Carlos Manuel Rodrigues Machado Autonomic Ubiquitous Computing

the WC mirror light starts at 6 a.m., in the kitchen and in the Hall it starts about 6:30 a.m. and
ends around 7 a.m..
accumulated minutes
accumulated minutes
100
80
60
40
20
0
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24
hour of the day
WC Mirror Light
60
50
40
30
20
10
C
Living-room Light
0
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24
hour of the day
A
Light Accumulated Usage
accumulated minutes
accumulated minutes
80
60
40
20
Kitchen Light
0
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24
hour of the day
40
30
20
10
C
Hall Light
C
0
0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24
hour of the day
Figure 26 – Light accumulated usage with minute resolution (122 days period); Labels:
A- Living-Room (watching tv); B- Dinner; C- Get-up and go to work; D- Arriving home
from work;
The histograms shown below in
Figure 27 point out the usage intervals in which a light is switched-on by the inhabitants.
These histograms are very important to determine the moment it is probable to switch-off a light. It
is possible to see that 90% of the usage intervals for the WC mirror light has a duration of less that
1500s (25 minutes) and almost near 100% of the activities happen in less than 3600s (1 hour). In
the hall light usage, the percentile of 90% happens after an hour and the value near 100% only
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B
D