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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
Editor in Chief :
Volume & Issues
Volume 9, Issue 6 - Dec 2006
Volume 9, Issue 5 - Oct 2006
Volume 9, Issue 4 - Aug 2006
Volume 9, Issue 3 - Jun 2006
Volume 9, Issue 2 - Apr 2006
Volume 9, Issue 1 - Feb 2006
Selecting the target year
Application of Disaster Information Classification System for Disaster Management
Kang Leen-Seok ; Park Seo-Young ; Moon Hyoun-Seok ;
Journal of the Korean society for railway, volume 9, issue 4, 2006, Pages 335~342
Disaster management system should be built for minimizing damage factor that affects to construction facility from natural disaster. It could be classified by three categories such as disaster prevention, damage survey and recovery phases. For an integrated disaster management system, a disaster information classification system(DICS) is necessary for the reasonable disaster information management. This study suggests an integrated DICS that includes disaster type classification, facility type classification and information type classification for disaster management service. The applicability of suggested DICS is verified by railway facility and the research result could be used as a basic information system for national disaster management system.
Feasibility Study through Simulation of LSM Propulsion System for the Catenary-current Collection Run Tester
Kwon Sam-Young ; Lee Hyung-Woo ; Prak Hyun-June ; Lee Ju ;
Journal of the Korean society for railway, volume 9, issue 4, 2006, Pages 343~348
In this paper, as a conceptual design of the catenary-current collection run tester which is planning to be constructed by KRRI, the feasibility study is described. In this study, reviews to determine the propulsion linear motor rating based on the target distance-speed curve through various simulation of LSM propulsion system were conducted. Moreover, the reviews of simulation results and desirable linear motor specifications are discussed in this paper.
Performance Evaluation of Repair Methods for RC structures by Accelerating Test in Combined Deterioration Chamber and Long-Term Field Exposure Test
Kwon Young-Jin ; Kim Jae-Hwan ; Han Byung-Chan ; Jang Seung-Yup ;
Journal of the Korean society for railway, volume 9, issue 4, 2006, Pages 349~356
At present, the selecting system and analytic estimation criterion on repair materials and methods of the deteriorated RC structures have not yet been set up in domestic. Under these circumstances, deterioration such as shrinkage crack, corrosion of rebar has been often occurred after repair, and this finally results in too frequent repairs. In this study, three types of repair methods were experimentally investigated by the accelerating test in a combined deterioration chamber and long-term field exposure test. Three types of repair methods applied in this study belong to a group of polymer cement mortar, which is commonly used in repair works. According to the results of this study, durability of repair mortar layers and corrosion properties of recovered rebar could be investigated in short period by the accelerating test in a combined deterioration chamber, which can simulate the condition of repeated high-and-low temperature and repeated dry-and-wet environment, spraying chloride solution and emitting
gas. After 36 month long-term filed exposure test in the coastal area, harmful macro-cracks are observed in the polymer cement mortar layer of some repair methods. These crack are considered to result from drying shrinkage of polymer cement mortar. Also, after 36 month exposure, amount of corrosion area and weight loss of rebar are found to be different according to the types of repair methods.
Diagnostic Techniques of Lightning Arresters for DC Electric Traction Vehicles
Kil Gyung-Suk ; Song Jae-Yong ; Kim Il-Kwon ; Moon Seung-Bo ; Shin Gwang-Chul ;
Journal of the Korean society for railway, volume 9, issue 4, 2006, Pages 357~361
This paper dealt with the performance evaluation and the diagnostic techniques of lightning arresters for DC electric traction vehicle. Field Measurements on the protective operation of lightning arresters against surge currents were carried out on running vehicles to acquire the data necessary for the diagnosis. The frequency and the magnitude of surge events were analyzed. Surge currents of
times were recorded in one running service route and their magnitudes were ranges of
. Also, an acceleration experiment on a lightning arrester by the standard lightning impulse current of 8/20 us and 5 kA was performed to know the aging characteristics. After the surge current application of 3,000 times, the reference voltage decreased by 4.5 %, and the leakage current was below 10 uA at the continuous operating voltage and about 50 uA at the rated voltage. From the experimental results, we propose a decision level of leakage current for the arrester used in this paper and designed an arrester tester which analyzes arrester condition by the magnitude of leakage current.
