Grégory Smits

Grégory Smits - IRISA University of Rennes 1
Grégory Smits - IRISA University of Rennes 1

Current position

I received a Ph.D degree in computer science from the University of Caen (France) in 2008. I am currently an Associate Professor (HDR) at IUT Lannion (University of Rennes 1, France) and a member of the research laboratory named IRISA (Institut de Recherche en Informatique et Systèmes Aléatoires). Within the SHAMAN team, my research works mainly concern the extension of usual relational database systems for fuzzy querying and cooperative answering.

Research activities

Publications (show the content of this section)

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  • Book chapters
    • Olivier Pivert and Grégory Smits. Fuzzy Extensions of Databases. In Fuzzy Approaches for Soft Computing and Approximate Reasoning: Theories and Applications (pp. 191-200). Springer, Cham.
    • Olivier Pivert and Grégory Smits, How to Efficiently Diagnose and Repair Fuzzy Database Queries that Fail. Studies in Fuzziness and Soft Computing, Vol. 326, E. Tamir et al. (Eds): Fifty years of fuzzy logic and its applications, pp. 499-517 (2015).
    • Grégory Smits, Olivier Pivert, Allel HadjAli: Fuzzy Cardinalities as a Basis to Cooperative Answering. Flexible Approaches in Data, Information and Knowledge Management, pp. 261-289 (2013).
  • Journal articles
    • O. Pivert, E. Scholly, G. Smits, & V. Thion. Fuzzy Quality-Aware Queries to Graph Databases. Information Sciences, (2020).
    • A. Moreau, O.Pivert and G. Smits. Linguistically Characterizating Clusters of Database Query Answers. Fuzzy Sets and Systems, (2019).
    • G. Smits, O. Pivert, R.R. Yager and P. Nerzic. A Soft Computing Approach to Big Data Summarization. Fuzzy Sets and Systems, (2018).
    • G. Smits, and O.Pivert. Une approche coopérative d'aide à la réparation de requêtes floues. Revue Ingénierie des Systèmes d'Information, 21(3), 11-30 (2016).
    • G. Smits, O. Pivert, and T. Girault. Interrogation floue de bases de données relationnelles : de la théorie à la pratique. Revue d’Intelligence Artificielle, 29(5), 569-593 (2015).
    • P. Bosc, O. Pivert, and G. Smits: An Approach to Database Preference Queries Based on an Outranking Relation. International Journal of Computational Intelligence Systems, Atlantis Press, 5 (4), pp.789-804 (2012).
    • O. Pivert, and G. Smits (2012, January). SQLSP: A Preference Query Language with Symbolic Score, Int. J. Computational Intelligence Systems 5(4): 789-804.
    • P. Bosc, A. Hadjali, O. Pivert, and G. Smits. An approach based on predicate correlation to the reduction of plethoric answer sets. In F. Guillet, G. Ritschard, and D. Zighed, editors, Advances in Knowledge Discovery and Management Vol. 2, Studies in Computational Intelligence, vol. 398, pages 213-234. Springer, 2012.
    • J. Heinecke, G. Smits, C. Chardenon, E. Guimier De Neef, E. Maillebuau et M. Boualem: TiLT: a natural language processing platform. TAL 49(2): 17-41 (2008).
  • Conference papers

      2021
    • Véronne Yepmo, Grégory Smits, and Olivier Pivert. A Classification of Anomaly Explanation Methods. Workshop Advances in Interpretable Machine Learning and Artificial Intelligence (AIMLAI) at ECML/PKDD, Sep 2021, online.
    • Grégory Smits, Marie-Jeanne Lesot, Olivier Pivert, and Ronald Yager. Requêtes flexibles avec des concepts disjonctifs. Actes des Rencontres Francophones sur la Logique Floue et ses Applications (LFA'21), Oct 2021, Paris, France.
    • Grégory Smits, Marie-Jeanne Lesot, Olivier Pivert, and Ronald Yager. Flexible Querying using Disjunctive Concepts. International Conference on Flexible Query Answering Systems, Sep 2021, Bratislava, Slovakia.

