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- W2113280181 abstract "Given two positive parameters k and r, a constrained k-nearest neighbor CkNN query returns the k closest objects within a network distance r of the query location in road networks. In terms of the scalability of monitoring these CkNN queries, existing solutions based on central processing at a server suffer from a sudden and sharp rise in server load as well as messaging cost as the number of queries increases. In this paper, we propose a distributed and scalable scheme called DAEMON for the continuous monitoring of CkNN queries in road networks. Our query processing is distributed among clients query objects and server. Specifically, the server evaluates CkNN queries issued at intersections of road segments, retrieves the objects on the road segments between neighboring intersections, and sends responses to the query objects. Finally, each client makes its own query result using this server response. As a result, our distributed scheme achieves close-to-optimal communication costs and scales well to large numbers of monitoring queries. Exhaustive experimental results demonstrate that our scheme substantially outperforms its competitor in terms of query processing time and messaging cost." @default.
- W2113280181 created "2016-06-24" @default.
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- W2113280181 date "2012-01-01" @default.
- W2113280181 modified "2023-09-27" @default.
- W2113280181 title "A Distributed Approach to Continuous Monitoring of Constrained k-Nearest Neighbor Queries in Road Networks" @default.
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- W2113280181 doi "https://doi.org/10.3233/mis-2012-0134" @default.
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