14 documents found, page 1 of 2
Z-Monitor: A protocol analyzer for IEEE 802.15.4-based low-power wireless networks
Tennina, Stefano; Gaddour, Olfa; Koubaa, Anis; Royo, Fernando; Alves, Mário; Abid, MahomedNetwork sniffers are invaluable tools for designing, testing, commissioning and running distributed embedded systems. They become even more useful if these systems build on low-power wireless networks (LoWPAN), particularly when these scale in density and/or space and impose stringent quality-of-service requirements. This paper presents Z-Monitor, a low-cost and open-source network/protocol analyzer for LoWPANs...
A microscope for the data center
Pereira, Nuno; Tennina, Stefano; Loureiro, João; Severino, Ricardo; Saraiva, Bruno; Santos, Manuel; Pacheco, Filipe; Tovar, EduardoNowadays, data centers are large energy consumers and the trend for next years is expected to increase further, considering the growth in the order of cloud services. A large portion of this power consumption is due to the control of physical parameters of the data center (such as temperature and humidity). However, these physical parameters are tightly coupled with computations, and even more so in upcoming da...
Distributed Forest Fire Monitoring Using Wireless Sensor Networks
Serna, M. Ángeles; Casado, Rafael; Bermúdez, Aurelio; Pereira, Nuno; Tennina, StefanoDisaster management is one of the most relevant application fields of wireless sensor networks. In this application, the role of the sensor network usually consists of obtaining a representation or a model of a physical phenomenon spreading through the affected area. In this work we focus on forest firefighting operations, proposing three fully distributed ways for approximating the actual shape of the fire. In...
Response Time Analysis of Slotted WiDOM in Noisy Wireless Channels
Vahabi, Maryam; Tennina, Stefano; Tovar, Eduardo; Andersson, BjörnTimely delivery of critical traffic is a major challenge in industrial applications. The Wireless Dominance (WiDOM) medium access control protocol offers a very large number of priority levels to suit time sensitive application requirements. In particular, assuming that its overhead is properly modeled, WiDOM enables an accurate evaluation of the network response time in the wireless domain, through the power o...
Response time analysis of slotted WiDom in noisy wireless channels
Vahabi, Maryam; Tennina, Stefano; Tovar, Eduardo; Andersson, BjörnWiDom is a wireless prioritized medium access control protocol which offers very large number of priority levels. Hence, it brings the potential to employ non-preemptive static-priority scheduling and schedulability analysis for a wireless channel assuming that the overhead of WiDom is modeled properly. Recent research has created a new version of WiDom (we call it: Slotted WiDom) which offers lower overhead co...
Building a microscope for the data center
Pereira, Nuno; Tennina, Stefano; Tovar, EduardoManaging the physical and compute infrastructure of a large data center is an embodiment of a Cyber-Physical System (CPS). The physical parameters of the data center (such as power, temperature, pressure, humidity) are tightly coupled with computations, even more so in upcoming data centers, where the location of workloads can vary substantially due, for example, to workloads being moved in a cloud infrastructu...
EMMON - EMbedded MONitoring
Santos, Manuel; Tennina, Stefano; Alves, Mário; Bouroche, Mélanie; Cahill, Vinny; Almeida, Délio; Carrozza, Gabriella; Hill, Alex; Chasapis, GeorgiosDespite the steady increase in experimental deployments, most of research work on WSNs has focused only on communication protocols and algorithms, with a clear lack of effective, feasible and usable system architectures, integrated in a modular platform able to address both functional and non–functional requirements. In this paper, we outline EMMON [1], a full WSN-based system architecture for large–scale, dens...
BANMAC: an opportunistic MAC protocol for reliable communications in body area ...
Prabh, K. Shashi; Royo, Fernando; Tennina, Stefano; Olivares, TeresaWe consider reliable communications in Body Area Networks (BAN), where a set of nodes placed on human body are connected using wireless links. In order to keep the Specific Absorption Rate (SAR) as low as possible for health safety reasons, these networks operate in low transmit power regime, which however, is known to be error prone. It has been observed that the fluctuations of the Received Signal Strength (R...
Demo: automatic personal identification system for security in critical service...
Tennina, Stefano; Renzo, Marco Di; Pomante, Luigi; Alesii, Roberto; Santucci, Fortunato; Graziosi, FabioThe demonstration proposal moves from the capabilities of a wireless biometric badge [4], which integrates a localization and tracking service along with an automatic personal identification mechanism, to show how a full system architecture is devised to enable the control of physical accesses to restricted areas. The system leverages on the availability of a novel IEEE 802.15.4/Zigbee Cluster Tree network mode...
Poster: EMMON: a WSN system architecture and toolset for large-scale and dense ...
Tennina, Stefano; Bouroche, Mélanie; Santos, Manuel; Oliveira, Pedro; Gomes, Ricardo; Mirza, Farrukh; Ciriello, Vincenzo; Cahill, Vinny; Alves, MárioWireless sensor networks (WSNs) have attracted growing interest in the last decade as an infrastructure to support a diversity of ubiquitous computing and cyber-physical systems. However, most research work has focused on protocols or on specific applications. As a result, there remains a clear lack of effective and usable WSN system architectures that address both functional and non-functional requirements in ...