Network sensors consist of sensor nodes in which every node covers a limited area. The most common use ofthese networks is in unreachable fields.Sink is a node that collects data from other nodes.One of the main challenges in these networks is the limitation of nodes battery (power supply). Therefore, the use oftopology control is required to decrease power consumption and increase network acce...

A wireless sensor network is a network of power restricted nodes with the ability of sensing and communication covering a large region. Unlike its significant advancements in many areas; maximizing the lifetime of the whole network remains a major hindrance. Various protocols and approaches have been into existence to overcome this pitfall. One of the approaches is optimizing the angle by which...

wireless sensor networks are composed of hundreds or thousands of small nodes called sensor that work together and are associated with a specific task or tasks to do. each of these nodes includes sensor, processor, communication components, a small memory and a source of energy. it is expected that wireless sensor networks will be used widely in many applications in near future. scalability and...

In terms of using the technology Cognitive Radio, a Sensor Network (CSN) is varied from conventional Wireless Networks (WSNs). According to interaction with surrounding environment, transmitter parameters can be modified in sensor nodes CSN adaptively. CSNs, routing one important components. Based on capability spectrum-aware, schemes CSNs are district other networks. The changeable spectrum re...