Information Technology Reference
In-Depth Information
Local Analysis and
Local Analysis and
Data Monitoring on
the Internet
Fig. 1.3 A typical sensor network usage scenario
High price tag of communication - The amount of energy sensor nodes use for
communication is much higher than the amount they use for sensing and
computation. This means that techniques such as data compression and aggregation
are very important in sensor networks, and special routing techniques are necessary
to avoid placing too much of a routing burden on any single node in the network.
Ad hoc nature of sensor networks - Eventually, some nodes will run out of energy
and fall out of the network. The network must be made resilient to such events,
through bypassing dead nodes in the routing process. Similarly, if more nodes
are added to replenish the sensor network, they must be seamlessly integrated
without the need for operator intervention. These considerations firmly place
sensor networks in the wider context of ad hoc computer networks.
Applications of Sensor Networks
Sensor networks began their life as a DARPA project, which materialized in the form
of IUSS (Integrated Undersea Surveillance System) later deployed by US Navy in
submarine warfare (detection of hostile submarines) [ 2 ]. Today, sensor networks
have found applications in many diverse fields such as
Military applications - terrain scanning, imaging, surveillance
Medicine - remote monitoring of patients, especially the elderly; skin implants for
early detection of various illnesses and measurement of blood parameters, wearable
computing, swallowable capsules for video imaging of the inside of patient's body
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