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Browsing by Subject "system P2P"

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    Item type:Doctoral Dissertation, Access status: Open Access ,
    Kooperacyjne aplikacje do wspomagania zdalnego nauczania z wykorzystaniem ontologicznej integracji wiedzy w systemach P2P
    (2006-12-06) (Data obrony: 2012) Bułkowski, Aleksander
    Wydział Elektrotechniki, Automatyki, Informatyki i Elektroniki
    In this thesis, we explore new directions for future e-learning tools. The idea of dissertation is to use Peer-to-Peer (P2P) networks to disseminate learning objects that act as anchors for creating collaborative learning communities. The goal is to create collaborative spaces of learners with similar interests to exchange knowledge, opinions, and experience. The use of the P2P technology for disseminating learning objects requires several extensions to current P2P systems. First, we have defined a mutable complex structure of learning objects that can be represented in current P2P systems. Then, we have designed a scheme for precise indexing and searching in a BitTorrent network. Our approach takes advantage of attributes extracted from SCORM objects and of indexing concepts and terms added by the user from a domain ontology. To validate the proposed solutions, we have developed a prototype P2P client based on Azureus that uses OpenDHT, an open distributed storage service implemented over Planet Lab to store all needed associations: links between a learning object, its versions, and a torrent, as well as inverted indexes and the contact information of community members. The validation of the proposed schemes on a large-scale involved simulations in OMNet++ and OverSim representing the implementation over the tracker-less BitTorrent DHT.