Results 71 to 80 of about 1,515,695 (366)

Classification and redshift estimation by principal component analysis [PDF]

, 2002
We show that the first 10 eigencomponents of the Karhunen-Lo\`eve expansion or Principal Component Analysis (PCA) provide a robust classification scheme for the identification of stars, galaxies and quasi-stellar objects from multi-band photometry.
Bagoly, Bahcall, Bailer-Jones, Binggeli, Bolzonella, Boyle, Britt, Bromley, Bruzual, Budavári, Budavári, Cabanac, Coleman, Connolly, Connolly, Connolly, Deeming, Dultzin-Hacyan, Fioc, Francis, Glazebrook, Heyer, Heyl, Hickson, Hickson, Hickson, Ibata, Kennicutt, Lilly, Lilly, Lin, Loveday, Marinoni, Marzke, Marzke, Massey, Metcalfe, Miller, Mittaz, Pickles, Rana, Roche, Ronen, Salpeter, Sawicki, Scarfe, Schechter, Shectman, Singh, Storrie-Lombardi, Takeuchi, Teuber, Turler, Vanden Berk, Watanabe, Whitney, Whitney, Zheng   +57 more
core   +2 more sources

Bounds on Portfolio Quality [PDF]

, 2014
The signal-noise ratio of a portfolio of p assets, its expected return divided by its risk, is couched as an estimation problem on the sphere. When the portfolio is built using noisy data, the expected value of the signal-noise ratio is bounded from ...
Pav, Steven E.
core  

Information content in Gaussian noise: optimal compression rates [PDF]

, 1999
We approach the theoretical problem of compressing a signal dominated by Gaussian noise. We present expressions for the compression ratio which can be reached, under the light of Shannon's noiseless coding theorem, for a linearly quantized stochastic ...
Barriga, Jose, Elizalde, Emilio, Gaztanaga, Enrique, Romeo, August   +3 more
core   +3 more sources

Gravitational waves from eccentric compact binaries: Reduction in signal-to-noise ratio due to nonoptimal signal processing [PDF]

, 1999
Inspiraling compact binaries have been identified as one of the most promising sources of gravitational waves for interferometric detectors. Most of these binaries are expected to have circularized by the time their gravitational waves enter the ...
A. Gopakumar, B. F. Schutz, B.J. Owen, B.J. Owen, B.S. Sathyaprakash, B.S. Sathyaprakash, C. Cutler, E. Poisson, E.E. Flanagan, E.E. Flanagan, Eric Poisson, G.B. Cook, G.D. Quinlan, H. Wahlquist, J.K. Blackburn, K. S. Thorne, Karl Martel, L. A. Wainstein, L. Blanchet, L.E. Kidder, P.C. Peters, R. Balasubramanian, R. Balasubramanian, R. Balasubramanian, S. Droz, S. Droz, S.L. Shapiro, S.V. Dhurandhar, T. Damour, T.A. Apostolatos, T.A. Apostolatos, W.H. Press   +31 more
core   +2 more sources

Signal-to-noise ratio of the MEG signal after preprocessing [PDF]

, 2014
Background Magnetoencephalography (MEG) provides a direct measure of brain activity with high combined spatiotemporal resolution. Preprocessing is necessary to reduce contributions from environmental interference and biological noise. New method The
Aurtenetxe, Sara, González Moreno, Alicia, López García, María Eugenia, Maestú, Fernando, Nevado, Angel, Pozo Guerrero, Francisco del   +5 more
core   +2 more sources

Signal to noise ratio analysis in virtual source array imaging [PDF]

, 2013
We consider correlation-based imaging of a reflector located on one side of a passive array where the medium is homogeneous. On the other side of the array the illumination by remote impulsive sources goes through a strongly scattering medium.
Adrien, Semin, Chrysoula, Tsogka, George, Papanicolaou, Josselin, Garnier   +3 more
core  

Stochastic Resonance in a Dipole [PDF]

, 1996
We show that the dipole, a system usually proposed to model relaxation phenomena, exhibits a maximum in the signal-to-noise ratio at a non-zero noise level, thus indicating the appearance of stochastic resonance.
A. Longtin, A. Peréz-Madrid, A. Pérez-Madrid, A. Simon, A. Simon, B. McNamara, B. McNamara, C. W. Gardiner, F. Marchesoni, F. Moss, J. Iwaniszewski, J. K. Douglass, J. M. G. Vilar, J. M. Rubí, J. McConnell, J. R. Klauder, K. Wiesenfeld, K. Wiesenfeld, L. D. Landau, M. I. Dykman, N. G. Stocks, P. Debye, P. E. Kloeden, R. Benzi, S. Fauve, W. T. Coffey, Z. Gingl   +26 more
core   +3 more sources

An Improved Multivariate Synchrosqueezing Wavelet Transform Denoising Method Using Subspace Projection

IEEE Access, 2020
In recent years, the development of multi-sensor has emphasized the need to directly process multi-channel (multivariate) data. In this paper, a novel multivariate synchrosqueezing wavelet transform denoising method combined with subspace projection (SWT-
Peipei Cao, Huali Wang, Kaijie Zhou
doaj   +1 more source

Recovery of Raman spectra with low signal-to-noise ratio using Wiener estimation.

Optics Express, 2014
Raman spectroscopy is a powerful non-destructive technique for qualitatively and quantitatively characterizing materials. However, noise often obscures interesting Raman peaks due to the inherently weak Raman signal, especially in biological samples.
Shuo Chen, Xiaoqian Lin, C. Yuen, Saraswathi Padmanabhan, R. Beuerman, Quan Liu   +5 more
semanticscholar   +1 more source

Enhanced analysis of gating latency in 0.35T MR‐linac through innovative time synchronization of a motion phantom and plastic scintillation detector

Journal of Applied Clinical Medical Physics, EarlyView.
Abstract Purpose This study aims to evaluate how different gantry angles, breathing rates (BPM), cine image speeds, and tracking algorithms affect beam on/off latency and the subsequent impact on target dose for a 0.35T MR‐Linac with a 6 MV FFF beam.
Mateb Al Khalifa, Tianjun Ma, Haya Aljuaid, Siyong Kim, William Y. Song   +4 more
wiley   +1 more source