Sökning: "entropy"

Visar resultat 1 - 5 av 318 avhandlingar innehållade ordet entropy.

1. 1. Entropy and Speech

   Författare :Mattias Nilsson; Bastian Kleijn; Sören Holdt Jensen; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; speech representation; energy concentration; entropy estimation; manifolds; Acoustics; Akustik;

   Sammanfattning : In this thesis, we study the representation of speech signals and the estimation of information-theoretical measures from observations containing features of the speech signal. The main body of the thesis consists of four research papers. Paper A presents a compact representation of the speech signal that facilitates perfect reconstruction. LÄS MER

3. 2. Nonparametric Statistical Inference for Entropy-type Functionals

   Författare :David Källberg; Oleg Seleznjev; Timo Koski; Umeå universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; entropy estimation; Rényi entropy; divergence estimation; quadratic density functional; U-statistics; consistency; asymptotic normality; Poisson convergence; stationary m-dependent sequence; inter-point distances; entropy maximizing distribution; two-sample problem; approximate matching; Mathematical Statistics; matematisk statistik;

   Sammanfattning : In this thesis, we study statistical inference for entropy, divergence, and related functionals of one or two probability distributions. Asymptotic properties of particular nonparametric estimators of such functionals are investigated. We consider estimation from both independent and dependent observations. LÄS MER

4. 3. Enthalpy and Entropy in Enzyme Catalysis : A Study of Lipase Enantioselectivity

   Författare :Jenny Ottosson; KTH; []
   Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Biocatalysis; enzyme catalysis; Candida antarctica lipase B; enantioselectivity; enthalpy; entropy; CALB; enantiomeric ratio; Bioengineering; Bioteknik;

   Sammanfattning : Biocatalysis has become a popular technique in organic synthesis due to high activity and selectivity of enzyme catalyzed reactions. Enantioselectivity is a particularly attractive enzyme property, which is utilized for the production of enantiopure substances. LÄS MER

5. 4. Guesswork and Entropy as Security Measures for Selective Encryption

   Författare :Reine Lundin; Stefan Lindskog; Svein Knapskog; Karlstads universitet; []
   Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; Computer security; security metrics; selective encryption; confidentiality; entropy; guesswork.; Computer Science; Datavetenskap;

   Sammanfattning : More and more effort is being spent on security improvements in today's computer environments, with the aim to achieve an appropriate level of security. However, for small computing devices it might be necessary to reduce the computational cost imposed by security in order to gain reasonable performance and/or energy consumption. LÄS MER

7. 5. Entropy, information theory and spatial input-output analysis

   Författare :David F. Batten; Umeå universitet; []
   Nyckelord :SAMHÄLLSVETENSKAP; SOCIAL SCIENCES; Commodity flows; dynamic analysis; entropy; information theory; input-output analysis; probability distributions; regional and interregional modelling;

   Sammanfattning : Interindustry transactions recorded at a macro level are simply summations of commodity shipment decisions taken at a micro level. The resulting statistical problem is to obtain minimally biased estimates of commodity flow distributions at the disaggregated level, given various forms of aggregated information. LÄS MER