• 건축역사연구
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• 제25권2호
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• pp.7-19
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• 2016

Shenyang was one of the representative transportation hub of Northeast China during the modern period. The formation and development of the railway network gave great influence on Shenyang's city development. In order to understand the relationship between railway and city development, first, we classified Shenyang's city development period by the railway network's formation and expansion process. Then, we analyzed the relationship between railway and city space by five categories. The results of this study are as follows. First, before railway was constructed, Shenyang was a castle city, which also was the economic center of Northeast China. This was the main reason Shenyang was chosen as a railway zone. During the modern period, the castle structure became an obstacle to city transportation and environment, therefore, it was disposed. During the period of railways' expansion, South Manchuria, Jingfeng and Shenhai railway line was constructed in Shenyang. Since each line had different operation organizations, city sites along the railways were planned separately. However, these operation organizations had one common purpose, which was to use railway as an accelerator for economic development. During the period of railway's military usage, railway was reorganized as military supply transport for the Japanese, which also was used as a tool for the expansion of colonialism. Second, after Shenyang's city space was reconstructed along the railway, it created a close connection with city structure, city facilities, landscape and city transportation system. Hence, the railway system played a key role in modern city planning.

• Journal of information and communication convergence engineering
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• 제18권1호
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• pp.28-32
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• 2020

Railway transportation is the main land-based transportation in most countries. Accordingly, railway-transportation safety has always been a key issue for many researchers. Railway pedestrian accidents are the main reasons of railway-transportation casualties. In this study, we conduct experiments to determine which of the latest convolutional neural network models and algorithms are appropriate to build pedestrian railroad accident prevention systems. When a drone cruises over a pre-specified path and altitude, the real-time status around the rail is recorded, following which the image information is transmitted back to the server in time. Subsequently, the images are analyzed to determine whether pedestrians are present around the railroads, and a speed-deceleration order is immediately sent to the train driver, resulting in a reduction of the instances of pedestrian railroad accidents. This is the first part of an envisioned drone-based intelligent security system. This system can effectively address the problem of insufficient manual police force.

• 전기학회논문지
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• 제63권1호
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• pp.184-190
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• 2014

Fuel cell power system, unlike conventional energy sources, converts chemical energy into electrical energy through electrochemical reaction of hydrogen and oxygen. In recent years, railway field as well as mobile fuel cell power system is being studying actively with development of hydrogen storage technologies. This paper presents the feasibility study on small-scale prototype electric railway vehicle application using fuel cell generation system. it is confirmed that proposed fuelcell-battery hybrid system shows good response characteristic about speed and torque based on design of parameter on system. Also as results of response for proposed system modeling, it show that powering mode and braking mode of system is controlled by switching devices of converters.

• International Journal of Railway
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• 제9권1호
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• pp.1-9
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• 2016

In order to achieve a comprehensive utilization of railway networks, it is necessary to accurately assess the timetable indicators that effect the train operation. This paper describes the parameter calibration for two timetable indicators: scheduled running time and scheduled dwell time. For the scheduled running time, an existing model is employed and the single timetable parameter (percentage of minimum running time) in that model is optimized. For the scheduled dwell time, two intrinsic characteristics: the significance of stations and the average headway at each station are proposed firstly to form a new model, and the corresponding timetable parameters (the weight of the significance and the weight of the average headway) are calibrated subsequently. The Floyd Algorithm is used to obtain the connectivity among stations, which represents the significance of the stations. A case study is conducted in a light rail transportation system with 17 underground stations. The results of this research show that the optimal value of the scheduled running time parameter can be automatically determined, and the proposed model for the scheduled dwell time works well with a high coefficient of determination and low relative root mean square error through the leave-one-out validation.

