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Monthly Archives: February 2010

Programming with limited certainty

Sensor networks are all about uncertainty: if the sensor says it’s 20°C  out there, then it might be 20°C plus-or-minus half a degree or so (limited precision); or it might be some different temperature, and the sensor’s just reported a duff value for some reason (limited accuracy). By contrast, computers most definitely aren’t about uncertainty, a fact enshrined in the famous maxim “garbage in, garbage out”. What does this mean for our ability to build really large, robust and flexible sensor networks?

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