نتایج جستجو برای: frequency domain fd

تعداد نتایج: 863757  

2017
Maria J. Gonçalves Ana F. Mourão António Martinho Olívia Simões José Melo-Gomes Manuel Salgado Paula Estanqueiro Célia Ribeiro Iva Brito João E. Fonseca Helena Canhão

Fabry's disease (FD) is a lysosomal storage disorder associated with an alpha-galactosidase A deficiency. The prevalence of FD among juvenile idiopathic arthritis (JIA) patients with established diagnosis is unknown, but as musculoskeletal pain may be an important complaint at presentation, misdiagnosed cases are anticipated. With this study, we aim to calculate the frequency of FD-associated m...

Journal: :IEICE Transactions 2006
Gue Chol Kim Yoshiyuki Shimizu Bunsei Murakami Masaru Goto Keisuke Ueda Takao Kihara Toshimasa Matsuoka Kenji Taniguchi

A new small-signal model for fully depleted silicon-oninsulator (FD-SOI) MOSFETs operating at RF frequencies is presented. The model accounts for the non-quasi-static effect by determining model parameters using a curve fitting procedure to reproduce the frequency response of FD-SOI MOSFETs. The accuracy of the model is validated by comparison of S parameters with measured results in the range ...

2014
Yanfei Wang Wenquan Liang Zuhair Nashed Xiao Li Guanghe Liang Changchun Yang

The staggered-grid finite-difference (FD) method is widely used in numerical simulation of the wave equation. With stability conditions, grid dispersion often exists because of the discretization of the time and the spatial derivatives in thewave equation. Therefore, suppressing grid dispersion is a key problem for the staggered-grid FD schemes. To reduce the grid dispersion, the traditional me...

2003
Yong Wang Jae-Gon Kim Shih-Fu Chang

In this report we summarize our work on real time transcoding implementation combining frame dropping (FD) and DCT coefficient dropping (CD). FD can realize the temporal down sampling resulting in a low frame rate video stream, while CD is implemented by truncating the high frequency AC DCT coefficient bits. The video quality is optimized by adopting the Lagrange optimization. We also specify t...

Journal: :Journal of magnetic resonance 2003
Stefan Stoll Arthur Schweiger

In many Fourier-transform spectroscopies, such as pulse magnetic resonance (NMR, EPR), time-domain signals are acquired. Parameters are extracted from these signals by fitting numerical simulations to the experimental data. At present, simulations are often performed in frequency domain (FD). These computations generate a list of frequencies and amplitudes associated with the complex exponentia...

2004
Peter F. Craigmile Peter Guttorp Donald B. Percival

A common problem in the analysis of time series is how to deal with a possible trend component, which is usually thought of as large scale (or low frequency) variations or patterns in the series that might be best modeled separately from the rest of the series. Trend is often confounded with low frequency stochastic fluctuations, particularly in the case of models such as fractionally differenc...

Journal: :Technology in cancer research & treatment 2011
Guan Xu Daqing Piao Hamid Dehghani

This work investigates, by means of analytical and simulation studies, the performance of spectrally-constrained image reconstruction in Continuous-Wave or Direct-Current (DC) and Frequency Domain (FD) near-infrared optical tomography. A recent analytic approach for estimating the accuracy of target recovery and the level of background artifact for optical tomography at single wavelength, based...

2001
Vincenzo Galdi Leopold B. Felsen David A. Castañon

This paper deals with the short-pulse radiation of three-dimensional (3-D) vector electromagnetic fields from arbitrarily polarized large two-dimensional (2-D) truncated aperture distributions, which are parameterized in terms of narrow-waisted ray-like pulsed Gaussian basis beams centered on a discretized Gabor lattice in a four-dimensional (4-D) configuration-spectrum phase space. The study e...

2007
G Paltauf R Nuster M Haltmeier P Burgholzer

A method for photoacoustic tomography is presented that uses line integrals over the acoustic wave field from a photoacoustic source for the reconstruction of a three-dimensional image. The line integrals are acquired with an optical line sensor based on a Mach–Zehnder interferometer. Image reconstruction is a two-step process. In the first step data from a scan of the line outside the object a...

Journal: :J. Comput. Physics 2013
Jin-Hai Zhang Zhen-Xing Yao

Keywords: Optimized scheme Explicit finite-difference Numerical dispersion Maximum norm Simulated annealing algorithm a b s t r a c t Conventional explicit finite-difference methods have difficulties in handling high-frequency components due to strong numerical dispersions. One can reduce the numerical dispersions by optimizing the constant coefficients of the finite-difference operator. Differ...

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