• Journal of Communications and Networks
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• 제15권2호
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• pp.173-178
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• 2013

It is a concern that eco-driving vehicles, because their driving behavior differs from other vehicles due to e.g. e-start, may inhibit smooth traffic flow. Therefore, it is necessary to study the cooperative eco-driving done by a vehicle group, putting "vehicle-to-vehicle communication" and "road-to-vehicle communication" into perspective. Based on these factors, this study aimed to: 1) Analyze fuel consumption rates and driving behaviors of more than one vehicle following an Eco-Driving vehicle. 2) Examine the effect of information on the fuel consumption rate of the preceding vehicles on the following vehicles. As a result, the following findings were obtained: 1) By providing information to multiple following vehicles, the fuel consumption rate of the second vehicle was not lowered, while that of the third one was. 2) It is possible that, when information on fuel consumption of a preceding vehicle is provided to the following one, an inter-vehicular distance is shortened during deceleration to contribute to smooth traffic flow. From the above results, it is suggested that, when targeting a vehicle group, sharing the information on preceding vehicles is effective.

• 한국자동차공학회논문집
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• 제10권4호
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• pp.175-180
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• 2002

In order to satisfy the requirements of time reduction and cost saving for development of electronic control systems(ECU) in automotive industry, the applications of a standardized real-time operating system(RTOS) and a communication protocol to ECUs are increased. In this study, a body control module(BCM) that employs OSEK/VDX(open system and corresponding interfaces for automotive electronics/vehicle distributed executive) OS tour the RTOS and a controller area network(CAN) fur the communication protocol is designed, and the performances of the system are evaluated. The BCM controls doors, mirrors, and windows of the vehicle through the in-vehicle network. To identify all the transmitted and received control messages, a PC connected with the CAN communication protocol behaves as a CAN bus emulator. The control system based upon in-vehicle network improves the system stability and reduces the number of wiring harness. Furthermore it is easy to maintain and simple to add new features because the system is designed based on the standards of RTOS and communication protocol.

• 한국인터넷방송통신학회논문지
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• 제20권3호
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• pp.83-88
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• 2020

최근 자동차는 관련 기술과 통신 환경의 발달로 차량과 도로 주변 인프라 구조와의 통신, 차량 간 통신이 가능해지고 있다. 자율주행차가 개발되면서 많은 센서와 고성능 연산장치가 탑재되고 있으며 이러한 자동차의 가용자원을 활용하여 클라우드 서비스를 제공하는 연구도 진행되고 있다. 본 논문에서는 연결형 자동차로 클라우드 서버를 구성하여 각 차량에 적합한 작업을 분배하는 과정에서 차량의 가용자원뿐만 아니라 기지국과의 통신 환경을 고려하여 동적으로 작업의 크기를 결정하는 기법을 제안하였다. 제안 기법의 모델을 기반으로 시뮬레이션한 결과 가용자원만을 고려하는 것보다는 통신 환경을 함께 고려해서 작업을 할당해야 마감 시간 내에 할당된 작업을 완료할 수 있다는 것을 확인하였다.

• KSII Transactions on Internet and Information Systems (TIIS)
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• 제13권6호
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• pp.2838-2858
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• 2019

Traditional channel models for vehicle-to-vehicle (V2V) communication usually assume fixed velocity in static scattering environment. In the realistic scenarios, however, time-variant velocity for V2V results in non-stationary statistical properties of wireless channels. Dynamic scatterers with random velocities and directions have been always utilized to depict the non-stationary statistical properties of the channel. In this paper, a non-stationary geometry-based cooperative scattering channel model is proposed for multiple-input multiple-output (MIMO) V2V communication systems, where a birth-death process is used to capture the appearance and disappearance dynamic properties of moving scatterers that reflect the time-variant time correlation and Doppler spectrum characteristics. Moreover, our model has more straight and concise to study the impact of the vehicular traffic density on channel characteristics and thus avoid complicated procedure in deriving the analytical expressions of the channel parameters and functions. The numerical results validate our analysis and demonstrate that setting important parameters of our model can appropriately build up more purposeful measurement campaigns in the future.

• 한국자동차공학회논문집
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• 제22권6호
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• pp.14-22
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• 2014

An autonomous vehicle requires a technology of generating maps by recognizing surrounding environment. The recognition of the vehicle's environment can be achieved by using distance information from a 2D laser scanner and color information from a camera. Such sensor information is used to generate 2D or 3D maps. A 2D map is used mostly for generating routs, because it contains information only about a section. In contrast, a 3D map involves height values also, and therefore can be used not only for generating routs but also for finding out vehicle accessible space. Nevertheless, an autonomous vehicle using 3D maps has difficulty in recognizing environment in real time. Accordingly, this paper proposes the technology for generating 2D maps that guarantee real-time recognition. The proposed technology uses only the color information obtained by removing height values from 3D maps generated based on the fusion of 2D laser scanner and camera data.

