Essays about: "Simon Persson"

Showing result 1 - 5 of 19 essays containing the words Simon Persson.

  1. 1. Vibroacoustic Analysis of an OLTC Diverter Switch for Condition Monitoring : Time frequency analysis with Fourier and wavelet transform in combination with multivariate logistic regression for condition monitoring of OLTC diverter switch

    University essay from Uppsala universitet/Avdelningen för systemteknik

    Author : Simon Persson; [2023]
    Keywords : Wavelet transform; CWT; logistic regression; machine learning; ML; vibroacoustic analysis; time frequency analysis; tap changer; diverter switch; power transformer; classification; prediction; condition; vibrations; state prediction; Hitachi Energy;

    Abstract : Vibrations are everywhere around us all the time and we often recognise them as sounds that we can hear and analyse with our brain. In this thesis, data that has been gathered from a diverter switch (DS) in a controlled environment, is analysed. READ MORE

  3. 2. IPO underpricing in Sweden : Is there underpricing in Swedish IPOs? If so, what could possibly explain it?

    University essay from Linnéuniversitetet/Institutionen för management (MAN)

    Author : Oskar Persson; Simon Lindblom; [2023]
    Keywords : IPO; underpricing; swedish stock market; financial economics;

    Abstract : When a company decides to sell their shares to the public for the first time it is called an initial public offering. For quite some time, the literature on the subject has come to the conclusion that the companies going public often undervalue their share price prior to the initial public offering resulting in an abnormal positive return on the first trading day, also known as initial public offering underpricing. READ MORE

  4. 3. Market Performance in the Nordic Electricity Market: An Analysis of Market Power during Energy Market Turbulence

    University essay from Lunds universitet/Ekonomisk-historiska institutionen

    Author : Simon Persson; [2023]
    Keywords : Business and Economics;

    Abstract : This paper analyzes the existence of market power on the Nordic electricity market between 2018-2022, and if the energy market turbulence caused by covid-19, and later deepened following the war in Ukraine affected producers' bidding behavior. Market power was tested using Cournot assumptions to see if producers withheld output strategically when demand was more inelastic. READ MORE

  5. 4. Beam selection using Machine Learning in Massive MIMO systems

    University essay from Lunds universitet/Institutionen för elektro- och informationsteknik

    Author : Simon Persson; [2023]
    Keywords : Massive MIMO; Beamforming; Machine Learning; 5G; NR; Antenna selection; Technology and Engineering;

    Abstract : In mobile communications the demand for increased capacity and speeds is a constant. 5G NR is the latest generation which is now seeing widespread adoption. Crucial technologies like Massive MIMO and beamforming are enabled by the use of large antenna arrays. READ MORE

  6. 5. Studies of the PMWE : Polar Mesosphere Winter Echoes

    University essay from Luleå tekniska universitet/Institutionen för system- och rymdteknik

    Author : Simon Persson; [2022]
    Keywords : Polar; Mesosphere; Winter; Echoes; ESRAD; Infrasound; PMWE; PMSE; Summer; Radar; VHF; MST; MLT; SPE; HSS; Solar; Wind; evanescent; viscosity; FCA; 42;

    Abstract : This Master thesis examines a phenomenon that occurs in the upper polar atmosphere, namely, Polar Mesospheric Winter Echoes, or PMWEs. PMWEs are radar echoes observed by Very High Frequency Mesosphere Stratosphere Troposphere (VHF MST) radar, from altitudes of 60 to 76 km at 7 to 15 UT, in the winter months from the middle of September to the beginning of May. READ MORE