web-based applications have become ubiquitous over the past few years. these applications rely on a simple document markup language called HTML. However, the click-and-link interface provide by HTML-based technology i...
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the Email systems are playing an important and irreplaceable role in the digital world due to its convenience, efficiency and the rapid growth of World Wide web (WWW). However, most of the email users nowadays are suf...
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web crawler is program used to download documents from the web site. this paper presents the design of a distributed web crawler on grid platform. this distributed web crawler is based on our previous work Igloo. Each...
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Two panels, held at SIGMOD'98 (Seattle, June 4) and CAiSE'98 (Pisa, June 11), discussed the topic of data semantics and its place in Databases research in the next millennium. the first, titled "Next Gene...
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(纸本)354025207X
Two panels, held at SIGMOD'98 (Seattle, June 4) and CAiSE'98 (Pisa, June 11), discussed the topic of data semantics and its place in Databases research in the next millennium. the first, titled "Next Generation Database Systems Won't Work Without Semantics" included as panelists Philip Bernstein, Umesh Dayal, John Mylopoulos (chair), Sham Navathe and Marek Rusinkiewicz. the second one, titled "Data Semantics Can't Fail this Time!" included as panelists Michael Brodie, Stefano Ceri, John Mylopoulos (chair), and Arne Solvberg. Atypically for panels, participants to both discussions generally agreed that data semantics will be the problem for Databases researchers to tackle in the near future. Stefano Ceri summed up well the sentiments of the discussions by declaring that "...the three most important research problems in Databases used to be 'Performance', 'Performance', and 'Performance';in years to come, the three most important and challenging problems will be 'Semantics', 'Semantics', and 'Semantics'..." What is the data semantics problem? In what sense did it "fail" in the past?... And why did the experts agree - unanimously - that the situation was about to change? We review the data semantics problem and its long history in Databases research, noting the reasons why solutions of the past won't work in the future. We then review recent work on the Semantic web and the directions it is taking. Finally, we sketch two new directions for research on data semantics.
Flood control for reservoirs require operations in a dynamic and cooperative manner in order to respond to the changing flood control conditions. there is an increasing emphasis on the collaboration of multiple partne...
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In order to get high-quality web pages, search engines often resort retrieval pages by their ranks. the rank is a kind of measurement of importance of pages. Famous ranking algorithms, including PageRank and HITS, mak...
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Many machine learning and data mining algorithms crucially rely on the similarity metrics. However, most early research works such as Vector Space Model or Latent Semantic Index only used single relationship to measur...
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A distributed web caching system can supply fast and stable transmission of information to the user avoiding a congested network section, storing and supplying the content that the user requested to cache by distribut...
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there are innumerable objects found on the web. Boththe popular objects that are requested frequently by the users and unpopular objects that are rarely requested exist. Hot spots are produced whenever huge numbers o...
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We present a knowledge-rich software agent, ContextExplicator, which mediates between the web and the user's information or knowledge needs. It provides a method for incremental knowledge-level management (i.e., k...
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