Συντάχθηκε 23-04-2013 13:51
από Eleni Stamataki
Email συντάκτη: estamataki<στο>tuc.gr
Ενημερώθηκε:
-
Ιδιότητα: σύνταξη/αποχώρηση υπάλληλος.
ΠΟΛΥΤΕΧΝΕΙΟ ΚΡΗΤΗΣ
Τμήμα Ηλεκτρονικών Μηχανικών & Μηχανικών Υπολογιστών
ΠΑΡΟΥΣΙΑΣΗ ΜΕΤΑΠΤΥΧΙΑΚΗΣ ΔΙΑΤΡΙΒΗΣ
ΣΤΡΑΒΟΣΚΟΥΦΟΥ ΚΩΝ/ΝΟΥ
με θέμα
“ SOWL QL : Qurying spatio-temporal ontologies in OWL 2.0”
Τετάρτη 24 Απριλίου 2013, 12:00μμ
Αίθουσα 141.A14,
Κτίριο Επιστημών, Πολυτεχνειούπολη
Εξεταστική Επιτροπή
Καθ. Πετράκης Ευριπίδης (επιβλέπων)
Καθ. Χριστοδουλάκης Σταύρος
Αν.Καθ. Λαγουδάκης Μιχαήλ
Περίληψη
Querying spatio-temporal information in ontologies using query languages such as SPARQL leads to complicated queries and requires that the users be familiar with the underlying representation of spatio-temporal information. Adding spatial and temporal operators that hide the underlying representation from the end user while maintaining simplicity of expression in queries is an important issue to deal with.
We introduce SOWL-QL, a high-level query language for querying spatio-temporal information in OWL ontologies. SOWL-QL extends SPARQL with a powerful set of temporal and spatial operators, including Allen operators, and is capable of querying both quantitative and qualitative temporal and spatial information (e.g., information expressed using dates, times, temporal intervals or information expressed using
natural language terms such as “before” or “after”). SOWL-QL is part of SOWL, an approach for handling spatio-temporal information comprising of an ontology in OWL, the SOWL QL query language and a reasoner.
Representation of dynamic concepts in SOWL is achieved using the “N-ary relations” or, alternatively, the “4D-fluents” mechanism. Both the 4D-fluents and N-ary mechanisms are thoroughly explored and expanded for representing qualitative (in addition to quantitative) spatio-temporal information in OWL. A spatial model
representation has also been implemented in SOWL supporting the representation of both directional and topological relations. Moreover, SOWL offers reasoning support with a reasoner integrated within the ontology. Temporal and spatial reasoning in SOWL is realized by introducing a set of SWRL rules operating on spatial
(topological or directional) relations as well as on temporal Allen relations. As a proof of concept, SOWL QL is implemented in full along with a Graphical User Interface (GUI) facilitating ontology loading and parsing, query formulation and execution and, results viewing.
