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Wireless Sensor Networks are popular and proven useful in various service areas. Energy optimization, processing optimization and storage optimization are the main challenges. While there is a debate for complete or partial data extraction from sensors, having special data process functions and operation primitives proves useful for sensor operating systems. To deal with robustness and reliability, data processing at the network/sensor level satisfies some of the reliability requirements, especially when communications are not operational. There are situations where data reduction is an alternative when storage is no longer available and data is accumulating, especially when some sensor links are not operational.
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