Sökning: "Syntetisk"

Visar resultat 31 - 35 av 238 uppsatser innehållade ordet Syntetisk.

  1. 31. Uncertainties in the use of synthetic CT (sCT) for daily online adaptive radiotherapy for lung cancer

    Master-uppsats, Lunds universitet/Sjukhusfysikerutbildningen

    Författare :Johansson Vivika; [2023]
    Nyckelord :Medicine and Health Sciences;

    Sammanfattning : Background and purpose: Cone Beam Computed Tomography (CBCT) based online adaptive radiotherapy (oART) has been clinically implemented for several anatomical sites worldwide. However, random and abrupt anatomical changes with large density alterations can occur in lung patients, leading to uncertainties with synthetic computed tomography (sCT) and dose calculation. LÄS MER

  3. 32. PFAS-föroreningars påverkan på Gävles grund- och dricksvattentäkt : Kartläggning av potentiella riskverksamheter och bedömning av risk

    Kandidat-uppsats, Högskolan i Gävle/Miljövetenskap

    Författare :Marie Lundgren; Josefin Flink; [2023]
    Nyckelord :PFAS; PFAA; drinking water; concentration criteria; groundwater source; simplified risk assessment; PFAS; PFAA; dricksvatten; haltkriterier; vattentäkt; förenklad riskbedömning;

    Sammanfattning : The environmental toxin PFAS (per- and polyfluorinated alkyl substances) is a heterogeneous synthetic industrial chemical group that has been used since the 1950s which, due to its attractive properties, has a wide range of applications in our society. PFAS are persistent and bioaccumulative, which means that the levels increase in the environment over time; At higher levels, the substances are toxic and show a negative effect on human health. LÄS MER

  4. 33. Generating Extreme Value Distributions in Finance using Generative Adversarial Networks

    Master-uppsats, KTH/Matematik (Avd.)

    Författare :William Nord-Nilsson; [2023]
    Nyckelord :Extreme Value Theory; Generative Adversarial Networks; Stress Testing; Machine Learning; Convolutional Neural Networks; evtGAN; Extreme Events; Extremvärdesteori; Generativa nätverk; Stresstestning; Maskininlärning; Djupt neuralt nätverk; evtGAN; Extrema händelser;

    Sammanfattning : This thesis aims to develop a new model for stress-testing financial portfolios using Extreme Value Theory (EVT) and General Adversarial Networks (GANs). The current practice of risk management relies on mathematical or historical models, such as Value-at-Risk and expected shortfall. LÄS MER

  5. 34. Privacy preserving data access mechanism for health data

    M1-uppsats, KTH/Hälsoinformatik och logistik

    Författare :Najiib Abdi Dahir; Ikran Dahir Ali; [2023]
    Nyckelord :Secure data sharing; synthetic data; privacy preservation; healthcare; machine learning.; Säker datadelning; syntetiska data; integritetsbevarande; hälso- och sjukvård; maskininlärning;

    Sammanfattning : Due to the rise of digitalization and the growing amount of data, ensuring the integrity and security of patient data has become increasingly vital within the healthcare industry, which has traditionally managed substantial quantities of sensitive patient and personal information. This bachelor's thesis focused on designing and implementing a secure data sharing infrastructure to protect the integrity and confidentiality of patient data. LÄS MER

  7. 35. Spatiotemporal PET reconstruction with Learned Registration

    Kandidat-uppsats, KTH/Skolan för elektroteknik och datavetenskap (EECS)

    Författare :Pierre Meyrat; [2022]
    Nyckelord :PET; Tomographic reconstruction; Deep Learning; MLEM; PET; Tomografisk rekonstruktion; Deep Learning; MLEM;

    Sammanfattning : Because of the long acquisition time of Positron Emission Tomography scanners, the reconstructed images are blurred by motion. We hereby propose a novel motion-correction maximum-likelihood expectation-maximization algorithm integrating 3D movements between the different gates estimated by a neural network trained on synthetic data with contrast invariance. LÄS MER