Browsing UJI: Investigación by Author "87f8629d-b469-4ad9-ac8e-2fe0752e1dc5"
Now showing items 1-20 of 49
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A data-driven classification of 3D foot types by archetypal shapes based on landmarks
Alcacer Sales, Aleix; Epifanio, Irene; Ibáñez Gual, Maria Victoria; Simó, Amelia; Ballester, Alfredo Costin Daniel Untaroiu (Virginia Tech, USA) (2020-01-30)The taxonomy of foot shapes or other parts of the body is important, especially for design purposes. We propose a methodology based on archetypoid analysis (ADA) that overcomes the weaknesses of previous methodologies used ... -
A Gaussian kernel for Kendall’s space of m-D shapes
Gimeno i Garcia, Vicent; Gual-Arnau, Ximo; Ibáñez Gual, Maria Victoria; Simó, Amelia Elsevier ScienceDirect (2023-08-15)In this paper, we develop an approach to exploit kernel methods with data lying on the m-D Kendall shape space. When data arise in a finite-dimensional curved Riemannian manifold, as in this case, the usual Euclidean ... -
A new extrinsic sample mean in the shape space with applications to the boundaries of anatomical structures
Gual-Arnau, Ximo; Ibáñez Gual, Maria Victoria; Simó, Amelia Wiley (2016-02-16)Shape analysis is of great importance in many fields of medical imaging and computational biology. In this paper, we consider the shape space as the set of smooth planar immersed curves in inline image (parameterized curves) ... -
A New Geometric Metric in the Shape and Size Space of Curves in R n
Epifanio, Irene; Gimeno, Vicent; Gual-Arnau, Ximo; Ibáñez Gual, Maria Victoria MDPI (2020-10-01)Shape analysis of curves in Rn is an active research topic in computer vision. While shape itself is important in many applications, there is also a need to study shape in conjunction with other features, such as scale and ... -
A review of spatiotemporal models for count data in R packages. A case study of COVID-19 data
Ibáñez Gual, Maria Victoria; Martínez Garcia, marina; Simó, Amelia MDPI (2021-07-01)Spatiotemporal models for count data are required in a wide range of scientific fields, and they have become particularly crucial today because of their ability to analyze COVID-19- related data. The main objective of this ... -
Apparel sizing using trimmed PAM and OWA operators
Ibáñez Gual, Maria Victoria; Epifanio, Irene; Simó, Amelia; Vinué Visús, Guillermo; Alemany Mut, Sandra; Domingo Esteve, Juan de Mata; Ayala Gallego, Guillermo Elsevier (2012-09)This paper is concerned with apparel sizing system design. One of the most important issues in the apparel development process is to define a sizing system that provides a good fit to the majority of the population. A ... -
Archetypal analysis with missing data: see all samples by looking at a few based on extreme profiles
Epifanio, Irene; Ibáñez Gual, Maria Victoria; Simó, Amelia American Statistical Association (2019-05-13)In this paper we propose several methodologies for handling missing or incomplete data in Archetype analysis (AA) and Archetypoid analysis (ADA). AA seeks to find archetypes, which are convex combinations of data points, ... -
Archetypal contour shapes
Alcacer Sales, Aleix; Epifanio, Irene; Ibáñez Gual, Maria Victoria; Simó, Amelia Università di Cassino e del Lazio Meridionale. Centro Editoriale di Ateneo (2019)Shapes are represented by contour functions from planar object outlines. Functional archetypal analysis is proposed to describe closed contour shapes. Each contour function is approximated by a convex combination of ... -
Archetypal Curves in the Shape and Size Space: Discovering the Salient Features of Curved Big Data by Representative Extremes
Epifanio, Irene; Gimeno, Vicent; Gual-Arnau, Ximo; Ibáñez Gual, Maria Victoria Springer (2023)Curves are complex data. Tools for visualizing, exploring, and discovering the structure of a data set of curves are valuable. In this paper, we propose a scalable methodology to solve this challenge. On the one hand, ... -
Archetypal shapes based on landmarks and extension to handle missing data
Epifanio, Irene; Ibáñez Gual, Maria Victoria; Simó, Amelia Springer Verlag (2017-10)Archetype and archetypoid analysis are extended to shapes. The objective is to find representative shapes. Archetypal shapes are pure (extreme) shapes. We focus on the case where the shape of an object is represented by a ... -
Becoming a mother shifts the activity of the social and motivation brain networks in mice
Navarro-Moreno, Cinta; Barneo-Muñoz, Manuela; Ibáñez Gual, Maria Victoria; Lanuza, Enrique; Agustín-Pavón, Carmen; Sánchez-Catalán, María José; Martinez-Garcia, Fernando Elsevier (2022-06-03)During pregnancy hormones increase motivated pup-directed behaviors. We here analyze hormone-induced changes in brain activity, by comparing cFos-immunoreactivity in the sociosexual (SBN) and motivation brain networks ... -
Can interactions among predators alter the natural regulation of an herbivore in a climate change scenario? The case of Tetranychus urticae and its predators in citrus
Urbaneja-Bernat, Pablo; Ibáñez Gual, Maria Victoria; Montserrat, Marta; Aguilar-Fenollosa, Ernestina; Jaques , Josep A. Springer (2019-06)Climate change can dramatically affect the food web configuration of arthropod communities through its effects on species interactions. We have studied whether these effects could alter the probability of local extinction ... -
Could Plant Hormones Provide a Reliable Tool for Early Detection of Rhynchophorus ferrugineus (Coleóptera: Curculionidae) Infested Palms?
