UNIVERSIDAD PABLO DE OLAVIDE
Publications
2022
J. F. Torresand F. Martínez-Álvarezand A. Troncoso
A deep LSTM network for the Spanish electricity consumption forecasting Journal Article
In: Neural Computing and Applications, vol. 34, pp. 10533-10545, 2022.
Abstract | Links | BibTeX | Tags: deep learning, energy
@article{TORRES22b,
title = {A deep LSTM network for the Spanish electricity consumption forecasting},
author = {J. F. Torres and F. Martínez-Álvarez and A. Troncoso},
url = {https://link.springer.com/article/10.1007/s00521-021-06773-2},
doi = {https://doi.org/10.1007/s00521-021-06773-2},
year = {2022},
date = {2022-02-05},
journal = {Neural Computing and Applications},
volume = {34},
pages = {10533-10545},
abstract = {Nowadays, electricity is a basic commodity necessary for the well-being of any modern society. Due to the growth in electricity consumption in recent years, mainly in large cities, electricity forecasting is key to the management of an efficient, sustainable and safe smart grid for the consumer. In this work, a deep neural network is proposed to address the electricity consumption forecasting in the short-term, namely, a long short-term memory (LSTM) network due to its ability to deal with sequential data such as time-series data. First, the optimal values for certain hyper-parameters have been obtained by a random search and a metaheuristic, called coronavirus optimization algorithm (CVOA), based on the propagation of the SARS-Cov-2 virus. Then, the optimal LSTM has been applied to predict the electricity demand with 4-h forecast horizon. Results using Spanish electricity data during nine years and half measured with 10-min frequency are presented and discussed. Finally, the performance of the proposed LSTM using random search and the LSTM using CVOA is compared, on the one hand, with that of recently published deep neural networks (such as a deep feed-forward neural network optimized with a grid search) and temporal fusion transformers optimized with a sampling algorithm, and, on the other hand, with traditional machine learning techniques, such as a linear regression, decision trees and tree-based ensemble techniques (gradient-boosted trees and random forest), achieving the smallest prediction error below 1.5%.},
keywords = {deep learning, energy},
pubstate = {published},
tppubtype = {article}
}
Nowadays, electricity is a basic commodity necessary for the well-being of any modern society. Due to the growth in electricity consumption in recent years, mainly in large cities, electricity forecasting is key to the management of an efficient, sustainable and safe smart grid for the consumer. In this work, a deep neural network is proposed to address the electricity consumption forecasting in the short-term, namely, a long short-term memory (LSTM) network due to its ability to deal with sequential data such as time-series data. First, the optimal values for certain hyper-parameters have been obtained by a random search and a metaheuristic, called coronavirus optimization algorithm (CVOA), based on the propagation of the SARS-Cov-2 virus. Then, the optimal LSTM has been applied to predict the electricity demand with 4-h forecast horizon. Results using Spanish electricity data during nine years and half measured with 10-min frequency are presented and discussed. Finally, the performance of the proposed LSTM using random search and the LSTM using CVOA is compared, on the one hand, with that of recently published deep neural networks (such as a deep feed-forward neural network optimized with a grid search) and temporal fusion transformers optimized with a sampling algorithm, and, on the other hand, with traditional machine learning techniques, such as a linear regression, decision trees and tree-based ensemble techniques (gradient-boosted trees and random forest), achieving the smallest prediction error below 1.5%.
F. Martínez-Álvarezand A. Troncosoand H. Quintiánand E. Corchado
Special Issue SOCO 2019: New trends in soft computing and its application in industrial and environmental problems Journal Article
In: Neurocomputing, vol. 470, pp. 278-279, 2022.
@article{MARTINEZ22,
title = {Special Issue SOCO 2019: New trends in soft computing and its application in industrial and environmental problems},
author = {F. Martínez-Álvarez and A. Troncoso and H. Quintián and E. Corchado},
url = {https://www.sciencedirect.com/science/article/abs/pii/S0925231221001399},
doi = {https://doi.org/10.1016/j.neucom.2021.01.071},
year = {2022},
date = {2022-01-22},
journal = {Neurocomputing},
volume = {470},
pages = {278-279},
keywords = {},
pubstate = {published},
tppubtype = {article}
}
A. Gómez-Losadaand G. Asencio-Cortésand N. Duch-Brown
Automatic Eligibility of Sellers in an Online Marketplace: A Case Study of Amazon Algorithm Journal Article
In: Information, vol. 13, no. 44, pp. 1–16, 2022.
Abstract | Links | BibTeX | Tags: feature selection, time series
@article{losada2022,
title = {Automatic Eligibility of Sellers in an Online Marketplace: A Case Study of Amazon Algorithm},
author = {A. Gómez-Losada and G. Asencio-Cortés and N. Duch-Brown},
url = {https://www.mdpi.com/2078-2489/13/2/44},
doi = {10.3390/info13020044},
year = {2022},
date = {2022-01-01},
journal = {Information},
volume = {13},
number = {44},
pages = {1--16},
abstract = {Purchase processes on Amazon Marketplace begin at the Buy Box, which represents the buy click process through which numerous sellers compete. This study aimed to estimate empirically the relevant seller characteristics that Amazon could consider featuring in the Buy Box. To that end, 22 product categories from Italy’s Amazon web page were studied over a ten-month period, and the sellers were analyzed through their products featured in the Buy Box. Two different experiments were proposed and the results were analyzed using four classification algorithms (a neural network, random forest, support vector machine, and C5.0 decision trees) and a rule-based classification. The first experiment aimed to characterize sellers unspecifically by predicting their change at the Buy Box. The second one aimed to predict which seller would be featured in it. Both experiments revealed that the customer experience and the dynamics of the sellers’ prices were important features of the Buy Box. Additionally, we proposed a set of default features that Amazon could consider when no information about sellers was available. We also proposed the possible existence of a relationship or composition among important features that could be used for sellers to be featured in the Buy Box.},
keywords = {feature selection, time series},
pubstate = {published},
tppubtype = {article}
}
Purchase processes on Amazon Marketplace begin at the Buy Box, which represents the buy click process through which numerous sellers compete. This study aimed to estimate empirically the relevant seller characteristics that Amazon could consider featuring in the Buy Box. To that end, 22 product categories from Italy’s Amazon web page were studied over a ten-month period, and the sellers were analyzed through their products featured in the Buy Box. Two different experiments were proposed and the results were analyzed using four classification algorithms (a neural network, random forest, support vector machine, and C5.0 decision trees) and a rule-based classification. The first experiment aimed to characterize sellers unspecifically by predicting their change at the Buy Box. The second one aimed to predict which seller would be featured in it. Both experiments revealed that the customer experience and the dynamics of the sellers’ prices were important features of the Buy Box. Additionally, we proposed a set of default features that Amazon could consider when no information about sellers was available. We also proposed the possible existence of a relationship or composition among important features that could be used for sellers to be featured in the Buy Box.
M.A. Castán-Lascorzand P. Jiménez-Herreraand A. Troncosoand G. Asencio-Cortés
A new hybrid method for predicting univariate and multivariate time series based on pattern forecasting Journal Article
In: Information Sciences, vol. 586, pp. 611–627, 2022.
Abstract | Links | BibTeX | Tags: energy, pattern recognition, time series
@article{castan2022,
title = {A new hybrid method for predicting univariate and multivariate time series based on pattern forecasting},
author = {M.A. Castán-Lascorz and P. Jiménez-Herrera and A. Troncoso and G. Asencio-Cortés},
url = {https://www.sciencedirect.com/science/article/pii/S0020025521012226?via%3Dihub},
doi = {10.1016/j.ins.2021.12.001},
year = {2022},
date = {2022-01-01},
journal = {Information Sciences},
volume = {586},
pages = {611--627},
abstract = {Time series forecasting has become indispensable for multiple applications and industrial processes. Currently, a large number of algorithms have been developed to forecast time series, all of which are suitable depending on the characteristics and patterns to be inferred in each case. In this work, a new algorithm is proposed to predict both univariate and multivariate time series based on a combination of clustering, classification and forecasting techniques. The main goal of the proposed algorithm is first to group windows of time series values with similar patterns by applying a clustering process. Then, a specific forecasting model for each pattern is built and training is only conducted with the time windows corresponding to that pattern. The new algorithm has been designed using a flexible framework that allows the model to be generated using any combination of approaches within multiple machine learning techniques. To evaluate the model, several experiments are carried out using different configurations of the clustering, classification and forecasting methods that the model consists of. The results are analyzed and compared to classical prediction models, such as autoregressive, integrated, moving average and Holt-Winters models, to very recent forecasting methods, including deep, long short-term memory neural networks, and to well-known methods in the literature, such as k nearest neighbors, classification and regression trees, as well as random forest.},
keywords = {energy, pattern recognition, time series},
pubstate = {published},
tppubtype = {article}
}
Time series forecasting has become indispensable for multiple applications and industrial processes. Currently, a large number of algorithms have been developed to forecast time series, all of which are suitable depending on the characteristics and patterns to be inferred in each case. In this work, a new algorithm is proposed to predict both univariate and multivariate time series based on a combination of clustering, classification and forecasting techniques. The main goal of the proposed algorithm is first to group windows of time series values with similar patterns by applying a clustering process. Then, a specific forecasting model for each pattern is built and training is only conducted with the time windows corresponding to that pattern. The new algorithm has been designed using a flexible framework that allows the model to be generated using any combination of approaches within multiple machine learning techniques. To evaluate the model, several experiments are carried out using different configurations of the clustering, classification and forecasting methods that the model consists of. The results are analyzed and compared to classical prediction models, such as autoregressive, integrated, moving average and Holt-Winters models, to very recent forecasting methods, including deep, long short-term memory neural networks, and to well-known methods in the literature, such as k nearest neighbors, classification and regression trees, as well as random forest.
G. Velázquezand F. Moralesand M. García-Torresand F. Gómez-Velaand F. Divinaand J.L. Vázquez Nogueraand F. Daumas-Ladouceand C. Ayalaand D. Pinto-Roaand P. Gardel-Sotomayor
Distribution level Electric current consumption and meteorological data set of the East region of Paraguay Journal Article
In: Data in Brief, vol. 40, pp. 107699, 2022.
Abstract | Links | BibTeX | Tags: energy, time series
@article{velazquez2022distribution,
title = {Distribution level Electric current consumption and meteorological data set of the East region of Paraguay},
author = {G. Velázquez and F. Morales and M. García-Torres and F. Gómez-Vela and F. Divina and J.L. Vázquez Noguera and F. Daumas-Ladouce and C. Ayala and D. Pinto-Roaand P. Gardel-Sotomayor},
url = {https://www.sciencedirect.com/science/article/pii/S2352340921009744},
doi = {10.1016/j.dib.2021.107699},
year = {2022},
date = {2022-01-01},
journal = {Data in Brief},
volume = {40},
pages = {107699},
publisher = {Elsevier pubstate = published},
abstract = {This paper presents a data set with information on meteorological data and electricity consumption in the department of Alto Paraná, Paraguay. The meteorological data were registered every three hours at the Aeropuerto Guarani, Department of Alto Paraná, which belongs to the Dirección Nacional de Aeronáutica Civil of Paraguay. The final data consists of a total of 22.445 records of temperature, relative humidity, wind speed and atmospheric pressure. On the other hand, the electrical energy consumption data set contains a total of 1.848.947 records, all of them coming from the one hundred and fifteen feeders located throughout the Alto Paraná region of Paraguay. Electrical energy consumption data was provided by Administración Nacional de Electricidad (ANDE). The analysis of this data can yield insights regarding the energy consumption in the area.},
keywords = {energy, time series},
pubstate = {published},
tppubtype = {article}
}
This paper presents a data set with information on meteorological data and electricity consumption in the department of Alto Paraná, Paraguay. The meteorological data were registered every three hours at the Aeropuerto Guarani, Department of Alto Paraná, which belongs to the Dirección Nacional de Aeronáutica Civil of Paraguay. The final data consists of a total of 22.445 records of temperature, relative humidity, wind speed and atmospheric pressure. On the other hand, the electrical energy consumption data set contains a total of 1.848.947 records, all of them coming from the one hundred and fifteen feeders located throughout the Alto Paraná region of Paraguay. Electrical energy consumption data was provided by Administración Nacional de Electricidad (ANDE). The analysis of this data can yield insights regarding the energy consumption in the area.
