Filters








42,286 Hits in 6.2 sec

Forward-reflected-backward method with variance reduction

Ahmet Alacaoglu, Yura Malitsky, Volkan Cevher
2021 Computational optimization and applications  
AbstractWe propose a variance reduced algorithm for solving monotone variational inequalities.  ...  In the monotone case, the ergodic average converges with the optimal O(1/k) rate of convergence.  ...  Finally, our work answers an open problem posed in [23] regarding a stochastic extensions of the forward-reflected-backward method.  ... 
doi:10.1007/s10589-021-00305-3 pmid:34720428 pmcid:PMC8550342 fatcat:dyctzkychrf2ndcc7axbrxml2q

Forward and Backward Pressure Waveform Morphology in HypertensionNovelty and Significance

Ye Li, Haotian Gu, Henry Fok, Jordi Alastruey, Philip Chowienczyk
2016 Hypertension  
This variance of the amplitude of the backward wave relative to that of the forward wave (ie, variance in reflection) was explained by variation in the compliance of muscular conduit arteries, which would  ...  Thus, the amplitude of the forward wave was determined by ventricular dynamics and aortic PWV, and the backward wave was proportional to the forward wave but with some variance.  ...  • Our finding of a constant ratio of backward to forward pressure across hypertensive groups with a 2-fold difference in pulse pressure and in normotensive subjects in the presence of inotropic, vasopressor  ... 
doi:10.1161/hypertensionaha.116.08089 pmid:27920128 pmcid:PMC5222553 fatcat:yyepolx7endhba43t7e66rlhfe

Speech dereverberation using backward estimation of the late reverberant spectral variance

Emanuel A.P. Habets, Sharon Gannot, Israel Cohen
2008 2008 IEEE 25th Convention of Electrical and Electronics Engineers in Israel  
The main challenge is to develop an estimator for the so-called late reverberant spectral variance (LRSV).  ...  One novel estimator is a so-called backward estimator that uses an estimate of the early speech component to obtain an estimate of the LRSV.  ...  Reverberation reduction methods are generally divided into two categories. Methods of the first category are known as reverberation cancellation methods.  ... 
doi:10.1109/eeei.2008.4736553 fatcat:rpqokyctzjfkvghgxh3avl6rl4

A Pca/Ica Based Feature Selection Method And Its Application For Corn Fungi Detection

Zehra Cataltepe, Hakki Genc, Tom Pearson
2007 Zenodo  
The method starts with all features and reduces them one by one, and hence is sim-ilar to backward selection.  ...  We compare our PCA and ICA based algorithms' accuracy to that of backward and forward feature selections and to PCA/ICA. Our methods sometimes outperform the backward/forward selection.  ... 
doi:10.5281/zenodo.40401 fatcat:56derfaqwbcjfhbocx3ojpm52e

The Effect of Different Dimensionality Reduction Techniques on Machine Learning Overfitting Problem

Mustafa Abdul Salam, Ahmad Taher, Mustafa Samy, Khaled Mohamed
2021 International Journal of Advanced Computer Science and Applications  
These methods are missing-values ratio, low variance filter, highcorrelation filter, random forest, principal component analysis, linear discriminant analysis, backward feature elimination, forward feature  ...  Dimensionality reduction techniques are used to overcome this matter. This paper presents a detailed comparative study of nine dimensionality reduction methods.  ...  Forward Feature Construction (FFC) This method was the opposite side we observed above with the Backward Attribute Removal.  ... 
doi:10.14569/ijacsa.2021.0120480 fatcat:vzm6xmptbfhsrhncw4dtput7em

Forward-Backward Correlations and Multiplicity Fluctuations in Pb–Pb Collisions at sNN=2.76 TeV from ALICE at the LHC

Iwona Sputowska
2019 Proceedings (MDPI)  
The analysis focuses on two observables: the forward-backward correlation coefficient b c o r r n - n and the strongly intensive quantity Σ .  ...  This paper presents a comparative study of forward-backward correlations and multiplicity fluctuations in experimental data and in HIJING Monte Carlo simulations of Pb–Pb collisions at s NN = 2 . 76 TeV  ...  In the context of forward-backward multiplicity fluctuation studies, the Σ quantity is defined by the combination of forward and backward first moments n F(B) , forward and backward scaled variances ω  ... 
doi:10.3390/proceedings2019010014 fatcat:jdvpr5lrarelhiloufxllzdipa

A novel time efficient learning-based approach for smart intrusion detection system

Sugandh Seth, Gurvinder Singh, Kuljit Kaur Chahal
2021 Journal of Big Data  
Method Herein, we propose a Hybrid Feature Selection approach that aims to reduce the prediction latency without affecting attack prediction performance by lowering the model's complexity.  ...  The smart Intrusion Detection System framework evolution looks forward to designing and deploying security systems that use various parameters for analyzing current and dynamic traffic trends and are highly  ...  The wrapper method includes Forward Selection, Backward Elimination, and Exhaustive Feature Selection techniques.  ... 
doi:10.1186/s40537-021-00498-8 fatcat:n7haycf4izfnlhf3zakiija52u

Page 201 of SMPTE Motion Imaging Journal Vol. 83, Issue 3 [page]

1974 SMPTE Motion Imaging Journal  
There is no disagreement with the value — only the method of assigning a variance. The SMPTE believes the biased value more realistic.  ...  Reduction Printer Setup. There was no disagreement with the +0.1% value SMPTE assigned to the reduction printer setup.  ... 

