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In the biodiversity world (BDW) project we have created a flexible and extensible Web services-based grid environment for biodiversity researchers to solve problems in biodiversity and analyse biodiversity patterns. In this environment, heterogeneous and globally distributed biodiversity-related resources such as data sets and analytical tools are made available to be accessed and assembled by users...
Web services have become an integral part of workflow orchestration in scientific applications and many tools used by scientists including Kepler, Taverna and Triana incorporate Web services. However orchestration of complex workflows that involve services that exploit standards like WS-Addressing or WS-Security are not easily managed by these tools. Most complex use cases that involve ldquoadd onrdquo...
At a high level of abstraction grid applications are commonly specified based on the workflow paradigm. We consider that for the wide acceptance of grid technology it is relevant that the user has the possibility to express requirements on quality of service (QoS) at workflow specification time. However, most of the existing workflow languages lack constructs for QoS specification, or provide only...
This work explores the challenges of embedding long-term preservation processes into existing video production workflows. The challenges are many: size of video data, bulk and parallel transfer into the archive, automation of the processes, elimination of human steps, automatic triggering of the preservation workflows, replication of content, automatic extraction of metadata, and most important mechanisms...
Over the last few years, grid technologies have progressed towards a service-oriented paradigm that enables a new way of service provisioning based on utility computing models. Users consume these services based on their QoS (quality of service) requirements. In such ldquopay-per-userdquo grids, workflow execution cost must be considered during scheduling based on users' QoS constraints. In this paper,...
Whereas a consensus has been reached on defining the set of workflow patterns for business process modeling languages, no such patterns exists for workflows applied to scientific computing on the Grid. By looking at different kinds of parallelism, in this paper we identify a set of workflow patterns related to parallel and pipelined execution. The paper presents how these patterns can be represented...
Workflow engines are powerful tools to implement data-intensive scientific applications exploiting parallel grid resources transparently. We discuss the advantages of implementing applications as workflows of services when dealing with large data sets. We show how the graph of services associated with data composition operators enable the description of complex data flows in a very compact format...
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