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42 results found.

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Global and partial function approximation with evolutionary algorithms
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Kavka, Carlos et al · SEDICI UNLP · 2001
We present an evolutionary algorithm that evolves a population of local approximators in order to fit an unknown function. The evolutionary algorithm performs a simultaneous learning of simple local approximators togethe...
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On PTAS for planar graph problems
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Huang, Xiuzhen et al · SEDICI UNLP · 2006
Approximation algorithms for a class of planar graph problems, including planar independent set, planar vertex cover and planar dominating set, were intensively studied. The current upper bound on the running time of the...
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Combinatorial Optimization: Algorithms and Complexity.
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Article
David Johnson; Christos H. Papadimitriou; Kenneth Steiglitz · American Mathematical Monthly · 1984
This clearly written , mathematically rigorous text includes a novel algorithmic exposition of the simplex method and also discusses the Soviet ellipsoid algorithm for linear programming; efficient algorithms for network...
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Maximizing the spread of influence through a social network
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David Kempe; Jon Kleinberg; Éva Tardos · OpenAlex · 2003
Models for the processes by which ideas and influence propagate through a social network have been studied in a number of domains, including the diffusion of medical and technological innovations, the sudden and widespre...
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A functional programming approach to a computational biology problem
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Krasnogor, Natalio et al · SEDICI UNLP · 1997
Protein Folding is an important open problem in the eld of Computational Biology Due to its com binatorial nature exact polynomial algorithms to solve it could not exist and so approximation algorithms and heurist...
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Open Access
Fast approximate energy minimization via graph cuts
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Article
Yuri Boykov; Olga Veksler; Ramin Zabih · IEEE Transactions on Pattern Analysis and Machine Intelligence · 2001
Many tasks in computer vision involve assigning a label (such as disparity) to every pixel. A common constraint is that the labels should vary smoothly almost everywhere while preserving sharp discontinuities that may ex...
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Algorithms to prove the maximum number of MUBs in arbitrary dimension
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Cifuentes, Santiago et al · Springer · 2025 · ISSN 1573-1332
In this paper, we explore the concept of mutually unbiased bases (MUBs) in discrete quantum systems. It is known that for dimensions d that are powers of prime numbers, there exists a set of up to d+1 bases that form an ...
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Using Invasive Weed Optimization Algorithm with a Padé Approximation to Solve a System of Volterra Integral Equations
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Muhammad Almawlaa et al · University of Mosul, College of Education for Pure Science · 2024 · ISSN 1812-125X
Engineering and physics applications are described mathematically as a system of Volterra integral equations (SVIEs). Although many numerical techniques have been considered to solve SVIEs, developing more stable, and ef...
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Refinable spaces and local approximation estimates for hierarchical splines
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Article
Buffa, Annalisa et al · Oxford University Press · 2017 · ISSN 1125-1149
We study the local approximation properties in hierarchical spline spaces through multiscale quasi-interpolation operators. This construction suggests the analysis of a subspace of the classical hierarchical spline space...
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Quantifying the Bayesian Evidence for a Planet in Radial Velocity Data
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Article
Nelson, Benjamin E. et al · IOP Publishing · 2020 · ISSN 0004-6256
We present results from a data challenge posed to the radial velocity (RV) community: Namely, to quantify the Bayesian "evidence"for n = {0, 1, 2, 3} planets in a set of synthetically generated RV data sets containing a ...
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iRaPCA and SOMoC: Development and Validation of Web Applications for New Approaches for the Clustering of Small Molecules
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Prada Gori, Denis Nihuel et al · American Chemical Society · 2022 · ISSN 2987-2998
The clustering of small molecules implies the organization of a group of chemical structures into smaller subgroups with similar features. Clustering has important applications to sample chemical datasets or libraries in...
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A new self-scaling VM-algorithm for non-convex optimization, part 1
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Article
Abbas Y. AL-Bayati et al · University of Mosul, College of Education for Pure Science · 2012 · ISSN 1812-125X
Abstract The self-scaling VM-algorithms solves an unconstrained non-linear optimization problems by scaling the Hessian approximation matrix before it is updated at each iteration to avoid the possible large eigen-values...
