We describe a large sensor field whose mission is to protect coastal waters by detecting objects like submarines. The system is buoy-based and distributed over a littoral area. The opportunities for detection are short and intermittent and the signal to noise ratio is low. The topology of the field changes with time due to currents, wind, tides and storms. The field has a number of gateway node...

Target tracking is usually a challenging application for wireless sensor networks (WSNs) because it is always computation-intensive and requires real-time processing. This paper proposes a practical target tracking system based on the auto regressive moving average (ARMA) model in a distributed peer-to-peer (P2P) signal processing framework. In the proposed framework, wireless sensor nodes act ...

A simple programmable Java platform-independent distributed computation system has been developed to exploit the free resources on computers linked together by a network. It is a multi-tiered distributed system model, which is unbounded in principal. The system consists of an n-ary tree of nodes where the internal nodes perform the scheduling and the leaves do the processing. The scheduler node...

Recently, many studies have attempted to utilize mobile nodes as resources in mobile grids. Due to their underlying restrictions such as intermittent communication disconnections, limited battery capacity, and so on, mobile nodes are less reliable than wired nodes for job processing. Therefore, it is imperative to find an enhanced job scheduling method to provide stable job processing for mobil...

......The DOME project [1] is a collaboration between IBM and ASTRON, the Netherlands Institute for Radio Astronomy, to develop a computing solution to the exascale requirements for data processing of the international “Square Kilometer Array” radio telescope. One sub-project is the development of low cost low energy consumption microservers for processing the huge amount of data generated ever...

Wavelength-division multiplexing (WDM) technology has been improving steadily in recent years, with existing systems capable of providing huge amounts of bandwidth on a single fiber link. WDM systems are currently being deployed in long-distance telecommunication networks on a point-to-point basis, with the optical signals being converted back to electronics at each node. The electronic switchi...

The STAR experiment, in collaboration with the NERSC Scientific Data Management Group is prototyping / developing an approach to accomplish a high bandwidth data analysis capability using commodity components in a fault tolerant fashion. The prototype hardware consists of two small clusters of linux nodes (about 10 dual-CPU nodes), a few 100 GB local disk on each node. One cluster is at the RCF...

In wireless sensor networks, node failures occur frequently. The effects of these failures can be reduced by using aggregated values of small groups of sensors instead of the values of individual sensors. However, most existing works have focused on computing the aggregation of all the nodes without grouping. Only a few approaches proposed the processing of grouped aggregate queries. However, s...

The rapid progress of wireless communication and embedded micro-sensing MEMS technologies has made wireless sensor networks possible. A wireless sensor network normally comes a large area with many inexpensive, tiny sensor nodes, each capable of collecting, processing, and storing environmental information, and communicating with neighboring nodes. In the past, sensors are connected by wired li...

The κ-Nearest Neighbors ( κNN) query is an important spatial query in mobile sensor networks. In this work we extend κNN to include a distance constraint, calling it a l-distant κ-nearest-neighbors (l-κNN) query, which finds the κ sensor nodes nearest to a query point that are also at or greater distance from each other. The query results indicate the objects nearest to the area of interest tha...