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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 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
Development of Air Cleaning Roll-Filter for Improving IAQ in Subway
Kwon, Soon-Bark ; Park, Duck-Shin ; Cho, Young-Min ; Kim, Jong-Bum ; NanGoong, Seok ; Han, Tae-Woo ; Cho, Kwan-Hyun ; Kim, Tae-Sung ;
Journal of the Korean Society for Railway, volume 14, issue 4, 2011, Pages 313~319
DOI : 10.7782/JKSR.2011.14.4.313
In a modern society, various type of transportation modes are utilized, among them the subway system is the one of the main transportation mode which more than 7.21 million people ride a day in Seoul. Due to the increased interests on the indoor air quality (IAQ) of underground facilities, public concerns on IAQ of subway system are increasing also. Platform screen door (PSD) recently installed at the whole stations of Seoul subway and tunnel washing-out appeared to be effective in reducing particulate matters in the platform and tunnel. However there has not been any attempt to improve IAQ of subway cabin inside. Most technologies for removing airborne particulate matters are known to be difficult to adopt on the subway cabin due to the problem of maintenance cost. Therefore, the object of this study is a practical development of cabin air cleaning system which can reduce the concentration of airborne particles and harmful gases at the same time. In this paper, we focused on the development of particle removing system utilizing a roll-filter for increasing operating time of air filter. The prototype of system was designed and manufactured based on the numerical prediction results. For rollfilter device, 5 candidate filter materials were tested in point of particle collection efficiency and pressure drop. It was found that the electrically charged filter material showed the highest performance among them.
Structural Damage Detection by Using the Time-Reversal Process of Lamb Waves and the Imaging Method
Jun, Yong-Ju ; Lee, U-Sik ;
Journal of the Korean Society for Railway, volume 14, issue 4, 2011, Pages 320~326
DOI : 10.7782/JKSR.2011.14.4.320
This paper proposes a baseline-free SHM technique in which the time-reversal process of Lamb waves and the imaging method are used. The proposed SHM technique has three distinct features when compared with the authors` previously proposed one: (1) It use the reconstructed signal for damage diagnosis, without need to extract the damage signal as the difference between reconstructed signal and initial input signal; (2) It use the imaging method based on the time-offlight information from the reconstructed signal, instead of using a pattern comparison method; (3) In order to make the damage image more clear, the modified mathematical definition of damage image in a pixel is used. The proposed SHM technique is evaluated through the damage detection experiment for an aluminum plate with damage at different locations.
Two Dimensional Numerical Study in Gangway of Next Generation High Speed Train For Reduction of Aero-acoustic Noise
Kang, Hyung-Min ; Kim, Cheol-Wan ; Cho, Tae-Hwan ; Jeon, Wan-Ho ; Yun, Su-Hwan ; Kwon, Hyeok-Bin ; Park, Chun-Su ;
Journal of the Korean Society for Railway, volume 14, issue 4, 2011, Pages 327~332
DOI : 10.7782/JKSR.2011.14.4.327
As the preceding research for the design of gangway in the next generation high speed train, the aero-acoustic noise at the gangway is calculated. For this purpose, the shape of gangway with mud flaps is assumed as the two-dimensional cavity. Then, 5 gap sizes between mud flaps of gangway are selected and parametric study is performed according to the gap sizes. From this study, the aerodynamic features such as vortex shedding, pressure, etc. are computed. Also, the aero-acoustic properties of tonal noise and overall noise are analyzed at the 3 locations of microphone and the relation between the gap size of mud flap and the noise level is assessed. Through this study, it is shown that the noise characteristics of base and specific models are better than those of other models.
Development of FE Models of the Heavy Obstacle for the EU-TSI and Domestic Rolling Stock Safety Regulations and Application to Collision Evaluation of the Korean High-speed EMU
Kim, Geo-Young ; Koo, Jeong-Seo ;
Journal of the Korean Society for Railway, volume 14, issue 4, 2011, Pages 333~340
DOI : 10.7782/JKSR.2011.14.4.333
The purpose of this paper is to develop two kinds of finite element models for the heavy deformable obstacle defined in grade crossing collision scenario of the Europe TSI and the Korean rolling stock safety regulations and to apply the crashworthiness evaluation for the Korean high-speed EMU with the FE model. The numerical models of the heavy obstacle were changed from a past rigid one to a current deformable one whose stiffness requirement should be verified by a collision simulation defined in the regulations. Through several trial simulations, two types of numerical models for the heavy obstacle were developed, which satisfied physical properties specifies in the regulations. One is a solid-type obstacle with uniform density and the other is a shell-type. With the obstacles developed in this study, the grade crossing collision scenario for Korean high-speed EMU was simulated and evaluated for the two-type obstacle models. From the simulation results, the shell and solid-type obstacles showed quite different behaviors after collision, and the shell type model gave more severe results.
Development of Lavatory Emergency Detection System using Sensors in Train
Song, Dahl-Ho ; Chang, Duk-Jin ; Kang, Song-Hee ;
Journal of the Korean Society for Railway, volume 14, issue 4, 2011, Pages 341~347
DOI : 10.7782/JKSR.2011.14.4.341
In this paper, studied was the application of IT and sensor technology to trains in order to provide safety and convenience for passengers. One of applications is Lavatory Emergency Detection System in a train. Since a lavatory in a train is securely separated space, it is hard to notice an emergency inside of it unless a user sends a request for help. A system that can detect an emergency by using sensors was presented. System requirements were analyzed to design and implement a system. Prototype of the system was made. Then, tests in a laboratory were carried out based on a set of test plan to verify the system functions. Performance was turned out to be very successful. The system developed may have a chance to be installed according to the requirements of specifications of the train to be ordered.
