Build ontologies from texts and using them for IR Josiane MOTHE Institut de Recherche en Informatique de Toulouse (IRIT) 16/01/2019 Providing Intelligent Content - Pinar SENKUL - METU CENG

Providing Intelligent Content - Pinar SENKUL - METU CENG Ontology Ontology: description at a conceptual level Concepts and their labels Semantic relationships Rules (inferences) Domain ontology In order to help Structuration Access (direct or advanced information) to heterogeneous data Issues Build ontologies Use them in applications 16/01/2019 Ontologies, text and IR , mothe@irit.fr Providing Intelligent Content - Pinar SENKUL - METU CENG

Providing Intelligent Content - Pinar SENKUL - METU CENG Building ontologies From texts Term extraction Relationship extraction (NLP-based) Formalisation : OWL-Lite [w3c] Enrich thesaurus when exist ISO 2788 - ANSI Z39 used for ; more generic / more specific ; is-related to => disambiguate them Add terms / labels 16/01/2019 Ontologies, text and IR , mothe@irit.fr Providing Intelligent Content - Pinar SENKUL - METU CENG

Building ontologies – from thesaurus Concepts and labels from terms Term1 USE Term2 Term3 USED FOR Term2 IS a relation Term1 Broader Term Term2 Term3 Narrower Term Term4 Hierachical levels Concept INTRINSIC COLORS Label intrinsic color   Concept ULTRAVIOLET COLORS Label ultraviolet color head Color Intrinsic color Ultraviolet existing concept in the hierarchy 16/01/2019 Ontologies, text and IR , mothe@irit.fr Providing Intelligent Content - Pinar SENKUL - METU CENG

Building ontologies – from corpus Abstract level Syntatic analysis Terms and their category Context of usage Extraction of terms and the semantic of their relationships « is a property of » between « radial velocity » and « intensity » 16/01/2019 Ontologies, text and IR , mothe@irit.fr Providing Intelligent Content - Pinar SENKUL - METU CENG

Providing Intelligent Content - Pinar SENKUL - METU CENG Using ontologies in IR Visualization of the instances of the task ontology 16/01/2019 Ontologies, text and IR , mothe@irit.fr Providing Intelligent Content - Pinar SENKUL - METU CENG

Providing Intelligent Content - Pinar SENKUL - METU CENG Using ontologies in IR Visualization of the knowledge learnt for an instance researcher of the task ontology 16/01/2019 Ontologies, text and IR , mothe@irit.fr Providing Intelligent Content - Pinar SENKUL - METU CENG

Providing Intelligent Content - Pinar SENKUL - METU CENG Using ontologies in IR Visualization of the knowledge learnt for an instance Article of the task ontology 16/01/2019 Ontologies, text and IR , mothe@irit.fr Providing Intelligent Content - Pinar SENKUL - METU CENG

Providing Intelligent Content - Pinar SENKUL - METU CENG More www.irit.fr/~Josiane.Mothe mothe@irit.fr 16/01/2019 Ontologies, text and IR , mothe@irit.fr Providing Intelligent Content - Pinar SENKUL - METU CENG