Sökning: "introductions"

Visar resultat 36 - 40 av 64 avhandlingar innehållade ordet introductions.

1. 36. Large deviations for weighted empirical measures and processes arising in importance sampling

   Författare :Pierre Nyquist; Henrik Hult; Ingemar Kaj; KTH; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES;

   Sammanfattning : This thesis consists of two papers related to large deviation results associated with importance sampling algorithms. As the need for efficient computational methods increases, so does the need for theoretical analysis of simulation algorithms. This thesis is mainly concerned with algorithms using importance sampling. LÄS MER

3. 37. 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

4. 38. Expansion rate & dispersal pattern of the non-native Roesel’s bush-cricket in Sweden

   Författare :Sonja Preuss; Sveriges lantbruksuniversitet; Sveriges lantbruksuniversitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES;

   Sammanfattning : Environmental change and anthropogenic activities influence species distributions. Species introductions have become increasingly common in an era of globalization and increased international trade and travel. The establishment of introduced species outside their native range and subsequent spread are of great conservation concern. LÄS MER

5. 39. Ecological and evolutionary effects of predation in environmental gradients

   Författare :Gunnar Öhlund; Göran Englund; Skuli Skulason; Umeå universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES;

   Sammanfattning : Understanding species interactions and how they affect densities and distributions of organisms is a central theme in ecological research. Studying such interactions in an ecosystem context is challenging as they often depend on species-specific characteristics and rates that not only change during the ontogeny of an organism, but also are affected by the surrounding environment. LÄS MER

7. 40. State and industrial actions to influence consumer behavior

   Författare :Erik Brockwell; Runar Brännlund; Robert Lundmark; Umeå universitet; []
   Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; Taxation; legislation; regulation; health; environment; tobacco; alcohol; petroleum; electricity; gas; sugar; consumption; prices; signaling effect; almost ideal demand system; public policy; panel data; media expenditure; lobbying; vector error correction model; Economics; nationalekonomi;

   Sammanfattning : This thesis consists of an introductory part and three papers.Paper [I] examines how taxes affect consumption of commodities that are detrimental to health and the environment. LÄS MER