Publications related to Ringing (signal)

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This thesis investigates Noisy Gradient Descent (NGD), an idealized version of Stochastic Gradient Descent in three different settings. While commonly understood as an undesirable artifact, we demonstrate that the noise in NGD can be harnessed to ensure convergence to equilibrium in multiagent games with limited feedback, as well as to guarantee generalization of the outputs of a learning scheme, and, that it can serve as an essential tool for generative modeling. We explore these benefits by progressively

High-order numerical solvers for conservation laws suer from Gibbs phenomenon close to discontinuities, leading to spurious oscillations and a detrimental effect on the solution accuracy. A possible strategy to reduce it comprises adding a suitable amount of artificial dissipation. Although several viscosity models have been proposed in the literature, their dependence on problem-dependent parameters often limits their performances. Motivated by the objective to construct a universal artificial viscosity me

Photon-counting sensors based on standard complementary metal-oxide-semiconductor single-photon avalanche diodes (SPADs) represent an emerging class of imagers that enable the counting and/or timing of single photons at zero readout noise (better than high ...

High-order numerical solvers for conservation laws suffer from Gibbs phenomenon close to discontinuities, leading to spurious oscillations and a detrimental effect on the solution accuracy. A possible strategy to reduce their amplitude aims to add a suitable amount of artificial viscosity. Several models are available in the literature, which rely on the identification of a shock sensor, adding dissipation when the solution regularity is lost. The dependence on problem-specific parameters limits their perfo

The RF power of a gyrotron with a triode type magnetron-injection-gun (MIG) can be directly controlled via the voltage applied between its anode and its cathode. Hence, the performance of this type of gyrotron relies directly on the possibilities offered b ...

Measurements and analysis of a radio-frequency planar antenna are presented for applications in inductively-coupled plasma processing. The network of inductive and capacitive elements exhibits high currents under resonance which are efficient for plasma ge ...

The coupling between an inductive source and the plasma determines the power transfer efficiency and the reflected impedance in the primary circuit. Usually, the plasma coupling is analysed by means of a transformer equivalent circuit, where the plasma ind ...

The performance of the Compact LinearCollider (CLIC) damping rings (DR) is likely to be limited by collective effects due to the unprecedented brilliance of the beams. Coating will be used in both electron (EDR) and positron damping rings (PDR) to suppress effects like electron cloud formation or ion instabilities. The impedance modeling of the chambers, necessary for the instabilities studies which will ensure safe operation under nominal conditions, must include the contribution from the coating materials

The beam coupling impedance of the CERN SPS is expected to be one of the limitations to an intensity upgrade of the LHC complex. In order to be able to reduce the SPS impedance, its main contributors need to be identified. An impedance model for the SPS has been gathered from theoretical calculations, electromagnetic simulations and bench measurements of single SPS elements. The current model accounts for the longitudinal and transverse impedance of the kickers, the horizontal and vertical electrostatic bea

The exact formalism from B. Zotter to compute beam coupling impedances has been fully developed only in the case of an infinitely long circular beam pipe. For other two dimensional geometries, some form factors are known only in the ultrarelativistic case and under certain assumptions of conductivity and frequency of the pipe material. We present here a new and exact formalism to compute the beam coupling impedances in the case of a collimator-like geometry where the jaws are made of two infinite plates of

A wide range of different image modalities can be found today in medical imaging. These modalities allow the physician to obtain a non-invasive view of the internal organs of the human body, such as the brain. All these three dimensional images are of extreme importance in several domains of medicine, for example, to detect pathologies, follow the evolution of these pathologies, prepare and realize surgical planning with, or without, the help of robot systems or for statistical studies. Among all the medica

We propose to design the reduction operator of an image pyramid so as to minimize the approximation error in the

l _{ p }

-sense (not restricted to the usual p=2), where p can take non-integer values. The underlying image model is specified using shift-invariant basis functions, such as B-splines. The solution is well-defined and determined by an iterative optimization algorithm based on digital filtering. Its convergence is accelerated by the use of first and second order derivatives. For p close to 1,

We propose a new algorithm to find the corpus callosum automatically from midsagittal brain MR (magnetic resonance) images using the statistical characteristics and shape information of the corpus callosum. We first extract regions satisfying the statistical characteristics (gray level distributions) of the corpus callosum that have relatively high intensity values. Then we try to find a region matching the shape information of the corpus callosum. In order to match the shape information, we propose a new d

Spurious responses, known as phantom and ghost responses, in NMR 2-dimensional J spectroscopy, can be removed by a 4-step sequence where the phase of the C refocusing pulse is cycled through O, 90, 180, 270 Deg while the receiver ref. phase is alternated. This phase-cycling sequence was applied to the 2-dimensional J spectrum of 13C in MeOH obtained by the proton flip technique; both the phantom and ghost multiplets were canceled. [on SciFinder (R)]

Ringing (signal)

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Noisy Gradient Descent in Machine Learning: generalization, games, and sampling

MATHICSE Technical Report: Controlling oscillations in high-order Discontinuous Galerkin schemes using artificial\ viscosity tuned by neural networks

Widefield High Frame Rate Single-Photon SPAD Imagers for SPIM-FCS

Controlling oscillations in high-order schemes using neural networks

Upgrade of a 30 kV/10 mA anode power supply for triode type gyrotron

Complex image method for RF antenna-plasma inductive coupling calculation in planar geometry. Part II: measurements on a resonant network

Complex image method for RF antenna-plasma inductive coupling calculation in planar geometry. Part I: basic concepts

ELECTROMAGNETIC CHARACTERIZATION OF MATERIALS FOR THE CLIC DAMPING RINGS

Update of the SPS Impedance Model

GENERALIZED FORM FACTORS FOR THE BEAM COUPLING IMPEDANCES IN A FLAT CHAMBER

Atlas-based segmentation and classification of magnetic resonance brain images

$ l _{ p } $ -Multiresolution Analysis: How to Reduce Ringing and Sparsify the Error

Automated Segmentation of the Corpus Callosum in Midsagittal Brain Magnetic Resonance Images

Suppression of artifacts in two-dimensional J spectroscopy