Olfa Slama

I received a Ph.D degree in Computer Science from the University of Rennes 1 (France) in November 2017. I am currently a Temporary Research and Teaching Assistant (ATER) at ENSSAT Lannion (University of Rennes 1, France) and a member of the SHAMAN team in IRISA (Institute for Research in IT and Random Systems) labs. My main research activities during my Ph.D concern a flexible querying of fuzzy graph databases. This year, I am focusing on the subject of quality data management of heteregeneous graph data. See my CV

Research interests

Information retrieval, fuzzy querying, preference queries, fuzzy database summaries, data quality management, semantic web, (RDF) graph database.

DEGREES

[2014 - 2017] - PhD. in Computer Science - University of Rennes 1 (ENSSAT Lannion), France

PhD Subject Title: Flexible Querying of RDF Databases: A Contribution Based on Fuzzy Logic.
Supervisors: Olivier Pivert (Prof., Univ. Rennes 1) and Virginie Thion (Associate Prof., Univ. Rennes 1).
Laboratory: IRISA (University of Rennes 1), Data and Knowledge Management Department, Team SHAMAN.
Project: Open Data INtelligence (Project granted by DGA RAPID, 2014-2018).
This thesis concerns the definition of a flexible approach for querying both crisp and fuzzy RDF data graphs. This approach, based on the theory of fuzzy sets, makes it possible to extend SPARQL which is the W3C-standardised query language for RDF, so as to be able to express i) fuzzy user preferences on data (e.g., the release year of an album is recent) and on the structure of the data graph (e.g., the path between two friends is required to be short) and ii) more complex user preferences, namely, fuzzy quantified statements (e.g., most of the albums that are recommended by an artist, are highly rated and have been created by a young friend of this artist). We performed some experiments in order to study the performances of this approach. The main objective of these experiments was to show that the extra cost due to the introduction of fuzziness remains limited/acceptable. We also investigated, in a more general framework, namely graph databases, the issue of integrating the same type of fuzzy quantified statements in a fuzzy extension of Cypher which is a declarative language for querying (crisp) graph databases. Some experimental results are reported and show that the extra cost induced by the fuzzy quantified nature of the queries also remains very limited. see developed softwares
Keywords: fuzzy set theory, fuzzy quantified statements, RDF graph, flexible querying, graph databases.

[2012 - 2014] - MSc. Science and Technology of Business Intelligence - High Institute of Management of Tunis (ISGT), Tunisia

Dissertation titled: About alpha-cuts in bipolar and multipolar queries in relational databases. for more details
Supervisors: Jalel Akaichi (Prof., Univ. Tunis), Ludovic Liétard (Associate Prof.(HDR), Univ. Rennes 1) and Daniel Rocacher (Prof., Univ. Rennes 1).
Laboratory: IRISA (University of Rennes 1), Data and Knowledge Management Department, Team SHAMAN
Funding: alternate scholarship from the Ministry of Higher Education, Scientific Research and Technology of Tunisia.

[2009 - 2012] - BSc. Computer Management - High Institute of Management of Tunis (ISGT), Tunisia

Subject: Design and development of a secure web application for the management and monitoring of credit files using Java Enterprise Edition.
Company: BIAT Tunis, International Arabic Bank of Tunisia

[2008 - 2009] - Bachelor of Science. Mathematics field - High School of Tunisia

PROFESSIONAL EXPERIENCE

[Since Sept. 2017] - Contract teacher (full time) - ENSSAT Lannion (University of Rennes 1), France

[Sept. 2015 - August. 2017] - Teaching assistant - ENSSAT Lannion (University of Rennes 1), France

[2014 - 2017] - Doctoral researcher - IRISA (University of Rennes 1), Data and Knowledge Management Department, Team SHAMAN

[Apr. 2014 - Jun. 2014] - Research intern - IRISA (University of Rennes 1), Data and Knowledge Management Department, Team SHAMAN

[Sept. 2013 - Dec. 2013] - Temporary teacher - High Institute of Management of Tunis (ISGT), Tunisia

[Feb. 2012 - May. 2012] - Graduate trainee - BIAT Tunis, International Arabic Bank of Tunisia

TEACHING ACTIVITIES

[Sept. 2017] - [Aug. 2018] - ATER (Temporary Research and Teaching Assistant) - Engineering School of Applied Science and Technology. (ENSSAT), France - (192h/Year)

  • Algorithmics & C programming language - TP & TD/L3 level (common core) .
  • PHP programming language - TP/M1 level(computer science).
  • XML DB (Schema XML, XQuery, XSLT, XPATH) - TP/M1 level(computer science).
  • PHP 5 (object-oriented programming) - TP/L3 level (IMR - apprenticeship).
  • Data Structures - TP/L3 level(electronics & computer science).
  • Cyber Security Systems and Networks - TP/M2 level (IMR & computer science).
  • Operating system (UNIX) - TP/L3 level(common core).
  • Object Programming (Java) - lecture & TP/M1 level (computer science).
  • Client/server Web programming - TP/M1 level (computer science).

