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Range finding is a core service in many applications for smart homes and cities. Recently studies have been exploring ultrasound-based range finding with commercial-off-the-shelf (COTS) mobile devices. Yet their accuracy is largely bounded by the limited sample rate (typically up to 48 kHz; i.e. only sensitive to sound below 24 kHz) of their built-in microphones and chips. In this paper, we introduce...
This work presents a new class of gas sensing scheme: the phase sensitive signal on the GFET (Graphene Field Effect Transistor) gas sensors aiming to boost the response speed. Compared with the state-of-art gas sensing reports on measurements of DC resistance changes which are limited by trap states, three distinctive advancements have been achieved on graphene FETs in responses to water vapor: (1)...
With the rapid development of mobile networking and device capability, energy efficiency becomes an important design consideration due to the limited battery life of mobile terminals. Processing energy cost by CPU is one of the most significant power consuming components in mobile terminals. The emergence of mobile cloud computing (MCC) provides the opportunity to save processing energy through the...
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