Géraud FOKOU
Géraud FOKOU
PhD

email: geraud.fokou@ensma.fr
school: ISAE - ENSMA
address: ISAE-ENSMA, 1 avenue Clément Ader BP 40109, 86961 Chasseneuil - France
team: Data Engineering
Lecture Activity
Since october 2014, i have recruited in ISAE-ENSMA teacher staff as PhD with teaching complementary activities. I make my complementary activity of teaching as a programming trainer of first year engineer student (common formation). I teach them programming in ADA language and the mains concepts which have learned, are:
  • body of a ADA program (example),
  • data's type in ADA,
  • data object in ADA,
  • functions, procedures, package and modules in ADA,
  • using of graphical package in ADA : JEWL.
We use the ADAGide development environment for editing programs, with a gradual learning process, from the implementation of simple data structure to the conception of user's package and system's modules for a given complex system. As example of system asks to our students to implement, we have the Mastermind simulator or other social game simulator.
Research Activity
Context
My research work is about cooperation between user and data management system. The recent generation of data models as knowledge base, graph data, ontology and semantic data has the capability to update data but not only, they can upgrade data’s structure or model. Then, as this capability is an advantage for flexibility of the data management, it can be a disadvantage for querying since it make queries obsoletes and increase the probability for a query to return an empty answers set.
My work wants to propose a solution for query with empty answers set in semantic data environment. First, we will propose a relaxation process and operators which will include the finding of real causes of failing and uses graph approximation for relaxing semantic queries, particularly SPARQL query. Second, we will personalize the relaxation process for a particular user. For making this, we will model the profile of users which will contain all the preferences of these users. With that profile, will be able to compute the distance between queries and profile in one hand and in others hand we will compute distance between relaxed answers and profile. All these process, concepts, techniques will be implement in a framework for allowing all persons to describe its own relaxation process with its own measures, own operators. This framework allows users to personalize relaxation process and make its conception easy.

Application
The main applications of my research work are in semantic web as E-commerce and social network. And also in a company, the relaxation process can be use suggesting answers to a user and reduce the interaction with the data management system. This reduction of interaction, allows user to increase its productivity.
Publications
(14)
International Journals
(1)
Géraud FOKOU, Stéphane JEAN, Allel HADJALI, Mickael BARON, Handling Failing RDF Queries: From Diagnosis to Relaxation, Knowledge and Information Systems (KAIS 2016), March, 2016, pp. 167-19521368/KAIS2015.pdf
International Conferences
(6)
Géraud FOKOU, Stéphane JEAN, Allel HADJALI, Mickael BARON, RDF Query Relaxation Strategies Based on Failure Causes (Best Research Paper Award), 13th International Extented Semantic Web Conference, Heraklion, Greece (ESWC16), 2016, pp. 439-45421268/ESWC2016_FOKOU_ET_AL_CAMERA_READY.pdf
Géraud FOKOU, Stéphane JEAN, Allel HADJALI, Mickael BARON, QaRS: A User-Friendly Graphical Tool for Semantic Query Design and Relaxation (Demo Paper) , 18th International Conference on Extending Database Technology, Brussels, Belgium (EDBT 2015), 2015, pp. 553-556
Géraud FOKOU, Stéphane JEAN, Allel HADJALI, Mickael BARON, Cooperative Techniques for SPARQL Query Relaxation in RDF Databases, 12th Internationa Extended Semantic Web Conference, Portoroz, Slovenia (ESWC15), 2015, pp. 237-25218000/ESWC2015.pdf
Géraud FOKOU, Stéphane JEAN, Allel HADJALI, Endowing Semantic Query Languages with Advanced Relaxation Capabilities, 21st International Symposium on Methodologies for Intelligent Systems (ISMIS 2014), 2014
Stéphane JEAN, Ladjel BELLATRECHE, Carlos Ordonez, Géraud FOKOU, Mickael BARON, OntoDBench: Interactively Benchmarking Ontology Storage in a Database (Demo paper), 32nd International Conference on Conceptual Modeling (ER 2013), 201311861/er2013.pdf
Stéphane JEAN, Ladjel BELLATRECHE, Géraud FOKOU, Mickael BARON, Selma KHOURI, OntoDBench : Novel Benchmarking System for Ontology-Based Databases, Ontologies, DataBases, and Applications of Semantics (ODBASE 2012), 2012, pp. 897-9149908/JEAN_ODBASE2012.pdf
National Conferences
(4)
Géraud FOKOU, Stéphane JEAN, Allel HADJALI, Mickael BARON, RDF Query Relaxation Strategies Based on Failure Causes, 32th French Conference On Advanced Databases (BDA 2016), 2016
Géraud FOKOU, Stéphane JEAN, Allel HADJALI, Mickael BARON, Cooperative Techniques for SPARQL Query Relaxation in RDF Databases, the 31st French Conference on Advanced Databases (BDA 2015), 2015
Géraud FOKOU, Un Framework pour la relaxation des requêtes dans les bases de données du Web Sémantique, Actes 7ème Forum Jeunes Chercheurs, INFORSID (FJC-INFORSID 2014), 2014, pp. 415272/fjc2014actes.pdf
Stéphane JEAN, Ladjel BELLATRECHE, Géraud FOKOU, Mickael BARON, Selma KHOURI, OntoDBench: Ontology-based Database Benchmark, 28e journées Bases de Données Avancées (BDA 2012), Clermont Ferrand, 20129930/cr.pdf
Thesis and HDR
(1)
Géraud FOKOU, Conception d'un Framework pour la relaxation des requêtes SPARQL, Thesis, Ecole Nationale Supérieure de Mécanique et d'Aérotechnique (ISAE-ENSMA), Téléport 2, 1 Avenue Clément Ader, 86360 Chasseneuil-du-Poitou - France, november, 201623860/These-Geraud.pdf
Research Reports
(2)
Géraud FOKOU, Stéphane JEAN, Allel HADJALI, Mickael BARON, Cooperative Techniques for SPARQL Query Relaxation in RDF Databases, (2.0)16873/Report_MFS_XSS.pdf
Géraud FOKOU, Stéphane JEAN, Allel HADJALI, Endowing Semantic Query Languages with Advanced Relaxation Capabilities, (1.0)14619/Rapport.pdf