Results 71 to 80 of about 3,220 (254)
A New Approach to Improve the Topological Stability in Non-Linear Dimensionality Reduction
IEEE Access, 2020 Dimensionality reduction in the machine learning field mitigates the undesired properties of high-dimensional spaces to facilitate classification, compression, and visualization of high-dimensional data.
Mohammed Elhenawy +3 more
doaj +1 more source
Sliding Mode Control in Aerospace Applications: A Survey
International Journal of Robust and Nonlinear Control, EarlyView.ABSTRACT Sliding mode control (SMC) enjoys robustness to matched and unmatched (in the case of minimum phase input‐output dynamics) bounded perturbations, and finite time convergence. Second‐order and higher‐order sliding mode control systems (2‐SMC/HOSMC) retain all the advantages of sliding mode control, but in addition can be applied to systems of ...
Yuri Shtessel, Christopher Edwards
wiley +1 more source
About Twistor Spinors with Zero in Lorentzian Geometry
Symmetry, Integrability and Geometry: Methods and Applications, 2009 We describe the local conformal geometry of a Lorentzian spin manifold (M,g) admitting a twistor spinor φ with zero. Moreover, we describe the shape of the zero set of φ.
Felipe Leitner
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A Riemannian Geometry Theory of Three-Dimensional Binocular Visual Perception
Vision, 2018 We present a Riemannian geometry theory to examine the systematically warped geometry of perceived visual space attributable to the size⁻distance relationship of retinal images associated with the optics of the human eye.
Peter D. Neilson +2 more
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Zero points of Killing vector fields, geodesic orbits, curvature, and cut locus [PDF]
Transactions of the American Mathematical Society, 1972 Let (A/, g) be a compact, connected, Riemannian manifold. Let X be a Killing vectot field on Ai. / = g(X, X) is called the length function of X. Let D denote the minimum of the distances from points to their cut loci on M. We derive an inequality involving / which enables us to prove facts relating D, the zero ponts of X, orbits of X which are closed ...
openaire +2 more sources
Wildlife Society Bulletin, EarlyView.We developed a web GIS system that delivers geospatial data for Wyoming and the Greater Yellowstone Ecosystem (GYE) using cloud‐optimized formats and open‐source tools to support regional ecological research and management. Using pronghorn as an example, we combined observed locations with environmental covariates from our geospatial library to map ...
Jessie S. Shapiro +5 more
wiley +1 more source
Archaeometry, EarlyView.ABSTRACT The discovery of archaeological sites traditionally entails the utilisation of physically demanding exploration methodologies, including terrain surveying and the analysis of historical records. Recent technological developments have led to an increased use of non‐invasive remote sensing techniques, including Google Earth, LiDAR and aerial ...
Mncedisi J. Siteleki
wiley +1 more source
Vector fields dynamics as geodesic motion on Lie groups
Comptes Rendus. Mathématique, 2006 We study to what extent vector fields on Lie groups may be considered as geodesic fields. For a given left invariant vector field on a Lie group, we prove there exists a Riemannian metric whose geodesics are its trajectories. When we consider left invariant metrics, differences between the Riemannian and the Lorentzian cases appear, coded by properties
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A tutorial on Bayesian model averaging for exponential random graph models
British Journal of Mathematical and Statistical Psychology, EarlyView.Abstract The use of exponential random graph models (ERGMs) is becoming prevalent in psychology due to their ability to explain and predict the formation of edges between vertices in a network. Valid inference with ERGMs requires correctly specifying endogenous and exogenous effects as network statistics, guided by theory, to represent the network ...
Ihnwhi Heo +2 more
wiley +1 more source
Totally geodesic property of the Hopf vector field
, 2005 We prove that the Hopf vector field is a unique one among geodesic covariantly normal unit vector fields on spheres such that the submanifold generated by the field is totally geodesic in the unit tangent bundle with Sasaki metric. As application, we give a new proof of stability (instability) of the Hopf vector field with respect to volume variation ...
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