Essays about: "event tree analysis"

Showing result 1 - 5 of 17 essays containing the words event tree analysis.

  1. 1. Exploring patterns in risk factors for bark beetle attack during outbreaks triggered by drought stress with harvester data on attacked trees: A case study in Southeastern Sweden

    University essay from Lunds universitet/Institutionen för naturgeografi och ekosystemvetenskap

    Author : Nikolaos Kouskoulis; [2023]
    Keywords : Geography; GIS; Geographic Information Science; Forest ecosystems; Bark beetle outbreak; Southeastern Sweden; Predisposing factors; Triggering factors; Drought stress; Earth and Environmental Sciences;

    Abstract : ABSTRACT Raising temperatures and climate variability have intensified extreme weather events worldwide. These extremes can enhance and trigger possible pest outbreaks. Bark beetle attacks have become a major concern in regions with extensive spruce forest areas. Southeastern Sweden has faced repeated outbreaks resulting in widespread tree loss. READ MORE

  3. 2. Reliability Assessment of Passive ICS in an SMR as part of the PSA Analysis

    University essay from KTH/Fysik

    Author : Graeme Trundle; [2023]
    Keywords : Passive system reliability; Probabilistic safety assessment; Reliability Methods of Passive Systems; Natural circulation; TRACE; RiskSpectrum; Passiv systemtillförlitlighet; Probabilistisk säkerhetsbedömning; Reliability Methods of Passive Systems; Naturlig cirkulation; TRACE; RiskSpectrum;

    Abstract : Passive safety systems are increasingly being utilized in prospective nuclear power plant designs. Indeed, the use of safety systems driven by natural phenomena might be seen as an unmitigated virtue. READ MORE

  4. 3. Event categorisation and Machine-learning Techniques in Searches for Higgs Boson Pairs in the ATLAS Experiment at the LHC

    University essay from Uppsala universitet/Högenergifysik

    Author : Milads Emadi; [2023]
    Keywords : Particle Physics; ATLAS; BDT; Boosted Decision Tree; Decision Tree; Optimization; Machine Learning; Analysis;

    Abstract : This thesis investigates the pair production of Higgs bosons (di-Higgs events) at the ATLAS experiment in the Large Hadron Collider (LHC), focusing on the channel where one Higgs boson decays into two bottom quarks and the other decays into two tau leptons. The main objective was to determine whether introducing a split in the invariant mass of the decay products from the two Higgs bosons (the di-Higgs mass) and using this as an analysis variable improves the sensitivity of the Boosted Decision Tree (BDT) machine learning algorithm to the di-Higgs signal. READ MORE

  5. 4. Consequences of using Quantitative Risk Assessment as a verification tool

    University essay from Lunds universitet/Avdelningen för Brandteknik

    Author : Joey Öström; [2022]
    Keywords : Quantitative Risk Assessment; QRA; performance-based design; verification tool; performance solution; performance requirements; fire risk assessment; residential building; Technology and Engineering;

    Abstract : What are the consequences of using Quantitative risk assessment (QRA) as a verification tool? Performance-based building codes differ from prescriptive-based codes in that they define specific objectives to be met, enabling the building designer to choose which solution to use so long it meets the objectives. This master’s thesis explores the consequences of using QRA as a verification tool in comparison to existing verification methods currently in use in Australia. READ MORE

  6. 5. Free-text Informed Duplicate Detection of COVID-19 Vaccine Adverse Event Reports

    University essay from Uppsala universitet/Avdelningen för systemteknik

    Author : Erik Turesson; [2022]
    Keywords : Duplicate detection; Deduplication; Record linkage; Adverse Event Reports; COVID-19 Vaccines; Uppsala Monitoring Centre; VigiBase; Machine Learning; Gradient Boosted Decision Trees; BERT; Natural Language Processing; Pharmacovigilance; Individual Case Safety Reports;

    Abstract : To increase medicine safety, researchers use adverse event reports to assess causal relationships between drugs and suspected adverse reactions. VigiBase, the world's largest database of such reports, collects data from numerous sources, introducing the risk of several records referring to the same case. READ MORE