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645 results on '"Díaz, Guillermo A."'

1. Review of Distributed Quantum Computing. From single QPU to High Performance Quantum Computing

Author

Barral, David, Cardama, F. Javier, Díaz, Guillermo, Faílde, Daniel, Llovo, Iago F., Juane, Mariamo Mussa, Vázquez-Pérez, Jorge, Villasuso, Juan, Piñeiro, César, Costas, Natalia, Pichel, Juan C., Pena, Tomás F., and Gómez, Andrés

Subjects
Quantum Physics, Computer Science - Emerging Technologies
Abstract

The emerging field of quantum computing has shown it might change how we process information by using the unique principles of quantum mechanics. As researchers continue to push the boundaries of quantum technologies to unprecedented levels, distributed quantum computing raises as an obvious path to explore with the aim of boosting the computational power of current quantum systems. This paper presents a comprehensive survey of the current state of the art in the distributed quantum computing field, exploring its foundational principles, landscape of achievements, challenges, and promising directions for further research. From quantum communication protocols to entanglement-based distributed algorithms, each aspect contributes to the mosaic of distributed quantum computing, making it an attractive approach to address the limitations of classical computing. Our objective is to provide an exhaustive overview for experienced researchers and field newcomers.

Published
2024

2. CSI-Based Cross-Domain Activity Recognition via Zero-Shot Prototypical Networks

Author

Diaz, Guillermo, Sobron, Iker, Eizmendi, Inaki, Landa, Iratxe, and Velez, Manuel

Subjects
Electrical Engineering and Systems Science - Signal Processing
Abstract

The cross-domain capability of wireless sensing is currently one of the major challenges on human activity recognition (HAR) based on the channel state information (CSI) of wireless signals. The difficulty of labeling samples from new domains has encouraged the use of few and zero shot strategies. In this context, prototype networks have attracted attention due to their reasonable cross-domain transferability. This paper presents a novel zero-shot prototype recurrent convolutional network that implements a zero-shot learning strategy for HAR via CSI. This method extracts the prototypes from an available source domain to classify unseen and unlabeled data from the target domain for the same or similar classes. The experiments have been developed using three datasets with real measurements, and the results include an inter-datasets evaluation. Overall, the results improve the state of the art and make it a promising solution for cross-domain HAR.

Published
2023

4. Channel Phase Processing in Wireless Networks for Human Activity Recognition

Author

Diaz, Guillermo, Sobron, Iker, Eizmendi, Iñaki, landa, Iratxe, and Velez, Manuel

Subjects
Electrical Engineering and Systems Science - Signal Processing
Abstract

The phase of the channel state information (CSI) is underutilized as a source of information in wireless sensing due to its sensitivity to synchronization errors of the signal reception. A linear transformation of the phase is commonly applied to correct linear offsets and, in a few cases, some filtering in time or frequency is carried out to smooth the data. This paper presents a novel processing method of the CSI phase to improve the accuracy of human activity recognition (HAR) in indoor environments. This new method, coined Time Smoothing and Frequency Rebuild (TSFR), consists of performing a CSI phase sanitization method to remove phase impairments based on a linear regression transformation method, then a time domain filtering stage with a Savitzy-Golay (SG) filter for denoising purposes and, finally, the phase is rebuilt, eliminating distortions in frequency caused by SG filtering. The TSFR method has been tested on five datasets obtained from experimental measurements, using three different deep learning algorithms, and compared against five other types of CSI phase processing. The results show an accuracy improvement using TSFR in all the cases. Concretely, accuracy performance higher than 90\% in most of the studied scenarios has been achieved with the proposed solution. In few-shot learning strategies, TSFR outperforms the state-of-the-art performance from 35% to 85%.

Published
2023
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5. Visualization of Similarity Models for CBR Comprehension and Maintenance

Author

Jimenez-Diaz, Guillermo, Díaz-Agudo, Belén, Hartmanis, Juris, Founding Editor, van Leeuwen, Jan, Series Editor, Hutchison, David, Editorial Board Member, Kanade, Takeo, Editorial Board Member, Kittler, Josef, Editorial Board Member, Kleinberg, Jon M., Editorial Board Member, Kobsa, Alfred, Series Editor, Mattern, Friedemann, Editorial Board Member, Mitchell, John C., Editorial Board Member, Naor, Moni, Editorial Board Member, Nierstrasz, Oscar, Series Editor, Pandu Rangan, C., Editorial Board Member, Sudan, Madhu, Series Editor, Terzopoulos, Demetri, Editorial Board Member, Tygar, Doug, Editorial Board Member, Weikum, Gerhard, Series Editor, Vardi, Moshe Y, Series Editor, Goos, Gerhard, Founding Editor, Bertino, Elisa, Editorial Board Member, Gao, Wen, Editorial Board Member, Steffen, Bernhard, Editorial Board Member, Yung, Moti, Editorial Board Member, Woeginger, Gerhard, Editorial Board Member, Recio-Garcia, Juan A., editor, Orozco-del-Castillo, Mauricio G., editor, and Bridge, Derek, editor

