The Semi-automatic expansion of existing terminological ontologies using knowledge patterns discovered on the WWW


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The Semi-automatic expansion of existing terminological ontologies using knowledge patterns discovered on the WWW

Vis færre oplysninger Halskov, Jakob en_US 2009-02-04T10:28:30Z 2009-02-04T10:28:30Z 2008-10-08T00:00:00Z en_US
dc.description.abstract The research object of this thesis is the so-called knowledge patterns and their usefulness in automatically extracting specic semantic relations from unannotated and uncategorized text on the WWW so as to facilitate semi-automatic updating and extension of existing ontological and terminological resources. The main contribution of the thesis is the implementation of a com- plete ontology extension framework called WWW2REL which is 100% based on a knowledge-poor, domain-independent processing of WWW text snippets and includes the three stages of pattern discovery, pattern ltering and relation instance ranking. Unlike most comparable systems WWW2REL is special in that it is both highly portable, can be applied to any semantic relation type and operates directly on uncategorized WWW text snippets. The system is tested on the biomedical UMLS Metathesaurus for four dierent relation types and manually evaluated by four domain experts. It is demonstrated that high precision in the task of knowledge discovery from a noisy text source can be achieved using a very simple instance relevance measure and two ranking heuristics. In contrast, many comparable systems operate on richly annotated academic text and tend to apply heuristics which are custom-tailored to a specic domain and/or relation type. When selecting the overall best ranking scheme, average system performance across all four relation types ranges between 70% to 65% of the maximum possible F-score by top 10 and top 50 relation instances, respectively. Finally, the thesis experiments also examine the portability of individ- ual knowledge patterns and of the ranking heuristics. It is concluded that synonymy KPs are the most domain independent closely followed by ISA KPs, whereas patterns for "may_prevent" and especially "induces" are more dependent on the domain. Empirical experiments also suggest that a ranking heuristic which penalizes relation instances whose arguments occur frequently in a general language corpus can be highly eective, but may need to be adapted to the domain in question. en_US
dc.format.extent 292 en_US
dc.language eng en_US
dc.relation.ispartofseries Ph.d.serie; en_US
dc.subject.other ph.d.-afhandlinger en_US
dc.title The Semi-automatic expansion of existing terminological ontologies using knowledge patterns discovered on the WWW en_US
dc.type phd en_US
dc.accessionstatus modt08okt08 ligamo en_US
dc.contributor.corporation Copenhagen Business School. CBS en_US
dc.contributor.department Institut for Interkulturel Kommunikation og Ledelse en_US
dc.contributor.departmentshort IKL en_US
dc.contributor.departmentuk Department of Intercultural Communication and Management en_US
dc.contributor.departmentukshort IKL en_US
dc.idnumber x65655477x en_US København en_US
dc.publisher.year 2008 en_US
dc.title.subtitle An implementation and evaluation en_US

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