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Telecommunications, 2007. ITST '07. 7th International Conference on ITS

Date 6-8 June 2007

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  • 2007 7th International Conference on ITS Telecommunications

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    The following topics were dealt with: intelligent transport systems (ITS) applications/services; naming/addressing; risk management for safety services; IP routing, geo-routing, broadcasting for VANETs; protocol conformance testing, interoperability testing and quality assessment; vehicle communications; ITS components and systems; multimedia broadcasting technologies; cooperative systems; ITS architecture, interoperability and standards; vehicular radio transmission technologies; on board equipment; embedded electronics; policy, social and institutional ITS issues; mobile IP and network mobility in IPv6; sensing technologies; (smart) antennas and propagation; MAC schemes; device and circuit technologies; software defined radio for ITS; multiple interface management; ITS sensor networks; ITS policies; CALM - C2CCC; maritime ITS technologies; GALILEO; intelligent mobility on railway transports. View full abstract»

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  • [Copyright notice]

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    Freely Available from IEEE
  • 2007 7th International Conference on ITS Telecommunications

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  • Table of contents

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  • Message from General Chairs

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  • Message from Technical Program Committee Chairs

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  • Message from the International Advisory Board Committee

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  • Organizing Committee

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  • International Advisory Board

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  • Steering Committee (SC)

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  • Technical Program Committee

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  • ITS Applications - 1

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  • User-Adapted Car Navigation System using a Bayesian Network -Personalized Recommendation of Content

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    Recent car navigation systems now provide more content than ever. However, retrieving and selecting such content poses safety issues to users, especially drivers. Moreover, usability issues arise from simple user interfaces. Thus, it is important for the system to recommend content adapted to the user's preferences and situations automatically. In this paper, we analyze the validity of applying a Bayesian network to a user preference model of a content recommendation system in cars. We also present a practical way of building models using an information criterion as well as domain knowledge and an incremental learning method to adapt to individual users. View full abstract»

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  • An Effective Remote Transmission Method for Health Monitoring System of Bridge Group Based on SDH Technology

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1487 KB) |  | HTML iconHTML  

    With the great development of economy and society, large quantities of bridge need to be monitored in the highway and the distance between two bridges located in different places may be even more than 50 kilometers. The remote transmission is the key premise for remote monitoring of several bridges or more (bridge group) at same time. In this paper, an effective remote transmission method is presented for health monitoring system of bridge group based on SDH technology. In the context, the remote communication principle of the proposed method is stated firstly and then the hardware and software configurations are given out respectively. Finally the availability of the remote transmission system is proven by the results from a real application example for health monitoring of four bridges in different places. View full abstract»

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  • Estimating Road Traffic Congestion from Cell Dwell Time using Neural Network

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    In this study, we investigated an alternative method to estimate the degree of road traffic congestion based on a new measurement metric called cell dwell time (CDT) using simple feedforward backpropagation neural network. CDT is the duration that a cellular phone is registered to a base station before handing off to another base station. As a vehicle with cellular phone traverses along the road, cell handoffs occur and the values of CDT vary. Our assumption is that the values of CDT relate to the degree of traffic congestion and that high CDTs indicate congested traffic. In this study, we measured series of CDTs while driving along arterial roads in Bangkok metropolitan area. Human judgment of traffic condition was recorded into one of the three levels indicating congestion degree -free flow, moderate, or highly congested. Neural network was then trained and tested using the collected data against human perception. The results showed promising performance of congestion estimation with accuracy of 79.43%, precision ranging from 73.53% to 85.19%, and mean square error of 0.44. View full abstract»

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  • Studies on the transfer data modeling in the public transport information system

    Page(s): 1 - 6
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    Transfer is the most obvious and important characteristic of intermodal and multimodal transport systems. In a Public Transport Information System (PTIS), the structure design of transfer data is the key point in building up the database of transit networks, for it not only concerns the efficiency of some main applications such as the shortest path search and the management of lines service, but also determines the design of Human-Machine Interface (HMI) which affects the efficiency of data access, management and maintenance. On the basis of the topology of the public transportation network defined by the European standard --TRIDENT, we propose 3 modes to organize the transfer data according to different constraints of data quantity, precision and accuracy. Finally, a conclusion is presented by the feedback of implantation and comparison. View full abstract»

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  • Research on Bus Arrival Time Prediction Based on Multi-Source Traffic Information

    Page(s): 1 - 5
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (8010 KB) |  | HTML iconHTML  

    Bus Arrival Time Prediction (BATP) is one component of ITS and travel time information is also a major aspect of Bus Information Service System In order to predict travel time, in an accurate and timely manner, the consideration of traffic state is essential, including traffic congestion, bus dwell time at stops, intersection signal time, weather and incidents information etc. In this paper, previous research has been looked up to and a BATP model has been developed to predict the bus arrival time with data from 910-line buses in Shanghai. A BAT code has been created to consider multi-source traffic information for predicting bus arrival time. At last the prediction results have been proved good enough to applying. So the BATP model in this paper will has practical meanings for project. View full abstract»

