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Mostrando publicaciones 1-20 de 25
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A comprehensive review of extreme learning machine on medical imaging
Huérfano-Maldonado, Y; Mora, Marco; Vilches-Ponce, Karina; Hernández-García, Ruber; Gutiérrez, Rodrigo I.; Vera, M. (2023)
The feedforward neural network based on randomization has been of great interest in the scientific community, particularly extreme learning machines, due to its simplicity, training speed, and levels of accuracy comparable ...
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A multi-directional gradient with bi-geometric calculus to detect contours in images with multiplicative noise
In this paper a new operator is presented for the detection of contours in images with multiplicative noise, by using the operations introduced in the bi-geometric calculus, since recent results in the literature show that ...
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A new approach to the concept of linearity. Some elements for a multiplicative linear algebra
Córdova-Lepe, Fernando; Del Valle-Salamanca, Rodrigo; Vilches-Ponce, Karina (2020)An arithmetic based on the multiplication is the base of the Bigeometric (and Multiplicative) Calculus, a type of non-Newtonian Calculus which has had uses in the digital processing of images. In this work, we present the ...
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A new fast training algorithm for autoencoder neural networks based on extreme learning machine
Vásquez-Coronel, José A; Mora, Marco; Vilches-Ponce, Karina; Silva Pavez, Fabián; Torres-Gonzalez, Italo; Barria-Valdevenito, Pedro (2022)
Autoencoders are neural networks that are characterized by having the same inputs and outputs. This kind of Neural Networks aim to estimate a nonlinear transformation whose parameters allow to represent the input patterns ...
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A parallel computing method for the computation of the Moore-Penrose generalized inverse for shared-memory architectures
The computation of the Moore–Penrose generalized inverse is a commonly used operation in various fields such as the training of neural networks based on random weights. Therefore, a fast computation of this inverse is ...
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A simultaneous blow-up problem arising in tumor modeling
Espejo, Elio; Vilches-Ponce, Karina; Conca, Carlos (2019)Although macrophages are part of the human immune system, it has been remarkably observed in laboratory experiments that decreasing its number can slow down the tumor progression. We analyze through a recently mathematical ...
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Analysis of two discrete forms of the classic continuous SIR epidemiological model
Córdova-Lepe, Fernando; Gutiérrez, Rodrigo I.; Vilches-Ponce, Karina (2019)From continuous standard SIR model, which is configured from two sequenced flows (a) susceptible – infectious and (b) infectious – removed, we obtain two impulsive SIR models assuming different time scales for (a) respect ...
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Automatic generation of synthetic palm vein images: a nature-based approach
Salazar, E.; Hernández-García, Ruber; Barrientos, Ricardo; Vilches-Ponce, Karina; Mora, Marco
; Vásquez, A. (2021)
Biometric systems are essential in modern society because of the growing demand for security. Palm vein patterns have become an emerging biometric trait during the last decade. Despite that, the publicly available datasets ...
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Contour detection in images with speckle by using the bi-geometric structure
The speckle produces severe degradations in digital images, which could be introduced by technological devices during the acquisition, capture or transmission of the images. This perturbation affects, for instance, medical ...
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Entropy production of ion thermo-diffusion in cell membranes
Gómez-Mellado, Arturo J.; Paiva-Sánchez, Carlos F.; Vilches-Ponce, Karina; Carvacho-Contreras, Ingrid; Muñoz, T. (2019)Here, we developed a mathematical model for the ion diffusion in thermo ion-channels. Ion channels modulated by temperature are responsible for several physiological processes, including thermo-sensation. Our model is based ...
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Generating style-based palm vein synthetic images for the creation of large-scale datasets
Salazar, E.; Hernández-García, Ruber; Barrientos, Ricardo; Vilches-Ponce, Karina; Mora, Marco
; Vásquez, A. (2021)
Individuals recognition through their biometric traits is an essential component of modern society. The recent literature includes several works based on palm vein recognition for individual identification, being a very ...
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Interdisciplinarity, mathematical modelling, and poincare's work: comparing conceptions about knowledge construction
Huincahue, Jaime; Vilches-Ponce, Karina (2019)In this work we have applied the thematic analysis methodology to extract the most relevant conceptions about mathematical modelling practices using the collected opinions from a interdisciplinary team of researchers. The ...
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Introductory elements for the development of a multiplicative statistic
Indicators such as the arithmetic mean and the variance have a construction based on the additive character of the real numbers field. Here we explored the analogues of some measures of central tendency and dispersion data, ...
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Linearity and its algebra in the bi-geometrical context
The multiplicative arithmetic is the base of the Biogeometric Calculus. In this work, we present the fundamental elements to construct a multiplicative linear algebra. Some important concepts and examples are given to ...
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Longitudinal exposure to pyrethroids (3-PBA and trans-DCCA) and 2,4-D herbicide in rural schoolchildren of Maule region, Chile
Muñoz-Quezada, María Teresa; Lucero-Mondaca, Boris; Gutiérrez-Jara, Juan P.; Buralli, Rafael J.; Zúñiga-Venegas, Liliana A.; Muñoz, María Pía; Vilches-Ponce, Karina; Iglesias, Verónica (2020)Background: Several studies showed that early exposure to pesticides affects the development and health of children. In Maule, there is previous evidence of the high exposure to organophosphate pesticides (OP) of schoolchildren. ...
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Mathematical model for predicting the biomass growth of Mytilus chilensis (Hupe 1954) in suspension cultures
A growth mathematical model (individual-population) of biomass for Mytilus chilensis is introduced. This incorporates the energy variable when assuming a predation component by means of the filtering. We will assume that ...
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Mathematical modelling of some poliomyelitis vaccination and migration scenarios in Colombia
Duque-Marín, E.; Vergaño-Salazar, J. G.; Duarte-Gandica, I.; Vilches-Ponce, Karina (2019)The Poliomyelitis is an acute infection that has not eradicated worldwide. There are two types of vaccines for prevention: the live attenuated virus (OPV) and the inactivated polio virus (IPV). In Colombia, the poliomyelitis ...
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Mathematical palm vein modeling for large-scale biometric recognition
Individual recognition through palm vein authentication has gained the attention of the scientific community due to its high level of security. However, the algorithms for recognition are validated with a limited number ...
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Modeling the impact of agricultural mitigation measures on the spread of Sharka disease in sweet cherry orchards
Gutiérrez-Jara, Juan Pablo; Vogt-Geisse, Katia; G. Correa, Margarita C.; Vilches-Ponce, Karina; Pérez, Laura M.; Chowell, G. (2023)Sharka is a disease affecting stone fruit trees. It is caused by the Plum pox virus (PPV), with Myzus persicae being one of the most efficient aphid species in transmitting it within and among Prunus orchards. Other ...
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Palm vein modeling for generating synthetic images with biometric purposes: a geometrical approach
Palm vein-based biometric highlights its contactless acquisition, high precision, and user acceptance. However, the lack of publicly available databases with a large number of individuals challenges the continuous growth ...