Sökning: "markov"

Visar resultat 1 - 5 av 320 uppsatser innehållade ordet markov.

  1. 1. Quantum Error Correction Using Graph Neural Networks

    Master-uppsats, Göteborgs universitet / Institutionen för fysik

    Författare :Valdemar Bergentall; [2021-06-17]
    Nyckelord :Quantum error correction; surface code; graph neural networks;

    Sammanfattning : A graph neural network (GNN) is constructed and trained with a purpose of usingit as a quantum error correction decoder for depolarized noise on the surface code.Since associating syndromes on the surface code with graphs instead of grid-likedata seemed promising, a previous decoder based on the Markov Chain Monte Carlomethod was used to generate data to create graphs. LÄS MER

  2. 2. Markov Chain Monte Carlo (MCMC) and Bayesian Inference for Gravitational Waves

    Kandidat-uppsats, Lunds universitet/Astronomi

    Författare :Christine Andersson; [2021]
    Nyckelord :Gravitational Waves; LISA; LISA mission; Bayesian Inference; Markov Chain Monte Carlo; MCMC; Bayes’ Theorem; stochastic sampling; Metropolis Hastings; histograms; Physics and Astronomy;

    Sammanfattning : The Laser Interferometer Space Antenna (LISA) is a space borne gravitational wave detec- tor set to launch in 2034, with the objective of detecting and studying the Gravitational Waves (GWs) of our universe. So far, ground-based detectors such as the Laser Interferometer Gravitational-Wave Observatory (LIGO) have been successful in detecting GWs, but the limitations of ground based detectors is what makes LISA so special. LÄS MER

  3. 3. Identifiability of pharmacological models from data

    Uppsats för yrkesexamina på avancerad nivå, Lunds universitet/Institutionen för reglerteknik

    Författare :Amina Gojak; [2021]
    Nyckelord :Technology and Engineering;

    Sammanfattning : In order to automate anaesthesia in patients using propofol, closed-loop control systems with models that describe the time course of the drug effects on the body are required, usually being represented by pharmacokinetics and pharmacodynamics(PKPD). This thesis focused on evaluating parameter identifiability for the PK part of the model, using a model proposed by Eleveld et al. LÄS MER

  4. 4. Prediktion av svenska riksdagsval : En kvantitativ studie med bayesianska regressionsmodeller

    Kandidat-uppsats, Uppsala universitet/Statistiska institutionen; Uppsala universitet/Statistiska institutionen

    Författare :Gustav Olsson; Manne Ölfvingsson; [2021]
    Nyckelord :Valprediktion; Bayesiansk statistik; Sveriges riksdag; Strukturella regressionsmodeller; Rstan;

    Sammanfattning : Syftet med uppsatsen är att studera olika residualfördelningar i samband med skapande av modeller föratt predicera valresultat till Sveriges riksdag. Modellerna inkluderar olika typer av t-fördelningar,gammafördelningen samt normalfördelningen som används som referensmodell från en tidigare studie. LÄS MER

  5. 5. Efficient Sampling of Gaussian Processes under Linear Inequality Constraints

    Master-uppsats, Linköpings universitet/Statistik och maskininlärning

    Författare :Bayu Beta Brahmantio; [2021]
    Nyckelord :Gaussian process; truncated multivariate Gaussian; Hamiltonian Monte Carlo; Elliptical Slice Sampling;

    Sammanfattning : In this thesis, newer Markov Chain Monte Carlo (MCMC) algorithms are implemented and compared in terms of their efficiency in the context of sampling from Gaussian processes under linear inequality constraints. Extending the framework of Gaussian process that uses Gibbs sampler, two MCMC algorithms, Exact Hamiltonian Monte Carlo (HMC) and Analytic Elliptical Slice Sampling (ESS), are used to sample values of truncated multivariate Gaussian distributions that are used for Gaussian process regression models with linear inequality constraints. LÄS MER