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Adaptive filtration of the UAV movement parameters based on the AOA-measurement sensor networks
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Igor Tovkach et al · Embry-Riddle Aeronautical University · 2020 · ISSN 2374-6793
Currently, the urgent task is to assess the small-sized maneuvering UAVs movement parameters. The location of an unknown UAV as a radio source can be determined using AoA measurements of the wireless sensor network. To d...
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Digital phantoms in medical research: Synthetic data and the pursuit of ground truth
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Article
Charlotte Högberg et al · SAGE Publishing · 2026 · ISSN 2053-9517
Digital phantoms are virtual representations of the human body used in medical research to test equipment, train medical professionals and develop or validate algorithms. These models can be created from ‘real-world’...
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Fully dynamic and memory-adaptative spatial approximation trees
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Arroyuelo, Diego et al · SEDICI UNLP · 2003
Hybrid dynamic spatial approximation trees are recently proposed data structures for searching in metric spaces, based on combining the concepts of spatial approximation and pivot based algorithms. These data structures ...
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Fast and robust fixed-point algorithms for independent component analysis
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Article
Aapo Hyvärinen · IEEE Transactions on Neural Networks · 1999
Independent component analysis (ICA) is a statistical method for transforming an observed multidimensional random vector into components that are statistically as independent from each other as possible. In this paper, w...
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Greedy function approximation: A gradient boosting machine.
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Article
Jerome H. Friedman · The Annals of Statistics · 2001
Function estimation/approximation is viewed from the perspective of numerical optimization in function space, rather than parameter space. A connection is made between stagewise additive expansions and steepest-descent m...
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Boundary extraction through gradient-based evolutionary algorithm
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Article
Katz, Román et al · SEDICI UNLP · 2003
Boundary extraction is an important procedure associated with recognition and interpretation tasks in digital image processing and computer vision. Most of the segmentation techniques are based on the detection of the lo...
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Evaluation of a local strategy for high performance memory management
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Toshimi Midorikawa, Edson et al · SEDICI UNLP · 1998
Conventional operating systems, like Silicon Graphics' IRIX and IBM's AIX, adopt a single Memory Management algorithm. The choice of this algorithm is usually based on its good performance in relation to the set of progr...
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Heurísticas y método de punto proximal para la reconstrucción automática de geometría en lechos acuáticos
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García Bauza, Cristian et al · SEDICI UNLP · 2008
Se presentan algoritmos para la generación de mallas poligonales a partir de conjuntos de puntos batimétricos correspondientes a canales de navegación, cuya geometría se corresponde con distintos cortes transversales...
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Using parallel pivot vs. clustering-based techniques for web engines
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Gil Costa, Graciela Verónica et al · SEDICI UNLP · 2007
Web Engines are a useful tool for searching information in the Web. But a great part of this information is non-textual and for that case a metric space is used. A metric space is a set where a notion of distance (call...
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Open Access
An Algorithm for Least-Squares Estimation of Nonlinear Parameters
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Donald W. Marquardt · Journal of the Society for Industrial and Applied Mathematics · 1963
Previous article Next article An Algorithm for Least-Squares Estimation of Nonlinear ParametersDonald W. MarquardtDonald W. Marquardthttps://doi.org/10.1137/0111030PDFPDF PLUSBibTexSections ToolsAdd to favoritesExport Ci...
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Challenges of streaming in the visualization process
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Escarza, Sebastián et al · SEDICI UNLP · 2008
In visualization applications, the data has been increasing its size at very big rates. Processing of the whole data in main memory becomes impossible due to size limitations. A way of dealing with this constraint is to ...
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Open Access
Evolving fuzzy systems : A new strategy for rule semantics preservation
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Osella Massa, Germán Leandro et al · SEDICI UNLP · 2005
Fuzzy rule-based systems have proved to be a convenient tool for modeling complex systems. This is due to their capacity to capture their typical imprecision, which makes classical methods inefficient. At present, Fuzzy...
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Open Access
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