Results 41 to 50 of about 2,412,507 (179)

Developing a weighting strategy to include mobile phone numbers into an ongoing population health survey using an overlapping dual-frame design with limited benchmark information

open access: yesBMC Medical Research Methodology, 2014
BackgroundIn 2012 mobile phone numbers were included into the ongoing New South Wales Population Health Survey (NSWPHS) using an overlapping dual-frame design.
Margo L Barr   +3 more
semanticscholar   +1 more source

Sparsity and spectral properties of dual frames

open access: yesLinear Algebra and its Applications, 2013
We study sparsity and spectral properties of dual frames of a given finite frame. We show that any finite frame has a dual with no more than $n^2$ non-vanishing entries, where $n$ denotes the ambient dimension, and that for most frames no sparser dual is possible.
Krahmer, Felix   +2 more
openaire   +5 more sources

Localization of the spectra of dual frames multipliers

open access: yesConstructive Mathematical Analysis, 2022
This paper concerns dual frames multipliers, i.e. operators in Hilbert spaces consisting of analysis, multiplication and synthesis processes, where the analysis and the synthesis are made by two dual frames, respectively. The goal of the paper is to give some results about the localization of the spectra of dual frames multipliers, i.e.
openaire   +4 more sources

Dynamic monitoring of biomass of rice under different nitrogen treatments using a lightweight UAV with dual image-frame snapshot cameras

open access: yesPlant Methods, 2019
Unmanned aerial vehicle (UAV)-based remote sensing provides a flexible, low-cost, and efficient approach to monitor crop growth status at fine spatial and temporal resolutions, and has a high potential to accelerate breeding process and improve precision
Haiyan Cen   +13 more
semanticscholar   +1 more source

Frame representations and Parseval duals with applications to Gabor frames [PDF]

open access: yesTransactions of the American Mathematical Society, 2008
Let {x n } be a frame for a Hilbert space H. We investigate the conditions under which there exists a dual frame for {x n } which is also a Parseval (or tight) frame. We show that the existence of a Parseval dual is equivalent to the problem whether (x n ) can be dilated to an orthonormal basis (under an oblique projection).
openaire   +3 more sources

Practical Guidelines for Dual-Frame RDD Survey METHODOLOGY (Now That the Dust is Settling)

open access: yes, 2014
Practical Guidelines for Dual-Frame RDD Survey METHODOLOGY (Now That the Dust is Settling)
M. Fahimi
semanticscholar   +1 more source

On Dual Wavelet Tight Frames

open access: yesApplied and Computational Harmonic Analysis, 1997
AbstractA characterization of multivariate dual wavelet tight frames for any general dilation matrix is presented in this paper. As an application, Lawton's result on wavelet tight frames inL2(R) is generalized to then-dimensional case. Two ways of constructing certain dual wavelet tight frames inL2(Rn) are suggested.
openaire   +2 more sources

Duals of Some Constructed $*$-Frames by Equivalent $*$-Frames

open access: yesSahand Communications in Mathematical Analysis, 2019
Hilbert frames theory have been extended to frames in Hilbert $C^*$-modules. The paper introduces equivalent $*$-frames and presents ordinary duals of a constructed $*$-frame by an adjointable and invertible operator. Also, some necessary and sufficient conditions are studied such that $*$-frames and ordinary duals or operator duals of another ...
openaire   +3 more sources

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