Now showing items 1-20 of 83

    • Adaptive time-to-live strategies for query result caching in web search engines 

      Alıcı, Sadiye; Altıngövde, I. Ş.; Rıfat, Özcan; Cambazoğlu, B. Barla; Ulusoy, Özgür (2012)
      An important research problem that has recently started to receive attention is the freshness issue in search engine result caches. In the current techniques in literature, the cached search result pages are associated ...
    • Authorship attribution: performance of various features and classification methods 

      Bozkurt, I. N.; Bağlioğlu, Ö.; Uyar, E. (2007)
      Authorship attribution is the process of determining the writer of a document. In literature, there are lots of classification techniques conducted in this process. In this paper we explore information retrieval methods ...
    • Automatic detection of geospatial objects using multiple hierarchical segmentations 

      Akçay, H. G.; Aksoy, S. (Institute of Electrical and Electronics Engineers, 2008-07)
      The object-based analysis of remotely sensed imagery provides valuable spatial and structural information that is complementary to pixel-based spectral information in classification. In this paper, we present novel methods ...
    • Automatic detection of salient objects and spatial relations in videos for a video database system 

      Sevilmiş, T.; Baştan M.; Güdükbay U.; Ulusoy, Ö. (Elsevier BV, 2008-10)
      Multimedia databases have gained popularity due to rapidly growing quantities of multimedia data and the need to perform efficient indexing, retrieval and analysis of this data. One downside of multimedia databases is the ...
    • Automatic performance evaluation of Web search engines 

      Can, F.; Nuray, R.; Sevdik, A. B. (Elsevier, 2004)
      Measuring the information retrieval effectiveness of World Wide Web search engines is costly because of human relevance judgments involved. However, both for business enterprises and people it is important to know the most ...
    • Automatic ranking of information retrieval systems using data fusion 

      Nuray, R.; Can, F. (Elsevier Ltd, 2006-05)
      Measuring effectiveness of information retrieval (IR) systems is essential for research and development and for monitoring search quality in dynamic environments. In this study, we employ new methods for automatic ranking ...
    • BilKristal 4.0: A tool for crystal parameters extraction and defect quantification 

      Okuyan, E.; Okuyan, C. (Elsevier, 2015)
      In this paper, we present a revised version of BilKristal 3.0 tool. Raycast screenshot functionality is added to provide improved visual analysis. We added atomic distance analysis functionality to assess crystalline ...
    • Chat mining for gender prediction 

      Kucukyilmaz, T.; Cambazoglu, B. B.; Aykanat, C.; Can, F. (Springer, 2006)
      The aim of this paper is to investigate the feasibility of predicting the gender of a text document's author using linguistic evidence. For this purpose, term- and style-based classification techniques are evaluated over ...
    • ChiBE: interactive visualization and manipulation of BioPAX pathway models 

      Babur, O.; Dogrusoz, U.; Demir, E.; Sander, C. (Oxford University Press, 2010)
      SUMMARY: Representing models of cellular processes or pathways in a graphically rich form facilitates interpretation of biological observations and generation of new hypotheses. Solving biological problems using large ...
    • Client-server synchronization and buffering for variable rate multimedia retrievals 

      Hui J.Y.; Karasan, E.; Li J.; Zhang, J. (1996)
      We consider the use of large buffers and feedback as a mechanism to maintain loosely coupled synchronization between a multimedia server and a client. The multimedia stream is modeled as a fluid flow through rate controlled ...
    • Conceptfusion: A flexible scene classification framework 

      Sarac, M.I.; Iscen, A.; Golge, E.; Duygulu P. (Springer Verlag, 2015)
      We introduce ConceptFusion, a method that aims high accuracy in categorizing large number of scenes, while keeping the model relatively simpler and efficient for scalability. The proposed method combines the advantages of ...
    • Constrained min-cut replication for K-way hypergraph partitioning 

      Yazici V.; Aykanat, C. (Institute for Operations Research and the Management Sciences (I N F O R M S), 2014)
      Replication is a widely-used technique in information retrieval and database systems for providing fault tolerance and reducing parallelization and processing costs. Combinatorial models based on hypergraph partitioning ...
    • Content-based image retrieval in store catalogs 

      Baysal, S.; Kurt, M.C.; Aydogdu G.; Damc P.; Telmen I.; Duygulu P. (2009)
      In this paper, an overview of an application, which aims to make significant improvements on access methods to the online shopping catalogs, is presented. In current online shopping sites, only browsing and semantic based ...
    • Context learning in Okapi 

      Göker, A. (1997)
      A user who makes repeated use of a retrieval system may be assumed to have a context which is common to successive uses (even if the immediate need differs). An IR system which could make use of this context may be better ...
    • Cost-aware strategies for query result caching in Web search engines 

      Ozcan, R.; Altingovde, I. S.; Ulusoy, O. (Association for Computing Machinery, 2011)
      Search engines and large-scale IR systems need to cache query results for efficiency and scalability purposes. Static and dynamic caching techniques (as well as their combinations) are employed to effectively cache query ...
    • Cover coefficient-based multi-document summarization 

      Ercan, Gönenç; Can, Fazlı (Springer, 2009-04)
      In this paper we present a generic, language independent multi-document summarization system forming extracts using the cover coefficient concept. Cover Coefficient-based Summarizer (CCS) uses similarity between sentences ...
    • A database model for querying visual surveillance videos by integrating semantic and low-level features 

      Şaykol, Ediz; Güdükbay, Uğur; Ulusoy, Özgür (Springer, Berlin, Heidelberg, 2005)
      Automated visual surveillance has emerged as a trendy application domain in recent years. Many approaches have been developed on video processing and understanding. Content-based access to surveillance video has become a ...
    • A distributed and measurement-based framework against free riding in peer-to-peer networks 

      Karakaya, M.; Korpeoglu, I.; Ulusoy, Ö. (2004)
      In this paper, we propose a distributed and measurement-based method to reduce the degree of free riding in P2P networks. We primarily focus on developing schemes to locate free riders and on determining policies that can ...
    • Diversity and novelty in information retrieval 

      Santos, R. L. T.; Castells, P.; Altıngövde, I. S.; Can, Fazlı (ACM, 2013-07-08)
      This tutorial aims to provide a unifying account of current research on diversity and novelty in different IR domains, namely, in the context of search engines, recommender sys- tems, and data streams.
    • Diversity based Relevance Feedback for Time Series Search 

      Eravci, B.; Ferhatosmanoglu H. (2013)
      We propose a diversity based relevance feedback approach for time series data to improve the accuracy of search results. We first develop the concept of relevance feedback for time series based on dual-tree complex wavelet ...