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Database Issues for the Web - Dasfaa 2003 Panel -

Database Issues for the Web - Dasfaa 2003 Panel -. Dik Lun Lee Department of Computer Science Hong Kong University of Science and Technology. Characteristics of the Web. Publication of information by: Businesses, large and small Individuals

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Database Issues for the Web - Dasfaa 2003 Panel -

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  1. Database Issues for the Web- Dasfaa 2003 Panel - Dik Lun Lee Department of Computer Science Hong Kong University of Science and Technology

  2. Characteristics of the Web • Publication of information by: • Businesses, large and small • Individuals • No global rules or structures: structures and rules are spontaneously created by web authors • Result: we can only discover, not control, the web

  3. Why is Google so Successful • Exploit collective opinions of web authors • Use link analysis to identify web pages of high authority and/or quality • Use anchor texts as an indicator for web page theme • Both are created by human authors • Large scale ensures robustness Human-created index/knowledge Sub-consciously created Works only under large scale

  4. topics topics Beyond Google • Web communities • Topic distillation

  5. Research Issues: mining meaning • Derivation of concise and precise web communities • Link and content analysis • Integration of multiple sources of “intelligence”: Click-stream, search engine log, human-created directories: Open Directory and ontological databases • Creation of multiple hierarchies between communities • Topic drifting: restructuring of communities and their corresponding topics; migration of “drifted” pages to another community • Implementation: centralized versus peer-to-peer

  6. Research Issues: Mobile Web • Modeling of physical space to support, e.g., semantic nearest neighbors (time and space) • I am at the Kansei airport now, lead me to the platform for the Kyoto-bound train • Fine-grain, step by step instructions • Continuous monitoring to ensure I am at the right place at the right time • Processing nearest-neighbor, k-nn, window and continuous queries • Indexing of locations of data objects • Specialized index for NN and k-NN queries • Caching: validation of answers as user moves along • Connection: point-to-point, broadcast, continuous

  7. Research Issues: Wireless Web • Wireless mesh networks: nodes are connected wirelessly; peer-to-peer network with limited reach • Applications: sensor networks, low-cost substitution of 3G networks • Dissemination of large volume of data • How to announce availability of new data or updates? • Data broadcast; message hopping across the network • Filter on-the-air • Finding information on the network • Limited bandwidth and batter power: continuous active querying is discouraged

  8. Mobile/wireless web Summary Ubiquitous information access Personalization, query tracking Clustering, term suggestion, query tracking google, link analysis Ubiquitous information publication

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