Now showing items 1-20 of 20

    • Adaptive source routing in multistage interconnection networks 

      Aydoğan, Yücel; Stunkel, C. B.; Aykanat, Cevdet; Abali, B. (IEEE, 1996-04)
      We describe the adaptive source routing (ASR) method which is a first attempt to combine adaptive routing and source routing methods. In ASR, the adaptivity of each packet is determined at the source processor. Every packet ...
    • Analysis of concurrency control protocols for real-time database systems 

      Ulusoy, Ö. (Elsevier, 1998)
      This paper provides an approximate analytic solution method for evaluating the performance of concurrency control protocols developed for real-time database systems (RTDBSs). Transactions processed in a RTDBS are associated ...
    • 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 ...
    • Cluster based collaborative filtering with inverted indexing 

      Subakan, Özlem Nurcan (Bilkent University, 2005)
      Collectively, a population contains vast amounts of knowledge and modern communication technologies that increase the ease of communication. However, it is not feasible for a single person to aggregate the knowledge of ...
    • Comparative analysis of power consumption in asynchronous wavelength modular optical switching fabrics 

      Akar, N.; Eramo, V.; Raffaelli, C. (Elsevier, 2011-04-02)
      Next-generation optical routers will be designed to support the flexibility required by Future Internet services and, at the same time, to overcome the power consumption bottleneck which appears to limit throughput scalability ...
    • A comparison of epidemic algorithms in wireless sensor networks 

      Akdere, M.; Bilgin, C. C.; Gerdaneri, O.; Korpeoglu, I.; Ulusoy, O.; Çetintemel, U. (Elsevier BV, 2006-08-21)
      We consider the problem of reliable data dissemination in the context of wireless sensor networks. For some application scenarios, reliable data dissemination to all nodes is necessary for propagating code updates, queries, ...
    • Counteracting free riding in Peer-to-Peer networks 

      Karakaya, M.; Körpeoǧlu, I.; Ulusoy, O. (Elsevier BV, 2008-03)
      The existence of a high degree of free riding is a serious threat to Peer-to-Peer (P2P) networks. In this paper, we propose a distributed framework to reduce the adverse effects of free riding on P2P networks. Our solution ...
    • The general behavior of pull production systems: the allocation problems 

      Kırkavak, N.; Dinçer, C. (Elsevier, 1999)
      The design of tandem production systems has been well studied in the literature with the primary focus being on how to improve their e ciency. Considering the large costs associated, a slight improvement in e ciency can ...
    • Generic text summarization for Turkish 

      Kutlu, M.; Cığır, C.; Cicekli, I. (Oxford University Press, 2010)
      In this paper, we propose a generic text summarization method that generates summaries of Turkish texts by ranking sentences according to their scores. Sentence scores are calculated using their surface-level features, and ...
    • Land cover classification with multi-sensor fusion of partly missing data 

      Aksoy, S.; Koperski, K.; Tusk, C.; Marchisio, G. (American Society for Photogrammetry and Remote Sensing, 2009-05)
      We describe a system that uses decision tree-based tools for seamless acquisition of knowledge for classification of remotely sensed imagery. We concentrate on three important problems in this process: information fusion, ...
    • New event detection using chronological term ranking 

      Bağlıoğlu, Özgür (Bilkent University, 2009)
      News web pages are an important resource for news consumers since the Internet provides the most up-to-date information. However, the abundance of this information is overwhelming. In order to solve this problem, news ...
    • nOBS: an ns2 based simulation tool for performance Evaluation of TCP Traffic in OBS networks 

      Gurel, G.; Alparslan, O.; Karasan, E. (Springer-Verlag France, 2007)
      Performance evaluation of TCP traffic in OBS networks has been under intensive study, since TCP constitutes the majority of Internet traffic. As a reliable and publicly available simulator, ns2 has been widely used for ...
    • Optimization of F2 layer parameters using IRI-Plas model and IONOLAB Total Electron Content 

      Sahin O.; Sezen, U.; Arikan F.; Arıkan, Orhan; Aktug, B. (IEEE, 2011)
      In this study, the relation of the maximum ionization height (HmF2) and the critical frequency (FoF2) of F2 layer is examined within their parametric range through the International Reference Ionosphere extended towards ...
    • A performance evaluation framework of a rate-controlled MPEG video transmission over UMTS networks 

      Akar, Nail; Barbera, M.; Budzisz, L.; Ferrùs, R.; Kankaya, Emre; Schembra, G. (IEEE, 2007-07)
      UMTS is designed to offer high bandwidth radio access with QoS assurances for multimedia communications. In particular, real-time video communications services are expected to become a successful experience under UMTS ...
    • A performance evaluation model for distributed real-time database 

      Ulusoy, Ö.; Belford, G. G. (Taylor & Francis Group, 1995)
      A real-time database system (RTDBS) is designed to provide timely response to the transactions of data-intensive applications. Each transaction processed in an RTDBS is associated with a timing constraint in the form ...
    • Performance evaluation models for single-item periodic pull production systems 

      Kırkavak, N.; Dinçer, C. (Palgrave Macmillan, 1996)
      A number of pull production systems reported in the literature are found to be equivalent to a tandem- queue so that existing accurate tandem-queue approximation methods can be used to evaluate such systems. In this study, ...
    • Performance evaluation of track association and maintenance for a MFPAR with doppler velocity measurements 

      Kural, F.; Arikan, F.; Arikan, O.; Efe, M. (2010)
      This study investigates the effects of incorporating Doppler velocity measurements directly into track association and maintenance parts for single and multiple target tracking unit in a multi function phased array radar ...
    • Performance measures for object detection evaluation 

      Özdemir, B.; Aksoy, S.; Eckert, S.; Pesaresi, M.; Ehrlich, D. (Elsevier BV, 2010)
      We propose a new procedure for quantitative evaluation of object detection algorithms. The procedure consists of a matching stage for finding correspondences between reference and output objects, an accuracy score that is ...
    • Processing real-time transactions in a replicated database system 

      Ulusoy, Ö. (Springer/Kluwer Academic Publishers, 1994)
      A database system supporting a real-time application has to provide real-time information to the executing transactions. Each real-time transaction is associated with a timing constraint, typically in the form of a deadline. ...
    • Real-time transaction scheduling in database systems 

      Ulusoy, Ö.; Belford, G. G. (1993)
      A database system supporting a real-time application, which can be called "a real-time database system (RTDBS)", has to provide real-time information to the executing transactions. Each RTDB transaction is associated with ...