S. Gómez-Guerreroand I. Ortizand G.and Sosa-Cabreraand M. García-Torresand C.E. Schaerer
Measuring Interactions in Categorical Datasets Using Multivariate Symmetrical Uncertainty Journal Article
In: Entropy, vol. 24, no. 1, pp. 64, 2022.
Abstract | Links | BibTeX | Tags: feature selection
@article{gomez2022measuring,
title = {Measuring Interactions in Categorical Datasets Using Multivariate Symmetrical Uncertainty},
author = {S. Gómez-Guerrero and I. Ortiz and G. and Sosa-Cabrera and M. García-Torres and C.E. Schaerer},
url = {https://www.mdpi.com/1099-4300/24/1/64},
doi = {10.3390/e24010064},
year = {2022},
date = {2022-01-01},
journal = {Entropy},
volume = {24},
number = {1},
pages = {64},
publisher = {Multidisciplinary Digital Publishing Institute},
abstract = {Interaction between variables is often found in statistical models, and it is usually expressed in the model as an additional term when the variables are numeric. However, when the variables are categorical (also known as nominal or qualitative) or mixed numerical-categorical, defining, detecting, and measuring interactions is not a simple task. In this work, based on an entropy-based correlation measure for n nominal variables (named as Multivariate Symmetrical Uncertainty (MSU)), we propose a formal and broader definition for the interaction of the variables. Two series of experiments are presented. In the first series, we observe that datasets where some record types or combinations of categories are absent, forming patterns of records, which often display interactions among their attributes. In the second series, the interaction/non-interaction behavior of a regression model (entirely built on continuous variables) gets successfully replicated under a discretized version of the dataset. It is shown that there is an interaction-wise correspondence between the continuous and the discretized versions of the dataset. Hence, we demonstrate that the proposed definition of interaction enabled by the MSU is a valuable tool for detecting and measuring interactions within linear and non-linear models.},
keywords = {feature selection},
pubstate = {published},
tppubtype = {article}
}
Interaction between variables is often found in statistical models, and it is usually expressed in the model as an additional term when the variables are numeric. However, when the variables are categorical (also known as nominal or qualitative) or mixed numerical-categorical, defining, detecting, and measuring interactions is not a simple task. In this work, based on an entropy-based correlation measure for n nominal variables (named as Multivariate Symmetrical Uncertainty (MSU)), we propose a formal and broader definition for the interaction of the variables. Two series of experiments are presented. In the first series, we observe that datasets where some record types or combinations of categories are absent, forming patterns of records, which often display interactions among their attributes. In the second series, the interaction/non-interaction behavior of a regression model (entirely built on continuous variables) gets successfully replicated under a discretized version of the dataset. It is shown that there is an interaction-wise correspondence between the continuous and the discretized versions of the dataset. Hence, we demonstrate that the proposed definition of interaction enabled by the MSU is a valuable tool for detecting and measuring interactions within linear and non-linear models.
C. Segarra-Martínand M. Martínez-Ballesterosand A. Troncosoand F. Martínez-Álvarez
A novel approach to discover numerical association based on the Coronavirus Optimization Algorithm Conference
SAC 37th Symposium On Applied Computing, 2022.
Abstract | BibTeX | Tags: association rules
@conference{SAC2022,
title = {A novel approach to discover numerical association based on the Coronavirus Optimization Algorithm },
author = {C. Segarra-Martín and M. Martínez-Ballesteros and A. Troncoso and F. Martínez-Álvarez},
year = {2022},
date = {2022-01-01},
booktitle = {SAC 37th Symposium On Applied Computing},
abstract = {The disease caused by the SARS-CoV-2 (COVID-19) has affected millions of people around the world since its detection in 2019. This pandemic inspired the development of the Coronavirus Optimization Algorithm (CVOA), a bio-inspired metaheuristic that was originally used to adjust deep learning models for time series forecasting, by means of a binary codification. In this paper, a integer codification for the CVOA individual is introduced and used for optimizing a novel approach for numerical association rules mining. In addition, the CVOA setting parameters have been updated and a vaccination rate based on real data has been incorporated, to make it more efficient. As an application case, the prediction of earthquakes of large magnitude has been addressed. This kind of events are rare and, therefore, they can be characterized by rules with very high interest or lift and low support. Thus, the algorithm has been applied to the extraction of rules meeting specific criteria in an earthquake data set, provided by the National Geographic Institute of Spain. The results show CVOA as a promising tool for numerical association rules mining, obtaining rules with useful and meaningful information for predicting the occurrence of large earthquakes.},
keywords = {association rules},
pubstate = {published},
tppubtype = {conference}
}
The disease caused by the SARS-CoV-2 (COVID-19) has affected millions of people around the world since its detection in 2019. This pandemic inspired the development of the Coronavirus Optimization Algorithm (CVOA), a bio-inspired metaheuristic that was originally used to adjust deep learning models for time series forecasting, by means of a binary codification. In this paper, a integer codification for the CVOA individual is introduced and used for optimizing a novel approach for numerical association rules mining. In addition, the CVOA setting parameters have been updated and a vaccination rate based on real data has been incorporated, to make it more efficient. As an application case, the prediction of earthquakes of large magnitude has been addressed. This kind of events are rare and, therefore, they can be characterized by rules with very high interest or lift and low support. Thus, the algorithm has been applied to the extraction of rules meeting specific criteria in an earthquake data set, provided by the National Geographic Institute of Spain. The results show CVOA as a promising tool for numerical association rules mining, obtaining rules with useful and meaningful information for predicting the occurrence of large earthquakes.
L. Melgar-Garcíaand D. Gutiérrez-Avilésand M. T. Godinhoand R. Espadaand I. S. Britoand F. Martínez-Álvarezand A. Troncosoand C. Rubio-Escudero
A new big data triclustering approach for extracting three-dimensional patterns in precision agriculture Journal Article
In: Neurocomputing, vol. 500, pp. 268-278, 2022.
Abstract | Links | BibTeX | Tags: big data, pattern recognition
@article{MELGAR21_NEUCOMb,
title = {A new big data triclustering approach for extracting three-dimensional patterns in precision agriculture},
author = {L. Melgar-García and D. Gutiérrez-Avilés and M. T. Godinho and R. Espada and I. S. Brito and F. Martínez-Álvarez and A. Troncoso and C. Rubio-Escudero},
url = {https://www.sciencedirect.com/science/article/abs/pii/S0925231222006415},
doi = {https://doi.org/10.1016/j.neucom.2021.06.101},
year = {2022},
date = {2022-01-01},
journal = {Neurocomputing},
volume = {500},
pages = {268-278},
abstract = {Precision agriculture focuses on the development of site-specific harvest considering the variability of each crop area. Vegetation indices allow the study and delineation of different characteristics of each field zone, generally invisible to the naked-eye. This paper introduces a new big data triclustering approach based on evolutionary algorithms. The algorithm shows its capability to discover three-dimensional patterns on the basis of vegetation indices from vine crops. Different vegetation indices have been tested to find different patterns in the crops. The results reported using a vineyard crop located in Portugal depicts four areas with different moisture stress particularities that can lead to changes in the management of the vineyard. Furthermore, scalability studies have been performed, showing that the proposed algorithm is suitable for dealing with big datasets.},
keywords = {big data, pattern recognition},
pubstate = {published},
tppubtype = {article}
}
Precision agriculture focuses on the development of site-specific harvest considering the variability of each crop area. Vegetation indices allow the study and delineation of different characteristics of each field zone, generally invisible to the naked-eye. This paper introduces a new big data triclustering approach based on evolutionary algorithms. The algorithm shows its capability to discover three-dimensional patterns on the basis of vegetation indices from vine crops. Different vegetation indices have been tested to find different patterns in the crops. The results reported using a vineyard crop located in Portugal depicts four areas with different moisture stress particularities that can lead to changes in the management of the vineyard. Furthermore, scalability studies have been performed, showing that the proposed algorithm is suitable for dealing with big datasets.
J. A. Gallardo-Gómezand F. Divinaand A. Troncosoand F. Martínez-Álvarez
Explainable Artificial Intelligence for the Electric Vehicle Load Demand Forecasting Problem Conference
SOCO 17th International Conference on Soft Computing Models in Industrial and Environmental Applications, Advances in Intelligent Systems and Computing 2022.
Links | BibTeX | Tags: big data, energy, time series
@conference{gallardo2022explainable,
title = {Explainable Artificial Intelligence for the Electric Vehicle Load Demand Forecasting Problem},
author = {J. A. Gallardo-Gómez and F. Divina and A. Troncoso and F. Martínez-Álvarez },
url = {https://link.springer.com/chapter/10.1007/978-3-030-87869-6_65},
year = {2022},
date = {2022-01-01},
booktitle = {SOCO 17th International Conference on Soft Computing Models in Industrial and Environmental Applications},
pages = {413-422},
series = { Advances in Intelligent Systems and Computing},
keywords = {big data, energy, time series},
pubstate = {published},
tppubtype = {conference}
}
F. Delgado-Chavesand P. M. Martínez-Garcíaand A. Herrero-Ruizand F. Gómez-Velaand F. Divinaand S. Jimeno-Gonzálezand F. Cortés-Ledesma
Data of transcriptional effects of the merbarone-mediated inhibition of TOP2 Journal Article
In: Data in Brief, vol. 44, pp. 108499, 2022.
Abstract | Links | BibTeX | Tags: bioinformatics
@article{delgado2022data,
title = {Data of transcriptional effects of the merbarone-mediated inhibition of TOP2},
author = {F. Delgado-Chaves and P. M. Martínez-García and A. Herrero-Ruiz and F. Gómez-Vela and F. Divina and S. Jimeno-González and F. Cortés-Ledesma},
url = {https://www.sciencedirect.com/science/article/pii/S235234092200693X},
doi = {10.1016/j.dib.2022.108499},
year = {2022},
date = {2022-01-01},
journal = {Data in Brief},
volume = {44},
pages = {108499},
publisher = {Elsevier},
abstract = {Type II DNA topoisomerases relax topological stress by transiently gating DNA passage in a controlled cut-and-reseal mechanism that affects both DNA strands. Therefore, they are essential to overcome topological problems associated with DNA metabolism. Their aberrant activity results in the generation of DNA double-strand breaks, which can seriously compromise cell survival and genome integrity. Here, we profile the transcriptome of human-telomerase-immortalized retinal pigment epithelial 1 (RPE-1) cells when treated with merbarone, a drug that catalytically inhibits type II DNA topoisomerases. We performed RNA-Seq after 4 and 8 h of merbarone treatment and compared transcriptional profiles versus untreated samples. We report raw sequencing data together with lists of gene counts and differentially expressed genes.},
keywords = {bioinformatics},
pubstate = {published},
tppubtype = {article}
}
Type II DNA topoisomerases relax topological stress by transiently gating DNA passage in a controlled cut-and-reseal mechanism that affects both DNA strands. Therefore, they are essential to overcome topological problems associated with DNA metabolism. Their aberrant activity results in the generation of DNA double-strand breaks, which can seriously compromise cell survival and genome integrity. Here, we profile the transcriptome of human-telomerase-immortalized retinal pigment epithelial 1 (RPE-1) cells when treated with merbarone, a drug that catalytically inhibits type II DNA topoisomerases. We performed RNA-Seq after 4 and 8 h of merbarone treatment and compared transcriptional profiles versus untreated samples. We report raw sequencing data together with lists of gene counts and differentially expressed genes.
F. Moralesand M. García-Torresand G. Velázquezand F. Daumas-Ladouceand P. Gardel-Sotomayorand F. Gómez-Velaand F. Divinaand J. L. Vázquez Nogueraand C. Sauer Ayalaand D. Pinto-Roa
Analysis of Electric Energy Consumption Profiles Using a Machine Learning Approach: A Paraguayan Case Study Journal Article
In: Electronics, vol. 11, no. 2, pp. 267, 2022.
