13,335 research outputs found
Anisotropic Fast-Marching on cartesian grids using Lattice Basis Reduction
We introduce a modification of the Fast Marching Algorithm, which solves the
generalized eikonal equation associated to an arbitrary continuous riemannian
metric, on a two or three dimensional domain. The algorithm has a logarithmic
complexity in the maximum anisotropy ratio of the riemannian metric, which
allows to handle extreme anisotropies for a reduced numerical cost. We prove
the consistence of the algorithm, and illustrate its efficiency by numerical
experiments. The algorithm relies on the computation at each grid point of a
special system of coordinates: a reduced basis of the cartesian grid, with
respect to the symmetric positive definite matrix encoding the desired
anisotropy at this point.Comment: 28 pages, 12 figure
Quantitative Estimates on the Binding Energy for Hydrogen in Non-Relativistic QED. II. The spin case
The hydrogen binding energy in the Pauli-Fierz model with the spin Zeeman
term is determined up to the order alpha cube, where alpha denotes the
fine-structure constant
Noisy Channel-Output Feedback Capacity of the Linear Deterministic Interference Channel
In this paper, the capacity region of the two-user linear deterministic (LD)
interference channel with noisy output feedback (IC-NOF) is fully
characterized. This result allows the identification of several asymmetric
scenarios in which imple- menting channel-output feedback in only one of the
transmitter- receiver pairs is as beneficial as implementing it in both links,
in terms of achievable individual rate and sum-rate improvements w.r.t. the
case without feedback. In other scenarios, the use of channel-output feedback
in any of the transmitter-receiver pairs benefits only one of the two pairs in
terms of achievable individual rate improvements or simply, it turns out to be
useless, i.e., the capacity regions with and without feedback turn out to be
identical even in the full absence of noise in the feedback links.Comment: 5 pages, 9 figures, see proofs in V. Quintero, S. M. Perlaza, and
J.-M. Gorce, "Noisy channel-output feedback capacity of the linear
deterministic interference channel," INRIA, Tech. Rep. 456, Jan. 2015. This
was submitted and accepted in IEEE ITW 201
Precision and accuracy of fish length measurements obtained with two visual underwater methods
During the VITAL cruise in the Bay of Biscay in summer 2002, two devices for measuring the length of swimming fish were tested: 1) a mechanical crown that emitted a pair of parallel laser beams and that was mounted on the main camera and 2) an underwater auto-focus video camera. The precision and accuracy of these devices were compared and the various sources of measurement errors were estimated by repeatedly measuring fixed and mobile objects and live fish. It was found that fish mobility is the main source of error for these devices because they require that the objects to be measured are perpendicular to the field of vision. The best performance was obtained with the laser method where a video-replay of laser spots (projected on fish bodies) carrying real-time size information was used. The auto-focus system performed poorly because of a delay in obtaining focus and because of some technical problems
Vallega, Adalberto (1992) The Changing Waterfront in Coastal Area Management. Milano, Ocean Change Publications, 127 p. (ISBN 88-204-7270-4)
Blachut, Teodor J. et Burkhardt, Rudolf (1989): Historical Development of Photogrammetric Methods and Instruments. American Society for Photogrammetry and Remote Sensing, Falls Church (Virginia), x + 157 p., 84 fig., 8 tabl., 15 x 23 cm, 65 US pour les membres). ISBN 0-944426-11-5.
Karara, H. M., édit. (1989): Non-topographic Photogrammetry. 2e édition, American Society for Photogrammetry and Remote Sensing, Falls Church (Virginia), xxix + 445 p., 579 fig., 16 tabl., 22 x 28 cm, 140 US pour les membres). ISBN-0-944426-23-9.
Williams, Martin A.J., Dunkerley, David L., De Dekker, Patrick, Kershaw, A. Peter et Stokes, Tonia, 1993. Quaternary Environments. Edward Arnold, London, xiii + 329 p., 125 fig., 6 tabl., 19 × 24,5 cm, 29,95 $ US. ISBN 0-7131-6590-1.
Ruellan, Alain, et Dosso, Mireille (1993). Regards sur le sol. Collection « Universités francophones », Éditions Foucher-AUPELF, Paris, 192 p., 406 fig., 21 x 27 cm, 160 FF (100 FF dans les pays en voie de développement). ISBN 0993-3948.
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