IEEE802.15.4 is a standard which specifies the physical and medium access control for low-rate, low-cost, low-power Wireless Personal Area Networks (LR-WPANs). However, this protocol suffers from several types of collisions; In spite of being able to avoid data packets colliding with each other by using CSMA/CA, the risk of beacon collisions still remains specially in a cluster-tree network top...

IEEE802.15.4 is a standard which specifies the physical and medium access control for low-rate, low-cost, lowpower Wireless Personal Area Networks (LR-WPANs). However, this protocol suffers from several types of collisions; In spite of being able to avoid data packets colliding with each other by using CSMA/CA, the risk of beacon collisions still remains specially in a cluster-tree network topo...

Research shows that context is important to the privacy perceptions associated with technology. With Bluetooth Low Energy beacons, one of the latest technologies for providing proximity and indoor tracking, the current identifiers that characterize a beacon are not sufficient for ordinary users to make informed privacy decisions about the location information that could be shared. One solution ...

Researchers use four moves to show how their work is important, relevant, and novel: (1) Explain the significance of the research area, (2) Describe the status quo (current state of research) in the field, (3) Identify a " gap " in that research, and (4) Fill that gap with your project. This handout offers examples to highlight possible lexical bundles used to complete each move. Here, you shou...

This work describes a genetic algorithm based approach to approximate an optimal path for a mobile beacon node in a grid of stationary wireless sensors. As the beacon moves over the field of sensors it broadcasts its location. Sensors that are currently in the proximity of the beacon will receive this communication and can then use several of these messages to compute estimates on their locatio...

0278-6648/03/$17.00 © 2003 IEEE IEEE POTENTIALS Antenna arrays are individual radiating elements combined so that they function and perform like a single large antenna. Besides high radiating beam directionality, antenna arrays offer the capability to scan the main beam and control sidelobe radiation elect r o n i c a l l y . Retrodirective antenna arrays, as the name suggests, have a special f...

We have designed a new class of molecules, which we term aptamer beacons, for detecting a wide range of ligands. Similar to molecular beacons, aptamer beacons can adopt two or more conformations, one of which allows ligand binding. A fluorescence-quenching pair is used to report changes in conformation induced by ligand binding. An anti-thrombin aptamer was engineered into an aptamer beacon by ...

Spatial localization is an important building block for wireless sensor networks. Beacons that know their position and serve as reference are a vital aspect of nearly every localization system. In this paper, we look at dense beacon placement, which has a significant impact on the overall quality of localization. Based on the premise that uniformly dense beacon placement is not practical, we mo...

Localization is an important feature in Wireless sensor networks (WSNs). Accuracy in node localization with proper synchronization and required localization of sensor nodes, save node energy and enhance the performance of communication network protocols. In this paper we propose distributed localization algorithms and assume position known Cluster Head (CH) and position unknown three beacon nod...