Laboratoire Hubert Curien

Saint-Étienne, France

Laboratoire Hubert Curien

Saint-Étienne, France
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Both A.,DATEV eG | Singh K.,Fraunhofer Institute for Intelligent Analysis and Information Systems | Diefenbach D.,Laboratoire Hubert Curien | Lytra I.,Fraunhofer Institute for Intelligent Analysis and Information Systems | Lytra I.,University of Bonn
Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) | Year: 2017

Establishing a Question Answering (QA) system is time consuming. One main reason is the involved fields, as solving a Question Answering task, i.e., answering a user’s question with the correct fact(s), might require functionalities from different fields like information retrieval, natural language processing, and linked data. The architecture used for Qanary supports the derived need for easy collaboration on the level of QA processes. The focus of the design of Qanary was to enable rapid engineering of QA systems as same as a high flexibility of the component functionality. In this paper, we will present the engineering approach leading to re-usable components, high flexibility, and easy-to-compose QA systems. © Springer International Publishing AG 2017.


Wang J.,LAPLCE ENSEEIHT | Tao J.,LAPLCE ENSEEIHT | Benmohamed F.,Laboratoire Hubert Curien
2017 International Applied Computational Electromagnetics Society Symposium - Italy, ACES 2017 | Year: 2017

In this paper, we present a complex discontinuity in stratified structure by hybrid numerical methods. A rigorous analysis of the transverse operator formulations is carried on inhomogeneous coaxial cable filled with dielectric sample for propagation constants and the corresponding normalized field distributions. The new multimodal variational method is used to describe the dispersion characterization for cascaded uniaxial discontinuities, showing good agreement compared with the simulation results carried out by computer aided design software. © 2017 ACES.


Diefenbach D.,Laboratoire Hubert Curien | Singh K.,Fraunhofer Institute for Intelligent Analysis and Information Systems | Singh K.,University of Bonn | Both A.,DATEV eG | And 4 more authors.
Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) | Year: 2017

The field of Question Answering (QA) is very multidisciplinary as it requires expertise from a large number of areas such as natural language processing (NLP), artificial intelligence, machine learning, information retrieval, speech recognition and semantic technologies. In the past years a large number of QA systems were proposed using approaches from different fields and focusing on particular tasks in the QA process. Unfortunately, most of these systems cannot be easily reused, extended, and results cannot be easily reproduced since the systems are mostly implemented in a monolithic fashion, lack standardized interfaces and are often not open source or available as Web services. To address these issues we developed the knowledge-based Qanary methodology for choreographing QA pipelines distributed over the Web. Qanary employs the qa vocabulary as an exchange format for typical QA components. As a result, QA systems can be built using the Qanary methodology in a simpler, more flexible and standardized way while becoming knowledge-driven instead of being process-oriented. This paper presents the components and services that are integrated using the qa vocabulary and the Qanary methodology within the Qanary ecosystem. Moreover, we show how the Qanary ecosystem can be used to analyse QA processes to detect weaknesses and research gaps. We illustrate this by focusing on the Entity Linking (EL) task w.r.t. textual natural language input, which is a fundamental step in most QA processes. Additionally, we contribute the first EL benchmark for QA, as open source. Our main goal is to show how the research community can use Qanary to gain new insights into QA processes. © Springer International Publishing AG 2017.


Singh K.,Fraunhofer Institute for Intelligent Analysis and Information Systems | Both A.,Mercateo AG | Diefenbach D.,Laboratoire Hubert Curien | Shekarpour S.,University of Bonn
Proceedings - 2016 IEEE 10th International Conference on Semantic Computing, ICSC 2016 | Year: 2016

Question answering (QA) is one of the biggest challenges for making sense out of data. The Web of Data has attracted the attention of the QA community and recently, a number of schema-aware QA systems have been introduced. While research achievements are individually significant, yet, integrating different approaches is not possible due to lack of a systematic approach for conceptually describing QA systems. In this paper, we present a message-driven vocabulary built upon an abstract level. This vocabulary is concluded from conceptual views of different QA systems. In this way, we are enabling researchers and industry to implement message-driven QA systems and to reuse and extend different approaches without interoperability and extension concerns. © 2016 IEEE.


Benmohamed F.,Laboratoire Hubert Curien | Tao J.W.,Laboratoire Plasma et Conversion dEnergie | Vincent D.,Laboratoire Hubert Curien
2016 7th International Conference on Sciences of Electronics, Technologies of Information and Telecommunications, SETIT 2016 | Year: 2017

An efficient spectral domain method to obtain the spectral dyadic Green's function of multilayer planar structure containing an arbitrarily biased magnetic layer is developed. This method, namely the spectral domain transverse operator method, is used to formulate numerically the electromagnetic field inside each layer. The computed Green's function for an open microstrip line with magnetic substrate is compared to previously published results and excellent agreement is achieved. The Galerkin method is applied in the spectral domain to carry out the dispersion characteristics of microstrip line on magnetic substrate. Numerical results are obtained effectively and compared with previous published works. © 2016 IEEE.


