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  • 1.
    Frecon, Emmanuel
    et al.
    RISE., Swedish ICT, SICS.
    Smith, Gareth
    Steed, Anthony
    Stenius, Mårten
    Ståhl, Olov
    RISE., Swedish ICT, SICS.
    An overview of the COVEN platform2001Ingår i: Presence - Teleoperators and Virtual Environments, ISSN 1054-7460, E-ISSN 1531-3263, Vol. 10, s. 109-127Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    A central aim of the COVEN project was to prototype large-scale applications of collaborative virtual environments (CVEs) that went beyond the existing state of the art. These applications were used in a series of real-scale networked trials that allowed us to gather many interesting human and technological results. To fulfil the technological and experimental goals of the project, we have modified an existing CVE platform: the DIVE (distributed interactive virtual environment) toolkit. In this paper, we present the different services and extensions that have been implemented within the platform during the four years of the project. Such a presentation will exemplify the different features that will have to be offered by next-generation CVE platforms. Implementation of the COVEN services has had implications at all levels of the platform: from a new networking layer through to mechanisms for high-level semantic modelling of applications.

  • 2. Greenhalgh, Chris
    et al.
    Bullock, Adrian
    Frecon, Emmanuel
    RISE., Swedish ICT, SICS.
    Making networked virtual environments work2001Ingår i: Presence - Teleoperators and Virtual Environments, ISSN 1054-7460, E-ISSN 1531-3263, Vol. 10, s. 142-159Artikel i tidskrift (Refereegranskat)
    Abstract [en]

    Collaborative virtual environments (CVEs) are a promising technology enabling remote participants to share a common place through three-dimensional graphical scenes. Within the COVEN project (Normand, 1999), we have run prolonged series of Internet trials that have allowed us to gather valuable data to formulate usability guidelines and networking requirements. However, running such trials in a real setting and making sure that the application and networking infrastructures will be stable enough is still a challenge. In this paper, we describe some of our experiences, together with the technical choices that have permitted many hours of successful Internet trials. We also make a thorough analysis of different correlated logging data. This analysis allows us to propose and confirm a model of a CVE application's network behaviour, together with a number of interesting results that disprove some common assumptions. Furthermore, we use the model and the logging data to highlight the benefits of IP multicasting and for predicting traffic behaviours and bandwidth use on top of different logical network topologies.

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