855,939 research outputs found
Global Normalization of Convolutional Neural Networks for Joint Entity and Relation Classification
We introduce globally normalized convolutional neural networks for joint
entity classification and relation extraction. In particular, we propose a way
to utilize a linear-chain conditional random field output layer for predicting
entity types and relations between entities at the same time. Our experiments
show that global normalization outperforms a locally normalized softmax layer
on a benchmark dataset.Comment: EMNLP 201
Evaluation of pre/post-fire differenced spectral indices for assessing burn severity in a Mediterranean environment with landsat thematic mapper
In this study several pre/post-fire differenced spectral indices for assessing burn severity in a Mediterranean environment are evaluated. GeoCBI (Geo Composite Burn Index) field data of burn severity were correlated with remotely sensed measures, based on the NBR (Normalized Burn Ratio), the NDMI (Normalized Difference Moisture Index) and the NDVI (Normalized Difference Vegetation Index). In addition, the strength of the correlation was evaluated for specific fuel types and the influence of the regression model type is pointed out. The NBR was the best remotely sensed index for assessing burn severity, followed by the NDMI and the NDVI. For this case study of the 2007 Peloponnese fires, results show that the GeoCBI-dNBR (differenced NBR) approach yields a moderate-high R(2) = 0.65. Absolute indices outperformed their relative equivalents, which accounted for pre-fire vegetation state. The GeoCBI-dNBR relationship was stronger for forested ecotypes than for shrub lands. The relationship between the field data and the dNBR and dNDMI (differenced NDMI) was nonlinear, while the GeoCBI-dNDVI (differenced NDVI) relationship appeared linear
How Good are Present Analytical QCD-Predictions on Fluctuations in Angular Intervals ?
Results on two-particle angular correlations in jet cones and on multiplicity
fluctuations in one- and two- dimensional angular intervals, delivered by three
experiments (DELPHI, L3 and ZEUS, at from few to 183 GeV) are
compared to present existing analytical QCD calculations, using the LPHD
hypothesis. Two different types of functions have been tested. While the
differentially normalized correlation functions show substantial deviations
from the predictions, a globally normalized correlation function agrees
surprisingly well. The role of the QCD parameters , and
is discussed. The necessity to include full energy-momentum conservation
into the analytical calculations is stressed.Comment: 13 pages (LaTeX), 11 figures, uses sprocl.sty. Miniraporteur-talk
given at the Internat. Symposium of Multiparticle Dynamics, Delphi, Greece,
6-11 Sept. 1998 (to appear in Proceedings
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