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In order to improve the reliability of the status perception, this paper defines a metric QoSTD to measure the quality of the subjectively labelled training data used with K-means clustering. On the basis of QoSTD, we propose a method that utilizes a support vector support (SVM) model to predict the specified states of an individual's status. We also present a way to determine a threshold for QoSTD...
The database-driven spectrum access system recentlyattracted increasing amounts of attention. It has more benefits compared to the traditional sensing-based systems. To build a more practical and reliable system, a hybrid sensing-based and database-driven spectrum access system is a promising solution. In this paper, we consider the integration problem of the database information and sensing results,...
The effect of Pd decoration on the gas sensing properties of vanadium oxide nanotubes (VONTs) was investigated. The Pd nanoparticles with diameter of 2–5nm were uniformly loaded on the surface of VONTs via a microwave irradiation. After loading Pd nanoparticles on the surface of VONTs, the gas sensing properties of the sensor displayed an enhancement in response to ethanol compared with pure VONTs...
Cooperative spectrum sensing is an efficient sensing scheme for cognitive radio networks (CRNs), in which secondary users (SUs) share sensing results with other SUs to improve the overall sensing performance. For a single SU, if the sensing results are shared early, there is more time for data transmission, which improves the throughput. In cases with multiple SUs sending early sensing results, it...
This paper considers a pre-phase of spectrum sensing in cognitive radio networks (CRNs), which is about how to choose a channel for spectrum sensing. We take the time dimension, spectrum dimension, and spacial dimension into account and propose a sense-in-order model. In this model, each node maintains four states regarding each channel, based on the neighbors' shared information. We construct a state...
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