Browsing by Title
Now showing items 7-26 of 3513
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A beta partial least squares regression model: Diagnostics and application to mining industry data
(2018)We propose a methodology based on partial least squares (PLS) regression models using the beta distribution, which is useful for describing data measured between zero and one. The beta PLS model parameters are estimated ...
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A brief tutorial on quadratic stability of linear parameter-varying model for biomathematical systems
(2019)Many biological phenomena are investigated using models formulated in terms on nonlinear differential equations and, in general, the global stability is assured point-to-point by Lyapunov's theory. However, many times the ...
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A Cardy-like formula for rotating black holes with planar horizon
(2017)We show that the semiclassical entropy of D−dimensional rotating (an)isotropic black holes with planar horizon can be successfully computed according to a Cardy-like formula. This formula does not refer to any central ...
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A case study on the effects of task-based learning approach on sixth grade learners’ oral competence
(Universidad Católica del Maule, Facultad de Ciencias de la Educación, 2018) -
A case study on the impact of cooperative-based learning activities in ESP learners
(Universidad Católica del Maule, Facultad de Ciencias de la Educación, 2018) -
A Cobb–Douglas type model with stochastic restrictions: Formulation, local influence diagnostics and data analytics in economics
(2019)We propose a methodology for modelling and influence diagnostics in a Cobb–Douglas type setting. This methodology is useful for describing case-studies from economics. We consider stochastic restrictions for the model based ...
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A comparative study of third year commercial and MINEDUC high school english textbooks with regard to the development of critical thinking skills in english
(Universidad Católica del Maule, Facultad de Ciencias de la Educación, 2014)El propósito de este proyecto es comparar los verbos de instrucción presentes en las actividades de dos textos de inglés, uno usado en un establecimiento público y otro en uno privado, con el fin de determinar el grado en ...
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A comparison of stochastic gradient MCMC using multi-core and GPU architectures
(2020)Deep learning models are traditionally used in big data scenarios. When there is not enough training data to fit a large model, transfer learning re-purpose the learned features from an existing model and re-train the lower ...
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A conceptual research model for investigating the impact of online teacherpreneurship education on students’ teacherpreneurial competencies and intentions in preservice teacher education
(2020)This article seeks to develop a research model that can be employed to study the impact of online teacherpreneurship education on students' teacherpreneurial competence and intention as well as employability. Based on the ...
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A deep learning approach to population structure inference in inbred lines of maize
(2020)Analysis of population genetic variation and structure is a common practice for genome-wide studies, including association mapping, ecology, and evolution studies in several crop species. In this study, machine learning ...
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A family of skew-normal distributions for modeling proportions and rates with zeros/ones excess
(2020)In this paper, we consider skew-normal distributions for constructing new a distribution which allows us to model proportions and rates with zero/one inflation as an alternative to the inflated beta distributions. The new ...
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A framework for building safe and effective school environments: Positive behavioral interventions and supports (PBIS)
(2018)Abstract: Schools throughout the world strive to establish safe and effective learning environments. One consistent challenge is student aggression, acting-out, withdrawal, and insubordination. The historic response to ...
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A less conservative approach to handle time-varying parameters in discrete-time linear parameter-varying systems with applications in networked control systems
(2020)This article proposes a new strategy to deal with linear parameter-varying discrete-time systems, whose time-varying parameters can be written as solutions (such as exponential, trigonometric, or periodic function) of a ...
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A method to construct fruit maturity color scales based on support machines for regression: Application to olives and grape seeds
Mora, Marco
; ; ; ; Fredes, Claudio (2015)
Color scales are a powerful tool used in agriculture for estimate maturity of fruits. Fruit maturity is an important parameter to determine the harvest time. Typically, to obtain the maturity grade, a human expert visually ...
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A method to estimate grape phenolic maturity based on seed images
; Mora, Marco; Fredes, Claudio (2014)
The timing of the grape harvest has a strong impact on wine quality. A recent line of studies proposes visual seed inspection by a trained expert to determine Phenolic Maturity. In this paper a method is presented to ...
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A model based on clusters of similar color and NIR to estimate oil content of single olives
Fredes, Claudio; ; ; Mora, Marco ; ; ; (2021)
Lipid extraction using the traditional, destructive Soxhlet method is not able to measure oil content (OC) on a single olive. As the color and near infrared spectrum are key parameters to build an oil estimation model (EM), ...
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A multi-channel speech enhancement method based on subband affine projection algorithm in combination with proposed circular nested microphone array
(2021)In this paper, a novel multi-channel speech enhancement system is introduced based on a proposed circular nested microphone array (C-NMA) in combination with subband affine projection algorithm (SB-APA). The multi-channel ...
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A multi-directional gradient with bi-geometric calculus to detect contours in images with multiplicative noise
; Mora, Marco; (2018)
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 class of differential equations with impulses at instants dependent on preceding pulses. Applications to management of renewable resources
Cordova-Lepe, Fernando; ; (2012)
In this paper, a new type of mathematical model to represent certain processes with impulsive dynamic behavior is introduced. The main assumption is that the next impulse time is determined by three fundamental elements: ...
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A new descriptor for person identity verification based on handwritten strokes off-line analysis
Mora, Marco; (2017)
A new descriptor for the verification of people’s identity through the analysis of handwritten text is presented. The proposed descriptor corresponds to a representation of the pattern of writing pressure computed from the ...