Analysis of Iron-filings Trapping Characteristics on Concrete Slab Track using Permanent Magnet
Park, Chan-Bae ; Lee, Ju ;
Journal of the Korean Society for Railway, volume 14, issue 4, 2011, Pages 348~353
DOI : 10.7782/JKSR.2011.14.4.348
Iron fillings which were accumulated around the rail was often the cause of abnormal signal in case of signaling equipment using rail as transmission line. Iron fillings were generated on curved section of railroad due to the friction between rail and wheel, and metro line company urged to find the way to remove these iron fillings, because these were often the cause of abnormal signal. Magnetic device for trapping iron fillings around concrete slab tracks is introduced. The characteristics of magnetic device were analyzed using basic design and numerical analysis method. Magnetic device for trapping iron fillings were examined for application to the train which were operating in commercial line.
Systemization Setting of Various Improvement Plans in Railway Bridges
Baek, Jae-Wook ; Park, Tae-Hyo ;
Journal of the Korean Society for Railway, volume 14, issue 4, 2011, Pages 354~363
DOI : 10.7782/JKSR.2011.14.4.354
Existing railway bridges have been going through various improvements since the past, with new improvement plans being formed based on social and technological demands. However, there is the need, above all, for an efficient execution plan due to the great number of sites and excessive amount of required expenses contrary to limited assets. The system itself must be held in question in order to systemize various improvement plans, to define and describe factors while utilizing evaluation methods for significance and correlation to achieve generalization. This paper is focused on determining the priority of various improvement plans through the optimization selection process of mutually evaluating alternative plans under various evaluation standards, thus corresponding to the decision-making purpose. The AHP analysis technique was applied for systemization setting and preference evaluation, while the HPT procedure was applied to develop and select appropriate improvement plan factors.
Development of FBG Accelerometer for Railway Tunnel Vibration
Lee, Su-Hyung ; Shin, Min-Ho ; Kim, Hyun-Ki ; Lee, Kyu-Wan ;
Journal of the Korean Society for Railway, volume 14, issue 4, 2011, Pages 364~369
DOI : 10.7782/JKSR.2011.14.4.364
For the safety management of tunnel, effective measurements should be continuously carried out. Most of sensors currently being applied for tunnels measure only the local status, thus many of them are needed to monitor an entire tunnel. For the railway tunnel where trains of same conditions are regularly operated, dynamic responses of tunnel structure to train operations can be a good index to estimate the deformation of tunnel structure in wide area. Meanwhile, the electromagnetic interference caused by overhead centenary in railway tunnel obstructs the use of electric-based sensors. In this study a brand new accelerometer using FBG optical fiber sensors is developed to solve these problems. Sensitivity and capacity of the accelerometer are enhanced with effective structural design of its components and verified with laboratory tests. A case history where the developed accelerometers were applied to a safety monitoring system of a high-speed train tunnel is presented. The performances of the developed accelerometers are validated from the measured acceleration data.
PRT Benefit Estimation Study; Focused on Nan-Gok line
Lee, Jin-Sun ;
Journal of the Korean Society for Railway, volume 14, issue 4, 2011, Pages 370~375
DOI : 10.7782/JKSR.2011.14.4.370
In this paper, as a follow-up PRT studies of "J. Lee & K. Kim", in terms of public transportation systems, economic feasibility of PRT systems was investigated. Based on previous studies, PRT demand was estimated and the required number of PRT vehicles has been calculated and the benefit was estimated. To ensure the economic feasibility, construction cost of a PRT system should be the level of 8 billion won per km, and the annual operating costs of the PRT system construction should be approximately 4.63% level. As a result, how much to reduce PRT construction costs, depending on whether decisions are considered to be economically feasible. Thus, PRT technology development will be conducted by targeting the most lightweight and by minimizing the infrastructure and vehicles of PRT.
A Study on the Effects of Railway Logistics Information System Quality on the shipper`s Satisfaction
Yang, Jae-Hoon ;
Journal of the Korean Society for Railway, volume 14, issue 4, 2011, Pages 376~382
DOI : 10.7782/JKSR.2011.14.4.376
The service quality of website has been recognized as an important factor for business productivity and affected the customer behavior. The logistics industry is no longer exceptional for these trends. This study attempts to find out relationship between the quality of railway logistics information service (reliability, availability, appearance, convenience) and the satisfaction of shipper. In the result of regression analysis, reliability and availability have effects to shipper`s satisfaction. But appearance and convenience have no effects to shipper`s satisfaction. The purpose of this paper is to suggest the strategy of railway logistics information service to increase the shipper`s satisfaction.
Development of Mode Choice Model and Applications Considering Connectivity of Express Way
Cho, Hang-Ung ; Chung, Sung-Bong ; Kim, Si-Gon ; Oh, Jae-Hak ;
Journal of the Korean Society for Railway, volume 14, issue 4, 2011, Pages 383~389
DOI : 10.7782/JKSR.2011.14.4.383
Until now, in planning and constructing KTX and the Express Way, the connectivity and transfer between these facilities have not been considered. In this study the effect of mode choice behavior by connecting KTX and the Express Way is analyzed through estimating Multinomial Logit Model and Binary Logit Model. The SP and RP surveys to develop these models were carried out and the data were selected from the passengers using the KTX station, Express Bus Terminals and Rest Areas in the Express Way. To test the effect of connectivity and transfer in the field, the case study for Dongtan KTX station was carried out. According to the results, connecting the KTX station and the Express Way has the effect of increasing the demand by 30%. And this is caused by saving about 120 minutes of traveling time from Seoul to Pusan. This study shows that the connectivity and transfer can increase the efficiency of transportation system and the improvement in the mobility and accessibility will maximize the usages of these two facilities.