Abstract | Links | BibTeX | Tags: big data, energy, time series
@article{morales2022analysisb,
title = {Analysis of Electric Energy Consumption Profiles Using a Machine Learning Approach: A Paraguayan Case Study},
author = {F. Morales and M. García-Torres and G. Velázquez and F. Daumas-Ladouce and P. Gardel-Sotomayor and F. Gómez-Vela and F. Divina and J. L. Vázquez Noguera and C. Sauer Ayala and D. Pinto-Roa},
url = {https://www.mdpi.com/2079-9292/11/2/267},
doi = {10.3390/electronics11020267},
year = {2022},
date = {2022-01-01},
journal = {Electronics},
volume = {11},
number = {2},
pages = {267},
abstract = {Correctly defining and grouping electrical feeders is of great importance for electrical system operators. In this paper, we compare two different clustering techniques, K-means and hierarchical agglomerative clustering, applied to real data from the east region of Paraguay. The raw data were pre-processed, resulting in four data sets, namely, (i) a weekly feeder demand, (ii) a monthly feeder demand, (iii) a statistical feature set extracted from the original data and (iv) a seasonal and daily consumption feature set obtained considering the characteristics of the Paraguayan load curve. Considering the four data sets, two clustering algorithms, two distance metrics and five linkage criteria a total of 36 models with the Silhouette, Davies–Bouldin and Calinski–Harabasz index scores was assessed. The K-means algorithms with the seasonal feature data sets showed the best performance considering the Silhouette, Calinski–Harabasz and Davies–Bouldin validation index scores with a configuration of six clusters.},
keywords = {big data, energy, time series},
pubstate = {published},
tppubtype = {article}
}
Correctly defining and grouping electrical feeders is of great importance for electrical system operators. In this paper, we compare two different clustering techniques, K-means and hierarchical agglomerative clustering, applied to real data from the east region of Paraguay. The raw data were pre-processed, resulting in four data sets, namely, (i) a weekly feeder demand, (ii) a monthly feeder demand, (iii) a statistical feature set extracted from the original data and (iv) a seasonal and daily consumption feature set obtained considering the characteristics of the Paraguayan load curve. Considering the four data sets, two clustering algorithms, two distance metrics and five linkage criteria a total of 36 models with the Silhouette, Davies–Bouldin and Calinski–Harabasz index scores was assessed. The K-means algorithms with the seasonal feature data sets showed the best performance considering the Silhouette, Calinski–Harabasz and Davies–Bouldin validation index scores with a configuration of six clusters.
P. Mugaririand H. Abdullahand M. García-Torresand B.D. Parameshchariand K.N. Abdul-Sattar
Promoting Information Privacy Protection Awareness for Internet of Things (IoT) Journal Article
In: Mobile Information Systems, vol. 2022, pp. 1–11, 2022.
Abstract | Links | BibTeX | Tags: IoT
@article{mugariri2022promoting,
title = {Promoting Information Privacy Protection Awareness for Internet of Things (IoT)},
author = {P. Mugariri and H. Abdullah and M. García-Torres and B.D. Parameshchari and K.N. Abdul-Sattar},
url = {https://www.hindawi.com/journals/misy/2022/4247651/},
doi = {10.1155/2022/4247651},
year = {2022},
date = {2022-01-01},
journal = {Mobile Information Systems},
volume = {2022},
pages = {1--11},
abstract = {The Internet of Things (IoT) has had a considerable influence on our daily lives by enabling enhanced connection of devices, systems, and services that extends beyond machine-to-machine interactions and encompasses a wide range of protocols, domains, and applications. However, despite privacy concerns shown by IoT users, little has been done to reduce and protect individual information exposure. It is extremely difficult to mitigate IoT devices from reidentification threats which is why it is still a major challenge for IoT users to securely protect their information. The trust controls how we regulate privacy in our IoT platforms in the same way that it governs personal relationships. As IoT devices become increasingly linked, more data is shared across individuals, businesses, governments, and ecosystems. Technologies, sensors, machines, data, and cloud connections all rely largely on trust relationships that have been formed. With the rapid growth of additional types of IoT devices that are being introduced, it, therefore, expands privacy concerns and is difficult to develop trust with an IoT system or device without the option to regulate information privacy settings. Privacy has always been a barrier for many devices as they race for the early adoption of IoT technologies. Several Internet of Things devices or systems will continue to pose privacy threats. As a result, the main objective of this study was to examine the individual understanding of privacy and to promote information privacy protection awareness not only to IoT users but also to organizations that use IoT devices or platforms to run their day-to-day business operations. Furthermore, the objective extends to compare user knowledge and concerns about IoT privacy, as well as to identify any common attitudes and variances. However, in terms of enhancing individuals’ knowledge, an artifact was developed to educate and enhance information privacy awareness among IoT users. A pre- and postquestionnaire was generated to test and validate user knowledge regarding information privacy protection in IoT. The study was conducted using a quantitative research method. Findings indicate that IoT users’ awareness of information privacy protection turned out to be average, suggesting a need for education and awareness. Several participants stated that information privacy protection awareness is required within the community to educate, raise awareness, eliminate human error, and enable individuals to be conscious of their privacy when surfing the Internet.},
keywords = {IoT},
pubstate = {published},
tppubtype = {article}
}
The Internet of Things (IoT) has had a considerable influence on our daily lives by enabling enhanced connection of devices, systems, and services that extends beyond machine-to-machine interactions and encompasses a wide range of protocols, domains, and applications. However, despite privacy concerns shown by IoT users, little has been done to reduce and protect individual information exposure. It is extremely difficult to mitigate IoT devices from reidentification threats which is why it is still a major challenge for IoT users to securely protect their information. The trust controls how we regulate privacy in our IoT platforms in the same way that it governs personal relationships. As IoT devices become increasingly linked, more data is shared across individuals, businesses, governments, and ecosystems. Technologies, sensors, machines, data, and cloud connections all rely largely on trust relationships that have been formed. With the rapid growth of additional types of IoT devices that are being introduced, it, therefore, expands privacy concerns and is difficult to develop trust with an IoT system or device without the option to regulate information privacy settings. Privacy has always been a barrier for many devices as they race for the early adoption of IoT technologies. Several Internet of Things devices or systems will continue to pose privacy threats. As a result, the main objective of this study was to examine the individual understanding of privacy and to promote information privacy protection awareness not only to IoT users but also to organizations that use IoT devices or platforms to run their day-to-day business operations. Furthermore, the objective extends to compare user knowledge and concerns about IoT privacy, as well as to identify any common attitudes and variances. However, in terms of enhancing individuals’ knowledge, an artifact was developed to educate and enhance information privacy awareness among IoT users. A pre- and postquestionnaire was generated to test and validate user knowledge regarding information privacy protection in IoT. The study was conducted using a quantitative research method. Findings indicate that IoT users’ awareness of information privacy protection turned out to be average, suggesting a need for education and awareness. Several participants stated that information privacy protection awareness is required within the community to educate, raise awareness, eliminate human error, and enable individuals to be conscious of their privacy when surfing the Internet.
D. Aquino-Brítezand J.A. Gómezand J.L. Vázquez Nogueraand M. García-Torresand J.C. Mello Románand P.E. Gardel-Sotomayorand V.E. Castillo Benitezand I. Castro Mattoand D.P. Pinto-Roaand J. Faconand S.A. Grillo
Automatic Diagnosis of Diabetic Retinopathy from Fundus Images Using Neuro-Evolutionary Algorithms Journal Article
In: Studies in Health Technology and Informatics, vol. 290, pp. 689–693, 2022.
Abstract | Links | BibTeX | Tags: bioinformatics
@article{aquino2022automatic,
title = {Automatic Diagnosis of Diabetic Retinopathy from Fundus Images Using Neuro-Evolutionary Algorithms},
author = {D. Aquino-Brítez and J.A. Gómez and J.L. Vázquez Noguera and M. García-Torres and J.C. Mello Román and P.E. Gardel-Sotomayor and V.E. Castillo Benitez and I. Castro Matto and D.P. Pinto-Roa and J. Facon and S.A. Grillo},
doi = {10.3233/SHTI220166},
year = {2022},
date = {2022-01-01},
journal = {Studies in Health Technology and Informatics},
volume = {290},
pages = {689--693},
abstract = {Due to the presence of high glucose levels, diabetes mellitus (DM) is a widespread disease that can damage blood vessels in the retina and lead to loss of the visual system. To combat this disease, called Diabetic Retinopathy (DR), retinography, using images of the fundus of the retina, is the most used method for the diagnosis of Diabetic Retinopathy. The Deep Learning (DL) area achieved high performance for the classification of retinal images and even achieved almost the same human performance in diagnostic tasks. However, the performance of DL architectures is highly dependent on the optimal configuration of the hyperparameters. In this article, we propose the use of Neuroevolutionary Algorithms to optimize the hyperparameters corresponding to the DL model for the diagnosis of DR. The results obtained prove that the proposed method outperforms the results obtained by the classical approach.},
keywords = {bioinformatics},
pubstate = {published},
tppubtype = {article}
}
Due to the presence of high glucose levels, diabetes mellitus (DM) is a widespread disease that can damage blood vessels in the retina and lead to loss of the visual system. To combat this disease, called Diabetic Retinopathy (DR), retinography, using images of the fundus of the retina, is the most used method for the diagnosis of Diabetic Retinopathy. The Deep Learning (DL) area achieved high performance for the classification of retinal images and even achieved almost the same human performance in diagnostic tasks. However, the performance of DL architectures is highly dependent on the optimal configuration of the hyperparameters. In this article, we propose the use of Neuroevolutionary Algorithms to optimize the hyperparameters corresponding to the DL model for the diagnosis of DR. The results obtained prove that the proposed method outperforms the results obtained by the classical approach.
Gaia collaboration
Gaia Early Data Release 3-The celestial reference frame (Gaia-CRF3) Journal Article
In: Astronomy & Astrophysics, vol. 667, no. A148, pp. A148, 2022.
Abstract | Links | BibTeX | Tags: astrostatistics
@article{klioner2022gaia,
title = {Gaia Early Data Release 3-The celestial reference frame (Gaia-CRF3)},
author = {Gaia collaboration},
url = {https://www.aanda.org/articles/aa/abs/2022/11/aa43483-22/aa43483-22.html},
doi = {10.1051/0004-6361/202243483},
year = {2022},
date = {2022-01-01},
journal = {Astronomy & Astrophysics},
volume = {667},
number = {A148},
pages = {A148},
abstract = {Gaia-CRF3 is the celestial reference frame for positions and proper motions in the third release of data from the Gaia mission, Gaia DR3 (and for the early third release, Gaia EDR3, which contains identical astrometric results). The reference frame is defined by the positions and proper motions at epoch 2016.0 for a specific set of extragalactic sources in the (E)DR3 catalogue. Aims. We describe the construction of Gaia-CRF3 and its properties in terms of the distributions in magnitude, colour, and astrometric quality. Methods. Compact extragalactic sources in Gaia DR3 were identified by positional cross-matching with 17 external catalogues of quasi-stellar objects (QSO) and active galactic nuclei (AGN), followed by astrometric filtering designed to remove stellar contaminants. Selecting a clean sample was favoured over including a higher number of extragalactic sources. For the final sample, the random and systematic errors in the proper motions are analysed, as well as the radio-optical offsets in position for sources in the third realisation of the International Celestial Reference Frame (ICRF3). Results. Gaia-CRF3 comprises about 1.6 million QSO-like sources, of which 1.2 million have five-parameter astrometric solutions in Gaia DR3 and 0.4 million have six-parameter solutions. The sources span the magnitude range G = 13–21 with a peak density at 20.6 mag, at which the typical positional uncertainty is about 1 mas. The proper motions show systematic errors on the level of 12 µas yr–1 on angular scales greater than 15 deg. For the 3142 optical counterparts of ICRF3 sources in the S/X frequency bands, the median offset from the radio positions is about 0.5 mas, but it exceeds 4 mas in either coordinate for 127 sources. We outline the future of Gaia-CRF in the next Gaia data releases. Appendices give further details on the external catalogues used, how to extract information about the Gaia-CRF3 sources, potential (Galactic) confusion sources, and the estimation of the spin and orientation of an astrometric solution.},
keywords = {astrostatistics},
pubstate = {published},
tppubtype = {article}
}
Gaia-CRF3 is the celestial reference frame for positions and proper motions in the third release of data from the Gaia mission, Gaia DR3 (and for the early third release, Gaia EDR3, which contains identical astrometric results). The reference frame is defined by the positions and proper motions at epoch 2016.0 for a specific set of extragalactic sources in the (E)DR3 catalogue. Aims. We describe the construction of Gaia-CRF3 and its properties in terms of the distributions in magnitude, colour, and astrometric quality. Methods. Compact extragalactic sources in Gaia DR3 were identified by positional cross-matching with 17 external catalogues of quasi-stellar objects (QSO) and active galactic nuclei (AGN), followed by astrometric filtering designed to remove stellar contaminants. Selecting a clean sample was favoured over including a higher number of extragalactic sources. For the final sample, the random and systematic errors in the proper motions are analysed, as well as the radio-optical offsets in position for sources in the third realisation of the International Celestial Reference Frame (ICRF3). Results. Gaia-CRF3 comprises about 1.6 million QSO-like sources, of which 1.2 million have five-parameter astrometric solutions in Gaia DR3 and 0.4 million have six-parameter solutions. The sources span the magnitude range G = 13–21 with a peak density at 20.6 mag, at which the typical positional uncertainty is about 1 mas. The proper motions show systematic errors on the level of 12 µas yr–1 on angular scales greater than 15 deg. For the 3142 optical counterparts of ICRF3 sources in the S/X frequency bands, the median offset from the radio positions is about 0.5 mas, but it exceeds 4 mas in either coordinate for 127 sources. We outline the future of Gaia-CRF in the next Gaia data releases. Appendices give further details on the external catalogues used, how to extract information about the Gaia-CRF3 sources, potential (Galactic) confusion sources, and the estimation of the spin and orientation of an astrometric solution.
