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375 results on '"Montagnat, Johan"'

2. Bridging the Semantic Web and NoSQL Worlds: Generic SPARQL Query Translation and Application to MongoDB

Author

Michel, Franck, Faron-Zucker, Catherine, Montagnat, Johan, Hutchison, David, Series Editor, Kanade, Takeo, Series Editor, Kittler, Josef, Series Editor, Kleinberg, Jon M., Series Editor, Mattern, Friedemann, Series Editor, Mitchell, John C., Series Editor, Naor, Moni, Series Editor, Pandu Rangan, C., Series Editor, Steffen, Bernhard, Series Editor, Terzopoulos, Demetri, Series Editor, Tygar, Doug, Series Editor, Hameurlain, Abdelkader, editor, Wagner, Roland, editor, Morvan, Franck, editor, and Tamine, Lynda, editor

Published
2019
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3. Technical support for Life Sciences communities on a production grid infrastructure

Author

Michel, Franck, Montagnat, Johan, and Glatard, Tristan

Subjects
Computer Science - Distributed, Parallel, and Cluster Computing
Abstract

Production operation of large distributed computing infrastructures (DCI) still requires a lot of human intervention to reach acceptable quality of service. This may be achievable for scientific communities with solid IT support, but it remains a show-stopper for others. Some application execution environments are used to hide runtime technical issues from end users. But they mostly aim at fault-tolerance rather than incident resolution, and their operation still requires substantial manpower. A longer-term support activity is thus needed to ensure sustained quality of service for Virtual Organisations (VO). This paper describes how the biomed VO has addressed this challenge by setting up a technical support team. Its organisation, tooling, daily tasks, and procedures are described. Results are shown in terms of resource usage by end users, amount of reported incidents, and developed software tools. Based on our experience, we suggest ways to measure the impact of the technical support, perspectives to decrease its human cost and make it more community-specific., Comment: HealthGrid'12, Amsterdam : Netherlands (2012)

Published
2012

4. Translation of Heterogeneous Databases into RDF, and Application to the Construction of a SKOS Taxonomical Reference

Author

Michel, Franck, Djimenou, Loïc, Faron-Zucker, Catherine, Montagnat, Johan, van der Aalst, Wil, Series editor, Mylopoulos, John, Series editor, Rosemann, Michael, Series editor, Shaw, Michael J., Series editor, Szyperski, Clemens, Series editor, Monfort, Valérie, editor, Krempels, Karl-Heinz, editor, Majchrzak, Tim A., editor, and Turk, Žiga, editor

Published
2016
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5. A Mapping-Based Method to Query MongoDB Documents with SPARQL

Author

Michel, Franck, Faron-Zucker, Catherine, Montagnat, Johan, Hutchison, David, Series editor, Kanade, Takeo, Series editor, Kittler, Josef, Series editor, Kleinberg, Jon M., Series editor, Mattern, Friedemann, Series editor, Mitchell, John C., Series editor, Naor, Moni, Series editor, Pandu Rangan, C., Series editor, Steffen, Bernhard, Series editor, Terzopoulos, Demetri, Series editor, Tygar, Doug, Series editor, Weikum, Gerhard, Series editor, Hartmann, Sven, editor, and Ma, Hui, editor

Published
2016
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9. Executing Distributed Applications on Virtualized Infrastructures Specified with the VXDL Language and Managed by the HIPerNET Framework

Author

Koslovski, Guilherme, Huu, Tram Truong, Montagnat, Johan, Primet, Pascale Vicat-Blanc, Akan, Ozgur, editor, Bellavista, Paolo, editor, Cao, Jiannong, editor, Dressler, Falko, editor, Ferrari, Domenico, editor, Gerla, Mario, editor, Kobayashi, Hisashi, editor, Palazzo, Sergio, editor, Sahni, Sartaj, editor, Shen, Xuemin, editor, Stan, Mircea, editor, Xiaohua, Jia, editor, Zomaya, Albert, editor, Coulson, Geoffrey, editor, Avresky, Dimiter R., editor, Diaz, Michel, editor, Bode, Arndt, editor, Ciciani, Bruno, editor, and Dekel, Eliezer, editor

Published
2010
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10. Analyzing the EGEE Production Grid Workload: Application to Jobs Submission Optimization

Author

Lingrand, Diane, Montagnat, Johan, Martyniak, Janusz, Colling, David, Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Doug, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Frachtenberg, Eitan, editor, and Schwiegelshohn, Uwe, editor

Published
2009
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12. Performance Evaluation of Grid-Enabled Registration Algorithms Using Bronze-Standards

