• Proceedings of the Korea Information Processing Society Conference
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• 2010.11a
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• pp.1241-1244
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• 2010

인간의 가장 큰 욕구인 편의와 안전을 위해 우리의 곁에서 떨어질 수 없는 것이 차량이다. 그러므로 차량을 이용하면서 겪게 되는 안전과 편의 또한 떼어놓을 수 없는 문제 중에 하나다. 그 편의와 안전을 위해 VANET이 활발히 개발 중이다. VANET은 차량에서 사용되는 근거리/중거리 통신용 무선 프로토콜로써 차량 간 통신인 V2V, 차량과 네트워크 기반구조 간의 통신인 V2I를 지원하는 네트워크로써 다양한 서비스를 제공한다. 이에 학문적, 상업적으로 많은 관심을 받고 있다. 그러나 네트워크 기반의 기술인만큼 사용자의 프라이버시 침해가 큰 문제로 대두되고 있다. 이 중에서도 사용자의 익명성, 추적성, 객체인증에 관한 Location Privacy는 개발과정에서 큰 걸림돌이 되고 있다. 이에 본 논문에서는 VANET에서의 Location Privacy 보호에 대한 기술들의 개략적인 내용을 서술하고, 장단점을 분석하였다. Location Privacy 보호를 위한 기술에는 해쉬통합을 이용한 보호기술, MAC-체인을 이용한 보호기술, 그리고 세션 키 교환을 이용한 보호기술이 있다. 세 가지 기술 중에서 MAC-체인을 이용한 기술이 Location Privacy 보호에 가장 적합하다.

• Journal of the Korea Academia-Industrial cooperation Society
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• v.21 no.8
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• pp.18-25
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• 2020

With the development of water internet technology, data communication between objects is expanding. Research related to data communication technology between vehicles that incorporates related technologies into vehicles has been actively conducted. For data communication between mobile terminals, data stability, reliability, and real-time performance must be guaranteed. The 5 GHz Wi-Fi band, which is advantageous in bandwidth, communications speed, and wireless saturation of the wireless network, was selected as the data communications network between vehicles. This study analyzes how to design and implement a 5 GHz Wi-Fi network in a vehicle network. Considering the characteristics of the mobile communication terminal device, a continuous variable communications structure is proposed to enable high-speed data switching. We simplify the access point access procedure to reduce the latency between wireless terminals. By limiting the Transmission Control Protocol Internet Protocol (TCP/IP)-based Dynamic Host Configuration Protocol (DHCP) server function and implementing it in a broadcast transmission protocol method, communication delay between terminal devices is improved. Compared to the general commercial Wi-Fi communication method, the connection operation and response speed have been improved by five seconds or more. Utilizing this method can be applied to various types of event data communication between vehicles. It can also be extended to wireless data-based intelligent road networks and systems for autonomous driving.

• The KIPS Transactions:PartA
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• v.17A no.4
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• pp.203-212
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• 2010

Recently, in automotive industry, there have been many researches related with hardware components and embedded software which controls hardware components. Since most of embedded software is tightly dependent on car manufacturers, there were some problems in reusability and interoperability of automotive software. In order to solve these problems, AUTOSAR standardized the component-based software architecture of automotive software. In AUTOSAR, several modeling diagrams should be described and their dependencies are also checked. Currently, a few company developed the prototypes of tools supporting AUTOSAR. In this paper, a component modeling tool based on AUTOSAR 3.0 is developed for enhancing the usability of existing tools using Eclipse GMF. The tool is composed of a graphical component modeling tool and a graphical network topology tool. Since these tools are generated based on GMF without hard coding, it is relatively easy to customize the tools for adopting company‘s needs and easy to follow the improvement of the standard and development environments.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2003.10a
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• pp.492-495
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• 2003

최근에 새롭게 출현하고 있는 텔레매틱스는 통신(telecommunication)과 정보과학(informatics)의 합성어로 무선망을 통한 음성 및 데이터 통신과 GPS을 기반으로 차량에 정보를 주고받음으로서 새로운 부가 서비스를 제공하는 기술을 의미한다. 텔레매틱스 무선 네트워크의 연결을 위해 여러 가지 통신방식이 사용되고 있으며 이동통신 기술의 발전에 따라 그 행보를 같이 하고 있다. 한편, 텔레매틱스 서비스의 중심에 있는 차량용 단말기는 이러한 여러 무선망과의 연결뿐만 아니라 위치기반 서비스, entertainment, 응급구조, office 서비스 둥을 지원하기 알맞게 설계 되야 한다. 본 논문에서는 이러한 요구에 부합할 수 있는 임베디드 시스템을 구현하여 제시하여 본다.

