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Fig. 17 Structure of a Personal health Assistant [56]<br />
The figure shows a potential implementation of a PHA: several sensors, distributed in clothes, transmit<br />
the measured physiological and context data over a body area network (BAN) to a computing unit,<br />
which fuses the sensor data out of them, estimates the health status and communicates with<br />
surrounding networks.<br />
Most of the products and technologies described in the three subsequent subchapters need sensors<br />
which either detect body movements or biometrical data like temperature or heartbeat for instance, or<br />
which fulfil the function of a switch. Hence, products mentioned in the following need wired and<br />
wireless communication and therefore require conductive yarns as well as conductive surfaces.<br />
Additionally, power generation could also be a part of the textile infrastructure, using the large area on<br />
the outer surface of clothes.<br />
Generally, the section wearable electronics can be subdivided according to its use into three groups,<br />
namely communication, information or entertainment, thermal control, and health, fitness or mood [58].<br />
2.1.4.1 Wearable electronics for communication, information or entertainment<br />
According to the International newsletter, wearable electronics for communication, information or<br />
entertainment can be defined as garments that use an electronically conductive textile structure as a<br />
scaffold for various switches, sensors, displays and other devices for communication, computing,<br />
information and/or entertainment.<br />
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