1. 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

2. 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 ,
Providing Intelligent Content - Pinar SENKUL - METU CENG

3. 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 ANSI Z39
used for ; more generic / more specific ; is-related to => disambiguate them
Add terms / labels
16/01/2019
Ontologies, text and IR ,
Providing Intelligent Content - Pinar SENKUL - METU CENG

4. 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 ,
Providing Intelligent Content - Pinar SENKUL - METU CENG

5. 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 ,
Providing Intelligent Content - Pinar SENKUL - METU CENG

6. 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 ,
Providing Intelligent Content - Pinar SENKUL - METU CENG

7. 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 ,
Providing Intelligent Content - Pinar SENKUL - METU CENG

8. 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 ,
Providing Intelligent Content - Pinar SENKUL - METU CENG

9. Providing Intelligent Content - Pinar SENKUL - METU CENG
More
16/01/2019
Ontologies, text and IR ,
Providing Intelligent Content - Pinar SENKUL - METU CENG