81,007 research outputs found
Vulnerable GPU Memory Management: Towards Recovering Raw Data from GPU
In this paper, we present that security threats coming with existing GPU
memory management strategy are overlooked, which opens a back door for
adversaries to freely break the memory isolation: they enable adversaries
without any privilege in a computer to recover the raw memory data left by
previous processes directly. More importantly, such attacks can work on not
only normal multi-user operating systems, but also cloud computing platforms.
To demonstrate the seriousness of such attacks, we recovered original data
directly from GPU memory residues left by exited commodity applications,
including Google Chrome, Adobe Reader, GIMP, Matlab. The results show that,
because of the vulnerable memory management strategy, commodity applications in
our experiments are all affected
Combining Visual and Textual Features for Semantic Segmentation of Historical Newspapers
The massive amounts of digitized historical documents acquired over the last
decades naturally lend themselves to automatic processing and exploration.
Research work seeking to automatically process facsimiles and extract
information thereby are multiplying with, as a first essential step, document
layout analysis. If the identification and categorization of segments of
interest in document images have seen significant progress over the last years
thanks to deep learning techniques, many challenges remain with, among others,
the use of finer-grained segmentation typologies and the consideration of
complex, heterogeneous documents such as historical newspapers. Besides, most
approaches consider visual features only, ignoring textual signal. In this
context, we introduce a multimodal approach for the semantic segmentation of
historical newspapers that combines visual and textual features. Based on a
series of experiments on diachronic Swiss and Luxembourgish newspapers, we
investigate, among others, the predictive power of visual and textual features
and their capacity to generalize across time and sources. Results show
consistent improvement of multimodal models in comparison to a strong visual
baseline, as well as better robustness to high material variance
Neutrino Mass from Laboratory: Contribution of Double Beta Decay to the Neutrino Mass Matrix
Double beta decay is indispensable to solve the question of the neutrino mass
matrix together with oscillation experiments. The most sensitive
experiment - since eight years the HEIDELBERG-MOSCOW experiment in Gran-Sasso -
already now, with the experimental limit of eV practically
excludes degenerate mass scenarios allowing neutrinos as hot dark matter
in the universe for the smallangle MSW solution of the solar neutrino problem.
It probes cosmological models including hot dark matter already now on the
level of future satellite experiments MAP and PLANCK. It further probes many
topics of beyond SM physics at the TeV scale. Future experiments should give
access to the multi-TeV range and complement on many ways the search for new
physics at future colliders like LHC and NLC. For neutrino physics some of them
(GENIUS) will allow to test almost all neutrino mass scenarios allowed by the
present neutrino oscillation experiments.Comment: 5 pages, revtex, 6 figures, Talk was presented at International
Europhysics Neutrino Oscillation Workshop, Conca Specchiulla (Otranto,
Italy), September 9-16, 2000, to be published in Nucl. Phys. B (2001), Home
Page of Heidelberg-Moscow Experiment: http://www.mpi-hd.mpg.de/non_acc
Vector and Axial-Vector Spectral Functions and QCD
We present new results of the tau hadronic spectral function analysis using
data accumulated by the ALEPH detector at LEP during the years 1991-94. In
addition to the vector spectral functions, the axial-vector spectral functions
and, separately, the tau --> 3pi nu as well as the tau --> pi 2pi0 nu spectral
functions are determined from their respective unfolded, i.e., physical
invariant mass spectra. The spectral functions are applied to QCD chiral sum
rules in order to extract information about saturation at the tau mass scale.
Using the the semi-leptonic tau decay rate for vector and axial-vector currents
in addition to spectral moments, we obtain precise measurements of the strong
coupling constant alpha_s(M_tau) and the contributing non-perturbative power
terms. The evolution to the Z mass yields alpha_s(M_Z) = 0.1219 +/- 0.0019.Comment: 15 pages, 12 figures, LaTex, Talk given at the Fourth International
Workshop on Tau Lepton Physics (TAU96), Colorado, September 199
Text Line Segmentation of Historical Documents: a Survey
There is a huge amount of historical documents in libraries and in various
National Archives that have not been exploited electronically. Although
automatic reading of complete pages remains, in most cases, a long-term
objective, tasks such as word spotting, text/image alignment, authentication
and extraction of specific fields are in use today. For all these tasks, a
major step is document segmentation into text lines. Because of the low quality
and the complexity of these documents (background noise, artifacts due to
aging, interfering lines),automatic text line segmentation remains an open
research field. The objective of this paper is to present a survey of existing
methods, developed during the last decade, and dedicated to documents of
historical interest.Comment: 25 pages, submitted version, To appear in International Journal on
Document Analysis and Recognition, On line version available at
http://www.springerlink.com/content/k2813176280456k3
A 1.82 m^2 ring laser gyroscope for nano-rotational motion sensing
We present a fully active-controlled He-Ne ring laser gyroscope, operating in
square cavity 1.35 m in side. The apparatus is designed to provide a very low
mechanical and thermal drift of the ring cavity geometry and is conceived to be
operative in two different orientations of the laser plane, in order to detect
rotations around the vertical or the horizontal direction. Since June 2010 the
system is active inside the Virgo interferometer central area with the aim of
performing high sensitivity measurements of environmental rotational noise. So
far, continuous not attempted operation of the gyroscope has been longer than
30 days. The main characteristics of the laser, the active remote-controlled
stabilization systems and the data acquisition techniques are presented. An
off-line data processing, supported by a simple model of the sensor, is shown
to improve the effective long term stability. A rotational sensitivity at the
level of ten nanoradiants per squareroot of Hz below 1 Hz, very close to the
required specification for the improvement of the Virgo suspension control
system, is demonstrated for the configuration where the laser plane is
horizontal
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