Dembilio, Óscar; Agut, Blas; Ibáñez Gual, Maria Victoria; Flors, Victor; Jaques , Josep A. Entomological Research Society (2019-03)Rhynchophorus ferrugineus (Olivier) (Coleoptera: Curculionidae) is one of the most important pest of palms worldwide. A serious management problem is the difficulty of detecting early infestation stages, which is critical ... -
Curvature approximation from parabolic sectors
Gual-Arnau, Ximo; Ibáñez Gual, Maria Victoria; Monterde, Juan International Society for Stereology (2017)We propose an invariant three-point curvature approximation for plane curves based on the arc of a parabolic sector, and we analyze how closely this approximation is to the true curvature of the curve. We compare our results ... -
Dataset: Plant-feeding may explain why the generalist predator Euseius stipulatus does better on less defended citrus plants but Tetranychus-specialists Neoseiulus californicus and Phytoseiulus persimilis do not
Cruz Miralles, Joaquin; Cabedo López, Marc; Guzzo, Michela; Ibáñez Gual, Maria Victoria; Flors, Victor; Jaques , Josep A. (2021) -
Disentangling mite predator-prey relationships by multiplex PCR
Pérez Sayas, Consuelo; Pina, Tatiana; Gómez-Martínez, María Antonia; Camañes, Gemma; Ibáñez Gual, Maria Victoria; Jaques , Josep A.; Hurtado-Ruiz, Monica Wiley (2015)Gut content analysis using molecular techniques can help elucidate predator-prey relationships in situations in which other methodologies are not feasible, such as in the case of trophic interactions between minute species ... -
Economic threshold for Tetranychus urticae (Acari: Tetranychidae) in clementine mandarins Citrus clementina
Pascual Ruiz, Sara; Aguilar-Fenollosa, Ernestina; Ibáñez Gual, Maria Victoria; Hurtado-Ruiz, Monica; Martínez Ferrer, M. T. Springer (2014)Tetranychus urticae is a key pest of citrus in Spain, especially of clementine mandarin trees. The effects of this mite on fruit production were assessed in 24 clementine trees for three consecutive years. Trees were visited ... -
Effect of ground-cover management on spider mites and their phytoseiid natural enemies in clementine mandarin orchards (I): Bottom-up regulation mechanisms
Aguilar-Fenollosa, Ernestina; Ibáñez Gual, Maria Victoria; Pascual Ruiz, Sara; Hurtado-Ruiz, Monica; Jaques , Josep A. Elsevier (2011-11)Tetranychus urticae Koch (Acari: Tetranychidae) is an important pest of citrus that can also feed on most plant species occurring in the ground cover associated with this crop. To determine the effect of managing the ground ... -
Effect of ground-cover management on spider mites and their phytoseiid natural enemies in clementine mandarin orchards (II): Top-down regulation mechanisms
Aguilar-Fenollosa, Ernestina; Ibáñez Gual, Maria Victoria; Pascual Ruiz, Sara; Hurtado-Ruiz, Monica; Jaques , Josep A. Elsevier (2011-11)Tetranychus urticae Koch (Acari: Tetranychidae) is a key pest of citrus that can also feed on most plant species occurring in the ground cover associated with this crop. To determine the effect of the management of the ... -
Effectiveness of Hyperthermic Intraperitoneal Chemotherapy Associated with Cytoreductive Surgery in the Treatment of Advanced Ovarian Cancer: Systematic Review and Meta-Analysis
Llueca, Maria; Ibáñez Gual, Maria Victoria; CLIMENT MARTÍ, MARIA TERESA; Serra Rubert, Anna; Llueca, Antoni MDPI (2023-01-30)Objective: The use of hyperthermic intraperitoneal chemotherapy (HIPEC) as a treatment for epithelial ovarian cancer remains controversial. Our study aims to analyze the overall survival and disease-free survival for the ...