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Πλοήγηση ανά Θέμα "Systems"

Αποτελέσματα 21-36 από 36

    • A network aware privacy model for online requests in trajectory data 

      Gkoulalas-Divanis, A.; Verykios, V. S.; Bozanis, P. (2009)
      In this work, we propose a privacy model for online user requests on trajectory data in location based services by utilizing an underlying network of user movement. The privacy model has been implemented as a framework ...

    • Node Isolation Probability for Serial Ultraviolet UV-C Multi-hop Networks 

      Vavoulas, A.; Sandalidis, H. G.; Varoutas, D. (2011)
      Non-line-of-sight optical wireless transmission, operated in the unlicensed ultraviolet UV-C band, has been recently suggested as an alternative means of communication. However, due to limited coverage, relayed UV-C networks ...

    • A novel cache aware routing scheme for Information-Centric Networks 

      Sourlas, V.; Flegkas, P.; Tassiulas, L. (2014)
      Information-Centric Networking (ICN) has attracted the attention of the research community, which has argued that content, instead of end-points, must be at the center stage of attention. The research issues addressed by ...

    • Performance Analysis of a Laser Ground-Station-to-Satellite Link With Modulated Gamma-Distributed Irradiance Fluctuations 

      Sandalidis, H. G. (2010)
      The performance of a ground-station-to-space laser uplink with a Gaussian-beam wave model subject to turbulence and beam wander effects is the topic of the present study. The modulated gamma distribution is used to describe ...

    • PRACTICAL ASPECTS OF MOBILITY IN WIRELESS SELF-ORGANIZING NETWORKS 

      De Amorim, M. D.; Ziviani, A.; Viniotis, Y.; Tassiulas, L. (2008)

    • PREDICTION IN WIRELESS NETWORKS BY MARKOV CHAINS 

      Katsaros, D.; Manolopoulos, Y. (2009)
      Discrete sequence modeling and prediction is an important goal and a challenge for pervasive computing. Mobile clients' data request forecasting and location tracking in wireless cellular networks are characteristic ...

    • Providing quality of service guarantees in wireless LANs compliant with 802.11e 

      Korakis, T.; Tassiulas, L. (2005)
      Quality of Service (QoS) support is a key attribute of a broadband communication system and is missing in 802.11-based wireless LANs. Recognizing the need, Task Group e (TGe) is work-ins! towards 802.11e, an evolution of ...

    • Routing and scheduling connections in networks that support advance reservations 

      Varvarigos, E.; Sourlas, V.; Christodoulopoulos, K. (2008)
      A key problem in networks that support advance reservations is the routing and time scheduling of connections with flexible starting time and known data transfer size. In this paper we present a multicost routing and ...

    • Social Network Analysis Concepts in the Design of Wireless Ad Hoc Network Protocols 

      Katsaros, D.; Dimokas, N.; Tassiulas, L. (2010)
      This article presents a survey of ad hoc networking protocols that have used concepts such as centrality metrics and community formation from the area of social network analysis, which is seen as a network measurement task ...

    • Storage planning and replica assignment in content-centric publish/subscribe networks 

      Sourlas, V.; Flegkas, P.; Paschos, G. S.; Katsaros, D.; Tassiulas, L. (2011)
      Content-centric publish/subscribe networking is a flexible communication model that meets the requirements of the content distribution in the Internet, where information needs to be addressed by semantic attributes rather ...

    • Time-optimized user grouping in Location Based Services 

      Anagnostopoulos, C.; Hadjiefthymiades, S.; Kolomvatsos, K. (2015)
      We focus on Location Based Services (LBSs) which deliver information to groups of mobile users based on their spatial context. The existence (and non-trivial lifetime) of groups of mobile users can simplify the operation ...

    • A tool for calculating energy consumption in wireless sensor networks 

      Dimitriou, G.; Kikiras, P. K.; Stamoulis, G. I.; Avaritsiotis, I. N. (2005)
      Energy and total useful lifetime are primary design concerns of fundamental importance, in a variety of real life applications, where the deployment of a Wireless Sensor Network is desired. In this paper the authors introduce ...

    • Using a HAP Network to Transfer WiMAX OFDM Signals: Outage Probability Analysis 

      Vaiopoulos, N.; Sandalidis, H. G.; Varoutas, D. (2013)
      Transferring wireless broadband services across extremely far distances on Earth is usually implemented nowadays either by ground-based or satellite communications. Terrestrial networks require, however, heavy installation ...

    • VIPSec defined 

      Zisiadis, D.; Kopsidas, S.; Tassiulas, L. (2008)
      Secure end-to-end information exchange is a constant challenge in electronic communications. Novel security architectures and approaches are proposed constantly, to be followed by announcements of sophisticated attack ...

    • Weather Effects on FSO Network Connectivity 

      Vavoulas, A.; Sandalidis, H. G.; Varoutas, D. (2012)
      The use of relays is one of the most promising methods for mitigating impairments of the performance of free-space optical (FSO) systems and extending their limited transmission range. However, several factors contribute ...

    • WeR-trees 

      Bozanis, P.; Foteinos, P. (2007)
      R-tree has been proven to be one of the most practical and well-behaved data structures for accommodating dynamic massive sets of low dimensionality geometric objects and conducting a very diverse set of queries on such ...