Gaia Collaboration
Gaia Data Release 3. Summary of the content and survey properties Journal Article
In: Astronomy & Astrophysics, 2022.
Abstract | Links | BibTeX | Tags: astrostatistics
@article{vallenari2022gaia,
title = {Gaia Data Release 3. Summary of the content and survey properties},
author = {Gaia Collaboration},
url = {https://www.aanda.org/component/article?access=doi&doi=10.1051/0004-6361/202243940},
doi = {10.1051/0004-6361/202243940},
year = {2022},
date = {2022-01-01},
journal = {Astronomy & Astrophysics},
abstract = {We present the third data release of the European Space Agency’s Gaia mission, Gaia DR3. This release includes a large variety of new data products, notably a much expanded radial velocity survey and a very extensive astrophysical characterisation of Gaia sources. Aims. We outline the content and the properties of Gaia DR3, providing an overview of the main improvements in the data processing in compar- ison with previous data releases (where applicable) and a brief discussion of the limitations of the data in this release. Methods. The Gaia DR3 catalogue is the outcome of the processing of raw data collected with the Gaia instruments during the first 34 months of the mission by the Gaia Data Processing and Analysis Consortium. Results. The Gaia DR3 catalogue contains the same source list, celestial positions, proper motions, parallaxes, and broad band photometry in the G, GBP, and GRP pass-bands already present in the Early Third Data Release, Gaia EDR3. Gaia DR3 introduces an impressive wealth of new data products. More than 33 million objects in the ranges GRVS < 14 and 3100 < Teff < 14500, have new determinations of their mean radial velocities based on data collected by Gaia. We provide GRVS magnitudes for most sources with radial velocities, and a line broadening parameter is listed for a subset of these. Mean Gaia spectra are made available to the community. The Gaia DR3 catalogue includes about 1 million mean spectra from the radial velocity spectrometer, and about 220 million low-resolution blue and red prism photometer BP/RP mean spectra. The results of the analysis of epoch photometry are provided for some 10 million sources across 24 variability types. Gaia DR3 includes astrophysical parameters and source class probabilities for about 470 million and 1500 million sources, respectively, including stars, galaxies, and quasars. Orbital elements and trend parameters are provided for some 800 000 astrometric, spectroscopic and eclipsing binaries. More than 150 000 Solar System objects, including new discoveries, with preliminary orbital solutions and individual epoch observations are part of this release. Reflectance spectra derived from the epoch BP/RP spectral data are published for about 60 000 asteroids. Finally, an additional data set is provided, namely the Gaia Andromeda Photometric Survey, consisting of the photometric time series for all sources located in a 5.5 degree radius field centred on the Andromeda galaxy. Conclusions. This data release represents a major advance with respect to Gaia DR2 and Gaia EDR3 because of the unprecedented quantity, quality, and variety of source astrophysical data. To date this is the largest collection of all-sky spectrophotometry, radial velocities, variables, and astrophysical parameters derived from both low- and high-resolution spectra and includes a spectrophotometric and dynamical survey of SSOs of the highest accuracy. The non-single star content surpasses the existing data by orders of magnitude. The quasar host and galaxy light profile collection is the first such survey that is all sky and space based. The astrophysical information provided in Gaia DR3 will unleash the full potential of Gaia’s exquisite astrometric, photometric, and radial velocity surveys.},
keywords = {astrostatistics},
pubstate = {published},
tppubtype = {article}
}
We present the third data release of the European Space Agency’s Gaia mission, Gaia DR3. This release includes a large variety of new data products, notably a much expanded radial velocity survey and a very extensive astrophysical characterisation of Gaia sources. Aims. We outline the content and the properties of Gaia DR3, providing an overview of the main improvements in the data processing in compar- ison with previous data releases (where applicable) and a brief discussion of the limitations of the data in this release. Methods. The Gaia DR3 catalogue is the outcome of the processing of raw data collected with the Gaia instruments during the first 34 months of the mission by the Gaia Data Processing and Analysis Consortium. Results. The Gaia DR3 catalogue contains the same source list, celestial positions, proper motions, parallaxes, and broad band photometry in the G, GBP, and GRP pass-bands already present in the Early Third Data Release, Gaia EDR3. Gaia DR3 introduces an impressive wealth of new data products. More than 33 million objects in the ranges GRVS < 14 and 3100 < Teff < 14500, have new determinations of their mean radial velocities based on data collected by Gaia. We provide GRVS magnitudes for most sources with radial velocities, and a line broadening parameter is listed for a subset of these. Mean Gaia spectra are made available to the community. The Gaia DR3 catalogue includes about 1 million mean spectra from the radial velocity spectrometer, and about 220 million low-resolution blue and red prism photometer BP/RP mean spectra. The results of the analysis of epoch photometry are provided for some 10 million sources across 24 variability types. Gaia DR3 includes astrophysical parameters and source class probabilities for about 470 million and 1500 million sources, respectively, including stars, galaxies, and quasars. Orbital elements and trend parameters are provided for some 800 000 astrometric, spectroscopic and eclipsing binaries. More than 150 000 Solar System objects, including new discoveries, with preliminary orbital solutions and individual epoch observations are part of this release. Reflectance spectra derived from the epoch BP/RP spectral data are published for about 60 000 asteroids. Finally, an additional data set is provided, namely the Gaia Andromeda Photometric Survey, consisting of the photometric time series for all sources located in a 5.5 degree radius field centred on the Andromeda galaxy. Conclusions. This data release represents a major advance with respect to Gaia DR2 and Gaia EDR3 because of the unprecedented quantity, quality, and variety of source astrophysical data. To date this is the largest collection of all-sky spectrophotometry, radial velocities, variables, and astrophysical parameters derived from both low- and high-resolution spectra and includes a spectrophotometric and dynamical survey of SSOs of the highest accuracy. The non-single star content surpasses the existing data by orders of magnitude. The quasar host and galaxy light profile collection is the first such survey that is all sky and space based. The astrophysical information provided in Gaia DR3 will unleash the full potential of Gaia’s exquisite astrometric, photometric, and radial velocity surveys.
E. T. Habtermariamand K. Kekebaand A. Troncosoand F. Martínez-Álvarez
A Cluster-Based Deep Learning Model for Energy Consumption Forecasting in Ethiopia Conference
SOCO 17th International Conference on Soft Computing Models in Industrial and Environmental Applications , vol. 531, Lecture Notes in Networks and Systems 2022.
Links | BibTeX | Tags: deep learning, energy, pattern recognition, time series
@conference{SOCO22_Ejigu,
title = {A Cluster-Based Deep Learning Model for Energy Consumption Forecasting in Ethiopia},
author = {E. T. Habtermariam and K. Kekeba and A. Troncoso and F. Martínez-Álvarez},
url = {https://link.springer.com/chapter/10.1007/978-3-031-18050-7_41},
year = {2022},
date = {2022-01-01},
booktitle = {SOCO 17th International Conference on Soft Computing Models in Industrial and Environmental Applications },
journal = {SOCO 17th International Conference on Soft Computing Models in Industrial and Environmental Applications, Lecture Notes in Networks Systems, Vol. 531.},
volume = {531},
pages = {423-432},
series = {Lecture Notes in Networks and Systems},
keywords = {deep learning, energy, pattern recognition, time series},
pubstate = {published},
tppubtype = {conference}
}
M. J. Jiménez-Navarroand M. Martínez-Ballesterosand I. S. Sousa Britoand F. Martínez-Álvarezand G. Asencio-Cortés
Feature-Aware Drop Layer (FADL): A Nonparametric Neural Network Layer for Feature Selection Conference
SOCO 17th International Conference on Soft Computing Models in Industrial and Environmental Applications, vol. 531, Lecture Notes in Networks Systems 2022.
Links | BibTeX | Tags: deep learning, feature selection
@conference{FADL23,
title = {Feature-Aware Drop Layer (FADL): A Nonparametric Neural Network Layer for Feature Selection},
author = {M. J. Jiménez-Navarro and M. Martínez-Ballesteros and I. S. Sousa Brito and F. Martínez-Álvarez and G. Asencio-Cortés},
url = {https://link.springer.com/chapter/10.1007/978-3-031-18050-7_54},
year = {2022},
date = {2022-01-01},
booktitle = {SOCO 17th International Conference on Soft Computing Models in Industrial and Environmental Applications},
volume = {531},
pages = {557-566},
series = {Lecture Notes in Networks Systems},
keywords = {deep learning, feature selection},
pubstate = {published},
tppubtype = {conference}
}
L. Melgar-Garcíaand D. Gutiérrez-Avilésand C. Rubio-Escuderoand A. Troncoso
Nearest neighbors with incremental learning for real-time forecasting of electricity demand Conference
IEEE International Conference on Data Mining Workshops, 2022.
Links | BibTeX | Tags: energy, IoT, time series
@conference{MelgarICDM2022,
title = {Nearest neighbors with incremental learning for real-time forecasting of electricity demand},
author = {L. Melgar-García and D. Gutiérrez-Avilés and C. Rubio-Escudero and A. Troncoso},
url = {https://ieeexplore.ieee.org/document/10031211},
year = {2022},
date = {2022-01-01},
booktitle = {IEEE International Conference on Data Mining Workshops},
keywords = {energy, IoT, time series},
pubstate = {published},
tppubtype = {conference}
}
2021
K.-T. T. Buiand J. F. Torresand D. Gutiérrez-Avilésand V. H. Nhuand F. Martínez-Álvarezand D. T. Bui
In: Computer-Aided Civil and Infrastructure Engineering, vol. 37, pp. 1368-1386, 2021.
