• Journal of the Korea Institute of Information and Communication Engineering
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• v.5 no.2
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• pp.263-268
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• 2001

This paper analyzes error probability performance adopted the Ray Tracing method efficiently analyzing millimeter wave or optic wave in Inter Vehicle Communication(IVC). Analysis environment analyzed bit error characteristic in 60㎓ band with very powerful to multipath wave, to be large to oxygen absorption and to be good to frequency reuse efficiency. We analyzed bit error characteristic of DS/CDMA system by multi access user in Two-Ray rician channel adopted reflect wave of grand, reflect wave of concrete wall and reflect wave of driving vehicle at side road. Improvement performance is adopted MRC diversity.

• Proceedings of the Korea Information Processing Society Conference
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• 2023.05a
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• pp.70-71
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• 2023

최근 자동차는 다양한 서비스를 제공하는 플랫폼으로 진화하고 있다. 이러한 서비스를 제공하기 위한 기본 인프라는 차량간 통신이다. 하지만, 자동차의 높은 이동성은 무선 통신 링크의 단절을 빈번하게 일으키는 요인이 된다. 따라서 링크의 단절에 대처하기 위한 효율적인 대책이 필요하다. 본 논문은 통신 링크 단절로 인한 성능 저하를 줄이기 위한 릴레이 노드 선택 기법을 제안한다. 시뮬레이션을 통한 성능 분석에서 제안하는 기법을 통해 네트워크 성능이 향상되는 것을 보여준다.

• Proceedings of the Korea Information Processing Society Conference
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• 2014.11a
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• pp.247-248
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• 2014

실시간으로 차량의 위치를 받아 업체가 운전자와 고객의 상태를 쉽게 파악하고 관리 할 수 있는 기술이다. 현재 개발되어 시중에 출시된 콜택시 어플리케이션은 업체 차량이나 개인 차량을 등록받아서 어플리케이션을 다운받은 고객이 1:1로 통신이 가능함을 목적으로 한다. 그로 인하여 누구나 쉽게 접근해서 사용할 수 있는 장점이 있으나 그 점이 범죄에 악용될 수 있는 문제를 가지고 있다. 또한 불법 차량이 개인적인 사업을 함에 있어 허가받은 차량들이 수익에 타격을 받는 많은 문제점을 일으키고 있다. 이 논문에서는 위에 문제를 해결하기 위하여 차량을 업체가 관리하고 등록하는 구조로 책임감과 신뢰감을 형성하고, 고객은 한층 더 안전한 구조의 콜택시 어플리케이션을 사용 할 수 있는 개선효과를 기대할 수 있다.

• KIPS Transactions on Computer and Communication Systems
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• v.2 no.6
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• pp.253-256
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• 2013

For the reliable delivery of safety-related information to vehicles in the VANET, a reliable VANET routing protocol is required. In this paper, we propose a routing protocol that works based on the road vehicle density information for fast and reliable communications among vehicles within the city environment VANET. In the proposed mechanism, each vehicle computes the road vehicle density by using beacon messages and the road information. Based on the road vehicle density information, each vehicle establishes a reliable route for packet delivery. Through the NS-2 based simulations, we compare our proposed mechanism with GPSR and show that our mechanism outperforms GPSR in terms of packet delivery success rate.

• Journal of Digital Convergence
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• v.13 no.4
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• pp.205-210
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• 2015

The auto industry has significantly evolved to the extent that much attention is paid to M2M (Machine-to-Machine) communication. In M2M communication which was first used in meteorology, environment, logistics, national defense, agriculture and stockbreeding, devices automatically communicate and operate in accordance with varying situations. M2M system is applied to vehicles, specifically to device-to-device communication inside cars, vehicle-to-vehicle communication, communication between vehicles and traffic facilities and that between vehicles and surroundings. However, communication systems are characterized by potential intruders' attacks in transmission sections, which may cause serious safety problems if vehicles' operating system, control system and engine control parts are attacked. Thus, device-to-device secure communication has been actively researched. With a view to secure communication between vehicular devices, the present study drew on hash functions and complex mathematical formulae to design a protocol, which was then tested with Casper/FDR, a tool for formal verification of protocols. In brief, the proposed protocol proved to operate safely against a range of attacks and be effective in practical application.

