60,703 research outputs found
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Towards an aspect weaving BPEL engine
This position paper proposes the use of dynamic aspects and
the visitor design pattern to obtain a highly configurable and
extensible BPEL engine. Using these two techniques, the
core of this infrastructural software can be customised to
meet new requirements and add features such as debugging,
execution monitoring, or changing to another Web Service
selection policy. Additionally, it can easily be extended to
cope with customer-specific BPEL extensions. We propose
the use of dynamic aspects not only on the engine itself
but also on the workflow in order to tackle the problems of
Web Service hot deployment and hot fixes to long running
processes. In this way, composing aWeb Service "on-the-fly"
means weaving its choreography interface into the workflow
A Type-Safe Model of Adaptive Object Groups
Services are autonomous, self-describing, technology-neutral software units
that can be described, published, discovered, and composed into software
applications at runtime. Designing software services and composing services in
order to form applications or composite services requires abstractions beyond
those found in typical object-oriented programming languages. This paper
explores service-oriented abstractions such as service adaptation, discovery,
and querying in an object-oriented setting. We develop a formal model of
adaptive object-oriented groups which offer services to their environment.
These groups fit directly into the object-oriented paradigm in the sense that
they can be dynamically created, they have an identity, and they can receive
method calls. In contrast to objects, groups are not used for structuring code.
A group exports its services through interfaces and relies on objects to
implement these services. Objects may join or leave different groups. Groups
may dynamically export new interfaces, they support service discovery, and they
can be queried at runtime for the interfaces they support. We define an
operational semantics and a static type system for this model of adaptive
object groups, and show that well-typed programs do not cause
method-not-understood errors at runtime.Comment: In Proceedings FOCLASA 2012, arXiv:1208.432
Towards homeostatic architecture: simulation of the generative process of a termite mound construction
This report sets out to the theme of the generation of a ‘living’,
homeostatic and self-organizing architectural structure. The main research
question this project addresses is what innovative techniques of design,
construction and materials could prospectively be developed and eventually
applied to create and sustain human-made buildings which are mostly
adaptive, self-controlled and self-functioning, without option to a vast supply
of materials and peripheral services. The hypothesis is that through the
implementation of the biological building behaviour of termites, in terms of
collective construction mechanisms that are based on environmental stimuli,
we could achieve a simulation of the generative process of their adaptive
structures, capable to inform in many ways human construction. The essay
explicates the development of the 3-dimensional, agent-based simulation of
the termite collective construction and analyzes the results, which involve
besides physical modelling of the evolved structures. It finally elucidates the
potential of this emerging and adaptive architectural performance to be
translated to human practice and thus enlighten new ecological engineering
and design methodologies
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Application of Advanced Early Warning Systems with Adaptive Protection
This project developed and field-tested two methods of Adaptive Protection systems utilizing synchrophasor data. One method detects conditions of system stress that can lead to unintended relay operation, and initiates a supervisory signal to modify relay response in real time to avoid false trips. The second method detects the possibility of false trips of impedance relays as stable system swings “encroach” on the relays’ impedance zones, and produces an early warning so that relay engineers can re-evaluate relay settings. In addition, real-time synchrophasor data produced by this project was used to develop advanced visualization techniques for display of synchrophasor data to utility operators and engineers
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