A Study on the Effective Development of Privately Financed Station Buildings
Kim Byong-O ; Chung Jae-Ho ;
Journal of the Korean society for railway, volume 9, issue 4, 2006, Pages 362~370
This study examines the current state of and the problems in privately financed station in Korea, and makes suggestions for improving future development of stations. Problems found in this research are as follows. First. the deployment of resting facilities needs to be planned according to whether the users of privately financed station buildings are electric railway passengers or national railway ones. Second, large scale developments with the object of raising operating revenues should be restrained. Third, there are not sufficient spaces for public benefit such as squares in front of stations. Fourth, the surroundings are congested due to lack of connection to neighboring areas through public transportation. Fifth, the absence of integrated development plans causes many inadequate effects on urban functions and views. Sixth, administrative processes for getting licenses and permits are complicated and relevant authorities are not cooperative. To solve these problems in privately financed station buildings, to contribute to the development of the community and to secure publicness, Many problems are not in station buildings themselves but come from insufficient consideration of relevant factors in constructing the buildings Thus, future development of station buildings and their surrounding areas should be planned in consideration of these problems. We expect that the development of areas surrounding railway stations not only improves railway stations themselves but also leads the environmental reform of urban spaces and activates the local community.
A Study on the Effects of the Fatigue Life due to the Processing of the Butt Weld Specimens and the Fatigue Life Estimation due to the Weld Zone Profiles
Kim Jae-Hoon ;
Journal of the Korean society for railway, volume 9, issue 4, 2006, Pages 371~378
This study investigates the effects of the material properties and the fatigue behaviors in the SM490A material butt weld specimens due to the heat-treatment and the grinding. In the fatigue behavior, the heat-treatment affects the fatigue life. The S-N curves of both matrix specimen and butt weld specimen are reversed at some cycle by the existence or nonexistence of heat-treatment. The grinding on the bead makes the fatigue limit decrease in the all specimens. But the reinforcement removed, the fatigue limit increases at the high cycle. Also, this study investigates the fatigue life estimation by examining butt weld bead profiles. The butt weld beads, which are welded by semi-robot method, have non-uniform bead profiles described by
and h. The stress concentration factors
, are changed by each different
and h from 1.395 to 2.863. Hence, the sensitivity of
is changed by each
and h. As
becomes lower and
and h become higher,
increases. The fatigue life can he estimated very closely for the AAY specimens without residual stress using only butt weld bead profiles. But, fur the AAN specimens with residual stress, the fatigue life must be estimated by considering both the weld bead profiles and the residual stress data.
Influence of Railway on Korean City Structure in the Early
Kim Jong-Hun ;
Journal of the Korean society for railway, volume 9, issue 4, 2006, Pages 379~387
The objective of this study is to describe the influence of railway and railway station on the change of city structure in Korea in the early 20th century. In the 1900s, railway was constructed in Japanese concessions and in new pore cities such as Incheon, Busan, and Wonsan. In the 1920s, railroad construction became related with the cities, which could produce the corps. In the 1930s, railroad also became related to the colonial industrial cities. Traditional city structure was then completely changed because new city structure was focused on not Seoul but Japan or harbors towards Japan. So Korean cities, which were netted by railway, had become the subsystem of Japan in the early 20th century. Korean cities have developed on the basis of this system until 1945. For example, the twelve main cities were chosen through the relationship with Japanese life, and the provincial office governments moved near railroad stations. However nowadays, these cities have possibilities of being international cities, such as Incheon and Busan, because of the extroversion of these cities.
