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Allowing mobile users to find and access resources available in the surrounding environment opportunistically via their smart devices could enable them to create and use a rich set of services. Such services can go well beyond what is possible for a mobile phone acting alone. In essense, access to diverse resources such as raw computational power, social(More)
By using device-to-device communication, opportunistic networks promise to fill the gap left by infrastructure-based networks in remote areas, to support communication in disaster and emergency situations, as well as to enable new local social networking applications. Yet, to become feasible in practice and accepted by the users, it is crucial that(More)
The requirements on infrastructures for digital learning are changing as learners become more and more mobile. Ad hoc interactions, dynamically changing learning teams and communication and collaboration centered learning have to be considered. In contrast to traditional digital learning environments focused on simulation, content representation and(More)
Regular exercise is one of the most important factors in maintaining a good state of health. In the past, different systems have been proposed to assist people when exercising. While most of those systems focus only on cardio exercises such as running and cycling, we exploit smartphones to support leisure activities with a focus on resistance training. We(More)
Wireless Mesh Networks (WMNs) have gained increasing attention as an attractive means to provide con-nectivity in complement to access as offered by regular In-ternet Service Providers (ISPs). Such a grass-root technique, however, often suffers from detrimental operating conditions and poor quality. Network virtualization, on the other hand, has been widely(More)