Now showing items 21-36 of 36

    • Nonlinear PDE control of two-link flexible arm with nonuniform cross section 

      Dog̃an, M.; Morgül Ö. (2006)
      A two-link flexible arm with nonuniform or variable cross-section by design will be considered based on an exact PDE model with boundary conditions. In this research, the nonlinear controller is used to achieve set-point ...
    • On the optimality of the window method in computational homogenization 

      Temizer, I.; Wu, T.; Wriggers, P. (2013)
      The window method, where the microstructural sample is embedded into a frame of a homogeneous material, offers an alternative to classical boundary conditions in computational homogenization. Experience with the window ...
    • Phonon confinement and screening effects on the polaron energy in quantum wires 

      Tanatar, B.; Guven, K. (Institute of Physics Publishing Ltd., 1995)
      We study the contribution of confined phonons to the polaron energy in quantum-well wires. We use a dispersionless, macroscopic continuum model to describe the phonon confinement in quantum wires of square cross section. ...
    • Proper orthogonal decomposition for reduced order modeling: 2D heat flow 

      Efe, M.O.; Özbay H. (2003)
      Modeling issues of infinite dimensional systems is studied in this paper. Although the modeling problem has been solved to some extent, use of decomposition techniques still pose several difficulties. A prime one of this ...
    • Quantitative comparison of rooftop and RWG basis functions 

      Gürel, L.; Şendur, I. K.; Sertel, K. (IEEE, Piscataway, NJ, United States, 1997)
      The `rooftops' (RT) basis functions (BFs) are well suited for the modeling of geometries that conform to Cartesian coordinates, whereas the Rao, Wilton, and Glisson subdomains (RWG) BFs are capable of modeling flat-faceted ...
    • Simulation of TRT-configured ground-penetrating radars over heterogeneous grounds 

      Oǧuz, U.; Gürel, L. (2001)
      The simulation of transmitter-reciever-transmitter (TRT) configured ground-penetrating radars over heterogeneous grounds was discussed. The finite-difference time-domain (FDTD) methods along with the perfectly-matched layer ...
    • Smart radome improves reflector antenna directivity 

      Nosich, A.; Altintaş, A.; Yurchenko, V. (IEEE (Institute of Electrical and Electronics Engineers), 1997)
      A numerical optimization procedure is applied to two dimensional model of cylindrical reflector antenna arbitrarily located inside a circular cylindrical dielectric radome. If the radome thickness has been optimized, then ...
    • Stabilization and disturbance rejection for the beam equation 

      Morgül, Ö. (IEEE, Orlando, FL, USA, 2001)
      We consider a system described by the Euler-Bernoulli beam equation in a bounded domain with appropriate boundary conditions. To stabilize the system, we propose a dynamic boundary controller applied at the free end of the ...
    • Stabilization and disturbance rejection for the wave equation 

      Morgül, Ö. (Institute of Electrical and Electronics Engineers, 1998-01)
      We consider a system described by the one-dimensional linear wave equation in a bounded domain with appropriate boundary conditions. To stabilize the system, we propose a dynamic boundary controller applied at the free end ...
    • Stabilization and disturbance rejection for the wave equation 

      Morgul Omer (IEEE, Piscataway, NJ, United States, 1994)
      We consider a system described by the one dimensional linear wave equation in a bounded domain with appropriate boundary conditions. To stabilize the system, we propose a dynamic boundary controller applied at the free end ...
    • Subsurface-scattering calculations via the 3D FDTD method employing PML ABC for layered media 

      Oğuz, U.; Gürel, L. (IEEE, Piscataway, NJ, United States, 1997)
      A three-dimensional finite-difference time-domain method that employs pure scattered-field formulation and perfectly matched layers (PML) as the absorbing boundary condition is developed for solving subsurface-scattering. ...
    • Test of accuracy of the generalized boundary conditions in the scattering by thin dielectric strips 

      Nosich, A.I.; Shapoval O.V.; Sukharevsky I.O.; Altintas, A. (Institute of Electrical and Electronics Engineers Inc., 2014)
      The two-dimensional (2D) scattering of the E and H-polarized plane electromagnetic waves by a free-standing thinner than the wavelength dielectric strip is considered numerically. Two methods are compared: singular integral ...
    • Three-dimensional FDTD modeling of a GPR 

      Uğur, O.; Gürel, L. (IEEE, 2000)
      The power and flexibility of the Finite-Difference Time-Domain (FDTD) method are combined with the accuracy of the perfectly-matched layer (PML) absorbing boundary conditions to simulate realistic ground-penetrating radar ...
    • Three-dimensional FDTD modeling of a ground-penetrating radar 

      Gürel, L.; Oğuz, U. (IEEE, 2000)
      The finite-difference time-domain (FDTD) method is used to simulate three-dimensional (3-D) geometries of realistic ground-penetrating radar (GPR) scenarios. The radar unit is modeled with two transmitters and a receiver ...
    • Transmitter-receiver-transmitter configurations of ground-penetrating radar 

      Gürel, L.; Oğuz, U. (Wiley-Blackwell Publishing, Inc., 2002)
      Three-dimensional ground-penetrating radar (GPR) geometries are simulated using the finite difference time domain (FDTD) method. The GPR is modeled with a receiver and two transmitters with arbitrary polarizations in order ...
    • Transmitter-receiver-transmitter-configured ground-penetrating radars over randomly heterogeneous ground models 

      Gürel, L.; Oğuz, U. (Wiley-Blackwell Publishing, Inc., 2002)
      Ground-penetrating radar (GPR) problems are simulated using the finite-difference time-domain (FDTD) method. The GPR model is configured with arbitrarily polarized three antennas, two of which are transmitting antennas fed ...