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정락교(Rag-Kyo Jeong),윤용기(Young-Ki Yoon),김백현(Baek-Hyun Kim) 대한전기학회 2011 전기학회논문지 Vol.60 No.9
Studies suggested an increase in the competitiveness and roles of mainline railways like speed and accessibility improvement, as a fundamental direction of the National Transport Network Plan. At this point, topics presented especially for strengthening the role of human and environment centered transportation: as to the greatly improved speed competitiveness, there are an operational speed above 180㎞/h ∼ 200㎞/h and traveling within 2 ∼ 3 hours among big cities. As to accessibility improvement, there are accessibility to main railway stations within 30 minutes, and the improvement of accessibility, safety, eco-friendliness, amenity etc. As a part of these suggestions, field specific plans were proposed for the establishment of expressed mainline railway network in Korea such as train’s, civil structures, trolley lines etc. In this paper we analyzed the conventional lines and systems to figure out whether to change details in terms of H/W of signaling system. Additionally, we reviewed the compatibility or difference of signalling system depending on train’s speed. With this result, we deduced the number of virtual blocks specific to the speed of 180㎞/h, 200㎞/h and 230㎞/h, which were showed for the speed improvement considering each variable like blocks, braking distance etc. In this way, we suggested the railway signal system establishment plan considering safety operation.
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정상기(Sang-Gi Chung),정락교(Rag-Kyo Jeong),김형철(Hyung-Chul Kim) 대한전기학회 2010 대한전기학회 학술대회 논문집 Vol.2010 No.11
전기철도의 DC 급전시스템에서 레일전위상승 값을 분석하는 알고리즘을 제시한다. 레일전위는 대지로의 누설저항에 의해서 상승하게 된다. 이 누설저항이 삽입된 급전시스템 등가회로는 노드전압 회로 분석방법에 의해 직접 해석이 되지 않는다. 메쉬전류 회로분석 방법에 의해서 해석될 수 있는데, 이 메쉬전류 회로해석 방법의 적용에도 문제가 있다. 그것은 철도부하가 저항으로 주어지지 않고 파워(power)로 주어지므로 반복해석(iteration) 방법이 사용되어야 하고, 이 반복해석 방법은 적정한 초기값을 요구하는데 컴퓨터를 이용한 해석 시 메쉬전류의 초기값이 일정한 방법으로 찾아지지 않기 때문이다. 본문에서는 노드전압 회로해석 방법을 2번 사용함으로써 레일전위 상승을 해석하는 알고리즘을 제시한다. 또한 알고리즘의 검증하기 위하여 EMTP-RV의 해석결과와 비교 분석하였다.
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정상기(Sang-Gi Chung),정락교(Rag-Kyo Jeong),김백현(Baek-Hyun Kim) 대한전기학회 2011 전기학회논문지 Vol.60 No.1
A PRT vehicle’s control method is presented in this paper. In the asynchronous vehicle control system, vehicles follow their leading vehicles. Leading vehicles are defined differently among the different types of track. The main topic of this paper is to present a method to define the leading vehicle among different types of track and the calculation algorithm of the safety length the following vehicle must maintain. Simulation program is developed using the algorithm and the results of the test run are presented. An asynchronous PRT vehicle control algorithm was presented by Szillat in the paper “A low level PRT Microsimulation, Dissertation, University of Bristol, 2001”. But it is different from the algorithm in this paper. In the algorithm proposed by Markus, vehicles in the merging track are controlled synchronously, and its safety distance between the leading and the following car is evaluated after the establishment of the complicated future time-location table instead of simple equations proposed in this paper.
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