Deductions of KPIs for BSC and Process KPIs for BPM in Railway Construction
Ryu Si-Wook ; Ahn Byung-Jun ; Ryu Myung-Wook ;
Journal of the Korean society for railway, volume 9, issue 4, 2006, Pages 388~393
Recently, Korean government demands that public sectors like railway construction should improve their management efficiency. It is necessary for railway construction supported by government budget to aim at the companywide management efficiency. The Balanced Scorecard (BSC) is known as integrated performance management framework that helps a company to translate strategic objective info relevant performance within an organization. This paper focuses on relationship between KPIs (Key Performance Indicators) used to measure the performance of railway construction industry and process KPT for BPM (Business Process Management). Also, the vision and strategies of the railway construction is introduced, and the CSFs (Critical Success Factors) and the KPI based on BSC is developed. Finally, this paper explores that there is a possibility to fulfill the strategic objectives of railway construction industry through the connectivity between KPI based on BSC and process KPI based on BPM. We explain the detailed procedures with an example of railway construction industry.
A Study on the Unification of The Grounding System of SeoulMetro due to Ageing
Min Byung-Hoon ; Kim Gyunl-Sig ; Chung Young-Ki ;
Journal of the Korean society for railway, volume 9, issue 4, 2006, Pages 394~400
Since Seoulmetro built the first line of electric railway at seoul 1974, the passengers of railway have been increased rapidly, and electric railway requires more electric power for the greater capacity of transport. It is important that we prevent the accidents related with the subway, because all systems of subway are constructed in artificial underground structure. Since the previous versions of the earth system were built to meet the old standards of the electric facility for the lightning, some accidents related with the DC earth fault are causing secondary damages to the electric equipments. So, the old grounding system must be improved, and new standards of grounding system are required. We compare the grounding systems of the domestic railway corporations and the accidents that are related with the grounding systems. And we give ideas to improve the grounding systems and present standards which are suitable to electric railway.
A Study on the Dynamic Behaviors of Ballast Track using Field Test
Park Yong-Gul ; Choi Jung-Youl ;
Journal of the Korean society for railway, volume 9, issue 4, 2006, Pages 401~411
The major objective of this study is to investigate the dynamic behaviors of track due to the deterioration characteristics of ballast for servicing tracks by the field test. The durability of ballast plays an important role in the track behaviour. To estimate the deterioration characteristics of ballast, several tests have been carried out by several scholars. The deterioration characteristics of ballast is one of the most important factor in the dynamic behaviour of track and its life. In this paper abrasion/breakage characteristics of ballast is studied to predict the effect of physical ballast characteristics on ballast track. To reveal deterioration characteristics of ballast, the field test were carried out. The deterioration characteristics, studied in this paper, is applied to the dynamic behaviour of track in various conditions.
A Study on the Safety Demonstration of Train Control System
Shin Duc-Ko ; Lee Jae-Ho ; Lee Kang-Mi ; Hwang Jong-Kyu ; Joung Eui-Jin ; Wang Jong-Bae ; Park Young-Soo ;
Journal of the Korean society for railway, volume 9, issue 4, 2006, Pages 412~418
In this paper we deal with the APARP theory which has been applied for UK railway system and risk assessment method which has been using in the domestic railway system for the safety demonstration. Both techniques are applied to the ATP wayside equipment for interface. Also, fur the applications of each techniques a analysis of the safety activity and a possibility of the application of ALARP theory are evaluated. Finally, we generate requirements of the safety demonstration for the future domestic railway system by way of the analysis of some assumptions and requirement data which can be applied to the risk assessment of ALARP.
A Study on Reliability Prediction for Korea High Speed Train Control System
Shin Duc-Ko ; Lee Jae-Ho ; Lee Kang-Mi ; Kim Young-Kyu ;
Journal of the Korean society for railway, volume 9, issue 4, 2006, Pages 419~424
In this paper we study on a method to predict and to demonstrate the reliability of the Korea high speed train control system in quantitative point of view. For the prediction of the reliability in train control system which is composed of electronic parts, Relax Software 7.7 automation tool is employed and MIL-HDBK-217 Handbook that is a standard for the prediction of the failure rate in electronic components is used. Mean Time Between Failure (MTBF) is predicted based on the failure rate of the subsystems, State Modeling and Markov Modeling method is used to express a reliability function of the train control system composed by hardware redundancy as a function of time. We propose a Reliability Test which is performed on the level of the subsystems and Failure Report, Analysing, Correction action system which use the test operation data to prove the predicted reliability.
