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- W78709621 abstract "Our Continuous Adaptive Monitoring (CAM) system provides responses for continuous queriesby monitoring and extracting information scattered across the web. Continuous queries are the queries for which responses given to users must be continuously updated, as the sources of interest get updated. Such queries occur, for instance, during on-line decision making, e.g., traffic flow control, weather monitoring etc. Whereas push-based techniques may be able to refresh query results meeting user requirements, they do not scale well. With the pull based approach, the problem of keeping the responses current reduces to the problem of deciding how often to visit a source to determine if and how it has been modified so that a user response can be updated accordingly. As should be evident, periodical monitoring is not scalable. Also, it can lead to huge wastage of monitoring resources. Hence CAM employs a multiphase approach. In the tracking phase, changes to an initially identified set of relevant pages, are tracked. From the observed change characteristics of these pages, a probabilistic model of their change behaviour is formulated and weights are assigned to pages to denote their importance for the current queries. Based on these statistics, during the next phase, the Resource Allocation phase, resources, needed to continuously monitor these pages for changes, are allocated. Given these resource allocations, the Scheduling phase produces an optimal achievable schedule of monitoring. An experimental evaluation of our approach compared to prior approaches on synthetic data for crawling dynamic web pages shows the effectiveness of our approach to monitoring dynamic changes. For example, by monitoring just 5% of the possible change instances, CAM is able to return 90% of the changed information to the users. In this demonstration, we show how CAM keeps users up-to-date with respect to a set of ongoing sports related events." @default.
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- W78709621 date "2003-01-01" @default.
- W78709621 modified "2023-09-26" @default.
- W78709621 title "Monitoring the Dynamic Web to respond to Continuous Queries: A Demonstration" @default.
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