3 research outputs found
Routing Diverse Evacuees with Cognitive Packets
This paper explores the idea of smart building evacuation when evacuees can
belong to different categories with respect to their ability to move and their
health conditions. This leads to new algorithms that use the Cognitive Packet
Network concept to tailor different quality of service needs to different
evacuees. These ideas are implemented in a simulated environment and evaluated
with regard to their effectiveness.Comment: 7 pages, 7 figure
Cloud Enabled Emergency Navigation Using Faster-than-real-time Simulation
State-of-the-art emergency navigation approaches are designed to evacuate
civilians during a disaster based on real-time decisions using a pre-defined
algorithm and live sensory data. Hence, casualties caused by the poor decisions
and guidance are only apparent at the end of the evacuation process and cannot
then be remedied. Previous research shows that the performance of routing
algorithms for evacuation purposes are sensitive to the initial distribution of
evacuees, the occupancy levels, the type of disaster and its as well its
locations. Thus an algorithm that performs well in one scenario may achieve bad
results in another scenario. This problem is especially serious in
heuristic-based routing algorithms for evacuees where results are affected by
the choice of certain parameters. Therefore, this paper proposes a
simulation-based evacuee routing algorithm that optimises evacuation by making
use of the high computational power of cloud servers. Rather than guiding
evacuees with a predetermined routing algorithm, a robust Cognitive Packet
Network based algorithm is first evaluated via a cloud-based simulator in a
faster-than-real-time manner, and any "simulated casualties" are then re-routed
using a variant of Dijkstra's algorithm to obtain new safe paths for them to
exits. This approach can be iterated as long as corrective action is still
possible.Comment: Submitted to PerNEM'15 for revie
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Performance improvement for mobile ad hoc cognitive packets network
This thesis was submitted for the award of Doctor of Philosophy and was awarded by Brunel University LondonIn this thesis, focusing on the quality of service (QoS) improvement using per-packet power control
algorithm in Ad Hoc Cognitive Packet Networks (AHCPN). A power control mechanism creates as a
network-assisted function of ad hoc cognitive packet-based routing and aims at reducing both energy
consumption in nodes and QoS requirements. The suggested models facilitate transmission power
adjustments while also taking into account the effects on network performance.
The thesis concentrate on three main contributions. Firstly, a power control algorithm, namely the
adaptive Distributed Power management algorithm (DISPOW) was adopted. Performance of DISPOW
was compared to existing mechanisms and the results showed 27, 13, 9, and 40 percent improvements
in terms of Delay, Throughput, Packet Loss, and Energy Consumption respectively.
Secondly, the DISPOW algorithm was enhanced, namely a Link Expiration Time Aware Distributed
Power management algorithm (LETPOW). This approach periodically checks connectivity, transmission
power, interference level, routing overhead and Node Mobility in AHCPN. The results show
that LETPOW algorithm improves the performance of system. Results show further improvement
from DISPOW by 30,25,30,42 percent in terms of delay, packet loss ratio , path lengths and energy
consumption respectively.
Finally,Hybrid Power Control Algorithm (HLPCA) has presented is a combination of Link Expiration
Time Aware Distributed Power management algorithm (LETPOW) and Load Power Control
Algorithm (LOADPOW); deal with cross-layer power control applied for transmitting information
across the various intermediate layers. LOADPOW emphasis on the concept of transmission Power,
Received Signal Strength Indication (RSSI), and the suitable distance between the receiver and the
sender. The proposed algorithm outperforms DISPOW and LETPOW by 31,15,35,34,44 percent in
terms of Delay, Throughput, Packet Loss,path length and Energy Consumption respectively. From
this work, it can be concluded that optimized power control algorithm applied to Ad-hoc cognitive
packet network results in significant improvement in terms of energy consumption and QoS