Results 1 - 10 of 15,712

Holography in Radiation-dominated Universe with a

by Positive Cosmological Constant, Rong-gen Cai, Yun Soo Myung , 2002
"... We discuss the holographic principle in a radiation-dominated, closed Friedmann-Robertson-Walker (FRW) universe with a positive cosmological constant. By introducing a cosmological D-bound on entropy of matter in the universe, we can write the Friedmann equation governing evolution of the universe i ..."
Abstract - Cited by 2 (0 self) - Add to MetaCart
We discuss the holographic principle in a radiation-dominated, closed Friedmann-Robertson-Walker (FRW) universe with a positive cosmological constant. By introducing a cosmological D-bound on entropy of matter in the universe, we can write the Friedmann equation governing evolution of the universe

Speaker verification using Adapted Gaussian mixture models

by Douglas A. Reynolds, Thomas F. Quatieri, Robert B. Dunn - Digital Signal Processing , 2000
"... In this paper we describe the major elements of MIT Lincoln Laboratory’s Gaussian mixture model (GMM)-based speaker verification system used successfully in several NIST Speaker Recognition Evaluations (SREs). The system is built around the likelihood ratio test for verification, using simple but ef ..."
Abstract - Cited by 1010 (42 self) - Add to MetaCart
but effective GMMs for likelihood functions, a universal background model (UBM) for alternative speaker representation, and a form of Bayesian adaptation to derive speaker models from the UBM. The development and use of a handset detector and score normalization to greatly improve verification performance

A Bayesian Framework for the Analysis of Microarray Expression Data: Regularized t-Test and Statistical Inferences of Gene Changes

by Pierre Baldi, Anthony D. Long - Bioinformatics , 2001
"... Motivation: DNA microarrays are now capable of providing genome-wide patterns of gene expression across many different conditions. The first level of analysis of these patterns requires determining whether observed differences in expression are significant or not. Current methods are unsatisfactory ..."
Abstract - Cited by 491 (6 self) - Add to MetaCart
distributions, parameterized by corresponding means and variances with hierarchical prior distributions. We derive point estimates for both parameters and hyperparameters, and regularized expressions for the variance of each gene by combining the empirical variance with a local background variance associated

Matching Radiation-Dominated and Matter-Dominated Einstein-de Sitter Universes and an Application for Primordial Black Holes in Evolving Cosmological Backgrounds

by unknown authors , 2006
"... Abstract By matching across a surface of constant time, it is demon-strated that the spacetime for a radiation-dominated Einstein-de Sitter universe can be directly matched to the spacetime for a matter-dominated Einstein-de Sitter universe. Thus, this can serve as a model of a universe filled with ..."
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Abstract By matching across a surface of constant time, it is demon-strated that the spacetime for a radiation-dominated Einstein-de Sitter universe can be directly matched to the spacetime for a matter-dominated Einstein-de Sitter universe. Thus, this can serve as a model of a universe filled

Radiation-Dominated Quantum Friedmann Models

by Nivaldo A. Lemos - Journal of Mathematical Physics , 1996
"... Radiation-filled Friedmann-Robertson-Walker universes are quantized according to the Arnowitt-Deser-Misner formalism in the conformal-time gauge. Unlike previous treatments of this problem, here both closed and open models are studied, only square-integrable wave functions are allowed, and the bound ..."
Abstract - Cited by 1 (0 self) - Add to MetaCart
Radiation-filled Friedmann-Robertson-Walker universes are quantized according to the Arnowitt-Deser-Misner formalism in the conformal-time gauge. Unlike previous treatments of this problem, here both closed and open models are studied, only square-integrable wave functions are allowed

Force Behaviour in Radiation-Dominated Friedmann Universe

by M. Sharif , 2004
"... We consider radiation-dominated Friedmann universe and evaluate its force four-vector and momentum. We analyse and compare the results with the already evaluated for the matter-dominated Friedmann model. It turns out that the results are physically acceptable. 1 ..."
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We consider radiation-dominated Friedmann universe and evaluate its force four-vector and momentum. We analyse and compare the results with the already evaluated for the matter-dominated Friedmann model. It turns out that the results are physically acceptable. 1

Abstract Cosmological Black Holes as Models of Cosmological Inhomogeneities

by Megan L. Mcclure, Megan L. Mcclure , 2006
"... Since cosmological black holes modify the density and pressure of the surrounding universe, and introduce heat conduction, they produce simple models of cosmologi-cal inhomogeneities that can be used to study the eect of inhomogeneities on the universe's expansion. In this thesis, new cosmologi ..."
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, and this is used to generate the rst solutions for primordial black holes that evolve from being in radiation-dominated background universes to matter-dominated background universes. Finally, the Weyl curvature, volume expansion, velocity eld, shear, and acceleration are calculated for the cos-ii mological black

Clustering by compression

by Rudi Cilibrasi, Paul M. B. Vitányi - IEEE Transactions on Information Theory , 2005
"... Abstract—We present a new method for clustering based on compression. The method does not use subject-specific features or background knowledge, and works as follows: First, we determine a parameter-free, universal, similarity distance, the normalized compression distance or NCD, computed from the l ..."
Abstract - Cited by 297 (25 self) - Add to MetaCart
Abstract—We present a new method for clustering based on compression. The method does not use subject-specific features or background knowledge, and works as follows: First, we determine a parameter-free, universal, similarity distance, the normalized compression distance or NCD, computed from

Status of land cover classification accuracy assessment

by Giles M. Foody - REMOTE SENSING OF ENVIRONMENT , 2002
"... The production of thematic maps, such as those depicting land cover, using an image classification is one of the most common applications of remote sensing. Considerable research has been directed at the various components of the mapping process, including the assessment of accuracy. This paper brie ..."
Abstract - Cited by 266 (3 self) - Add to MetaCart
briefly reviews the background and methods of classification accuracy assessment that are commonly used and recommended in the research literature. It is, however, evident that the research community does not universally adopt the approaches that are often recommended to it, perhaps a reflection

World-wide web: The information universe

by Tim Berners-lee, Robert Cailliau, Jean-françois Groff, Bernd Pollermann - Electronic Netw0rkinn:Research. Applications and Policy, 8(2), Westport k ~ spring , 1992
"... The World-Wide Web (W 3) initiative is a practical project to bring a global information universe into existence using available technology. This article describes the aims, data model, and protocols needed to implement the “web”, and compares them with various contemporary systems. The Dream Pick u ..."
Abstract - Cited by 226 (1 self) - Add to MetaCart
The World-Wide Web (W 3) initiative is a practical project to bring a global information universe into existence using available technology. This article describes the aims, data model, and protocols needed to implement the “web”, and compares them with various contemporary systems. The Dream Pick
Results 1 - 10 of 15,712