Aggregate Query Processing In Sensor Networks

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Aggregate query processing in the presence of duplicates

Wireless sensor networks (WSNs) have received increasing attention in the past decade In existing studies for query processing of WSNs, each sensor node measures environmental parameters such as temperature, light and humidity around its locationEffective processing of continuous group-by aggregate ,They classify aggregates in sensor networks and define the structure of aggregates with a merging function f, an initializer i, and an evaluator e to compute aggregate queries in sensor networks Approximate query processing in sensor networks is very useful due to the property of sensor networksaggregate query processing in wireless sensor networ,Aggregate query processing in the presence of Wireless sensor networks (WSNs) have received increasing attention in the past decade In existing studies for query processing of WSNs, each sensor node measures environmental parameters such as temperature, light and humidity around its location

aggregate quarry processing sensor networks

Processing Approximate Aggregate Queries in Wireless , Processing Approximate Aggregate Queries in Wireless , While the nodes in sensor networks form an aggregation tree where messages areAccuracy Vs Lifetime: Linear Sketches for Appoximate ,carried toward (aggregate) query processing in sensor networks [20,21,23] The common approach to query processing in sensor networks has two phases Users specify queries at the base–station using an SQL–like query language During the dissemination phase the query layer interacts with the network layer for dissemination of the queries to Robust and Efficient Aggregate Query Processing in ,Robust and Efficient Aggregate Query Processing in Wireless Sensor Networks Kebin Liu & Lei Chen & Yunhao Liu & Minglu Li Published online: 8 May 2008 # Springer Science + Business Media, LLC 2008 Abstract Wireless sensor networks have been widely used in many applications, such as soil temperature monitoring

Robust and Efficient Aggregate Query Processing in

Wireless sensor networks have been widely used in many applications, such as soil temperature monitoring for plant growth and abnormal event detection of industrial parameters Among these applications, aggregate queries, such as SUM, COUNT, AVERAGE, MIN and MAX are often used to collect statistical On the Use of Histograms for Processing Exact Aggregate ,On the Use of Histograms for Processing Exact Aggregate Queries in Wireless Sensor Networks Khaled Ammar Mario A Nascimento Department of Computing Science, University of Alberta, Canada {kammar, mn}@csualbertaca ABSTRACT Wireless Sensor Networks (WSNs) are typically used to col-lect values of some phenomena in a monitored area In manyProcessing approximate aggregate queries in wireless ,For large sensor networks with severe energy constraints, the reduction (in the number of messages exchanged) obtained through the aggregation tree might not be sufficient In this paper, we present new algorithms for obtaining approximate aggregate statistics from large sensor networks

Assembling Regions for Efficacious Aggregate Query

Assembling Regions for Efficacious Aggregate Query Processing in Wireless Sensor Networks by Apostolos Fertis Diploma, Electrical and Computer Engineering (2003) National Technical University of Athens Submitted to the Department of Electrical Engineering and Computer Science in partial fulfillment of the requirements ofProcessing approximate aggregate queries in wireless ,For large sensor networks with severe energy constraints, the reduction (in the number of messages exchanged) obtained through the aggregation tree might not be sufficient In this paper, we present new algorithms for obtaining approximate aggregate statistics from large sensor networksAssembling Regions for Efficacious Aggregate Query ,Assembling Regions for Efficacious Aggregate Query Processing in Wireless Sensor Networks by Apostolos Fertis Diploma, Electrical and Computer Engineering (2003) National Technical University of Athens Submitted to the Department of Electrical Engineering and Computer Science in partial fulfillment of the requirements of

CAPS: Energy-Efficient Processing of Continuous Aggregate

CAPS: Energy-Efficient Processing of Continuous Aggregate Queries in Sensor Networks Wen Hu University of New South Wales National ICT Australia LimitedRouting and Processing Multiple Aggregate Queries in ,Routing and Processing Multiple Aggregate Queries in Sensor Networks Niki Trigoni Alexandre Guitton Antonios Skordylis Abstract Tree-based routing is an energy-efficient technique for evaluating Poster Abstract: Routing and Processing Multiple Aggregate ,Poster Abstract: Routing and Processing Multiple Aggregate Queries in Sensor Networks efcient mechanism for processing aggregate queries in sen-sor networks [1, 2] Tree construction is performed using Multi-query optimization for sensor networks In DCOSS, pages 307Œ321, 2005

Efficient processing of aggregation queries in sensor networks

In [16], a declarative database system for sensor networks was proposed to handle selection queries In [5, 9, 19], distributed index structures for various peer-to-peer spatial queries were proposed Several research issues in sensor networks include continuous query processing, dataAccuracy vs Lifetime: Linear Sketches for Aggregate ,gate queries over sensor networks in an energy–efficient manner From the databases perspective, in–network aggregation provides a mechanism for evaluating aggregate queries over sensor networks The common approach to (aggre-gate) query processing in sensor networks has two phases: the dissemination phase and the aggregation phase For TinyCasper: A Privacy-Preserving Aggregate Location ,niques designed for wireless sensor networks On the other side, the aggregate query processing module is embedded in-side the server to support aggregate query processing over anonymized locations TinyCasper system administrators can change the privacy requirement, ie, k-anonymity re-quirement, at anytime Finally, system users can issue snap-

