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Title: A text mining approach for Arabic question answering systems
Author: Sadek, J.
ISNI:       0000 0004 5357 8025
Awarding Body: University of Salford
Current Institution: University of Salford
Date of Award: 2014
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As most of the electronic information available nowadays on the web is stored as text, developing Question Answering systems (QAS) has been the focus of many individual researchers and organizations. Relatively, few studies have been produced for extracting answers to “why” and “how to” questions. One reason for this negligence is that when going beyond sentence boundaries, deriving text structure is a very time-consuming and complex process. This thesis explores a new strategy for dealing with the exponentially large space issue associated with the text derivation task. To our knowledge, to date there are no systems that have attempted to addressing such type of questions for the Arabic language. We have proposed two analytical models; the first one is the Pattern Recognizer which employs a set of approximately 900 linguistic patterns targeting relationships that hold within sentences. This model is enhanced with three independent algorithms to discover the causal/explanatory role indicated by the justification particles. The second model is the Text Parser which is approaching text from a discourse perspective in the framework of Rhetorical Structure Theory (RST). This model is meant to break away from the sentence limit. The Text Parser model is built on top of the output produced by the Pattern Recognizer and incorporates a set of heuristics scores to produce the most suitable structure representing the whole text. The two models are combined together in a way to allow for the development of an Arabic QAS to deal with “why” and “how to” questions. The Pattern Recognizer model achieved an overall recall of 81% and a precision of 78%. On the other hand, our question answering system was able to find the correct answer for 68% of the test questions. Our results reveal that the justification particles play a key role in indicating intrasentential relations.
Supervisor: Not available Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available