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aggregate query processing sensor networks

Processing approximate aggregate queries in wireless ...

In-network data aggregation has been recently proposed as an effective means to reduce the number of messages exchanged in wireless sensor networks. Nodes of the network form an aggregation tree, in which parent nodes aggregate the values received from their …

Processing Approximate Aggregate Queries in Wireless ...

routing [4, 26] and in-network query processing [14, 15, 16, 28]. A survey of the applications and the challenges that sensor networks introduce is presented in [10]. For monitoring queries that aggregate the observed values from a group of sensor nodes, [14] suggested the construction of a greedy aggregation tree that seeks to maximize the ...

TinyCasper: A Privacy-Preserving Aggregate Location ...

monitor moving objects in wireless sensor networks while preserving their location privacy. TinyCasper consists of two main modules, in-network location anonymization and aggregate query processing over anonymizedlocations. Inthe rst module, trusted wireless sensor nodes collaborate with each other to anonymize users' exact locations by a cloaked

Aggregate Location Monitoring for Wireless Sensor …

location-based query processing in wireless sensor networks. However, since all previous works in this area rely on users' exact locations and/or identities, none of these works consider query processing over aggregate location data. Spatio-temporal histograms. Research efforts for spatio-temporal histograms aim to provide selectivity ...

Supporting Spatial Aggregation in Sensor Network …

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 ...

(PDF) 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}@dcs.bbk.ac.uk Abstract We present a novel approach to processing continuous aggregate queries in sensor networks, which lifts the as- sumption of tree-based routing.

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 data.

Processing Approximate Aggregate Queries in Wireless ...

CiteSeerX - Document Details (Isaac Councill, Lee Giles, Pradeep Teregowda): In-network data aggregation has been recently proposed as an e#ective means to reduce the number of messages exchanged 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 …

Robust and Efficient Aggregate Query Processing in ...

Robust and Efficient Aggregate Query Processing in Wireless Sensor Networks Article in Mobile Networks and Applications 13(1-2):212-227 · April 2008 with 37 Reads How we measure 'reads'

Aggregate query processing in the presence of duplicates ...

Aggregate query processing in the presence of duplicates in wireless sensor networks. Author links open overlay panel Jun-Ki Min a Raymond T. Ng b Kyuseok Shim c. ... In WSNs with such sensors, an object may be detected by several sensor nodes and processing of aggregate queries (such as COUNT, SUM and AVERAGE) becomes problematic since an ...

CiteSeerX — In-network Query for Wireless Sensor Networks

CiteSeerX - Document Details (Isaac Councill, Lee Giles, Pradeep Teregowda): Recently, in-network aggregate query processing techniques have problems such as high energy consumption in sensor nodes, low accuracy of query processing results, and long query processing time. In order to solve these problems and to enhance the efficiency of aggregate query processing in wireless sensor networks ...

Routing and Processing Multiple Aggregate Queries in ...

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 plan.

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 of

Accuracy Vs Lifetime: Linear Sketches for Appoximate ...

Sensor network applications rely heavily on aggregate queries. Queries are also considered a natural way for users to interact with the sensor network [23]. Therefore, several studies have been carried toward (aggregate) query processing in sensor networks [20,21,23]. The common approach to query processing in sensor networks has two phases.

Effective processing of continuous group-by aggregate ...

To effectively 1 process continuous group-by aggregate queries in sensor networks, we consider the following two factors. • Approximate processing: A sensor gets sensor readings from the device. However, no matter how much the device is advanced, there are gaps between real values and sensor readings.

Processing approximate aggregate queries in wireless ...

Processing approximate aggregate queries in wireless sensor networks ... This is a recursive procedure which ultimately results in the evaluation of the aggregate query at the Root node. After waiting for messages from its children nodes, the current node computes the new value of the partial aggregate based on the most current partial ...

Poster Abstract: Routing and Processing Multiple Aggregate ...

We present a novel approach to processing continuous aggregate queries in sensor networks, which lifts the as-sumption of tree-based routing. Given a query workload and a special-purpose gateway node where results are ex-pected, the query optimizer exploits query correlations in order to generate an energy-efcient distributed evaluation plan.

Processing approximate aggregate queries in wireless ...

[14,15] and in-network query processing [2,5,7,16]. A survey of the applications and the challenges that sensor networks introduce is presented in [4]. For monitoring queries that aggregate the observed values from a group of sensor nodes, [5] suggested the construction of a greedy aggrega-tion tree that seeks to maximize the number of

Processing approximate aggregate queries in wireless ...

Request PDF on ResearchGate | Processing approximate aggregate queries in wireless sensor networks | Abstract In-network data aggregation has been recently proposed as …

Optimized Query Processing for Wireless Sensor Networks

Optimized Query Processing for Wireless Sensor Networks d a 1. I NTR ODUCI Recently sensor networks are used in various domains of computer applications. Infinite property and scalability of them give chance to getting around information in the highest resolution that impossible in previous technologies. They are used from military search to

aggregate query processing in sensor networks

Approximate Aggregation Techniques for Sensor Databases. tention paid to efficient query processing for aggregate queries [15, 20, 23]. In the TAG system [15], users connect to the sen- sor network using a workstation or...

TinyCasper: A Privacy-Preserving Aggregate Location ...

This demo presents a privacy-preserving aggregate location monitoring system, namely, TinyCasper,inwhichwecan monitor moving objects in wireless sensor networks while preserving their location privacy. TinyCasper consists of two main modules, in-network location anonymization and aggregate query processing over anonymized locations.Inthe

aggregate query processing sensor networks

Aggregate Query Processing In Sensor Networks. Aggregate query processing in the presence of duplicates. In addition, when the sensing areas of sensor nodes are disjoint, the coordinator of each sensor becomes itself and we perform traditional aggregate query processing. Thus, the problem we are considering is a generalization of the ...

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 …

aggregate query processing sensor networks

Sensor network applications rely heavily on aggregate queri Queries are also considered a natural way for users to interact with the sensor network [23] Therefore, several studies have been carried toward (aggregate) query processing in sensor networks [20,21,23] The common approach to query processing in sensor networks has two phas

Aggregate Location Monitoring for Wireless Sensor Networks ...

location-based query processing in wireless sensor networks. However, since all previous works in this area rely on users' exact locations and/or identities, none of these works consider query processing over aggregate location data. Spatio-temporal histograms. Research efforts for spatio-temporal histograms aim to provide selectivity ...

Robust Aggregation in Sensor Networks

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 connected to a sensor designated as the sink.

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-

Efficient Iceberg Query Processing in Sensor Networks

Efficient Iceberg Query Processing in Sensor Networks Heejung Yang and Chin-Wan Chung∗ Department of Computer Science, KAIST, Daejeon 305-701, Republic of Korea ∗Corresponding author: [email protected] The iceberg query finds data whose aggregate values exceed a pre-specified threshold. To process

The Design and Evaluation of a Query Processing ...

The Design and Evaluation of a Query Processing Architecture for Sensor Networks by Ross Madden Doctor of Philosophy in Computer Science University of California, Berkeley Professor Michael J. Franklin, Chair With the advent of small, battery-powered, wireless computing and sensing technology, it is