Sökning: "sampling methods"

Visar resultat 21 - 25 av 772 avhandlingar innehållade orden sampling methods.

  1. 21. On large deviations and design of efficient importance sampling algorithms

    Författare :Pierre Nyquist; Henrik Hult; Sandeep Juneja; KTH; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Large deviations; Monte Carlo methods; importance sampling;

    Sammanfattning : This thesis consists of four papers, presented in Chapters 2-5, on the topics large deviations and stochastic simulation, particularly importance sampling. The four papers make theoretical contributions to the development of a new approach for analyzing efficiency of importance sampling algorithms by means of large deviation theory, and to the design of efficient algorithms using the subsolution approach developed by Dupuis and Wang (2007). LÄS MER

  3. 22. Moment Estimation Using Extreme Value Methods

    Författare :Joachim Johansson; Göteborgs universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Pareto distribution; mean estimation; heavy tailed distributions; telecommunication; m -dependence; superpopulation sampling; peaks over threshold; telecommunication;

    Sammanfattning : The thesis is composed of three papers, all dealing with the application of extreme value methods to the problem of moment estimation for heavy-tailed distributions. In Paper A, an asymptotically normally distributed estimate for the expected value of a positive random variable with infinite variance is introduced. LÄS MER

  4. 23. Development and Validation of Bioanalytical Methods : Application to Melatonin and Selected Anti-Infective Drugs

    Författare :Susanne Römsing; Yngve Bergqvist; Åsa Emmer; Uppsala universitet; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; african trypanosomiasis; melatonin; malaria; antiretroviral drugs; lumefantrine; tafenoquine; lamivudine; nevirapine; zidovudine; sampling paper; dried blood spots; capillary blood; antimalarial drugs; solid-phase extraction; liquid chromatography; Chemistry; Kemi; Analytical Chemistry; Analytisk kemi;

    Sammanfattning : This thesis describes bioanalytical methods for measuring melatonin and some anti-infective drugs in biological fluids. Solid-phase extraction (SPE) or protein precipitation was used for enrichment and purification of the analytes and Liquid Chromatography (LC) was used to analyze the samples. LÄS MER

  5. 24. Event Based Sampling with Application to Spectral Estimation

    Författare :Niclas Persson; Fredrik Gustafsson; Linköpings universitet; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Event based sampling; Time based sampling; Tire pressure monitoring system;

    Sammanfattning : In this thesis event based sampling, estimation of a single resonance frequency and the application indirect tire pressure monitoring system are studied.Event based sampling is an alternative to traditional uniform or equidistant sampling. In event based sampled systems, signals are sampled only when certain pre-defined events take place. LÄS MER

  7. 25. Passive sampling of PAHs and some trace organic compounds in occupational and residential air: needs, evaluation and limits

    Författare :Pernilla Bohlin; Göteborgs universitet; []
    Nyckelord :passive air sampling; PAH; POP; occupational environment; residential environment; exposure; stationary air sampling; personal air sampling; PUF; evaluation;

    Sammanfattning : Human exposure to elevated levels of polycyclic aromatic hydrocarbons (PAHs) and trace organic compounds (e.g. PCB, OCP, PBDE) can be related to negative health effects. This raises demands of exposure measurements to be performed. LÄS MER