A study on Efficient Crime Prevention in the Railway Industry - Focusing on the Ministry of Construction and Transportation's Railway Police Office -
Shin Tack-Hyun ; Lee Yong-Sang ; Do Jeong-Seok ;
Journal of the Korean society for railway, volume 9, issue 4, 2006, Pages 425~431
There are two kinds of police authorities in Korean railway industry, that is, the Special Judicial Police and the Local Subway Police. The existence of two separate entities for common objective of railway security has given rise to problems including inefficiency in performance and lack of customers-focused police service and synergic effects. The purpose of this study is to search for solutions to rail crimes that allows for rapid spatial movements since they take place on fast moving trains.
A Study on Competition Strategy of Korail's Logistics Services Using Hierarchical Fuzzy Process and Fuzzy Relation Equation
Yoo Seung-Yeul ; Lee Jae-Won ; Kwan Yong-Jang ;
Journal of the Korean society for railway, volume 9, issue 4, 2006, Pages 432~440
Prior to the service evaluation, many kinds of its attributes must be identified on the basis of rational decision owing to complexity and ambiguity inherent in logistics service. there are so many evaluation methods but they are not applicable to logistics service the have property of non-additivity and overlapped attributes. Therefore, probability measure can not used to evaluate logistics service but Fuzzy Measure is required. And the method should be easy to calculate it Recently Fuzzy theory has been applied in Various evaluation problem. Fuzzy evaluation based on Fuzzy theory can accommodate fuzziness in judgement with people through introducing Fuzzy Measure. In this paper, Hierarchical Fuzzy Process is applied to evaluate level of logistics service in Korail and the biggest six logistics companies in the korea which is called 3PL Company. Also Fuzzy Relation Equation which is problem identifying evaluation value at these fuzzy evaluation is applied to verify relation between Input and Output data through @-operation. Therefore, we apply this Fuzzy Relation Equation to Hierarchical Fuzzy Process and verify evaluation value which objects of evaluation are able to possess.
Changes in the Rail Freight Policy of the UK focusing on Grants
Lee Yong-Sang ;
Journal of the Korean society for railway, volume 9, issue 4, 2006, Pages 441~448
Following the recent privatization of the UK railway system there has been an increase in the volume of rail freight. It. Influential factors include the problem of road congestion, and policies towards increasing grants. With a focus on grants (government subsidies), this paper examines changes in rail freight, and the tasks facing the UK railway. I attempt to explain recent trends in rail freight grants and changes that have positively influenced the rail freight. In particular, I demonstrate the trends in rail freight and scheme which link the government and industry. Moreover, I explain the grants scheme and method of calculation, concisely. Finally I reveal the characteristics of UK rail grants scheme. In this paper, I argue that grants have played an important role of in the development of freight and that rail freight is more environment friendly than road transport. This paper have a many important aspects. Namely, an account of the introduction of the grant scheme of UK. Also, I explore the method of calculation of these grants. It will give some lessons for Korea rail. In conclusion, I note some suggestions and those problems which impede the freight transport. In future, the problems of some of these problems should be addressed, For example, the lack of infrastructure and development of an adequate train time schedule in case of rail freight have to be improved.
