Articles publicats Departament d'Informàtica, Matemàtica Aplicada i Estadística: Envíos recientes
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IBVis: Interactive Visual Analytics for Information Bottleneck Based Trajectory Clusterin
Analyzing trajectory data plays an important role in practical applications, and clustering is one of the most widely used techniques for this task. The clustering approach based on information bottleneck (IB) principle ...
A parallel GPU-based approach for reporting flock patterns
Data analysis and knowledge discovery in trajectory databases is an emerging field with a growing number of applications such as managing traffic, planning tourism infrastructures or better understanding wildlife. In this ...
Fundamentals of convex optimization for compositional data
Many of the most popular statistical techniques incorporate optimisation problems in their inner workings. A convex optimisation problem is defned as the problem of minimising a convex function over a convex set. When ...
The mathematics of compositional analysis
The term compositional data analysis is historically associated to the approach based on the logratio transformations introduced in the eighties. Two main principles of this methodology are scale invariance and subcompositional ...
Finding extremal sets on the GPU
The extremal sets of a family F of sets consist of all sets of F that are maximal or minimal with respect to the partial order induced by the subset relation in F. In this paper we present efficient parallel GPU-based ...
Acute damage to the posterior limb of the internal capsule on diffusion tensor tractography as an early imaging predictor of motor outcome after stroke
BACKGROUND AND PURPOSE: Early prediction of motor outcome is of interest in stroke management. We aimed to determine whether lesion location at DTT is predictive of motor outcome after acute stroke and whether this information ...
Size Fraction Effects on Planktonic Foraminifera Assemblages: A Compositional Contribution to the Golden Sieve Rush
A comparative study of Last Glacial to Holocene planktonic foraminiferal assemblages obtained from 150 to 106 m size fractions of a Tyrrhenian sea core was carried out by means of compositional data analysis methods. The ...
Recycling of plastic waste: Presence of phthalates in plastics from households and industry
Plastics recycling has the potential to substitute virgin plastics partially as a source of raw materials in plastic product manufacturing. Plastic as a material may contain a variety of chemicals, some potentially hazardous. ...
Convexity and symmetry of central configurations in the five-body problem: Lagrange plus two
We study convexity and symmetry of central configurations in the five body problem when three of the masses ara located at the vertices of an equilateral triangle, that we call Lagrange plus two central configurations. ...
Reusing frames in camera animation
Rendering an animation in a global illumination framework is a very costly process. Each frame has to be computed with high accuracy to avoid both noise in a single frame and ickering from frame to frame. Recently an ef ...
Intravoxel Incoherent Motion Metrics as Potential Biomarkers for Survival in Glioblastoma
Intravoxel incoherent motion (IVIM) is an MRI technique with potential applications in measuring brain tumor perfusion, but its clinical impact remains to be determined. We assessed the usefulness of IVIM-metrics in ...
Predicting Rare Earth Element Potential in Produced and Geothermal Waters of the United States via Emergent Self-Organizing Map
This work applies emergent self-organizing map (ESOM) techniques, a form of machine learning, in the multidimensional interpretation and prediction of rare earth element (REE) abundance in produced and geothermal waters ...
Network-Centric Interventions to Contain the Syphilis Epidemic in San Francisco
The number of reported early syphilis cases in San Francisco has increased steadily since 2005. It is not yet clear what factors are responsible for such an increase. A recent analysis of the sexual contact network of men ...
Reducing complexity in polygonal meshes with view-based saliency
Salient features in 3D meshes such as small high-curvature details in the middle of largely flat regions are easily ignored by most mesh simplification methods. Nevertheless, these features can be perceived by human observers ...
Analysis of an epidemic model with awareness decay on regular random networks
The existence of a die-out threshold (different from the classic disease-invasion one) defining a region of slow extinction of an epidemic has been proved elsewhere for susceptible-aware-infectious-susceptible models without ...
Ejection-Collision orbits in the symmetric collinear four–body problem
In this paper, we consider the collinear symmetric four-body problem, where four masses m3=α, m1=1, m2=1, and m4=α, α > 0, are aligned in this order and move symmetrically about their center of mass. We introduce regularized ...
Higher-order Voronoi diagrams on triangulated surfaces
We study the complexity of higher-order Voronoi diagrams on triangulated surfaces under the geodesic distance, when the sites may be polygonal domains of constant complexity. More precisely, we show that on a surface defined ...
Go with the Winners Strategy in Path Tracing
This paper proposes a new random walk strategy that minimizes the variance of the estimate using statistical estimations of local and global features of the scene. Based on the local and global properties, the algorithm ...
A scalable method to construct compact road networks from GPS trajectories
The automatic generation of road networks from GPS tracks is a challenging problem that has been receiving considerable attention in the last years. Although dozens of methods have been proposed, current techniques suffer ...
Resource Analysis driven by (Conditional) Termination Proofs
When programs feature a complex control flow, existing techniques for resource analysis produce cost relation systems (CRS) whose cost functions retain the complex flow of the program and, consequently, might not be solvable ...
