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Despite recent advances in many real-time and workflow management systems (WFMS), event-handling is still a manual or semi-automated task. The integration of automated event processing with workflows remains an open research challenge to both academic and industrial communities. In this work, we propose a concrete approach that logs interactions between workflow component activities in the form of...
Collaborative applications require understanding of the theoretical foundations. In case of workflow systems, one possibility to achieve this is an accurate description of workflow functionalities. Despite its growing popularity and success, it has not yet been evaluated whether Language of Temporal Ordering Specification (LOTOS) is actually suitable for representing comprehensive workflow functionality...
While the cloud computing paradigm provides the technological foundation for previously unmatched efficiency in information systems, its economic implications are complex and significant. Bringing the benefits of this state-of-the-art technology to corporate datacenters requires a systematic cost analysis of current best-practice in conjunction with the new possibilities. We address this challenge...
In many areas such as e-commerce, mission-critical N-tier applications have grown increasingly complex. They are characterized by non-stationary workloads (e.g., peak load several times the sustained load) and complex dependencies among the component servers. We have studied N-tier applications through a large number of experiments using the RUBiS and RUBBoS benchmarks. We apply statistical methods...
Economical configuration planning, component performance evaluation, and analysis of bottleneck phenomena in N-tier applications are serious challenges due to design requirements such as non-stationary workloads, complex non-modular relationships, and global consistency management when replicating database servers, for instance. We have conducted an extensive experimental evaluation of N-tier applications,...
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