Sökning: "Fundamental models"

Visar resultat 16 - 20 av 699 avhandlingar innehållade orden Fundamental models.

1. 16. Essays on International Macroeconomic Models

   Författare :Guilherme Garcia Teijeiro; Handelshögskolan i Stockholm; []
   Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES;

   Sammanfattning : Comovement in Old and New Trade: This paper explores the effect of trade on the comovement of aggregate output between countries, using tractable expressions from International Trade frameworks. The author finds that trade’s impact is ambiguous, influenced by opposing forces of cost and clearing channels. LÄS MER

3. 17. Statistical Learning, Dynamics and Control : Fast Rates and Fundamental Limits for Square Loss

   Författare :Ingvar Ziemann; Henrik Sandberg; Raginsky Maxim; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Machine Learning; Control Theory; Statistical Learning; Fundamental Limits; Electrical Engineering; Elektro- och systemteknik;

   Sammanfattning : Learning algorithms play an ever increasing role in modern engineering solutions. However, despite many recent successes, their performance in the context of dynamical and control systems is not exactly well-understood. LÄS MER

4. 18. Mathematical Models of Molecular Evolution

   Författare :Martin Nilsson; Chalmers tekniska högskola; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; dynamic fitness landscapes; quasispecies; error thresholds; evolved mutation rates; evolution in dynamic environments;

   Sammanfattning : This thesis deals with mathematical models of Darwinian evolution in populations of simple living organisms. We study models which describe how the representation of different gene sequences in the population is affected by the fundamental forces of evolutionary processes, such as selection pressure, the mutation rate and the time dynamics of the underlying fitness landscape. LÄS MER

5. 19. Supersonic flow separation with application to rocket engine nozzles

   Författare :Jan Östlund; KTH; []
   Nyckelord :turbulent; boundary layer; shock wave; interaction; overexpanded; rocket nozzle; flow separation; control; side-load; experiments; models; review;

   Sammanfattning : The increasing demand for higher performance in rocketlaunchers promotes the development of nozzles with higherperformance, which basically is achieved by increasing theexpansion ratio. However, this may lead to flow separation andensuing instationary, asymmetric forces, so-called side-loads,which may present life-limiting constraints on both the nozzleitself and other engine components. LÄS MER

7. 20. Sparse Modeling Heuristics for Parameter Estimation - Applications in Statistical Signal Processing

   Författare :Stefan Ingi Adalbjörnsson; Matematisk statistik; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; parameter estimation; sparse models; convex optimization; fundamental frequency; inharmonicity; audio localization; symbolic periodicity; alternating directions method of multipliers; N-dimensional decaying sinusoids.;

   Sammanfattning : This thesis examines sparse statistical modeling on a range of applications in audio modeling, audio localizations, DNA sequencing, and spectroscopy. In the examined cases, the resulting estimation problems are computationally cumbersome, both as one often suffers from a lack of model order knowledge for this form of problems, but also due to the high dimensionality of the parameter spaces, which typically also yield optimization problems with numerous local minima. LÄS MER