• Title/Summary/Keyword: V2X technology

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Coverage Test of WAVE-LTE Hybrid V2X Communication System (WAVE-LTE 하이브리드 V2X 통신시스템의 커버리지 테스트)

  • Yoon, Sang-hun;Lim, Ki-taeg;Kwak, Jae-min
    • Journal of Advanced Navigation Technology
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    • v.24 no.3
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    • pp.212-217
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    • 2020
  • Recently, with the interest in the 4th industrial revolution, the demand for autonomous driving technology is increasing. V2X communication technology is a core technology for autonomous vehicles that exchanges information with objects such as vehicles, infrastructure, networks, and pedestrians through wired and wireless networks. In this paper, we present the results of the hybrid V2X communication system, which is a hybrid design of WAVE and LTE, and the coverage test to confirm the performance of the system. Through coverage measurement, we show that the hybrid V2X communication performance is superior to the existing LTE or WAVE single communication system in communication coverage, so it can be effectively applied to autonomous driving services.

Evaluation Environment based on V2X Communication for Commercial Vehicle Cooperative Autonomous Driving (상용차 자율협력주행 플랫폼 평가를 위한 V2X 기반 평가환경 개발)

  • Han-gyun Jung;Seong-keun Jin;Jae-min Kwak
    • Journal of Advanced Navigation Technology
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    • v.25 no.6
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    • pp.450-455
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    • 2021
  • In this paper, we introduce the contents of research on the establishment of an evaluation environment for autonomous cooperative driving platform for commercial vehicles based on V2X communication. For the evaluation of the autonomous cooperative driving platform based on V2X communication, various standards, standards, and guidelines for test evaluation should be developed and provided to the test subject, along with the establishment of test beds such as roads and V2X infrastructure that can apply various driving scenarios. do. In addition, based on this, various reference equipment and test equipment for actual test and evaluation should be developed. In this paper, various technologies, standards, equipment, and construction infrastructure developed to construct the evaluation environment for autonomous cooperative driving platform for commercial vehicles based on V2X communication are introduced.

Interoperation of Traffic Simulator and Network Simulator Through the External Interface Implementation (External 인터페이스 구현을 통한 트래픽시뮬레이터와 네트워크 시뮬레이터의 연동)

  • Seong, Jin-Seung;Lee, Joo-Young;Jung, Jae-Il
    • Journal of IKEEE
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    • v.18 no.3
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    • pp.435-441
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    • 2014
  • The V2X cooperative communication system is fusion technology which makes vehicle manuver safer. To evaluate and anticipate effect of these kind of technology, it requires real-car based road construction, implementation of communication devices, hiring inspection specialized personnel. For this reason, many laboratories and universities experience difficulties to test their technology results. Also, the need of implementing reliable testbed for testing vehicle safety applications and V2X communication technology is increasing as V2X device development is being accelerated. In this paper, we implemented a system which synchronizes traffic and network simulators via developing External interface to set simulation based testing environment in order to solve the difficulties.

Optical and Optoelectric Properties of PbCdS Ternary Thin Films Deposited by CBD

  • Mohammed, Modaffer. A.;Mousa, Ali M.;Ponpon, J.P.
    • JSTS:Journal of Semiconductor Technology and Science
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    • v.9 no.2
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    • pp.117-123
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    • 2009
  • $Pb_{x}Cd_{1-x}S$ films are prepared in the composition range of 0.05${\leq}x{\leq}$0.25, using a chemical bath deposition growth technique under optimum conditions amide at realizing good photo response. The x-ray diffraction results show that the films are of PbS-CdS composite with individual CdS and PbS planes. The films exhibit two direct band gaps, 2.4 eV attributed to CdS, while the other varies continuously from 2.4 eV to 1.3 eV. The films surface morphology is smooth with crystallite, whose grain size increases with increasing mole fraction (x). The decrease in band gap with increase in lead concentration suggests inter-metallic compound of PbS (Eg=0.41 eV) with CdS (Eg=2.4 eV)

Overview of 5G-NR-V2X System and Analysis Methodology of Communication Performance (5G-NR-V2X 시스템 개요 및 통신 성능 분석방법론)

  • Ji-Min Lee;Seong-Hyun Jang;Sang-Hun Yoon;Ki-Taeg Lim;Dae-Kyo Shin;Soo-Hyun Jang;Jun-Hyek Jang;Byoung-Man An
    • Journal of IKEEE
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    • v.28 no.3
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    • pp.310-320
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    • 2024
  • This article describes the 5G-NR-V2X system and its communication performance methodology. We present a system that can develop and verify the performance of self-driving services in a real road test environment using OBU and RSU for 5G-NR-V2X communication (level 4 or higher). This system ensures ultra-high speed (150Mbps or more), ultra-low latency (3ms or less), and high reliability (99.99 percent) in communication robustness, even under malicious conditions. The 5G-NR-V2X system and performance analysis method proposed in this paper are anticipated to aid in the development of V2X communication technologies that are ultrafast, ultralow-delay, and high-confidence. In addition, it is expected that the services validated by the suggested performance analysis technique will enhance technological competitiveness in the road, transportation, logistics, and commerce industries.