Author

Glatard, Tristan, Pennec, Xavier, Montagnat, Johan, Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Dough, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Larsen, Rasmus, editor, Nielsen, Mads, editor, and Sporring, Jon, editor

Published
2006
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13. Distributed Authentication in GRID5000

Author

Varrette, Sebastien, Georget, Sebastien, Montagnat, Johan, Roch, Jean-Louis, Leprevost, Franck, Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Dough, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Meersman, Robert, editor, Tari, Zahir, editor, and Herrero, Pilar, editor

Published
2005
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14. Grid Technology for Biomedical Applications

Author

Breton, Vincent, Blanchet, Christophe, Legré, Yannick, Maigne, Lydia, Montagnat, Johan, Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Dough, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Daydé, Michel, editor, Dongarra, Jack, editor, Hernández, Vicente, editor, and Palma, José M. L. M., editor

Published
2005
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15. Levelset and B-Spline Deformable Model Techniques for Image Segmentation: A Pragmatic Comparative Study

Author

Lingrand, Diane, Montagnat, Johan, Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Dough, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Kalviainen, Heikki, editor, Parkkinen, Jussi, editor, and Kaarna, Arto, editor

Published
2005
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16. Toward Accurate Segmentation of the LV Myocardium and Chamber for Volumes Estimation in Gated SPECT Sequences

Author

Lingrand, Diane, Charnoz, Arnaud, Malick Koulibaly, Pierre, Darcourt, Jacques, Montagnat, Johan, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Dough, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Pajdla, Tomás, editor, and Matas, Jiří, editor

Published
2004
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45. Editorial

Author

Magnin, Isabelle E., Clarysse, Patrick, Montagnat, Johan, Nenonen, Jukka, and Katila, Toivo

Published
2003
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46. Editorial

Author

Montagnat, Johan, Clarysse, Patrick, Nenonen, Jukka, Katila, Toivo, and Magnin, Isabelle E.

Published
2003
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47. xR2RML: Relational and Non-Relational Databases to RDF Mapping Language

Author

Michel, Franck, Djimenou, Loïc, Faron Zucker, Catherine, Montagnat, Johan, Scalable and Pervasive softwARe and Knowledge Systems (Laboratoire I3S - SPARKS), Laboratoire d'Informatique, Signaux, et Systèmes de Sophia Antipolis (I3S), Université Nice Sophia Antipolis (... - 2019) (UNS), COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Centre National de la Recherche Scientifique (CNRS)-Université Côte d'Azur (UCA)-Université Nice Sophia Antipolis (... - 2019) (UNS), COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Centre National de la Recherche Scientifique (CNRS)-Université Côte d'Azur (UCA), Web-Instrumented Man-Machine Interactions, Communities and Semantics (WIMMICS), Inria Sophia Antipolis - Méditerranée (CRISAM), Institut National de Recherche en Informatique et en Automatique (Inria)-Institut National de Recherche en Informatique et en Automatique (Inria)-Scalable and Pervasive softwARe and Knowledge Systems (Laboratoire I3S - SPARKS), COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Centre National de la Recherche Scientifique (CNRS)-Université Côte d'Azur (UCA)-Laboratoire d'Informatique, Signaux, et Systèmes de Sophia Antipolis (I3S), CNRS, Université Nice Sophia Antipolis (1965 - 2019) (UNS), and COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Centre National de la Recherche Scientifique (CNRS)-Université Côte d'Azur (UCA)-Université Nice Sophia Antipolis (1965 - 2019) (UNS)

Subjects
R2RML, [INFO.INFO-DB]Computer Science [cs]/Databases [cs.DB], ComputingMethodologies_DOCUMENTANDTEXTPROCESSING, NoSQL, linked data, [INFO.INFO-MO]Computer Science [cs]/Modeling and Simulation, RDF
Abstract

This document describes xR2RML, a language for expressing customized mappings from various types of databases (XML, object-oriented, NoSQL) to RDF datasets. xR2RML flexibly adapts to heterogeneous query languages and data models while remaining free from any specific language or syntax. It extends R2RML, the W3C recommendation for the mapping of relational databases to RDF, and relies on RML for the handling of various data representation formats.Web version available at: http://i3s.unice.fr/~fmichel/xr2rml_specification_v5.html

Published
2017

48. Un moteur de traitement de requêtes SPARQL distribuées optimisée pour les partitions de données verticales et horizontales

