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—In this paper, we analyze the coexistence of a primary and a secondary (cognitive) network when both networks use the IEEE 802.11 based distributed coordination function for medium access control. Specifically, we consider the problem of channel capture by a secondary network that uses spectrum sensing to determine the availability of the channel, and its(More)
The freedom of movement and enhanced features provided by wireless connectivity is stimulating interest in IEEE 802.11 as an enterprise-deployable technology. Before wireless communication can become a widespread reality, however, the industry must first address ease-of-use, configuration, management and security issues. This paper addresses these wireless(More)
Context awareness enables services and applications to adapt their behaviour to the current situation for the benefit of their users. It is considered as a key technology within the IT industry, for its potential to provide a significant competitive advantage to services providers and to give subtantial differentiation among existing services. Automated(More)
Semantic technologies are often proposed as important components of complex , cross-jurisdictional, heterogeneous, dynamic information systems. The needs and opportunities arising from the rapidly growing capabilities of networked sensing devices are a challenging case. It is estimated that today there are 4 billion mobile devices that can act as sensors,(More)
—This paper addresses the problem of coordinating great numbers of vehicles in large geographical areas under network connective constraints. We leverage previous work on hierarchical potential fields to create advanced skills in multi-robot systems. Skills group together various field objectives to accomplish the performance requirements in response to(More)