Published
2024
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6. A Systematic Literature Review on Mercantilism

Author

Biju, Hannah, Jaheer Mukthar, K. P., Ramírez-Asís, Norma, Castillo-Picon, Jorge, Pelaez-Diaz, Guillermo, Silva-Gonzales, Liset, Kacprzyk, Janusz, Series Editor, Hamdan, Allam, editor, and Aldhaen, Esra Saleh, editor

Published
2024
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10. Gender Divergence on Entrepreneurial Proclivity – An Empirical Analysis of Polytechnic Diploma Holders

Author

Murugesan, T. K., Kumar, Madhu Druva, Jaheer Mukthar, K. P., Pelaez-Diaz, Guillermo, Pérez-Falcón, Julián, Castillo-Picon, Jorge, Kacprzyk, Janusz, Series Editor, Gomide, Fernando, Advisory Editor, Kaynak, Okyay, Advisory Editor, Liu, Derong, Advisory Editor, Pedrycz, Witold, Advisory Editor, Polycarpou, Marios M., Advisory Editor, Rudas, Imre J., Advisory Editor, Wang, Jun, Advisory Editor, Alareeni, Bahaaeddin, editor, Hamdan, Allam, editor, Khamis, Reem, editor, and Khoury, Rim El, editor

Published
2023
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12. User Evaluation to Measure the Perception of Similarity Measures in Artworks

Author

Díaz-Agudo, Belén, Jimenez-Diaz, Guillermo, Jorro-Aragoneses, Jose Luis, Goos, Gerhard, Founding Editor, Hartmanis, Juris, Founding Editor, Bertino, Elisa, Editorial Board Member, Gao, Wen, Editorial Board Member, Steffen, Bernhard, Editorial Board Member, Woeginger, Gerhard, Editorial Board Member, Yung, Moti, Editorial Board Member, Sánchez-Ruiz, Antonio A., editor, and Floyd, Michael W., editor

Published
2021
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19. El impacto del financiamiento público a la investigación y desarrollo en el desempeño de las empresas en México.

Author

Vergara Reyes, Delia Margarita, Guerrero, Alex J., Arenas Díaz, Guillermo, and Heijs, Joost

Subjects
PUBLIC finance, INNOVATIONS in business, ORGANIZATIONAL performance, RESEARCH & development, PUBLIC sector
Abstract

Copyright of Revista de la CEPAL is the property of United Nations Publications and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Published
2024

20. Impacto de las remesas en la reducción de la pobreza a nivel territorial en Guatemala.

Author

Díaz, Guillermo and Burg, Natalie

Subjects
PUBLIC investments, ECONOMETRIC models, REMITTANCES, CITIES & towns, POVERTY
Abstract

Copyright of Aposta is the property of Aposta and its content may not be copied or emailed to multiple sites or posted to a listserv without the copyright holder's express written permission. However, users may print, download, or email articles for individual use. This abstract may be abridged. No warranty is given about the accuracy of the copy. Users should refer to the original published version of the material for the full abstract. (Copyright applies to all Abstracts.)

Published
2024

21. Explanation of Recommenders Using Formal Concept Analysis

Author

Diaz-Agudo, Belen, Caro-Martinez, Marta, Recio-Garcia, Juan A., Jorro-Aragoneses, Jose, Jimenez-Diaz, Guillermo, Goos, Gerhard, Founding Editor, Hartmanis, Juris, Founding Editor, Bertino, Elisa, Editorial Board Member, Gao, Wen, Editorial Board Member, Steffen, Bernhard, Editorial Board Member, Woeginger, Gerhard, Editorial Board Member, Yung, Moti, Editorial Board Member, Bach, Kerstin, editor, and Marling, Cindy, editor

Published
2019
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22. An Algorithm Independent Case-Based Explanation Approach for Recommender Systems Using Interaction Graphs