Abstract | Links | BibTeX | Tags: deep learning, time series
@article{BUI22b,
title = {Deformation forecasting of a hydropower dam by hybridizing a Long Short-Term Memory deep learning network with the Coronavirus Optimization Algorithm},
author = {K.-T. T. Bui and J. F. Torres and D. Gutiérrez-Avilés and V. H. Nhu and F. Martínez-Álvarez and D. T. Bui},
url = {https://onlinelibrary.wiley.com/doi/abs/10.1111/mice.12810},
doi = {https://doi.org/10.1111/mice.12810},
year = {2021},
date = {2021-11-24},
journal = {Computer-Aided Civil and Infrastructure Engineering},
volume = {37},
pages = {1368-1386},
abstract = {The safety operation and management of hydropower dam play a critical role in social-economic development and ensure people's safety in many countries; therefore, modeling and forecasting the hydropower dam's deformations with high accuracy is crucial. This research aims to propose and validate a new model based on deep learning long short-term memory (LSTM) and the coronavirus optimization algorithm (CVOA), named CVOA-LSTM, for forecasting the deformations of the hydropower dam. The second-largest hydropower dam of Vietnam, located in the Hoa Binh province, is focused. Herein, we used the LSTM to establish the deformation model, whereas the CVOA was utilized to optimize the three parameters of the LSTM, the number of hidden layers, the learning rate, and the dropout. The efficacy of the proposed CVOA-LSTM model is assessed by comparing its forecasting performance with state-of-the-art benchmarks, sequential minimal optimization for support vector regression, Gaussian process, M5' model tree, multilayer perceptron neural network, reduced error pruning tree, random tree, random forest, and radial basis function neural network. The result shows that the proposed CVOA-LSTM model has high forecasting capability (R2 = 0.874, root mean square error = 0.34, mean absolute error = 0.23) and outperforms the benchmarks. We conclude that CVOA-LSTM is a new tool that can be considered to forecast the hydropower dam's deformations.},
keywords = {deep learning, time series},
pubstate = {published},
tppubtype = {article}
}
The safety operation and management of hydropower dam play a critical role in social-economic development and ensure people's safety in many countries; therefore, modeling and forecasting the hydropower dam's deformations with high accuracy is crucial. This research aims to propose and validate a new model based on deep learning long short-term memory (LSTM) and the coronavirus optimization algorithm (CVOA), named CVOA-LSTM, for forecasting the deformations of the hydropower dam. The second-largest hydropower dam of Vietnam, located in the Hoa Binh province, is focused. Herein, we used the LSTM to establish the deformation model, whereas the CVOA was utilized to optimize the three parameters of the LSTM, the number of hidden layers, the learning rate, and the dropout. The efficacy of the proposed CVOA-LSTM model is assessed by comparing its forecasting performance with state-of-the-art benchmarks, sequential minimal optimization for support vector regression, Gaussian process, M5' model tree, multilayer perceptron neural network, reduced error pruning tree, random tree, random forest, and radial basis function neural network. The result shows that the proposed CVOA-LSTM model has high forecasting capability (R2 = 0.874, root mean square error = 0.34, mean absolute error = 0.23) and outperforms the benchmarks. We conclude that CVOA-LSTM is a new tool that can be considered to forecast the hydropower dam's deformations.
R. Scitovskiand K. Saboand F. Martínez-Álvarezand S. Ungar
Cluster analysis and applications Book
Springer, 2021, ISBN: 978-3-030-74551-6.
Abstract | Links | BibTeX | Tags: pattern recognition
@book{SCITOVSKI21,
title = {Cluster analysis and applications},
author = {R. Scitovski and K. Sabo and F. Martínez-Álvarez and S. Ungar},
url = {https://www.springer.com/gp/book/9783030745516},
doi = {10.1007/978-3-030-74552-3 tppubtype = book},
isbn = {978-3-030-74551-6},
year = {2021},
date = {2021-09-26},
publisher = {Springer},
abstract = {With the development of Big Data platforms for managing massive amount of data and wide availability of tools for processing these data, the biggest limitation is the lack of trained experts who are qualified to process and interpret the results. This textbook is intended for graduate students and experts using methods of cluster analysis and applications in various fields. Suitable for an introductory course on cluster analysis or data mining, with an in-depth mathematical treatment that includes discussions on different measures, primitives (points, lines, etc.) and optimization-based clustering methods, Cluster Analysis and Applications also includes coverage of deep learning based clustering methods. With clear explanations of ideas and precise definitions of concepts, accompanied by numerous examples and exercises together with Mathematica programs and modules, Cluster Analysis and Applications may be used by students and researchers in various disciplines, working in data analysis or data science.},
keywords = {pattern recognition},
pubstate = {published},
tppubtype = {book}
}
With the development of Big Data platforms for managing massive amount of data and wide availability of tools for processing these data, the biggest limitation is the lack of trained experts who are qualified to process and interpret the results. This textbook is intended for graduate students and experts using methods of cluster analysis and applications in various fields. Suitable for an introductory course on cluster analysis or data mining, with an in-depth mathematical treatment that includes discussions on different measures, primitives (points, lines, etc.) and optimization-based clustering methods, Cluster Analysis and Applications also includes coverage of deep learning based clustering methods. With clear explanations of ideas and precise definitions of concepts, accompanied by numerous examples and exercises together with Mathematica programs and modules, Cluster Analysis and Applications may be used by students and researchers in various disciplines, working in data analysis or data science.
J. F. Torresand M. J. Jiménez-Navarroand F. Martínez-Álvarezand A. Troncoso
Electricity consumption time series forecasting using Temporal Convolutional Networks Conference
CAEPIA Conference of the Spanish Association for Artificial Intelligence , Lecture Notes in Artificial Intelligence 2021.
BibTeX | Tags: deep learning, time series
@conference{TORRES21b,
title = {Electricity consumption time series forecasting using Temporal Convolutional Networks},
author = {J. F. Torres and M. J. Jiménez-Navarro and F. Martínez-Álvarez and A. Troncoso},
year = {2021},
date = {2021-09-01},
booktitle = {CAEPIA Conference of the Spanish Association for Artificial Intelligence },
series = {Lecture Notes in Artificial Intelligence},
keywords = {deep learning, time series},
pubstate = {published},
tppubtype = {conference}
}
A. Melaraand J. F. Torresand A. Troncosoand F. Martínez-Álvarez
SOCO International Conference on Soft Computing Models in Industrial and Environmental Applications, vol. 1401, Advances in Intelligent Systems and Computing 2021.
Links | BibTeX | Tags: deep learning, energy, time series
@conference{MELARA21,
title = {Electricity Generation Forecasting in Concentrating Solar-Thermal Power Plants with Ensemble Learning},
author = {A. Melara and J. F. Torres and A. Troncoso and F. Martínez-Álvarez},
doi = {https://doi.org/10.1007/978-3-030-87869-6_63},
year = {2021},
date = {2021-09-01},
booktitle = {SOCO International Conference on Soft Computing Models in Industrial and Environmental Applications},
volume = {1401},
pages = {665-674},
series = {Advances in Intelligent Systems and Computing},
keywords = {deep learning, energy, time series},
pubstate = {published},
tppubtype = {conference}
}
D. Hadjoutand J. F. Torresand A. Sebaaand F. Martínez-Álvarez
SOCO International Conference on Soft Computing Models in Industrial and Environmental Applications, vol. 1401, Advances in Intelligent Systems and Computing 2021.
Links | BibTeX | Tags: deep learning, energy, time series
@conference{HADJOUT21,
title = {Medium-Term Electricity Consumption Forecasting in Algeria Based on Clustering, Deep Learning and Bayesian Optimization Methods},
author = {D. Hadjout and J. F. Torres and A. Sebaa and F. Martínez-Álvarez},
doi = {https://doi.org/10.1007/978-3-030-87869-6_70},
year = {2021},
date = {2021-09-01},
booktitle = {SOCO International Conference on Soft Computing Models in Industrial and Environmental Applications},
volume = {1401},
pages = {739-748},
series = {Advances in Intelligent Systems and Computing},
keywords = {deep learning, energy, time series},
pubstate = {published},
tppubtype = {conference}
}
M. J. Jiménez-Navarroand F. Martínez-Álvarezand A. Troncosoand G. Asencio-Cortés
HLNet: A Novel Hierarchical Deep Neural Network for Time Series Forecasting Conference
SOCO International Conference on Soft Computing Models in Industrial and Environmental Applications, vol. 1401, Advances in Intelligent Systems and Computing 2021.
Links | BibTeX | Tags: deep learning, time series
@conference{JIMENEZ-NAVARRO21,
title = {HLNet: A Novel Hierarchical Deep Neural Network for Time Series Forecasting},
author = {M. J. Jiménez-Navarro and F. Martínez-Álvarez and A. Troncoso and G. Asencio-Cortés},
doi = {https://doi.org/10.1007/978-3-030-87869-6_68},
year = {2021},
date = {2021-09-01},
booktitle = {SOCO International Conference on Soft Computing Models in Industrial and Environmental Applications},
volume = {1401},
pages = {717-727},
series = {Advances in Intelligent Systems and Computing},
keywords = {deep learning, time series},
pubstate = {published},
tppubtype = {conference}
}
M. A. Molinaand M. J. Jiménez-Navarroand F. Martínez-Álvarezand G. Asencio-Cortés
A Model-Based Deep Transfer Learning Algorithm for Phenology Forecasting Using Satellite Imagery Conference
HAIS 16th International Conference on Hybrid Artificial Intelligence Systems, vol. 12886, Lecture Notes in Computer Science 2021.
Links | BibTeX | Tags: deep learning, time series
@conference{MOLINA21,
title = {A Model-Based Deep Transfer Learning Algorithm for Phenology Forecasting Using Satellite Imagery},
author = {M. A. Molina and M. J. Jiménez-Navarro and F. Martínez-Álvarez and G. Asencio-Cortés},
url = {https://link.springer.com/chapter/10.1007/978-3-030-86271-8_43},
doi = {https://doi.org/10.1007/978-3-030-86271-8_43},
year = {2021},
date = {2021-09-01},
booktitle = {HAIS 16th International Conference on Hybrid Artificial Intelligence Systems},
volume = {12886},
pages = {511-523},
series = {Lecture Notes in Computer Science},
keywords = {deep learning, time series},
pubstate = {published},
tppubtype = {conference}
}
A. Morales-Estebanand F. Martínez-Álvarezand S. Scitovskiand R. Scitovski
Mahalanobis clustering for the determination of incidence-magnitude seismic parameters for the Iberian Peninsula and the Republic of Croatia Journal Article
In: Computers and Geosciences, vol. 156, pp. 104873, 2021.
Abstract | Links | BibTeX | Tags: natural disasters, pattern recognition
@article{MORALES21,
title = {Mahalanobis clustering for the determination of incidence-magnitude seismic parameters for the Iberian Peninsula and the Republic of Croatia},
author = {A. Morales-Esteban and F. Martínez-Álvarez and S. Scitovski and R. Scitovski},
url = {https://www.sciencedirect.com/science/article/pii/S0098300421001667},
doi = {https://doi.org/10.1016/j.cageo.2021.104873},
year = {2021},
date = {2021-07-09},
journal = {Computers and Geosciences},
volume = {156},
pages = {104873},
abstract = {The aim of this paper is to analyse the seismic activity of the Iberian Peninsula and a wide area of the Republicof Croatia. To do so, two incidence-magnitude seismic parameters have been defined. First, the areas have beendivided into several ellipsoidal clusters using Mahalanobis clustering. Four generalised indexes (Mahalanobis Calinski Harabasz, Mahalanobis Davies–Bouldin, Mahalanobis Simplified Silhouette Width Criterion and Mahalanobis Area) have been used to determine the most appropriate number of ellipsoidal clusters, on the basis of which a partition with four and a partition with eleven clusters have been considered. For the widearea of the Republic of Croatia there are fourteen clusters and the five areas that just affect Croatia have been analysed in detail. Then, to analyse the seismic activity of the areas, two incidence-magnitude seismic parameters have been defined and calculated: a) 𝛥(4), that represents the minimal number of successive years in which at least one earthquake of magnitude between 4 and 5 has been registered; b) 𝛥(5), that shows the number of years in which at least one earthquake of magnitude larger than 5 occurred. The calculation of 𝛥(4) for the South-west and the South-east of the Iberian Peninsula has provided two years for both. Regarding 𝛥(5), 10 and 12 years have been obtained for the South-west and the South-east of the Iberian Peninsula,respectively. The analysis of Croatia has shown that the Ston–Metković area has the highest seismic activity. The following results have been determined: 5 years for 𝛥(4) and 22 for 𝛥(5). It should be mentioned that the seresults cannot be used for predicting earthquakes. However, data about the incidences of earthquake events and their magnitudes can certainly serve as useful information in civil engineering.},
keywords = {natural disasters, pattern recognition},
pubstate = {published},
tppubtype = {article}
}
The aim of this paper is to analyse the seismic activity of the Iberian Peninsula and a wide area of the Republicof Croatia. To do so, two incidence-magnitude seismic parameters have been defined. First, the areas have beendivided into several ellipsoidal clusters using Mahalanobis clustering. Four generalised indexes (Mahalanobis Calinski Harabasz, Mahalanobis Davies–Bouldin, Mahalanobis Simplified Silhouette Width Criterion and Mahalanobis Area) have been used to determine the most appropriate number of ellipsoidal clusters, on the basis of which a partition with four and a partition with eleven clusters have been considered. For the widearea of the Republic of Croatia there are fourteen clusters and the five areas that just affect Croatia have been analysed in detail. Then, to analyse the seismic activity of the areas, two incidence-magnitude seismic parameters have been defined and calculated: a) 𝛥(4), that represents the minimal number of successive years in which at least one earthquake of magnitude between 4 and 5 has been registered; b) 𝛥(5), that shows the number of years in which at least one earthquake of magnitude larger than 5 occurred. The calculation of 𝛥(4) for the South-west and the South-east of the Iberian Peninsula has provided two years for both. Regarding 𝛥(5), 10 and 12 years have been obtained for the South-west and the South-east of the Iberian Peninsula,respectively. The analysis of Croatia has shown that the Ston–Metković area has the highest seismic activity. The following results have been determined: 5 years for 𝛥(4) and 22 for 𝛥(5). It should be mentioned that the seresults cannot be used for predicting earthquakes. However, data about the incidences of earthquake events and their magnitudes can certainly serve as useful information in civil engineering.
