This paper analyzes the energy consumption of ad hoc nodes using IEEE 802.11 interfaces. The objective is to provide theoretical limits for the lifetime gains achievable by different power-saving techniques proposed in the literature. We assume that the lifetime is the most important metric from the user point of view. Our evaluation takes into account the properties of the medium access protoc...

Bio-inspired routing protocols use the principle of swarm intelligence, which finds the optimal path to the destination in a distributed and autonomous way in dynamically changing environments; therefore, they can maximize the routing performance, reduce the control overhead, and recover a path failure quickly according to the change in the network topology. In this paper, we propose a bio-insp...

The 1000-fold capacity increase envisioned by dense 5G networks results also in a tremendous increase in the energy consumption of the whole network. Utilizing relays in combination with physical-layer network coding (PNC) has been proposed as an energy-efficient solution to this problem by creating several short-distance low-power transmissions and by reducing the transmission time. However, d...

Conservation of energy is one of the main challenges in designing a wireless sensor network (WSN). The reason is that these large scaled networks cannot be arranged, configured, or maintained manually. Thus, automated deployment and configuration are required. One important factor determining the total energy consumption is the network topology. This article evaluates the relation between the m...

The class of Wireless Mesh Networks (WMN) supports an ample set of applications including wireless community networks, radio access networks in rural or metropolitan areas, or wireless backbones for factory/process automation. Guaranteeing security is crucial for within these application scenarios. While contemporary wireless technologies such as the IEEE 802.16 or the IEEE 802.11s standard pro...

We are investigating how to provide intelligent, pervasive support of group of people within so-called “smart environments”. Our current main assumption, based on literature in psychology and organizational studies, is that a group performs some complex, routine task as a structured activity, that is, by following some protocols that allow its members to coordinate and share a common understand...

Metapragmatic representations of ‘accent’ in Irish English over a 400-year period are examined, identifying the phonological shibboleths that have remained in place as emblems of ‘Irishness’ over the whole period. A textual structure based on direct quotation is shown to have supported a brisk trade in commodified text-artifacts (joke-books, pamphlets, a web site) that present amusing anecdotes...

Recent years are seeing an increasing need for on-line monitoring of teams of cooperating agents, e.g., for visualization, or performance tracking. However, in monitoring deployed teams, we often cannot rely on the agents to always communicate their state to the monitoring system. This paper presents a non-intrusive approach to monitoring by overhearing, where the monitored team's state is infe...