Now showing items 1-20 of 29

    • Adaptive OFDM modulation for underwater acoustic communications: Design considerations and experimental results 

      Radosevic, A.; Ahmed, R.; Duman, T. M.; Proakis, J. G.; Stojanovic, M. (Institute of Electrical and Electronics Engineers Inc., 2014)
      In this paper, we explore design aspects of adaptive modulation based on orthogonal frequency-division multiplexing (OFDM) for underwater acoustic (UWA) communications, and study its performance using real-time at-sea ...
    • Analysis of the generation of amplitude-squeezed light with Gaussian-beam degenerate optical parametric amplifiers 

      Köprülü, K. G.; Aytür, O. (OSA Publishing, 2001-06)
      We investigate the generation of amplitude-squeezed states with degenerate optical parametric amplifiers that are pumped by focused Gaussian beams. We present a model that facilitates the calculation of the squeezing level ...
    • 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 ...
    • Content-based retrieval of news videos using relevance feedback 

      Çavuş Ö.; Aksoy, S. (2006)
      Content-based retrieval in news video databases has become an important task with the availability of large quantities of data in both public and proprietary archives. We describe a relevance feedback technique that captures ...
    • Dimensioning shared-per-node recirculating fiber delay line buffers in an optical packet switch 

      Akar, N.; Gunalay, Y. (Elsevier, 2013)
      Optical buffering based on fiber delay lines (FDLs) has been proposed as a means for contention resolution in an optical packet switch. In this article, we propose a queuing model for feedback-type shared-per-node recirculating ...
    • 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 ...
    • The effects of feedback on judgmental interval predictions 

      Bolger, F.; Önkal-Atay, D. (Elsevier, 2004)
      The majority of studies of probability judgment have found that judgments tend to be overconfident and that the degree of overconfidence is greater the more difficult the task. Further, these effects have been resistant ...
    • Feedback-labelling synergies in judgmental stock price forecasting 

      Goodwin, P.; Önkal-Atay, D.; Thomson, M. E.; Pollock, A. C.; Macaulay, A. (Elsevier, 2004)
      Research has suggested that outcome feedback is less effective than other forms of feedback in promoting learning by users of decision support systems. However, if circumstances can be identified where the effectiveness ...
    • Feedforward and feedback processes in vision 

      Kafaligonul H.; Breitmeyer B.G.; Öğmen H. (Frontiers Research Foundation, 2015)
      [No abstract available]
    • The influence of early efficacy beliefs on teams' reactions to failing to reach performance goals 

      Porter, C. O. L. H.; Gogus, I.; Yu, R. C. F. (Blackwell Publishing Ltd, 2011)
      Although a considerable amount of theoretical and empirical attention has been devoted to understanding individuals' responses to goal–performance discrepancies (GPDs), little attention has been devoted to examining how ...
    • Intracavity optical trapping with fiber laser 

      Kalantarifard, Fatemeh (Bilkent University, 2019-06)
      After Ashkin's seminal works, optical trapping has been a powerful technique for capturing and manipulating sub micro particles not only in physics research fields but also in biology and photonics. Standard optical ...
    • Intracavity optical trapping with ytterbium doped fiber 

      Laser, R.; Sayed, R.; Kalantarifard F.; Elahi P.; Ilday F.O.; Volpe G.; Marago O.M. (2013)
      We propose a novel approach for trapping micron-sized particles and living cells based on optical feedback. This approach can be implemented at low numerical aperture (NA=0.5, 20X) and long working distance. In this ...
    • Lexical cohesion and term proximity in document ranking 

      Vechtomova, O.; Karamuftuoglu, M. (Elsevier Ltd, 2008-07)
      We demonstrate effective new methods of document ranking based on lexical cohesive relationships between query terms. The proposed methods rely solely on the lexical relationships between original query terms, and do not ...
    • Model based anticontrol of chaos 

      Morgül, Ö. (Institute of Electrical and Electronics Engineers Inc., 2003)
      We will consider model based anticontrol of chaotic systems. We consider both continuous and discrete time cases. We first assume that the systems to be controlled are linear and time invariant. Under controllability ...
    • A model-based scheme for anticontrol of some chaotic systems 

      Morgül, Ö. (World Scientific Publishing, 2003)
      We consider a model-based approach for the anticontrol of some continuous time systems. We assume the existence of a chaotic model in an appropriate form. By using a suitable input, we match the dynamics of the controlled ...
    • Observation of polarized gain from aligned colloidal nanorods 

      Gao, Y.; Ta, V. D.; Zhao, X.; Wang Y.; Chen R.; Mutlugün, E.; Fong, K. E.; Tan S.T.; Dang C.; Sun, X. W.; Sun, H.; Demir, H. V. (Royal Society of Chemistry, 2015)
      In recent years, colloidal semiconductor nanorods have attracted great interest for polarized spontaneous emission. However, their polarized gain has not been possible to achieve so far. In this work we show the highly ...
    • On the mixed sensitivity minimization for systems with infinitely many unstable modes 

      Gümüşsoy, S.; Özbay, H. (Elsevier, 2004)
      In this note we consider a class of linear time invariant systems with infinitely many unstable modes. By using the parameterization of all stabilizing controllers and a data transformation, we show that ℋ ∞ controllers ...
    • On the stabilization and stability robustness against small delays of some damped wave equations 

      Morgül, O. (IEEE, 1995)
      In this note we consider a system which can be modeled by two different one-dimensional damped wave equations in a bounded domain, both parameterized by a nonnegative damping constant. We assume that the system is fixed ...
    • On the stabilization of a flexible beam with a tip mass 

      Conrad, F.; Morgül, Ö. (Society for Industrial and Applied Mathematics, 1998-11)
      We study the stability of a flexible beam that is clamped at one end and free at the other; a mass is also attached to the free end of the beam. To stabilize this system we apply a boundary control force at the free end ...
    • Online cross-layer learning in heterogeneous cognitive radio networks without CSI 

      Qureshi, M. A.; Tekin, C. (Institute of Electrical and Electronics Engineers, 2018)
      We propose a contextual multi-armed bandit (CMAB) model for cross-layer learning in heterogeneous cognitive radio networks (CRNs). We consider the scenario where application adaptive modulation (AAM) is implemented in the ...