Wireless sensor Networks (WSNs) are fostering pervasive healthcare applications, where people are remotely moni- tored, without the full time assistance of professional care- givers. A key enabling element is the poss...
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ISBN:
(纸本)9781450320276
Wireless sensor Networks (WSNs) are fostering pervasive healthcare applications, where people are remotely moni- tored, without the full time assistance of professional care- givers. A key enabling element is the possibility to locate people in indoor environments, especially in emergency situations. Framed within the WSN4QoL project, this paper proposes the use of a ray tracing model for network planning, to support eficient people localization and performance analysis. Preliminary results show accurate radio coverage estimations, with a minimal calibration efort.
We present the design of a reliable nurse call system based on wireless embedded devices and multi-hop protocols. Our work is motivated by the need for such system during annual summer camps for people with muscular d...
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ISBN:
(纸本)9781450320276
We present the design of a reliable nurse call system based on wireless embedded devices and multi-hop protocols. Our work is motivated by the need for such system during annual summer camps for people with muscular dystrophy and the lack of suitable alternative solutions. We describe how our prototype meets the reliability and real-time requirements of such system, and report on results from a two-week de- ployment during a camp with 13 afected boys in July 2013.
Out-of-band signaling provides a valuable support to the management of wireless sensor networks. Among other signals, sound has a propagation speed in air which is fast enough to be neglected in typical sensor network...
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ISBN:
(纸本)9781450320276
Out-of-band signaling provides a valuable support to the management of wireless sensor networks. Among other signals, sound has a propagation speed in air which is fast enough to be neglected in typical sensor network applications, and slow enough to be measured by means of lowcost embeddedsystems. An ultrasonic triggering mechanism has been recently developed for VirtualSense, an ultra-lowpower sensor node featuring a Java runtime environment. Ultrasonic triggers provide on-demand wakeup capabilities that can be exploited by routing nodes to be switched on whenever there is a packet to be routed towards the sink, while spending all the idle time in an ultra low power inactive state where even the radio module is turned off. In addition, the same hardware components can be used to perform pairwise distance measurements that can be exploited for localization. In this demonstration we show the possible use of VirtualSense ultrasonic wake-up modules as distance estimators.
For understanding human activities in urban public spaces, we have been developing a sensing platform for visualizing data derived from sensor devices in the spaces. the platform collects sensing data from sensor devi...
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ISBN:
(纸本)9781450320276
For understanding human activities in urban public spaces, we have been developing a sensing platform for visualizing data derived from sensor devices in the spaces. the platform collects sensing data from sensor devices installed in public spaces, and provide a simple communication interface to access the sensor data for client systems. In this demo abstract, we describe a working prototype of a sensor data streaming service for visualizing urban public spaces. the streaming data includes the number of pedestrians, pedestrianows, and sound pressures of the human activities in the sensing area. As an application of the streaming service, we will show a client system that visualizes the current pedestrianows in the sensing area with very little delay. the ows are visualized like a view of live camera without pedestrians'appearances. the system has a search interface to retrieve the sensing data in a past period and also visualizes them.
this poster presents the work done to monitor the structural health of a Rome B1 underground construction site through a battery-powered Wireless sensor Network (WSN). We il- lustrate the specific requirements and cha...
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ISBN:
(纸本)9781450320276
this poster presents the work done to monitor the structural health of a Rome B1 underground construction site through a battery-powered Wireless sensor Network (WSN). We il- lustrate the specific requirements and challenges of working with wireless sensors underground, and we describe the solutions adopted for obtaining a working WSN that provides a robust solution of on line monitoring. We conclude by presenting an assessment and testing of these solutions, along withthe design insights and the lessons we learned during this on-the-field experience.
Time series forecasting aims at improving energy eficiency in wireless sensor networks (WSNs) by reducing the amount of data trafic. One such technique has each node generate a model that predicts the sampled data. Wh...
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ISBN:
(纸本)9781450320276
Time series forecasting aims at improving energy eficiency in wireless sensor networks (WSNs) by reducing the amount of data trafic. One such technique has each node generate a model that predicts the sampled data. When the actual, sensed data deviates from the model, a new model is generated and transmitted to the sink. Reductions in application data trafic as high as two orders of magnitude can be achieved. However, our experience in applying such forecasting in a real world deployment shows that the actual lifetime improvement is significantly less due to networking overheads. the study reported here reveals that careful, coordinated network parameter tuning can leverage the reduced trafic of forecasting techniques to increase lifetime without compromising application performance.
We demonstrate the use of a novel cross layer protocol for routing in Underwater Acoustic sensor Networks (UASNs). Our protocol, named CARP [1] for Channel-Aware Routing Protocol, is able to dynamically adapt to chann...
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ISBN:
(纸本)9781450320276
We demonstrate the use of a novel cross layer protocol for routing in Underwater Acoustic sensor Networks (UASNs). Our protocol, named CARP [1] for Channel-Aware Routing Protocol, is able to dynamically adapt to channel dynamics and to the changes occurring in the network topology and link quality over time. CARP is implemented and tested using the Sapienza University Networking framework for underwater Simulation Emulation and real-life Testing (SUNSET) [2] in different network scenarios. Our demonstration shows that CARP is able to find the suitable routes and to deliver data to the sink node independently of prevailing packet error rates and of nodes/links addition and removal.
Modeling and simulation play important roles in engineering research and design. these techniques are especially helpful in the early phases where limited detail is available about the design and where design changes ...
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ISBN:
(纸本)9781450320276
Modeling and simulation play important roles in engineering research and design. these techniques are especially helpful in the early phases where limited detail is available about the design and where design changes are less costly. In addition, high-fidelity models can be employed at the later stages to complement testing. Models are also important research tools for understanding complex phenomena.
this poster describes the main features provided by the Sapienza University Networking framework for underwater Simulation Emulation and real-life Testing (SUNSET) [1]. Particularly, we focus on the innovations and im...
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ISBN:
(纸本)9781450320276
this poster describes the main features provided by the Sapienza University Networking framework for underwater Simulation Emulation and real-life Testing (SUNSET) [1]. Particularly, we focus on the innovations and improvements introduced in SUNSET v2 after several years of in field experimentation. All the results collected during the different sea trials (considering sea, fjord, lake and river scenarios) have shown how SUNSET represents a robust, reliable and flexible solutions for in field tests where a network of heterogeneous devices is considered, with different acoustic modems, sensing devices and underwater vehicles.
the wireless Bluetooth standard, generally used for short range point-to-point communication between mobile devices, can in principle connect any number of stations into a multi- hop network. For this purpose a "...
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ISBN:
(纸本)9781450320276
the wireless Bluetooth standard, generally used for short range point-to-point communication between mobile devices, can in principle connect any number of stations into a multi- hop network. For this purpose a "scatternet" must be built up, which is a collection of small overlapping "piconets". Bluetooth technology is basically well-suited to some types of wireless sensor networks, but such deployment has been been limited due to the dificulty in setting up and maintaining a scatternet. We demonstrate the SFX algorithm, an extension of the earlier SHAPER procedure. the SFX algorithm builds up a scatternet by a decentralized procedure withthe properties of self-organization, self-optimization, and self-healing. the procedure has been verified by deployment in a photovoltaic power plant.
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