      2020
    • A. Shukla, G. Smits, O. Pivert and M.J. Lesot. Explaining Data Regularities and Anomalies. In Proc. of the 29th IEEE International Conference on Fuzzy Systems (Fuzz-IEEE'19), Galway, Scotland, 2020.
    • G. Smits, R. R. Yager, M.J. Lesot and O. Pivert. Concept Membership Modeling Using a Choquet Integral. In Proc. of the 18th International Conference on Information Processing and Management of Uncertainty in Knowledge-Based Systems (IPMU’20), Lisboa, Portugal, 2020.

      2019
    • M.-J. Lesot, G. Smits, P. Nerzic and O. Pivert. Génération efficace d’estimations fiables de résumés linguistiques. Actes des Rencontres Francophones sur la Logique Floue et ses Applications (LFA'19), Alès, France, 2019.
    • E. Doumard, O. Pivert, G. Smits and V. Thion. Processing Fuzzy Relational Queries Using Fuzzy Views. In Proc. of the 28th IEEE International Conference on Fuzzy Systems (Fuzz-IEEE'19), New-Orleans, USA, 2019.
    • G. Smits, P. Nerzic, M.J. Lesot and O. Pivert. FRELS: Fast and Reliable Estimated inguistic Summaries. In Proc. of the 28th IEEE International Conference on Fuzzy Systems (Fuzz-IEEE'19), New-Orleans, USA, 2019.

      • 2018
    • G. Smits, P. Nerzic, O. Pivert and M.-J. Lesot. Génération efficace de résumés linguistiques estimés. Actes des Rencontres Francophones sur la Logique Floue et ses Applications (LFA'18), Arras, France, 2018.
    • G. Smits, O. Pivert and T. Ngoc Duong. Mesurer la dissimilarité au niveau d'une partition floue. Actes des Rencontres Francophones sur la Logique Floue et ses Applications (LFA'18), Arras, France, 2018.
    • G. Smits, P. Nerzic, O. Pivert and M.J. Lesot. Efficient Generation of Reliable Estimated Linguistic Summaries. In Proc. of the 27th IEEE International Conference on Fuzzy Systems (Fuzz-IEEE'18), Rio de Janeiro, Brazil, 2018.
    • G. Smits, O. Pivert and T. Ngoc Duong. On Dissimilarity Measures at the Fuzzy Partition Level. In Proc. of the 17th International Conference on Information Processing and Management of Uncertainty in Knowledge-Based Systems (IPMU’18), Cadiz, Spain, 2018.
    • G. Smits et O. Pivert. Exploration de résumés personnalisés de données. Actes de la 18eme conférence internationale sur l'extraction et la gestion de connaissances, Paris, France, 2018.
    • A. Moreau, O. Pivert, and G. Smits. Fuzzy Query By Example. Proc. of the 33rd ACM/SIGAPP Symposium On Applied Computing (SAC'18), Pau, France, 2018.

      • 2017
    • G Smits, O. Pivert, and P. Nerzic. Calcul, stockage et utilisation efficaces de résumés linguistiques de données massives. Actes des Rencontres Francophones sur la Logique Floue et ses Applications (LFA'17), Amiens, France, 2017.
    • G. Smits, M.J. Lesot, and O. Pivert. Vocabulary Elicitation for Informative Descriptions of Classes. In Proc. of the joint 17th World Congress of International Fuzzy Systems Association and 9th International Conference on Soft Computing and Intelligent Systems (IFSA-SCSI'17), Otsu, Japan, 2017.
    • G. Smits, R.R. Yager, and O. Piver. Interactive Data Exploration on Top of Linguistic Summaries. In Proc. of the 26th IEEE International Conference on Fuzzy Systems (Fuzz-IEEE'17), Naples, Italia, 2017.
    • A. Moreau, O. Pivert, and G. Smits. A Typicality-Based Recommendation Approach Leveraging Demographic Data. In Proc. of the 12th International Conference on Flexible Query Answering Systems (FQAS'17), London, England, 2017.

