• Journal of Welding and Joining
• /
• v.19 no.6
• /
• pp.652-657
• /
• 2001

To analyze and predict crack initiation position and propagation directions on the spot welded area are very important for strength design of the automobile body structure. It is necessary to test by method considering random loads with variable amplitude for strength design of vehicle body structure, because driving cars are actually subjected to random loads with variable amplitude in the road. Although this condition, nearly all tests haute been performed under constant load conditions in the laboratory because it is impossible to replay like an actual conditions. In this study, using in-plane bending type specimens, the overload factor affecting on the fatigue strength, crack initiation and propagation directions of spot-welded specimens have been studied.

• Journal of Institute of Control, Robotics and Systems
• /
• v.19 no.6
• /
• pp.534-539
• /
• 2013

Recently, the number of vehicles equipped with cameras that are generally used to recognize surroundings is increasing. For robust recognition, a huge amount of tests under various environments are performed. Furthermore, the installation position or orientation of the camera is also changed depending on the vehicle. This change also accompanies many tests. Correspondingly, a large cost and a great deal of manpower are required to perform these tests. This paper proposes a method to cut these costs while conducting enough tests through the construction of a database of videos and a geometric transformation of images.

• Proceedings of the KIEE Conference
• /
• 2007.04a
• /
• pp.401-403
• /
• 2007

This paper present the Traffic information system that based on embedded WinCE board which has GPSand HSDPA. This system is able to overcome the limit of area using the Internet service other system can't provide. When the embedded board receives the data which has geometric and vehicle speed information, it transmits the data to server via HSDPN/the Internet. The server receives and processes the data for the path services. By an algorithm the data that road information is applied is provided to user. The users will be able to arrive there destination faster.

• Proceedings of the KIEE Conference
• /
• 2015.07a
• /
• pp.22-23
• /
• 2015

As wireless power transfer (WPT) technology using strongly coupled electromagnetic resonators is a recently explored technique to realize the large power delivery and storage without any cable or wire, this technique is required for diffusion of electric vehicles (EVs) since it makes possible a convenient charging system. Typically, since the normal conducting coils are used as a transmitting coil in the CPT system, there is limited to deliver the large power promptly in the contactless EV charging system. From this reason, we proposed the combination CPT technology with HTS transmitting antenna, In this study, we examined the improvement of transmission efficiency and properties for HTS and copper antennas, respectively, at 30 cm distance. Thus, we obtained improved transfer efficiency with HTS antenna over 10% compared with copper antenna

• Journal of the Korea Institute of Military Science and Technology
• /
• v.20 no.3
• /
• pp.362-368
• /
• 2017

The endurance test is important to evaluate and predict defects of the vehicles. In particular, in order to improve the reliability of the endurance test for the powertrain system of military vehicles, the driving load is measured and analyzed at test courses and maneuvering roads. As a result, new test courses for powertrain system is additionally needed to improve test reliability. In this paper, it shows that new test courses for powertrain system is designed and constructed using the measuring and anlayzing result between CPG test courses and army maneuvering roads.

• Proceedings of the Korean Information Science Society Conference
• /
• 2010.06d
• /
• pp.328-331
• /
• 2010

본 논문에서는 도시 기반의 VANET 환경에서 차량간의 안정적인 통신을 위한 차량 밀도를 이용한 라우팅 기법을 제안한다. 제안하는 라우팅 기법에서 차량들은 비콘 메시지와 도로 정보 테이블을 이용하여 자신이 속해있는 도로의 차량 밀도를 계산하고 있다. 소스 차량은 이 정보를 이용하여 안정적인 경로를 탐색하고 설정된 경로를 통해 패킷을 보낸다. 제안하는 기법을 평가하기 위해 NS-2를 이용하여 GPSR과 비교 실험을 하였고, 그 결과 GPSR보다 우수한 성능 결과를 보였다.

• Proceedings of the Korean Information Science Society Conference
• /
• 1998.10c
• /
• pp.497-499
• /
• 1998

비젼 시스템을 바탕으로 한 무인 주행 시스템은 카메라로부터 입력된 영사에서 도로와 비 도로를 적절히 인식하여 그것을 바탕으로 주행을 위한 여러 장치들을 제어하는 시스템이라 할 수 있다. 한편 이와 같이 영상의 인식 결과가 핸들 제어나 속도 제어의 성능을 결정할 때 무엇보다 도로의 환경 변화에 강건한 비젼 시스템의 구현이 요구된다. 본 논문에서는 비젼 시스템과 핸들 제어 시스템 두 부분을 구현하였는데, 비젼 시스템에서는 입력 영상에 대해 학습이 가능한 Multilayer Perceptron(MLP)을 이용하여 도로와 비 도로를 적절한 신뢰도로 나눈 후 피라미드 알고리즘을 거쳐 최종 도로 영역을 추출해 낸다. 핸들 제어를 위해 도로 영역의 외곽선을 모델링한 후 차량의 주행 방향 벡터를 구한다. 그 값이 핸들 제어 시스템에서의 MLP의 입력이 되어 차량의 핸들 각도를 결정하게 된다. 끝으로 옥외 차량 시뮬레이션을 통하여 본 논문에서 제안된 알고리즘의 유용성을 확인한다.

• Journal of Institute of Control, Robotics and Systems
• /
• v.12 no.10
• /
• pp.975-981
• /
• 2006

This paper shows a feasibility analysis results on RFID for car positioning system. Usually, a car navigation is mainly based on GPS combined with map-matching. However, in the case of poor visibility of satellites, GPS can not supply accurate position information continuously. In recent years, RFID has been considered to be one of key technologies in positioning and localization area. But its application and research results in the area of vehicular positioning are not popular. RFID system consists of tag, reader, antenna and software such as drivers and middleware. The main function of RFID system in a vehicular positioning is to retrieve ID recorded position information from tags which set on the center of road. We propose a positioning method for vehicles using RFID and we present some indoor and outdoor experiment results to show that the proposed method is available in vehicle operational environments.

• Journal of Power System Engineering
• /
• v.6 no.2
• /
• pp.73-81
• /
• 2002

In this study, electronically controlled automatic transmission adopted on a subcompact model in the market was modelled, and the driving performances of the transmission were simulated with the models. Kinetic and dynamic models of working components are established. The driving simulation program is developed with those models, and the various driving conditions are analyzed. With the results, the dynamic behaviour of the engine and the automatic transmission is easily understood. Especially, the transient performances of torque converter and clutches are deeply analyzed. Skipping the vehicle road test by using this analyzing tool, we can expect the cost down and the reduction of the development period of automatic transmission.

• Journal of Power System Engineering
• /
• v.3 no.3
• /
• pp.91-96
• /
• 1999

This study is about the design and analysis ot a suspension damper for truck driver's seat to improve the ride comfort. Trucks are usually subjected to hostile driving environments. Therefore, many truck driver's seat have suspension seats to isolate the vibration from the cab floor panel. Because the vehicle suspension system can reduce the primary vibration from the ground, only low frequency vibration can be transmitted to the driver's seat. But, this low frequency vibration can be harmful to the driver. The seat damper is very critical element to improve the ride comfort for the driver. In this study, a four-stage damper is designed and analyzed for the vibration capability. The damping coefficient of this damper can lie manually controlled in response to the road and driving environment.