Sökning: "approximate decomposition"

Visar resultat 1 - 5 av 12 uppsatser innehållade orden approximate decomposition.

  1. 1. Nonlinear Methods of Aerodynamic Data-driven Reduced Order Modeling

    Uppsats för yrkesexamina på avancerad nivå, Uppsala universitet/Avdelningen för beräkningsvetenskap

    Författare :Arvid Forsberg; [2022]
    Nyckelord :machine learning; aerodynamics; autoencoder; kernel transformation; principal component analysis; nonlinear; regression; modeling; surrogate model; reduced order modeling; neural network;

    Sammanfattning : Being able to accurately approximate outputs of computationally expensive simulations for arbitrary input parameters, also called missing points estimation, is central in many different areas of research and development with applications ranging from uncertainty propagation to control system design to name a few. This project investigates the potential of kernel transformations and nonlinear autoencoders as methods of improving the accuracy of the proper orthogonal decomposition method combined with regression. LÄS MER

  3. 2. Sparse Approximation of Spatial Channel Model with Dictionary Learning

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

    Författare :Matilda Zhou; [2022]
    Nyckelord :Spatial channel model SCM ; dictionary learning; compressive sensing CS ; discrete Fourier transform DFT ; overcomplete discrete Fourier transform ODFT ; Rumslig kanalmodell; ordbokslärning; kompressionsavkänning; diskret Fourier-transform; överkomplett diskret Fourier-transform;

    Sammanfattning : In large antenna systems, traditional channel estimation is costly and infeasible in some situations. Compressive sensing was proposed to estimate the channel with fewer measurements. Most of the previous work uses a predefined discrete Fourier transform matrix or overcomplete Fourier transform matrix to approximate the channel. LÄS MER

  4. 3. Sheet Metal Forming Simulations with Elastic Dies: Emphasis on Computational Cost

    Uppsats för yrkesexamina på avancerad nivå, Blekinge Tekniska Högskola/Institutionen för maskinteknik

    Författare :Sara Allesson; [2019]
    Nyckelord :Elastic Sheet Metal Forming Simulation; Computational Cost; Decomposition; LS-DYNA; Elastisk plåtformningssimulering; beräkningskostnad; dekomposition; LS-DYNA;

    Sammanfattning : The car industry produces many of their car parts by using sheet metal forming, where one of the most time-consuming phases is the development and manufacturing of new forming tools. As of today, when a new tool is to be evaluated in terms of usability, a forming simulation is conducted to predict possible failures before manufacturing. LÄS MER

  5. 4. Evaluation of analytical approximations of two-asset basket option price

    Magister-uppsats, Lunds universitet/Nationalekonomiska institutionen

    Författare :Teo Nilsson; [2015]
    Nyckelord :Teo; Nilsson; Basket-option; Option-pricing; Analytical-approximation; Business and Economics;

    Sammanfattning : This thesis applies the decomposition suggested by Alexander and Venkatramanan (2012) to the pay-off of a basket option of two assets with a non-zero strike to derive an approximate price of corresponding basket option. The decomposition yields two sub-baskets and a situation where sub-strikes must be chosen. LÄS MER

  7. 5. Atmospheric decomposition of cyclic ethers

    Kandidat-uppsats, Lunds universitet/Fysiska institutionen

    Författare :Ida Mexnell; [2013]
    Nyckelord :Atmospheric chemistry; environmental issues; bio fuels; furans; Physics and Astronomy;

    Sammanfattning : Renewable alternatives to fossil fuels are of importance nowadays since the use of fossil fuels is considered to stand for the largest contribution to global warming. In recent years, a group of cyclic ethers called furans have been proposed as potential renewable fuels. LÄS MER