Cognitive radio technology enables unlicensed users (secondary users, SUs) to access the unused licensed spectrum which is allocated to primary users (PUs). In the literature, there are three traditional spectrum sharing paradigms that enable SUs to access the licensed spectrum. These access techniques include underlay, overlay and spectrum trading, and have their own drawbacks. To combat these...

On 100 sputum specimens selected from patients suffering from chronic bronchitis, bronchiectasis, asthma, and cystic fibrosis total deoxyribonucleic acid (DNA) content has been related to macroscopic type, to total dry weight yield, and to the apparent viscosity of the secretion at 1350 s-1: since DNA may be present, either as fibres or within cells, in one-third of the specimens the contribut...

Recently, a new paradigm for cognitive radio networks has been advocated, where primary users (PUs) recruit the secondary users (SUs) to cooperatively relay the primary traffic, and in return grant the SUs the right to access the channel. However, all existing work on such cooperative cognitive radio networks (CCRNs) operate in the temporal domain only, which limits the performance of both PUs ...

In this paper, we study the incentive mechanism design for real-time data aggregation, which holds a large spectrum of crowdsensing applications. Despite extensive studies on static incentive mechanisms, none of these are applicable to real-time data aggregation due to their incapability of maintaining PUs’ long-term participation. We emphasize that, to maintain PUs’ long-term participation, it...

Alternative splicing (AS) is a major mechanism of increasing proteome diversity in complex organisms. Different AS transcript isoforms may be translated into peptide sequences of significantly different lengths and amino acid compositions. One important question, then, is how AS is constrained by protein structural requirements while peptide sequences may be significantly changed in AS events. ...

The emerging applications of the small-scale primary-user (PU) paradigm require Cognitive Radio (CR) networks to explicitly support the mobility of a multitude of PUs, concurrently using the same spectrum band. In this paper, the effects of multiple mobile PUs on the spectrum sensing functionality are analyzed to jointly maximize the sensing efficiency and the sensing accuracy. To this aim, as ...

Incentive mechanism plays a critical role in privacyaware crowdsensing. Most previous studies on co-design of incentive mechanism and privacy preservation assume a trustworthy fusion center (FC). Very recent work has taken steps to relax the assumption on trustworthy FC and allows participatory users (PUs) to add well calibrated noise to their raw sensing data before reporting them, whereas the...

Effects of oscillating flows on the frequency spectrum of back-sampled pulsed ultrasound signals (PUS) are investigated both experimentally and theoretically. Simulation results revealed that while coherent component of velocity is encoded in the phase of the PUS, oscillating component is observed in terms of the amplitude and variance of the signal. The attenuation and variance increase on PUS...

In this paper, we study the relay-based communication schemes for cooperative spectrum sharing among multiple primary users (PUs) and multiple secondary users (SUs) with incomplete information. Inspired by contract theory, we model the network as a labor market. In this market, PUs and SUs are regarded as employer and employee respectively. Each PU proposes certain contracts to attract the SUs,...