2008 Working Papers

Recent Submissions

Now showing 1 - 5 of 14
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    Design and formal model of an event-driven and service-oriented architecture for the Mobile Tourist Information System TIP
    (Working Paper, Department of Computer Science, University of Waikato, 2008) Eschner, Lisa; Hinze, Annika
    This thesis introduces a new collaboration framework for context-aware services in a mobile environment enabling services to co-operate with several anonymous co-operation partners. We extend the current TIP design and architecture so that new services may easily be added to and co-operate with existing ones. Obsolete services may be replaced by new ones providing the same functionality. Services are de-coupled. Service co-operation is completely changed. This means that services react to the events they receive, irrespective of the events publishers. We also show how service-oriented and event-driven architectures may be combined maintaining their respective advantages. We introduce features of serviceoriented architectures to services co-operating via an eventbased middleware. We describe the formal model of a new system for mobile tourist information and the newly introduced features of the collaboration framework. Those features fundamentally change the way services communicate and cooperate.
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    Trust-based recommendations for mobile tourists in TIP
    (Working Paper, Department of Computer Science, The University of Waikato, 2008) Quan, Qiu; Hinze, Annika
    Recommender systems aim to suggest to users items they would like. However, concerns about the reliability of information from unknown recommenders influences user acceptance. In this paper, we analyse trust-based recommendations for the tourist information system TIP. We believe that the recommender strategy is closely related to the information domain applied. So, the delivered trust-based tourist recommendations have combined peers’ ratings on sights, trust computations and geographical constraints. We create two trust propagation models to spread trust in the TIP community. Three Trust based and location-aware filtering algorithms are implemented. According to research on feasibilities of trust in recommendation fields, three collaborative filtering algorithms in TIP are improved by introducing the trust concept.
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    Considering reachability when comparing data refinements
    (Working Paper, University of Waikato, Department of Computer Science, 2008-11-03) Reeves, Steve
    Adding considerations about reachability to the Logics of Specification Languages [1] chapter [2].
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    Mining meaning from Wikipedia
    (Working Paper, University of Waikato, Department of Computer Science, 2008-09) Medelyan, Olena; Legg, Catherine; Milne, David N.; Witten, Ian H.
    Wikipedia is a goldmine of information; not just for its many readers, but also for the growing community of researchers who recognize it as a resource of exceptional scale and utility. It represents a vast investment of manual effort and judgment: a huge, constantly evolving tapestry of concepts and relations that is being applied to a host of tasks. This article provides a comprehensive description of this work. It focuses on research that extracts and makes use of the concepts, relations, facts and descriptions found in Wikipedia, and organizes the work into four broad categories: applying Wikipedia to natural language processing; using it to facilitate information retrieval and information extraction; and as a resource for ontology building. The article addresses how Wikipedia is being used as is, how it is being improved and adapted, and how it is being combined with other structures to create entirely new resources. We identify the research groups and individuals involved, and how their work has developed in the last few years. We provide a comprehensive list of the open-source software they have produced. We also discuss the implications of this work for the long-awaited semantic web.
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    Metadata tools for institutional repositories
    (Working Paper, University of Waikato, Department of Computer Science, 2008-08) Nichols, David M.; Paynter, Gordon W.; Chan, Chu-Hsiang; Bainbridge, David; McKay, Dana; Twidale, Michael B.; Blandford, Ann
    Current institutional repository software provides few tools to help metadata librarians understand and analyse their collections. In this paper we compare and contrast metadata analysis tools that were developed simultaneously, but independently, at two New Zealand institutions during a period of national investment in research repositories: the Metadata Analysis Tool (MAT) at The University of Waikato, and the Kiwi Research Information Service (KRIS) at the National Library of New Zealand. The tools have many similarities: they are convenient, online, on-demand services that harvest metadata using OAI-PMH, they were developed in response to feedback from repository administrators, and they both help pinpoint specific metadata errors as well as generating summary statistics. They also have significant differences: one is a dedicated tool while the other is part of a wider access tool; one gives a holistic view of the metadata while the other looks for specific problems; one seeks patterns in the data values while the other checks that those values conform to metadata standards. Both tools work in a complementary manner to existing web-based administration tools. We have observed that discovery and correction of metadata errors can be quickly achieved by switching web browser views from the analysis tool to the repository interface, and back. We summarise the findings from both tools’ deployment into a checklist of requirements for metadata analysis tools.