title: Change-of-state determination to recognize mobility activities using a BlackBerry smartphone.
abstract: A Wearable Mobility Monitoring System (WMMS) can be a useful tool for rehabilitation decision-making. This paper presents preliminary design and evaluation of a WMMS proof-of-concept system. Software was developed for the BlackBerry 9550, using the integrated three axes accelerometer, GPS, video camera, and timer to identify mobility changes-of-state (CoS) between static activities, walking-related activities, taking an elevator, bathroom activities, working in the kitchen, and meal preparation (five able-bodied subjects). This pilot project provides insight into new algorithms and features that recognize CoS and activities in real-time. Following features extraction from the sensor data, two decision trees were used to distinguish the CoS and activities. Real-time CoS identification triggered BlackBerry video recording for improved mobility context analysis during post-processing.
authors.affiliation: Mechanical Engineering, University of Ottawa.
authors.forename: Hui Hsien
authors.initials: HH
authors.lastname: Wu
authors.forename: Edward D
authors.initials: ED
authors.lastname: Lemaire
authors.forename: Natalie
authors.initials: N
authors.lastname: Baddour
mesh_terms: D000054:Acceleration; D056044:Actigraphy / Q000295:instrumentation*; D040421:Cell Phone; D004867:Equipment Design; D019544:Equipment Failure Analysis; D040362:Geographic Information Systems / Q000295:instrumentation*; D006801:Humans; D018670:Monitoring, Ambulatory / Q000295:instrumentation*; D009043:Motor Activity / Q000502:physiology*; D015203:Reproducibility of Results; D012680:Sensitivity and Specificity; D012815:Signal Processing, Computer-Assisted / Q000295:instrumentation; D013018:Sound Spectrography / Q000295:instrumentation; D013686:Telemetry / Q000295:instrumentation*