This page relates to my current PhD research relating
to semantic heterogeneity,
information search and integration - in the context of the Semantic
Web and Ontology. It
will generate ontology examples using XML-based RDF, RDF Schema
and OWL, together with other relevant technologies.
The main areas of consideration will involve:
- An examination of ontology
mapping issues at both Upper (foundational) and Domain/Context levels.
- Consideration of modularity within the context
of small "geographical" OWL ontologies.
- Formulation of theory regarding module reuse and the
identification of primary and secondary contexts. The issues of
effectiveness and efficiency in ontology design will be considered,
with particular relevance to minimising ontology specification redundancy.
- Consideration of how such contexts can be best applied
in a motivating application ontology.
- A Jena-based java applet has been developed to allow:
- OWL Ontology query.
- Ontology search using a web-crawler
process.
- Selective dynamic importation of the results of ontology
searches into OWL ontology.
- The java applet has been further developed as a semantic search tool for ontology-based
query expansion (OQE).
- Searches have been analysed
using a test
data population of 100 Web pages. More extensive search experiments is being conducted using the TREC WT2g document corpus.
- OQE experiments have now been completed on a
¼ million Web documents for three of the TREC query topics (T401, 416 and 438). Document relevance rankings have been calulated using a document term weighting algorithm and search effectiveness compared, based on precision and recall measures.
- The OQE-based search results have been compared against conventional keyword results,
generated by the search tool, to determine search effectiveness of OQE search against keyword-driven search.
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Presentations, Papers and Posters
- "Information Dynamics, Perspectives, and Risks", February
2005, pdf.
- "Data Modelling for Data Integration", research
topics presentation, March 2005, ppt.
- "Understanding Structural and Semantic Heterogeneity
in the Context of Database Schema Integration", In Proceedings
of the SIXTH Conference in the Dept. of Computing, (Journal of the
Dept. of Computing, UCLan, Issue
Number 4, pp. 29-44, ISSN 1476-9069), May 2005, pdf.
[citation][citation][citation][citation]
- "Schema and Semantic Heterogeneity in Database Schema
Integration",
presentation, SIXTH Conference of Dept. of Computing, UCLAN, May
2005, ppt.
- "Developing "Geo" Ontology Layers for Web Query",
presentation to Graduate School Conference, UCLan, December 2005,
ppt.
- "Semantic Web, Ontology Integration, and Web Query",
presentation at Dept. of Computing Seminar, UCLan, March 2006,
pps.
- "Developing Ontologies based on RDF-OWL Semantic Web
languages", presentation to Graduate School How-to@2, UCLan, April
2006,
pps.
- "CO3709 Research Topics in Computing 2007", presentation,
BSc Research Topics, UCLan, 6 March 2007, ppt.
- "MSc Database Systems Research Topics", presentation, MSc
Database Systems, UCLan, 23 March 2007, ppt.
- "Ontology Modules by Layering - Facilitating Reuse in a Geographical
Semantic Web Context", presentation SEVENTH Conference of Dept.
of Computing, UCLan, 20 June 2007, ppt.
- "Geographical Ontology Modules for Efficient Semantic Web Reuse",
presentation, Ordnance Survey Research Labs, Southampton, 28 June
2007, ppt.
- "The Semantic Web and Efficient Reuse of Ontology Modules",
presentation, MSc CO3701 Advanced Database Systems Research Topics,
UCLan, 5 March
2008.
- "An Ontology-based Semantic Web Search Engine to improve Precision
and Recall", poster presented at Faculty of Science and Technology
Annual Research Conference, UCLan, 18 June 2008.
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