Results 1 - 10 of 1,079

Clustering by passing messages between data points

by Brendan J. Frey, Delbert Dueck - Science , 2007
"... Clustering data by identifying a subset of representative examples is important for processing sensory signals and detecting patterns in data. Such “exemplars ” can be found by randomly choosing an initial subset of data points and then iteratively refining it, but this works well only if that initi ..."
Abstract - Cited by 696 (8 self) - Add to MetaCart
so in less than one-hundredth the amount of time. Clustering data based on a measure of similarity is a critical step in scientific data analysis and in engineering systems. A common approach is to use data to learn a set of centers such that the sum of

Modeling multi-step relevance propagation for expert finding

by Pavel Serdyukov, Henning Rode, Djoerd Hiemstra - In CIKM ’08 , 2008
"... An expert finding system allows a user to type a simple text query and retrieve names and contact information of individuals that possess the expertise expressed in the query. This paper proposes a novel approach to expert finding in large enterprises or intranets by modeling candidate experts (pers ..."
Abstract - Cited by 32 (3 self) - Add to MetaCart
(persons), web documents and various relations among them with so-called expertise graphs. As distinct from the stateof-the-art approaches estimating personal expertise through one-step propagation of relevance probability from documents to the related candidates, our methods are based on the principle

Propagation Algorithms for Variational Bayesian Learning

by Zoubin Ghahramani, Matthew J. Beal - In Advances in Neural Information Processing Systems 13 , 2001
"... Variational approximations are becoming a widespread tool for Bayesian learning of graphical models. We provide some theoretical results for the variational updates in a very general family of conjugate-exponential graphical models. We show how the belief propagation and the junction tree algorithms ..."
Abstract - Cited by 139 (20 self) - Add to MetaCart
algorithms can be used in the inference step of variational Bayesian learning. Applying these results to the Bayesian analysis of linear-Gaussian state-space models we obtain a learning procedure that exploits the Kalman smoothing propagation, while integrating over all model parameters. We demonstrate how

A hexagon model for 3D Lorentzian quantum cosmology

by B. Dittrich, R. Loll - PHYS. REV. D , 2002
"... We formulate a dynamically triangulated model of three-dimensional Lorentzian quantum gravity whose spatial sections are flat two-tori. It is shown that the combinatorics involved in evaluating the one-step propagator (the transfer matrix) is that of a set of vicious walkers on a two-dimensional lat ..."
Abstract - Cited by 19 (6 self) - Add to MetaCart
We formulate a dynamically triangulated model of three-dimensional Lorentzian quantum gravity whose spatial sections are flat two-tori. It is shown that the combinatorics involved in evaluating the one-step propagator (the transfer matrix) is that of a set of vicious walkers on a two

A Numerical Study of One-Step Models of Polymerization: Frontal versus Bulk Mode”. Elsevier Physica D.

by Stephen A Cardarelli , Dmitry Golovaty , L K Gross , Vitaliy T Gyrya , Jianping Zhu , 2005
"... Abstract In free-radical polymerization, a monomer-initiator mixture is converted into a polymer. Depending on initial and boundary conditions, free-radical polymerization can occur either in a bulk mode (BP) or in a frontal mode (FP) via a propagating selfsustaining reaction front. The main goal o ..."
Abstract - Cited by 3 (1 self) - Add to MetaCart
polymerization mechanism. A mathematical model of one-step free-radical frontal polymerization is identical to the model of gasless combustion, so bulk reactions play a role in the latter context, as well. However, fronts propagate much faster in combustion than in polymerization, and slow bulk reactions

Forward link performance of satellite CDMA with linear interference suppression and one-step power control

by Weimin Xiao, Michael L. Honig - IEEE Trans. Wireless Commun , 2002
"... (CDMA) is a strong candidate for both terrestrial and satellite components of UMTS. The forward-link capacity of a satellite DS-CDMA system with a conventional matched filter (MF) receiver is limited by interference from adjacent beams and possibly overlapping beams from multiple satellites. In this ..."
Abstract - Cited by 2 (2 self) - Add to MetaCart
density ratio at the mobile receiver. We consider a “one-step ” power adjustment algorithm which attempts to compensate for random shadowing and path loss, and compare the associated performance of the MMSE and MF receivers. Dual-satellite diversity is also considered. The effect of code rate

The demonstration of one-step growth curves of influenza vires through the blocking effect of irradiated vires on further infection

by Bx Werner Henle, Gertrude Henle, Am Evelyn B. Rosen'berg , 1947
"... Previous studies (1, 2) have shown that the mechanism of infection of susceptible host ceils by influenza virus can be divided into at least four separate phases: (I) the adsorption of the virus onto the host cells (2-4); (H) the development of changes in the host cells which alter their function (d ..."
Abstract - Cited by 3 (0 self) - Add to MetaCart
therefore been directed chiefly toward an analysis of the later steps in the infectious process, the intracellular propagation of the virus and its release from the infected

ONE-STEP GROWTH CURVES OF VARIOUS STRAINS OF IN- FLUENZA A AND B VIRUSES AND THEIR INHIBITION BY INACTIVATED VIRUS OF THE HOMOLOGOUS TYPE*

by Werner Henle, Azcd Evelyn, B. Rosenberg
"... Studies on the propagation of influenza viruses in the chick embryo (I) have shown that under certain conditions one-step growth curves may be obtained which are similar in principle to those observed in bacterial host-virus systems (2, 3). Upon aUantoic injection of either the PR8 strain of influen ..."
Abstract - Add to MetaCart
Studies on the propagation of influenza viruses in the chick embryo (I) have shown that under certain conditions one-step growth curves may be obtained which are similar in principle to those observed in bacterial host-virus systems (2, 3). Upon aUantoic injection of either the PR8 strain

Tracking Loose-limbed People

by Leonid Sigal, Sidharth Bhatia, Stefan Roth, Michael J. Black, Michael Isard , 2004
"... We pose the problem of 3D human tracking as one of inference in a graphical model. Unlike traditional kinematic tree representations, our model of the body is a collection of loosely-connected limbs. Conditional probabilities relating the 3D pose of connected limbs are learned from motioncaptured tr ..."
Abstract - Cited by 191 (7 self) - Add to MetaCart
We pose the problem of 3D human tracking as one of inference in a graphical model. Unlike traditional kinematic tree representations, our model of the body is a collection of loosely-connected limbs. Conditional probabilities relating the 3D pose of connected limbs are learned from motioncaptured

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
image for each array element using discrete Fourier transform (DFT). The second step then is to create a full-FOV image from the set of intermediate images. To achieve this one must undo the signal superposition underlying the fold-over effect. That is, for each pixel in the reduced FOV the signal
Results 1 - 10 of 1,079