Results 1 - 10 of 1,997

Analysis, Modeling and Generation of Self-Similar VBR Video Traffic

by Mark Garrett, Walter Willinger , 1994
"... We present a detailed statistical analysis of a 2-hour long empirical sample of VBR video. The sample was obtained by applying a simple intraframe video compression code to an action movie. The main findings of our analysis are (1) the tail behavior of the marginal bandwidth distribution can be accu ..."
Abstract - Cited by 548 (6 self) - Add to MetaCart
We present a detailed statistical analysis of a 2-hour long empirical sample of VBR video. The sample was obtained by applying a simple intraframe video compression code to an action movie. The main findings of our analysis are (1) the tail behavior of the marginal bandwidth distribution can

Loopy belief propagation for approximate inference: An empirical study. In:

by Kevin P Murphy , Yair Weiss , Michael I Jordan - Proceedings of Uncertainty in AI, , 1999
"... Abstract Recently, researchers have demonstrated that "loopy belief propagation" -the use of Pearl's polytree algorithm in a Bayesian network with loops -can perform well in the context of error-correcting codes. The most dramatic instance of this is the near Shannon-limit performanc ..."
Abstract - Cited by 676 (15 self) - Add to MetaCart
-limit performance of "Turbo Codes" -codes whose decoding algorithm is equivalent to loopy belief propagation in a chain-structured Bayesian network. In this paper we ask: is there something spe cial about the error-correcting code context, or does loopy propagation work as an ap proximate inference scheme

On the equivalence of nonnegative matrix factorization and spectral clustering

by Chris Ding, Xiaofeng He, Horst D. Simon - in SIAM International Conference on Data Mining , 2005
"... Current nonnegative matrix factorization (NMF) deals with X = FG T type. We provide a systematic analysis and extensions of NMF to the symmetric W = HH T, and the weighted W = HSHT. We show that (1) W = HHT is equivalent to Kernel K-means clustering and the Laplacian-based spectral clustering. (2) X ..."
Abstract - Cited by 159 (20 self) - Add to MetaCart
Current nonnegative matrix factorization (NMF) deals with X = FG T type. We provide a systematic analysis and extensions of NMF to the symmetric W = HH T, and the weighted W = HSHT. We show that (1) W = HHT is equivalent to Kernel K-means clustering and the Laplacian-based spectral clustering. (2

Complex Valued Equivalent-Current Dipoles Fitting for

by Yadong Wang, Nayef E. Ahmar, Juanjuan Xiang, Ling Ma, Jonathan Z. Simon - MEG Responses , International IEEE EMBS Conference on Neural Engineering , 2005
"... Abstract- Complex numbers appear naturally in biological systems in the context of the Fourier transform. In particular, physiological magnetic field data from whole head magnetoencephalography (MEG) is complex after a Fourier transform. The whole-head MEG Steady State Response (SSR) to a stationary ..."
Abstract - Cited by 2 (0 self) - Add to MetaCart
show that standard inverse methods of estimating the current sources, such as the single equivalent-current dipole, generalize to complex sources in a useful and straightforward manner. The usage and utility of the complex magnetic field and the complex neural current source are demonstrated using

Estimating equivalent dipole polarizabilities for the inductive response of isolated conductive bodies,”

by J Torquil Smith , Frank Morrison - IEEE Transactions on Geoscience and Remote Sensing, , 2004
"... ABSTRACT Away from a conductive body, secondary magnetic fields due to currents induced in the body by a time varying external magnetic field are approximated by (equivalent) magnetic dipole fields. Approximating the external magnetic field by its value at the location of the equivalent magnetic di ..."
Abstract - Cited by 9 (0 self) - Add to MetaCart
ABSTRACT Away from a conductive body, secondary magnetic fields due to currents induced in the body by a time varying external magnetic field are approximated by (equivalent) magnetic dipole fields. Approximating the external magnetic field by its value at the location of the equivalent magnetic

EQUIVALENT SCHEME AND PARAMETERS OF DISC LOADED WAVEGUIDE AT DIPOLE MODE*

by unknown authors
"... Work supported by DESY / Hamburg. An equivalent scheme of disc loaded waveguide (DLW) with constant gradient in dipole mode consisting of series and parallel branches are used for obtaining of dispersion equation and for field calculation. Contrary of other works the scheme under consideration inclu ..."
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Work supported by DESY / Hamburg. An equivalent scheme of disc loaded waveguide (DLW) with constant gradient in dipole mode consisting of series and parallel branches are used for obtaining of dispersion equation and for field calculation. Contrary of other works the scheme under consideration

Realistic Source Models of ERP Data

by John E. Richards , 2005
"... author claims copyright privileges on all parts of this paper. Some material is quoted verbatim from other sources and that material is indicated with quotes and references). The purpose of this document is to detail the development of realistic ECD source models of ERP data. The electroencephalogra ..."
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, equivalent current dipole analysis; Huizenga & Molenaar, 1994; Scherg, 1990, 1992; Scherg & Picton, 1991). “Equivalent Current Dipole” (ECD) analysis hypotheses a cortical dipole or set of dipoles, calculates the forward solution, compares the forward solution with the empirical data, and adjusts

Coil sensitivity encoding for fast MRI. In:

by Klaas P Pruessmann , Markus Weiger , Markus B Scheidegger , Peter Boesiger - Proceedings of the ISMRM 6th Annual Meeting, , 1998
"... New theoretical and practical concepts are presented for considerably enhancing the performance of magnetic resonance imaging (MRI) by means of arrays of multiple receiver coils. Sensitivity encoding (SENSE) is based on the fact that receiver sensitivity generally has an encoding effect complementa ..."
Abstract - Cited by 193 (3 self) - Add to MetaCart
configurations and k-space sampling patterns. Special attention is given to the currently most practical case, namely, sampling a common Cartesian grid with reduced density. For this case the feasibility of the proposed methods was verified both in vitro and in vivo. Scan time was reduced to one-half using a two

Familiarization, attention, and recognition memory in infancy: An ERP and cortical source localization study

by Greg D. Reynolds, John E. Richards - Developmental Psychology , 2005
"... This study investigated the effects of familiarization and attention on event-related potential (ERP) correlates of recognition memory in infants. Infants 4.5, 6, or 7.5 months of age were either familiarized with 2 stimuli that were used during later testing or presented 2 stimuli that were not use ..."
Abstract - Cited by 28 (5 self) - Add to MetaCart
for familiar-stimulus presentations, whereas the Nc did not differ for the group not receiving a familiarization exposure. Spatial independent components analysis of the electroencephelogram and “equivalent current dipole ” analysis were used to examine putative cortical sources of the ERP components

The connection between regularization operators and support vector kernels

by Alex J. Smola, Bernhard Schölkopf, Klaus-robert Müller , 1998
"... In this paper a correspondence is derived between regularization operators used in regularization networks and support vector kernels. We prove that the Green’s Functions associated with regularization operators are suitable support vector kernels with equivalent regularization properties. Moreover, ..."
Abstract - Cited by 175 (40 self) - Add to MetaCart
, the paper provides an analysis of currently used support vector kernels in the view of regularization theory and corresponding operators associated with the classes of both polynomial kernels and translation invariant kernels. The latter are also analyzed on periodical domains. As a by-product we show
Results 1 - 10 of 1,997