Supporting Spatial Aggregation in Sensor Network Databases

network processing of the aggregation queries on the data generated in the sensor network We use the ad-hoc query routing algorithm of TAG to disseminate our query into the network Our spatial aggregate operators are compatible with the aggregate processing of TAG and easily portable to TinyDB Zhao et al in [9] introduce an architecture for Query Processing for Sensor Networks - Catch-all site,query layer for sensor networks The query layer accepts queries in a declarative language to ensure that the query processing layer is tightly in-tegrated with the networking layer Second, the notion simple aggregate queries with in-network aggregation (Section 3), and investigate the interaction between Robust Aggregation in Sensor Networks - csutahedu,on sensor networks has been advocated [24, 29], with particular attention paid to efficient query processing for aggregation queries [24, 29, 31] In the TAG system [24], users connect to the sensor network using a workstation or base station directly

Interplay of processing and routing in aggregate query

Interplay of processing and routing in aggregate query optimization for sensor networks Niki Trigoni Alexandre Guitton Antonios Skordylis Computing Laboratory, University of Oxford, Oxford OX1 3QD, UK Abstract This paper presents a novel approach to processing continuous aggre-aggregate query processing meaning - impiantirovitoit,aggregate query processing definition, optimizing aggregate queries in cache request: regionbased query processing in sensor networks the processing of grouped aggregate queri however, since a region in our approach is defined as a inside a circle having a diameter d by definition 1 【Live Chat】an aggregate query processing system for wireless network,Aggregate Query Processing In Sensor Networks an aggregate query processing system for wireless network aggregate query processing sensor works In order to solve these problems and to enhance the efficiency of aggregate query processing in wireless sensor works, this paper proposes

an aggregate query processing system for wireless network

Aggregate Query Processing In Sensor Networks an aggregate query processing system for wireless network aggregate query processing sensor works In order to solve these problems and to enhance the efficiency of aggregate query processing in wireless sensor works, this paper proposesCiteSeerX — Routing and Processing Multiple Aggregate ,This paper presents a query-driven approach to routing and processing continuous aggregate queries in sensor networks Given a query workload and a special-purpose gateway node where results are expected, the query optimizer exploits query correlations in order to generate an energyefficient distributed evaluation planAggregate Location Monitoring for Wireless Sensor Networks ,three proposed techniques, and the aggregate query pro-cessor Section 5 depicts the experiment results Finally, Section 6 concludes this paper 2 Related Works In this section, we highlight the related works in two areas, query processing in wireless sensor networks and spatio-temporal histograms Query processing in sensor networks

Routing and processing multiple aggregate queries in

Poster Abstract: Routing and Processing Multiple Aggregate Queries in Sensor Networks Niki Trigoni Alexandre Guitton Antonios Skordylis Birkbeck College, University of London, London WC1E 7HX, United Kingdom {niki,alexandre,adonis}@dcsbbkacuk Abstract We present a novel approach to processing continuous aggregate queries in sensor networks, which lifts the as- sumption of treeEnergy-Efficient Data Organization and Query Processing in ,Recent sensor networks research has produced a class of data stor-age and query processing techniques called Data-Centric Storage that leverages locality-preserving distributed indexes to efficiently answer multi-dimensional range and range-aggregate queries These distributed indexes offer a rich design space of a) logical decompo-sitions of Location Monitoring System in Wireless Sensor Networks ,preserves the privacy of the sensor node’s aggregate readings during transmission , data storage privacy that hides the data storage location , and query privacy that avoids disclosing the personal interests However, none of these previous works is applicable to our problem

Histogram and Other Aggregate Queries in Wireless Sensor

Histogram and Other Aggregate Queries in Wireless Sensor Networks processing a histogram query efficiently on top of WSN is a topic that query is an aggregate query, which provides a LNCS 3882 - Processing Multiple Aggregation Queries in Geo ,Processing Multiple Aggregation Queries in Geo-Sensor Networks 21 sensors close to the users serving as access points With existing techniques, in-dividual queries can be processed by forming independent routing trees with access points as the roots Due to independent topologies, the aggregatedresultsPoster Abstract: Energy›Efcient Data Organization and ,Query Processing in Sensor Networks range-aggregate query processing within our system Our system compiles an SQL query at the query issuer and con-structs an efcient query plan that includes an optimal join order using only locally available information in the form of a histogram

TinyDB: An Acquisitional Query Processing System for

Prior systems, however, tend to view query processing in sensor networks simply as a power-constrained version of traditional query processing: given some set of data, they 1 This is a preliminary release of an article accepted by ACM Transactions on Database SystemsQuery Processing in Sensor Networks,SENSOR AND ACTUATOR NETWORKS Query Processing in Sensor Networks R ecent advances in computing tech-nology have led to the production of a new class of computing devices: the wireless, battery-powered, smart sensor Traditional sensors deployed throughout buildings, labs, and equipment are passive devices that simply modulate a voltage onProcessing approximate aggregate queries in wireless ,Processing approximate aggregate queries in wireless sensor networks Nodes of the network form an aggregation tree, in which parent nodes aggregate the values received from their children and propagate the result to their own parents

Assembling regions for efficacious aggregate query

DSpace @ MIT Assembling regions for efficacious aggregate query processing in wireless sensor networks Research and Teaching Output of the MIT CommunityEfficient Iceberg Query Processing in Sensor Networks,In this paper, we propose an energy-efficient iceberg query processing technique in sensor networks COUNT, SUM and AVG are considered as aggregate functions of the iceberg queries To reduce the size of data transmitted, a lossless data compression method is,

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