Results 21 to 30 of about 12,450 (173)

Trading off 1-norm and sparsity against rank for linear models using mathematical optimization: 1-norm minimizing partially reflexive ah-symmetric generalized inverses

open access: yesOpen Journal of Mathematical Optimization, 2021
The M-P (Moore–Penrose) pseudoinverse has as a key application the computation of least-squares solutions of inconsistent systems of linear equations. Irrespective of whether a given input matrix is sparse, its M-P pseudoinverse can be dense, potentially
Fampa, Marcia, Lee, Jon, Ponte, Gabriel
doaj   +1 more source

Modified Infinite-Time State-Dependent Riccati Equation Method for Nonlinear Affine Systems: Quadrotor Control

open access: yesApplied Sciences, 2021
This paper presents modeling and infinite-time suboptimal control of a quadcopter device using the state-dependent Riccati equation (SDRE) method. It establishes a solution to the control problem using SDRE and proposes a new procedure for solving the ...
Sławomir Stępień   +1 more
doaj   +1 more source

Approximation of the Nonlinear B-H Curve by Complex Exponential Series

open access: yesIEEE Access, 2020
The paper presents an accurate and simple method for the approximation of the nonlinear B-H curves using expansion into complex exponential series. The least-squares fit of the model is obtained by the application of the Moore-Penrose pseudoinverse.
Martin Dadic   +2 more
doaj   +1 more source

Frequency Interpolation of LOFAR Embedded Element Patterns Using Spherical Wave Expansion

open access: yesInternational Journal of Antennas and Propagation, 2021
This paper describes the use of spherical wave expansion (SWE) to model the embedded element patterns of the LOFAR low-band array. The goal is to reduce the amount of data needed to store the embedded element patterns.
M. J. Arts   +3 more
doaj   +1 more source

A Note on the UEK Method

open access: yesBarometr Regionalny, 2018
The paper concerns certain pitfalls of using the Moore-Penrose pseudoinverse for estimating regression coefficients in linear regression models when the matrix of explanatory variables has not full column rank.
Anna Pajor
doaj   +1 more source

Comparative evaluation of strategies for improving the robustness of complex networks

open access: yesApplied Network Science, 2023
Designing network systems able to sustain functionality after random failures or targeted attacks is a crucial aspect of networks. This paper investigates several strategies of link selection aiming at enhancing the robustness of a network by optimizing ...
Annalisa Socievole, Clara Pizzuti
doaj   +1 more source

Effect of Impeller Trimming on the Energy Efficiency of the Counter-Rotating Pumping Stage

open access: yesApplied Sciences, 2023
Developing ways to increase centrifugal pumps’ pressure and power characteristics is a critical problem in up-to-date engineering. There are many ways to resolve it, but each has advantages and flaws.
Ivan Pavlenko   +5 more
doaj   +1 more source

Boundary Value Problems for Delay Differential Systems

open access: yesAdvances in Difference Equations, 2010
Conditions are derived of the existence of solutions of linear Fredholm's boundary-value problems for systems of ordinary differential equations with constant coefficients and a single delay, assuming that these solutions satisfy the initial and ...
A. Boichuk   +3 more
doaj   +2 more sources

A Hadamard-type open map theorem for submersions and applications to completeness results in Control Theory [PDF]

open access: yes, 2015
We prove a quantitative openness theorem for $C^1$ submersions under suitable assumptions on the differential. We then apply our result to a class of exponential maps appearing in Carnot-Carath\'eodory spaces and we improve a classical completeness ...
Bonfiglioli, Andrea   +2 more
core   +1 more source

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