Searching for authors named "Yannis Kotidis" – sorted by Relevance.
33 documents found, showing 1 through 10.
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Processing Proximity Queries in Sensor Networks
- …Sensor networks are often used to perform monitoring tasks, such as in animal or vehicle tracking and in surveillance of enemy forces in military applications. In this paper we introduce the concept of proximity queries that allow us to report interesting events that are observed by nodes in t…
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Snapshot Queries: Towards Data-Centric Sensor Networks
- …In this paper we introduce the idea of snapshot queries for energy efficient data acquisition in sensor networks. Network nodes generate models of their surrounding environment that are used for electing, using a localized algorithm, a small set of representative nodes in the network. These represen…
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Updates Through Views: A New Hope
- …Database views are extensively used to represent unmaterialized tables. Applications rarely distinguish between a materialized base table and a virtual view, thus, they may issue update requests on the views. Since views are virtual, update requests on them need to be translated to updates on the ba…
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Data Reduction Techniques in Sensor Networks
- …Recent advances in microelectronics have made feasible the deployment of sensor networks for a variety of monitoring and surveillance tasks. The severe energy constraints met in such networks make imperative the design of energy efficient protocols for communication, which often constitutes the larg…
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Hierarchical Graph Indexing
- …Tra#c analysis, in the context of Telecommunications or Internet and Web data, is crucial for large network operations. Data in such networks is often provided as large graphs with hundreds of millions of vertices and edges. We propose e#cient techniques for managing such graphs at the storage level…
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An Alternative Storage Organization for ROLAP Aggregate Views Based on Cubetrees
- …The Relational On-Line Analytical Processing (ROLAP) is emerging as the dominant approach in data warehousing with decision support applications. In order to enhance query performance, the ROLAP approach relies on selecting and materializing in summary tables appropriate subsets of aggregate views w…
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A Web-Services Architecture for Efficient XML Data Exchange
- …Business applications often exchange large amounts of enterprise data stored in legacy systems. The advent of XML as a standard specification format has improved applications interoperability. However, optimizing the performance of XML data exchange, in particular, when data volumes are large, is st…
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DynaMat: A Dynamic View Management System for Data Warehouses
- …Pre-computation and materialization of views with aggregate functions is a common technique in Data Warehouses. Due to the complex structure of the warehouse and the different profiles of the users who submit queries, there is need for tools that will automate the selection and management of the mat…
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A Case for Dynamic View Management
- …this paper, we present DynaMat, a system that manages dynamic collections of materialized aggregate views in a data warehouse. At query time DynaMat utilizes a dedicated disk space for storing computed aggregates that are further engaged for answering new queries. Queries are executed independently,…
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A Data Warehousing Architecture for Enabling Service Provisioning Process
- …In this paper we focus on the following problem in information management: given a large collection of recorded information and some knowledge of the process that is generating this data we want to build a compact, non-redundant collection of summary (aggregate) tables and indices to facilitate flex…
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