A wireless sensor network (WSN) is a distributed measurement system deployed over a geographical area to acquire physical information which, depending on the nature of the monitoring phenomenon, can be spatially corre...
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ISBN:
(纸本)9781424438198
A wireless sensor network (WSN) is a distributed measurement system deployed over a geographical area to acquire physical information which, depending on the nature of the monitoring phenomenon, can be spatially correlated in space and time. Spatial correlation, to be intended here at different levels, can be exploited to reduce the communication bandwidth, implement articulated sensing and carry out energy saving policies. The paper aims at investigating unsupervised feature selection algorithms and how they can be used to exploit spatial correlation in WSNs. The interest is due to the fact that generation of a reduced set of features (i.e., aggregated data) has a positive effect on optimal energy management, hierarchical decision making and performance. Six algorithms have been critically discussed and contrasted both at theoretical and experimental levels.
This paper designs a distributed monitoring system applied in the :motor vehicle detecting field. A detailed introduction to designing of the IP sensor access module are presented, and then the author focuses on the r...
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ISBN:
(纸本)1424411351
This paper designs a distributed monitoring system applied in the :motor vehicle detecting field. A detailed introduction to designing of the IP sensor access module are presented, and then the author focuses on the realization of all functions of the monitor system, which has been put into use with reliable and stable working results.
In a service oriented architecture requestors should be able to use the services that best fit their needs. In particular, for Web services it should be possible to fully exploit the advantages of dynamic binding. Up ...
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ISBN:
(纸本)0780389719
In a service oriented architecture requestors should be able to use the services that best fit their needs. In particular, for Web services it should be possible to fully exploit the advantages of dynamic binding. Up to now, no proposed solution allows the requesting agent to dynamically select the most "convenient" service at invoke time. The reason is that currently the requesting agents do not compare the runtime behavior of different services. In this paper, we propose a system that provides and exploits predictions about the behavior of Web services, expressed in terms of availability, reliability and completion time. We also describe a first prototype (eUDDIr) of the specification. EUDDIr relies on a scalable agents-based monitoring architecture that collects data on Web services runtime activity. The computed predictions are used by requesting agents to implement an effective dynamic service selection. Our proposal is well suited whenever requestors do not wish to explicitly deal with QoS aspects, or in the case that provider agents have no convenience in building up the infrastructure for guaranteed QoS, at the same time aiming to provide services of good quality to their customers. Furthermore, the adoption of eUDDIr effectively improves the service requestors "satisfaction" when they are involved in a Web services composition process.
Based on the discussion of bluetooth and network technology, this paper proposed an entire framework of a wireless distributed monitoring system by combining the characteristics of industry application. The feasibilit...
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Based on the discussion of bluetooth and network technology, this paper proposed an entire framework of a wireless distributed monitoring system by combining the characteristics of industry application. The feasibility of putting this kind of system in practice is discussed. The wireless distributed monitoring system can enhance the performance of condition monitoring more than the traditional one used now.
A hierarchical and distributed performance monitoring tool for a rapid prototyping system for distributed algorithms is presented. The monitoringsystem consists of a hierarchy of monitoring units distributed over the...
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A hierarchical and distributed performance monitoring tool for a rapid prototyping system for distributed algorithms is presented. The monitoringsystem consists of a hierarchy of monitoring units distributed over the processor nodes. The units are partitioned into several conditionally independent groups, each of which has a group leader unit. monitoring data are recorded by each individual unit and are collected and processed by the group leaders. The global picture of program behaviour is formed by the top-level unit of the hierarchy, resulting from a sequence of integrations of lower-level, partially processed data. This distributed, hierarchical nature of the monitoringsystem architecture offers substantial improvements in the efficiency of processing monitoring data. Furthermore, the architecture lends itself to a parallel implementation. Extensive experiments have been undertaken to make a comparison in performance between the proposed monitoringsystem architecture on different network topologies and a conventional, centralised monitoringsystem. Results show that the distributed monitoring system is scalable and that there is a significant performance improvement compared with a centralised system.
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