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Listar por palabra clave "Principal component analysis"

Mostrando ítems 1-20 de 49

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'Nowcasting' de indicadores económicos combinando series de Google Trends

Cabria Rodríguez, Minerva (Universitat Politècnica de València, 2023-06-19)

[ES] Los indicadores económicos suelen publicarse con retraso con respecto al periodo temporal al que hacen referencia. Por su parte, Google Trends suministra información actualizada en tiempo real sobre la popularidad ...
A dynamic supply chain BSC-based methodology to improve operations efficiency

Rodríguez Rodríguez, Raúl; Alfaro Saiz, Juan José; Carot Sierra, José Miguel (Elsevier, 2020-11)

[EN] This paper presents how to objectively set up the process for activation of the future action plans from a supply chain Balanced Scorecard (BSC), aligning such an activation process to reach the main objectives and ...
A graphical user interface for PCA-based MSPC: A benchmark software for multivariate statistical process control in MATLAB

Villalba-Torán, Pedro Miguel; Sanchís Saez, Javier; Ferrer, Alberto (Elsevier, 2019-02-15)

[EN] A Graphical User Interface (GUI) is developed in MATLAB as a tutorial for understanding the PCA-based MSPC strategy. The software allows users to analyze both simulated and external data sets. Simulated data are ...
A potentiometric electronic tongue for the discrimination of honey according to the botanical origin. Comparison with traditional methodologies: Physicochemical parameters and volatile profile

Escriche Roberto, Mª Isabel; Kadar, Melinda Andreea; Doménech Antich, Eva Mª; Gil Sánchez, Luís (Elsevier, 2012-04)

[EN] The effectiveness of a potentiometric electronic tongue, made of various metals and metallic compounds was evaluated for the differentiation of honey in three different states: raw, liquefied and pasteurized. Principal ...
A statistical approach for a-posteriori deployment of microclimate sensors in museums: a case study

Frasca, Francesca; Verticchio, Elena; Merello, Paloma; Zarzo Castelló, Manuel; Grinde, Andreas; Fazio, Eugenio; García Diego, Fernando Juan; Siani, Anna Maria (MDPI AG, 2022-06)

[EN] The deployment of sensors is the first issue encountered when microclimate monitoring is planned in spaces devoted to the conservation of artworks. Sometimes, the first decision regarding the position of sensors may ...
An artificial neural network approach to the estimation of stem water potential from frequency domain reflectometry soil moisture measurements and meteorological data

Martí Pérez, Pau Carles; Gasque Albalate, Maria; González Altozano, Pablo (Elsevier, 2013-02)

Stem water potential seems to be a sensitive measure of plant water status. Nonetheless, it is a labour-intensive measurement and is not suited for automatic irrigation scheduling or control. This study describes the ...
Análisis no dirigido del aceite esencial de las variedades de mandarino Clemenules y Clemenpons

Gómez Torrente, María Luisa (Universitat Politècnica de València, 2015-07-20)

[EN] The fruits belonging to the clementine varieties Clemenules and Clemenpons, are of great commercial interest. They are morphologically indistinguishable, since they have a very similar size, weight, diameter, ratio ...
Automatic Detection of Optic Disc Based on PCA and Mathematical Morphology

Morales Martínez, Sandra; Naranjo Ornedo, Valeriana; Angulo Lopez, Jesus; Alcañiz Raya, Mariano Luis (Institute of Electrical and Electronics Engineers (IEEE), 2013-04)

The algorithm proposed in this paper allows to automatically segment the optic disc from a fundus image. The goal is to facilitate the early detection of certain pathologies and to fully automate the process so as to avoid ...
Automatic estimation of olive tree dendrometric parameters based on airborne laser scanning data using alpha-shape and principal component analysis

Hadas, Edyta; Borkowski, Andrzej; Estornell Cremades, Javier; Tymkow, Przemyslaw (Taylor & Francis, 2017)

[EN] The aim of this study is to present an automatic approach for olive tree dendrometric parameter estimation from airborne laser scanning (ALS) data. The proposed method is based on a unique combination of the alpha-shape ...
Automatic visual inspection of corn kernels using principal component analysis

Potter, Paulus (Universitat Politècnica de València, 2012-03-20)

During the processing of corn, corn kernels are inspected for the purpose of determining the quality and stock value. There are many kinds of defects which can reduce the stock value whereas the difference between defects ...
Bilinear modeling of batch processes. Part III: Parameter Stability

