Data-gathering wireless sensor networks (WSNs) are operated unattended over long time horizons to collect data in several applications such as those in climate monitoring and a variety of ecological studies. Typically, sensors have limited energy (e.g., an on-board battery) and are subject to the elements in the terrain. In-network operations, which largely involve periodically changing network...

In this position paper, we present our work towards designing a Semantic Web languages-compatible representation for networked sensors. The representation, Entity Notation, is proposed to connect sensors to the Semantic Web. Entity Notation can express RDF and OWL ontology models in a uniform format. Meanwhile, it offers a lightweight alternative for sensors with limited computation and communi...

A MEMS piezoresistive acoustic sensor has been developed for measurement of jet screech noise. The new sensor was calibrated in the sound field of an air siren. Two sensors with a size of 510 and 710 pm were tested and compared to commercial sensors. The results show that the MEMS sensors are five to eight times more sensitive than the smallest commercially available piezoresistive sensors. Fur...

A wireless sensor network (WSN) consists of two sets of nodes: sensors and actors, where the set of sensors performs all the sensing (data collection) from their surrounding environment. Since sensors operate by batteries, then they are limited with their processing and communication capabilities due to the short life-span of the batteries. On the other hand, the set of actors has more capabili...

Positek Limited L6 The Link Andoversford Industrial Estate Andoversford Cheltenham Gloucestershire GL54 4LB England Telephone (44) (0)1242 820027 Fax: (44) (0)1242 820615 Abstract With the increasing sophistication of electronic controls for mechanical systems to provide both accuracy and flexibility of control, there is more demand for durable, accurate and easy to use displacement sensors. Cu...

a bearingless induction machine has combined characteristics of induction motor and magnetic bearings. therefore, the advantages are small size and low-cost. in the magnetic suspension of the bearingless motors, suspension forces are generated based on the feedback signals of displacement sensors detecting the movement of the rotor shaft. the suspension forces are generated taking an advantage ...

Vehicle-mounted sensors have a limited detection range on a road with a gradient in relation to the vehicle infront. This study analyzes the performance on a road with a gradient of a forward collision warning system based on vehicle sensors. The level of warning given in relation to a vehicle infront is defined by the time-to-collision. Simulation results show that the forward collision warnin...

1. Introduction CMOS image sensors have received much attention over the last decade, offering the promise of ultra low power and camera-on-chip integration in standard fabrication processes. This year over 30 million such sensors have been shipped with estimated annual growth rate of over 40%. Most CMOS image sensors shipped today are application-specific (e.g., optical mouse) or used in low-e...