Sökning: "LAPLACE"
Visar resultat 21 - 25 av 91 avhandlingar innehållade ordet LAPLACE.
21. Some Contributions to Filtering, Modeling and Forecasting of Heteroscedastic Time Series
Sammanfattning : Heteroscedasticity (or time-dependent volatility) in economic and financial time series has been recognized for decades. Still, heteroscedasticity is surprisingly often neglected by practitioners and researchers. This may lead to inefficient procedures. LÄS MER
22. Spectral estimates for the magnetic Schrödinger operator and the Heisenberg Laplacian
Sammanfattning : I denna avhandling, som omfattar fyra forskningsartiklar, betraktas två operatorer inom den matematiska fysiken. De båda tidigare artiklarna innehåller resultat för Schrödingeroperatorn med Aharonov-Bohm-magnetfält. LÄS MER
23. Random Models in Time and Space with Financial, Economics and Engineering Applications : Structural Covariance in Space and Stochastic Variability in Time
Sammanfattning : In this thesis, we model stochastic processes in time and space. We focus on the processes whose covariance structure is either changing over the time span, or depends on the location in space. We develop models that appropriately describe and analyze such data behaviors in various different fields including finance, economics and engineering. LÄS MER
24. Impact damping and airplane towing : two studies of the response of solid bodies to transient loads
Sammanfattning : The impact of a linearly elastic hammer on a linearly viscoelastic plate is the first problem considered in this thesis. The results, obtained by using the Laplace transformation method, can be used in the design of impact protection devices. LÄS MER
25. Asymptotic distribution theory for some test statistics in autoregressive and Galton-Watson processes
Sammanfattning : In this thesis, we study asymptotic distributions of some unit root test statistics in autoregressive processes. We then generalize, at first to the situation when the true parameter value is close to one^(thenear integrated case), and secondly to the corresponding test problems in the Galton-Watson process (i.e. LÄS MER