Sökning: "adaptive strategies"

Visar resultat 21 - 25 av 265 avhandlingar innehållade orden adaptive strategies.

1. 21. Engineering Competitive and Query-Optimal Minimal-Adaptive Randomized Group Testing Strategies

   Författare :Muhammad Azam Sheikh; Chalmers tekniska högskola; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; NATURVETENSKAP; NATURAL SCIENCES; learning by queries; combinatorial search; competitive ratio; randomization; pooling design; group testing; linear program;

   Sammanfattning : Suppose that given is a collection of $n$ elements where $d$ of them are \emph{defective}. We can query an arbitrarily chosen subset of elements which returns Yes if the subset contains at least one defective and No if the subset is free of defectives. The problem of group testing is to identify the defectives with a minimum number of such queries. LÄS MER

3. 22. On MIMO Systems and Adaptive Arrays for Wireless Communication : Analysis and Practical Aspects

   Författare :Mattias Wennström; Michael A. Jensen; Uppsala universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Systemteknik; antenna array; calibration; MIMO system; flat fading; non-linear amplifier; switched parasitic antenna; analog beamformer; adaptive antenna testbed; Systemteknik; Systems engineering; Systemteknik; Signal Processing; signalbehandling;

   Sammanfattning : This thesis is concerned with the use of multiple antenna elements in wireless communication over frequency non-selective radio channels. Both measurement results and theoretical analysis are presented. New transmit strategies are derived and compared to existing transmit strategies, such as beamforming and space-time block coding (STBC). LÄS MER

4. 23. Uncertain Futures : Adaptive capacities to climate variability and change in the Lake Victoria Basin

   Författare :Sara Gabrielsson; LUCSUS; []
   Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; adaptive capacities; climate vulnerability; collective action; Lake Victoria Basin; smallholder farmers; sustainable adaptation; sustainability science.;

   Sammanfattning : The Lake Victoria basin (LVB) in East Africa can be considered a climate change hotspot because of its large rural population dependent on rain-fed farming. Drawing on extensive fieldwork (2007-2011) in rural communities along the shores of Lake Victoria in Kenya and Tanzania, I explore adaptive capacities to climate variability and change and discuss how they interrelate in situ. LÄS MER

5. 24. Procedures in Adaptive Finite Element Analysis

   Författare :Peter Möller; Chalmers tekniska högskola; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY;

   Sammanfattning : The present work is concerned with topics related to some adaptive methods for the approximate solution of differential equations. Emphasis is on the finite element method for second order elliptic equations, where we use either p-refinement or remeshing with an advancing front mesh generator in order to improve approximate solutions. LÄS MER

7. 25. High Cell Density Strategies and Adaptive Evolution for Microbial Propionic Acid Production

   Författare :Victor Hugo Cavero Olguin; Bioteknik; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES;

   Sammanfattning : Propionic acid (PA) is a naturally occurring short chain fatty acid produced by microbial fermentation of the indigestible foods in the intestine, having a positive effect on the gastrointestinal health. PA inhibits the growth of pathogenic bacteria and molds; hence it is widely used as preservative for food, feed and grains. LÄS MER