• Transactions of the Korean Society of Automotive Engineers
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• v.19 no.4
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• pp.54-63
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• 2011

An educational network system based on CAN protocol internal to a passenger ground vehicle has been developed. The developed network system has been applied to a commercial plug-in electrical vehicle and verified the educational applicability. To apply this in-vehicle network technology based on CAN, a suitable electric vehicle has been chosen and a CAN network structure has been designed, developed and manufactured. Since the commercial electric vehicle chosen as a test bed has its own proprietary electric network, we explain how the original electric network has been utilized and how the new network system has been designed. The developed network system on a real vehicle has been tested to show the applicability and the performance. Finally, the system has been applied at few classrooms to demonstrate how the in-vehicle network system works and to teach how to analyse the CAN signals. The developed system proven to be effective for educational purpose.

• The Journal of the Institute of Internet, Broadcasting and Communication
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• v.16 no.6
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• pp.311-318
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• 2016

Recent vehicles are using car internal network for various purposes such as vehicle control, diagnostic functions, and ECU program upgrade. Currently CAN and FlexRay are the most representative networks. In the next-generation network, the use of CAN FD and car ethernet is actively studied. In this paper, we aimed to compare and evaluate the diagnostic function and the program of the ECU from the upgrade view on characteristics related to download time for each network when CAN, CAN FD, and FlexRay network are applied. As a result of the simulation, it was possible to determine that the CAN FD network is currently the most suitable for the next-generation network by suppressing other networks in terms of cost performance even under conditions of 500 Kbps and 2 Mbps which are practically usable speeds.

• Journal of the Institute of Electronics and Information Engineers
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• v.53 no.4
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• pp.27-34
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• 2016

In the train system, railway vehicles are connected in a line. Therefore, this feature should be considered in composing network topology in a train system. Besides, inter-car communication should be distinguished from in-car communication. As for the inter-car communication, the hybrid topology was proposed to use rather than the conventional ring, star, daisy-chain, and bus topologies. In the hybrid topology, a number of cars are bound to be a group. Then star topology is used for the communication in a group and daisy-chain topology is used for the communication between groups. Hybrid topology takes the virtue of both star and daisy-chain topologies. Hence it maintains communication speed with reducing the number of connecting cables between cars. Therefore, it is important to choose the number of cars in a group to obtain higher performance. In this paper, we focus on the optimization of hybrid topology for railway cars. We first assume that the size of data and the frequency of data production for each car is identical. We also assume that the importance for the maximum number of cables to connect cars is variable as well as the importance of the communication speed. Separated weights are granted to both importance and we derive the optimum number of cars in a group for various number of cars and weights.

• Proceedings of the Korean Society of Surveying, Geodesy, Photogrammetry, and Cartography Conference
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• 2009.04a
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• pp.7-9
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• 2009

Because unlike cars, pedestrians are not moving along the middle axis of street lanes, PNS needs more sophisticated information. So we defined the specific needs of pedestrians, analyzed already existing geodata sets and selected the reasonable layers.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2010.05a
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• pp.101-104
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• 2010

MOST는 동기식 데이터, 비동기식 데이터, 제어 데이터를 전송할 수 있는 차량용 멀티미디어 네트워크이다. MOST 네트워크에는 높은 대역폭과 동영상이나 오디오를 버퍼링 없이 전송할 수 있는 동기식데이터 영역이 존재한다. 이러한 동기식 영역을 통해 실시간 데이터를 전송하기 위해서는 소스노드와 싱크노드와의 커넥션 및 해당 채널 할당이 요구된다. 본 논문은 이러한 동기식 영역을 사용하기 위한 모듈을 설계한 후 실제 MOST 네트워크를 구축하여 노드 간 동기식 데이터 전송을 위한 절차와 채널 할당에 대한 이해를 돕고자 한다.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2009.10a
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• pp.801-804
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• 2009

국내에서 차량용 멀티미디어 네트워크인 MOST에서 내부 네트워킹에 관한 사례는 있으나 MOST 네트워크에서 TCP/IP 지원을 위한 MAMAC 프로토콜에 관한 사례는 알려져 있지 않다. MAMAC 프로토콜은 MOST 네트워크와 Ethernet과의 패킷전송을 위한 효율적 프로토콜로 MOST협회에서 표준화를 하였고 현재 MOST MAMAC Specification 1.1까지 진행되었다. 따라서 본 연구에서는 MOST 네트워크와 Ethernet간의 데이터 전송을 위한 MAMAC 프로토콜을 분석하며 TCP/IP를 지원하는 MOST 장비 개발 시 MAMAC 프로토콜기술 적용 방안을 제시하였다.