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To realize ubiquitous services such as presence services and health care services, we propose an algorithm to extract ”personal user context” such as user’s behavior; it processes information gathered by a three-axis accelerometer mounted on a cell phone. Our algorithm has two main functions; one is to extract feature vectors by analyzing sensor data in detail by wavelet packet decomposition. The other is to flexibly cluster personal user context by combining a self-organizing algorithm with Bayesian theory. A prototype that implements the algorithm is constructed. Experiments on the prototype show that the algorithm can identify personal user contexts such as walking, running, going up/down stairs, and walking fast with an accuracy of about 88[%].

EXTRACTING PERSONAL USER CONTEXT WITH A THREE-AXIS SENSOR MOUNTED ON A FREELY CARRIED CELL PHONE