VI. DESIGN CHALLENGES OF WEARABLE SENSORS FOR
HUMAN ACTIVITY MONITORING
The research and scientific communities are working hard
to design and develop smart wearable devices to be used for
continuous monitoring of different human activities for twenty
four hours and seven days a week. There are several challenges
faced on design, development, fabrication, implementation
and utilization cum continuous monitoring. While designing
wearable devices there are always design challenges from
the hardware and software constraints arising from the formfactor,
light-weight and low energy operations, as well as there
are safety requirements such as avoidance of physical injury.
The physical impact of a sensor operation needs to be taken
into consideration and can be addressed by appropriate design
of multiple sensor components such as processor, radio, and
optimization of data algorithm. While the sensors are placed
on the body, the risk of thermal injury to tissue may also
be considered and can be reduced by limiting the sensing
frequency as well as wireless frequency, the computation
power, and the radio duty cycle of the body worn sensor.
A novel non-linear optimization framework has been presented
to consider safety and sustainability requirements that depend
on the human physiology and derive system level design
parameters for wearable sensors application [67]. In wireless