Results 111 to 120 of about 13,755 (295)
QDN: a variable storage algorithm for unconstrained optimization
, 1978 Naveen Garg, R. A. Tapia
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Hybrid Beamforming Design on Riemannian Manifolds for Wideband MIMO Systems
IEEE AccessThis paper proposes a novel, unified approach to design both radio frequency (RF) and baseband beamforming (BF) solutions for wideband hybrid multiple-input multiple-output (MIMO) systems using the Riemannian manifold optimization. The proposed two-stage
Hyunwoo Nam, Girim Kwon, Hyuncheol Park
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Unconstrained derivative-free optimization by successive approximation [PDF]
, 2008 Árpád Bűrmen, Tadej Tuma
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Dual Variational Problems and Action Principles for Chen–Lee and Hopf–Langford Systems
Mathematical Methods in the Applied Sciences, EarlyView.ABSTRACT We describe the construction of dual variational principles and action functionals for nonlinear dynamical systems using a methodology based on the dual Lagrange multiplier formalism and a convex optimization approach, to derive families of dual actions that correspond to the given nonlinear ordinary differential system.
A. Ghose‐Choudhury, Partha Guha
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A new Suggested Conjugate Gradient Algorithm with Logistic Mapping
Science Journal of University of Zakho, 2016 In this paper, we will use logistic mapping to find new conjugate gradient coefficients for unconstrained optimization.
Dlovan H. Omar
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Unconstrained 0–1 optimization and Lagrangean relaxation
, 1990 Warren E. Adams +2 more
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Robust constrained weighted least squares for in vivo human cardiac diffusion kurtosis imaging
Magnetic Resonance in Medicine, EarlyView.Abstract Purpose Cardiac diffusion tensor imaging (cDTI) can investigate the microstructure of heart tissue. At sufficiently high b‐values, additional information on microstructure can be observed, but the data require a representation such as diffusion kurtosis imaging (DKI).
Sam Coveney +6 more
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Scalable spokes pTx pulses for 2D turbo‐spin‐echo imaging at 7 T
Magnetic Resonance in Medicine, EarlyView.Abstract Purpose Turbo spin echo (TSE) is important clinically. Unfortunately, 7 T TSE suffers from B1+‐induced signal dropouts. Magnitude‐based parallel transmit (pTx) pulse design algorithms cannot enforce phase patterns complying with the Carr‐Purcell‐Meiboom‐Gill conditions (90° phase shift between excitation and refocusing).
Minghao Zhang, Christopher T. Rodgers
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MathematicsThe conjugate gradient (CG) directions are among the important components of the CG algorithms. These directions have proven their effectiveness in many applications—more specifically, in image processing due to their low memory requirements.
Bassim A. Hassan +4 more
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