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Due to the traditional wireless networks, fixed allocation of spectrum is one of the main reasons causing low utilization of spectrum. To solve the problem, a new wireless communication model has been proposed, which called Cognitive Radio Networks (CRN). CRN adopts Dynamic Spectrum Access (DSA) technology, thus it can flexibly use the spectrum which primary user temporarily unused. In cognitive radio...
The wireless sensor networks (WSNs) are one of the popular information and communication technologies (ICTs) in different application areas. One of the important issue and technology in WSNs is to collect sensing data efficiently and deliver them to base station (BS) reliably. In most previous researches and proposed methodologies are using Geographic routing techniques. Based on them, the sensors...
In traditional wireless networks, fixed allocation of spectrum is one of the main reason causing low utilization of spectrum. In order to solve this problem, a new wireless communication model has been proposed, which called Cognitive Radio Networks (CRN). CRN adopts Dynamic Spectrum Access (DSA) technology, thus it can flexibly use the spectrum which primary user temporarily unused. In cognitive...
How to save energy for target tracking in WSNs is an important issue. The basic idea of energy-saving method is using sleep mechanism. However, if nodes enter sleep state too much, targets may lose easily from the sleeping nodes. It is high consuming the energy to find back these losing targets. Thus, it would notice accuracy of tracing targets when saving energy. In this proposal, it offers a scheme...
Wireless Sensor Networks (WSNs) can be widely utilized in many applications, especially in environmental surveillance. However, there exists some holes within the WSNs caused by some factors, such as non-uniform deployment of sensor nodes, some depletion of energy from sensor nodes, the destruction from external forces and the existences of physical obstacles, such as mountains and lakes. These holes...
In wireless sensor networks, sensor nodes will transmit the sensing data to sink through multi-hop, this kind of transmission will cause the hotspot problem, and also the effectiveness of sensing data will be decreased in larger network environment. To solve all these problems, we propose an instantaneous data dissemination mechanism which can use multiple mobile sinks to collect the sensing data...
In line with the popularity of Internet and the development of search engine, users request information through Web-based services. Although general purpose searching such as one provided by Google is powerful, searching mechanism for specific purposes could rely on metadata. We followed SCORM and CORDRA specifications to develop a registry system, called the MINE Registry, for storing and sharing...
In wireless sensor networks, ??holes?? are hardly to know its location and avoid either because of various actual geographical environments. A hole can be dynamically formed due to unbalanced deployment, failure or power exhaustion of sensors, animus interference, or physical barriers such as buildings or mountains. Hence, we hope to propose the RNG Hole Avoiding Routing protocol, RNGHAR which can...
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