Now showing items 1-20 of 30

    • An Adaptive System Identification Method Based on Bispectrum 

      Alshebeili, S.A.; Venetsanopoulos, A.N.; Enis Cetin, A. (1991)
      This paper presents a new adaptive technique for the identification of a linear system driven by white non-Gaussian noise. The system can be a non-minimum phase system. The adaptive identification technique is a least ...
    • Asymmetric light propagation in chirped photonic crystal waveguides 

      Kurt H.; Yilmaz, D.; Akosman, A.E.; Özbay, Ekmel (Optical Society of American (OSA), 2012)
      We report numerical and experimental investigations of asymmetric light propagation in a newly designed photonic structure that is formed by creating a chirped photonic crystal (PC) waveguide. The use of a non-symmetric ...
    • Compact wavelength de-multiplexer design using slow light regime of photonic crystal waveguides 

      Akosman, A.E.; Mutlu, M.; Kurt H.; Özbay, Ekmel (Optical Society of American (OSA), 2011)
      We demonstrate the operation of a compact wavelength demultiplexer using cascaded single-mode photonic crystal waveguides utilizing the slow light regime. By altering the dielectric filling factors of each waveguide segment, ...
    • Design and evaluation of a new transaction execution model for multidatabase systems 

      Devirmiş, T.; Ulusoy, Ö. (Elsevier, 1997)
      In this paper, we present a new transaction execution model that captures the formalism and semantics of various extended transaction models and adopts them to a multidatabase system (MDBS) environment. The proposed model ...
    • Direct volume rendering of unstructured grids 

      Berk, Hakan; Aykanat, Cevdet; Güdükbay, Uğur (Pergamon Press, 2003)
      This paper investigates three categories of algorithms for direct volume rendering of unstructured grids, which are image-space, object-space, and hybrid methods. We propose three new algorithms. Cell Projection algorithm, ...
    • Experimental observation of cavity formation in composite metamaterials 

      Caglayan H.; Bulu I.; Loncar, M.; Özbay, Ekmel (Optical Society of American (OSA), 2008)
      In this paper, we investigated one of the promising applications of left-handed metamaterials: composite metamaterial based cavities. Four different cavity structures operating in the microwave regime were constructed, and ...
    • A fast neural-network algorithm for VLSI cell placement 

      Aykanat, C.; Bultan, T.; Haritaoğlu, İ. (Pergamon Press, 1998)
      Cell placement is an important phase of current VLSI circuit design styles such as standard cell, gate array, and Field Programmable Gate Array (FPGA). Although nondeterministic algorithms such as Simulated Annealing (SA) ...
    • Foraging swarms as Nash equilibria of dynamic games 

      Özgüler, A. B.; Yildiz, A. (IEEE, 2014)
      The question of whether foraging swarms can form as a result of a noncooperative game played by individuals is shown here to have an affirmative answer. A dynamic game played by N agents in 1-D motion is introduced and ...
    • Hypergraph models and algorithms for data-pattern-based clustering 

      Ozdal, M. M.; Aykanat, C. (Springer, 2004)
      In traditional approaches for clustering market basket type data, relations among transactions are modeled according to the items occurring in these transactions. However, an individual item might induce different relations ...
    • Influence of phase function on modeled optical response of nanoparticle-labeled epithelial tissues 

      Cihan, C.; Arifler, D. (2011)
      Metal nanoparticles can be functionalized with biomolecules to selectively localize in precancerous tissues and can act as optical contrast enhancers for reflectance-based diagnosis of epithelial precancer. We carry out ...
    • Iterative disaggregation for a class of lumpable discrete-time stochastic automata networks 

      Gusak, O.; Dayar T.; Fourneau, J. M. (Elsevier, 2003)
      Stochastic automata networks (SANs) have been developed and used in the last 15 years as a modeling formalism for large systems that can be decomposed into loosely connected components. In this work, we concentrate on the ...
    • Light-induced pitch transitions in photosensitive cholesteric liquid crystals: Effects of anchoring energy 

      Orlova, T. N.; Iegorov, R. I.; Kiselev, A. D. (American Physical Society, 2014)
      We experimentally study how the cholesteric pitch P depends on the equilibrium pitch P0 in planar liquid crystal (LC) cells with both strong and semistrong anchoring conditions. The cholesteric phase was induced by dissolution ...
    • Metadata-based modeling of information resources on the web 

      Özel, S. A.; Altingövde, S.; Ulusoy, Ö.; Özsoyoǧlu G.; Özsoyoǧlu, Z. M. (Wiley, 2004)
      This paper deals with the problem of modeling Web information resources using expert knowledge and personalized user information for improved Web searching capabilities. We propose a "Web information space" model, which ...
    • A movable jaw model for the human face 

      Güdükbay U. (Pergamon Press, 1997)
      Although there is a great deal of work on facial animation, there is not much research on the effect of jaw motion on the movement of the face. The complex nature of the jaw bones makes it difficult to implement all the ...
    • Network access protocol for hard real-time communication systems 

      Ulusoy, Ö. (Elsevier, 1995)
      Distributed hard real-time systems are characterized by communication messages associated with timing constraints, typically in the form of deadlines. A message should be received at the destination before its deadline ...
    • A parallel progressive radiosity algorithm based on patch data circulation 

      Aykanat, C.; Çapin, T. K.; Özgüç, B. (Pergamon Press, 1996)
      Abstract - Current research on radiosity has concentrated on increasing the accuracy and the speed of the solution. Although algorithmic and meshing techniques decrease the execution time, still excessive computational ...
    • Parametric nonlinear lumped element model for circular CMUTs in collapsed mode 

      Aydoǧdu, E.; Ozgurluk, A.; Atalar, Abdullah; Köymen, H. (2014)
      We present a parametric equivalent circuit model for a circular CMUT in collapsed mode. First, we calculate the collapsed membrane deflection, utilizing the exact electrical force distribution in the analytical formulation ...
    • Piecewise linear asymptotic waveform evaluation for transient simulation of electronic circuits 

      Dikmen, C. T.; Alaybeyi, M. M.; Topcu, Satılmış; Atalar, Abdullah; Sezer, E.; Tan, Mehmet Ali; Rohrer, R. A. (IEEE, 1991-06)
      A general purpose circuit simulation program, PL-AWE (piecewise linear asymptotic waveform evaluator) is developed especially for the analysis of VLSI circuits. PL-AWE uses the asymptotic waveform evaluation (AWE) technique, ...
    • Polar optical phonon scattering and negative Kromer-Esaki-Tsu differential conductivity in bulk GaN 

      Bulutay, C.; Ridley, B. K.; Zakhleniuk, N. A. (Elsevier, 2001-09)
      GaN is being considered as a viable alternative semiconductor for high-power solid-state electronics. This creates a demand for the characterization of the main scattering channel at high electric fields. The dominant ...
    • Prosody-based automatic segmentation of speech into sentences and topics 

      Shriberg, E.; Stolcke, A.; Hakkani-Tür, D.; Tür, G. (Elsevier, 2000)
      A crucial step in processing speech audio data for information extraction, topic detection, or browsing/playback is to segment the input into sentence and topic units. Speech segmentation is challenging, since the cues ...