the dynamic modeling of a railway vehicle when it is under braking force. It is important for the enhancement of braking performance to establish a proper dynamic model of a railway vehicle because the braking performance is affected by some dynamic forces generated by a railway vehicle when it undergoes braking. In this paper, a dynamic model for one vehicle is suggested to compute the dynamic behavior of a railway vehicle in the HILS(Hardware In-the-loop Simulation) system for the railway vehicle braking devices. To simplify the dynamic model, friction between a wheel and a rail is assumed that there exist only the static and the dynamic friction forces. Static friction coefficient is also assumed to be a function of the running speed. Some simulations are carried out with various braking forces, and the braking characteristics according to the change of the braking force are discussed. This study can provide some fundamental results to construct the HILS system for braking devices of a railway vehicle.
A Study on Integrated SE Process for the Development of the Railway Systems with Safety Assessment Included
Yoon, Jae-Han ; Lee, Jae-Chon ; Hong, Seon-Ho ;
Journal of the Korean society for railway, volume 10, issue 4, 2007, Pages 438~443
This paper proposes an integrated SE process for the development of railway systems with safety assessment included. Although the safety assessment process must be performed with SE process properly with good coordination, the interfaces between the two processes have not been clear. Thus, in many of safety critical system developments in Korea, it is difficult to assess safety in proper development phase. The process model proposed in this paper is based on both the concept of system life cycle and the repetitive use of SE process. In each of development phases, appropriate safety assessment methods are described. Also the evaluation of the integrated system incorporating safety factors is described. The resultant process model is expressed by the Enhanced Functional Flow Block Diagram (EFFBD) using a CASE tool. The model also allows timeline analysis for identifying activity flow and data flow, resulting in the effective management of process. In conclusion, the integrated process enable both the SE process and safety assessment process to cooperate with each other from early development phase throughout the whole system life cycle.
A Study on the Dynamic Characteristics of the Bi-modal Tram with All-Wheel-Steering System
Lee, Soo-Ho ; Moon, Kyung-Ho ; Jeon, Young-Ho ; Lee, Jung-Shik ; Kim, Duk-Gie ; Park, Tae-Won ;
Journal of the Korean society for railway, volume 10, issue 4, 2007, Pages 444~450
The bi-modal tram guided by the magnetic guidance system has two car-bodies and three axles. Each axle of the vehicle has an independent suspension to lower the floor of the car and improve ride quality. The turning radius of the vehicle may increase as a consequence of the long wheel base. Therefore, the vehicle is equipped with the All-Wheel-Steering(AWS) system for safe driving on a curved road. Front and rear axles should be steered in opposite directions, which means a negative mode, to minimize the turning radius. On the other hand, they also should be steered in the same direction, which means a positive mode, for the stopping mode. Moreover, only the front axle is steered for stability of the vehicle upon high-speed driving. In summary, steering angles and directions of the each axle should be changed according to the driving environment and steering mode. This paper proposes an appropriate AWS control algorithm for stable driving of the bi-modal tram. Furthermore, a multi-body model of the vehicle is simulated to verify the suitability of the algorithm. This model can also analyze the different dynamic characteristics between 2WS and AWS.
The Effect of Outsourcing of Metro on Organizational Performance: Focused on the Role of Balanced Scorecard for Employees Perception
Choi, Yun-Geun ; Park, Ki-Chan ;
Journal of the Korean society for railway, volume 10, issue 4, 2007, Pages 451~456
Organizational abilities which assure human resource of excellent quality in enterprise and organization, manages human resource effectively and systematically will be depended on the performance and successful or not of enterprise. The organization which readies to accept changes will survive, the organization makes full use of changes to opportunity and strategy will be a winner. Now when the environment of enterprise is uncertain and environment of management changes, organization should manage HRM in strategic point of view to maintain persistent competition superiority. We investigated how outsourcing affected on organizational performance perception according to inducting BSC from the employees of metro. As a result of the investigation, outsourcing is perceived importantly in study, growth, internal process point of view, but didn't perceived in finance and customer. We guessed that outsourcing would be perceived importantly in financial point of view as a cost reduction. In 5 years from the beginning of metro, it seemed to be perceived importantly, as organizations grow older, perceptions of outsourcing are perceived low because of stabilization of organization and labor's resistance. It is why that the more outsourcing is performed, the more reduction of organization and decrease of employees is expected as much as cost reduction.