M. García-Torresand F. Gómez-Velaand F. Divinaand D.P. Pinto-Roaand J.L. Vázquez Nogueraand J.C. Román
Scatter search for high-dimensional feature selection using feature grouping Conference
GECCO Genetic and Evolutionary Computation Conference, 2021.
Links | BibTeX | Tags: big data, feature selection, pattern recognition
@conference{garcia2021scatter,
title = {Scatter search for high-dimensional feature selection using feature grouping},
author = {M. García-Torres and F. Gómez-Vela and F. Divina and D.P. Pinto-Roa and J.L. Vázquez Noguera and J.C. Román},
doi = {10.1145/3449726.3459481 pages=149--150},
year = {2021},
date = {2021-07-01},
booktitle = {GECCO Genetic and Evolutionary Computation Conference},
keywords = {big data, feature selection, pattern recognition},
pubstate = {published},
tppubtype = {conference}
}
J. F. Torresand D. Hadjoutand A. Sebaaand F. Martínez-Álvarezand A. Troncoso
Deep Learning for Time Series Forecasting: A Survey Journal Article
In: Big Data, vol. 9, no. 1, pp. 3-21, 2021.
Abstract | Links | BibTeX | Tags: big data, deep learning, time series
@article{TORRES21,
title = {Deep Learning for Time Series Forecasting: A Survey},
author = {J. F. Torres and D. Hadjout and A. Sebaa and F. Martínez-Álvarez and A. Troncoso},
url = {https://www.liebertpub.com/doi/10.1089/big.2020.0159},
doi = {10.1089/big.2020.0159},
year = {2021},
date = {2021-02-05},
journal = {Big Data},
volume = {9},
number = {1},
pages = {3-21},
abstract = {Deep learning, one of the most remarkable techniques of machine learning, has been a major success in many fields, including image processing, speech recognition, and text understanding. It is powerful engines capable of learning arbitrary mapping functions, not require a scaled or stationary time series as input, support multivariate inputs, and support multi-step outputs. All of these features together make deep learning useful tools when dealing with more complex time series prediction problems involving large amounts of data, and multiple variables with complex relationships. This paper provides an overview of the most common Deep Learning types for time series forecasting, Explain the relationships between deep learning models and classical approaches to time series forecasting. A brief background of the particular challenges presents in time-series data and the most common deep learning techniques that are often used for time series forecasting is provided. Previous studies that applied deep learning to time series are reviewed.},
keywords = {big data, deep learning, time series},
pubstate = {published},
tppubtype = {article}
}
Deep learning, one of the most remarkable techniques of machine learning, has been a major success in many fields, including image processing, speech recognition, and text understanding. It is powerful engines capable of learning arbitrary mapping functions, not require a scaled or stationary time series as input, support multivariate inputs, and support multi-step outputs. All of these features together make deep learning useful tools when dealing with more complex time series prediction problems involving large amounts of data, and multiple variables with complex relationships. This paper provides an overview of the most common Deep Learning types for time series forecasting, Explain the relationships between deep learning models and classical approaches to time series forecasting. A brief background of the particular challenges presents in time-series data and the most common deep learning techniques that are often used for time series forecasting is provided. Previous studies that applied deep learning to time series are reviewed.
R. Mortazaviand S. Mortazaviand A. Troncoso
Wrapper-based feature selection using regression trees to predict intrinsic viscosity of polymer Journal Article
In: Engineering with Computers, 2021.
Abstract | Links | BibTeX | Tags: feature selection
@article{Mortazavi21,
title = {Wrapper-based feature selection using regression trees to predict intrinsic viscosity of polymer},
author = {R. Mortazavi and S. Mortazavi and A. Troncoso},
url = {https://link.springer.com/article/10.1007/s00366-020-01226-1},
doi = {10.1007/s00366-020-01226-1},
year = {2021},
date = {2021-01-01},
journal = {Engineering with Computers},
abstract = {This paper introduces different types of regression trees for viscosity property forecasting in polymer solutions. Although regression trees have been extensively used in other fields, they do not have been explored to predict the viscosity. One key issue in the context of materials science is to determine a priori which characteristics must be included to describe the prediction model due to a large number of molecular descriptors is obtained. To deal with this, we propose a wrapper method to select the features based on regression trees. Thus, we use regression trees to evaluate different subsets of attributes and build a model from the subset of features that achieved the minimum error. In particular, the performance of eight regression tree algorithms, including both linear and non-linear models, is evaluated and compared to other forecasting approaches using a dataset composed of 64 polymers and 2962 molecular descriptors. The results show that regression trees with nearest neighbors based local models in leaves predict with high accuracy. Moreover, results have been compared to other forecasting approaches such as multivariate linear regression, neural networks and support vector machines showing remarkable improvements in terms of accuracy.},
keywords = {feature selection},
pubstate = {published},
tppubtype = {article}
}
This paper introduces different types of regression trees for viscosity property forecasting in polymer solutions. Although regression trees have been extensively used in other fields, they do not have been explored to predict the viscosity. One key issue in the context of materials science is to determine a priori which characteristics must be included to describe the prediction model due to a large number of molecular descriptors is obtained. To deal with this, we propose a wrapper method to select the features based on regression trees. Thus, we use regression trees to evaluate different subsets of attributes and build a model from the subset of features that achieved the minimum error. In particular, the performance of eight regression tree algorithms, including both linear and non-linear models, is evaluated and compared to other forecasting approaches using a dataset composed of 64 polymers and 2962 molecular descriptors. The results show that regression trees with nearest neighbors based local models in leaves predict with high accuracy. Moreover, results have been compared to other forecasting approaches such as multivariate linear regression, neural networks and support vector machines showing remarkable improvements in terms of accuracy.
L. Melgar-Garcíaand D. Gutiérrez-Avilésand C. Rubio-Escuderoand A. Troncoso
Discovering three-dimensional patterns in real-time from data streams: An online triclustering approach Journal Article
In: Information Sciences, vol. 558, pp. 174-193, 2021.
Abstract | Links | BibTeX | Tags: big data, IoT, pattern recognition
@article{Melgar21_IS,
title = {Discovering three-dimensional patterns in real-time from data streams: An online triclustering approach},
author = {L. Melgar-García and D. Gutiérrez-Avilés and C. Rubio-Escudero and A. Troncoso},
url = {https://www.sciencedirect.com/science/article/pii/S0020025521000220},
doi = {10.1016/j.ins.2020.12.089},
year = {2021},
date = {2021-01-01},
journal = {Information Sciences},
volume = {558},
pages = {174-193},
abstract = {Triclustering algorithms group sets of coordinates of 3-dimensional datasets. In this paper, a new triclustering approach for data streams is introduced. It follows a streaming scheme of learning in two steps: offline and online phases. First, the offline phase provides a summary model with the components of the triclusters. Then, the second stage is the online phase to deal with data in streaming. This online phase consists in using the summary model obtained in the offline stage to update the triclusters as fast as possible with genetic operators. Results using three types of synthetic datasets and a real-world environmental sensor dataset are reported. The performance of the proposed triclustering streaming algorithm is compared to a batch triclustering algorithm, showing an accurate performance both in terms of quality and running times.
},
keywords = {big data, IoT, pattern recognition},
pubstate = {published},
tppubtype = {article}
}
Triclustering algorithms group sets of coordinates of 3-dimensional datasets. In this paper, a new triclustering approach for data streams is introduced. It follows a streaming scheme of learning in two steps: offline and online phases. First, the offline phase provides a summary model with the components of the triclusters. Then, the second stage is the online phase to deal with data in streaming. This online phase consists in using the summary model obtained in the offline stage to update the triclusters as fast as possible with genetic operators. Results using three types of synthetic datasets and a real-world environmental sensor dataset are reported. The performance of the proposed triclustering streaming algorithm is compared to a batch triclustering algorithm, showing an accurate performance both in terms of quality and running times.
A. R. Troncoso-Garcíaand J. A. Ortegaand R. Seepoldand N. Martínez-Madrid
Non-invasive devices for respiratory sound monitoring Conference
KES International Conference on Knowledge Based and Intelligent information and Engineering Systems, 2021.
@conference{TRONCOSO-GARCIA21,
title = {Non-invasive devices for respiratory sound monitoring},
author = {A. R. Troncoso-García and J. A. Ortega and R. Seepold and N. Martínez-Madrid},
url = {https://www.sciencedirect.com/science/article/pii/S1877050921018135},
doi = {https://doi.org/10.1016/j.procs.2021.09.076},
year = {2021},
date = {2021-01-01},
booktitle = {KES International Conference on Knowledge Based and Intelligent information and Engineering Systems},
pages = {3040-3048},
keywords = {IoT},
pubstate = {published},
tppubtype = {conference}
}
A. J. Pérez-Pulidoand G. Asencio-Cortésand A. M. Brokate-Llanosand G. Brea-Calvoand M. R. Rodríguez-Griñoloand A. Garzónand M. J. Muñoz
In: Briefings in Bioinformatics, vol. 22, no. 2, pp. 1038–1052, 2021.
Abstract | Links | BibTeX | Tags: bioinformatics
@article{pulido2021,
title = {Serial co-expression analysis of host factors from SARS-CoV viruses highly converges with former high-throughput screenings and proposes key regulators},
author = {A. J. Pérez-Pulido and G. Asencio-Cortés and A. M. Brokate-Llanos and G. Brea-Calvo and M. R. Rodríguez-Griñolo and A. Garzón and M. J. Muñoz},
url = {https://academic.oup.com/bib/article/22/2/1038/6103172},
doi = {10.1093/bib/bbaa419},
year = {2021},
date = {2021-01-01},
journal = {Briefings in Bioinformatics},
volume = {22},
number = {2},
pages = {1038--1052},
abstract = {The current genomics era is bringing an unprecedented growth in the amount of gene expression data, only comparable to the exponential growth of sequences in databases during the last decades. This data allow the design of secondary analyses that take advantage of this information to create new knowledge. One of these feasible analyses is the evaluation of the expression level for a gene through a series of different conditions or cell types. Based on this idea, we have developed Automatic and Serial Analysis of CO-expression, which performs expression profiles for a given gene along hundreds of heterogeneous and normalized transcriptomics experiments and discover other genes that show either a similar or an inverse behavior. It might help to discover co-regulated genes, and common transcriptional regulators in any biological model. The present severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) pandemic is an opportunity to test this novel approach due to the wealth of data that are being generated, which could be used for validating results. Thus, we have identified 35 host factors in the literature putatively involved in the infectious cycle of SARS-CoV viruses and searched for genes tightly co-expressed with them. We have found 1899 co-expressed genes whose assigned functions are strongly related to viral cycles. Moreover, this set of genes heavily overlaps with those identified by former laboratory.},
keywords = {bioinformatics},
pubstate = {published},
tppubtype = {article}
}
The current genomics era is bringing an unprecedented growth in the amount of gene expression data, only comparable to the exponential growth of sequences in databases during the last decades. This data allow the design of secondary analyses that take advantage of this information to create new knowledge. One of these feasible analyses is the evaluation of the expression level for a gene through a series of different conditions or cell types. Based on this idea, we have developed Automatic and Serial Analysis of CO-expression, which performs expression profiles for a given gene along hundreds of heterogeneous and normalized transcriptomics experiments and discover other genes that show either a similar or an inverse behavior. It might help to discover co-regulated genes, and common transcriptional regulators in any biological model. The present severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) pandemic is an opportunity to test this novel approach due to the wealth of data that are being generated, which could be used for validating results. Thus, we have identified 35 host factors in the literature putatively involved in the infectious cycle of SARS-CoV viruses and searched for genes tightly co-expressed with them. We have found 1899 co-expressed genes whose assigned functions are strongly related to viral cycles. Moreover, this set of genes heavily overlaps with those identified by former laboratory.
