Sökning: "Spatial mixture model"

Visar resultat 1 - 5 av 39 avhandlingar innehållade orden Spatial mixture model.

  1. 1. On flexible random field models for spatial statistics: Spatial mixture models and deformed SPDE models

    Författare :Anders Hildeman; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Spatial statistics; Significant wave height; Spatial mixture model; Stochastic partial differential equation; Log-Gaussian Cox process; Point process; Gaussian random field; Substitute-CT;

    Sammanfattning : Spatial random fields are one of the key concepts in statistical analysis of spatial data. The random field explains the spatial dependency and serves the purpose of regularizing interpolation of measured values or to act as an explanatory model. LÄS MER

  3. 2. Spatial Mixture Models with Applications in Medical Imaging and Spatial Point Processes

    Författare :Anders Hildeman; Göteborgs universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Non-Gaussian; Bayesian level set inversion; Point processes; Substitute CT; Finite mixture models; Spatial statistics; Gaussian fields; Non-Gaussian;

    Sammanfattning : Finite mixture models have proven to be a great tool for both modeling non-standard probability distributions and for classification problems (using the latent variable interpretation). In this thesis we are building spatial models by incorporating spatially dependent categorical latent random fields in a hierarchical manner similar to that of finite mixture models. LÄS MER

  4. 3. Statistical methods in medical image estimation and sparse signal recovery

    Författare :Fekadu Lemessa Bayisa; Jun Yu; Ottmar Cronie; Henning Omre; Umeå universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Computed tomography; magnetic resonance imaging; Gaussian mixture model; skew-Gaussian mixture model; hidden Markov random field; hidden Markov model; supervised statistical learning; synthetic CT images; pseudo-CT images; spike and slab prior; adaptive algorithm;

    Sammanfattning : This thesis presents work on methods for the estimation of computed tomography (CT) images from magnetic resonance (MR) images for a number of diagnostic and therapeutic workflows. The study also demonstrates sparse signal recovery method, which is an intermediate method for magnetic resonance image reconstruction. LÄS MER

  5. 4. Powder mechanics and dispersion properties of adhesive mixtures for dry powder inhalers : Conceptualized as a blend state model

    Författare :Jonas Rudén; Göran Alderborn; Göran Frenning; Tobias Bramer; Kyrre Thalberg; Regina Scherliess; Uppsala universitet; []
    Nyckelord :MEDICIN OCH HÄLSOVETENSKAP; MEDICAL AND HEALTH SCIENCES; Inhalation; Dry Powder Inhaler; adhesive mixture; aerosols; powder mechanics; dispersibility; aerosolization; Farmaceutisk vetenskap; Pharmaceutical Science;

    Sammanfattning : Inhaled medicines is a therapy that dates back several thousands of years. Nowadays, using various types of inhaler devices to deliver active pharmaceutical ingredients (APIs) to treat respiratory diseases has become common practice. LÄS MER

  7. 5. Deconvolution of Spatial Gene Expression in Cancer

    Författare :Linnea Stenbeck; Stefania Giacomello; Joakim Lundeberg; Vicent Pelechano; KTH; []
    Nyckelord :Spatial transcriptomics; Gene expression; Cancer; Bioteknologi; Biotechnology;

    Sammanfattning : Cancer is the second leading cause of death in the world, claiming nearly 10 million lives in 2020 alone. One of the main issues in anti-cancer treatment is the heterogeneity of the tumor microenvironment (TME). The TME consists of different cells that are critical for cancer development. LÄS MER