• 한국산학기술학회논문지
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• 제13권12호
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• pp.5669-5675
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• 2012

이종궤간(표준줴/광궤)이 존재하는 유라시아 철도네트워크(TKR, TCR 및 TSR)의 화물운송시간 및 비용을 절감하기 위해서는 이 구간을 자유롭게 운행할 수 있는 궤간가변 윤축시스템의 개발이 중요하다. 국내에서는 기존 해외 윤축시스템을 보완하고자 새로운 한국형 궤간가변 윤축시스템을 개발 및 제작중이다. 본 연구에서는 안전-수명설계관점에서 강도와 내구성해석을 수행하였다. 본 시스템의 내구성해석결과로서, 주요부품은 $1{\times}10^7$ 사이클까지 안전하였다. 또한, 주행중 안전성을 확인하기위하여 국제철도규정 UIC에 따라 리그피로시험을 수행하였다. 이 시험을 통하여 본 궤간가변 윤축시스템은 관련 안전규정에 만족함을 확인하였다.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2009년도 춘계학술대회 논문집
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• pp.966-971
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• 2009

The recent environmental protection trend requires more strict energy saving, therefore every transportation system should reduce energy consumption to the minimum value. High-efficiency operation system, energy saving and CO2 emissions shall be addressed as important issue in railway system. These issues are the most essential factors of railway, compared to major public transportation system. Recently, saving energy in the electric railway system has been studied. For such new energy saving, the Energy storage system is considered for saving energy. Energy saving is possible by efficient use of regenerated energy. Regenerated energy is recycled amongst vehicles by mean of charge and discharge corresponding to powering and braking of electric vehicle operations. This energy saving contributes to cut CO2 to reduce greenhouse gas emissions. Recycling regenerated energy demonstrate significant effect on peak cut of consumption energy in railway substation. Absorption of excess energy avoids regeneration failure due to high traction voltage. This paper presents effects by applying the energy storage system to SeoulMetro Line 2.

• 전기학회논문지
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• 제64권2호
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• pp.342-348
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• 2015

In this paper, fuel cell power generation system that is being studied in recent railway field was applied to compensate for the voltage drop due to the load as driving electric vehicle. PSIM simulation program is to be used to implement the modeling of the electric railway for AC AT feeder system. For it, It was applied to the product-type single-phase PLL algorithm, step-down converter is controlled as power so as to have the fuelcell generation system. Based on it's result, a reactive power due to the catenary impedance in accordance with the current flowing is compensated as linked with fuelcell generation system which supplied the current to the power supply grid. and then its performance was confirmed that voltage compensation effect obtained at SubStation (SS), SubSectioning Post (SSP), Sectioning Post (SP).

• 전기학회논문지
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• 제62권10호
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• pp.1470-1474
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• 2013

In this paper, proper length of neutral section and neutral section system configuration is proposed to minimize accidents if ATO urban railway vehicle stops maintaining the leading vehicles in air section at regular intervals. When considering the minimum voltage sensing of power conversion unit in the urban railway vehicle, the effective length of 14,280[mm] with neutral section can be minimized damage due to high current because the urban railway vehicle is very little present chance compare neutral section with pantograph interval installed on a unit vehicle. In addition, uplift of catenary line and contact wire consider to minimize damage. The result of theoretical review, as the proposed neutral section shorter, isolated neutral section is effective than the integrated neutral section.

• 한국안전학회지
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• 제25권5호
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• pp.33-38
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• 2010

Railway is one of popular transportation systems. Due to the safety and in time, the transportation by train is preferred to the others for a long time. However, accidents under railway construction get more serious problems than in case of the other system, because it is the largest mass transportation system. Especially, the railway construction is composed of different kinds of construction works such as civil, architect, electric and mechanic. It is closely/complicatedly connected with various workers, large machines and facilities, regulations etc. In this study the data on safety accidents are corrected during 6 years(2004~2009) and analyzed by time(year, month, week, day, a.m or p.m), place, field, type etc. Results shows that there exists remakable trends on accidents, so efficient treatments should be prepared considering this trend.

• 한국철도학회:학술대회논문집
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• 한국철도학회 2000년도 춘계학술대회 논문집
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• pp.32-42
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• 2000

In this paper, we outlines the basic pricing rules that developed over the years, and illustrates how these rules apply in practice using railway fare, price discrimination in railway travel. we review the problems of rail fare system reflecting the market fare decision and consider fare decision structure and relative fare comparison with other modes of transportation. Specifically, we focus on tile effect of tile “fare varying system with distance”, using the characteristics of long distance transportation modes. And set up the framework for reasonable fare decision under the current circumstances.