127,243 research outputs found
A Taxonomy of Workflow Management Systems for Grid Computing
With the advent of Grid and application technologies, scientists and
engineers are building more and more complex applications to manage and process
large data sets, and execute scientific experiments on distributed resources.
Such application scenarios require means for composing and executing complex
workflows. Therefore, many efforts have been made towards the development of
workflow management systems for Grid computing. In this paper, we propose a
taxonomy that characterizes and classifies various approaches for building and
executing workflows on Grids. We also survey several representative Grid
workflow systems developed by various projects world-wide to demonstrate the
comprehensiveness of the taxonomy. The taxonomy not only highlights the design
and engineering similarities and differences of state-of-the-art in Grid
workflow systems, but also identifies the areas that need further research.Comment: 29 pages, 15 figure
Assessment of Optimal Flexibility in Ensemble of Frequency Responsive Loads
Potential of electrical loads in providing grid ancillary services is often
limited due to the uncertainties associated with the load behavior. A knowledge
of the expected uncertainties with a load control program would invariably
yield to better informed control policies, opening up the possibility of
extracting the maximal load control potential without affecting grid
operations. In the context of frequency responsive load control, a
probabilistic uncertainty analysis framework is presented to quantify the
expected error between the target and actual load response, under uncertainties
in the load dynamics. A closed-form expression of an optimal demand
flexibility, minimizing the expected error in actual and committed flexibility,
is provided. Analytical results are validated through Monte Carlo simulations
of ensembles of electric water heaters.Comment: IEEE International Conference on Smart Grid Communication
- …