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UCAMI 2013
1. E-Flow: A communication system for user
notification in dynamic evacuation scenarios
Augusto Morales
Technical University of Madrid
UCAmI 2013
Picture by David Gordillo
Costa Rica · December 2-6
2. The Evacuation Problem
• The evacuation analysis is a long-studied
problem.
• There are Route modeling systems, decision
support systems, middlewares, WSN and so on.
• There are several gaps of current evacuation
plans regarding the way users perceive the
information and are aware of the situation
2
3. Building and evacuation plan including
the user perspective
• Nowadays, there many solutions that
indeed permit WSN environments to
provide information in evacuation
situations.
• Nevertheless, there are other
challenges , more related to the
human factor, such as:
– reducing the reaction time of
personnel,
– reducing the interpretation time,
– providing easy interaction mechanisms
and
– Providing dynamic signaling.
3
4. How to improve the chances
of survival from the user
perpective?
8. The BIG Picture of the E-Flow system
Proxy
MQTT
MQTT-to-Web Brokers
Faculty and
Students
XMPP
Servers
subscribe()
publish()
Local Network
Infraestructure
subscribe()
publish()
Wi-fi
Remote Networks
Mobile
Safety Staff
WSN
Wi-fi
Mobile
Broker
Pub/Sub
Client
Emergency
Response Teams
MQTT
Client
Concentrators 802.15
Sensors
18. Does the E-flow system provides acceptable
user awareness levels?
End-to-End
MQTT-to-Web using Websockets
Pub/Sub Network
MQTT only
Mean
Median
SD
Mean
Median
SD
a) Fixed
devices
30,977
29,770
1,056
4,740
4,515
0,904
b)
Mobile
devices
c) Proxy
Delay
246,983
250,989
11,893
65,904
66,938
4,111
4.402
4.520
0.830
-
-
-
We have checked the normality of the three samples with the Shapiro-Wilk normality test [23]
and conclude that the three samples came from a Normal distribution (p-value <= 0.05).
User experience and awareness are still acceptable for mobile cases. This
affirmation is based on the work of Jacob et al., which states that delays
less than 1.0 seconds need no special feedback.
23. E-Flow: A communication system for user
notification in dynamic evacuation scenarios
Augusto Morales
Technical University of Madrid
UCAmI 2013
Picture by David Gordillo
Costa Rica · December 2-6