• Proceedings of the Korea Information Processing Society Conference
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• 2004.05a
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• pp.773-776
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• 2004

본 논문에서는 에지 검출기에 의해 다양한 명암이 존재하는 차량 번호판 영역의 사각형 에지를 검출시 사용되는 소벨 및 Prewitt, Roberts, 가우시안의 라플라시안, 그리고 Canny 검출기를 사용하여 처리 속도와 에지 검출의 정확성을 실험하여 각 연산자의 성능을 평가하였다. 기존의 Sobel 에지 검출기는 적응적 임계값을 구하지 않으면 다양한 조명의 영향에 강인하지 못하다. 또한 Canny 에지 검출기는 조명의 영향에 강인하기는 하나, 계산량이 Sobel 보다는 많아 처리 속도가 느리다. 색상에 의해 번호판 후보 영역을 추출한 후 에지 검출기 번호판 내의 명암이 둘 이상으로 차량 번호판 영역에 대해서, 다양한 에지 검출기를 적용하여 속도와 에지 검출 성능을 비교 평가하고자 한다.

• Proceedings of the Korea Information Processing Society Conference
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• 2007.11a
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• pp.47-49
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• 2007

교통정보수집 시스템이란 CCTV나 웹캠을 통해 얻어진 영상을 토대로 차선별, 혹은 주행방향별 교통량과 통과 차량들의 속도를 실시간으로 측정하는 시스템이다. 차선별로 각각 두 개의 라인을 설정하고 이를 이용하여 차선별 속도와 교통량을 측정한다. 이 때 차선별로 설정된 두 라인에 해당하는 영역에 대해서 배경 값을 지속적으로 갱신한다. CCTV와 웹캠을 이용하여 수집한 영상을 실험에 사용한 결과 평균 86.2%의 차선별 주행차량 검지율을 보였으며, 검지된 차량들을 차선별 방향별로 구분하여 평균 속도를 측정하였다.

• The Journal of The Korea Institute of Intelligent Transport Systems
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• v.16 no.2
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• pp.116-127
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• 2017

A fog on road is known as a weather factor that affects traffic flow. The method in order to solve the problem, recently, Variable Speed Limit(VSL) which provide reasonable speed limit by road and weather conditions in real time is introduced. However, if drivers do not comply with VSL, the road safety more decrease than without VSL because individual vehicle's speed deviation is larger than without VSL. Therefore, this paper aims to analyze to speed limit compliance and traffic characteristics under foggy conditions with and without VSL. A test using driving simulator divides into normal and foggy condition with visibilities are 200m, 150, 50~100m. The test results showed that 70 subjects's average speed mostly obeyed speed limit, but speed deviation generally declined with VSL. Especially, the speed deviation more reduced under foggy conditions. According to this study, compliance of VSL clearly rose in low visibility and VSL helped improve road safety due to reduction of speed deviation. The results of this study are expected to make use of reasonable speed limit for reference.

• Journal of Advanced Navigation Technology
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• v.9 no.1
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• pp.10-18
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• 2005

These studies developed system as well as its algorithm which can measure traffic flow and vehicle speed on the highway as well as road by using industrial television(ITV) system. This algorithm used the real time processing of dynamic images. The processing algorithm of dynamic images is developed and proved its validity by frame grabber. Frame grabber can process the information of a small number of sample points only instead of the whole pixel of the images. In the techniques of this algorithm, we made approximate contour of vehicle by allocating sampling points in cross-direction of image, and recognized top of contour of vehicle. Applying these technique, we measured the number of passing vehicles of one lane as well as multilane. Speed of each vehicle is measured by computing the time difference between a pair of sample points on two sample points lines.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.14 no.4
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• pp.165-172
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• 2014

When a vehicle is running on the road, the surface conditions and environment of road by reason of insufficient road design standards is so greatly that have an effect on drivers. In particular, the road design of the past is conducted empirical and ideal judgment, but recently, the new technical development is attempted that three and four dimensional parameters is reconsidering and adjusting at the same time. In this study, we analyzed the vehicle behavior characteristics according to the change of driving speed and vertical grades on braking at the peak point of the frozen road by using a PC-crash program for traffic accident reconstruction. As a result, we were conformed the fact that the friction coefficient of road surface and the vehicle speed is affected by vehicle behavior characteristics for intersection vertical grades and were showed the feasibility of verification through a simulation in order to solve the problem of road design in advance.

