• The Journal of The Korea Institute of Intelligent Transport Systems
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• v.19 no.6
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• pp.74-87
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• 2020

Overloaded trucks are the main source that threatens road safety and directly affects the reduction of pavement life. The On-board truck scale is the only equipment that could prevent overloading by measuring and adjusting the loading weight before driving. Legislation is needed to encourage its installation so that the driver can prevent overloading. In this study, an on-board truck scale system was installed on 30 dump trucks for transporting construction waste, such as soil and aggregates, which are major loads of 36.55% for overloading, and the trucks were monitored remotely. The overload prevention effect was analyzed by comparing driving data for 1 month before distribution of the weight display app that can recognize the weight to the driver and 1 month after distribution. After installation, overloading could be 6.1% reduced, and the transportation efficiency could be increased by checking the weight provided from the On-board truck scale system.

• Proceedings of the Korea Information Processing Society Conference
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• 2017.11a
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• pp.1061-1064
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• 2017

자전거 이용자 수가 천만 명을 넘으면서, 자전거 사업은 우리의 삶에 중요 요소로 자리 잡게 되었다. 본 연구에서는 자전거 사용자들에게 편의를 제공하기 위해 GPS정보를 기반으로 한 자전거 전용 네비게이션과 사용자들을 자전거 사고로부터 보호할 수 있는 사고 대처 시스템을 개발하였다. 이를 위해 우리는 아두이노기반의 시스템을 토대로 개발되었으며 스마트폰과 블루투스 송신기술을 사용하여 다양한 정보를 주고 받을 수 있도록 설계하였다. 우리의 사고 대처시스템은 실시간으로 자전거 운행 정보를 공유하도록 하여 보다 효율적으로 자전거 사고를 예방 할 수 있도록 하는데 그 목적이 있다. 이를 위해 우리의 시스템은 아두이노를 통해 측정한 센서 값들을 스마트폰을 통해 자전거 사용자들에게 실시간으로 공유되도록 하고 이를 통해 다른 자전거 사용자들이 자전거 도로의 상태, 사고 내용들을 파악하도록 하여 안전하고 편리한 자전거 운행이 가능하도록 하여 향후 자전거 사업이 발전시킬 수 있는 계기를 마련할 것으로 기대한다.

• Transactions of the Korean Society of Mechanical Engineers B
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• v.41 no.11
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• pp.775-784
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• 2017

The purpose of this study was to analyse the basic data of the engine tuning inspection by confirming the working possibility of effective engine tuning and identifying the characteristics of tuned engine that are no problem with the safety operation and environment in a driving gasoline car. The effects of tuned engine on the characteristics of air/fuel ratio and performance at a wide range of engine speeds were experimentally investigated by the actual driving car with a four-cycle, four-cylinder DOHC, turbo-intercooler, water-cooled gasoline engine operating under four types of non-tuning, and tuning 2-1, 2-2 and 2-3. The tuned parts of engine in a driving gasoline car include the intake manifold, intake pipe, air filter, exhaust manifold, exhaust pipe and silencer. In this experiment, the air-fuel ratio and torque of both non-tuned and tuned engines that one person took on board in the car with a five-speed automatic transmission were measured by the chassis dynamometer(Dynojet 224xLC). It was found that the maximum torque of tuned engine in a driving gasoline car was increased by 103.68% on average, while the maximum output was increased by 119.68% on average in comparison to the non-tuned engine.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.21 no.5
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• pp.103-111
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• 2021

The purpose of this study is to study a method for preventing collisions of multiple drones in controlled airspace. As a result of the study, it was proved that it is appropriate as a method to control drone collisions after setting accurate information on the ROI (Region of Interest) area estimated based on the expected drone path and time in the control system as a method to avoid drone collision. As a result of the empirical analysis, the diameter of the flight path of the operating drone should be selected to reduce the risk of collision, and the change in the departure time and operating speed of the operating drone did not act as an influencing factor in the collision. In addition, it has been demonstrated that providing flight priority is one of the appropriate methods as a countermeasure to avoid collisions. For collision avoidance methods, not only drone sensor-based collision avoidance, but also collision avoidance can be doubled by monitoring and predicting collisions in the control system and performing real-time control. This study is meaningful in that it provided an idea for a method for preventing collisions of multiple drones in controlled airspace and conducted practical tests. This helps to solve the problem of collisions that occur when multiple drones of different types are operating based on the control system. This study will contribute to the development of related industries by preventing accidents caused by drone collisions and providing a safe drone operation environment.

