• 한국철도학회:학술대회논문집
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• 한국철도학회 2010년도 춘계학술대회 논문집
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• pp.104-109
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• 2010

Management innovation as a strategic alternative to create competitive advantages in the global market, is being actively progressed by conglomerates such as Samsung, LG and Toyoda as they cut a brilliant figure in the 21 century by using various innovation methods. However, the domestic railway sectors, in particular urban railway depots have neglected management innovation as they undertake Operation and Management in non-competitive settings of a corporate enterprise. This paper analyzes the critical success factors that have switched the most obsolete depots to a benchmark model for domestic railway depots based on the remodeling businesses undertaken in Gunja rolling stock maintenance office, Korea's first urban railway depot, along with 5S 6sigma program.

• 한국도시철도학회논문집
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• 제6권4호
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• pp.299-307
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• 2018

철도 비상대응계획 수립에 관한 지침에 의하면 도시철도차량의 비상상황에 대한 자동방송 및 조명시스템에 대한 설비가 반드시 필요하다. 도시철도차량 안전기준에 관한 규칙에 의하면 비상상황이 발생하였을 때 비상조명은 30분 이상 정상동작할 수 있어야 하고, 비상방송은 승무원에 의해 안내되어야 한다. 하지만, 현재 운영되는 비상시스템은 운영기관 마다 설치여부 또는 설치된 제품이 다르며, 유지보수 및 관리가 되고 있지 않아서 동작여부를 판단하기 어렵다. 따라서, 본 논문에서는 비상시스템의 표준화를 위한 모듈화 방안에 대해서 연구를 수행한다. 도시철도차량의 사고 상황과 사고 발생 시나리오를 분석을 기반으로 기존 비상시스템을 대체할 수 있는 비상방송 및 조명의 모듈화 방안을 도출하였다. 각 방안의 장단점을 비교한 결과 유지보수와 비용을 고려한 최종 모듈화 방안을 확정할 수 있었다.

• 전기학회논문지
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• 제65권3호
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• pp.511-519
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• 2016

This paper is proposed control algorithm for the using thyristor of the parallel dual converter for Urban railway power supply in order to return the regenerative power generated by regenerative braking in urban railway train. Conventional control algorithm of Thyristor dual converter for urban railway power supply has voltage variation within a control range of hysteresis band. The purposed control algorithm of the parallel thyristor dual converter is to maintain a constant voltage without voltage variation in accordance with variable load through the Sequential mode change. And the control algorithm need calculating optimum initial firing angle to consider magnitude of the load current slope. For this purpose, Proposed algorithm for sequential conversion mode of the dual converter was verified by applying for the simulation.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2006년도 춘계학술대회 특별세미나. 특별세션
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• pp.34-45
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• 2006

Making practical use of urban MAGLEV system which is tried by government includes technique development and railway construction. Because huge amount of money will be spent on this project, feasibility study is being carried out in order to check the feasibility and to devise the master plan in prior to making practical use of urban MAGLEV system. The key issues of feasibility study are possibility of technique development, economical feasibility, location of a model railway and the improvement of related laws and regulations. This paper shows the approach to solve these key issues.

• 한국철도학회논문집
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• 제7권3호
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• pp.245-250
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• 2004

The safety of staff, customers and of general Public in general viewed as one of the most important requirements in the urban transit. The maintenance computerization system for car of urban transit is a part of standardization and development of urban transit system, and We have been performed the establishment of maintenance computerization system from 2001 to 2005. The RAMS (reliability, availability, maintainability and safety) estimation for maintenance computerization system are utilized in a variety of computerization system for user's convenience and safety in maintenance. Ever since its inception though, the urban transit has searched for ways to improve reliability, availability, maintainability and safety of the railway subsystem. Provision of a reliable maintenance system include RAMS of the vehicles plays a very important role in achieving a safe system.

• Journal of Electrical Engineering and Technology
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• 제12권2호
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• pp.981-987
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• 2017

In this paper, we estimate the economic benefits of Energy Storage Systems (ESSs) for peak load shaving in an urban railway substation using the annual cost. The annual investment cost of ESSs is estimated using Net Present Value (NPV) and compared with the cost reduction of electricity by the ESS. The optimal capacities of the battery and Power Converting System (PCS) are determined for peak load shaving. The optimal capacity of the ESS and the peak load shaving is determined to maximize the profit by the ESS. The proposed method was applied to real load data in an urban railway substation, and the results show that electric power costs can be reduced. Other aspects of the ESS, such as the lifetime and unit price of the battery, are also investigated economically.

• 전기학회논문지
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• 제63권12호
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• pp.1752-1758
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• 2014

This paper evaluates economic benefits of ESS (Energy Storage System) for peak load shaving in the substation of urban railway. For this purpose, the method to determine capacities of ESS and PCS (Power Conditioning System) for peak load shaving is proposed. Then the economic benefits of those devices are evaluated using net present value method. The proposed methods are applied to actual measurements of loads in the substation of urban railway. The results show that electric power costs can be reduced and the economic benefits of ESS for peak load shaving mainly depends on the price of battery.

• 한국철도학회논문집
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• 제6권3호
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• pp.203-208
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• 2003

With designing alignment of railway for urban rail transit, a greater attention is paid to the riding safety and the comfort of the passengers. Especially, cant, transition curve, minimum curve radius are considered as very important alignment factors for the curve. For the above alignment factors, in this study, comparative studies on the design criteria of foreign rail transit are conducted. And reasonable design criteria of the alignment for urban rail transit are proposed.

• 대한전기학회:학술대회논문집
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• 대한전기학회 1998년도 하계학술대회 논문집 A
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• pp.365-367
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• 1998

This paper shows the form of the optimal solution and how to minimize energy of train driving control. In this paper we consider the case where a train is to be driven by manual operation mode along a straight level track, and with speed limits. Using the constrained optimal technique(Lagrange Function & Kuhn-Tucker equations), we constructed optimal train driving strategy.

• 대한교통학회지
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• 제32권3호
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• pp.256-265
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• 2014

우리나라는 고령화 추세의 가속화로 인한 도시철도의 노인무임수송 급증이 만성적 적자를 초래하는 이유가 되고 있다. 도시철도의 노인무임수송으로 인한 지속적 적자가 앞으로도 예상되는 가운데 같은 대중교통 수단인 버스의 경우 노인인구에 대해 일반요금을 부과하고 있는 반면, 도시철도만 무임수송을 행하고 있다는 점은 대중교통 이용 요금체계 상의 형평성 문제를 제기할 수 있다. 따라서 본 연구는 노인층의 무임수송 및 대중교통 형평에 관한 의식조사를 실시하고, 도시철도와 버스간의 노인인구에 대한 요금체계 이원화에 따른 형평성문제의 대안으로 두 수단 간의 적절한 요금비율의 도출을 통해 도시철도와 버스를 함께 이용할 수 있는 방안을 제시해 노인무임수송으로 인한 문제를 개선할 수 있는 방안을 도출하고자 한다. 이와 같은 대안은 공기업이 자주성 있는 경영을 할 수 있게 함과 동시에 대중교통수단 간의 형평의 문제도 개선할 수 있는 방안으로 도시철도의 노인무임수송으로 인한 만성적자를 개선할 수 있는 여러 방안 중 하나가 될 수 있을 것이다.