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  • 1. Ciszkowski, Tomasz
    et al.
    Mazurczyk, Wojciech
    Kotulski, Zbigniew
    Hossfeld, Tobias
    Fiedler, Markus
    Blekinge Institute of Technology, School of Computing.
    Collange, Denis
    Towards Quality of Experience-based reputation models for future web service provisioning2012In: Telecommunications Systems, ISSN 1018-4864, E-ISSN 1572-9451, Vol. 51, no 4, p. 283-295Article in journal (Refereed)
    Abstract [en]

    This paper concerns the applicability of reputations systems for assessing Quality of Experience (QoE) for web services in Future Internet. Reputation systems provide mechanisms to manage subjective opinions in societies and yield a general scoring of a particular behavior. Thus, they are likely to become an important ingredient of Future Internet. Parameters being under evaluation by a reputation system may vary greatly and, particularly, may be chosen to assess the users’ satisfaction with (composite) web services. Currently, this satisfaction is usually expressed by QoE, which represents subjective users’ opinions. The goal of this paper it to present a novel framework of web services where a reputation system is incorporated for users satisfaction tracking and prediction. This approach is a beneficial tool, which enables providers to facilitate service adaptation according to users’ expectations and maintain QoE on a satisfying level. Presented reputation system operates in an environment of composite services running on a client and server side. It makes this approach highly suitable for effective QoE differentiating and maximizing user experience for specific customer profiles even the service and network resources are shared.

  • 2. Erman, David
    et al.
    Saavedra, Daniel
    González, José Á. Sánchez
    Popescu, Adrian
    Validating BitTorrent Models2008In: Telecommunications Systems, ISSN 1018-4864, E-ISSN 1572-9451, Vol. 39, no 2, p. 103-116Article in journal (Refereed)
    Abstract [en]

    BitTorrent (bt), a Peer-to-Peer (p2p) distribution system, is a major bandwidth consumer in the current Internet. This paper reports on a measurement study of bt traffic intended to identify potential traffic invariants. To this end, we employ high-accuracy packet capture hardware together with specialized parsing software. Important characteristics regarding bt sessions and messages as well as general system characteristics are reported. The results indicate that characteristics such as session inter-arrival times are corroborated to be exponentially distributed, while other characteristics are shown to differ from previously reported results. These differences are attributed to changes in the core bt algorithms. Further, it is observed that long- and heavy-tailed distributions can be used to model several characteristics. The log-normal, Pareto and mixtures of these distributions are used to model session sizes and durations, while the Weibull distribution has been observed to model message inter-arrival and inter-departure times for bandwidth-limited clients.

  • 3. Han, Guangjie
    et al.
    Xu, Huihui
    Duong, Quang Trung
    Blekinge Institute of Technology, School of Computing.
    Jiang, Jinfang
    Hara, Takahiro
    Localization algorithms of Wireless Sensor Networks: a survey2013In: Telecommunications Systems, ISSN 1018-4864, E-ISSN 1572-9451, Vol. 52, no 4, p. 2419-2436Article in journal (Refereed)
    Abstract [en]

    In Wireless Sensor Networks (WSNs), localization is one of the most important technologies since it plays a critical role in many applications, e.g., target tracking. If the users cannot obtain the accurate location information, the related applications cannot be accomplished. The main idea in most localization methods is that some deployed nodes (landmarks) with known coordinates (e.g., GPS-equipped nodes) transmit beacons with their coordinates in order to help other nodes localize themselves. In general, the main localization algorithms are classified into two categories: range-based and range-free. In this paper, we reclassify the localization algorithms with a new perspective based on the mobility state of landmarks and unknown nodes, and present a detailed analysis of the representative localization algorithms. Moreover, we compare the existing localization algorithms and analyze the future research directions for the localization algorithms in WSNs.

  • 4. Tham, Yiu-Kwok
    Burst assignment for generalized satellite-switched TDMA networks1997In: Telecommunications Systems, ISSN 1018-4864, E-ISSN 1572-9451, Vol. 8, no 2-4, p. 191-210Article in journal (Refereed)
    Abstract [en]

    A burst assignment problem for satellite-switched time-division multiple access networks is generalized to distinguish traffic requirements of earth stations in a network. This distinction leads to shorter transmission time in general. The satellite provides coverage for u uplink spotbeams and v downlink spotbeams with prescribed limits on the maximum number of available carriers in each spotbeam, subject to a total of K carriers in use at any one time. Earth stations are equipped for simultaneous transmission on and reception of multiple carriers. If u + v is O(K), the number of switching modes required is O(K-2) and a transmission-time optimal schedule can be found in O(K-4) time. Technology considerations are discussed.

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