• Proceedings of the Korea Information Processing Society Conference
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• 2021.11a
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• pp.181-184
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• 2021

자율주행 기술이 고도화됨에 따라 사용자가 주행 상황을 실시간으로 모니터링하고 주행을 제어할 수 있는 자율주행 서비스가 필요하다고 생각했다. 또한, 돌발 장애물을 고려하며 정해진 경로로 주행하는 자율주행을 구현하고자 해당 시스템을 설계하게 되었다. 해당 시스템은 차량, 서버, 애플리케이션으로 구성되어있으며 구성요소 간의 실시간 통신을 통해 차량 주행 상황 및 사용자 제어 명령을 자유롭게 전달하고자 했다. 차량의 자율주행 알고리즘을 구현하기 위해 이미지 데이터 처리에 효과적인 CNN을 활용하여 장애물 회피 모델과 라인 트레이서 모델을 구현하여 해당 모델들을 하나의 솔루션으로 통합하였다. 해당 솔루션 구현을 통해 차량이 마주할 수 있는 돌발 상황에 대처하는 자율주행의 안전성을 높이고자 했으며 자율주행 환경에서 사용자 조작을 용이하게 하고자 하였다.

• Proceedings of the Korea Information Processing Society Conference
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• 2023.11a
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• pp.170-172
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• 2023

최근 자동차는 자율주행차 혹은 스마트카로 진화하며 다양한 외부 통신 인터페이스를 포함하고 있습니다. 각 기능 통제를 위해 차량 소프트웨어의 복잡성과 자동차 기술 발전에 따라 통신 인터페이스의 증가로 인하여 자동차에 대한 사이버 공격 가능성 및 위험성이 꾸준히 증가하고 있습니다. 특히, 커넥티드카의 안전을 위한 V2X(Vehicle to Everything)통신이 보안 취약점을 가질 경우, 이는 탑승자의 생명에 직접적인 위협을 초래할 수 있습니다. 그러나, 지능형 교통 시스템에서는 익명성을 위해 일정 시간이 지나면 차량의 식별정보를 변경해 공격자를 찾는데 어려움이 있다. 따라서 본 논문에서는 지능형 교통 시스템 내에서 이상행위를 유발하는 차량을 탐지하기 위해 V2X에 활용되는 표준 메시지 정보를 통해 식별하여 추적하는 기술을 제안하고자 한다.

• Journal of the Korean Society of Safety
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• v.34 no.5
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• pp.139-143
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• 2019

In this study, we tried to derive the most severe scenario and its critical speed by 1-D collision simulation with a variable formation vehicle in order to prepare for the change of demand in Seoul Metropolitan Subway Line 3, which is operated by fixed arrangement. After establishing various collision scenario conditions, the friction coefficient between the wheel and the rail was evaluated as 0.3, which is considered to be severe. As a result of analysis according to all scenarios, the most severe scenario conditions were confirmed by comparing rubber shock absorber performance and vehicle collision deceleration. In addition, a typical wheel-rail friction coefficient was derived through accident cases, and the analysis was performed again and compared. Finally, the criterion of the critical speed in the condition of the friction coefficient of the normal wheel - rail condition was confirmed.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.13 no.11
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• pp.5558-5565
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• 2012

Roadside barriers are facility for preventing cars from out of path, and 7 classes of barrier are prescribed in criteria of road grades and speed limit, etc. However, overload and overspeed are increased according to improvement of vehicle performance, and falling over frequently occur in vehicle accident related in barriers. Therefore, enhancement of the existing design criteria of roadside barriers is demanded. In this research, vehicle crash simulation was carried out, and the condition for fracture of roadside barriers and vehicle overturn was evaluated in order to verify the defence performance of the barriers, which are SB5 steel barrier and SB6 concrete barrier adapted mainly to highway.

• Journal of the Korea Convergence Society
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• v.11 no.11
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• pp.47-53
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• 2020

There is a need for a system that provides early warning of presence and type of failure of automobile wheel bearings through the application of predictive fault analysis technologies. In this paper, we presented a sensor module mounted on a wheel bearing and a diagnostic system that collects, stores and analyzes vehicle acceleration information and vibration information from the sensor module. The developed sensor module and predictive analysis system was tested and evaluated thorough excitation test equipment and real automotive vehicle to prove the effectiveness.