J. Roiz-Pagadorand A. M. Chacon-Maldonadoand R. Ruizand G. Asencio-Cortes
Earthquake Prediction in California using Feature Selection techniques Conference
SOCO 16th International Conference on Soft Computing Models in Industrial and Environmental Applications, Advances in Intelligent Systems and Computing 2021.
Links | BibTeX | Tags: feature selection, natural disasters, time series
@conference{roiz2022,
title = {Earthquake Prediction in California using Feature Selection techniques},
author = {J. Roiz-Pagador and A. M. Chacon-Maldonado and R. Ruiz and G. Asencio-Cortes},
url = {https://link.springer.com/chapter/10.1007/978-3-030-87869-6_69},
year = {2021},
date = {2021-01-01},
booktitle = {SOCO 16th International Conference on Soft Computing Models in Industrial and Environmental Applications},
series = {Advances in Intelligent Systems and Computing},
keywords = {feature selection, natural disasters, time series},
pubstate = {published},
tppubtype = {conference}
}
S.A. Grilloand J.C. Románand J.D. Mello-Románand J.L. Vázquez Nogueraand M. García-Torresand F. Divinaand P.E. Sotomayor
Adjacent Inputs With Different Labels and Hardness in Supervised Learning Journal Article
In: IEEE Access, pp. 162487–162498, 2021.
Links | BibTeX | Tags: feature selection, pattern recognition
@article{grillo2021adjacent,
title = {Adjacent Inputs With Different Labels and Hardness in Supervised Learning},
author = {S.A. Grillo and J.C. Román and J.D. Mello-Román and J.L. Vázquez Noguera and M. García-Torres and F. Divina and P.E. Sotomayor},
doi = {10.1109/ACCESS.2021.3131150 volume=9},
year = {2021},
date = {2021-01-01},
journal = {IEEE Access},
pages = {162487--162498},
publisher = {IEEE pubstate = published},
keywords = {feature selection, pattern recognition},
pubstate = {published},
tppubtype = {article}
}
R. Parraand V. Ojedaand J.L. Vázquez Nogueraand M. García-Torresand J.C. Mello-Románand C. Villalbaand J. Faconand F. Divinaand O. Cardozoand V. Castillo
A Trust-Based Methodology to Evaluate Deep Learning Models for Automatic Diagnosis of Ocular Toxoplasmosis from Fundus Images Journal Article
In: Diagnostics, vol. 11, no. 11, pp. 1951, 2021.
Links | BibTeX | Tags: bioinformatics, deep learning, pattern recognition
@article{parra2021trust,
title = {A Trust-Based Methodology to Evaluate Deep Learning Models for Automatic Diagnosis of Ocular Toxoplasmosis from Fundus Images},
author = {R. Parra and V. Ojeda and J.L. Vázquez Noguera and M. García-Torres and J.C. Mello-Román and C. Villalba and J. Facon and F. Divina and O. Cardozo and V. Castillo},
doi = {10.3390/diagnostics11111951},
year = {2021},
date = {2021-01-01},
journal = {Diagnostics},
volume = {11},
number = {11},
pages = {1951},
publisher = {Multidisciplinary Digital Publishing Institute pubstate = published},
keywords = {bioinformatics, deep learning, pattern recognition},
pubstate = {published},
tppubtype = {article}
}
J. Ayalaand M. García-Torresand J.L. Vázquez Nogueraand F. Gómez-Velaand F. Divina
Technical analysis strategy optimization using a machine learning approach in stock market indices Journal Article
In: Knowledge-Based Systems, pp. 107119, 2021.
Links | BibTeX | Tags: deep learning, pattern recognition
@article{ayala2021technical,
title = {Technical analysis strategy optimization using a machine learning approach in stock market indices},
author = {J. Ayala and M. García-Torres and J.L. Vázquez Noguera and F. Gómez-Vela and F. Divina},
doi = {10.1016/j.knosys.2021.107119 volume=225},
year = {2021},
date = {2021-01-01},
journal = {Knowledge-Based Systems},
pages = {107119},
publisher = {Elsevier pubstate = published},
keywords = {deep learning, pattern recognition},
pubstate = {published},
tppubtype = {article}
}
P.M. Martínez-Garcíaand M. García-Torresand F. Divinaand J. Terrón-Bautistaand I. Delgado-Sainzand F. Gómez-Velaand F. Cortés-Ledesma
Genome-wide prediction of topoisomerase II $beta$ binding by architectural factors and chromatin accessibility Journal Article
In: PLoS computational biology, vol. 17, no. 1, pp. e1007814, 2021.
Links | BibTeX | Tags: bioinformatics
@article{martinez2021genome,
title = {Genome-wide prediction of topoisomerase II $beta$ binding by architectural factors and chromatin accessibility},
author = {P.M. Martínez-García and M. García-Torres and F. Divina and J. Terrón-Bautista and I. Delgado-Sainz and F. Gómez-Vela and F. Cortés-Ledesma},
doi = {10.1371/journal.pcbi.1007814},
year = {2021},
date = {2021-01-01},
journal = {PLoS computational biology},
volume = {17},
number = {1},
pages = {e1007814},
publisher = {Public Library of Science San Francisco, CA USA pubstate = published},
keywords = {bioinformatics},
pubstate = {published},
tppubtype = {article}
}
A. Lopez-Fernandezand D. Rodriguez-Baenaand F. Gomez-Velaand F. Divinaand M. Garcia-Torres
A multi-GPU biclustering algorithm for binary datasets Journal Article
In: Journal of Parallel and Distributed Computing, vol. 147, pp. 209–219, 2021.
Links | BibTeX | Tags: bioinformatics, pattern recognition
@article{lopez2021multi,
title = {A multi-GPU biclustering algorithm for binary datasets},
author = {A. Lopez-Fernandez and D. Rodriguez-Baena and F. Gomez-Vela and F. Divina and M. Garcia-Torres},
doi = {10.1016/j.jpdc.2020.09.009},
year = {2021},
date = {2021-01-01},
journal = {Journal of Parallel and Distributed Computing},
volume = {147},
pages = {209--219},
publisher = {Elsevier pubstate = published},
keywords = {bioinformatics, pattern recognition},
pubstate = {published},
tppubtype = {article}
}
V.E. Castillo Benítezand I. Castro Mattoand J.C. Mello Románand J.L. Vázquez Nogueraand M. García-Torresand J. Ayalaand D.P. Pinto-Roaand P.E. Gardel-Sotomayorand J. Faconand S.A. Grillo
Dataset from fundus images for the study of diabetic retinopathy Journal Article
In: Data in Brief, vol. 36, pp. 107068, 2021.
Abstract | Links | BibTeX | Tags: bioinformatics
@article{benitez2021dataset,
title = {Dataset from fundus images for the study of diabetic retinopathy},
author = {V.E. Castillo Benítez and I. Castro Matto and J.C. Mello Román and J.L. Vázquez Noguera and M. García-Torres and J. Ayala and D.P. Pinto-Roa and P.E. Gardel-Sotomayor and J. Facon and S.A. Grillo},
url = {https://www.sciencedirect.com/science/article/pii/S2352340921003528},
doi = {10.1016/j.dib.2021.107068},
year = {2021},
date = {2021-01-01},
journal = {Data in Brief},
volume = {36},
pages = {107068},
publisher = {Elsevier},
abstract = {This article presents a database containing 757 color fundus images acquired at the Department of Ophthalmology of the Hospital de Clínicas, Facultad de Ciencias Médicas (FCM), Universidad Nacional de Asunción (UNA), Paraguay. Firstly, the retinal images were acquired with a clinical procedure presented in this paper. The acquisition of the retinographies was made through the Visucam 500 camera of the Zeiss brand. Next, two expert ophthalmologists have classified the dataset. These data can help physicians and researchers in the detection of cases of Non-Proliferative Diabetic Retinopathy (NPDR) and Proliferative Diabetic Retinopathy (PDR), in their different stages. The dataset generated will be useful for ophthalmologists and researchers to work on automatic detection algorithms for Diabetic Retinopathy (DR).},
keywords = {bioinformatics},
pubstate = {published},
tppubtype = {article}
}
This article presents a database containing 757 color fundus images acquired at the Department of Ophthalmology of the Hospital de Clínicas, Facultad de Ciencias Médicas (FCM), Universidad Nacional de Asunción (UNA), Paraguay. Firstly, the retinal images were acquired with a clinical procedure presented in this paper. The acquisition of the retinographies was made through the Visucam 500 camera of the Zeiss brand. Next, two expert ophthalmologists have classified the dataset. These data can help physicians and researchers in the detection of cases of Non-Proliferative Diabetic Retinopathy (NPDR) and Proliferative Diabetic Retinopathy (PDR), in their different stages. The dataset generated will be useful for ophthalmologists and researchers to work on automatic detection algorithms for Diabetic Retinopathy (DR).
H. Ho Shinand C. Sauer Ayalaand P. Pérez-Estigarribiaand S.A. Grilloand L. Segovia-Cabreraand M. García-Torresand C. Gaonaand S. Iralaand M.E. Pedrozoand G. Sequeraand J.L. Vázquez Nogueraand E. De Los Santos
A Mathematical Model for COVID-19 with Variable Transmissibility and Hospitalizations: A Case Study in Paraguay Journal Article
In: Applied Sciences, vol. 11, no. 20, pp. 9726, 2021.
Abstract | Links | BibTeX | Tags: bioinformatics
@article{shin2021mathematical,
title = {A Mathematical Model for COVID-19 with Variable Transmissibility and Hospitalizations: A Case Study in Paraguay},
author = {H. Ho Shin and C. Sauer Ayala and P. Pérez-Estigarribia and S.A. Grillo and L. Segovia-Cabrera and M. García-Torres and C. Gaona and S. Irala and M.E. Pedrozo and G. Sequera and J.L. Vázquez Noguera and E. De Los Santos},
url = {https://www.mdpi.com/2076-3417/11/20/9726},
doi = {10.3390/app11209726},
year = {2021},
date = {2021-01-01},
journal = {Applied Sciences},
volume = {11},
number = {20},
pages = {9726},
publisher = {Multidisciplinary Digital Publishing Institute},
abstract = {Forecasting the dynamics of the number of cases with coronavirus disease 2019 (COVID-19) in a given population is a challenging task due to behavioural changes which occur over short periods. Planning of hospital resources and containment measures in the near term require a scenario analysis and the use of predictive models to gain insight into possible outcomes for each scenario. In this paper, we present the SEIR-H epidemiological model for the spread dynamics in a given population and the impact of COVID-19 in the local health system. It was developed as an extension of the classic SEIR model to account for required hospital resources and behavioural changes of the population in response to containment measures. Time-varying parameters such as transmissibility are estimated using Bayesian methods, based on the database of reported cases with a moving time-window strategy. The assessment of the model offers reasonable results with estimated parameters and simulations, reflecting the observed dynamics in Paraguay. The proposed model can be used to simulate future scenarios and possible effects of containment strategies, to guide the public institution response based on the available resources in the local health system.},
keywords = {bioinformatics},
pubstate = {published},
tppubtype = {article}
}
Forecasting the dynamics of the number of cases with coronavirus disease 2019 (COVID-19) in a given population is a challenging task due to behavioural changes which occur over short periods. Planning of hospital resources and containment measures in the near term require a scenario analysis and the use of predictive models to gain insight into possible outcomes for each scenario. In this paper, we present the SEIR-H epidemiological model for the spread dynamics in a given population and the impact of COVID-19 in the local health system. It was developed as an extension of the classic SEIR model to account for required hospital resources and behavioural changes of the population in response to containment measures. Time-varying parameters such as transmissibility are estimated using Bayesian methods, based on the database of reported cases with a moving time-window strategy. The assessment of the model offers reasonable results with estimated parameters and simulations, reflecting the observed dynamics in Paraguay. The proposed model can be used to simulate future scenarios and possible effects of containment strategies, to guide the public institution response based on the available resources in the local health system.
