56,801 research outputs found
Wrapper syntax for example-based machine translation
TransBooster is a wrapper technology designed to improve the performance of wide-coverage machine translation
systems. Using linguistically motivated syntactic information, it automatically decomposes source language sentences into shorter and syntactically simpler chunks, and recomposes their translation to form target language sentences. This generally improves both the word order
and lexical selection of the translation. To date, TransBooster has been successfully applied to rule-based MT, statistical MT, and multi-engine MT. This paper presents
the application of TransBooster to Example-Based Machine Translation. In an experiment conducted on test sets
extracted from Europarl and the Penn II Treebank we show that our method can raise the BLEU score up to 3.8% relative
to the EBMT baseline. We also conduct a manual evaluation, showing that TransBooster-enhanced EBMT produces
a better output in terms of fluency than the baseline EBMT in 55% of the cases and in terms of accuracy in 53% of the
cases
3-D Magnetotelluric Investigations for geothermal exploration in Martinique (Lesser Antilles). Characteristic Deep Resistivity Structures, and Shallow Resistivity Distribution Matching Heliborne TEM Results
Within the framework of a global French program oriented towards the
development of renewable energies, Martinique Island (Lesser Antilles, France)
has been extensively investigated (from 2012 to 2013) through an integrated
multi-methods approach, with the aim to define precisely the potential
geothermal ressources, previously highlighted (Sanjuan et al., 2003). Amongst
the common investigation methods deployed, we carried out three magnetotelluric
(MT) surveys located above three of the most promising geothermal fields of
Martinique, namely the Anses d'Arlet, the Montagne Pel{\'e}e and the Pitons du
Carbet prospects. A total of about 100 MT stations were acquired showing single
or multi-dimensional behaviors and static shift effects. After processing data
with remote reference, 3-D MT inversions of the four complex elements of MT
impedance tensor without pre-static-shift correction, have been performed for
each sector, providing three 3-D resistivity models down to about 12 to 30 km
depth. The sea coast effect has been taken into account in the 3-D inversion
through generation of a 3-D resistivity model including the bathymetry around
Martinique from the coast up to a distance of 200 km. The forward response of
the model is used to calculate coast effect coefficients that are applied to
the calculated MT response during the 3-D inversion process for comparison with
the observed data. 3-D resistivity models of each sector, which are inherited
from different geological history, show 3-D resistivity distribution and
specificities related to its volcanological history. In particular, the
geothermal field related to the Montagne Pel{\'e}e strato-volcano, is
characterized by a quasi ubiquitous conductive layer and quite monotonic
typical resistivity distribution making interpretation difficult in terms of
geothermal targets. At the opposite, the resistivity distribution of Anse
d'Arlet area is radically different and geothermal target is thought to be
connected to a not so deep resistive intrusion elongated along a main
structural axis. Beside these interesting deep structures, we demonstrate,
after analyzing the results of the recent heliborne TEM survey covering the
whole Martinique, that surface resistivity distribution obtained from 3-D
inversion reproduce faithfully the resistivity distribution observed by TEM. In
spite of a very different sampling scale, this comparison illustrates the
ability of 3-D MT inversion to take into account and reproduce static shift
effects in the sub-surface resistivity distribution.Comment: Wordl Geothermal Congress 2015, Apr 2015, Melbourne, Australi
A syntactic skeleton for statistical machine translation
We present a method for improving statistical machine translation performance by using linguistically motivated syntactic information. Our algorithm recursively decomposes source language sentences into syntactically simpler and shorter chunks, and recomposes their translation to form target language sentences. This improves both the word order and lexical selection of the translation. We report statistically significant relative improvementsof 3.3% BLEU score in an experiment (English!Spanish) carried out on
an 800-sentence test set extracted from the Europarl corpus
Experiences in porting mini-applications to OpenACC and OpenMP on heterogeneous systems
This article studies mini-applicationsâMinisweep, GenASiS, GPP, and FFâthat use computational methods commonly encountered in HPC. We have ported these applications to develop OpenACC and OpenMP versions, and evaluated their performance on Titan (Cray XK7 with K20x GPUs), Cori (Cray XC40 with Intel KNL), Summit (IBM AC922 with Volta GPUs), and Cori-GPU (Cray CS-Storm 500NX with Intel Skylake and Volta GPUs). Our goals are for these new ports to be useful to both application and compiler developers, to document and describe the lessons learned and the methodology to create optimized OpenMP and OpenACC versions, and to provide a description of possible migration paths between the two specifications. Cases where specific directives or code patterns result in improved performance for a given architecture are highlighted. We also include discussions of the functionality and maturity of the latest compilers available on the above platforms with respect to OpenACC or OpenMP implementations
Multi-engine machine translation by recursive sentence decomposition
In this paper, we present a novel approach to combine the outputs of multiple MT engines into a consensus translation. In contrast to previous Multi-Engine Machine
Translation (MEMT) techniques, we do not rely on word alignments of output hypotheses, but prepare the input sentence for multi-engine processing. We do this by using a recursive decomposition algorithm that produces simple chunks as input to the MT engines. A consensus translation
is produced by combining the best chunk translations, selected through majority voting, a trigram language model
score and a confidence score assigned to each MT engine. We report statistically significant relative improvements
of up to 9% BLEU score in experiments (EnglishâSpanish) carried out on an 800-sentence test set extracted from the Penn-II Treebank
Approaches for Future Internet architecture design and Quality of Experience (QoE) Control
Researching a Future Internet capable of overcoming the current Internet limitations is a strategic
investment. In this respect, this paper presents some concepts that can contribute to provide some guidelines to
overcome the above-mentioned limitations. In the authors' vision, a key Future Internet target is to allow
applications to transparently, efficiently and flexibly exploit the available network resources with the aim to
match the users' expectations. Such expectations could be expressed in terms of a properly defined Quality of
Experience (QoE). In this respect, this paper provides some approaches for coping with the QoE provision
problem
The dynamics of spillover effects during the european sovereign debt turmoil : [draft: october 29, 2012]
In this paper we develop empirical measures for the strength of spillover effects. Modifying and extending the framework by Diebold and Yilmaz (2011), we quantify spillovers between sovereign credit markets and banks in the euro area. Spillovers are estimated recursively from a vector autoregressive model of daily CDS spread changes, with exogenous common factors. We account for interdependencies between sovereign and bank CDS spreads and we derive generalised impulse response functions. Specifically, we assess the systemic effect of an unexpected shock to the creditworthiness of a particular sovereign or country-specific bank index to other sovereign or bank CDSs between October 2009 and July 2012. Channels of transmission from or to sovereigns and banks are aggregated as a Contagion index (CI). This index is disentangled into four components, the average potential spillover: i) amongst sovereigns, ii) amongst banks, iii) from sovereigns to banks, and iv) vice-versa. We highlight the impact of policy-related events along the different components of the contagion index. The systemic contribution of each sovereign or banking group is quantified as the net spillover weight in the total net-spillover measure. Finally, the captured time-varying interdependence between banks and sovereigns emphasises the evolution of their strong nexus
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