Practical Model-Based Diagnosis with Qualitative Possibilistic Uncertainty

An approach to fault isolation that exploits vastly incomplete models is presented. It relies on separate descriptions of each component behavior, together with the links between them, which enables focusing of the reasoning to the relevant part of the system. As normal observations do not need explanation, the behavior of the components is limited to anomaly propagation. Diagnostic solutions are disorders (fault modes or abnormal signatures) that are consistent with the observations, as well as abductive explanations. An ordinal representation of uncertainty based on possibility theory provides a simple exception-tolerant description of the component behaviors. We can for instance distinguish between effects that are more or less certainly present (or absent) and effects that are more or less certainly present (or absent) when a given anomaly is present. A realistic example illustrates the benefits of this approach.Comment: Appears in Proceedings of the Eleventh Conference on Uncertainty in Artificial Intelligence (UAI1995

Invariance principle for the coverage rate of genomic physical mappings

We study some stochastic models of physical mapping of genomic sequences. Our starting point is a global construction of the process of the clones and of the process of the anchors which are used to map the sequence. This yields explicit formulas for the moments of the proportion occupied by the anchored clones, even in inhomogeneous models. This also allows to compare, in this respect, inhomogeneous models to homogeneous ones. Finally, for homogeneous models, we provide nonasymptotic bounds of the variance and we prove functional invariance results.Comment: 24 page

Impedance operator description of a meta--surface with electric and magnetic dipoles

A meta-surface made of a collection of nano-resonators characterized an electric dipole and a magnetic dipole was studied in the regime where the wavelength is large with respect to the size of the resonators. An effective description in terms of an impedance operator was derived.Comment: submitted to Mathematical Problems in Engineerin

Bringing Elites Sociology Back in European Integration Theories: A Case Study Based on Commissioners and Directors General

Founded on an analysis of biographies and carriers of top‐rank officials and members of the European Commission, this paper suggest that a lot of recent polemic within the EU Institutions (such as Verheugen controversy, Kinnock reform, etc.) are the expressions of the tensions originating from socio‐morphological transformations. To put it simply, the gap between the members and the officials of the Commission has never been so wide on this score. Commissioners seem to be gaining in political capitals to the detriment of a professional commitment in European politics, which implies for example a minimum degree of attendance in the political space of the EU or the accumulation of capitals relating to this space. Conversely, the top‐level officials increasingly appear to owe their positions to long‐term investment in institutions involving the production and, simultaneously, the accumulation of European capitals, a general tendency whereof the meaning is precisely questioned within the conjuncture of the Kinnock reform and more widely that of the political issues which characterised the mid 2000s. Beyond the conventional issue of the differentiation or de‐differentiation processes of the political and administrative elites, this approach enables to underline the unique relationship between these staff categories in the case of the EU and to point out, to a greater extent, an opposition between temporary and intermittent staff which seems to be a correct indicator of inequal objectivation process of the European institutions

Some control design experiments with HIFOO

A new MATLAB package called HIFOO was recently proposed for H-infinity fixed-order controller design. This document illustrates how some standard controller design examples can be solved with this software

Affordances and Safe Design of Assistance Wearable Virtual Environment of Gesture

Safety and reliability are the main issues for designing assistance wearable virtual environment of technical gesture in aerospace, or health application domains. That needs the integration in the same isomorphic engineering framework of human requirements, systems requirements and the rationale of their relation to the natural and artifactual environment.To explore coupling integration and design functional organization of support technical gesture systems, firstly ecological psychologyprovides usa heuristicconcept: the affordance. On the other hand mathematical theory of integrative physiology provides us scientific concepts: the stabilizing auto-association principle and functional interaction.After demonstrating the epistemological consistence of these concepts, we define an isomorphic framework to describe and model human systems integration dedicated to human in-the-loop system engineering.We present an experimental approach of safe design of assistance wearable virtual environment of gesture based in laboratory and parabolic flights. On the results, we discuss the relevance of our conceptual approach and the applications to future assistance of gesture wearable systems engineering

Barcelone : écrire la marge, traduire en marge

Barcelona was chosen as the key geographic centre of interest in this paper not for its own sake but because its social, architectural and mythical topography exemplifies perfectly the ambiguous or even paradoxical position of translation in relation to the "original" text and the "source" language: is its location marginal (commentary, digression or appendix) or is it "central" in the sense that it reveals the core or matrix of the text translated? Barcelona, with its obscure Raval (suburb) at its centre, as the Id in Freudian psychic topography, translates itself outwards in successive layers of repression and return of the repressed. Both Mandiargues and Mendoza show this very well in their respective novels. But also the linguistic dualities of Barcelona exhibit a particular in-betweenness of discourse regimes and status (prose and poetry, for example), similar to that of translation

Low-lying zeros of L-functions for Quaternion Algebras

The density conjecture of Katz and Sarnak predicts that, for natural families of L-functions, the distribution of zeros lying near the real axis is governed by a group of symmetry. In the case of the universal family of automorphic forms of bounded analytic conductor on a totally definite quaternion algebra, we determine the associated distribution for a restricted class of test functions. In particular it leads to non-trivial results on densities of non-vanishing at the central point.Comment: 28 pages. arXiv admin note: text overlap with arXiv:1810.0278

XTRA: The fast X-ray timing detector on XEUS

The Rossi X-ray Timing Explorer (RXTE) has demonstrated that the dynamical variation of the X-ray emission from accreting neutron stars and stellar mass black holes is a powerful probe of their strong gravitational fields. At the same time, the X-ray burst oscillations at the neutron star spin frequency have been used to set important constraints on the mass and radius of neutron stars, hence on the equation of state of their high density cores. The X-ray Evolving Universe Spectroscopy mission (XEUS), the potential follow-on mission to XMM-Newton, will have a mirror aperture more than ten times larger than the effective area of the RXTE proportional counter array (PCA). Combined with a small dedicated fast X-ray timing detector in the focal plane (XTRA: XEUS Timing for Relativistic Astrophysics), this collecting area will provide a leap in timing sensitivity by more than one order of magnitude over the PCA for bright sources, and will open a brand new window on faint X-ray sources, owing to the negligible detector background. The use of advanced Silicon drift chambers will further improve the energy resolution by a factor of ~6 over the PCA, so that spectroscopic diagnostics of the strong field region, such as the relativistically broadened Iron line, will become exploitable. By combining fast X-ray timing and spectroscopy, XTRA will thus provide the first real opportunity to test general relativity in the strong gravity field regime and to constrain with unprecedented accuracy the equation of state of matter at supranuclear density.Comment: To appear in X-Ray Timing 2003: Rossi and Beyond, ed. P. Kaaret, F. K. Lamb, & J. H. Swank (Melville, NY: American Institute of Physics). 8 pages, 10 figures, 1 in colo