1,393 research outputs found
Optimizing the computation of overriding
We introduce optimization techniques for reasoning in DLN---a recently
introduced family of nonmonotonic description logics whose characterizing
features appear well-suited to model the applicative examples naturally arising
in biomedical domains and semantic web access control policies. Such
optimizations are validated experimentally on large KBs with more than 30K
axioms. Speedups exceed 1 order of magnitude. For the first time, response
times compatible with real-time reasoning are obtained with nonmonotonic KBs of
this size
Just below the surface: developing knowledge management systems using the paradigm of the noetic prism
In this paper we examine how the principles embodied in the paradigm of the noetic prism can illuminate the construction of knowledge management systems. We draw on the formalism of the prism to examine three successful tools: frames, spreadsheets and databases, and show how their power and also their shortcomings arise from their domain representation, and how any organisational system based on integration of these tools and conversion between them is inevitably lossy. We suggest how a late-binding, hybrid knowledge based management system (KBMS) could be designed that draws on the lessons learnt from these tools, by maintaining noetica at an atomic level and storing the combinatory processes necessary to create higher level structure as the need arises. We outline the “just-below-the-surface” systems design, and describe its implementation in an enterprise-wide knowledge-based system that has all of the conventional office automation features
Paradoxes of rational agency and formal systems that verify their own soundness
We consider extensions of Peano arithmetic which include an assertibility
predicate. Any such system which is arithmetically sound effectively verifies
its own soundness. This leads to the resolution of a range of paradoxes
involving rational agents who are licensed to act under precisely defined
conditions.Comment: 10 page
A Labelling Framework for Probabilistic Argumentation
The combination of argumentation and probability paves the way to new
accounts of qualitative and quantitative uncertainty, thereby offering new
theoretical and applicative opportunities. Due to a variety of interests,
probabilistic argumentation is approached in the literature with different
frameworks, pertaining to structured and abstract argumentation, and with
respect to diverse types of uncertainty, in particular the uncertainty on the
credibility of the premises, the uncertainty about which arguments to consider,
and the uncertainty on the acceptance status of arguments or statements.
Towards a general framework for probabilistic argumentation, we investigate a
labelling-oriented framework encompassing a basic setting for rule-based
argumentation and its (semi-) abstract account, along with diverse types of
uncertainty. Our framework provides a systematic treatment of various kinds of
uncertainty and of their relationships and allows us to back or question
assertions from the literature
A C++11 implementation of arbitrary-rank tensors for high-performance computing
This article discusses an efficient implementation of tensors of arbitrary
rank by using some of the idioms introduced by the recently published C++ ISO
Standard (C++11). With the aims at providing a basic building block for
high-performance computing, a single Array class template is carefully crafted,
from which vectors, matrices, and even higher-order tensors can be created. An
expression template facility is also built around the array class template to
provide convenient mathematical syntax. As a result, by using templates, an
extra high-level layer is added to the C++ language when dealing with algebraic
objects and their operations, without compromising performance. The
implementation is tested running on both CPU and GPU.Comment: 21 pages, 6 figures, 1 tabl
Interoperability between Heterogeneous Federation Architectures: Illustration with SAML and WS-Federation
International audienceDigital identity management intra and inter information systems, and, service oriented architectures, are the roots of identity federation. This kind of security architectures aims at enabling information system interoperability. Existing architectures, however, do not consider interoperability of heterogeneous federation architectures, which rely on different federation protocols.In this paper, we try to initiate an in-depth reflection on this issue, through the comparison of two main federation architecture specifications: SAML and WS-Federation. We firstly propose an overall outline of identity federation. We furthermore address the issue of interoperability for federation architectures using a different federation protocol. Afterwards, we compare SAML and WS-Federation. Eventually, we define the ways of convergence, and therefore, of interoperability
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