The Experts below are selected from a list of 13251 Experts worldwide ranked by ideXlab platform
Michael Gastpar - One of the best experts on this subject based on the ideXlab platform.
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uncoded transmission is exactly optimal for a simple gaussian sensor network
2008Co-Authors: Michael GastparAbstract:A single memoryless Gaussian source is observed by many terminals, subject to independent Gaussian observation noises. The terminals are linked to a fusion center via a standard Gaussian multiple-access channel. The fusion center needs to recover the underlying Gaussian source with respect to mean-squared error. In this correspondence, a theorem of Witsenhausen is shown to imply that an optimal communication strategy is uncoded transmission, i.e., each terminal's channel input is merely a Scaled Version of its noisy observation.
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uncoded transmission is exactly optimal for a simple gaussian sensor network
2007Co-Authors: Michael GastparAbstract:One of the simplest sensor network models has one single underlying Gaussian source of interest, observed by many sensors, subject to independent Gaussian observation noise. The sensors communicate over a standard Gaussian multiple-access channel to a fusion center whose goal is to estimate the underlying source with respect to mean-squared error. In this note, a theorem of Witsenhausen is shown to imply that an optimal communication strategy is uncoded transmission, i.e., each sensors' channel input is merely a Scaled Version of its noisy observation.
C Pintor - One of the best experts on this subject based on the ideXlab platform.
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the factor structure of the general health questionnaire ghq a Scaled Version for general practice in spain
2006Co-Authors: J D Molina, C Andraderosa, S Gonzalezparra, Hilario Blascofontecilla, M A Real, C PintorAbstract:Abstract Background The 28-item Version of the General Health Questionnaire (GHQ-28) developed by Goldberg and Hillier in 1979 is constructed on the basis of a principal components analysis of the GHQ-60. When used on a Spanish population, a translation of the GHQ-28 developed for an English population may lead to worse predictive values. Methods We used our Spanish sample to replicate the entire process of construction of the GHQ-28 administered in a primary-care setting. Results Two shorter Versions were proposed: one with six scales and 30 items, and the other with four scales and 28 items. Conclusions The resulting GHQ-28 was a successful adaptation for use on the Spanish sample. When compared with the original Version, only 21 items were the same. Moreover, contrary to the English Version, which groups sleep problems and anxiety in the same scale, a scale with items related exclusively to ‘Sleep disturbances’ was found.
G. Papathanasiou - One of the best experts on this subject based on the ideXlab platform.
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Hexagon OPE Resummation and Multi-Regge Kinematics
2016Co-Authors: J. M. Drummond, G. PapathanasiouAbstract:We analyse the OPE contribution of gluon bound states in the double scaling limit of the hexagonal Wilson loop in planar N=4 super Yang-Mills theory. We provide a systematic procedure for perturbatively resumming the contributions from single-particle bound states of gluons and expressing the result order by order in terms of two-variable polylogarithms. We also analyse certain contributions from two-particle gluon bound states and find that, after analytic continuation to the $2\to 4$ Mandelstam region and passing to multi-Regge kinematics (MRK), only the single-particle gluon bound states contribute. From this double-Scaled Version of MRK we are able to reconstruct the full hexagon remainder function in MRK up to five loops by invoking single-valuedness of the results.
J D Molina - One of the best experts on this subject based on the ideXlab platform.
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the factor structure of the general health questionnaire ghq a Scaled Version for general practice in spain
2006Co-Authors: J D Molina, C Andraderosa, S Gonzalezparra, Hilario Blascofontecilla, M A Real, C PintorAbstract:Abstract Background The 28-item Version of the General Health Questionnaire (GHQ-28) developed by Goldberg and Hillier in 1979 is constructed on the basis of a principal components analysis of the GHQ-60. When used on a Spanish population, a translation of the GHQ-28 developed for an English population may lead to worse predictive values. Methods We used our Spanish sample to replicate the entire process of construction of the GHQ-28 administered in a primary-care setting. Results Two shorter Versions were proposed: one with six scales and 30 items, and the other with four scales and 28 items. Conclusions The resulting GHQ-28 was a successful adaptation for use on the Spanish sample. When compared with the original Version, only 21 items were the same. Moreover, contrary to the English Version, which groups sleep problems and anxiety in the same scale, a scale with items related exclusively to ‘Sleep disturbances’ was found.
J. M. Drummond - One of the best experts on this subject based on the ideXlab platform.
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Hexagon OPE Resummation and Multi-Regge Kinematics
2016Co-Authors: J. M. Drummond, G. PapathanasiouAbstract:We analyse the OPE contribution of gluon bound states in the double scaling limit of the hexagonal Wilson loop in planar N=4 super Yang-Mills theory. We provide a systematic procedure for perturbatively resumming the contributions from single-particle bound states of gluons and expressing the result order by order in terms of two-variable polylogarithms. We also analyse certain contributions from two-particle gluon bound states and find that, after analytic continuation to the $2\to 4$ Mandelstam region and passing to multi-Regge kinematics (MRK), only the single-particle gluon bound states contribute. From this double-Scaled Version of MRK we are able to reconstruct the full hexagon remainder function in MRK up to five loops by invoking single-valuedness of the results.
