Sökning: "a posteriori error estimation"

Visar resultat 1 - 5 av 30 avhandlingar innehållade orden a posteriori error estimation.

  1. 1. Time-domain Reconstruction Methods for Ultrasonic Array Imaging : A Statistical Approach

    Detta är en avhandling från Uppsala : Signaler och System

    Författare :Fredrik Lingvall; Uppsala universitet.; [2004]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Signalbehandling; Ultrasonic array imaging; synthetic aperture imaging; maximum a posteriori estimation; linear minimum mean squared error estimation; SAFT; Bayesian image reconstruction; Signalbehandling; TECHNOLOGY Information technology Signal processing; TEKNIKVETENSKAP Informationsteknik Signalbehandling; Signal Processing; signalbehandling;

    Sammanfattning : This thesis is concerned with reconstruction techniques for ultrasonic array imaging based on a statistical approach. The reconstruction problem is posed as the estimation of an image consisting of scattering strengths. LÄS MER

  2. 2. On A Posteriori Error Estimation in the Maximum Norm

    Detta är en avhandling från Göteborg : Chalmers University of Technology

    Författare :Mats Boman; Göteborgs universitet.; Gothenburg University.; [2000]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES;

    Sammanfattning : In this thesis we consider residual-based a posteriori error estimates in the maximum norm for the finite element solution of some partial differential equations. The thesis consists of three papers. The first paper concerns a pointwise a posteriori error estimate for the time dependent obstacle problem. LÄS MER

  3. 3. On adaptive finite element methods based on a posteriori estimates

    Detta är en avhandling från Göteborg : Chalmers University of Technology

    Författare :Axel Målqvist; Göteborgs universitet.; Gothenburg University.; [2004]
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; finite element method; Galerkin; duality; a posteriori error estimation; adaptivity; Poisson equation; boundary penalty method; Helmholtz equation; pollution; variational multiscale method;

    Sammanfattning : .... LÄS MER

  4. 4. Maximum a posteriori deconvulution of ultrasonic data with applications in nondestructive testing : Multiple transducer and robustness is

    Detta är en avhandling från Uppsala : Acta Universitatis Upsaliensis

    Författare :Tomas Olofsson; Uppsala universitet.; [2000]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Materials science; Ultrasonic pulse-echo testing; nondestructive testing; maximum a posteriori estimation; linear minimum mean squared error estimation; robust filtering; multivariable filtering; sparse deconvolution; Materialvetenskap; TECHNOLOGY Materials science; TEKNIKVETENSKAP Teknisk materialvetenskap; Signal Processing; signalbehandling;

    Sammanfattning : In the thesis, various aspects of deconvolution of ultrasonic pulse-echo signals in nondestructive testing are treated. The deconvolution problem is formulated as estimation of a reflection sequence which is the impulse characteristic of the inspected object and the estimation is performed using either maximum a posteriori (MAP) or linear minimum mean square error (MMSE) estimators. LÄS MER

  5. 5. State Estimation for Distributed and Hybrid Systems

    Detta är en avhandling från Department of Automatic Control, Lund Institute of Technology, Lund University

    Författare :Peter Alriksson; Lunds universitet.; Lund University.; [2008]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Joint Maximum a Posteriori Estimation; Sensor Networks; Distributed State Estimation; Networked Embedded Systems; Markov Jump Linear Systems; Sensor Scheduling;

    Sammanfattning : This thesis deals with two aspects of recursive state estimation: distributed estimation and estimation for hybrid systems. In the first part, an approximate distributed Kalman filter is developed. Nodes update their state estimates by linearly combining local measurements and estimates from their neighbors. LÄS MER