Author

Macina, Abdoul, Montagnat, Johan, Corby, Olivier, Scalable and Pervasive softwARe and Knowledge Systems (Laboratoire I3S - SPARKS), Laboratoire d'Informatique, Signaux, et Systèmes de Sophia Antipolis (I3S), Université Nice Sophia Antipolis (... - 2019) (UNS), COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Centre National de la Recherche Scientifique (CNRS)-Université Côte d'Azur (UCA)-Université Nice Sophia Antipolis (... - 2019) (UNS), COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Centre National de la Recherche Scientifique (CNRS)-Université Côte d'Azur (UCA), Centre National de la Recherche Scientifique (CNRS), COMUE Université Côte d'Azur (2015-2019) (COMUE UCA), Web-Instrumented Man-Machine Interactions, Communities and Semantics (WIMMICS), Inria Sophia Antipolis - Méditerranée (CRISAM), Institut National de Recherche en Informatique et en Automatique (Inria)-Institut National de Recherche en Informatique et en Automatique (Inria)-Scalable and Pervasive softwARe and Knowledge Systems (Laboratoire I3S - SPARKS), COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Centre National de la Recherche Scientifique (CNRS)-Université Côte d'Azur (UCA)-Laboratoire d'Informatique, Signaux, et Systèmes de Sophia Antipolis (I3S), Université Nice Sophia Antipolis (1965 - 2019) (UNS), and COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Centre National de la Recherche Scientifique (CNRS)-Université Côte d'Azur (UCA)-Université Nice Sophia Antipolis (1965 - 2019) (UNS)

Subjects
Distributed Query Processing, Linked data, [INFO.INFO-IR]Computer Science [cs]/Information Retrieval [cs.IR], [INFO.INFO-WB]Computer Science [cs]/Web, [INFO]Computer Science [cs], SPARQL
Abstract

National audience; An increasing number of linked knowledge bases are openly accessible over the Internet. Distributed Query Processing (DQP) techniques enable querying multiple knowledge bases coherently. However, the precise DQP semantics is often overlooked, and query performance issues arise. In this paper, we propose a DQP engine for distributed RDF graphs, adopting a SPARQL-compliant DQP semantics. We improve performance through heuristics that generate Basic Graph Pattern-based sub-queries designed to maximise the parts of the query processed by the remote endpoints. We evaluate our DQP engine considering a query set representative of most common SPARQL clauses and different data distribution schemes. Results show a significant reduction of the number of remote queries executed and the query execution time while preserving completeness.; Un nombre grandissant de bases de connaissances liées sont exposéesexposéesà travers l'Internet. Le traitement de requêtes distribuées (DQP) permet d'interroger des bases de connais-sances multiples simultanément. Cependant, la sémantique DQP précise est souvent négligée, et desprobì emes de performance doiventêtredoiventêtre traités. Dans ce papier, nous proposons un moteur DQP pour l'interrogation de graphs RDF distribués, conformè a la sé-mantique de SPARQL. Nous en améliorons la performance grâcè a des heuristiques qui génèrent des sous-requêtesrequêtes`requêtesà par-tir de schémas de graphes basiques (BGPs) demanì erè a maximiser la partie de la requête traitée par les serveurs de données distants. NousévaluonsNousévaluons notre moteur DQPàDQP`DQPà travers un ensemble de reqêtes représentatives de clauses SPARQL les plus répen-dues et des schémas de distribution des données divers. Les résultats montrent un réduction significative du nombre de requêtes exécutées et du temps de traitement sans altération de la complétude des résultats.

Published
2016

49. A SPARQL distributed query processing engine addressing both vertical and horizontal data partitions

Author

Macina, Abdoul, Montagnat, Johan, Corby, Olivier, Scalable and Pervasive softwARe and Knowledge Systems (Laboratoire I3S - SPARKS), Laboratoire d'Informatique, Signaux, et Systèmes de Sophia Antipolis (I3S), Université Nice Sophia Antipolis (... - 2019) (UNS), COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Centre National de la Recherche Scientifique (CNRS)-Université Côte d'Azur (UCA)-Université Nice Sophia Antipolis (... - 2019) (UNS), COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Centre National de la Recherche Scientifique (CNRS)-Université Côte d'Azur (UCA), Centre National de la Recherche Scientifique (CNRS), COMUE Université Côte d'Azur (2015-2019) (COMUE UCA), Web-Instrumented Man-Machine Interactions, Communities and Semantics (WIMMICS), Inria Sophia Antipolis - Méditerranée (CRISAM), Institut National de Recherche en Informatique et en Automatique (Inria)-Institut National de Recherche en Informatique et en Automatique (Inria)-Scalable and Pervasive softwARe and Knowledge Systems (Laboratoire I3S - SPARKS), and COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Centre National de la Recherche Scientifique (CNRS)-Université Côte d'Azur (UCA)-Laboratoire d'Informatique, Signaux, et Systèmes de Sophia Antipolis (I3S)

