Now showing items 21-29 of 29

    • SeaSpider: Automated information gathering on vessel movements in support of marine intelligence, surveillance, and reconnaissance 

      Tatar, Serhan; Chapman, D. M. F. (Spie, 2008-03)
      SeaSpider is an R&D tool to investigate the development of a software agent that would aid an operator in gathering information about marine vessels from public sources on the Internet. This information would supplement ...
    • Securing legacy firefox extensions with SENTINEL 

      Onarlıoğu, K.; Battal, Mustafa; Robertson, W.; Kırda, E. (Springer, 2013-07)
      A poorly designed web browser extension with a security vulnerability may expose the whole system to an attacker. Therefore, attacks directed at "benign-but-buggy" extensions, as well as extensions that have been written ...
    • Site-based dynamic pruning for query processing in search engines 

      Altıngövde İsmail Şengör; Demir, Engin; Can, Fazlı; Ulusoy, Özgür (ACM, 2008-07)
      Web search engines typically index and retrieve at the page level. In this study, we investigate a dynamic pruning strategy that allows the query processor to first determine the most promising websites and then proceed ...
    • Space efficient caching of query results in search engines 

      Özcan, Rıfat; Altıngövde, İsmail Şengör; Ulusoy Özgür (IEEE, 2008-10)
      Web search engines serve millions of query requests per day. Caching query results is one of the most crucial mechanisms to cope with such a demanding load. In this paper, we propose an efficient storage model to cache ...
    • Static query result caching revisited 

      Özcan, Rıfat; Altıngövde, İsmail Şengör; Ulusoy, Özgür (ACM, 2008-04)
      Query result caching is an important mechanism for search engine efficiency. In this study, we first review several query features that are used to determine the contents of a static result cache. Next, we introduce a new ...
    • Strategies for setting time-to-live values in result caches 

      Sazoğlu, Fethi Burak; Cambazoğlu, B. B.; Özcan, R.; Altıngövde, İsmail Şengör; Ulusoy, Özgür (ACM, 2013-10-11)
      In web query result caching, staleness of queries are often bounded via a time-to-live (TTL) mechanism, which expires the validity of cached query results at some point in time. In this work, we evaluate the performance ...
    • Timestamp-based cache invalidation for search engines 

      Alıcı, Sadiye; Altıngövde, İsmail Şengör; Özcan, Rıfat; Cambazoglu, B.B.; Ulusoy, Özgür (ACM, 2011)
      We propose a new mechanism to predict stale queries in the result cache of a search engine. The novelty of our approach is in the use of timestamps in staleness predictions. We show that our approach incurs very little ...
    • Turkish information retrieval: past changes future 

      Can, Fazlı (Springer, 2006-10)
      One of the most exciting accomplishments of computer science in the lifetime of this generation is the World Wide Web. The Web is a global electronic publishing medium. Its size has been growing with an enormous speed for ...
    • Utilization of navigational queries for result presentation and caching in search engines 

      Özcan, Rıfat; Altıngövde, İsmail Şengör; Ulusoy, Özgür (ACM, 2008-10)
      We propose result page models with varying granularities for navigational queries and show that this approach provides a better utilization of cache space and reduces bandwidth requirements.