• Journal of the Korea Institute of Information and Communication Engineering
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• v.20 no.6
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• pp.1171-1176
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• 2016

VANET are a special kind of MANET adapted to the communications between vehicles. In this work, we propose the models used for representing the communication among vehicles, vehicles mobility features, and VANET simulator using realistic vehicular mobility models. VANET requires that a traffic and network simulator should be used together to perform this test. But, simulator tool has been preferred over traffic simulation because it simple, easy and cheap. Goal of this paper is to create a simulation of Vehicular Ad-Hoc network for urban scenario which can be used for testing purposes. Such environment can be used while designing better MAC protocols in VANETs. We are evaluating the performance of two routing protocols namely AODV and DSDV. The comparison was based on the throughout, packet loss and end-to-end delay. We found that DSDV has less throughput performance and high routing overhead than AODV. On average end-to-end delay and packet loss, AODV performs better than DSDV.

• The Journal of the Korea institute of electronic communication sciences
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• v.15 no.1
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• pp.53-60
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• 2020

With the major advancement of vehicle-related technologies and services, the demands for the in/out-vehicle service expansion increase significantly. The key importance of the service expansion is to provide various vehicle-centric services in addition to improve the convenience and usability of users with connectivity. Recently, Internet of Things (IoT) gains major attention for small device connectivity and service, and it widens its area to other industries including automotive to advance and diversify its services. In this paper, we investigated the technical direction of the IoT service with the analysis of IoT technologies in the perspective of the vehicle. At first, we analyzed the vehicle and IoT services in each so that we are able to suggest the service design guideline and consideration to release integrated services between vehicle and IoT. Also, we reviewed the cases of few vehicle and home IoT integration services for the major insights and future direction of the integration services.

• Proceedings of the Korean Institute of Information and Commucation Sciences Conference
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• 2003.10a
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• pp.641-644
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• 2003

텔레매틱스 정보통신 기술은 위성, 무선 정보통신 네트워크와 차량, 도로 네트워크 상에서 휴먼이라는 네트워크간의 새로운 패러다임 관계를 만들었다. 무선음성 데이터 통신과 인공위성을 이용한 위치정보시스템을 기반으로 자동차를 이용해 정보를 주고받을 수 있도록 하는 기술이다. 즉, 위치측정시스템과 무선통신망을 이용해 운전자와 탑승자에게 교통정보, 응급상황에 대한 대처, 원격차량진단, 인터넷 이용 각종 모바일 서비스를 제공할 수 있는 단말기와 운영체제를 말한다. 또한, 디지털 기술의 발전으로 정보기기, 컴퓨터, 가전기기 및 통신기기간의 기술융합이 활성화되면서 이와 관련된 네트워크, 단말기, 소프트웨어 응용 및 서비스 등의 분야에서도 연관 효과가 발생한다. 특히, 고속화와 모바일 환경의 급속한 확대로 운전자는 이동 중에 차량 내에서 모든 업무를 처리할 수 있는 이동 사무실 이라는 새로운 개념의 차량 정보화를 요구할 것이다. 따라서 본 논문에서는 텔레매틱스의 개요, 단말 플렛폼 표준 기술, 다양한 서비스 및 기술동향에 대한 전반적인 내용을 기술함으로써 향후 핵심기술을 도출하고 사업화에 대처하고자 한다.

• The Journal of The Korea Institute of Intelligent Transport Systems
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• v.10 no.4
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• pp.78-85
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• 2011

In vehicle ad-hoc network (VANET) environments, traffic related information such as accident information, emergency information and real time traffic condition have to be delivered to on-board-unit (OBU) or/and road-side-equipment (RSE) for preventing traffic accidents in advance. In this paper, we introduce a Multi-Channel MAC (MCM) since the existing single channel operation may cause packet transmission delay and unexpected communication failure. To offer a seamless safety message transmission during the various services, it is necessary to manage the MAC scheduler in wireless access in vehicular environments (WAVE) systems. The MCM consists of MAC softwares and MAC hardwares where the former and the later ones are implemented with real time operation system based C language and FPGA module with VHDL language, respectively. The performance and QoS are verified by practical measurements and compared with the scheme using single channel operation.

• Journal of Advanced Navigation Technology
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• v.4 no.2
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• pp.143-151
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• 2000

In this paper, short range IVC(Inter-Vehicle Communication) channel is modeled in three kinds considering rain attenuation and oxygen absorption. And the performance of DS/CDMA communication system in one path Rician model suitable for platton driving which is the final goal of AVHS(Advanced Vehicle & Highway System) is analyzed. Also, the reflection coefficients in 60 GHz is calculated. For the performance improvement both BCH channel coding and MRC diversity reception technique are adopted. The BER performance is evaluated as a function of packet length, Rician depth and the distance between vehicles.