Dirk Thißen

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Although Cloud Computing promises to lower IT costs and increase users' productivity in everyday life, the unattractive aspect of this new technology is that the user no longer owns all the devices which process personal data. To lower scepticism, the project SensorCloud investigates techniques to understand and compensate these adoption barriers in a(More)
Due to the requirements of open service markets, the structure of networks and application systems is changing. To handle the evolving complex distributed systems, new concepts for an efficient management of such systems have to be developed. Focussing on the service level, examples for existing concepts are trading, to find services in a distributed(More)
In open service markets customers can choose between several providers offering similar services. To survive in the arising competition, service providers are compelled to satisfy their customers by not only offering services for a reasonable price but additionally deploy them in an efficient way regarding e.g. performance and availability. Because in a(More)
The IP Multimedia Subsystem (IMS) is becoming the de facto overlay network for enabling the delivery of multimedia services in converged networks. Because it is envisioned that the IMS will experience a considerable growth in the years to come, it is important to verify that the involved resources conforming an IMS deployment deliver the desired performance(More)
With a changing structure of networks and application systems due to the requirements of decentralised enterprises and open service markets, distributed systems with rapidly increasing complexity are evolving. New concepts for an efficient management of such systems have to be developed. Focussing on the service level, examples for existing concepts are(More)