• Proceedings of the KSR Conference
• /
• 2011.10a
• /
• pp.1136-1142
• /
• 2011

The approaches to systematic track maintenance methods set out in this study are only a small part of the many work activities on railway track. The application of modern maintenance technology enhances the value of modern railway operation and enables the track system to be kept in top condition.

• Journal of Information Technology and Architecture
• /
• v.11 no.4
• /
• pp.441-448
• /
• 2014

The application of spatial information has drawn significant attention from a wide range of industries. Railway spatial information facilitates the cooperation among related parties and improves the efficiency of asset management and operations. This study proposes the structure of Railway Object IDentifier(ROID) on railway spatial information. Current facility management and train operation are based on relative positioning system. Despite many advantages, relative positioning system causes serious problems such as the entire reconfiguration of positioning in the case of line change. Another major concern is the interface compatibility between individual facilities with different relative positioning. ROID based on absolute positioning addresses these issues, allowing the information exchange and convergence between independent parties. This study proposes ROID based on OID standard with object IDentifier and service object-oriented reference system. Our ROID employs the absolute positioning and the unique identifier, maintaining the compatibility with existing management system.

• Journal of the Korea institute for structural maintenance and inspection
• /
• v.20 no.2
• /
• pp.110-121
• /
• 2016

In the decision-making, such as selection of structure, construction method, or time and scheme of maintenance, the evaluation of life-cycle cost(LCC) is of great importance. The maintenance cost occupy a large portion of the LCC of the railway track as well as the initial construction cost. Futhermore, the proportion of the maintenance cost is much higher in the ballasted track. Thus, the importance of the LCC evaluation is higher than in any other engineering structures. In this study, a LCC model that can consider various design parameters such as the type of track structure, annual traffic volume, axle load, train speed, and proportion of curve sections and engineering structures has been developed. Fundamental data for calculating costs also have been presented. Based on the model and data proposed, the trends in the variation of LCC according to the design parameters were examined and the most important design parameters in the LCC analysis of railway track were investigated. The results show that the proportion of renewal and operational costs is much higher in the ballasted track than in the concrete track, and the annual traffic volume and ballast taming period are most significant factors on the LCC of the ballasted track. On the contrary, it is revealed that the proportion of the initial construction costs in the concrete track is much higher, and the LCC of the concrete track is less sensitive to the traffic volume, train speed, and axle load.

• Journal of the Korean Society for Railway
• /
• v.10 no.2 s.39
• /
• pp.167-178
• /
• 2007

In general, it is known that the concrete ballast track is possible to reduce a cost of maintenance activities cause of maintenance free by restrictive maintenance in application of track ballast structures. However, if deteriorations and fracture mechanism of a material are considered, proper maintenance activities and repairing are continually required. For the problems, we evaluated an economical efficiency of the gravel ballast and the concrete ballast on a proper level of maintenance activities. As the method based on history path is difficult to obtain sufficient reliabilities cause of an absence of real data for maintenance activities, we chose the delphi survey method by professional group, and we obtained the appropriate index and profiles for maintenance activities. As a result, we founded that effects for cost reduction can be expected by preventive maintenance management, and we proposed economical restrictions and life cycle cost for track ballast structures in a life cycle.

• Journal of the Korea Society of Computer and Information
• /
• v.18 no.5
• /
• pp.77-85
• /
• 2013

In this paper, we present the cost measurement metrics for the operation management and service improvement besides the general maintenance. The cost measurement metrics of the operation management and service improvement are based on the metrics that are classified and summarized precedent studies and complemented by empirical measuring indicators, and we propose the maintenance cost estimation model based on this metrics. The maintenance costs can be calculated detailedly, because the proposed metrics can be used selectively, depending on the scope of the information system maintenance. The effectiveness of the proposed maintenance cost measurement metrics and cost estimation model is verified by comparison between existing studies and our research.

