Articles publicats Departament d'Informàtica, Matemàtica Aplicada i Estadística: Recent submissions
Now showing items 81-100 of 441
Multiresolution image registration based on tree data structures
This paper presents a new approach for image registration based on the partitioning of the two source images in binary-space and quadtree structures, obtained with a maximum mutual information gain algorithm. Two different ...
Overestimation and underestimation biases in photon mapping with non-constant kernels
This paper presents an analysis of the overestimation bias in common used filtering kernels in the context of photon mapping density estimation. We use the joint distribution of order statistics to calculate the expected ...
Nearest and farthest spatial skyline queries under multiplicative weighted Euclidean distances
Consider two point sets in the plane, a set of points of interest and a set of query points that is used to establish distance restrictions with respect to the set of points of interest. A nearest/farthest spatial skyline ...
Solving multiple kth smallest dissimilarity queries for non-metric dissimilarities with the GPU
The kth smallest dissimilarity of a query point with respect to a given set is the dissimilarity that ranks number k when we sort, in increasing order, the dissimilarity value of the points in the set with respect to the ...
Inverse opening design with anisotropic lighting incidence
In architectural design, configuring opening shapes is a crucial element of daylight analysis. In this paper we present a new method which optimizes opening shapes to meet specified lighting design purposes. This novel ...
An Adaptive Remeshing Procedure for Proximity Maneuvering Spacecraft Formations
We consider a methodology to optimally obtain reconfigurations of spacecraft formations. It is based on the discretization of the time interval in subintervals (called the mesh) and the obtainment of local solutions on ...
Compositional data analysis (CoDA) as a tool to study the (paleo)ecology of coccolithophores from coastal-neritic settings off central Portugal
Whereas using the species percentages is the standard analytical procedure used to infer species ecological preferences, independently of taphonomical effects, the closure problem associated with closed number systems and ...
Automated blood glucose control in type 1 diabetes: A review of progress and challenges = Control automatizado de la glucosa en la diabetes tipo 1: revisión del progreso y los desafíos
Since the 2000s, research teams worldwide have been working to develop closedloop (CL) systems able to automatically control blood glucose (BG) levels in patients with type 1 diabetes. This emerging technology is known ...
Stochastic Order and Generalized Weighted Mean Invariance
In this paper, we present order invariance theoretical results for weighted quasi-arithmetic means of a monotonic series of numbers. The quasi-arithmetic mean, or Kolmogorov–Nagumo mean, generalizes the classical mean and ...
Wave-height hazard analysis in Eastern Coast of Spain: Bayesian approach using generalized Pareto distribution
Standard practice of wave-height hazard analysis often pays little attention to the uncertainty of assessed return periods and occurrence probabilities. This fact favors the opinion that, when large events happen, the ...
Combining Symbolic Tools with Interval Analysis: An Application to Solve Robust Control Problems
Complex systems are often subjected to uncertainties that make its model difficult, if not impossible to obtain. A quantitative model may be inadequate to represent the behavior of systems which require an explicit ...
On central configurations of the κn-body problem
We consider planar central configurations of the Newtonian κn-body problem consisting in κ groups of regular n-gons of equal masses, called (κ,n)-crown. We derive the equations of central configurations for a general ...
Modeling the Error of the Medtronic Paradigm Veo Enlite Glucose Sensor
Continuous glucose monitors (CGMs) are prone to inaccuracy due to time lags, sensor drift, calibration errors, and measurement noise. The aim of this study is to derive the model of the error of the second generation ...
Solving weighted CSPs with meta-constraints by reformulation into satisfiability modulo theories
We introduce WSimply, a new framework for modelling and solving Weighted Constraint Satisfaction Problems (WCSP) using Satisfiability Modulo Theories (SMT) technology. In contrast to other well-known approaches designed ...
A runtime cache for interactive procedural modeling
We present an efficient runtime cache to accelerate the display of procedurally displaced and textured implicit surfaces, exploiting spatio-temporal coherence between consecutive frames. We cache evaluations of implicit ...
An efficient and uniformly behaving streamline-based μCT fibre tracking algorithm using volume-wise structure tensor and signal processing techniques
A method for reconstructing polygonal paths of fibres in reinforced composites imaged using micro-computed tomography is formally described, implemented and tested. The algorithm has been crafted to be explicable, require ...
Saddle-node bifurcation of limit cycles in an epidemic model with two levels of awareness
In this paper we study the appearance of bifurcations of limit cycles in an epidemic model with two types of aware individuals. All the transition rates are constant except for the alerting decay rate of the most aware ...
Changing the reference measure in the simplex and its weighting effects
Standard analysis of compositional data under the assumption that the Aitchison geometry holds assumes a uniform distribution as reference measure of the space. Weighting of parts can be done changing the reference measure. ...
Spectral analysis and limit behaviours in a spring-mass system
We consider a model for a damped spring-mass system that is a strongly damped wave equation with dynamic boundary conditions. In a previous paper we showed that for some values of the parameters of the model, the large ...
Information measures for terrain visualization
Many quantitative and qualitative studies in geoscience research are based on digital elevation models (DEMs) and 3D surfaces to aid understanding of natural and anthropogenically-influenced topography. As well as their ...
