14,773 research outputs found
Picture-based task definition and parameterization support system
Applications for task definition and automation are valuable tools to automated software engineering area. This paper describes a solution to support a parameterized task definition using screen capture images. The approach allows the capture of a sequence of actions defined by the user. Through the captured sequence of actions, the approach assists in the implementation of task automation processes. Based on picture-driven computing the proposed tool aims to reduce the challenges that users face while trying to define tasks. This approach provides also a foundation for the creation of picture-driven based tests for interactive systems, enabling to test any interactive system but also allowing for the definition, parameterization and execution of tests that might involve the use of several independent interactive systems.info:eu-repo/semantics/acceptedVersio
Applications of Continuum Shell Model
The nuclear many-body problem at the limits of stability is considered in the
framework of the Continuum Shell Model that allows a unified description of
intrinsic structure and reactions. Technical details behind the method are
highlighted and practical applications combining the reaction and structure
pictures are presented.Comment: 10 pages, 3 figure
Gluon density in nuclei
In this talk we present our detail study ( theory and numbers) [1] on the
shadowing corrections to the gluon structure functions for nuclei. Starting
from rather contraversial information on the nucleon structure function which
is originated by the recent HERA data, we develop the Glauber approach for the
gluon density in a nucleus based on Mueller formula [2] and estimate the value
of the shadowing corrections in this case. Than we calculate the first
corrections to the Glauber approach and show that these corrections are big.
Based on this practical observation we suggest the new evolution equation which
takes into account the shadowing corrections and solve it. We hope to convince
you that the new evolution equation gives a good theoretical tool to treat the
shadowing corrections for the gluons density in a nucleus and, therefore, it is
able to provide the theoretically reliable initial conditions for the time
evolution of the nucleus - nucleus cascade.Comment: Talk at RHIC'96, 43 pages, 23 figure
Deeply virtual Compton scattering off nuclei
We consider the hard leptoproduction of a photon off nuclei up to spin-1. As
a new result we present here the general azimuthal angular dependence of the
differential cross section for a spin-1 target. Its twist-two Fourier
coefficients of the interference and squared deeply virtual Compton scattering
amplitude are evaluated in leading order approximation of perturbation theory
in terms of generalized parton distributions, while the pure Bethe--Heitler
cross section is exactly calculated in terms of electromagnetic form factors.
Relying on a simple model for the nucleon generalized parton distribution ,
which describes the existing DVCS data for a proton target, we estimate the
size of unpolarized cross sections, beam and longitudinal target spin as well
as unpolarized charge asymmetries for present fixed target experiments with
nuclei. These estimates are confronted with preliminary HERMES data for
deuterium and neon.Comment: 50 pages LaTeX, 7 figures, 3 tables, page style fixe
Regimes of self-organized criticality in the atmospheric convection
Large scale organization in ensembles of events of atmospheric convection can
be generated by the combined effect of forcing and of the interaction between
the raising plumes and the environment. Here the "large scale" refers to the
space extension that is larger or comparable with the basic resolved cell of a
numerical weather prediction system. Under the action of external forcing like
heating individual events of convection respond to the slow accumulation of
vapor by a threshold-type dynamics. This is due to the a time-scale separation,
between the slow drive and the fast convective response, expressed as the
"quasi-equilibrium". When there is interaction between the convection plumes,
the effect is a correlated response. We show that the correlated response have
many of the characteristics of the self-organized criticality (SOC). It is
suggested that from the SOC perspective, a description of the specific dynamics
induced by "quasi-equilibrium" can be provided by models of "punctuated
equilibrium". Indeed the Bak-Sneppen model is able to reproduce (within
reasonable approximation) two of the statistical results that have been
obtained in observations on the organized convection.
We also give detailed derivation of the equations connecting the
probabilities of the states in the update sequence of the Bak-Sneppen model
with random neighbors. This analytical framework allows the derivation of
scaling laws for the size of avalanches, a result that gives support to the SOC
interpretation of the observational data.Comment: Text prepared for the Report of COST ES0905 collaboration (2014).
Latex 45 page
TextureNet: Consistent Local Parametrizations for Learning from High-Resolution Signals on Meshes
We introduce, TextureNet, a neural network architecture designed to extract
features from high-resolution signals associated with 3D surface meshes (e.g.,
color texture maps). The key idea is to utilize a 4-rotational symmetric
(4-RoSy) field to define a domain for convolution on a surface. Though 4-RoSy
fields have several properties favorable for convolution on surfaces (low
distortion, few singularities, consistent parameterization, etc.), orientations
are ambiguous up to 4-fold rotation at any sample point. So, we introduce a new
convolutional operator invariant to the 4-RoSy ambiguity and use it in a
network to extract features from high-resolution signals on geodesic
neighborhoods of a surface. In comparison to alternatives, such as PointNet
based methods which lack a notion of orientation, the coherent structure given
by these neighborhoods results in significantly stronger features. As an
example application, we demonstrate the benefits of our architecture for 3D
semantic segmentation of textured 3D meshes. The results show that our method
outperforms all existing methods on the basis of mean IoU by a significant
margin in both geometry-only (6.4%) and RGB+Geometry (6.9-8.2%) settings
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