Author

Caro-Martinez, Marta, Recio-Garcia, Juan A., Jimenez-Diaz, Guillermo, Goos, Gerhard, Founding Editor, Hartmanis, Juris, Founding Editor, Bertino, Elisa, Editorial Board Member, Gao, Wen, Editorial Board Member, Steffen, Bernhard, Editorial Board Member, Woeginger, Gerhard, Editorial Board Member, Yung, Moti, Editorial Board Member, Bach, Kerstin, editor, and Marling, Cindy, editor

Published
2019
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23. Personalized Case-Based Explanation of Matrix Factorization Recommendations

Author

Jorro-Aragoneses, Jose, Caro-Martinez, Marta, Recio-Garcia, Juan Antonio, Diaz-Agudo, Belen, Jimenez-Diaz, Guillermo, Goos, Gerhard, Founding Editor, Hartmanis, Juris, Founding Editor, Bertino, Elisa, Editorial Board Member, Gao, Wen, Editorial Board Member, Steffen, Bernhard, Editorial Board Member, Woeginger, Gerhard, Editorial Board Member, Yung, Moti, Editorial Board Member, Bach, Kerstin, editor, and Marling, Cindy, editor

Published
2019
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28. Case Base Elicitation for a Context-Aware Recommender System

Author

Jorro-Aragoneses, Jose Luis, Jimenez-Díaz, Guillermo, Recio-García, Juan Antonio, Díaz-Agudo, Belén, Hutchison, David, Series Editor, Kanade, Takeo, Series Editor, Kittler, Josef, Series Editor, Kleinberg, Jon M., Series Editor, Mattern, Friedemann, Series Editor, Mitchell, John C., Series Editor, Naor, Moni, Series Editor, Pandu Rangan, C., Series Editor, Steffen, Bernhard, Series Editor, Terzopoulos, Demetri, Series Editor, Tygar, Doug, Series Editor, Weikum, Gerhard, Series Editor, Cox, Michael T., editor, Funk, Peter, editor, and Begum, Shahina, editor

Published
2018
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29. The Andalusian Bipolar Family (ABiF) Study: Protocol and sample description

Author

Guzman-Parra, Jose, Rivas, Fabio, Strohmaier, Jana, Forstner, Andreas, Streit, Fabian, Auburger, Georg, Propping, Peter, Orozco-Diaz, Guillermo, González, Maria José, Gil-Flores, Susana, Cabaleiro-Fabeiro, Francisco Javier, del Río-Noriega, Francisco, Perez-Perez, Fermin, Haro-González, Jesus, de Diego-Otero, Yolanda, Romero-Sanchiz, Pablo, Moreno-Küstner, Berta, Cichon, Sven, Nöthen, Markus M., Rietschel, Marcella, and Mayoral, Fermin

Published
2018
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30. El estudio Andalusian Bipolar Family (ABiF): protocolo y descripción de la muestra

Author

Guzman-Parra, Jose, Rivas, Fabio, Strohmaier, Jana, Forstner, Andreas, Streit, Fabian, Auburger, Georg, Propping, Peter, Orozco-Diaz, Guillermo, González, Maria José, Gil-Flores, Susana, Cabaleiro-Fabeiro, Francisco Javier, del Río-Noriega, Francisco, Perez-Perez, Fermin, Haro-González, Jesus, de Diego-Otero, Yolanda, Romero-Sanchiz, Pablo, Moreno-Küstner, Berta, Cichon, Sven, Nöthen, Markus M., Rietschel, Marcella, and Mayoral, Fermin

Published
2018
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33. Swarm Intelligence Scheme for Pathfinding and Action Planning of Non-player Characters on a Last-Generation Video Game

Author

Díaz, Guillermo, Iglesias, Andrés, Kacprzyk, Janusz, Series editor, Pal, Nikhil R., Advisory editor, Bello Perez, Rafael, Advisory editor, Corchado, Emilio S., Advisory editor, Hagras, Hani, Advisory editor, Kóczy, László T., Advisory editor, Kreinovich, Vladik, Advisory editor, Lin, Chin-Teng, Advisory editor, Lu, Jie, Advisory editor, Melin, Patricia, Advisory editor, Nedjah, Nadia, Advisory editor, Nguyen, Ngoc Thanh, Advisory editor, Wang, Jun, Advisory editor, and Del Ser, Javier, editor

