@inproceedings{43a535939dc6453ca9ce3b298f425fac,
title = "Extracting personal user context with a three-axis sensor mounted on a freely carried cell phone",
abstract = "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[%].",
keywords = "Accelerometer, Cell phone, Context extraction, Kohonen self-organizing map, Sensors, Ubiquitous service, Wavelet packet",
author = "Toshiki Iso and Kenichi Yamazaki",
year = "2006",
month = dec,
day = "1",
language = "English",
isbn = "9728865643",
series = "SIGMAP 2006 - International Conference on Signal Processing and Multimedia Applications, Proceedings",
pages = "224--231",
booktitle = "SIGMAP 2006 - International Conference on Signal Processing and Multimedia Applications, Proceedings",
note = "International Conference on Signal Processing and Multimedia Applications, SIGMAP 2006 ; Conference date: 07-08-2006 Through 10-08-2006",
}