Now showing items 1-20 of 33

    • Adaptive power control and MMSE interference suppression 

      Ulukus, S.; Yates, R.D. (1998)
      Power control algorithms assume that the receiver structure is fixed and iteratively update the transmit powers of the users to provide acceptable quality of service while minimizing the total transmitter power. Multiuser ...
    • Algebraic error analysis of collinear feature points for camera parameter estimation 

      Urfalioglu, O.; Thormählen, T.; Broszio, H.; Mikulastik, P.; Cetin, A. E. (Elsevier, 2011-01-04)
      In general, feature points and camera parameters can only be estimated with limited accuracy due to noisy images. In case of collinear feature points, it is possible to benefit from this geometrical regularity by correcting ...
    • Application of signal-processing techniques to reduce the errors related to the FDTD excitations 

      Gürel, L.; Oǧuz, U. (2001)
      A study on the reduction of the errors related to the finite-difference time-domain (FDTD) excitations was performed by employing signal-processing techniques. Plane-wave scattering problems were simulated. The improvements ...
    • Capacity bounds for an ultra-wideband channel model 

      Ankan, E. (2004)
      There is an ongoing effort by the IEEE 802.15.3a subcommittee to reach a UWB personal area network standard. We estimate the achievable rates for such networks using a channel model specified by the same group. The analysis ...
    • Competitive linear MMSE estimation under structured data uncertainties 

      Denizcan Vanli, N.; Sayin, M.Ö.; Kozat, S.S. (IEEE Computer Society, 2014)
      In this paper, we consider the linear estimation problem under structured data uncertainties. A robust algorithm is presented under bounded uncertainties under the mean square error (MSE) criterion. The performance of the ...
    • EFIE and MFIE, why the difference? 

      Chew W.C.; Davis, C.P.; Warnick, K.F.; Nie, Z.P.; Hu J.; Yan, S.; Gürel, L. (2008)
      EFIE (electric field integral equation) suffers from internal resonance, and the remedy is to use MFIE (magnetic field integral equation) to come up with a CFIE (combined field integral equation) to remove the internal ...
    • Error control in MLFMA with multiple-precision arithmetic 

      Kalfa, M.; Ergül, Ö.; Ertürk, V. B. (Institution of Engineering and Technology, 2018)
      We present a new error control method that provides the truncation numbers as well as the required digits of machine precision for the translation operator of the multilevel fast multipole algorithm (MLFMA). The proposed ...
    • Error control of multiple-precision MLFMA 

      Kalfa, M.; Ergül, Ö.; Ertürk, V. B. (Institute of Electrical and Electronics Engineers, 2018)
      We introduce and demonstrate a new error control scheme for the computation of far-zone interactions in the multilevel fast multipole algorithm when implemented within a multiple-precision arithmetic framework. The proposed ...
    • Evaluating predictive performance of judgemental extrapolations from simulated currency series 

      Pollock, A. C.; Macaulay, A.; Önkal-Atay, D.; Wilkie-Thomson, M. E. (Elsevier, 1999)
      Judgemental forecasting of exchange rates is critical for financial decision-making. Detailed investigations of the potential effects of time-series characteristics on judgemental currency forecasts demand the use of ...
    • A fast algorithm for subpixel accuracy image stabilization for digital film and video 

      Eroǧlu Ç.; Erdem, A.T. (1998)
      This paper introduces a novel method for subpixel accuracy stabilization of unsteady digital films and video sequences. The proposed method offers a near-closed-form solution to the estimation of the global subpixel ...
    • Fast processing techniques for accurate ultrasonic range measurements 

      Barshan, B. (Institute of Physics Publishing, 2000)
      Four methods of range measurement for airborne ultrasonic systems - namely simple thresholding, curve-fitting, sliding-window, and correlation detection - are compared on the basis of bias error, standard deviation, total ...
    • Fractional Fourier transform pre-processing for neural networks and its application to object recognition 

      Barshan, B.; Ayrulu, B. (Pergamon Press, 2002)
      This study investigates fractional Fourier transform pre-processing of input signals to neural networks. The fractional Fourier transform is a generalization of the ordinary Fourier transform with an order parameter a. ...
    • A hybrid reconstruction algorithm for computerized ionospheric tomography 

      Yavuz, E.; Ankan F.; Ankan O. (2005)
      Computerized Ionospheric Tomography (CIT) is a method to reconstruct ionospheric electron density images by using the Global Positioning System data collected by the earth based receivers. In this study, Total Electron ...
    • Influence function based Gaussianity tests for detection of microcalcifications in mammogram images 

      Gürcan, M. N.; Yardımcı, Y.; Çetin, A. E. (IEEE, Los Alamitos, CA, United States, 1999)
      In this paper, computer-aided diagnosis of microcalcifications in mammogram images is considered. Microcalcification clusters are an early sign of breast cancer. Microcalcifications appear as single bright spots in mammogram ...
    • Is there a flight to quality due to inflation uncertainty? 

      Guler, B.; Ozlale, U. (Elsevier BV, 2005)
      After two types of inflation uncertainty are derived within a time-varying parameter model with GARCH specification, the relationship between inflation uncertainty and interest rates for safe assets is investigated. The ...
    • Joint estimation and optimum encoding of depth field for 3-D object-based video coding 

      Alatan, A.Aydin, Onural Levent (IEEE, Los Alamitos, CA, United States, 1996)
      3-D motion models can be used to remove temporal redundancy between image frames. For efficient encoding using 3-D motion information, apart from the 3-D motion parameters, a dense depth field must also be encoded to achieve ...
    • Joint source-channel coding and guessing with application to sequential decoding 

      Arikan, E.; Merhav, N. (Institute of Electrical and Electronics Engineers, 1998-09)
      We extend our earlier work on guessing subject to distortion to the joint source-channel coding context. We consider a system in which there is a source connected to a destination via a channel and the goal is to reconstruct ...
    • Keyframe reduction techniques for motion capture data 

      Önder O.; Güdükbay U.; Özgüç, B.; Erdem, T.; Erdem Ç.; Özkan, M. (2008)
      Two methods for keyframe reduction of motion capture data are presented. Keyframe reduction of motion capture data enables animators to easily edit motion data with smaller number of keyframes. One of the approaches achieves ...
    • Lattice dynamics and elastic properties of lanthanum monopnictides 

      Gökoǧlu G.; Erkişi, A. (2008)
      In this study, first principles calculation results of the second order elastic constants and lattice dynamics of two lanthanum monopnictides, LaN and LaBi, which crystallize in rock-salt structure (B1 phase), are presented. ...
    • Lens or resonator? Electromagnetic behavior of an extended hemielliptic lens for a sub-millimeter-wave receiver 

      Boriskin, A. V.; Nosich, A. I.; Boriskina, S. V.; Benson, T. M.; Sewell, P.; Altintas, A. (John Wiley & Sons, 2004)
      The behavior of a 2D model of an extended hemielliptic silicon lens of a size typical for THz applications is accurately studied for the case of a plane E-wave illumination. The full-wave analysis of the scattering problem ...