Browsing by Keywords "Functions"

Now showing items 1-20 of 34

    • Bessel functions-Based reconstruction of non-uniformly sampled diffraction fields 

      Uzunov, V.; Esmer, G. B.; Gotchev, A.; Onural, L.; Ozaktas, H. M. (2007)
      A discrete computational model for the diffraction process is essential in forward problems related to holographic TV. The model must be as general as possible, since the shape of the displayed objects does not bear any ...

    • Comparison of surface-modeling techniques 

      Sertel, K.; Gurel, L. (IEEE, Piscataway, NJ, United States, 1997)
      Solution techniques based on surface integral equations are widely used in computational electromagnetics. The accurate surface models increase the accuracy solutions by using exact and flat-triangulation models for a ...

    • Computationally efficient wavelet affine invariant functions for 2D object recognition 

      Bala, E.; Cetin, A. E. (IEEE, 2003)
      In this paper, an affine invariant function is presented for object recognition from wavelet coefficients of the object boundary. In previous works, undecimated wavelet transform was used for affine invariant functions. ...

    • Contact-free measurement of respiratory rate using infrared and vibration sensors 

      Erden, F.; Alkar, A. Z.; Cetin, A. E. (Elsevier BV, 2015)
      Respiratory rate is an essential parameter in many practical applications such as apnea detection, patient monitoring, and elderly people monitoring. In this paper, we describe a novel method and a contact-free multi-modal ...

    • Denoising using projections onto the epigraph set of convex cost functions 

      Tofighi, M.; Kose, K.; Cetin, A.E. (Institute of Electrical and Electronics Engineers Inc., 2014)
      A new denoising algorithm based on orthogonal projections onto the epigraph set of a convex cost function is presented. In this algorithm, the dimension of the minimization problem is lifted by one and feasibility sets ...

    • Economic design of EWMA control charts based on loss function 

      Serel, D. A. (Elsevier, 2009)
      For monitoring the stability of a process, various control charts based on exponentially weighted moving average (EWMA) statistics have been proposed in the literature. We study the economic design of EWMA-based mean and ...

    • An efficient method for electromagnetic characterization of 2-D geometries in stratified media 

      Aksun, M. I.; Çalışkan, F.; Gürel, L. (IEEE, 2002)
      A numerically efficient technique, based on the spectral-domain method of moments (MoM) in conjunction with the generalized pencil-of-functions (GPOF) method, is developed for the characterization of two-dimensional ...

    • Energetic efficient synthesis of general mutual intensity distribution 

      Zalevsky, Z.; Medlovic, D.; Ozaktas, H. M. (Institute of Physics Publishing, 2000)
      The mutual intensity distribution of a light beam may contain available information. The task of encoding a given mutual intensity distribution is addressed in this paper. Various approaches for encoding the mutual intensity ...

    • Exact calculation of blocking probabilities for bufferless optical burst switched links with partial wavelength conversion 

      Akar, N.; Karasan, E. (2004)
      In this paper, we study the blocking probabilities in a wavelength division multiplexing-based asynchronous bufferless optical burst switch equipped with a bank of tuneable wavelength converters that is shared per output ...

    • The fractional Fourier transform and its applications to image representation and beamforming 

      Yetik I.S.; Kutay, M.A.; Ozaktas, H., M. (2003)
      The ath order fractional Fourier transform operator is the ath power of the ordinary Fourier transform operator. We provide a brief introduction to the fractional Fourier transform, discuss some of its more important ...

    • Guessing subject to distortion 

      Arikan, E.; Merhav, N. (Institute of Electrical and Electronics Engineers, 1998-05)
      We investigate the problem of guessing a random vector X within distortion level D. Our aim is to characterize the best attainable performance in the sense of minimizing, in some probabilistic sense, the number of required ...

    • Improving the accuracy of the MFIE with the choice of basis functions 

      Ergül Ö.; Gürel, L. (2004)
      The accuracy of the magnetic-field integral equation (MFIE) for the Method of Moments (MOM) and fast-multiple-method (FMM) solutions of the electromagnetic scattering problems modeled by abitrary planar triangulations is ...

    • 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 ...

    • An inventory problem with two randomly available suppliers 

      Gürler, Ü.; Parlar, M. (Institute for Operations Research and the Management Sciences, 1997)
      This paper considers a stochastic inventory model in which supply availability is subject to random fluctuations that may arise due to machine breakdowns, strikes, embargoes, etc. It is assumed that the inventory manager ...

    • Investigation of the inaccuracy of the MFIE discretized with the RWG basis functions 

      Ergül Ö.; Gürel, L. (2004)
      The inaccuracy of the magnetic-field integral equation (MFIE) discretized with the Rao-Wilton-Glisson (RWG) basis functions is discussed. The electric-field integral equation (EFIE) gives accurate results with the usage ...

    • Joint source-channel coding and guessing 

      Arikan Erdal, Merhav Neri (IEEE, Piscataway, NJ, United States, 1997)
      We consider the joint source-channel guessing problem, define measures of optimum performance, and give single-letter characterizations. As an application, sequential decoding is considered.

    • Language evolution and information theory 

      Ahlswede, R.; Arikan, E.; Bäumer L.; Deppe, C. (2004)
      The use of Nowak's model to study the language evolution and to settle a conjecture by Nowak was discussed. These models explained the ways by which natural selection can lead to the gradual emergence of human language. ...

    • Marginal allocation algorithm for nonseparable functions 

      Yüceer, Ü. (Taylor & Francis, 1999)
      Marginal allocation algorithm is implemented to discrete allocation problems with nonseparable objective functions subject to a single linear constraint. A Lagrangian analysis shows that the algorithm generates a sequence ...

    • Minimizing Lmax for the single machine scheduling problem with family set-ups 

      Schultz, S. R.; Hodgson, T. J.; King, R. E.; Taner, M. R. (Taylor & Francis, 2004)
      A procedure for the single machine-scheduling problem of minimizing the maximum lateness for jobs with sequence independent set-ups is presented. The procedure provides optimal/near-optimal solutions over a wide range of ...

    • New characterizations of ℓ1 solutions to overdetermined systems of linear equations 

      Madsen, K.; Nielsen H. B.; Pınar, M. Ç. (Elsevier, 1994)
      New characterizations of the ℓ1 solutions to overdetermined system of linear equations are given. The first is a polyhedral characterization of the solution set in terms of a special sign vector using a simple property of ...