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In-situ measurement of physical activity of human under free-living environment is important for assessing their exposure to the environment. Innovative sensing technology is needed to realize such measurement. This paper presents a wearable, multi-sensor integrated measurement system (IMS) for assessing physical activity. Detailed analysis and simulation were performed for the parametric design of...
This paper presents an energy-efficient method for data transmission through improved data compression, based on the Walsh transform. The research is motivated by the need for optimal service life of wireless sensor networks, where individual sensor nodes are constrained by limited energy resources. A method of dynamically scaling sensor signals utilizing Walsh functions for data compression is presented...
This paper presents the design and evaluation of a novel adaptive sampling algorithm for reducing energy consumption in data acquisition and communication subsystems of a wireless sensor node. The algorithm uses isochronous measurements of the frequency content of the signal as the basis for adaptively varying the sampling rate. This allows signal acquisition at the minimum rate without sacrificing...
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