Essays about: "maximum likelihood"

Showing result 21 - 25 of 244 essays containing the words maximum likelihood.

  1. 21. Identification and expression of genes involved in the arabinoxylan biosynthetic pathway in oat

    University essay from SLU/Dept. of Plant Protection Biology

    Author : Johan Valeur; [2022]
    Keywords : Arabinoxylan; Oat; Gene expression analysis;

    Abstract : Oat is one of the most cultivated cereal crops in the world, and Arabinoxylan (AX) is a dietary fiber in oats with positive health effects. The biosynthetic pathway AX in Oat is still unknown, and which genes are active in its production. Ortholog genes have been identified in oat from other species like rice, wheat, barley, and Arabidopsis. READ MORE

  3. 22. Investigating Relations between Regularization and Weight Initialization in Artificial Neural Networks

    University essay from Lunds universitet/Beräkningsbiologi och biologisk fysik - Genomgår omorganisation

    Author : Rasmus Sjöö; [2022]
    Keywords : Artificial Neural Networks; L1 Regularization; L2 Regularization; Loss Function; Maximum Likelihood; Regularization Strength Synthetic Data Generation; Weight Initialization; Physics and Astronomy;

    Abstract : L2 regularization is a common method used to prevent overtraining in artificial neural networks. However, an issue with this method is that the regularization strength has to be properly adjusted for it to work as intended. This value is usually found by trial and error which can take some time, especially for larger networks. READ MORE

  4. 23. A Study Of Using Communication Signals As Sonar Pulses In Underwater Sensor Systems

    University essay from Uppsala universitet/Signaler och system

    Author : Erica Svensson; [2022]
    Keywords : Sonar; Communication signal; Beamforming; Underwater sensor system; WLS estimator; Detection algorithm; Position estimation;

    Abstract : Underwater communication within underwater sensor network is crucial for surveillance of coast and ocean areas. The aim of this report was to examine whether it is realistic to use the communication signal which is sent from one node to another as a sonar pulse, and in such case at what distances. READ MORE

  5. 24. Financial Modelling Using Fractional Processes And The Wiener Chaos Expansion

    University essay from KTH/Matematik (Avd.)

    Author : Olof Hummelgren; [2022]
    Keywords : fractional Brownian motion; fBM; applied mathematics; Wiener chaos expansion; Wick product; Hurst parameter; fraktionell Brownsk rörelse; tillämpad matematik; Wiener kaosexpansion; Wickprodukt; Hurstparameter;

    Abstract : The aim of this thesis is to simulate stochastic models that are driven by a fractional Brownian motion process and to apply these methods to financial applications related to yield rate and asset price modelling. Several rough volatility processes are used to model the asset price and yield dynamics. READ MORE

  6. 25. Spatiotemporal PET reconstruction with Learned Registration

    University essay from KTH/Skolan för elektroteknik och datavetenskap (EECS)

    Author : Pierre Meyrat; [2022]
    Keywords : PET; Tomographic reconstruction; Deep Learning; MLEM; PET; Tomografisk rekonstruktion; Deep Learning; MLEM;

    Abstract : 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. READ MORE