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Clock synchronization is an important feature in Wireless Sensor Networks, as a common vision of time can be required in order to perform synchronous operations. In this paper we present a new version of the Dynamic Continuous Clock Synchronization protocol which offers a greater robustness and requires less power than the original protocol. The role of the Reference Node which sends periodic snapshots...
Application of wireless technologies in Industrial communication claims for timely data delivery, since many applications are based on processes with real-time constraints. Currently, the 802.11B is the most used wireless protocol in the industrial applications area but it is not the ideal solution owing to the contention for medium access which can cause unbounded delays. In this paper the authors...
Performance evaluation via simulation requires to create models that are often difficult and are not able to faithfully reflect the operating conditions. This paper discusses an approach based on the integration of trace files into an OMNeT + + model. This approach allows to represent and evaluate complex systems by simple models. Moreover, in the case a simulation model of the communication system...
Gesture recognition has been extensively investigated and has traditionally been accomplished by methods based on computer vision. In this paper we present an hand gesture recognition system which is of general use and can be used for different applications. The system is based on a MEMS accelerometer and it is able to recognise several gestures which have been previously recorded into a suitable...
In this paper we compare three clock synchronization protocols for Wireless Sensor Networks and evaluate their performances under different operating conditions. The ??Dynamic Continuous Clock Synchronization?? (DCCS), here is compared with the ??Reference Broadcast Synchronization?? (RBS) and the ??Continuous Clock Synchronization?? (CCS). The performance evaluation of the three protocols has been...
In this paper we focus on the problems related to the management of a farm made up of several greenhouses. Management of this kind of farms requires data acquisition in each greenhouse and their transfer to a control unit which is usually located in a control room, separated from the production area. At present, data transfer between the greenhouses and the control system is mainly provided by a suitable...
This paper addresses the performance evaluation of a full duplex wireless protocol for an industrial backbone making a comparison with the traditional IEEE802.11 half duplex protocol. A Petri net model is used as the basis for the evaluation. The paper first examines the features of a wireless backbone and some issues they impose. Then, the paper describes the limits of the 802.11 and the solution...
Clock synchronization is an important service in wireless sensor networks (WSN) since it can be used for data integration, for the implementation of TDMA based approaches or for synchronous data acquisition. One main issue in WSN concerns the power consumption since the batteries have a limited capacity an often they cannot be replaced. In this paper we present a dynamic continuous clock synchronization...
In their professional activities, engineers have to face problems which require multidisciplinary skills. Therefore, it is very important for students in engineering courses, to understand that the various topics they have studied, all together constitute a cultural background to pick up from in complex problem resolution. For this reason, developing the ability to correlate what they have learned...
The interactions between controls units and users in Domotics applications constitute a critical aspect which has greatly limited the diffusion of home automation systems. Usually, ordinary people have not familiarity with automation systems and find difficult to use their control interface. In this paper the authors exploit the interactive and representative potentialities provided in synergy by...
In this paper we describe the architecture and implementation of a virtual lab designed to show the effect of the network delay on a distributed network-based control system. In particular, we focus on electric motor actuators which represent one of the most time-critical devices in the process control area. The virtual lab allows the user to send commands to the motors through several communication...
Handoff is defined as the phase during which a mobile node has a temporary connection loss during the transfer from one wireless communication cell to another one. As in industrial applications wireless networks are often used to connect mobile devices such as, robot, trolleys, conveyors, to a control station, handoff introduces a temporary interruption of monitoring and control of the mobile device...
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