Sökning: "inverse method"

Visar resultat 21 - 25 av 204 uppsatser innehållade orden inverse method.

  1. 21. Deep Neural Networks for dictionary-based 5G channel estimation with no ground truth in mixed SNR scenarios

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

    Författare :Matteo Ferrini; [2022]
    Nyckelord :5G; Channel Estimation; Sparse Linear Inverse Problem; Approximate Message Passing; Neural Networks; 5G; kanaluppskattning; sparsamt linjärt inversproblem; approximativ meddelandeöverföring; neurala nätverk;

    Sammanfattning : Channel estimation is a fundamental task for exploiting the advantages of massive Multiple-Input Multiple-Output (MIMO) systems in fifth generation (5G) wireless technology. Channel estimates require solving sparse linear inverse problems that is usually performed with the Least Squares method, which brings low complexity but high mean squared error values. LÄS MER

  3. 22. Development and evaluation of an inter-subject image registration method for body composition analysis for three slice CT images

    Uppsats för yrkesexamina på avancerad nivå, Uppsala universitet/Institutionen för informationsteknologi

    Författare :Hugo Dahlberg; [2022]
    Nyckelord :Medical imaging; Image registration; SCAPIS;

    Sammanfattning : Over 30 000 liver, abdomen, and thigh slices have been acquired by computed tomography for the SCAPIS and IGT study. To utilise the full potential of the large cohort and enable statistical pixel-wise body composition analysis and visualisation of associations with other biomarkers, a point-to-point correspondence between the scans is needed. LÄS MER

  4. 23. Kriging radio environment map construction

    Master-uppsats, Luleå tekniska universitet/Rymdteknik

    Författare :Erik Lundqvist; [2022]
    Nyckelord :Kriging; Radio environment; Statistics; Inverse distance weighting;

    Sammanfattning : With the massive increase in usage of some parts of the electromagnetic spectrum during the last decades, the ability to create real time maps of signal coverage is now more important than ever before. This Masters project is designed to test two different methods of generating such maps with a one second limit to processing time. LÄS MER

  5. 24. Root Cause Analysis and Classification for Firewall Log Events Using NLP Methods

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

    Författare :Tongxin Wang; [2022]
    Nyckelord :Log Analysis; BERT; Natural Language Processing; Log Classification; Transformers; Log Analysis; BERT; Naturligt språk-behandling; Log-Klassificering; Transformers;

    Sammanfattning : Network log records are robust evidence for enterprises to make error diagnoses. The current method of Ericsson’s Networks team for troubleshooting is mainly by manual observation. However, as the system is getting vast and complex, the log messages show a growth trend. LÄS MER

  7. 25. Geometry Dependent Optimal Bounds of Absorption and Scattering Cross-section for Small Nanoparticles

    Master-uppsats, Linnéuniversitetet/Institutionen för fysik och elektroteknik (IFE)

    Författare :Md Shabbir Hossain Khan; [2022]
    Nyckelord :Scattering; Absorption; Nanoparticle; Cross-section; Mie; Electromagnetic; FDTD; dipole; Wavenumber.;

    Sammanfattning : Light-matter interaction in particles of subwavelength size mostly depends on the size, shape, composition of the particles and relies on the properties of incident light. Henceforth, resonant behavior of light can be effectively controlled by changing the aforesaid geometrical parameters. LÄS MER