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Human Activity Pattern Recognition from Accelerometry Data

  • Ambulant studies are dependent on the behavior and compliance of subjects in their home environment. Especially during interventions on the musculoskeletal system, monitoring physical activity is essential, even for research on nutritional, metabolic, or neuromuscular issues. To support an ambulant study at the German Aerospace Center (DLR), a pattern recognition system for human activity was developed. Everyday activi-ties of static (standing, sitting, lying) and dynamic nature (walking, ascending stairs, descending stairs, jogging) were under consideration. Two tri-axial accelerometers were attached to the hip and parallel to the tibia. Pattern characterizing features from the time domain (mean, standard deviation, absolute maximum) and the frequency domain (main frequencies, spectral entropy, autoregressive coefficients, signal magni-tude area) were extracted. Artificial neural networks (ANN) with a feedforward topology were trained with backpropagation as supervised learning algorithm. An evaluation of the resulting classifier was conducted with 14 subjects completing an activity protocol and a free chosen course of activities. An individual ANN was trained for each subject. Accuracies of 87,99 % and 71,23 % were approached in classifying the activity protocol and the free run, respectively. Reliabilities of 96,49 % and 76,77 % were measured. These performance parameters represent a working ambulant physical activity monitor-ing system.

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Metadaten
Author:Dennis Jos
URN:urn:nbn:de:bsz:840-opus-741
Document Type:Master's Thesis
Language:English
Year of Completion:2013
Publishing Institution:Hochschule Heilbronn
Release Date:2013/12/02
Tag:Activity recognition; accelerometer; ambulatory monitoring; artificial neural networks; supervised learning
GND Keyword:Anerkennung; Mensch; Tätigkeit
Faculty:Informatik / Medizinische Informatik
DDC classes:000 Allgemeines, Informatik, Informationswissenschaft / 000 Allgemeines, Wissenschaft / 004 Informatik
Access Right:Frei zugänglich
Licence (German):License LogoVeröffentlichungsvertrag für Publikationen mit Print on Demand