      • 2016
    • K. Dramé, G. Smits and O. Pivert. IKEYS: Interactive Keyword Search Dedicated to Corporate Data. In Proc. of the 20th International Conference on Knowledge Engineering and Knowledge Management (EKAW’16), 19-23 November 2016, Bologna, Italy.
    • O. Pivert, O. Slama, G. Smits, and V. Thion. A Fuzzy Extension of SPARQL for Querying Gradual RDF Data.In Proc. of the IEEE International Conference on Research Challenges in Information Science, 1-3 June 2016, Grenoble, France.
    • A. Moreau, O. Pivert, and G. Smits. Caractérisation floue de clusters de réponses. Actes des Rencontres Francophones sur la Logique Floue et ses Applications (LFA'16), 3-4 novembre 2016, La Rochelle, France.
    • O. Pivert, O. Slama, G. Smits, and V. Thion. SUGAR: A Graph Database Fuzzy Querying System.In Proc. of the IEEE International Conference on Research Challenges in Information Science, 1-3 June 2016, Grenoble, France.
    • G. Smits, O. Pivert, and R.R. Yager. A Soft Computing Approach to Agile Business Intelligence. In Proc. of the 25th IEEE International Conference on Fuzzy Systems (Fuzz-IEEE'16), Vancouver, Canada, 2016.
    • A. Moreau, O. Pivert, and G. Smits. A Fuzzy Approach to the Characterization of Database Query Answers. In Proc. of the 16th International Conference on Information Processing and Management of Uncertainty in Knowledge-Based Systems (IPMU’16), Eindhoven, The Netherlands, 2016.

      • 2015
    • K. Dramé, G. Smits and O. Pivert. Coarse to Fine Keyword Queries with User Interactions. In Proc. of the 17th International Conference on Information Integration and Web-based Applications & Services (iiWas'15), Bruxelles, Belgium, 2015.
    • A. Moreau, O. Pivert, and G. Smits. A Clustering-Based Approach to the Explanation of Database Query Answers. In Proc. of the 11th International Conference on Flexible Query Answering Systems (FQAS'13), Cracow, Poland, 2015.
    • O. Pivert, and G. Smits. Réparation efficace de requêtes floues, In Actes des Rencontres Francophones sur la Logique Floue et ses Applications (LFA'15), Poitiers, France, 2015.
    • G. Smits, and O. Pivert. Explications linguistiques et graphiques de groupes de données, In Actes des Rencontres Francophones sur la Logique Floue et ses Applications (LFA'15), Poitiers, France, 2015.
    • O. Pivert, G. Smits, and V. Thion. Expression and Efficient Processing of Fuzzy Queries in a Graph Database Context, Proc. of the 24th IEEE International Conference on Fuzzy Systems (Fuzz-IEEE'15), Istanbul, Turkey, 2015.
    • G. Smits, O. Pivert, and V. Thion. Connected Keywords, In Proc. of the 9th IEEE International Conference on Research Challenges in Information Science (RCIS’15), Athens, Greece, 2015.
    • G. Smits and O. Pivert. Linguistic and Graphical Explanation of a Cluster-Based Data Structure, In Proc. of the 9th International Conference on Scalable Uncertainty Management (SUM’15), Quebec City, Canada, 2015.
    • G. Smits and O. Pivert. Une approche coopérative d'aide à la réparation de requêtes floues. In Actes des 31e Journées Bases de Données Avancées (BDA'15), Île de Porquerolles, France, 2015.

