Search for dissertations about: "self-similarity"

Showing result 1 - 5 of 16 swedish dissertations containing the word self-similarity.

2. 1. Reinforcement learning for admission control and routing

   Author : Jakob Carlström; Uppsala universitet; []
   Keywords : NATURAL SCIENCES; NATURVETENSKAP; routing; admission control; reinforcement learning; Markov decision processes; temporal-difference learning; policy iteration; gain scheduling; neural networks; self-similarity; asynchronous transfer mode; max-min fairness; Information technology; Informationsteknik; Computer Systems; Datorteknik;

   Abstract : When a user requests. a connection to another user or a computer in a communications network, a routing algorithm selects a path for transferring the resulting data stream. If all suitable paths are busy, the user request cannot beserved, and is blocked. READ MORE

4. 2. A Non-Gaussian Limit Process with Long-Range Dependence

   Author : Raimundas Gaigalas; Ingemar Kaj; Esko Valkeila; Uppsala universitet; []
   Keywords : NATURAL SCIENCES; NATURVETENSKAP; NATURVETENSKAP; NATURAL SCIENCES; Mathematical statistics; long-range dependence; traffic modelling; arrival process; self-similarity; heavy tails; fractional Brownian motion; stable processes; renewal processes; independently scattered random measure; weak convergence; 60F17; 60G18; 90B18; 60K05 ; Matematisk statistik; Mathematical statistics; Matematisk statistik;

   Abstract : This thesis, consisting of three papers and a summary, studies topics in the theory of stochastic processes related to long-range dependence. Much recent interest in such probabilistic models has its origin in measurements of Internet traffic data, where typical characteristics of long memory have been observed. READ MORE

5. 3. On vortex breakdown in swirling annular jets

   Author : Carl Fredrik Stein; Göteborgs universitet; Göteborgs universitet; Gothenburg University; []
   Keywords : NATURVETENSKAP; NATURAL SCIENCES; swirling jets; vortex breakdown; conical self-similarity; swirl numbers; CFD; CFD;

   Abstract : .... READ MORE

6. 4. Some Mathematical Aspects of Thermo and Fluid Dynamics

   Author : Carl Fredrik Stein; Göteborgs universitet; Göteborgs universitet; Gothenburg University; []
   Keywords : swirling jets; vortex breakdown; conical self-similarity; Long s jet; Taylor s hypothesis; frozen turbulence hypothesis; advection velocity; conjugate heat transfer; asymptotic analysis; swirling jets;

   Abstract : This thesis contains mathematical treatments of three issues in thermo and fluid dynamics: swirling jets and vortex breakdown, Taylor's hypothesis and conjugate heat transfer. The work on swirling jets is focused on the study of the well-posedness of the conically self-similar free-vortex solutions to the Navier--Stokes equations. READ MORE

7. 5. Injection and Combustion of Alternative Fuels in Spark Ignited Direct Injection Engines

   Author : Lars Christian Riis Johansen; Chalmers University of Technology; []
   Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; gas fuel; direct injection; E85; stratified combustion; spark ignition; alternative fuels; optical measurements;

   Abstract : Increasingly stringent vehicle emission legislation necessitates increasingly efficient combustion engines. The use of direct injection in spark ignited engines improves engine efficiency and reduces CO2 emissions. READ MORE