5,291 research outputs found
Cluster size entropy in the Axelrod model of social influence: small-world networks and mass media
We study the Axelrod's cultural adaptation model using the concept of cluster
size entropy, that gives information on the variability of the cultural
cluster size present in the system. Using networks of different topologies,
from regular to random, we find that the critical point of the well-known
nonequilibrium monocultural-multicultural (order-disorder) transition of the
Axelrod model is unambiguously given by the maximum of the
distributions. The width of the cluster entropy distributions can be used to
qualitatively determine whether the transition is first- or second-order. By
scaling the cluster entropy distributions we were able to obtain a relationship
between the critical cultural trait and the number of cultural
features in regular networks. We also analyze the effect of the mass media
(external field) on social systems within the Axelrod model in a square
network. We find a new partially ordered phase whose largest cultural cluster
is not aligned with the external field, in contrast with a recent suggestion
that this type of phase cannot be formed in regular networks. We draw a new
phase diagram for the Axelrod model in regular networks.Comment: 21 pages, 7 figure
Throughput and range characterization of IEEE 802.11ah
The most essential part of Internet of Things (IoT) infrastructure is the
wireless communication system that acts as a bridge for the delivery of data
and control messages. However, the existing wireless technologies lack the
ability to support a huge amount of data exchange from many battery driven
devices spread over a wide area. In order to support the IoT paradigm, the IEEE
802.11 standard committee is in process of introducing a new standard, called
IEEE 802.11ah. This is one of the most promising and appealing standards, which
aims to bridge the gap between traditional mobile networks and the demands of
the IoT. In this paper, we first discuss the main PHY and MAC layer amendments
proposed for IEEE 802.11ah. Furthermore, we investigate the operability of IEEE
802.11ah as a backhaul link to connect devices over a long range. Additionally,
we compare the aforementioned standard with previous notable IEEE 802.11
amendments (i.e. IEEE 802.11n and IEEE 802.11ac) in terms of throughput (with
and without frame aggregation) by utilizing the most robust modulation schemes.
The results show an improved performance of IEEE 802.11ah (in terms of power
received at long range while experiencing different packet error rates) as
compared to previous IEEE 802.11 standards.Comment: 7 pages, 6 figures, 5 table
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