Frontiers of Engineering Reports on Leading-Edge Engineering from the 2001 NAE Symposium on Frontiers of Engineering (2002) / Chapter Skim
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Wireless Integrated Network Sensors (WINS): The Web Gets Physical
Wireless Integrated Network Sensors (WINS): The Web Gets Physical
Pages 78-84
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From page 78... ...
WINS combine sensor technology, signal processing, computation, and wireless networking capability in integrated systems. With advances in integrated circuit technology, sensors, radios, and processors can now be constructed at low cost and with low power consumption, enabling mass production of sophisticated compact systems that can link the physical world to networks (Asada et al., 1998; Bult et al., 1996; Dong et al., 1997; Lin et al., 1998~.
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From page 79... ...
The gateway may be a sensor node similar to other nodes in the cluster, or it may be entirely different, performing, for example, extra signal processing and communications tasks and having no sensors. In the cluster in the top left portion of Figure 1, nodes are connected by a multihop network, with redundant pathways to the gateway.
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From page 80... ...
This flexibility enables individuals at the lower levels to deal with local changes in the work situation much faster than if a central controller had to be consulted for each action; at the same time, global goals continue to be pursued. With machines of course, we can provide highly differentiated abilities to devices at different levels of the hierarchy.
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From page 81... ...
Because networked sensors have hitherto been very expensive, relatively little array data are available for most identification purposes, and sensors have typically been placed much farther from potential targets than they will be with WINS. This means, paradoxically, that initially fairly powerful nodes will have
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From page 82... ...
Sensoria Corporation's WINS NG 2.0, for example, nodes include ports for four sensors, a realtime digital signal processor, memory, a main processor running Linux, a battery and port for external power, the global positioning system (GPS) , Ethernet, an RS-232 port, and two radios for convenient synthesis of multihop networks.
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From page 83... ...
The high-level requirements for the design of the gateway are surprisingly similar to the requirements for the development nodes described in the first scenario for conducting large-scale data collection experiments. Common requirements include real-time components, general purpose processors, wired and wireless network communication interfaces, application program interfaces that permit construction of software by third parties, and remote controllability via the Web.
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From page 84... ...
Because of constrained communications, design considerations for scalable networks will be similar even if data rates and processing capabilities vary greatly. Signal processing and communications must be considered together for a very broad range of systems that interface to the physical world.
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