Show simple item record

dc.contributor.authorBolikowski, Łukasz
dc.date.accessioned2011-06-01T12:19:58Z
dc.date.available2011-06-01T12:19:58Z
dc.date.issued2011-06-01
dc.identifier.urihttp://depot.ceon.pl/handle/123456789/66
dc.description.abstractWe have investigated the problem of clustering documents according to their semantics, given incomplete and incoherent hints reflecting the documents’ affinities. The problem has been rigorously defined using graph theory in set-theoretic notation. We have proved the problem to be NP-hard, and proposed five heuristic algorithms which deal with the problem using five quite different approaches: a greedy algorithm, an iterated finding of maximum cliques, energy minimization inspired by molecular mechanics, a genetic algorithm, and an adaptation of the Girvan-Newman algorithm. As a side effect of the fourth heuristic, an efficient and aesthetically appealing method of visualization of the large graphs in question has been developed. The approaches have been tested empirically on the network of links between articles from over 250 language editions of Wikipedia. A thorough analysis of the network has been performed, showing surprisingly large semantic drift patterns and an uncommon topology: a scale-free skeleton linking tight clusters. It has been demonstrated that, using a blend of the proposed approaches, it is possible to automatically detect, and to a large extent eliminate, the semantic drift in the network of links between the language editions of Wikipedia. Last but not least, an open-source implementation of the proposed algorithms has been documented.en
dc.language.isoenen
dc.rightsCreative Commons Uznanie autorstwa 3.0 Polskapl_PL
dc.rights.urihttp://creativecommons.org/licenses/by/3.0/pl/legalcode
dc.titleMethods of Semantic Drift Reduction in Large Similarity Networksen
dc.typeinfo:eu-repo/semantics/doctoralThesisen
dc.contributor.organizationInterdyscyplinarne Centrum Modelowania Matematycznego i Komputerowego, Uniwersytet Warszawskipl_PL
dc.description.epersonŁukasz Bolikowski
dc.rights.DELETETHISFIELDinfo:eu-repo/semantics/openAccess


Files in this item

Thumbnail

This item appears in the following Collection(s)

Show simple item record

Creative Commons Uznanie autorstwa 3.0 Polska
Except where otherwise noted, this item's license is described as Creative Commons Uznanie autorstwa 3.0 Polska