Sökning: "Bayesian inversion"

Visar resultat 1 - 5 av 6 avhandlingar innehållade orden Bayesian inversion.

  1. 1. Location and Relocation of Seismic Sources

    Författare :Ka Lok Li; Ólafur Gudmundsson; Roland Roberts; Ari Tryggvason; Lars Ottemöller; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Earthquake location; Earthquake relocation; Tremor location; Bayesian inversion; Correlation; Earthquake catalog; Iceland; Seismicity; Interferometry; Inverse theory; Volcanic tremor; Geofysik med inriktning mot seismologi; Geophysics with specialization in Seismology;

    Sammanfattning : This dissertation is a comprehensive summary of four papers on the development and application of new strategies for locating tremor and relocating events in earthquake catalogs.In the first paper, two new strategies for relocating events in a catalog are introduced. LÄS MER

  3. 2. Retrieval of Ocean Surface Currents and Winds Using Satellite SAR backscatter and Doppler frequency shift

    Författare :Anis Elyouncha; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; Doppler centroid analysis; Bayesian inversion; ocean surface winds; Ocean surface currents; synthetic aperture radar; along-track InSAR;

    Sammanfattning : Ocean surface winds and currents play an important role for weather, climate, marine life, ship navigation, oil spill drift and search and rescue. In-situ observations of the ocean are sparse and costly. Satellites provide a useful complement to these observations. LÄS MER

  4. 3. 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

  5. 4. Satellite microwave measurements of ice cloud properties

    Författare :Bengt Rydberg; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Cirrus; radiative transfer; CIWSIR; microphysical properties; inversions; Odin;

    Sammanfattning : Ice clouds play an important role in Earth's radiation balance and climate because they reflect incoming sunlight and trap outgoing infrared radiation. There is still an uncertainty about how ice clouds will respond to the effects of global warming. Many climate models use prognostic cloud mass schemes to represent cloud feedbacks. LÄS MER

  7. 5. Spatial inference for non-lattice data using Markov Random fields

    Författare :Linda Werner Hartman; Matematisk statistik; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES;

    Sammanfattning : This thesis deals with how computationally effective lattice models could be used for inference of data with a continuous spatial index. The fundamental idea is to approximate a Gaussian field with a Gaussian Markov random field (GMRF) on a lattice. LÄS MER