• Proceedings of the KSR Conference
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• 2011.10a
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• pp.14-21
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• 2011

Reliability means that a product maintains its initial quality and performance at certain period of time(time, distance, cycle etc) under given condition without failure. Given conditions include both environmental condition and operating condition. Environmental condition means common natural environment such as temperature, humidity, vibration, and working condition means artificial environment such as voltage, current load, install place, hours of use, which occurs during using the product. In the field of railway vehicles, although components of railway vehicles with reliability are the trend of mandatory as persisting period of railway vehicles is extended, using components of railway vehicles is insufficient for the practical reliability assessment. but the meaning of the first railway operating agnecy to acquire the parts in the field, the data suggest the reliability of products if you can and can show the reliability of modular units and modular units can provide the reliability of if you can present reliability of the entire system is thought to be here. In this study, lifespan of micro-switch for master controller is analyzed and prediction is performed based on its field data considering the special circumstances of railway vehicles operating agency, such as a large number of trains operates on the same line.

• Journal of the Korean Society of Systems Engineering
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• v.7 no.1
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• pp.57-69
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• 2011

Reliability means that a product maintains its initial quality and performance at certain period of time(time, distance, cycle etc) under given condition without failure. Given conditions include both environmental condition and operating condition. Environmental condition means common natural environment such as temperature, humidity, vibration, and working condition means artificial environment such as voltage, current load, install place, hours of use, which occurs during using the product. In the field of railway vehicles, although components of railway vehicles with reliability are the trend of mandatory as persisting period of railway vehicles is extended, using components of railway vehicles is insufficient for the practical reliability assessment. but the meaning of the first railway operating agency to acquire the parts in the field, the data suggest the reliability of products if you can and can show the reliability of modular units and modular units can provide the reliability of if you can present reliability of the entire system is thought to be here In this study, lifespan of micro-switch for master controller is analyzed and prediction is performed based on its field data considering the special circumstances of railway vehicles operating agency, such as a large number of trains operates on the same line.

• Journal of Korean Society for Quality Management
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• v.39 no.1
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• pp.34-44
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• 2011

In this research, the selection of rail tour items of importance and achievement of service quality will be different 'analysis under the assumption that the relationships between them, were studied. Through this research, managers' subjective judgments of the customer rather than by a judge, ie, the true value to our customers think of the rail service quality for tourism products is crucial to develop the important elements. In addition, market-oriented thinking is to present the basic data of the transition. To summarize the conclusions of this paper is as follows. First, what tourists are seeking, constant research and improvement of tourism services should be looking for ways. Secondly, the focus on service quality aspects of products and the urgent need to identify the side of part "Concentrate Here" and "Possible Overkill" by reducing the effort to improve the efficiency of management is considered to be accelerated. Finally, most point in terms of focus and means of transport for the tourism sector as well as the railway tourism products, using the railway as a tourism product now on tour items should be changed.

• Proceedings of the KSR Conference
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• 2005.05a
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• pp.151-156
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• 2005

The objective of this study is to devise an accident scenario analysis method adept at creating accident scenarios at the Preliminary Hazard Analysis(PHA) step of a hazard analysis for railway system. This approach was inspired by the Quality Function Deployment(QFD) method, which is conventionally used in quality management and was used at the systematic accident scenario analysis(SASA) for the design of safer products. In this study, the QFD provides a formal and systematic schema to devise accident scenarios while maintaining objective. The accident scenario analysis method first identifies the hazard factors that cause railway accidents and explains the situation characteristics surrounding the accident. This method includes a feasibility test, a clustering process and a pattering process for a clearer understanding of the accident situation. Since this method enables an accident scenario analysis method to be performed systematically as well as objectively, this method is useful in building better accident prevention strategies. Therefore, this study can serve to reduce railway accident and be an effective tool for a hazard analysis.