A Study on the Construction of a Control System for the Evaluation of the Speed Tracking Performance of the Personal Rapid Transit System
Lee Jun-Ho ; Shin Kyung-Ho ; Lee Jea-Ho ; Kim Yong-Kyu ;
Journal of the Korean society for railway, volume 9, issue 4, 2006, Pages 449~454
A Study on the Open Loop Characteristics of a Magnetic Suspension System Including Magnetic Flux Feedback
Lee Jun-Ho ; Yun Yong-Ki ; Kim Yong-Kyu ;
Journal of the Korean society for railway, volume 9, issue 4, 2006, Pages 455~460
Numerical Simulation of Dynamic Behaviour of a Gauge-changeable Freight Wagon
Jang Seung-Ho ; Lee Il-Seung ;
Journal of the Korean society for railway, volume 9, issue 4, 2006, Pages 461~466
In order to transport cargo rapidly and safely from the trans-Korean railway to the trans-Siberian railway having a different gauge, a gauge-changeable freight wagon can be used. Because the wagon is expected to run in South Korea, North Korea and Russia, it should have good dynamic performance in these railways. In this paper, the dynamic characteristics of a gauge-changeable freight wagon was analyzed numerically using ADAMS/Rail in each condition of the railways having different gauges and rail profiles. The wagon makes use of load sensitive friction damping and has highly nonlinear behaviour, which is modeled in detail as the full nonlinear dynamic model. It is shown that the running behaviour of the wagon is sensitive to changes in the rail gauge and profiles, however the assessment quantities from the point of view of safety, track fatigue and running behaviour are less than the limit valves.
Deflection Estimation of a PSC Railroad Girder using Long-gauge Fiber Optic Sensors
Chung Won-Seok ; Kim Sung-Il ; Kim Nam-Sik ; Lee Hee-Up ;
Journal of the Korean society for railway, volume 9, issue 4, 2006, Pages 467~472
This paper deals with the applicability of long-gauge deformation fiber optic sensors (FOS) to prestressed concrete structures. A main motivation is the desire to monitor the deflection of the railway bridges without intervenes of the signal intensity fluctuations. A 25 m long, 1.8 m deep PSC girder was fabricated compositely with 22 cm thick reinforced concrete deck. Two pairs of 3 m long-gauge sensors are attached to the prestressed concrete girder with parallel topology. Using the relationship between curvature and vortical deflection and the quadratic regression of curvatures at the discrete point, it is possible to extrapolate the deflection curve of the girder. The estimated deflection based on the developed method is compared with the results using conventional strain gauges and LVDTS. It has been demonstrated that the proposed instrumentation technique is capable of estimating the vertical deflection and neutral axis position of the prestressed concrete girder up to weak nonlinear region.
Economic Analysis for Vehicle Maintenance Information System of Seoul Metro
Chung Choong-Sik ;
Journal of the Korean society for railway, volume 9, issue 4, 2006, Pages 473~481
This study attempts to estimate economic benefits in terms of cost sayings and qualitative effects resulting ken implementation of new vehicle maintenance information system. It is widely expected that the effect of new vehicle maintenance information system will be significant in cost savings by information sharing and electronic documentation. To evaluate the economic feasibility of new system implementation, the study conducted seven subsystems case studies on the vehicle maintenance information system of Seoul Metro. Economic benefits are estimated by measuring the time savings, in turn, are calculated into cost savings by multiplying the average wages per hour of employee. The result of case study showed that over the 20 billion Won will be saved owing to new vehicle information system implementation. In conclusion, this study will contribute to the field of practices for the most, in evaluation of the economic benefits resulting from new information system implementation in the railway organization.
A Study on the Systems Engineering Management Plan for the Railway Safety Project
Choi Yo-Chul ; Cho Yun-Ok ;
Journal of the Korean society for railway, volume 9, issue 4, 2006, Pages 482~486
The Systems Engineering Management Plan (SEMP) is the primary, top level technical management document for the integration of all engineering activities at the project plan phase. This document defined the activities to plan, control, and perform overall engineering integration. To develop the SEMP for Railway Safety System, several standards are reviewed and analyzed. And then a common requirement for SEMP preparation is derived from the results of analysis. Also, the SEMP example available practically applies to Railway Safety System. In particular, The SEMP focused on controling technical program management has been organized so far, but in this study the detailed contents of SEMP put stress on project management is derived. And it is related to each other between project management and technical engineering management. At the end, to continuously manage the items and contents of the SEMP, a database management and an automatic document generation system is presented using Computer-Aided Systems Engineering (CASE) tool.
