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The authors explore various applications that can be enabled by transforming mobile devices into active sonar systems—specifically showing how to monitor minute body movements such as breathing.

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IEEE Pervasive Computing

IEEE Pervasive Computing explores the role of computing in the physical world–as characterized by visions such as the Internet of Things and Ubiquitous Computing. Designed for researchers, practitioners, and educators, this publication acts as a catalyst for realizing the ideas described by Mark Weiser in 1988.