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Fast QR Factorization Of Low-Rank Changes Of Vandermonde-Like Matrices

by Luca Gemignani
"... . This paper is concerned with the solution of linear systems with coefficient matrices which are Vandermonde-like matrices modified by adding low-rank corrections. Hereafter we refer to these matrices as to modified Vandermonde-like matrices. The solution of modified Vandermondelike linear systems ..."
Abstract - Cited by 2 (0 self) - Add to MetaCart
. This paper is concerned with the solution of linear systems with coefficient matrices which are Vandermonde-like matrices modified by adding low-rank corrections. Hereafter we refer to these matrices as to modified Vandermonde-like matrices. The solution of modified Vandermondelike linear systems

Low-rank

by Rikard Falkeborn, Johan Löfberg, Anders Hansson
"... exploitation in semidefinite programming for control ..."
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exploitation in semidefinite programming for control

Efficient SVM training using low-rank kernel representations

by Shai Fine, Katya Scheinberg, Nello Cristianini, John Shawe-taylor, Bob Williamson - Journal of Machine Learning Research , 2001
"... SVM training is a convex optimization problem which scales with the training set size rather than the feature space dimension. While this is usually considered to be a desired quality, in large scale problems it may cause training to be impractical. The common techniques to handle this difficulty ba ..."
Abstract - Cited by 244 (3 self) - Add to MetaCart
basically build a solution by solving a sequence of small scale subproblems. Our current effort is concentrated on the rank of the kernel matrix as a source for further enhancement of the training procedure. We first show that for a low rank kernel matrix it is possible to design a better interior point

A PERFORMANCE EVALUATION OF LOCAL DESCRIPTORS

by Krystian Mikolajczyk, Cordelia Schmid , 2005
"... In this paper we compare the performance of descriptors computed for local interest regions, as for example extracted by the Harris-Affine detector [32]. Many different descriptors have been proposed in the literature. However, it is unclear which descriptors are more appropriate and how their perfo ..."
Abstract - Cited by 1752 (53 self) - Add to MetaCart
that it outperforms the original method. Furthermore, we observe that the ranking of the descriptors is mostly independent of the interest region detector and that the SIFT based descriptors perform best. Moments and steerable filters show the best performance among the low dimensional descriptors.

Model-Based Analysis of Oligonucleotide Arrays: Model Validation, Design Issues and Standard Error Application

by Cheng Li, Wing Hung Wong , 2001
"... Background: A model-based analysis of oligonucleotide expression arrays we developed previously uses a probe-sensitivity index to capture the response characteristic of a specific probe pair and calculates model-based expression indexes (MBEI). MBEI has standard error attached to it as a measure of ..."
Abstract - Cited by 751 (28 self) - Add to MetaCart
correlations with the original 20-probe PM/MM difference model. MBEI method is able to extend the reliable detection limit of expression to a lower mRNA concentration. The standard errors of MBEI can be used to construct confidence intervals of fold changes, and the lower confidence bound of fold change is a

Some Evidence on the Importance of Sticky Prices

by Mark Bils, Peter J. Klenow - JOURNAL OF POLITICAL ECONOMY , 2004
"... We examine the frequency of price changes for 350 categories of goods and services covering about 70 % of consumer spending, based on unpublished data from the BLS for 1995 to 1997. Compared with previous studies we find much more frequent price changes, with half of goods' prices lasting less ..."
Abstract - Cited by 734 (15 self) - Add to MetaCart
We examine the frequency of price changes for 350 categories of goods and services covering about 70 % of consumer spending, based on unpublished data from the BLS for 1995 to 1997. Compared with previous studies we find much more frequent price changes, with half of goods' prices lasting less

The modern industrial revolution, exit, and the failure of internal control systems

by Michael C. Jensen - JOURNAL OF FINANCE , 1993
"... Since 1973 technological, political, regulatory, and economic forces have been changing the worldwide economy in a fashion comparable to the changes experienced during the nineteenth century Industrial Revolution. As in the nineteenth century, we are experiencing declining costs, increaing average ( ..."
Abstract - Cited by 932 (7 self) - Add to MetaCart
Since 1973 technological, political, regulatory, and economic forces have been changing the worldwide economy in a fashion comparable to the changes experienced during the nineteenth century Industrial Revolution. As in the nineteenth century, we are experiencing declining costs, increaing average

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 485 (6 self) - Add to MetaCart
due to the lack of a systematic framework that can accommodate noise, variability, and low replication often typical of microarray data. Results: We develop a Bayesian probabilistic framework for microarray data analysis. At the simplest level, we model log-expression values by independent normal

Information Technology, Workplace Organization, and the Demand for Skilled Labor: Firm-Level Evidence

by Timothy F. Bresnahan, Erik Brynjolfsson, Lorin M. Hitt - Journal of Economics , 2002
"... We investigate the hypothesis that the combination of three related innovations—1) information technology (IT), 2) complementary workplace reorganization, and 3) new products and services — constitute a signi�cant skill-biased technical change affecting labor demand in the United States. Using detai ..."
Abstract - Cited by 589 (15 self) - Add to MetaCart
We investigate the hypothesis that the combination of three related innovations—1) information technology (IT), 2) complementary workplace reorganization, and 3) new products and services — constitute a signi�cant skill-biased technical change affecting labor demand in the United States. Using

String theory and noncommutative geometry

by Nathan Seiberg, Edward Witten - JHEP , 1999
"... We extend earlier ideas about the appearance of noncommutative geometry in string theory with a nonzero B-field. We identify a limit in which the entire string dynamics is described by a minimally coupled (supersymmetric) gauge theory on a noncommutative space, and discuss the corrections away from ..."
Abstract - Cited by 801 (8 self) - Add to MetaCart
this limit. Our analysis leads us to an equivalence between ordinary gauge fields and noncommutative gauge fields, which is realized by a change of variables that can be described explicitly. This change of variables is checked by comparing the ordinary Dirac-Born-Infeld theory with its noncommutative
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