55 research outputs found
Wavenumber-explicit continuity and coercivity estimates in acoustic scattering by planar screens
We study the classical first-kind boundary integral equation reformulations
of time-harmonic acoustic scattering by planar sound-soft (Dirichlet) and
sound-hard (Neumann) screens. We prove continuity and coercivity of the
relevant boundary integral operators (the acoustic single-layer and
hypersingular operators respectively) in appropriate fractional Sobolev spaces,
with wavenumber-explicit bounds on the continuity and coercivity constants. Our
analysis is based on spectral representations for the boundary integral
operators, and builds on results of Ha-Duong (Jpn J Ind Appl Math 7:489--513
(1990) and Integr Equat Oper Th 15:427--453 (1992)).Comment: v2 has minor corrections compared to v1. arXiv admin note:
substantial text overlap with arXiv:1401.280
Irrelevancy due to visual tracking errors
A concept for reducing irrelevancy in unblurred motion images is introduced. It exploits the fact that the observer's eye cannot follow moving objects perfectly. Models of visual tracking and visual discrimination are developed and combined for data compression purposes
A Finite Difference Method with Optimized Dispersion Correction for the Helmholtz Equation
International audienc
Fernseh-Bildguete bei dynamischem Blickverhalten Abschlussbericht
SIGLEAvailable from TIB Hannover: F96B904+a / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekBundesministerium fuer Bildung, Wissenschaft, Forschung und Technologie, Bonn (Germany)DEGerman
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