González Martínez, José María; Camacho Páez, José; Ferrer, Alberto (Wiley, 2014-01)

A paramount aspect in the development of a model for a monitoring system is the so-called parameter stability. This is inversely related to the uncertainty, i.e., the variance in the parameters estimates. Noise affects the ...
Business process improvement and the knowledge flows that cross a private online social network: An insurance supply chain case

Leon, Ramona-Diana; Rodríguez Rodríguez, Raúl; Gómez-Gasquet, Pedro; Mula, Josefa (Elsevier, 2020-07)

[EN] This paper analyses how the knowledge shared between employees and suppliers within a private enterprise social network affects process improvement. Data was collected from internal documents, and the internal and ...
Chemometric approaches to improve PLSDA model outcome for predicting human non-alcoholic fatty liver disease using UPLC-MS as a metabolic profiling tool

Quintás, Guillermo; Portillo Poblador, Nuria; García Cañaveras, Juan Carlos; Castell, José Vicente; Ferrer, Alberto; Lahoz, Agustín (Springer Verlag (Germany), 2012-02)

An MS-based metabolomics strategy including variable selection and PLSDA analysis has been assessed as a tool to discriminate between non-steatotic and steatotic human liver profiles. Different chemometric approaches for ...
Construcción de un índice de sostenibilidad para las ganaderías de bovino lechero en Cantabria

Vázquez -González, Ibán; García-Suárez, Elena; Ruiz-Escudero, Francisca; Vilela-Ferreira, Gabriel Caymmi; García-Arias, Ana Isabel (Universitat Politècnica de València, 2022-12-23)

[EN] This work is a methodological proposal for the construction of synthetic sustainability index for dairy cattle farms in Cantabria. By means of principal component factor analysis, we obtain 12 indicators, 4 for each ...
Cross-validation in PCA models with the element-wise k-fold (ekf) algorithm: theoretical aspects

Camacho Páez, José; Ferrer Riquelme, Alberto José (Wiley, 2012-07)

[EN] Cross-validation has become one of the principal methods to adjust the meta-parameters in predictive models. Extensions of the cross-validation idea have been proposed to select the number of components in principal ...
Desarrollo de algoritmos para la cuantificación de la variabilidad de la onda P en pacientes con síndrome de Brugada

García Galache, Adolfo Andrés (Universitat Politècnica de València, 2022-04-07)

[ES] El Síndrome de Brugada es una enfermedad cardíaca con una prevalencia de cerca de 5/10000 habitantes aunque posiblemente esté subestimada debido a la ausencia de sintomatología en muchos de los pacientes. No obstante, ...
Detergents sensing system based on SH-SAW devices

Vivancos, José-Luís; Rácz, Z.; Cole, M.; Soto Camino, Juan; Gardner, J.W. (Elsevier, 2011)

[EN] We report on the design and characterization of a novel analytical sensing system for the detection and discrimination of various detergents. Our sensor system could play a key role in the development of more efficient ...
Development of potentiometric equipment for the identification of altered dry-cured hams: A preliminary study

Girón Hernández, Lunier Joel; Gil Sánchez, Luís; Garcia-Breijo, Eduardo; Pagán Moreno, Mª Jesús; Barat Baviera, José Manuel; Grau Meló, Raúl (Elsevier, 2015-08)

Microbiological contamination in dry-cured ham can occur in the early stages of the process, a large number of microorganisms involved in spoilage can produce alterations in the product. These include non-common odours, ...
Diagnosis of a battery energy storage system based on principal component analysis

Banguero-Palacios, Edison; Correcher Salvador, Antonio; Pérez-Navarro Gómez, Ángel; García Moreno, Emilio; Aristizabal, Andrés (Elsevier, 2020-02)

[EN] This paper proposes the use of principal component analysis (PCA) for the state of health (SOH) diagnosis of a battery energy storage system (BESS) that is operating in a renewable energy laboratory located in Chocó, ...
Dynamic elementary mode modelling of non-steady state flux data

Folch-Fortuny, Abel; Teusink, Bas; Hoefsloot, Huub C.J.; Smilde, Age K.; Ferrer, Alberto (Springer (Biomed Central Ltd.), 2018)

[EN] A novel framework is proposed to analyse metabolic fluxes in non-steady state conditions, based on the new concept of dynamic elementary mode (dynEM): an elementary mode activated partially depending on the time point ...