Keyi Zhang

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The Internet of Things (IoT) promises to allow everyday objects to connect to the Internet and seamlessly interact with users and other machines. For this vital Internet connection, most current IoT devices use a personal gateway device such as a smartphone or a home WiFi access point. The necessity of configuring and maintaining these gateways presents an(More)
As sensors become more affordable and versatile, more and more sensors are deployed in different environments to help people observe their surroundings. However, due to their various physical structures, it is very challenging to have a universal schema to identify, search, and query sensors and sensors' data. Fortunately, there are two main approaches to(More)
The Internet of Things (IoT) promises to allow everyday objects to connect to the Internet and interact with users and other machines ubiquitously. Regional networks such as LoRa and Sigfox have been deployed to provide connectivity to end devices, where multiple channels are used to increase network capacity. However, channel synchronization can induce(More)
As sensors become more affordable, sensor networks are increasingly deployed to monitor diverse environments. However, these sensor network deployments often utilize different standards for communication and data storage. As a result, it is challenging to build large-scale pervasive systems able to find, query, and analyze information across a diverse set(More)
Energy-constrained wireless networks have limited lifetimes, largely confining the network performance. Radio frequency (RF) energy transfer and harvesting techniques enable wireless devices to replenish their energy. In this paper, by jointly considering the benefits of directional antenna by which a power beacon (PB) can transfer energy to desired sectors(More)
In this paper, a compound eye array model which consists of hexagonal dome light receivers arranged on a hemispherical surface for capturing, aiming and tracking laser channel of satellite space communication is proposed and the laser beam aiming algorithm is bought out for angular positioning of the laser direction by the light intensity distribution from(More)
Low-Power Wide-Area networks promise to deliver limited IoT payloads reliably at distances in excess of 10 km raising the possibility of thousands of IoT devices connected to a single base station. PlanIt is a web application able to visualize connectivity in these large-scale deployments prior to deploying hardware or even making a single signal-strength(More)
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