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Πλοήγηση ανά Θέμα "Real data sets"

Αποτελέσματα 1-7 από 7

    • An Improved GPU-based Algorithmfor Processing the k Nearest Neighbor Query 

      Velentzas P., Moutafis P., Mavrommatis G. (2020)
      The k Nearest Neighbor (k-NN) query is a common spatial query that appears in several big data applications. We propose and implement a new GPU-based algorithm for the k-NN query, which improves our previous Symmetric ...

    • Maintaining Dimension's history in data warehouses effectively 

      Atay C.E., Garani G. (2019)
      A data warehouse is considered a key aspect of success for any decision support system. Research on temporal databases have produced important results in this field, and data warehouses, which store historical data, can ...

    • Nearest Neighbor Algorithms using xBR-Trees 

      Roumelis, G.; Vassilakopoulos, M.; Corral, A. (2011)
      One of the common queries in spatial databases is the (K) Nearest Neighbor Query that discovers the (K) closest objects to a query object. Processing of spatial queries, in most cases, is accomplished by indexing spatial ...

    • Nonlinear dimensionality reduction for clustering 

      Tasoulis S., Pavlidis N.G., Roos T. (2020)
      We introduce an approach to divisive hierarchical clustering that is capable of identifying clusters in nonlinear manifolds. This approach uses the isometric mapping (Isomap) to recursively embed (subsets of) the data in ...

    • Optimal stopping: A record-linkage approach 

      Moustakides, G. V.; Verykios, V. S. (2009)
      Record-linkage is the process of identifying whether two separate records refer to the same real-world entity when some elements of the records identifying information (attributes) agree and others disagree. Existing ...

    • Optimal Web Page Download Scheduling Policies for Green Web Crawling 

      Hatzi V., Cambazoglu B.B., Koutsopoulos I. (2016)
      A web crawler is responsible for discovering and downloading new pages on the Web as well as refreshing previously downloaded pages. During these operations, the crawler issues a large number of HTTP requests to web servers. ...

    • Web page download scheduling policies for green web crawling 

      Hatzi, V.; Cambazoglu, B. B.; Koutsopoulos, I. (2014)
      A web crawler is responsible for discovering new web pages on the Web as well as for refreshing the content of already downloaded pages. During these operations, it can issue a huge number of page download requests to the ...