Search for dissertations about: "mean field annealing"

Found 5 swedish dissertations containing the words mean field annealing.

  1. 1. Variational Methods in Combinatorial Optimization and Phylogeny Reconstruction

    University dissertation from Dept. of Theoretical Physics, Sölvegatan 14A, S-223 62 Lund

    Author : Henrik Jönsson; Lunds universitet.; Lund University.; [2001]
    Keywords : gravitation; statistical physics; relativity; annealing; variational; mean-field; phylogeny; constraint satisfaction; combinatorial optimization; maximum likelihood; Physics; Fysik; Mathematical and general theoretical physics; quantum mechanics; classical mechanics; klassisk mekanik; kvantmekanik; relativitet; statistisk fysik; termodynamik; Fysicumarkivet A:2001:Jönsson; Matematisk och allmän teoretisk fysik; thermodynamics; Fysik; Physics;

    Abstract : Algorithms based on the variational approach, as used in statistical physics, are developed. For constraint satisfaction problems a novel cost function, based on information-theoretic arguments, is introduced, and an algorithm similar to the mean-field annealing algorithm is proposed. READ MORE

  2. 2. Active Noise Control of Enclosed Sound Fields Optimising the Performance

    University dissertation from Chalmers University of Technology

    Author : Per Sjösten; Chalmers tekniska högskola.; Chalmers University of Technology.; [2003]
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Samhällsbyggnadsteknik och arkitektur; Civil engineering and architecture; Teknisk mekanik; Engineering mechanics; active noise control; hybrid controller for anc; multiple-reference controller; complex lms; multiple-error algorithm; multichannel feedforward algorithm; fast feedforward algorithm; optimising actuator and sensor positions; simulated annealing; mean-field annealing;

    Abstract : Active noise control is the art of reducing a primary unwanted sound field by interference with an actively created secondary sound field. To achieve high reduction, it is crucial to obtain both temporal and spatial matching between the primary and the secondary sound fields. READ MORE

  3. 3. Neural Network Ensembles and Combinatorial Optimization with Applications in Medicine

    University dissertation from Department of Theoretical Physics

    Author : Henrik Haraldsson; Lunds universitet.; Lund University.; [2003]
    Keywords : machine learning; numerisk analys; artificial neural networks; ensemble methods; feature extraction; ECG; combinatorial optimization; mean field annealing; Computer science; numerical analysis; systems; Datalogi; control; system; kontroll; Artificial intelligens; Artificiell intelligens; Fysicumarkivet A:2003:Haraldsson; NATURVETENSKAP; NATURAL SCIENCES;

    Abstract : Artificial neural network (ANN) and combinatorial optimization algorithms are developed, and applied to the medical domain. A novel method for training an ensemble of ANN is presented, based on random weight updates alternated with replication of networks with low error. READ MORE

  4. 4. Molecular beam epitaxy growth and characterization of GaN, AlN and AlGaN/GaN heterostructures

    University dissertation from Chalmers University of Technology

    Author : Stefan Davidsson; Chalmers tekniska högskola.; Chalmers University of Technology.; [2005]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Fysik; Physics; Elektroteknik; elektronik och fotonik; Electrical engineering; electronics and photonics; III-nitride; GaN; AlN; AlGaN; sapphire; Al2< sub>O3< sub>; epitaxial growth; molecular beam epitaxy; MBE; nitridation; nucleation layer; buffer layer; two-dimensional electron gas; 2DEG; 2DEG density; 2DEG mobility; heterostructure field effect transistor; HFET;

    Abstract : The III-nitride materials, consisting of Al, Ga, In and N, have several physical properties that make them attractive for semiconductor devices in electronic and optic applications. A wide range of direct energy bandgaps (0.7 eV - 6.1 eV) can be obtained. READ MORE

  5. 5. Preparation and Characterization of the Magnetic Semiconductor (GaMn)As

    University dissertation from Chalmers University of Technology

    Author : Martin Adell; Chalmers tekniska högskola.; Chalmers University of Technology.; [2006]
    Keywords : NATURVETENSKAP; NATURAL SCIENCES; Halvledarfysik; Semiconductor physics;

    Abstract : The diluted ferromagnetic semiconductor (GaMn)As has been grown by low temperature molecular beam epitaxy and the effects of post growth treatments on the electronic, magnetic and structural properties have been studied. In situ low temperature annealing of (GaMn)As layers has been performed. READ MORE