Tobias Kurze

Ubiquitous access to existing scientific data is one of the key enablers for rapid development and progress of empirical and without doubt, also non-empirical sciences. Management, in particular the long-term preservation of said data presents a major challenge. Universities, scientific and cultural organisations, international collaborations and p...

With the number of different cloud providers growing the importance for reliable and up-to-date performance data increases to make qualified decision on what providers to use to carry out different tasks. To cope with this issue, this paper proposes a framework usable for distributed and self-organized continuous benchmarking of hybrid and heteroge...

The Software as a Service (SaaS) methodology is a key paradigm of Cloud computing. In this paper, we focus on an interesting topic—to dynamically host services on existing production Grid infrastructures. In general, production Grids normally employ a Job-Submission-Execution (JSE) model with rigid access interfaces. In this paper, we implement the...

Cloud Federation is one concept to confront chal-lenges that still persist in Cloud Computing, such as vendor lock-in or compliance requirements. The lack of a standardized meaning for the term Cloud Federation has led to multiple conflicting definitions and an unclear prospect of its possible benefits. Taking a client-side perspective on federated...

Cloud storage services such as the Amazon Simple Storage Service (S3) are widely accepted and are reaching an ever-expanding range of customers. Especially services providing S3-compatible interfaces enjoy great popularity due to S3's simplistic, yet powerful approach to store and retrieve data via web protocols. While cloud storage services presen...

The advent of advanced virtualized IT infrastructures that can be provisioned as on-demand services, known as Infrastructure-as-a-Service (IaaS) Cloud Computing, has created new research challenges and opportunities. The capability to rapidly allocate and deallocate seemingly infinite amounts of system resources is a defining characteristic of this...

Zusammenfassung Das Paradigma des Cloud Computing ist in den vergangenen zwei Jahren mit eindrucksvoller Geschwindigkeit auf den ersten Platz der IT-Hitparade aufgestiegen. Rund um dynamische IT-Dienstleistungen hat sich im Internet ein lukratives Geschäft entwickelt. Neben kommerziellen Angeboten von öffentlich verfügbaren Dienstleistungen, die be...

This paper suggests a definition of the term Cloud Federation, a concept of service aggregation characterized by interoperability features, which addresses the economic problems of vendor lock-in and provider integration. Furthermore, it approaches challenges like performance and disaster-recovery through methods such as co-location and geographic...

Using cloud technologies, it is possible to provision HPC services on-demand. Customers of the service are able to provision virtual HPC systems in a self-service portal and deploy and execute their specific application without operator intervention. The business model foresees to only charge the amount of resources actually used. There remain open...

The Software as a Service (SaaS) methodology is a key paradigm of Cloud computing. In this paper, we focus on an interesting topic - to implement a Cloud computing functionality, the SaaS model, on existing production Grid infrastructures. In general, production Grids employ a Job-Submission-Execution (JSE) model with rigid access interfaces. In th...

Cyberinfrastructure offers a vision of advanced knowledge infrastructure for research and education It integrates diverse resources across geographically distributed resources and human communities. Cy-beraide is a service oriented architecture and abstraction framework that allows us to access cyberinfrastructure through Web 2.0 technologies, whic...