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We present WRENSys, a system that allows for a low cost, rapidly deployable, large-scale and easy to maintain wireless mobile network, with minimal subject interference, to study contact networks of a population. We discuss our experiences with several hardware designs, including our new WREN sensor, base stations for charging and programming 2000 motes in parallel, software applications, and our...
Energy harvesting has been widely considered in many wireless applications, especially the wireless sensor networks. This paper develops a novel approach to energy-harvesting powered transmissions under arbitrary packet arrival process and strict deadline constraints over time-varying channels. It is shown that the problem can be formulated as a convex program. Relying on the specific structure of...
Recent advancements in wireless communication and electronics have led to the development of low-cost wireless sensor networks (WSNs). A wireless sensor network consists of a large deployment of sensor nodes across a geographical area. When radio applications are considered, the sensor nodes sense the data and broadcast the sensed data to the destination or access point. In most applications, the...
In these years, disasters often occurred in Japan and abroad. When the disaster happen, general communication methods, e.g., cell phone, may not work well due to the damage of communication infrastructure or restriction of usage of communication resources. How to let users quickly confirm safety is a critically important problem after a disaster. Therefore, we propose a design of safety confirmation...
Smart grid integrates the latest advances in information and communication technologies to contribute to a more reliable and efficient electricity system. By realizing the two-way communication between the utility and the smart meters in the houses, smart grid enables a time-of-use tariff to reduce peak load through incenting residents to adopt a more efficient usage of domestic appliances. In this...
The majority of wireless sensor networks are built on bespoke platforms, that is, custom designed and built hardware with a light weight software stack. There are a number of advantages to this approach. First, the ability to closely match and minimise the resource requirements (e.g., power consumption and communications protocols) to those that are suitable for the intended deployment. Second, as...
This paper describes recent work on the development of a wireless based remote monitoring system for renewable energy plants in Malawi. The main goal was to develop a cost effective data acquisition system that continuously presents remote energy yields and performance measures. A test bed comprising of a solar photovoltaic (PV) power plant has been set up at Malavi Primary School and a central management...
In wireless sensor networks (WSN), the measurement data of the neighbor nodes often have little differences. In view of this situation, a new algorithm called NNA based on layered routing protocol is proposed. By comparing the measurement data of the node with the cluster head's, if the difference of the data value is less than the threshold value set by the system, then the node will join to the...
One of the most challenging research tasks in the field of wireless sensor networks is controlling the power consumption of batteries and prolonging network lifetime. For sensor networks which consist of a large number of sensor nodes, self-organized control is more suitable than centralized control. In particular, research on bio-inspired self-organization methods attracts attention due to the potential...
This papers deals with the new subject for education of mechatronics in Brno University of Technology. The new subject “Energy Harvesting” is prepared for students of the master study programme mechatronics. This subject presents overview of power sources for autonomous mechatronic applications. Nowadays power sources can be classified as energy reservoirs (batteries, super-capacitors, fuel cells,...
Expected growth in use and implementation of wireless sensor networks (WSNs) in different environments and for different applications creates new security challenges. In WSNs, a malicious node may initiate incorrect path information, change the contents of data packets, and even hijack one or more genuine network nodes. As the network reliability completely depends on individual nodespsila presence...
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