Sökning: "Dimensionality"

Visar resultat 1 - 5 av 201 avhandlingar innehållade ordet Dimensionality.

  1. 1. Online Dimensionality Reduction

    Författare :Kaito Ariu; Alexandre Proutiere; Mikael Johansson; Richard Combes; KTH; []

    Sammanfattning : In this thesis, we investigate online dimensionality reduction methods, wherethe algorithms learn by sequentially acquiring data. We focus on two specificalgorithm design problems in (i) recommender systems and (ii) heterogeneousclustering from binary user feedback. LÄS MER

  2. 2. Nonlinear dimensionality reduction of gene expression data

    Författare :Jens Nilsson; Matematik LTH; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Gene expression; Manifold learning; Nonlinear dimensionality reduction; Microarray;

    Sammanfattning : Using microarray measurements techniques, it is possible to measure the activity of genes simultaneously across the whole genome. Since genes influence each others activity levels through complex regulatory networks, such gene expression measurements are state samples of a dynamical system. LÄS MER

  3. 3. Breaking the Dimensionality Curse of Voronoi Tessellations

    Författare :Vladislav Polianskii; Florian T. Pokorny; Michael Bronstein; KTH; []
    Nyckelord :NATURAL SCIENCES; NATURVETENSKAP; NATURVETENSKAP; NATURAL SCIENCES; geometric methods; machine learning methods; Voronoi; Delaunay; high dimensional geometry; curse of dimensionality; monte carlo; Datalogi; Computer Science;

    Sammanfattning : Considering the broadness of the area of artificial intelligence, interpretations of the underlying methodologies can be commonly narrowed down to either a probabilistic or a geometric point of view. Such separation is especially prevalent in more classical "pre-neural-network" machine learning if one compares Bayesian modelling with more deterministic models like nearest neighbors. LÄS MER

  4. 4. Chemical Structure and Physical Properties of Organic-Inorganic Metal Halide Materials for Solid State Solar Cells

    Författare :Majid Safdari; James M. Gardner; Timothy Kelly; KTH; []
    Nyckelord :NATURAL SCIENCES; NATURVETENSKAP; Perovskite; Solar cells; Organic-inorganic lead halide; Dimensionality; Bandgap; X-ray diffraction; X-ray spectroscopy.; Kemi; Chemistry;

    Sammanfattning : AbstractMethylammonium lead (II) iodide has recently attracted considerable interest which may lead to substantial developments of efficient and inexpensive industrial photovoltaics. The application of this material as a light-absorbing layer in solid-state solar cells leads to impressive efficiency of over 22% in laboratory devices. LÄS MER

  5. 5. Parenting stress : Conceptual and methodological issues

    Författare :Monica Östberg; Uppsala universitet; []
    Nyckelord :SOCIAL SCIENCES; SAMHÄLLSVETENSKAP; Psychology; Parenting stress; dimensionality; validity; structural equation modeling; social support; infant temperament; responsiveness; Psykologi; Psychology; Psykologi; Psychology; psykologi;

    Sammanfattning : High parenting stress has been connected with negative consequences for both parent and child. The aim of the present thesis was to examine factors contributing to high stress, and to develop a psychometrically sound, reliable, and valid instrument for measuring parenting stress. LÄS MER