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UNIVERSITY COLLEGE DUBLIN DUBLIN CITY UNIVERSITYSMI || NCSR || CDVP
Minimally Invasive Gathering of Body Context Information from Garment
Interactions
Lucy Dunne, Barry Smyth
Smart Media Institute, University College Dublin
Sarah Brady, Dermot Diamond
National Centre for Sensor Research, Dublin City
University
UNIVERSITY COLLEGE DUBLIN DUBLIN CITY UNIVERSITYSMI || NCSR || CDVP
Wearable Sensing
• Sensor-based user monitoring for Context awareness– Awareness of: user’s physiological state, environment, social setting– Reduces cognitive load of wearable technology– Minimizes necessary amount of integrated technology
• Garment Integration– Minimally invasive sensing (vs. standard body sensing technologies)– Minimizes degree of adaptation required by user– Maximizes user comfort (physical, social)
UNIVERSITY COLLEGE DUBLIN DUBLIN CITY UNIVERSITYSMI || NCSR || CDVP
Data Extraction from Garment Interactions
• Exploiting natural movements, garment features, and textile structures to obtain information– Detection of physical interactions between body and garment
• Using garment/textile as sensor– Intelligent textiles, monitoring of textile changes
• Minimizing foreign concepts/components– Eases user acceptance of innovation
UNIVERSITY COLLEGE DUBLIN DUBLIN CITY UNIVERSITYSMI || NCSR || CDVP
Pressure-Sensitive Foam
• Polyurethane foam, coated with conductive polypyrrole polymer
• Pressure results in detectable increase in conductance
• Soft, washable sensor
• Foam substrate allows detection of deformations of the structure: bends and compressive forces
• Does not rely on extension of fabric
UNIVERSITY COLLEGE DUBLIN DUBLIN CITY UNIVERSITYSMI || NCSR || CDVP
Garment Layout
Removable sensors/ circuits
2 layer garment: easy integration of
additional sensor
locations
UNIVERSITY COLLEGE DUBLIN DUBLIN CITY UNIVERSITYSMI || NCSR || CDVP
Breathing Monitor
Breathing
2.00E+03
3.00E+03
4.00E+03
0 200 400 600
Time (s)
Re
sis
tan
ce
(O
hm
s)
20% difference in relative resistance
UNIVERSITY COLLEGE DUBLIN DUBLIN CITY UNIVERSITYSMI || NCSR || CDVP
Shoulder Movement
Right Shoulder Lift
-5.00E+06
0.00E+00
5.00E+06
1.00E+07
0 100 200 300
Time (sec)
Re
sis
tan
ce
(O
hm
s)
100% difference in relative resistance
UNIVERSITY COLLEGE DUBLIN DUBLIN CITY UNIVERSITYSMI || NCSR || CDVP
Neck Movement/Posture
Neck Bends
-1.00E+06
0.00E+00
1.00E+06
2.00E+06
0 100 200 300 400 500
Time (s)
Re
sis
tan
ce
(o
hm
s)
Extension: 80% difference in relative resistance
Flexion: 30% difference in relative resistance
UNIVERSITY COLLEGE DUBLIN DUBLIN CITY UNIVERSITYSMI || NCSR || CDVP
Shoulder Blade Pressure
Shoulder Blade Pressure (lying down)
0.00E+00
5.00E+05
0 100 200 300
Time (s)
Re
sis
tan
ce
(o
hm
s)
60% difference in relative resistance
UNIVERSITY COLLEGE DUBLIN DUBLIN CITY UNIVERSITYSMI || NCSR || CDVP
Problems
• Sensor baseline drift: 26.6% of total resistance per minute, due to hysteresis in foam substrate (after 2 hr relax period resistance returns to “normal”)
• Sensor oxidation: gradual reduction in resistance over time due to oxidation of polymeric backbone
• Precision of sensor: presence of noise
UNIVERSITY COLLEGE DUBLIN DUBLIN CITY UNIVERSITYSMI || NCSR || CDVP
Future Directions
• Wireless sensor networks– Integration of pressure sensors into Mote networks
UNIVERSITY COLLEGE DUBLIN DUBLIN CITY UNIVERSITYSMI || NCSR || CDVP
Future Directions
• Activity monitoring– Coarse detection of arm position
UNIVERSITY COLLEGE DUBLIN DUBLIN CITY UNIVERSITYSMI || NCSR || CDVP
Future Directions
• Sensitive Sock for Neuropathy
UNIVERSITY COLLEGE DUBLIN DUBLIN CITY UNIVERSITYSMI || NCSR || CDVP
Future Directions
• Integration of additional sensor types– Contextual information from multiple sources– Agent-based collaboration between wireless sensor nodes– Determination of noise vs. signal
UNIVERSITY COLLEGE DUBLIN DUBLIN CITY UNIVERSITYSMI || NCSR || CDVP
Questions?
(the end)