heraclitus: a framework for semantic web adaptation
DESCRIPTION
The Heraclitus framework proposes the adaptation of the Semantic Web, based on web usage data.TRANSCRIPT
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Heraclitus: Web Usage Driven Adaptation of the Semantic Web
Alexander MikroyannidisBabis Theodoulidis
School of InformaticsUniversity of Manchester
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Introduction
The Semantic Web has emerged as a solution to the problem of organizing the immense information provided by the World Wide Web. However, a static Semantic Web can be of little use in the environment of the ever-transforming World Wide Web. The answer: Adaptation of the Semantic Web to the users’ needs and preferences.
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Web Site Ontology (I)
It is strongly related to the site topology.It is comprised of the thematic categories covered by the site’s pages. These categories are the concepts of the ontology.The concepts are organized in a hierarchy, representing an “is a” relationship.The concepts are instantiated in the web pages.
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Web Site Ontology (II)
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Framework Principles
Web TransformationEnhancement of usability for all visitors, including
new onesTransparency
Tactical vs. Strategic adaptations (Coenen et al 2000)Emphasis on the role of the webmasterLearning adaptation engine
Adaptation of the physical and semantic structure: site ontology evolution
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Architecture Overview
Topology & Ontology Evolution
Pagesets Classification
Session Mining
Preprocessing
PagesetsPagesets: : Sets of pages Sets of pages that are that are frequently frequently accessed accessed together together throughout throughout the same the same sessionsession
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Preprocessing
Session identification approaches:TopologyContentTemporal information
Data Cleaning
Access Logs
Removal of:
Session Identification
Sessions
Accesses to multimedia
content Robot accesses
Erroneous accesses
Cleaned Access Logs
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Session Mining
Market Basket AnalysisIncorporation of physical and semantic information: Web page
location Web page
classification
SessionsPagesets
GenerationPagesets
Web Site Topology
Web Site Ontology
Session Mining
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Topology & Ontology Evolution
Pagesets
Linkage State
Classification
Content Classification
Web Site Topology
Web Site Ontology
Classified Pagesets
Refined Web Site Topology
Refined Web Site Ontology
Proposals Review
Report Generation
Report
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Case Study
University of Manchester School of Informatics web site (www.informatics.manchester.ac.uk)2,500 web pagesApproximately 4,000 hits/day80% of the traffic is generated by undergraduate or postgraduate students
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Web Site Topology Evolution (I)
Insertion of new shortcut links
Highlighting of popular existing links
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Web Site Topology Evolution (II)
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Web Site Ontology Evolution (I)New associations between conceptse.g.: Research and Programmes conceptsReorganization of concepts’ hierarchy. Creation of new categories, changes in others e.g.: Transfer of Staff concept to the highest level of the ontology New categorization of web pages. Identification of multiple instances of concepts or multiple subconceptse.g.: Job Vacancies page: categorized under Staff and Research
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Web Site Ontology Evolution (II)
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Conclusions
A web usage driven approach on the adaptation of the Semantic Web was introduced. The proposed framework targets both the physical and semantic aspects of the web.An architecture implementing the theoretical principles of the framework was proposed.Successful application of proposed methodology on a real web site.
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Future Work
Automatic construction of the site ontology (e.g. agglomerative hierarchical clustering techniques) Meta-analysis of users’ access patternsSimultaneous adaptation of multiple web sites towards the development of the Adaptive Semantic Web
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Thanks!
To try out Heraclitus visit:
http://heraclitus.sourceforge.net