4,277 research outputs found
Better Document-level Sentiment Analysis from RST Discourse Parsing
Discourse structure is the hidden link between surface features and
document-level properties, such as sentiment polarity. We show that the
discourse analyses produced by Rhetorical Structure Theory (RST) parsers can
improve document-level sentiment analysis, via composition of local information
up the discourse tree. First, we show that reweighting discourse units
according to their position in a dependency representation of the rhetorical
structure can yield substantial improvements on lexicon-based sentiment
analysis. Next, we present a recursive neural network over the RST structure,
which offers significant improvements over classification-based methods.Comment: Published at Empirical Methods in Natural Language Processing (EMNLP
2015
Probing Quark Fragmentation Functions for Spin-1/2 Baryon Production in Unpolarized Annihilation
We study the measurement of the quark fragmentation functions for spin-1/2
baryon production ( and , in particular) in unpolarized
annihilation. The spin-dependent fragmentation functions
and can be probed in the process as a result of quark-antiquark
spin correlation and the weak decay of the baryons. The relevant cross section
is expressed as a product of the two-jet cross-section, the fragmentation
functions, and the differential width of the hyperon decay.Comment: 17 pages, ReVTeX with (1 figure available from authors), MIT-CTP:
#236
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The Effect of Haptic Feedback on Efficiency and Safety During Preretinal Membrane Peeling Simulation.
PurposeWe determine whether haptic feedback improves surgical performance and outcome during simulated a preretinal membrane peeling procedure.MethodsA haptic-enabled virtual reality preretinal membrane peeling simulator was developed using a surgical cockpit with two multifinger haptic devices. Six subjects (three trained retina surgeons and three nonsurgeons) performed the preretinal membrane peeling surgical procedure using two modes of operation: visual and haptic feedback, and visual feedback only.ResultsTask completion time, tool tip path trajectory, tool-retina collision force, and retinal damage were all reduced with haptic feedback used and compared to modes where haptic feedback was disabled.ConclusionsHaptic feedback improves efficiency and safety during preretinal membrane peeling simulation.Translational relevanceThese findings highlight the potential benefit of haptic feedback for improving performance and safety of vitreoretinal surgery
Classification and Asymptotic Scaling of Hadron Light-Cone Wave-Function Amplitudes
We classify the hadron light-cone wave-function amplitudes in terms of parton
helicity, orbital angular momentum, and quark flavor and color symmetries. We
show in detail how this is done for the pion, meson, nucleon, and delta
resonance up to and including three partons. For the pion and nucleon, we also
consider four-parton amplitudes. Using the scaling law derived recently, we
show how these amplitudes scale in the limit that all parton transverse momenta
become large.Comment: 28 pages, no figur
The Counting of Generalized Polarizabilities
We demonstrate a concise method to enumerate the number of generalized
polarizabilities---quantities characterizing the independent observables in
singly-virtual Compton scattering---for a target particle of arbitrary spin s.
By using crossing symmetry and J^{PC} conservation, we show that this number is
(10s+1+delta_{s,0}).Comment: 10 pages, revtex4, no figures. Version to appear in Phys. Rev. D.
Paper now divided into sections and clarifying comments added, but physics
content unchange
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