• 전력전자학회논문지
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• 제25권6호
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• pp.496-502
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• 2020

The reliability of a solid-state transformer (SST) is one of the important aspects to consider when replacing a conventional low-frequency passive transformer with SST for urban railway vehicles. Lifetime evaluation of SST in the design phase is therefore essential in guaranteeing a certain SST reliability. In this study, a lifetime evaluation of power semiconductor devices in SST is performed with respect to temperature stress. For a case study, a 3 MW SST with three kinds of power modules (one IGBT module and two SiC-MOSFET modules) is used for the lifetime estimation under the operation profile of urban railway vehicles.

• International Journal of Internet, Broadcasting and Communication
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• 제14권2호
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• pp.89-97
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• 2022

The growth of online market is accelerating due to the development of technology and the era of pandemic. In order to deliver the ordered product to customers courier service should be used. In addition, the courier logistics market is growing with the growth of the online market. With the growth of the logistics market, traffic and environmental problems are emerging as social issues. Logistics technology of urban community logistics courier terminal system utilizing vacant space in the city has been developed as a new alternative to environment and traffic problems by increasing logistics efficiency in the city area. In this study, we propose a concept of a system that performs operational concept definition and scenario analysis by applying model-based perspective analysis to urban community logistics courier terminal system under development. Through this study, we defined the operating concept of the urban community logistics courier terminal, which is the target of development, and defined the scenario for system operation by grasping the structure and function of the system and applied it to system development.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2011년도 제42회 하계학술대회
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• pp.2202-2203
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• 2011

AC substation of urban transit supplies a suitable AC power on electricity vehicles. AC substation is verified electrical safety of system through pre-operation inspection on electrical installations to be supplied power from KEPCO. However, because test items and method for AC traction system are unprepared on pre-operation inspection, the general safety and performance verification of AC traction system are very insufficient. Therefore this paper analyze the test examples such as factory equipment tests, factory combined tests and railway tests for the safety and performance verification of AC traction system and present a suitable test items and test standard in domestic.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2008년도 춘계학술대회 논문집 전기설비전문위원
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• pp.88-90
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• 2008

철도시스템은 철도차량을 비롯한 다양한 시스템이 유기적으로 결합된 산업으로 제한된 물적, 인적 자원을 투입하여 요구하는 성능 및 서비스를 달성하기 위한 총비용을 경감하기 위한 문제에 늘 직면해 있다. 본 논문에서는 전동차 도입 및 유지 보수에 따른 합리적으로 평가할 수 있는 전동차 수명주기비용(LCC; Life Cycle Cost)에 대한 기초연구 측면에서 고찰해 보았다.

• International Journal of Internet, Broadcasting and Communication
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• 제7권2호
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• pp.105-108
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• 2015

There are a lot of traffic jams in the metropolitan area and the commuting time has been longer nowadays. So the urban people has been interested in the GTX(Great Train Express) project in Korea. The GTX is the train which runs at 200km/h speed in underground tunnels. If the train also operates at high speed in tunnel section, the pressure wave will happen and the uplift force of pantograph may vary abruptly. If the rigid trolley bar system is used in tunnel section, it is difficult to improve the commercial speed of train. In order to improve the train speed in tunnel section, this paper presents the new pantograph concepts which can change the suspension stiffness and deals with the dynamic behavior characteristics of pantograph according to the parameter variation.

• 소음진동
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• 제7권5호
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• pp.827-836
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• 1997

To suggest the standard of railroad noise and its measures and grasp its status 15 open sites of the Jungang. Taeback and Youngdong line in which the background noise level is very low and the railroad is at grade and 7 urban sites of the Kyungboo and Honam line were selected and the sound level which 373 trains passing through the former and 271 trains passing through the latter emitted was investigated. The community response of railroad noise was surveyed for apartment near wayside. Noise reduction of wall for apartment at the wayside was investigated. The prediction of electric train subway noise is derived for the environment impact assessment.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2001년도 춘계학술대회 논문집 전기기기 및 에너지변환시스템부문
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• pp.407-409
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• 2001

도시철도 공사, 지하철 공사, 철도청 등 각각의 운영기관이 독자적으로 정보화를 추진함으로서 국가적으로 중복투자 및 예산이 낭비되고 각 시스템간 호환성이 부족하여 정보를 공유할 수 없어 비효율적인 시스템 구축이 이루어지고 있는 실정이며 표준화된 정보의 부재 및 부정확한 표준에 의한 업무의 비효율성이 가중되고 사고예방 및 신속한 복구지원을 통한 대국민 안전서비스 제공 및 열차운행의 안전성 확보에 미흡한 실정이다. 본 논문은 국내 도시철도분야를 세계적인 경쟁력을 가진 분야로 육성하고 수명주기비용(Life Cycle Cost)을 최소화 및 최적화하여 경제성을 극대화시킨 도시철도 정비유지체계 정보화 시스템의 개발 및 시범적용을 위해 정보전략계획 (ISP)을 수립하기 이전에 수행한 선행연구 결과이다.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2001년도 춘계학술대회 논문집 전기기기 및 에너지변환시스템부문
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• pp.413-415
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• 2001

A railroad vehicle(Light weight electric rail car, Urban railroad, High-speed railroad) need to construct propulsion- system capacity experiment equipment to test performance or to estimate confidence. Experiment equipment in interior have been used Flywheel which is equal to the same inertia as railroad straight moment. But mechanical inertia using flywheel don't change inertia and can't embody traveling-struggle which is similar to actual traveling-struggle. We propose the method to embody electric railroad load system with inertia using electric servo motor in order to get the characteristic of real vehicle load, and confirm this algorithm with simulation and experiment.

• 대한전기학회:학술대회논문집
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• 대한전기학회 2001년도 춘계학술대회 논문집 전기기기 및 에너지변환시스템부문
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• pp.359-361
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• 2001

도시철도 유지보수 정보시스템 구축에서 차량정비 유지체계시스템에 관한 것으로 차량설계 변경 및 이력관리를 위한 도면시스템 구축과 차량조립의 각 부품별 관리를 위한 계층구조관리 시스템을 구축하는 것이며 또한 차량 유지보수를 위한 전자정비 매뉴얼 구축과 부품 설계변경 및 이력정보 관리를 위한 문서관리 시스템 등을 구축하는 것이다.

• 한국재난정보학회 논문집
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• 제8권3호
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• pp.258-266
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• 2012

광역철도사업 추진과 관련하여 분류기준, 지정요건 등이 모호하여 지방정부는 재정지원비율이 높으면서 동시에 운영부담이 없는 국가시행사업으로 요구하게 되는 문제점을 낳았다. 이에 본 연구는 광역철도 사업이 본래의 기능을 충실히 수행할 수 있도록 지정기준을 재정립하였으며, 광역철도 사업의 세부 유형구분, 시행주체, 지정절차 등에 대해서도 규정의 정립을 제안하였다. 인구주택총조사 결과를 이용하여 광역철도의 범위를 정하고, 표정속도를 높여 도시철도와의 차별성을 확보하는 등의 형태로 광역철도 지정요건 개선방안을 마련하였다. 이에 따라 중앙정부의 재정소요를 경감하고 지방정부의 책임성을 높일 것으로 기대된다.