Hazard Analysis of Autonomous Vehicle due to V2I Malfunction (V2I 오작동에 의한 자율주행자동차의 위험성 분석)

  • Ahn, Dae-ryong;Shin, Seong-geun;Baek, Yun-soek;Lee, Hyuck-kee
    • The Journal of The Korea Institute of Intelligent Transport Systems
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    • v.18 no.6
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    • pp.251-261
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    • 2019
  • The importance of autonomous driving systems that utilize V2X services such as V2V(Vehicle to Vehicle) and V2I(Vehicle to Infrastructure) for safer and more comfortable driving is increasing with the recent development of autonomous vehicles. Partly autonomous vehicles based on environmental sensors have limitations for predicting and determining areas beyond the recognition distance of the mounted sensors and in response to atypical objects that are difficult to detect. Therefore, it is important to utilize the V2X service to improve the limit of sensor detection performance and to make driving safer and more comfortable. However, there may be an accident risk of autonomous vehicles due to incorrect information provided by V2X. Thus, the application of technology to prevent this needs to be considered. In this pater, we used the ISO-26262 Part3 Process and performed HARA (Hazard Analysis and Risk Assessment) to derive the risk sources of autonomous vehicles due to V2I malfunctions by using the communication between vehicles and infrastructure among V2X. We also developed ASIL ratings based on the simulations and real vehicle tests of the malfunctions of major cases of usnig V2I.

Design of Hybrid V2X Communication Module for Cooperative Automated Driving (자율협력주행을 위한 하이브리드 V2X 통신모듈 설계)

  • Lim, Ki-taeg;Jin, Seong-keun;Kwak, Jae-min
    • Journal of Advanced Navigation Technology
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    • v.22 no.3
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    • pp.213-219
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    • 2018
  • In this paper, we propose a design method and process for hardware and software of hybrid V2X communication module that supports both C-ITS communication protocol designed for vehicle environment and Legacy LTE communication technology. C-ITS is suitable for safety service applications due to its low latency characteristics, and Legacy LTE is a technology suitable for non-safety applications such as traffic information and infotainment due to high latency and high capacity. The hybrid V2X communication module supports multiple communication technologies of WAVE and LTE, in which WAVE supports multiple channels, so that it is designed to transmit road information such as LDM and positioning correction information to an autonomous vehicle in real time. The main design results presented in this paper will be applied to the implementation of future hybrid V2X communication terminals for vehicles.

Experimental Analysis of V2X Communication Performance based on WAVE at the SMART-Highway Test-bed (스마트하이웨이 테스트베드에서의 WAVE 기반 V2X 통신 성능에 대한 실험적 분석)

  • Jung, Han-Gyun;Lim, Ki-Taeg;Shin, Dae-Kyo;Yoon, Sang-Hun;Jin, Seong-Keun;Jang, Soo-Hyun;Shin, Joon-Soo
    • The Journal of The Korea Institute of Intelligent Transport Systems
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    • v.15 no.4
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    • pp.115-128
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    • 2016
  • Many research activities to reduce accidents on the road and to improve traffic efficiency have been performed and almost research projects are developing technologies and services based on C-ITS technology nowadays. The main concept of C-ITS is improving road safety and traffic efficiency by sharing and reproducing information between various elements. To accomplish this goal, V2X communication technology has been adopted. In Korea, we have studied V2X communication technology in support of SMART-Highway research project and are managing test-bed to verify the developed technology recently. In this paper, we introduce SMART-Highway test-bed and show the procedure and result of V2X communication performance analysis on the test-bed.

Electronic Structures, Magnetic, and Superconducting Properties of bcc Ni and V-doped Ni (Ni16-xVx)

  • Kim, Bong-Jae;Choi, Hong-Chul;Kim, Kyoo;Min, B.I.
    • Journal of Magnetics
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    • v.13 no.4
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    • pp.128-131
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    • 2008
  • We have investigated the electronic structures and magnetic properties of both undoped and doped bcc Ni using the full-potential linearized augmented plane wave (FLAPW) band method. A ferromagnetic ground state is obtained at the equilibrium volume of bcc Ni. When the system is under strain, the nonmagnetic ground state is stabilized. When the Ni is doped with V, the $Ni_{16-x}V_x$ material loses its magnetic properties when x > 2. We have also discussed the possible superconducting properties of $Ni_{16-x}V_x$.

Electrochemical Properties of Li1.1V0.75W0.075Mo0.075O2/Graphite Composite Anodes for Lithium-ion Batteries

  • Kim, Hyung-Sun;Kim, Sang-Ok;Kim, Yong-Tae;Jung, Ji-Kwon;Na, Byung-Ki;Lee, Joong-Kee
    • Bulletin of the Korean Chemical Society
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    • v.33 no.1
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    • pp.65-68
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    • 2012
  • Novel type $Li_{1.1}V_{0.9-2x}W_xMo_xO_2$ powders were prepared by a solid-state reaction of $Li_2CO_3$, $V_2O_3$, $WO_2$ and $MoO_2$ precursors in a nitrogen atmosphere containing 10 mol % hydrogen gas, and assessed as anode materials in lithium-ion batteries. The specific charge and discharge capacities of the $Li_{1.1}V_{0.9-2x}W_xMo_xO_2$ anodes were higher than those of the bare $Li_{1.1}V_{0.9}O_2$ anode. The cyclic efficiency of these anodes was approximately 73.3% at the first cycle, regardless of the presence of W and Mo doping. The composite anode, which was composed of $Li_{1.1}V_{0.75}W_{0.075}Mo_{0.075}O_2$ (20 wt %) and natural graphite (80 wt %), demonstrated reasonable specific capacity, high cyclic efficiency, and good cycling performance, even at high rates without capacity fading.