      • 2014
    • G. Smits, O. Pivert, H. Jaudoin, and F. Paulus. AGGREGO SEARCH: Interactive Keyword Query Construction. In Proc. of the 17th International Conference on Extending Database Technology (EDBT'14), demo session, Athens, Greece, pages 636-639, 2014.
    • G. Smits, O. Pivert, and M.-J. Lesot. A Vocabulary Revision Method Based on Modality Splitting. In Proc. of the 15th International Conference on Information Processing and Management of Uncertainty in Knowledge-Based Systems (IPMU'14), Montpellier, France, CCIS vol. 444, Springer, pages 140-149, 2014.
    • O. Pivert and G. Smits. Plethoric Answers to Fuzzy Queries: A Reduction Method Based on Query Mining. In Proc. of the 21st International Symposium on Methodologies for Intelligent Systems (ISMIS'14), Roskilde, Denmark, LNAI vol. 8502, Springer, pages 295-304, 2014.
    • H. Jaudoin, O. Pivert, G. Smits, and V. Thion. Data-Quality-Aware Skyline Queries. In Proc. of the 21st International Symposium on Methodologies for Intelligent Systems (ISMIS'14), Roskilde, Denmark, LNAI vol. 8502, Springer, pages 530-535, 2014.
    • O. Pivert, V. Thion, H. Jaudoin, and G. Smits. On a Fuzzy Algebra for Querying Graph Databases. In Proc. of the IEEE International Conference on Tools with Artificial Intelligence (ICTAI'14), Limassol, Cyprus, pages 748-755, 2014.
    • O. Pivert, V. Thion, H. Jaudoin, and G. Smits. Une algèbre floue pour l'interrogation flexible de bases de données graphes. In Actes des 30e journées Bases de Données Avancées (BDA'14), Grenoble-Autrans, France, 2014.
    • G. Smits, O. Pivert, and M.-J. Lesot. Ajustement automatique de vocabulaire expert par scission de modalité. In Actes des Rencontres Francophones sur la Logique Floue et ses Applications (LFA'14), Cargèse, France, 2014.
    • P. Nerzic, G. Smits, and O. Pivert. Un nouvel usage des prédicats flous pour l’interrogation flexible de base de données. In Actes des Rencontres Francophones sur la Logique Floue et ses Applications (LFA'14), Cargèse, France, 2014.
    • O. Pivert, G. Smits, A. Moreau, and H. Jaudoin. Réponses connexes fondées sur des associations typiques. In Actes des Rencontres Francophones sur la Logique Floue et ses Applications (LFA'14), Cargèse, France, 2014.
    • A. Essaid, A. Martin, G. Smits, & B. Ben Yaghlane, "A distance-based decision in the credal level". International Conference on Artificial Intelligence and Symbolic Computation AISC 2014, Sevilla, Spain, December 2014.
    • A. Essaid, A. Martin, G. Smits, & B. Ben Yaghlane. "Uncertainty in ontology matching: a decision rule-based approach". In IPMU, Montpellier, France, July 2014.

      • 2013
    • Grégory Smits, Olivier Pivert, Thomas Girault: ReqFlex: Fuzzy Queries for Everyone. PVLDB 6(12): 1206-1209, Riva del Garda, Italia, 2013.
    • G. Smits, O. Pivert, and T. Girault. Towards reconciling expressivity, efficiency and user-friendliness in database flexible querying. In Proc. of the 22th IEEE International Conference on Fuzzy Systems (FUZZ-IEEE'13), Hyderabad, India, 2013.
    • M.-J. Lesot, G. Smits, and O. Pivert. Adequacy of a user-defined vocabulary to the data structure. In Proc. of the 22th IEEE International Conference on Fuzzy Systems (FUZZ-IEEE'13), Hyderabad, India, 2013.
    • O. Pivert, G. Smits, and H. Jaudoin. Finding similar objects in relational databases -- An association-based fuzzy approach. In Proc. of the 10th International Conference on Flexible Query Answering Systems (FQAS'13), Granada, Spain, LNAI vol. 8132, pages 425-436, 2013.
    • G. Smits, O. Pivert, H. Jaudoin, and F. Paulus. An autocompletion mechanism for enriched keyword queries to RDF data sources. In Proc. of the 10th International Conference on Flexible Query Answering Systems (FQAS'13), Granada, Spain, LNAI vol. 8132, pages 601-612, 2013.
    • G. Smits, O. Pivert, and T. Girault. Requêtes floues et SGBD relationnels : vers un couplage renforcé. In Actes des Rencontres Francophones sur la Logique Floue et ses Applications (LFA'13), Reims, pages 77-84, 2013.
    • M.-J. Lesot, G. Smits, and O. Pivert. Mesures d'adéquation entre vocabulaire expert et structure de données. In Actes des Rencontres Francophones sur la Logique Floue et ses Applications (LFA'13), Reims, pages 243-250, 2013.
    • A. Essaid, A. Martin, G. Smits, & B. Ben Yaglhane, "Processus de Décision Crédibiliste pour l'Alignement des Ontologies", Rencontres Francophones sur la Logique Floue et ses Applications (LFA), octobre 2013, Reims, France.

