Katharina Hahn

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In this paper we examine data dissemination in MANETs using various push and pull based protocols and a combination of both. We evaluate the protocols considering the load for each node and the resulting data freshness. Furthermore we introduce an adaptive pull protocol which enhances dissemination and saves up to 13% of the network load achieving the same(More)
With the emergence of wireless sensor networks, the issues of event recognition and processing have been partially shifted into the embedded domain. New processing capabilities on small devices allow for physically close event monitoring and fast filtering without having to set up a wired infrastructure beforehand. This opportunity for flexible deployments,(More)
With the encapsulation of functionality in services, many applications are nowadays built on composite Web-Services. Those are specified using workflow execution languages, such as BPEL, which represent the structure of the composition. However, they do not integrate transactional guarantees such as failure-atomicity. It is up to the application designer to(More)
The exchange of electronic information, goods or functionality is an attractive application for mobile ad-hoc networks. However, users will only take part in such systems, if the probability of a successful exchange is high enough. Exchanges may fail either because of communication failures or due to unfair behavior. Both obstacles need to be overcome to(More)
Applications deployed in mobile peer-to-peer systems have to cope with mobility and fluctuation of nodes. These dynamics restrict the reliability of communication links as well as the availability of certain nodes, services, and resources. Exploring the context of nodes can be used to anticipate these shortages. Context-awareness enables improvement of(More)
Service oriented computing provides suitable means to technically support distributed collaboration of heterogeneous devices such as in mobile environments. However, wireless communication links are unstable. When supporting collaboration in such environments, failures have to be optimistically coped with in order to still provide suitable correctness(More)
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