02-07-2010, 04:56 PM
Connectivity Restoration in Wireless Sensor and Actor Networks
Abstractâ€
Recent years have witnessed a growing interest in applications of wireless sensor and actor networks (WSANs). In these applications, a set of mobile actor nodes are deployed in addition to sensors in order to collect sensorsâ„¢ data and perform specific tasks in response to detected events/objects. In most scenarios, actors have to respond collectively, which requires interactor coordination. Therefore, maintaining a connected interactor network is critical to the effectiveness of WSANs. However, WSANs often operate unattended in harsh environments where actors can easily fail or get damaged. An actor failure may lead to partitioning the interactor network and thus hinder the fulfillment of the application requirements. In this paper, we present DARA, a Distributed Actor Recovery Algorithm, which opts to efficiently restore the connectivity of the interactor network that has been affected by the failure of an actor. Two variants of the algorithm are developed to address 1- and 2-connectivity requirements. The idea is to identify the least set of actors that should be repositioned in order to reestablish a particular level of connectivity. DARA strives to localize the scope of the recovery process and minimize the movement overhead imposed on the involved actors. The effectiveness of DARA is validated through simulation experiments.
Existing System:
Proposed System:
WIRELESS sensor and actor networks (WSANs) have attracted lots of interest in recent years due to their potential use in numerous applications such as boarder protection, battlefield reconnaissance, space exploration, search and rescue, etc. A typical WSAN consists of a larger set of miniaturized sensor nodes reporting their data to significantly fewer actor (actuator) nodes [1]. Sensors probe their surroundings and report their findings to one or multiple of actors, which process the collected sensor readings and respond to emerging events of interest. An actorâ„¢s response would depend on its capabilities, which vary based on the application and the expected role the actor plays. For example, an actor can deactivate a landmine, extinguish a fire, and rescue a trapped survivor. It is worth noting that a heterogeneous set of actors may be employed and assigned complementary roles. In most application setups, actors need to coordinate with each other in order to share and process the sensorsâ„¢ data, plan an optimal response and pick the most appropriate subset of actors for executing such a plan.
Hardware Requirements
¢ SYSTEM : Pentium IV 2.4 GHz
¢ HARD DISK : 40 GB
¢ FLOPPY DRIVE : 1.44 MB
¢ MONITOR : 15 VGA colour
¢ MOUSE : Logitech.
¢ RAM : 256 MB
¢ KEYBOARD : 110 keys enhanced.
Software Requirements
¢ Operating system :- Windows XP Professional
¢ Front End :- Java Technology