A Study on the Application System of the Systems Engineering for the Railway Total Safety Project
Choi Yo-Chul ; Cho Yun-Ok ;
Journal of the Korean society for railway, volume 9, issue 4, 2006, Pages 487~492
This paper presents the Case of Systems Engineering Application for the Railway Total-Safety Project. Key points to consider for project are: 1) Establish the SE Based-Project organization system, 2) Define the SE Activities, 3) Manage technically the SE Based-Project, etc. They were of much help that the Railway Total-Safety Project which were efficiently implemented and managed. As I take it, the Systems Engineering is very reasonable approach for the systematical and technical conduct of a project.
Pile Load test on a Large Barrette Pile and a Bored Pile for the Identification of the Load Transfer Characteristics
Han Sung-Gil ; Park Jong-Kwan ;
Journal of the Korean society for railway, volume 9, issue 4, 2006, Pages 493~498
In this study, two large pile load tests were performed in the deep sand gravel deposit of Nakdong river basin so that the characteristics of the load transfer was identified. The fully instrumented rectangular barrette pile in the size of
and the circular bored pile of the diameter 1.5 m were placed into the ground below 50 m. Under the applied loads of 2,400 tonf and 4,000 tonf, the test results of the load transfer showed the portion of 83% and 93% of the applied loads on the barrette pile and the bored pile, respectively, were supported by the skin friction along the pile shaft. It was revealed that the most of these skin friction mobilized in sand layer underlying clay layer having N-value more than 30 and that the friction per unit area of the bored pile was larger than the friction of barrette pile. However, if embedded in the stiff sand graval layer, the both piles were proven to be sufficient for using as the friction piles.
Simulation of a Maglev Vehicle Running on the Flexible Guideway
Han Hyung-Suk ; Kim Young-Joong ; Shin Byung-Chun ; Kwon Jeong-Il ;
Journal of the Korean society for railway, volume 9, issue 4, 2006, Pages 499~503
Maglev vehicles, which are levitated and propelled by electromagnets, often run on elevated flexible guideways comprised of steel, aluminum and concrete. Therefore, an analysis of the dynamic interaction between the Maglev vehicle and the flexible guideway is needed in the design of the critical speed, ride, controller design and weight reduction of the vehicle. This study introduces a dynamic interaction simulation technique that applies structural dynamics. Because the proposed method uses detailed 3D FE models, it is useful to analyze the deformation of the elevated flexible guideway, the dynamic stress, and the motion of the vehicle. By applying the proposed method to an urban transit Maglev vehicle, UTM01, the dynamic response is simulated and validated. From the result of the study, we concluded that the simulation of dynamic interaction between the Maglev vehicle and the flexible guideway is possible and a potential of using computational mechanics.
Colored-LCD Type Train Destination Indicator System for Visibility Improvement
Hwang Jong-Gyu ; Lee Jae-Ho ; Yoon Yong-Ki ; Shin Duc-Ko ; Jo Hyun-Jeong ;
Journal of the Korean society for railway, volume 9, issue 4, 2006, Pages 504~509
Currently, most of TDIS(Train Destination Indicator System) is operated colored-LED type equipment in Korea. This current LED type TDIS equipment has not graceful display and causes passenger's fatigues because of the LED module inherent characteristics as a display light source, high power consumption, high operating and maintenance costs, and et al. To address these several, we are developed new colored-LCD type TDIS equipment. According to our developed new TDIS equipment, we can achieve high resolution and graceful color stone of information display. Thus high graded service are able to provide to passengers. In addition, LCD module decreases power consumption, and it can be used permanently by changing only backlight in comparison with conventional equipment. Therefore we can decrease the maintenance cost and extend durability-period of TDIS equipment using new equipment.