• The Journal of The Korea Institute of Intelligent Transport Systems
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• v.13 no.2
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• pp.57-67
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• 2014

In the last decade, various situations were simulated through virtual environment due to rapid improvement of computer capability and technology. Transportation engineering also has adopted the virtual environment facility in order to identify drivers behaviour under various circumstances. This study aims to evaluate driver reactions to the introduction of new ITS interventions at railway crossings (RLX) in driving simulator. Three ITS safety devices were used to figure out how drivers reacted to them. In addition, a survey was conducted to find participants' work load and acceptance of the technology. The ultimate purpose of this paper is to evaluate ITS safety devices in various aspects. Each participant made 3 runs (2 baselines, 1 ITS randomly) for approximately 20 minutes each. The participants answered that current railway crossings did not look safe prior to experiment. They responded that the use of ITS technologies were easy and the technologies were more effective on passive railway crossings.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.24 no.6
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• pp.138-146
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• 2010

DC railway power supply system generally uses the running rails as negative-polarity return conductor for traction load current, and the induced rail potential and stay current cause serious problems to any electrified matter in the underground and also safety problems to human body. This paper presents a new algorithm for the analysis of the rail potential and the stray current in DC railway power system operated under independent/parallel power feeding mode. The effect of load current fluctuation during train operation is also calculated by using TPS(Train Performance Simulation) program to analysis the variation of the railway potential and stray current along railway track. Simulation program is developed based on the proposed algorithm and case studies are provided.

• Proceedings of the KIEE Conference
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• 2007.07a
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• pp.2082-2083
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• 2007

고속철도 운행, 도시철도 고밀도화, 무인자동운전의 경량전철 등 신교통시스템 도입 등 급변하는 철도환경에 따른 철도안전의 위험요인이 증가하고 있다. 국내 철도사고 사망자는 설비개량, 노후차량교체, 건널목입체화로 감소하고 있으나 10년을 주기로 대형참사가 발생하고 있으며, 철도관련 종사자의 안전의식이 낮은 수준이다. 이러한 대형참사의 발생을 방지하기 위하여 철도안전법이 제정되고 이의 효율적인 시행기반을 구축하기 위하여 철도시설안전체계 구축 및 기술분야별 안전기준을 개발하고 있다. 본 논문에서는 철도종합기술개발사업의 철도사고 위험요인분석(PHA : Preliminary Hazard Analysis)을 토대로 관계있는 위험원을 선정하였다. 또한 위험원에 의한 사고발생을 예방하기 위한 철도신호분야의 안전기준항목을 기술하였다.

• Electronics and Telecommunications Trends
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• v.18 no.1 s.79
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• pp.33-41
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• 2003

차량용 레이더란 지능형 교통시스템의 여러 가지 구현 목표 가운데 차량의 안전 운행과 관련된 부분으로 열악한 기상조건 또는 운전자의 부주의로 인해 발생 가능한 사고를 미연에 방지할 목적으로 개발된 시스템이다. 본 고에서는 이러한 차량용 레이더에 요구되는 여러 가지 기술적인 사항들과 세계적인 업계의 동향 그리고 나아가 국내의 기술기준에서 고려해야 할 사항들에 관하여 개괄적으로 살펴보았다.

• Proceedings of the KIEE Conference
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• 2001.04a
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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.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.11 no.2
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• pp.469-475
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• 2010

The railway signalling system plays an essential role in the safe and efficient train operation as serving control functions of train operation intervals and train routes. The reliability and safety of the system are very important because the failure of the railway signalling system can lead to train collision or derailment as well as train operation stop. Until now, in railway signalling system the conventional wayside signal mode has been used generally. There are, however, the risk of accidents such as human mistakes caused by that the driver identifies the signal lamp status and controls train speed with the naked eye. It is also necessary to refurbish the obsolete system. Thereby, It is being effective that the onboard signal mode has been recently introduced and applied in order to transmit the speed control information to train by using the computer and communication equipment. It is necessary to switch over the system in a way while providing passengers with an operation service to replace the obsolete signal system. In this paper, we verify the cases through trial assessment which are solved by the way of adding specific functionalities in the problems of interference among the procedure of switch-over processes and a serial of processes for system verification while a train is operated in the new system in parallel to the existing system.