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  • 1.
    Awad, Ali Ismail
    et al.
    Luleå tekniska universitet, Institutionen för system- och rymdteknik, Datavetenskap.
    Furnell, Steven
    Centre for Security, Communications & Network Research, Plymouth University.
    Hassan, Abbas M.
    Faculty of Engineering, Qena, Al-Azhar University, Egypt.
    Tryfonas, Theo
    University of Bristol, United Kingdom.
    Special issue on security of IoT-enabled infrastructures in smart cities2019Ingår i: Ad hoc networks, ISSN 1570-8705, E-ISSN 1570-8713, Vol. 83Artikel i tidskrift (Refereegranskat)
  • 2.
    Nikolakopoulos, George
    et al.
    Luleå tekniska universitet, Institutionen för system- och rymdteknik, Signaler och system.
    Stavrou, Pavlos
    Department of Informatics and Telecommunications, University of Athens.
    Tsitsipis, Dimitris
    Department of Electrical and Computer Engineering, University of Patras.
    Kandris, Dionisis
    Department of Electronics, Technological Educational Institute of Athens.
    Tzes, Anthony
    Department of Electrical and Computer Engineering, University of Patras.
    Theocharis, Theocharis
    Department of Informatics and Telecommunications, University of Athens.
    A dual scheme for compression and restoration of sequentially transmitted images over wireless sensor networks2013Ingår i: Ad hoc networks, ISSN 1570-8705, E-ISSN 1570-8713, Vol. 11, nr 1, s. 410-426Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    A dual scheme for the compression and restoration of sequentially transmitted images over Wireless Sensor Networks (WSN) is presented. These networks are characterized by low transmission rates, extended packet losses and limited power resources, factors that degrade the overall system performance. Especially in the cases of transmitting multimedia content, a considerable number of data packets are dropped, with a corresponding direct effect on the received image quality. For dealing with this loss of valuable information, various retransmission schemes have been proposed that act as quality of service modules. However, this approach increases energy consumption and inserts considerable time delays, due to the rise of the traffic load in the network. This article proposes a novel dual transmission scheme, targeting mainly the area of Multimedia WSNs (WMSN), that aims to decrease the overall traffic load introduced by the retransmission schemes, by performing image restoration for lost data packets, at the receiver side. The proposed novel dual scheme is based on: a) the Quad Tree Decomposition algorithm that is adopted for compressing the image data before transmission over the WSN, and b) the fast image inpainting algorithm for restoring the effect of the missing data packets. The overall proposed scheme has been applied inmultiple experimental studies that prove its efficacy.

  • 3.
    Pace, Pasquale
    et al.
    University of Calabria.
    Loscri, Valeria
    Inria Lille-Nord Europe/FUN.
    Zheng, Zhengguo
    University of Sussex.
    Ruggeri, Guiseppe
    University Mediterranea of Reggio Calabria.
    Vasilakos, Athanasios
    Luleå tekniska universitet, Institutionen för system- och rymdteknik, Datavetenskap.
    Smart Wireless Access Networks and Systems for Smart Cities2016Ingår i: Ad hoc networks, ISSN 1570-8705, E-ISSN 1570-8713, Vol. 43, s. 1-2Artikel i tidskrift (Övrigt vetenskapligt)
  • 4. Phanse, Kaustubh
    et al.
    DaSilva, Luiz A.
    Virginia Polytechnic Institute and State University.
    Midkiff, Scott F.
    Virginia Polytechnic Institute and State University.
    Design and demonstration of policy-based management in a multi-hop ad hoc network2005Ingår i: Ad hoc networks, ISSN 1570-8705, E-ISSN 1570-8713, Vol. 3, nr 3, s. 389-401Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    In this paper, we propose a policy-based framework for the management of wireless ad hoc networks and briefly describe a characteristics-based taxonomy that provides a platform to analyze and compare different architectural choices. We develop a solution suite that helps achieve our goal of a self-organizing, robust and efficient management system. One of the main contributions of this work is the prototype implementation and testing of the mechanisms and protocols comprising our framework in a multi-hop ad hoc network environment. Experiments are conducted using both an emulated ad hoc network testbed and a true wireless testbed. Degradation in management system performance is observed as the number of hops between a policy server and client increases. Our proposed k-hop clustering algorithm alleviates this problem by limiting the number of hops between a server and client. We demonstrate the operation of our prototype implementation, illustrating QoS management in a multi-domain ad hoc network environment using the proposed cluster management, redirection, and policy negotiation mechanisms.

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