Ziko I.M.,Laboratoire Hubert Curien | Fromont E.,Laboratoire Hubert Curien | Muselet D.,Laboratoire Hubert Curien | Sebban M.,Laboratoire Hubert Curien
Proceedings - 3rd IAPR Asian Conference on Pattern Recognition, ACPR 2015 | Year: 2015

When building traditional Bag of Visual Words (BOW) for image classification, the K-means algorithm is usually used on a large set of high dimensional local descriptors to build the visual dictionary. However, it is very likely that, to find a good visual vocabulary, only a sub-part of the descriptor space of each visual word is truly relevant. We propose a novel framework for creating the visual dictionary based on a spectral subspace clustering method instead of the traditional K-means algorithm. A strategy for adding supervised information during the subspace clustering process is formulated to obtain more discriminative visual words. Experimental results on real world image dataset show that the proposed framework for dictionary creation improves the classification accuracy compared to using traditionally built BOW. © 2015 IEEE.


Belaud V.,École Centrale Lyon | Valette S.,École Centrale Lyon | Stremsdoerfer G.,École Centrale Lyon | Beaugiraud B.,École Centrale Lyon | And 2 more authors.
Scanning | Year: 2014

We have investigated femtosecond (fs) laser (130-fs, 800-nm, 5-kHz) ablation of polypropylene (PP). The following laser process conditions were varied: power density and number of pulses. The morphological parameters' response (depth, ablation diameter, ablation volume) to the laser process conditions, measured by an optical profiler, was investigated by the statistical analysis technique to determine the relationship between them. For this, the simple linear regression and the multiple linear regressions are compared. The simple linear regression shows that the ablation volume follows a linear relationship with the product of the power and the number of pulse. © 2014 Wiley Periodicals, Inc.


Povarnitsyn M.E.,Moscow Institute of Physics and Technology | Itina T.E.,Laboratoire Hubert Curien | Levashov P.R.,Moscow Institute of Physics and Technology | Khishchenko K.V.,Moscow Institute of Physics and Technology
Physical Chemistry Chemical Physics | Year: 2013

Laser ablation in liquids is now commonly used to produce colloidal nanoparticles (NPs) that have found numerous applications in different areas. In experiments, NPs of different materials can be rather easily obtained by using laser systems with various pulse durations, shapes, wavelengths, and fluences. In this paper, we focus our attention on metal (gold) NPs produced by ultra-short laser pulses. To better understand the mechanisms of the NPs formation, we perform modeling of femtosecond laser interactions with a gold target in the presence of liquid (water). Simulation of the ablation process over several nanoseconds shows that most of the primary NPs originate from the ablated metastable liquid layer, whereas only a minority is formed by condensation inside the cavitation bubble. These particles will further grow/evaporate, and coagulate during a much longer collision stage in the liquid colloid. This journal is © 2013 the Owner Societies.


Farrahi K.,Goldsmiths, University of London | Emonet R.,Laboratoire Hubert Curien | Cebrian M.,Massachusetts Institute of Technology | Cebrian M.,University of California at San Diego
PLoS ONE | Year: 2014

Traditional contact tracing relies on knowledge of the interpersonal network of physical interactions, where contagious outbreaks propagate. However, due to privacy constraints and noisy data assimilation, this network is generally difficult to reconstruct accurately. Communication traces obtained by mobile phones are known to be good proxies for the physical interaction network, and they may provide a valuable tool for contact tracing. Motivated by this assumption, we propose a model for contact tracing, where an infection is spreading in the physical interpersonal network, which can never be fully recovered; and contact tracing is occurring in a communication network which acts as a proxy for the first. We apply this dual model to a dataset covering 72 students over a 9 month period, for which both the physical interactions as well as the mobile communication traces are known. Our results suggest that a wide range of contact tracing strategies may significantly reduce the final size of the epidemic, by mainly affecting its peak of incidence. However, we find that for low overlap between the face-to-face and communication interaction network, contact tracing is only efficient at the beginning of the outbreak, due to rapidly increasing costs as the epidemic evolves. Overall, contact tracing via mobile phone communication traces may be a viable option to arrest contagious outbreaks. © 2014 Farrahi et al.


Dubosclard P.,Hoffmann-La Roche | Dubosclard P.,Toulouse 1 University Capitole | Larnier S.,Hoffmann-La Roche | Larnier S.,Toulouse 1 University Capitole | And 5 more authors.
Lecture Notes in Computer Science (including subseries Lecture Notes in Artificial Intelligence and Lecture Notes in Bioinformatics) | Year: 2014

This paper presents an automatic method for visual grading, designed to solve the industrial problem of evaluation of seed lots. The sample is thrown in bulk onto a tray placed in a chamber for acquiring color image. An image processing method had been developed to separate and characterize each seed. The approach adopted for the segmentation step is based on the use of marked point processes and active contour, leading to tackle the problem by a technique of energy minimization. © Springer International Publishing Switzerland 2014.

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