Sven Graupner

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Enterprises rely on IT services and their efficient management. Enterprises have a choice to produce their IT services in-house or source them from external service providers. In the latter case, business relationships must be managed with service providers, ranging from managing contracts, contacts, observing the delivery of service, receiving and paying(More)
Grid computing has relied on “best effort” as the guiding principal of operation. However, commercial grids need to provide much stricter guarantees. These guarantees have to be specified in terms of service level agreements and have to be monitored and assured. We propose an architecture for specifying and monitoring service level agreements to achieve the(More)
The concept of Grid, based on coordinated resource sharing and problem solving in dynamic, multiinstitutional virtual organizations, is emerging as the new paradigm in distributed and pervasive computing for scientific as well as commercial applications. We assume a global network of data centers housing an aggregation of computing, networking and storage(More)
Peer-to-peer computing (P2P) draws growing interest as a new distributed computing paradigm for its potential to harness “edge” computers (e.g., PCs) and make their under-utilized resources available to each other. P2P based e-commerce on the Internet is of particular interest because of P2P’s cost effectiveness and redundancy-induced dependability. Beneath(More)
The “Grid” has become the next incarnation of the utility computing vision: seamless access to data and services anytime, anywhere. Sharing a utility infrastructure requires high standards of security. Grid platforms such as the Globus Toolkit, the Grid Engine, Platform or the forthcoming Open Grid Services Architecture (OGSA) include various security(More)
With application systems increasingly built around the services-centric model, management of these eventually large distributed systems of interacting services is a challenge. In contrast to traditional application environments and their related management systems, management of distributed services systems will not have central control and is inherently(More)
Best-practice frameworks provide guidance for organizing work in business. They enable reuse of experience within a domain. However, best practice frameworks are general and usually cover broad domains. Their guidance thus is often offered at an abstract level rather than as details of actionable tasks and processes to accomplish work. This paper presents(More)
We target the problem of predicting resource usage in situations where the modeling data is scarce, non-stationary, or expensive to obtain. This scenario occurs frequently in computing systems and networks, mostly due to the high dynamicity of the underlying processes. Utility computing environments are an important example for such a scenario, as their(More)