Lagrangian tracking in stochastic fields with application to an ensemble of velocity fields in the Red Sea

Samah El Mohtar, Ibrahim Hoteit, Omar Knio, Leila Issa, Issam Lakkis
2018 Ocean Modelling  
To validate our method, we conducted various forward and backward particles tracking experiments within a realistic high-resolution ensemble assimilation setting of the Red Sea, focusing on the effect  ...  To this end, an efficient algorithm for forward and backward tracking of passive particles in stochastic flowfields is presented.  ...  Adaptive binning and variance control As mentioned in subsection 3.4, adaptive binning endows the method with the ability to limit the increase in the variance of the position of merged particles, whenever  ... 
doi:10.1016/j.ocemod.2018.08.008 fatcat:jqhyiljxbrcari5numsy3xdgu4

ERP evidence for memory and predictive mechanisms in word-to-text integration

Joseph Z. Stafura, Benjamin Rickles, Charles A. Perfetti
2015 Language, Cognition and Neuroscience  
In both tasks we found reduced N400 amplitudes over central scalp electrodes when the two words were either forward-associated (FA) or backward-associated (BA), relative to task-specific baseline conditions  ...  In the MJ task, FA pairs produced a greater reduction in the N400 reduction than BA pairs over right parietal areas.  ...  Our results differ, in that backward associated texts elicited similar N400 reductions as forward associated pairs over central scalp locations, and smaller N400 reductions relative to forward associated  ... 
doi:10.1080/23273798.2015.1062119 pmid:27110578 pmcid:PMC4840467 fatcat:vv25z6wtynecxpex2bwhvbrntq

Changes in "Top-Down" Connectivity Underlie Repetition Suppression in the Ventral Visual Pathway

M. P. Ewbank, R. P. Lawson, R. N. Henson, J. B. Rowe, L. Passamonti, A. J. Calder
2011 Journal of Neuroscience  
One proposal is that RS reflects locally based "within-region" changes, such as neural fatigue.  ...  Repetition of the same stimulus leads to a reduction in neural activity known as repetition suppression (RS).  ...  RS could modulate (1) forward connectivity only (EBA-to-FBA), (2) backward connectivity only (FBA-to-EBA), (3) both forward and backward connectivity, or (4) neither forward nor backward connectivity.  ... 
doi:10.1523/jneurosci.5013-10.2011 pmid:21490204 pmcid:PMC3759805 fatcat:jm3tc2rfvfb4pk6d2slat5drdy

Age-related changes in the neuromuscular control of forward and backward locomotion

Arthur H Dewolf, Francesca Sylos-Labini, Germana Cappellini, Yury Ivanenko, Francesco Lacquaniti
2021 PLoS ONE  
Finally, modifications of the intersegmental coordination with aging were greater during backward walking.  ...  These findings highlight age-related changes in the neuromuscular control of both forward and backward walking.  ...  The effect of age on forward gait pattern has been often associated with a reduction of ankle propulsion force, for instance [19] .  ... 
doi:10.1371/journal.pone.0246372 pmid:33596223 pmcid:PMC7888655 fatcat:hhxvwdv655g3tm2nfqwzlei5ya

A Sparse Modeling Method Based on Reduction of Cost Function in Regularized Forward Selection

Katsuyuki HAGIWARA
2014 IEICE transactions on information and systems  
We first clarify a bias and variance decomposition of the cost reduction and then derive a probabilistic upper bound for the variance of the cost reduction under some conditions.  ...  In this paper, we propose a model selection method in regularized forward selection.  ...  There are three different types of such methods: introduction of a specific cost function with parameters, backward elimination and forward selection.  ... 
doi:10.1587/transinf.e97.d.98 fatcat:4h6srz3e4fclrmeofhnky6ya4a

Impact of Tapering of Arterial Vessels on Blood Pressure, Pulse Wave Velocity, and Wave Intensity Analysis using 1‐Dimensional Computational Model

Shima Abdullateef, Jorge Mariscal‐Harana, Ashraf W Khir
2020 International Journal for Numerical Methods in Biomedical Engineering  
Next, we studied wave reflections in a combination of stepwise diameter reduction of straight vessels and bifurcations, then repeated the experiments with decreasing the length to physiological values.  ...  First, tapering is modelled as a stepwise reduction in diameter and compared with results from a continuously tapered segment.  ...  The increase in both forward and backward components of the pressure is noticeable in this model; however, the changes in the forward direction is lower compared with the backward component.  ... 
doi:10.1002/cnm.3312 pmid:31953937 fatcat:weef2koofzhpzivhdal5bcgt5m

The backward Monte Carlo method for semiconductor device simulation

Markus Kampl, Hans Kosina
2018 Journal of Computational Electronics  
A backward Monte Carlo method for the numerical solution of the semiconductor Boltzmann equation is presented. The method is particularly suited to simulate rare events.  ...  Quantities varying over many orders of magnitude can be resolved with ease.  ...  It is also possible to combine the backward and the forward MC method.  ... 
doi:10.1007/s10825-018-1225-6 fatcat:ym4npiqqtfcwfat34ps5upxbye
« Previous Showing results 1 — 15 out of 42,286 results