      • 2012
    • O. Pivert and G. Smits. Towards an efficient processing of outranking-based preference queries. In Proc. of the 14th International Conference on Information Processing and Management of Uncertainty in Knowledge-Based Systems (IPMU'12), Catania, Italy, CCIS vol. 297, Springer, pages 471-480, 2012.
    • O. Pivert and G. Smits. On fuzzy preference queries explicitly handling satisfaction levels. In Proc. of the 14th International Conference on Information Processing and Management of Uncertainty in Knowledge-Based Systems (IPMU'12), Catania, Italy, CCIS vol. 297, Springer, pages 341-350, 2012.
    • O. Pivert and G. Smits. On a preference query language that handles symbolic scores. In Proc. of the 16th East-European Conference on Advances in Databases and Information Systems (ADBIS'12), Poznan, Poland, LNCS vol. 7503, Springer, pages 296-309, 2012.
    • G. Smits and O. Pivert. A fuzzy-summary-based approach to faceted search in relational databases. In Proc. of the 16th East-European Conference on Advances in Databases and Information Systems (ADBIS'12), Poznan, Poland, LNCS vol. 7503, Springer, pages 357-370, 2012.
    • O. Pivert, G. Smits, A Hadjali, and H. Jaudoin. LUCIFER : Un système de détection de conflits dans les requêtes flexibles. In Actes de la 12e Conférence Internationale Francophone sur l'Extraction et la Gestion des Connaissances (EGC'12), Bordeaux, France, pages 617-620, 2012.
    • O. Pivert, G. Smits, H. Jaudoin, and A. Hadjali. Détection efficace de conflits dans les requêtes floues. In Actes des Rencontres Francophones sur la Logique Floue et ses Applications (LFA'12), Compiègne, pages 97-104, 2012.
    • G. Smits, O. Pivert, and T. Girault. PostgreSQLf : un système d'interrogation floue. In Actes des 28e journées Bases de Données Avancées (BDA'12), Session démonstrations, Clermont-Ferrand, France, 2012.

      • 2011
    • P. Bosc, O. Pivert, and G. Smits. A preference query model based on a fusion of local orders. In Proc. of the 11th European Conference on Symbolic and Quantitative Approaches to Reasoning with Uncertainty (ECSQARU'11), Belfast, Northern Ireland, UK, LNAI vol. 6717, Springer, pages 725-736, 2011.
    • O. Pivert, A. Hadjali, and G. Smits. On database queries involving inferred fuzzy predicates. In Proc. of the 19th International Symposium on Methodologies for Intelligent Systems (ISMIS'11), Warsaw, Poland, LNAI vol. 6804, Springer, pages 592-601, 2011.
    • O. Pivert, A. Hadjali, and G. Smits. Searching for a compromise between satisfaction and diversity in database fuzzy querying. In Proc. of the joint 7th Conference of the European Society for Fuzzy Logic and Technology (EUSFLAT'11) and Rencontres Francophones sur la Logique Floue et ses Applications (LFA'11), Aix-Les-Bains, France, pages 402-408, 2011.
    • O. Pivert, G. Smits, and A. Hadjali. Processing fuzzy queries in a peer data management system using distributed fuzzy summaries. In Proc. of the 5th International Conference on Scalable Uncertainty Management (SUM'11), Dayton, OH, USA, LNAI vol. 6929, Springer, pages 359-372, 2011.
    • O. Pivert, G. Smits, A. Hadjali, and H. Jaudoin. Efficient detection of minimal failing subqueries in a fuzzy querying context. In Proc. of the 15th East-European Conference on Advances in Databases and Information Systems (ADBIS'11), Vienna, Austria, LNCS vol. 6909, Springer, pages 243-256, 2011.