• Journal of the Computational Structural Engineering Institute of Korea
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• v.24 no.4
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• pp.399-404
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• 2011

Overload vehicles have demoralizing influence upon the social overhead capital, economics of nation, traffic flow and road safe as various components. Accordingly, this study established a ubiquitous sensor network system to develop an intelligent regulation system to monitor overloaded vehicles in motion. and Unlike WIM, after detecting the axle of driving vehicles by measuring deformation of roads, this system calculates the weights of vehicles by using signals from the strain sensors installed under the road and an analysis method. Also the study conducted an simulation test for vehicle load analysis using genetic algorithm. and tested wireless sensor for USN system.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2008.08a
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• pp.95-98
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• 2008

The vehicle has many technique change from The requirement of the safety the energy environment and convenience dimension is an enlargement toe. This is keeping changing the paradigm of the vehicle industry rapidly. The change to be technical such brought the intelligence of the former control device. And this organizes a sensor network among each systems and makes new traffic system. This paper a standard framework based on Sensor. We call it Vehicle Management System. The VMS used MOST network and It is able to make the stability of the component swap time or vehicle order the greatest.

• Journal of IKEEE
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• v.24 no.4
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• pp.1017-1021
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• 2020

In the V2X communications, each vehicle periodically broadcasts a message, called a beacon, so that its neighbor vehicles can accurately predict the near-future positions of the sending vehicle. In particular, the mobility-adaptive beacon broadcast (MAB2) scheme keeps the tracking error of a sending vehicle below a fixed threshold within a few consecutive beacon losses. In this paper, we present a random-early beacon broadcast (REB2) scheme that addresses the beacon aging problem of the MAB2 scheme. The simulation results show that, for a neighbor vehicle within 100 m distance, the tracking failure probability of REB2 scheme can be reduced to less than 1/10 of that of MAB2 scheme.

• Proceedings of the Korea Information Processing Society Conference
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• 2020.11a
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• pp.870-872
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• 2020

본 시스템은 어린이보호구역에 발생하는 차량사고가 불법주정차된 차량으로 인한 사각지대에 의해 발생되는 것에 착안하여 보행자를 인식하여 운전자들에게 알려 안전운전을 유도하여 사고를 예방해 주는 시스템이다 본 시스템은 영상인식장치, 경광장치, 중계장치, 차량 내 경고장치, 원격 트래픽 경고 수신기로 구성되어 있으며 영상인식장치가 edge-TPU 장치를 활용하여 카메라로부터 입력받은 영상을 모바일넷 기반의 딥러닝으로 처리하여 보행자, 차량, 그밖의 물체를 인식한다. 보행자가 인식되면 외부에서 경광장치가 발광하여 신호를 보내고, 중계장치를 통해 차량 내 경고장치로 보행자 경고 신호를 보낸다. 실험 결과 영상인식을 통해 보행자와 차량을 분류 인식할 수 있음을 확인하였다. 이러한 시스템은 어린이 보호구역에서 발생할 수 있는 교통사고를 방지하기 위해 효과적임을 확인할 수 있었다.

• Journal of Korean Society of Transportation
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• v.21 no.1
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• pp.115-125
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• 2003

The concrete median barriers are the most popular safety appurtenance that can be installed on narrow medians and are effective in keeping uncontrolled vehicles from crossing into opposing lanes of traffic. It is necessary to install and maintain median barriers because it is very difficult to reserve enough room required for medians in KOREA. Also, concrete median barriers are accepted as the actual alternatives for median barriers, mostly because they require almost no maintenance even after serious collisions. Typical concrete median barriers are 810mm high and have 596mm high glare screens on top of them. However we have experienced a number of "climb" and "roll-over" accidents of heavy vehicles and most of all, there have been some serious accidents caused by the part of broken glare screens. So the improvement study of concrete median barriers started. Prior to this study, a new type of concrete median barrier was suggested which is 1,270mm high and has no glare screens on top of it. So it was required to compare the properties of various types of concrete median barriers including the new type to find the optimal type of concrete median barrier. In this study, we have evaluated the characteristics of four types of concrete median barriers (New Jersey type, F type, constant slope type, and wall type). We have performed many computer simulations for the evaluation of the crashworthiness of them, and through the simulations we have tried to find a proper type of concrete median barrier. Through the computer simulations, we evaluated the structural stability and safety of the four types of concrete median barriers. We confirmed the structural stability and safety of them But in regard to the probability of "roll-over" of heavy vehicles, the higher concrete median barriers showed better performances than the lower. As the result of this study a new type of concrete median barrier was recommended.