• 한국정보통신학회:학술대회논문집
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• 한국해양정보통신학회 2009년도 추계학술대회
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• pp.219-222
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• 2009

최근 자동차산업과 통신 기술이 발전함에 따라 ITS(Intelligent Transportation System)의 핵심인 차량내 네트워크(In Vehicle network) 기술이 대두되고 있다. 그러나 현재 제공되고 있는 차량 내 네트워크 기술은 하나의 네트워크로 이루어 진 것이 아니라, 통신 속도와 비용 및 효율성 측면을 고려하여 필요에 따라서 다르게 구성이 되어 상용화 되어 있다. 따라서 차량 네트워크 통신 및 설계의 복잡성이 증대 되었고 이를 연동할 수 있는 프레임 워크가 요구되어진다. 따라서 본 논문에서는 차내망 이기종 네트워크간의 연동을 위한 프레임워크를 설계하였다.

• 한국정보통신학회논문지
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• 제24권8호
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• pp.1052-1057
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• 2020

ICT 신기술의 발달과 함께, 차량용 스마트키도 ICT 기술이 적용된 단말기이다. 따라서 차량과 스마트키가 RF통신을 할 때, 사이버 해킹공격이 가능하다. 스마트키에 대한 사이버 공격으로 차량 탈취 및 차량 통제권의 위협을 가져다줄 수 있다. 따라서 자율주행차량용 스마트키에 대한 해킹 공격 및 취약점에 대한 연구가 필요하다. 본 논문에서는 차량과 스마트키에 대한 RF 통신에 대한 사이버공격 사례를 분석한다. 그리고 스마트키에 대한 실제 RF 사이버공격을 시행하고, 동일 주파수대역의 전파 복제에 대한 취약점을 찾는다. 본 논문에서는 차량과 스마트키의 RF통신의 취약점을 분석하고, 사이버보안 대응방안을 제안한다. 향후 자율주행차량의 대중화로 사이버 공격 및 보안성 강화 방안은 인간 및 차량의 안전을 지킬 수 있는 기초자료가 될 것이다.

• Journal of Communications and Networks
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• 제6권4호
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• pp.295-306
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• 2004

In this paper, a novel air-interface is presented for Fleet-Net1, a self-organizing network for inter-vehicle and vehicle-toroadsidecommunication. The air-interface is based upon the lowchip-rate version of UMTS/TDD. To adapt the cellular UMTS standard to an air-interface for ad hoc networks, changes of the physical layer, medium access control sub-layer and radio resource management are required. An overview of the required modifications is given here. Particularly, a decentralized synchronization mechanism is presented and analyzed by means of simulations. Furthermore, changes for the medium access control are explained in detail, which allow for an efficient operation in partly meshed networks and prioritization. Performance results of the overall system considering throughput and delay are derived by means of analytical evaluations and event-driven simulations. Based on realistic mobility models, it is shown that the presented solution provides a robust communication platform even in vehicular environments. The proposed air-interface is a cost-effective solution not only for inter-vehicle communication, but also for ad hoc networking in general, benefiting from the mass-market of UMTS.

• IEIE Transactions on Smart Processing and Computing
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• 제3권5호
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• pp.313-318
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• 2014

Recently, Ethernet-based Diagnostic Over Internet Protocol (DoIP) was applied to automotive systems, and in-vehicle gateways have been introduced to integrate Ethernet with traditional in-vehicle networks, such as the local interconnect network (LIN), controller area network (CAN) and FlexRay. The introduction of in-vehicle gateways and of Ethernet based diagnostic protocols not only decreases the complexity of the networks, but also reduces the update time for ECU software reprogramming while enabling the use of a range of services, including remote diagnostics. In this paper, a diagnostic gateway was implement for an automotive system, and the performance measurements are presented. In addition, a range of applications provided by the diagnostic gateway are proposed.

• 한국정보기술응용학회:학술대회논문집
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• 한국정보기술응용학회 2005년도 6th 2005 International Conference on Computers, Communications and System
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• pp.85-90
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• 2005

The advance of mobile and telematics technologies has produced vehicles with various convenient services for drivers. Specifically lots of researches and several technologies have been developed to provide services of a remote vehicle diagnosis and control. The existing and representative product for a vehicle control is a RCS (remote control system), but it has a problem of short control distance and fragile security. In this paper, a telematics terminal embedded with CDMA and GPS is designed, which can be connected to the Internet. It allows a driver with a cellular phone to remotely diagnosis and control a vehicle via wireless network and SMS.