1,609 research outputs found
Loosening the notions of compliance and sub-behaviour in client/server systems
In the context of "session behaviors" for client/server systems, we propose a
weakening of the compliance and sub-behaviour relations where the bias toward
the client (whose "requests" must be satisfied) is pushed further with respect
to the usual definitions, by admitting that "not needed" output actions from
the server side can be "skipped" by the client. Both compliance and
sub-behaviour relations resulting from this weakening remain decidable, though
the proof of the duals-as-minima property for servers, on which the
decidability of the sub-behaviour relation relies, requires a tighter analysis
of client/server interactions.Comment: In Proceedings ICE 2014, arXiv:1410.701
A Calculus for Higher Spin Interactions
Higher spin theories can be efficiently described in terms of auxiliary
St\"uckelberg or projective space field multiplets. By considering how higher
spin models couple to scale, these approaches can be unified in a conformal
geometry/tractor calculus framework. We review these methods and apply them to
higher spin vertices to obtain a generating function for massless, massive and
partially massless three-point interactions.Comment: 24 pages, 3 figures, LaTex. References added, typos corrected. Final
version to appear in JHE
Using the Business Process Execution Language for Managing Scientific Processes
This paper describes the use of the Business Process Execution Language for Web Services
(BPEL4WS/BPEL) for managing scientific workflows. This work is result of our attempt to adopt Service Oriented
Architecture in order to perform Web services – based simulation of metal vapor lasers. Scientific workflows can
be more demanding in their requirements than business processes. In the context of addressing these
requirements, the features of the BPEL4WS specification are discussed, which is widely regarded as the de-facto
standard for orchestrating Web services for business workflows. A typical use case of calculation the electric field
potential and intensity distributions is discussed as an example of building a BPEL process to perform distributed
simulation constructed by loosely-coupled services
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A Uniform Programming Abstraction for Effecting Autonomic Adaptations onto Software Systems
Most general-purpose work towards autonomic or self-managing systems has emphasized the front end of the feedback control loop, with some also concerned with controlling the back end enactment of runtime adaptations but usually employing an effector technology peculiar to one type of target system. While completely generic 'one size fits all' effector technologies seem implausible, we propose a general-purpose programming model and interaction layer that abstracts away from the peculiarities of target-specific effectors, enabling a uniform approach to controlling and coordinating the low-level execution of reconfigurations, repairs, micro-reboots, etc
Recommended from our members
A Uniform Programming Abstraction for Effecting Autonomic Adaptations onto Software Systems
Most general-purpose work towards autonomic or self-managing systems has emphasized the front end of the feedback control loop, with some also concerned with controlling the back end enactment of runtime adaptations -- but usually employing an effector technology peculiar to one type of target system. While completely generic "one size fits all" effector technologies seem implausible, we propose a general purpose programming model and interaction layer that abstracts away from the peculiarities of target specific effectors,enabling a uniform approach to controlling and coordinating the low-level execution of reconfigurations, repairs,micro-reboots, etc
A component-based framework for certification of components in a cloud of HPC services
HPC Shelfis a proposal of a cloud computing platform to provide component-oriented services for High Performance Computing (HPC) applications. This paper presents a Verification-as-a-Service (VaaS) framework for component certification onHPC Shelf. Certification is aimed at providing higher confidence that components of parallel computing systems ofHPC Shelfbehave as expected according to one or more requirements expressed in their contracts. To this end, new abstractions are introduced, starting with certifier components. They are designed to inspect other components and verify them for different types of functional, non-functional and behavioral requirements. The certification framework is naturally based on parallel computing techniques to speed up verification tasks.NORTE-01-0145- FEDER-000037
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