      • 2010
    • P. Bosc, A. Hadjali, O. Pivert, and G. Smits. Trimming plethoric answers to fuzzy queries: An approach based on predicate correlation. In Proc. of the 13th International Conference on Information Processing and Management of Uncertainty in Knowledge-Based Systems (IPMU'10), Dortmund, Germany, LNCS vol. 6178, Springer, pages 595-604, 2010.
    • P. Bosc, A. Hadjali, O. Pivert, and G. Smits. On the use of fuzzy cardinalities for reducing plethoric answers to fuzzy queries. In Proc. of the 4th International Conference on Scalable Uncertainty Management (SUM'10), Toulouse, France, LNAI vol. 6379, Springer, pages 98-111, 2010.
    • P. Bosc, O. Pivert, and G. Smits. A database preference query model based on a fuzzy outranking relation. In Proc. of the 19th IEEE International Conference on Fuzzy Systems (FUZZ-IEEE'10), Barcelona, Spain, pages 38-43, 2010.
    • P. Bosc, O. Pivert, and G. Smits. A model based on outranking for database preference queries. In Proc. of the 13th International Conference on Information Processing and Management of Uncertainty in Knowledge-Based Systems (IPMU'10), Dortmund, Germany, CCIS vol. 81, Springer, pages 95-104, 2010.
    • O. Pivert, A. Hadjali, and G. Smits, Estimating the relevance of a data source using a fuzzy-cardinality-based summary, In Proc. of the 5th IEEE International Conference on Intelligent Systems (IEEE IS'10), London, Great-Britain, pages 96-101, 2010.
    • P. Bosc, A. Hadjali, O. Pivert, and G. Smits. Une approche fondée sur la corrélation entre prédicats pour le traitement des réponses pléthoriques. In Actes de la 10e Conférence Internationale Francophone sur l'Extraction et la Gestion des Connaissances (EGC'10), Hammamet, Tunisie, pages 273-284, 2010.
    • P. Bosc, A. Hadjali, O. Pivert, and G. Smits. CORTEX -- CORrelaTion-based Query EXpansion. In Actes des 25e journées Bases de Données Avancées (BDA'10), Session démonstrations, Toulouse, France, 2010.

      • 2009
    • P. Bosc, O. Pivert, and G. Smits. A flexible querying approach based on outranking and classification. In Proc. of the 8th International Conference on Flexible Query Answering Systems (FQAS'09), pages 1-12, Roskilde, Denmark, 2009.
    • G. Smits, and C. Chardenon. Controlling an SMS transcription system using heuristic and empirical criteria, In Proc. of 10th International Conference on Computing, Mexico City, Mexico, 2009.

      • 2007
    • G. Smits, and C. Chardenon. Vers une méthodologie générique de contrôle basée sur la combinaison de sources de jugement. In Actes de la 14ème conférence sur le Traitement Automatique des Langues Naturelles} (pp. 273-282), Toulouse, France, 2007.
    • O. Tardif, and G. Smits. Resolving coreference using an outranking approach. In Proc. of Recent Advances in Natural Language Processing, Borovetz, Bulgaria, 2007.

      • 2006
    • G. Smits, M. Plu, and P. Bellec. Personal semantic indexation of images using textual annotations (pp. 71-85). Springer Berlin Heidelberg, Athens, Greece, 2006.
    • G. Smits. Contrôle dynamique multicritère des résultats d’une chaîne de tal. in proceedings of RECITAL, Louvain, Belgique, 2006.
    • C. Chardenon, and G. Smits. Combining Preferences to Control a Natural Language Processing Chain. In Proceedings of Multidisciplinary ECAI'06 Workshop on Advances in Preferences Handling (pp. 128-134), Riva del Garda, Italia, 2006.
  • Reports
    • G. Smits. Personnalisation et enrichissement des méthodes d'accès aux données. Habilitation à diriger des recherches, université de Rennes 1, 2008. (manuscrit, présentation).
    • G. Smits. Une approche par surclassement pour le contrôle d'un processu d'analyse linguistique. Doctorat de l'Université de Caen, spécialité informatique, 2008. (manuscrit, présentation).
    • M. Guyomard, P. Alain, A. Hadjali, H. Jaudoin, and G. Smits. First Balance Sheeet of a Formal Approach to the Teaching of Data Structures, The B Method: from Research to Teaching , Nantes, France,2008.
    • G. Smits. Méthodologie d'Aide Multicritère à la Décision pour le Contrôle d'une Chaîne de Traitement Automatique des Langues Naturelles, Forum ROADEF: Société française de Recherche Opérationnelle et d'Aide à la Décision, Grenoble, France, 2007.
    • G. Smits. Entre analyse et décision. colloque international des doctorants et jeunes chercheurs associés du laboratoire, Université de Caen 2006.
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Teaching activities

Associate Professor at IUT Lannion (University of Rennes 1, France).
Head of the professional licence: network and system administration