• Journal of Institute of Control, Robotics and Systems
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• v.12 no.12
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• pp.1241-1248
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• 2006

In high reliability systems for industrial network such as railway signal system, fieldbus protocols have been known to satisfy the real-time and fault tolerant requirements. But, the application of fieldbus has been limited due to the high cost of hardware and software, and the difficulty in interfacing with multi-vendor products. Therefore, as an alternative to fieldbus, the computer network technology, especially Ethernet(IEEE 802.3), is being adapted to the industrial network. In this paper, we propose a switched Ethernet based railway signal system because of its very promising prospect for industrial application due to the elimination of uncertainties in the network operation. In addition, we propose the redundancy architecture for the reliability of network components. More specifically, this paper presents an analytical performance evaluation of switched Ethernet for railway signal system, and shows experimental evaluation of redundancy architecture.

• Proceedings of the KIEE Conference
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• 2006.07b
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• pp.1132-1133
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• 2006

The approach, for ensuring the quality and safety of a railway software can be considered with two points of views seeing from products, and from processes. The process point of view is to validate maturity of the organizations in accordance to the judging processes of organizations, which are specified by CMMI(Capability Maturity Model Integration) or SPICE(Software Process Improvement and Capability dEtermination : ISO/IEC15504). In this paper, we are trying to find approaches to estimate the maturity of manufacturer and assessment organization in the railway system.

• Proceedings of the KSR Conference
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• 2008.06a
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• pp.2130-2138
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• 2008

The present study investigates the ventilation effects on smoke spreading characteristics in railway tunnels with the rescue stations. Experiments were carried out for n-heptane pool fires with a square length 4 cm at different fire locations, and the heat release rates (HRR) were obtained by the measurement of burning rates. In addition, using the commercial code (FLUENT), the present article presents numerical results for smoke behavior in railway tunnels with rescue station, and it uses the MVHS (Modified Volumetric Heat Source) model for estimation of combustion products resulting from the fire source determined from the HRR measurement. As a result, it is found that smoke propagation is prevented successfully by the fire doors located inside the cross-passages and especially, the smoke behavior in the accident tunnel can be controlled through the ventilation system because of substantial change in smoke flow direction in the cross-passages.

• Proceedings of the KSR Conference
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• 2009.05a
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• pp.296-305
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• 2009

Since the beginning of civilization, people live in the times that changes rapidly everyday. Above all things, In April, 2004 the first opening of KTX(high-speed railway) that has been considered as the greatest revolutionary project shrinks the whole nation into a quarter of a day life zone and has repeated the constant change and development. But now, In comparison with ordinary train system KTX fails to notice revenue for travel-product and other many factors of increased revenue. This study introduces and analyzes the present condition of high-speed railway and indicate 'the plan to increase revenue' and 'the effect of creating revenue' through a travel-product on the basis of the travel-products connected with KTX. This study focuses on 'KTX memory train travel' and propose revenue and advertisement-effect created from targeting the middle-aged market. In addition, For improving KORAIL's image and approaching the customer more and more friendly, it grasp diverse events and advertisement plans.

• Proceedings of the IEEK Conference
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• 2006.06a
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• pp.1025-1026
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• 2006

The approach, for ensuring the quality and safety of a railway software can be considered with two points of views seeing from products, and from processes. The process point of view is to validate maturity of the organizations in accordance to the judging processes of organizations, which are specified by CMMI(Capability Maturity Model Integration) or SPICE(Software Process Improvement and Capability dEtermination : ISO/IEC15504). In this paper, we are trying to find approaches to estimate the maturity of manufacturer and assessment organization in the railway system.

• Proceedings of the KSR Conference
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• 2005.11a
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• pp.516-521
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• 2005

The challenge for companies is to bring to the market a stream of new and improved, added-value, products and services that enable the business to achieve higher margins and thus profits to re-invest in the business. Especially in these days, railway industry has met the competitive challenges of new transportation technologies or the demands of new passenger transportation needs with a spirit of innovation and change that has reshaped the business several times over the course of the century. Like other railway organization, KR-network business is committed to optimising long term performance for its clients in terms of safety, reliability and profitability.