Ontology and knowledge graphs

Ontologies, SPARQL, knowledge-graph construction and graph learning.

Related work

• ADS safety-testing ontology Key workOWL ontology that structures safety-testing knowledge for automated driving systems.
• Semantic extraction pipeline Key workPipeline that extracts semantic facts for ADS safety testing, validated with SPARQL and run as PBS jobs.
• ask.chaipat.cc, the ask-me-anything site Key work Nov 2026This site: a portfolio for finding entities and their live sites, about pages and source code, as well as asking questions about his work. A Turtle knowledge graph supplies facts to a browser SPARQL engine and a shared resource catalog, next to a wiki with full-text search, a timeline and a graph view of the graph and its ontology.
• Knowledge-graph explorer Key work Apr 2026Graph Laboratory: a research workspace for exploring large system-of-systems datasets as force-directed graphs, built with Next.js, Postgres and Redis.
• Knowledge graph construction from unstructured data Key work Feb 2025Pipeline that builds knowledge graphs from unstructured text: entity and relation extraction with spaCy, graph construction with NetworkX, export to edge lists, adjacency matrices and GraphML.
• Ontology-augmented health recommendation Key work Mar 2026Ontology-augmented personal healthcare service recommendation for Thailand: an OWL 2 DL ontology of diseases, symptoms, services, facilities, locations and insurance, queried with SPARQL and reasoned over with SWRL rules. Built for an ontology-engineering course, with a full written report.
• Claim Conflict Finder Oct 2026Agent skill that shows where research papers disagree and whether datasets, populations or methods explain it.
• Ontology & SPARQL cheat sheets Mar 2026Two-page Thai cheat sheets for ontology design (Protégé) and SPARQL 1.1, with practical examples.
• Graph classification experiments Feb 2025Graph-classification experiments on the MUTAG and PROTEINS datasets with PyTorch Geometric.

@prefix id: <https://ask.chaipat.cc/id/> .
@prefix rdf: <http://www.w3.org/1999/02/22-rdf-syntax-ns#> .
@prefix cj: <https://ask.chaipat.cc/ns#> .
@prefix rdfs: <http://www.w3.org/2000/01/rdf-schema#> .

id:ThemeOntology
    a cj:Theme ;
    rdfs:label "Ontology and knowledge graphs" ;
    cj:description "Ontologies, SPARQL, knowledge-graph construction and graph learning." .