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  • Load Balanced AODV - An Improvement of Performance and Fairness

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    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (408 KB) |  | HTML iconHTML  

    In this paper we focus on the performance improvement of reactive routing protocol of wireless ad-hoc networks by considering traffic load and geographical information of the network that are involved in routing procedure. A mobile node that already has or potentially will have excessive routing duty should act as a relaying node with relatively low probability. We use three parameters that are available in AODV: the size of routing table L, the expiration time of each route entry i in the table Δti, and the number of neighbors of each node j involved in routing nj. Simulation results from ns-2 show that our scheme gives significant improvement in terms of packet delivery ratio, end-to-end delay, and arrival jitter. View full abstract»

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  • Localized Multiple Next-hop Routing Protocol (LMNR)

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    In this paper we propose a novel reactive multi-path routing protocol for wireless (and vehicular) ad-hoc networks. The proposed scheme tries to establish and maintain local multiple paths to a certain destination, instead of finding multiple global paths between the source and destination nodes as most other multipath solutions do. To achieve this, we adopt and modify the well-known reactive routing protocol AODV. Using this scheme, source node and intermediate nodes are able to find a better next-hop dynamically when the network topology or traffic activity are changed. A cost function is given to let the related nodes to make decisions. NS-2 simulations show that our scheme gives significant improvement in terms of packet delivery ratio, routing overhead, and energy consumption. View full abstract»

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  • Analytic method for real-time traffic problems by using Contents Oriented Communications in VANET

    Page(s): 1 - 6
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (3279 KB) |  | HTML iconHTML  

    Today, ITS (intelligent transport systems) is paid attention by people all over the world. ITS is the system that solves the road traffic problems by using communications technology of vehicles. IVC ( inter vehicle communications ) is the communications technology that vehicles exchange the information by using wireless LAN without any base stations. VANET ( vehicular ad-hoc network ) have been expected to provide new applications for passengers of vehicles, by enabling vehicles to communicate with each other via IVC as well as with roadside base stations via RVC ( roadside-to-vehicle communications ). We propose the COC ( contents oriented communications ) system on VANET via IVC. With COC, each vehicle collects original information that each vehicle has by communicating each other, and creates contents which may be useful for drivers, by analyzing original information. COC deliver the analyzed contents to other vehicles. The simulation results show that COC provide timely information of vehicular accidents and congestion to drivers. View full abstract»

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  • Smart Protocol for Communication in Mobile Ad Hoc Network of Vehicles

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    In this paper we present a smart protocol for intervehicle communication based on mobile ad hoc networks. The protocol is capable of handling both broadcast as well as unicast messages for a particular node. The protocol implements controlled flooding in an efficient manner to reduce unnecessary communication overheads. The protocol avoids forming clusters and clusterheads by using the concept of selective forwarding. Thus it gets the advantages related to clusters without actually forming one itself. It effectively deals with blind flooding by introducing a comprehensive retransmission time delay in the nodes. This retransmission delay favors the nodes in the direction of the destination and restricts other nodes from transmitting the same message again. The proposed protocol avoids the use of routing tables which have a short life in mobile networks needing frequent updates. Instead the protocol relies on directing the messages to geographic locations which are forwarded by any available intermediary nodes. The protocol also provides techniques for handling network fragmentation which is a frequent problem for the vehicular networks. The protocol is implemented using NS2 and simulation results are compared with AODV. View full abstract»

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  • Throughput Comparison of CSMA and CDMA slotted ALOHA in Inter-Vehicle Communication

    Page(s): 1 - 6
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (879 KB) |  | HTML iconHTML  

    This paper compare the throughput performance of a carrier-sense multiple access (CSMA) scheme that uses an orthogonal frequency division multiple access (OFDM) physical layer and a CDMA slotted ALOHA scheme based on multicarrier CDMA (MC-CDMA) in inter-vehicle communication (IVC). In particular, we compare the throughputs in a situation where a hidden terminal is no longer negligible. We encounter such a situation in an intersection where two or more cars are crossing by. In a hidden terminal situation, the CSMA scheme may degrade throughput. On the other hand, CDMA slotted ALOHA has a resistance to the hidden terminal situation as it can support simultaneous packets. However, the transmission data rate is much slow because of the spreading. Thus the total throughput may not be as high as the CSMA based OFDM even in a hidden terminal situation. As a result, we show that the CSMA based OFDM system shows better total throughput than CDMA slotted ALOHA in all region. But, only the signal from the nearest car can be received. On the contrary, CDMA slotted ALOHA can be received many packets simultaneously. This is much preferable feature for safety driving. View full abstract»

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  • Vehicular network Transmission Technologies

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