Instrumentation & Measurement Magazine 24-6 - 55

Fig. 10. FM24-NP100 output for: (a) Standing; (b) Walking and running.
Multi-person Activity
Most systems are able to detect activities of only one individual,
while in real environments several residents perform
different activities simultaneously. Multi-person HAR is therefore
a practical and important problem which is typically
solved today by machine learning, such as the work in [30]
which uses six ambient sensors with multi-label recurrent neural
networks (RNN) for recognizing multi-person activities.
The multi-label RNN involves multiple output layers where
each output layer is related to one person.
Conclusion
Human activity recognition can be used for many well-being
assessment applications such as fall detection, dementia prediction,
respiration monitoring, and cognitive assessment. In
this article, we briefly looked at sensor-based human activity
September 2021
References
[1] B. Najafi, K. Aminian, A. Paraschiv-Ionescu, F. Loew, C. J. Bula
and P. Robert, " Ambulatory system for human motion analysis
using a kinematic sensor: monitoring of daily physical activity in
IEEE Instrumentation & Measurement Magazine
55
recognition and then took a more detailed look at device-free
sensors and how they have been used by researchers for wellbeing
assessment. We also showed basic test results from our
experiments to recognize human activity with some of these
device free sensors. Given their low cost and ease of use, it is
expected that there will be more applications and wider deployment
of systems with device-free sensors for well-being
assessment in smart homes. Sensor fusion will further improve
the accuracy of such applications. Finally, we briefly
reviewed challenges that need to be considered in the data collection
and analysis process of a HAR system.

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