F. Divinaand F. Gómez-Velaand M. García-Torres
Advanced Optimization Methods and Big Data Applications in Energy Demand Forecast Journal Article
In: Applied Sciences, vol. 11, no. 3, pp. 1261, 2021.
@article{divina2021advanced,
title = {Advanced Optimization Methods and Big Data Applications in Energy Demand Forecast},
author = {F. Divina and F. Gómez-Vela and M. García-Torres},
url = {https://www.mdpi.com/2076-3417/11/3/1261/htm},
doi = {10.3390/app11031261},
year = {2021},
date = {2021-01-01},
journal = {Applied Sciences},
volume = {11},
number = {3},
pages = {1261},
publisher = {Multidisciplinary Digital Publishing Institute},
keywords = {energy},
pubstate = {published},
tppubtype = {article}
}
Gaia Collaborationand M. García-Torres
Gaia Early Data Release 3-Acceleration of the Solar System from Gaia astrometry Journal Article
In: Astronomy & Astrophysics, vol. 649, pp. A9, 2021.
Links | BibTeX | Tags: astrostatistics
@article{klioner2021gaia,
title = {Gaia Early Data Release 3-Acceleration of the Solar System from Gaia astrometry},
author = {Gaia Collaboration and M. García-Torres},
url = {https://www.aanda.org/articles/aa/full_html/2021/05/aa39734-20/aa39734-20.html},
doi = {10.1051/0004-6361/202039734},
year = {2021},
date = {2021-01-01},
journal = {Astronomy & Astrophysics},
volume = {649},
pages = {A9},
publisher = {EDP sciences},
keywords = {astrostatistics},
pubstate = {published},
tppubtype = {article}
}
Gaia Collaborationand M. García-Torres
Gaia Early Data Release 3-The Galactic anticentre Journal Article
In: Astronomy & Astrophysics, vol. 649, pp. A8, 2021.
Links | BibTeX | Tags: astrostatistics
@article{antoja2021gaia,
title = {Gaia Early Data Release 3-The Galactic anticentre},
author = {Gaia Collaboration and M. García-Torres},
url = {https://www.aanda.org/articles/aa/abs/2021/05/aa39714-20/aa39714-20.html},
doi = {10.1051/0004-6361/202039714},
year = {2021},
date = {2021-01-01},
journal = {Astronomy & Astrophysics},
volume = {649},
pages = {A8},
publisher = {EDP sciences},
keywords = {astrostatistics},
pubstate = {published},
tppubtype = {article}
}
A. GA. Brownand A. Vallenariand T. Prustiand JHJ. De Bruijneand C. Babusiauxand M. Biermannand OL. Creeveyand DW. Evansand L. Eyerand A. Huttonand M. García-Torresand others
Gaia Early Data Release 3-Summary of the contents and survey properties Journal Article
In: Astronomy & Astrophysics, vol. 649, pp. A1, 2021.
Links | BibTeX | Tags: astrostatistics
@article{brown2021gaia,
title = {Gaia Early Data Release 3-Summary of the contents and survey properties},
author = {A. GA. Brown and A. Vallenari and T. Prusti and JHJ. De Bruijne and C. Babusiaux and M. Biermann and OL. Creevey and DW. Evans and L. Eyer and A. Hutton and M. García-Torres and others},
url = {https://www.aanda.org/articles/aa/abs/2021/05/aa39657-20/aa39657-20.html},
doi = {10.1051/0004-6361/202039657},
year = {2021},
date = {2021-01-01},
journal = {Astronomy & Astrophysics},
volume = {649},
pages = {A1},
publisher = {EDP sciences},
keywords = {astrostatistics},
pubstate = {published},
tppubtype = {article}
}
Gaia Collaborationand M. García-Torres
Gaia Early Data Release 3-Structure and properties of the Magellanic Clouds Journal Article
In: Astronomy & Astrophysics, vol. 649, pp. A7, 2021.
Links | BibTeX | Tags: astrostatistics
@article{luri2021gaia,
title = {Gaia Early Data Release 3-Structure and properties of the Magellanic Clouds},
author = {Gaia Collaboration and M. García-Torres},
url = {https://www.aanda.org/articles/aa/abs/2021/05/aa39588-20/aa39588-20.html},
doi = {10.1051/0004-6361/202039588},
year = {2021},
date = {2021-01-01},
journal = {Astronomy & Astrophysics},
volume = {649},
pages = {A7},
publisher = {EDP sciences},
keywords = {astrostatistics},
pubstate = {published},
tppubtype = {article}
}
Gaia Collaborationand M. García-Torres
Gaia Early Data Release 3-The Gaia Catalogue of Nearby Stars Journal Article
In: Astronomy & Astrophysics, vol. 649, pp. A6, 2021.
Links | BibTeX | Tags: astrostatistics
@article{smart2021gaia,
title = {Gaia Early Data Release 3-The Gaia Catalogue of Nearby Stars},
author = {Gaia Collaboration and M. García-Torres},
url = {https://www.aanda.org/articles/aa/abs/2021/05/aa39498-20/aa39498-20.html},
doi = {https://doi.org/10.1051/0004-6361/202039498},
year = {2021},
date = {2021-01-01},
journal = {Astronomy & Astrophysics},
volume = {649},
pages = {A6},
publisher = {EDP sciences},
keywords = {astrostatistics},
pubstate = {published},
tppubtype = {article}
}
L. Melgar-Garcíaand D. Gutiérrez-Avilésand C. Rubio-Escuderoand A. Troncoso
Nearest neighbours-based forecasting for electricity demand time series in streaming Conference
CAEPIA Conference of the Spanish Association for Artificial Intelligence , Lecture Notes in Artificial Intelligence 2021.
Abstract | BibTeX | Tags: IoT, time series
@conference{CAEPIA21_Laura,
title = {Nearest neighbours-based forecasting for electricity demand time series in streaming},
author = {L. Melgar-García and D. Gutiérrez-Avilés and C. Rubio-Escudero and A. Troncoso },
year = {2021},
date = {2021-01-01},
booktitle = {CAEPIA Conference of the Spanish Association for Artificial Intelligence },
series = {Lecture Notes in Artificial Intelligence},
abstract = {This paper presents a forecasting algorithm for time series in streaming. The methodology has two well-differentiated stages: the algorithm searches for the nearest neighbors to generate an initial prediction model in the batch phase. Then, an online phase is carried out when the time series arrives in streaming. In particular, the nearest neighbor of the streaming data from the training set is computed and the nearest neighbors, previously computed in the batch phase, of this nearest neighbor are used to obtain the predictions. Results using the electricity consumption time series are reported, showing a remarkable performance of the proposed algorithm in terms of forecasting errors when compared to a nearest neighbors-based benchmark algorithm. The running times for the predictions are also remarkable.},
keywords = {IoT, time series},
pubstate = {published},
tppubtype = {conference}
}
This paper presents a forecasting algorithm for time series in streaming. The methodology has two well-differentiated stages: the algorithm searches for the nearest neighbors to generate an initial prediction model in the batch phase. Then, an online phase is carried out when the time series arrives in streaming. In particular, the nearest neighbor of the streaming data from the training set is computed and the nearest neighbors, previously computed in the batch phase, of this nearest neighbor are used to obtain the predictions. Results using the electricity consumption time series are reported, showing a remarkable performance of the proposed algorithm in terms of forecasting errors when compared to a nearest neighbors-based benchmark algorithm. The running times for the predictions are also remarkable.
F. Pietrapianaand J. M. Feria-Dominguezand A. Troncoso
Applying wrapper-based variable selection techniques to predict MFIs profitability: evidence from Peru Journal Article
In: Journal of Development Effectiveness, 2021.
Abstract | Links | BibTeX | Tags: feature selection
@article{JDE_Feria,
title = {Applying wrapper-based variable selection techniques to predict MFIs profitability: evidence from Peru},
author = {F. Pietrapiana and J. M. Feria-Dominguez and A. Troncoso},
doi = {10.1080/19439342.2021.1884119},
year = {2021},
date = {2021-01-01},
journal = {Journal of Development Effectiveness},
abstract = {In this paper, we analyse the main factors explaining the profitability (ROA) of Microfinance Institutions (MFIs) in Peru from 2011 to 2107. We apply three wrapper techniques to a sample of 168 Peruvians MFIs and 69 attributes obtained from MIX Market database. After running the algorithms M5ʹ, k nearest neighbours (KNN) and Random Forest, we find that the M5ʹ algorithm provides the best fit for predicting ROA. Particularly, the key variable of the regression tree is the percentage of expenses over assets and, depending on its value, it is followed by net income after taxes and before donations, or profit margins.},
keywords = {feature selection},
pubstate = {published},
tppubtype = {article}
}
In this paper, we analyse the main factors explaining the profitability (ROA) of Microfinance Institutions (MFIs) in Peru from 2011 to 2107. We apply three wrapper techniques to a sample of 168 Peruvians MFIs and 69 attributes obtained from MIX Market database. After running the algorithms M5ʹ, k nearest neighbours (KNN) and Random Forest, we find that the M5ʹ algorithm provides the best fit for predicting ROA. Particularly, the key variable of the regression tree is the percentage of expenses over assets and, depending on its value, it is followed by net income after taxes and before donations, or profit margins.
J. A. Gallardoand M. García-Torresand F. Gómez-Velaand F. Moralesand F. Divinaand D. Becerra-Alonsoand G. Velázquezand F. Daumas-Ladouceand J. L. Vázquez Nogueraand C. Ayala Sauer
Forecasting Electricity Consumption Data from Paraguay Using a Machine Learning Approach Conference
SOCO 16th International Conference on Soft Computing Models in Industrial and Environmental Applications, vol. 1401, Advances in Intelligent Systems and Computing 2021.
Links | BibTeX | Tags: big data, energy, time series
@conference{gallardo2022forecasting,
title = {Forecasting Electricity Consumption Data from Paraguay Using a Machine Learning Approach},
author = {J. A. Gallardo and M. García-Torres and F. Gómez-Vela and F. Morales and F. Divina and D. Becerra-Alonso and G. Velázquez and F. Daumas-Ladouce and J. L. Vázquez Noguera and C. Ayala Sauer},
url = {https://link.springer.com/chapter/10.1007/978-3-030-87869-6_65},
year = {2021},
date = {2021-01-01},
booktitle = {SOCO 16th International Conference on Soft Computing Models in Industrial and Environmental Applications},
volume = {1401},
pages = {685-694},
series = {Advances in Intelligent Systems and Computing},
keywords = {big data, energy, time series},
pubstate = {published},
tppubtype = {conference}
}
2020
P. Jiménez-Herreraand L. Melgar-Garcíaand G. Asencio-Cortésand A. Troncoso
A New Forecasting Algorithm Based on Neighbors for Streaming Electricity Time Series Conference
HAIS 15th International Conference on Hybrid Artificial Intelligence Systems, Lecture Notes in Computer Science 2020.
Links | BibTeX | Tags: big data, energy, IoT, time series
@conference{HAIS2020,
title = {A New Forecasting Algorithm Based on Neighbors for Streaming Electricity Time Series},
author = {P. Jiménez-Herrera and L. Melgar-García and G. Asencio-Cortés and A. Troncoso},
url = {https://link.springer.com/chapter/10.1007/978-3-030-61705-9_43},
year = {2020},
date = {2020-11-04},
booktitle = {HAIS 15th International Conference on Hybrid Artificial Intelligence Systems},
pages = {522-533},
series = {Lecture Notes in Computer Science},
keywords = {big data, energy, IoT, time series},
pubstate = {published},
tppubtype = {conference}
}