Eksairesis: A Domain-Adaptable System for Ontology Building from Unstructured Text

This paper describes Eksairesis, a system for learning economic domain knowledge automatically from Modern Greek text. The knowledge is in the form of economic terms and the semantic relations that govern them. The entire process in based on the use of minimal language-dependent tools, no external linguistic resources, and merely free, unstructured text. The methodology is thereby easily portable to other domains and other languages. The text is pre-processed with basic morphological annotation, and semantic (named and other) entities are identified using supervised learning techniques. Statistical filtering, i.e. corpora comparison is used to extract domain terms and supervised learning is again employed to detect the semantic relations between pairs of terms. Advanced classification schemata, ensemble learning, and one-sided sampling, are experimented with in order to deal with the noise in the data, which is unavoidable due to the low pre-processing level and the lack of sophistica...

• Type: Conference
• Year: 2008
• Where: LREC
• Authors: Katia Kermanidis, Aristomenis Thanopoulos, Manolis Maragoudakis, Nikos Fakotakis
• Keywords: Education, LREC 2008, Semantic Relations, Supervised Learning, Supervised Learning Techniques