• Journal of the Korea institute for structural maintenance and inspection
• /
• v.8 no.4
• /
• pp.123-133
• /
• 2004

The evaluation standard method of weld zone in rails is not exhibited in case of the domestic and the outside about ultrasonic inspection method. therefore, practical affairs a mans on the ground know very little about evaluation method of pass and failure. This paper discuss about ultrasonic exploration of weld zone in railway rails to know practical affairs a mans that the first, "problem and improvement direction of domestic track construction specifications applied according to a place ordering" and the second, "the method applied of ultrasonic exploration test of weld zone in railway rails".

• Proceedings of the Membrane Society of Korea Conference
• /
• 1998.10a
• /
• pp.146-149
• /
• 1998

우리 나라는 1994년 말 현재 654개소에 28,434개소의 수도사업체가 있으며, 이중 간이상수도는 26,363개소로 총 93%를 차지하고 있다. 간이상수도와 같은 소규모 수도사업체에서는 재정적인 기반이 취약하며, 기술자 등이 인재확보가 어려운 형편이다. 이에 따라 대부분의 경우 수도시설의 일상적인 유지관리에 많은 불편이 따르고 있을 뿐만 아니라 적정 수질을 확보하기가 곤란한 실정이다. 간이상수도에서 수질이 좋은 물을 효율적으로 공급하기 위해서는 기존의 정수처리 시스템으로는 어려운 형편이다. 즉, 우리 나라 간이상수도의 정수처리과정은 소독을 기본으로 하여 응집침전, 급속모래여과, 등의 고액분리조작을 주체로 하고 있어 각 과정에 대한 유지관리에 많은 노력이 필요하다. 이에 따라 간이상수도에서는 보다 효율적으로 수질관리가 이루어질 수 있는 장치 및 시스템의 개발이 절실하다.

• Proceedings of the KSR Conference
• /
• 2010.06a
• /
• pp.1525-1532
• /
• 2010

Modern surveying techniques have been progressed to get the absolute position of a single coordinate system at any point on the earth with the advent of the Global Navigation Satellite System and One-stop digital equipment. In addition, as the speed of the railway has been increasingly faster, in determining the location of major facilities including the center of tracks, it is required to the sophisticated precision. The surveying of railway construction has applied the technical supports and procedures in accordance with the current requirements. In this study, the applicable guidelines of surveying on practical issues and alternatives would be examined, analyzed, and presented by using the empirical data of pilot areas in the process of design, construction, and the maintenance of railway.

• Journal of Korean Society of Steel Construction
• /
• v.18 no.1
• /
• pp.53-58
• /
• 2006

The aim of this paper is to verify the dynamics stability of the continuous PSC Box bridges on the high-speed Kyoung-bu railway when a high-sped train runs through it. An experimental study was carried out to investigate the dynamic behaviors of the PSC Box railway bridge, which had ben designed based on dynamic design criteria. As a result, it was determined that PSC Box railway bridges possess enough dynamics stability for use by high-speed trains. According to the result of a field test (dynamics measuring analysis) that was conducted, an application of the natural frequency of train speed and the adjustment of the bridge's span length will allow one to come up with a more economical and suitable bridge design. Furthermore, it was found that the continuous control of the bridge's dynamic behavior and the bridge's maintena nce require the recording of data. The results of this study are very important in evaluating the structural stability of high-speed line bridges.

• Journal of the Korea institute for structural maintenance and inspection
• /
• v.19 no.5
• /
• pp.1-9
• /
• 2015

Recently Honam high-speed railroad line is constructed in southern part of Korea. This line is for next generation HST named HEMU-430X. But there is a limestone mine near this line and this mine will make a process to dig a passageway under the railway line. In this case, safety of railroad system and stability of mine are crucial problems on both sides. By measuring mine blasting vibration and calculating regression equation, effect of mine blasting to train running is investigated quantitatively. 0.5 kine (cm/sec) is applied as a management specification of vibration based on field measurement. In this study, changes of blasting patterns are suggested to control vibration of mine blasting. And the effect of train vibration to mine is also invesitigated by numerical analysis.