Subjects
Distributed Query Processing, Linked data, [INFO.INFO-IR]Computer Science [cs]/Information Retrieval [cs.IR], [INFO.INFO-WB]Computer Science [cs]/Web, [INFO]Computer Science [cs], SPARQL
Abstract

National audience; An increasing number of linked knowledge bases are openly accessible over the Internet. Distributed Query Processing (DQP) techniques enable querying multiple knowledge bases coherently. However, the precise DQP semantics is often overlooked, and query performance issues arise. In this paper, we propose a DQP engine for distributed RDF graphs, adopting a SPARQL-compliant DQP semantics. We improve performance through heuristics that generate Basic Graph Pattern-based sub-queries designed to maximise the parts of the query processed by the remote endpoints. We evaluate our DQP engine considering a query set representative of most common SPARQL clauses and different data distribution schemes. Results show a significant reduction of the number of remote queries executed and the query execution time while preserving completeness.; Un nombre grandissant de bases de connaissances liées sont exposéesexposéesà travers l'Internet. Le traitement de requêtes distribuées (DQP) permet d'interroger des bases de connais-sances multiples simultanément. Cependant, la sémantique DQP précise est souvent négligée, et desprobì emes de performance doiventêtredoiventêtre traités. Dans ce papier, nous proposons un moteur DQP pour l'interrogation de graphs RDF distribués, conformè a la sé-mantique de SPARQL. Nous en améliorons la performance grâcè a des heuristiques qui génèrent des sous-requêtesrequêtes`requêtesà par-tir de schémas de graphes basiques (BGPs) demanì erè a maximiser la partie de la requête traitée par les serveurs de données distants. NousévaluonsNousévaluons notre moteur DQPàDQP`DQPà travers un ensemble de reqêtes représentatives de clauses SPARQL les plus répen-dues et des schémas de distribution des données divers. Les résultats montrent un réduction significative du nombre de requêtes exécutées et du temps de traitement sans altération de la complétude des résultats.

Published
2016

50. Mapping-based SPARQL access to a MongoDB database

Author

Michel, Franck, Faron Zucker, Catherine, Montagnat, Johan, Scalable and Pervasive softwARe and Knowledge Systems (Laboratoire I3S - SPARKS), Laboratoire d'Informatique, Signaux, et Systèmes de Sophia Antipolis (I3S), Université Nice Sophia Antipolis (... - 2019) (UNS), COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Centre National de la Recherche Scientifique (CNRS)-Université Côte d'Azur (UCA)-Université Nice Sophia Antipolis (... - 2019) (UNS), COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Centre National de la Recherche Scientifique (CNRS)-Université Côte d'Azur (UCA), Web-Instrumented Man-Machine Interactions, Communities and Semantics (WIMMICS), Inria Sophia Antipolis - Méditerranée (CRISAM), Institut National de Recherche en Informatique et en Automatique (Inria)-Institut National de Recherche en Informatique et en Automatique (Inria)-Scalable and Pervasive softwARe and Knowledge Systems (Laboratoire I3S - SPARKS), COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Centre National de la Recherche Scientifique (CNRS)-Université Côte d'Azur (UCA)-Laboratoire d'Informatique, Signaux, et Systèmes de Sophia Antipolis (I3S), CNRS, Université Nice Sophia Antipolis (1965 - 2019) (UNS), and COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-COMUE Université Côte d'Azur (2015-2019) (COMUE UCA)-Centre National de la Recherche Scientifique (CNRS)-Université Côte d'Azur (UCA)-Université Nice Sophia Antipolis (1965 - 2019) (UNS)

Subjects
virtual RDF store, [INFO.INFO-DB]Computer Science [cs]/Databases [cs.DB], MongoDB, Linked Data, InformationSystems_INFORMATIONSTORAGEANDRETRIEVAL, InformationSystems_DATABASEMANAGEMENT, xR2RML, SPARQL access to legacy data, [INFO.INFO-AI]Computer Science [cs]/Artificial Intelligence [cs.AI]
Abstract

Accessing legacy data as virtual RDF stores is a key issue in the building of the Web of Data. In recent years, the MongoDB database has become a leader in the NoSQL market and the management of very large datasets, making it a significant potential contributor to the Web of Linked Data. Therefore, in this paper we address the research question of how to access arbitrary MongoDB documents with SPARQL.We propose a two-step method to (i) translate a SPARQL query into a pivot abstract query under MongoDB-to-RDF mappings represented in the xR2RML language, then (ii) translate the pivot query into a concrete MongoDB query. We elaborate on the discrepancy between the expressiveness of SPARQL and the MongoDB query language, and we show that we can always come up with a rewriting that shall produce all certain answers.

Published
2016

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