• Transactions of the Korean Society of Mechanical Engineers A
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• v.35 no.4
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• pp.341-346
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• 2011

In the development of high-speed trains, ride comfort is an important factor that determines the quality of the train. In this study, the ride comforts of high-speed trains with rigid and flexible car bodies were evaluated. The rail irregularity is used as an exciting source of the car-body bounce motion. The complex extruded structures of the car-body are modeled as shell structures using the calculated equivalent stiffness of the flexible model. The numerical results show that the ride of the rigid-body model improves as the speed increases, which is unreasonable. In contrast, the relationship between ride comfort and speed in the case of flexible-body model is reasonable. Thus, it is confirmed that the flexibility of the car body needs to be taken into consideration while fabricating a high-speed train.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2009.10a
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• pp.773-776
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• 2009

Last of the car industry can be grouped in one-vehicle electronic equipment, the development of the network, and accordingly the communication between each of the network is important. The network currently being used in vehicles include CAN, LIN, MOST, FlexRay, etc. are used. Network of several different kinds of applications using the federation said they were also germ, which causes the driver some more convenient environment, the desire to drive a vehicle that is increasing. If vehicle for other network environments with one integrated environment to make it a gateway for research done actively, the more applications are expected to be developed. In this paper, using gateway between CAN bus used for Body Train-side control of the vehicle network and MOST provided for infotainment systems. In vehicle automatic safety control system will be designed by One of CAN Nodes car speed information sending to MOST Navigation while don't received GPS information in the tunnel.

• ICROS
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• v.19 no.1
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• pp.32-48
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• 2013

최근 보행자와 차량의 항법 정보(위치, 속도, 자세, 방위각, 등)는 기존의 편의(convenience) 목적의 활용뿐 아니라 안전(safety) 보장을 위한 기반 정보로 활용되고 있으며 이에 대한 원천기술 및 활용기술의 연구개발이 활발하게 이루어지고 있다. 본 고에서는 인프라 기반 및 센서 기반의 다양한 보행자/차량용 항법 기술과 항법용 융합 필터 기술을 설명하고 연구사례를 살펴보고자 한다.

• Composites Research
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• v.17 no.4
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• pp.82-86
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• 2004

철도차량에서 복합재료에 대한 활용은 날로 증대되고 있는 추세이다. 현저한 기술적 진보를 얻기 위해 철도차량은 더 가볍고, 강하고, 안전하며 전통적인 소재와는 차별화된 소재를 요구하고 있다. 복합재료의 철도차량에의 응용은 무게 감소, 이로 인한 속도 증가, 에너지 소비량 감소, 낮은 관성, 적은 트랙 마모 그리고 큰 유효 탑재량 등의 장점을 지니고 있으며 철도차량 디자인에 여러 다양함을 제공하고 낮은 무게 중심 설계에 의한 안전성 확보, 단순화된 구조 설계에 의한 좌석수의 증가 등의 장점을 지니고 있다. 또한, 모듈화 설계를 가능케 함으로서 제작공정의 감소 및 유지보수 효율화를 얻을 수 있게 된다. (중략)

• Journal of Broadcast Engineering
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• v.22 no.4
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• pp.448-461
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• 2017

This paper proposes a vehicle counting and speed estimation method for traffic situation analysis in road CCTV videos. The proposed method removes a distortion in the images using Inverse perspective Mapping, and obtains specific region for vehicle counting and speed estimation using lane detection algorithm. Then, we can obtain vehicle counting and speed estimation results from using optical flow at specific region. The proposed method achieves stable accuracy of 88.94% from several CCTV images by regional groups and it totally applied at 106,993 frames, about 3 hours video.