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)
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)
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)
The progressing complexity of distributed information systems causes an increasing use of object-oriented technologies. As a consequence today's standard architectures of distributed systems like CORBA include a basic trading service. The standard trader mediates service offers to clients' requests if their specified characteristics match exactly each(More)