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1. 1. Approximation problems and weights

   Författare :Adem Limani; Matematik (naturvetenskapliga fakulteten); []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; approximation problems; weights; Spaces of analytic functions;

   Sammanfattning : This thesis is mainly concerned with investigations of approximation problems on spaces of analytic functions on the unit disc in the complex plane, which naturally arise in connection to spectral problems of certain classes of linear operators acting on the spaces in question. For instance, quasi-nilpotency of certain analytic paraproducts on the Hardy spaces and on the Bergman spaces are investigated. LÄS MER

3. 2. Regularised Weights in Statistical Models

   Författare :Olof Zetterqvist; Chalmers tekniska högskola; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Lasso; Robust Statistics; Deep Learning; Weighted loss.; Noisy Labels; Neural Networks; Regularisation;

   Sammanfattning : For flexible and overparameterised models like neural networks, overfitting can be a notorious problem that makes it hard to give accurate predictions in real-life usage. Overfitting is in particular likely in the presence of errors in the training data, such as misclassifications or outliers. LÄS MER

4. 3. Mellan gåva och marknad : handel, tillit och materiell kultur under vikingatid

   Författare :Ingrid Gustin; Historisk arkeologi; []
   Nyckelord :HUMANIORA; HUMANITIES; Ancient history; contextual archaeology; identity; style; trust; iconicity; penannular brooches; weights; the Baltic Sea area; Birka; emporium; port-of-trade; Polanyi; exchange; Viking Age; trade; Antikens och forntidens historia; Archaeology; Arkeologi;

   Sammanfattning : The view of the exchange and trade that took place during the Viking Age has varied considerably. This variation is obvious from a scrutiny of how one and the same place, Birka, is described by different scholars over a period of a hundred years. LÄS MER

5. 4. Studies of some Operators of Harmonic Analysis in certain Function Spaces with Applications to PDEs

   Författare :Staffan Lundberg; Norway Narvik UiT The Arctic University of Norway Department of Computer Science and Computational Engineering Faculty of Science and Technology; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Operators; Hardy Operators; Potential Operators; Singular Operators; Function Spaces; Morrey Spaces; H¨older Spaces; Partial Differential Equations; Inequalities; Hardy Type Inequalities; Weights; Applications; Matematik; Mathematics;

   Sammanfattning : The study in this PhD thesis aims at development of certain mathematical methods used in applications, in particular, in the study of regularity properties of solutions in various mathematical models described by Partial Differential Equations (PDEs). To this end, we study various operators of harmonic analysis in certain function spaces, since solutions to many PDEs may be expressed in terms of such operators. LÄS MER

7. 5. Algorithms for overdetermined systems of equations

   Författare :Mårten Gulliksson; Umeå universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; least squares; weights; lp; approximation; optimization;

   Sammanfattning : .... LÄS MER