Lionel TAILHARDAT

Projects

Current projects

Orange

AI4Sec, exploring how AI can enhance the security of networks and operations (2025 - ongoing).

Related on-line resources,
- DSecO, an RDF data model for DNS configuration assessment.
Knowledge Graphs at the company scale (2025 - on-going). See the “I want a KG-based Digital Twin, and that’s all I (want to) know” presentation (2024) [pres-pdf] made at the KG4DI workshop for an overview of the challenges to be addressed.

Related on-line resources,
- Ontology2Graph, generating synthetic knowledge graphs using generative AI and graph fusion, taking an RDFS/OWL ontology as input.
- PyGraft-gen, generating synthetic knowledge graphs using a stochastic approach, taking an RDFS/OWL ontology as input. Post-generation graph matching helps assess the adequacy of the knowledge graph for a specific application domain.

D2KLab

Facilitating knowledge engineering tasks with large language models (2024 - ongoing).

Related on-line resources,
- LLM4KE, a dataset of RDF data models, and code for generating competency questions.

Past projects

Orange

NORIA, synergy between knowledge graphs and machine learning for the detection of anomalies (2020 - 2024).

Related on-line resources,
- NORIA-O, an RDF data model for IT networks, events and operations information.
- Dynagraph, network dumping and Web app for live 3D graph rendering of streamed graph data derived from traces.
- Graphamelon, a Web extension that captures Web navigation traces and transforms them into a RDF graph for further exploration.
- Graphamelon-ds, an RDF dataset of Web navigation traces, generated by the Graphameleon Web extension.
- grlc, a fork of CLARIAH/grlc with SPARQL UPDATE and GitLab interface features.
- SMASSIF-RML, a Semantic Web stream processing solution with declarative data mapping capability based on a modified version of the RMLMapper-java tool and extensions to the StreamingMASSIF framework.
- ssb-consum-up, a Kafka to SPARQL gateway enabling end-to-end Semantic Web data flow architecture with a Semantic Service Bus (SSB) approach.
- SemNIDS, bringing semantics into Network Intrusion Detection Systems.
See the “NORIA: Network anomaly detection using knowledge graphs” blog post (2024) [Hello Future] for an overview of the topic.
Merging graphs and time-series techniques to predict network issues and reduce the root-cause search space (2018 - 2019).
Knowledge and process mining on network issues remediation to facilitate root-cause analysis and remediation automation (2018 - 2019).
MID-RED, automating the resilience tests of an IP-MPLS backbone (2017 - 2018).

Activities

Standardization: contributor to the W3C Knowledge Graph Construction Community Group; IETF Network Management Operations (NMOP) group; IETF NMOP Knowledge Graph Design Team.
Program organizing committee: ATLAS workshop @ ICWE’2026.
Program Chair member: Industry @ TheWebConf2023; Knowledge Graph Construction Workshop (KGCW 2023) @ ESWC 2023; Industry @ TheWebConf2024; Knowledge Graph Construction Workshop (KGCW 2024) @ ESWC 2024; Graph-based Approaches for CyberSecurity workshop (GRASEC 2024) @ ARES 2024; Resources @ ESWC 2025; Research @ ISWC 2025.
Reviewer for journals: Semantic Web journal (IOS Press SWJ); Transactions on Software Engineering (IEEE TS); Future Generation Computer Systems (Elsevier FGCS).