[Sept. 2016] - [Aug. 2017] - Teaching assistant - Engineering School of Applied Science and Technology. (ENSSAT), France - (64h/Year)

  • Algorithmics & C programming language - TP & TD/L3 level (common core) .
  • PHP programming language - TP/M1 level (computer science).
  • PHP 5 (object-oriented programming) - TP/L3 level (IMR - apprenticeship).
  • Data Structures -TP/L3 level (electronics).

[Sept. 2015] - [Aug. 2016] - Teaching assistant - Engineering School of Applied Science and Technology (ENSSAT), France - (64h/Year)

  • Algorithmics & C programming language - TP & TD/L3 level (common core).
  • Relational Databases "MySQL" - TP/L3 level (computer science).

[Sept. 2013] - [Dec. 2013] - Contractual teacher - High Institute of Management of Tunis (ISGT) - Tunisia - (32h/Year)

  • Service Oriented Architecture - TP/L3 level (computer science).

PUBLICATIONS*

* The order of the authors in the paper is alphabetically sorted and is not based on the importance of contributions.

International Review

O. Pivert, O. Slama, and V. Thion. Expression and efficient evaluation of fuzzy quantified structural queries to fuzzy graph databases, Fuzzy Sets and Systems, 2018.

International Conferences

O. Pivert, O. Slama, and V. Thion. Fuzzy Quantified Queries to Fuzzy RDF Databases. In Proc. of the 26th IEEE International Conference on Fuzzy Systems (Fuzz-IEEE'17), Naples, Italy, 2017. canard
O. Pivert, O. Slama, and V. Thion. Fuzzy Quantified Structural Queries to Fuzzy Graph Databases. In Proc. of the 10th International Conference on Scalable Uncertainty Management (SUM'16), Nice, France, 2016. canard
O. Pivert, O. Slama, and V. Thion. An Extension of SPARQL with Fuzzy Navigational Capabilities for Querying Fuzzy RDF Data. In Proc. of the 25th IEEE International Conference on Fuzzy Systems (Fuzz-IEEE'16), Vancouver, Canada, 2016. canard
O. Pivert, O. Slama, G. Smits, and V. Thion. A Fuzzy Extension of SPARQL for Querying Gradual RDF Data. In Proc. of the 10th IEEE International Conference on Research Challenges in Information Science (RCIS'16), poster session, Grenoble, France, 2016. canard see poster
O. Pivert, O. Slama, G. Smits, and V. Thion. SUGAR: A Graph Database Fuzzy Querying System. In Proc. of the 10th IEEE International Conference on Research Challenges in Information Science (RCIS'16), demo session, Grenoble, France, 2016. canard see poster
O. Pivert, O. Slama, and V. Thion. SPARQL Extensions with Preferences: a Survey. In Proc. of the 31st ACM Symposium on Applied Computing (SAC'16), Pisa, Italy, 2016. canard
J. Akaichi, L. Lietard, D. Rocacher, O. Slama: On the Qualitative Calibration of Bipolar Queries. In Proc. of the 22nd International Symposium on Methodologies for Intelligent Systems (ISMIS'15), Lyon, France, 2015. canard

French Conferences

O. Pivert, O. Slama, and V. Thion. FURQL : une extension floue du langage SPARQL. In Actes des 32èmes Journées Bases de Données Avancées (BDA'16), Poitiers, France, 2016.
O. Pivert, O. Slama, and V. Thion. Requêtes quantifiées floues structurelles sur des bases de données graphe. In Actes des 25èmes Rencontres Francophones sur la Logique Floue et ses Applications (LFA'16), La Rochelle, France, 2016.

Reports

O. Slama. Flexible Querying of RDF Databases: A Contribution Based on Fuzzy Logic. Doctoral thesis, University of Rennes 1, 2017.
O. Slama. About alpha-cuts in bipolar and multipolar queries in relational databases. Master thesis, University of Tunis, 2014.

RESEARCH ACTIVITIES

  • I attended some international conferences (IWBBIO’13 in Granada, SUM'16 in Nice, SAC'16 in Pisa, RCIS'16 in Grenoble, FUZZ-IEEE'16 in Vancouver and FUZZ-IEEE'17 in Naples) and french ones (BDA'16 in Poitiers, LFA'16 in La Rochelle and Inforsid'18 in Nantes).
  • I participated to the EDBT'15 summer school about "Graph Data Management" in Palamos (Spain) and the MLSS’13 Summer School about “Machine Learning on Big Data” in Hammamet (TUNISIA).
  • I participated to ENSSAT Open House Days (2016, 2017, 2018) - presenting my research work in a vulgarized way to an audience of non-specialists (high school students, citizens, ...).

DEVELOPED SOFTWARE

I participated in the development of the following software during my thesis which are available and downloadable at this adress

  • SUGAR, based on Neo4j, concerns a fuzzy extension of Cypher language allowing a flexible querying of fuzzy graphs databases.
  • SURF, built on top of a classical SPARQL engine, is based on an extension of SPARQL and aims to query fuzzy RDF databases in a flexible way.

CONTACT

  • Address

    Mss. Olfa Slama
    Site 3 - Office 223J
    6 Rue de Kerampont CS 80518 22305 Lannion Cedex FRANCE
  • Phone

    02 96 46 90 86
  • Email