Published
2017
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34. Intelligent Behavioral Design of Non-player Characters in a FPS Video Game Through PSO

Author

Díaz, Guillermo, Iglesias, Andrés, Hutchison, David, Series editor, Kanade, Takeo, Series editor, Kittler, Josef, Series editor, Kleinberg, Jon M., Series editor, Mattern, Friedemann, Series editor, Mitchell, John C., Series editor, Naor, Moni, Series editor, Pandu Rangan, C., Series editor, Steffen, Bernhard, Series editor, Terzopoulos, Demetri, Series editor, Tygar, Doug, Series editor, Weikum, Gerhard, Series editor, Tan, Ying, editor, Takagi, Hideyuki, editor, and Shi, Yuhui, editor

Published
2017
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35. Similar Users or Similar Items? Comparing Similarity-Based Approaches for Recommender Systems in Online Judges

Author

Caro-Martinez, Marta, Jimenez-Diaz, Guillermo, Hutchison, David, Series editor, Kanade, Takeo, Series editor, Kittler, Josef, Series editor, Kleinberg, Jon M., Series editor, Mattern, Friedemann, Series editor, Mitchell, John C., Series editor, Naor, Moni, Series editor, Pandu Rangan, C., Series editor, Steffen, Bernhard, Series editor, Terzopoulos, Demetri, Series editor, Tygar, Doug, Series editor, Weikum, Gerhard, Series editor, Aha, David W., editor, and Lieber, Jean, editor

Published
2017
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36. Case-Based Recommendation for Online Judges Using Learning Itineraries

Author

Sánchez-Ruiz, Antonio A., Jimenez-Diaz, Guillermo, Gómez-Martín, Pedro P., Gómez-Martín, Marco A., Hutchison, David, Series editor, Kanade, Takeo, Series editor, Kittler, Josef, Series editor, Kleinberg, Jon M., Series editor, Mattern, Friedemann, Series editor, Mitchell, John C., Series editor, Naor, Moni, Series editor, Pandu Rangan, C., Series editor, Steffen, Bernhard, Series editor, Terzopoulos, Demetri, Series editor, Tygar, Doug, Series editor, Weikum, Gerhard, Series editor, Aha, David W., editor, and Lieber, Jean, editor

Published
2017
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37. Fluid accretion onto relativistic stars and gravitational radiation

Author

Nagar, Alessandro and Diaz, Guillermo

Subjects
General Relativity and Quantum Cosmology
Abstract

This article reports results from numerical simulations of the gravitational radiation emitted from nonrotating relativistic stars as a result of the axisymmetric accretion of layers of perfect fluid matter, shaped in the form of quadrupolar shells. We adopt a {\em hybrid} procedure where we evolve numerically the polar nonspherical perturbations equations of the star coupled to a fully nonlinear hydrodynamics code that calculates the motion of the accreting matter. Self-gravity of the accreting fluid as well as radiation reaction effects are neglected., Comment: 6 pages and 2 figures. To appear in the proceedings of the 27th Spanish Relativity Meeting - Gravitational Radiation - ERE 2003 -Alicante (Spain) -Sep. 11-13 (2003)

Published
2004

38. Accretion-driven gravitational radiation from nonrotating compact objects. Infalling quadrupolar shells

Author

Nagar, Alessandro, Diaz, Guillermo, Pons, Jose A., and Font, Jose A.

Subjects
General Relativity and Quantum Cosmology
Abstract

This paper reports results from numerical simulations of the gravitational radiation emitted from non--rotating compact objects(both neutron stars and Schwarzschild black holes) as a result of the accretion of matter. A hybrid procedure is adopted: we evolve, in axisymmetry, the linearized equations describing metric and fluid perturbations, coupled with a nonlinear hydrodynamics code that calculates the motion of the accreting matter. The initial matter distribution is shaped in the form of extended quadrupolar shells of dust or perfect fluid. Self--gravity and radiation reaction effects of the accreting fluid are neglected. This idealized setup is used to understand the qualitative features appearing in the energy spectrum of the gravitational wave emission from compact stars or black holes, subject to accretion processes involving extended objects. A comparison for the case of point--like particles falling radially onto black holes is also provided. Our results show that, when the central object is a black hole, the spectrum is far from having only one clear, monochromatic peak at the frequency of the fundamental quasi-normal mode, but it shows a complex pattern, with interference fringes produced by the interaction between the infalling matter and the underlying perturbed spacetime: most of the energy is emitted at frequencies lower than that of the fundamental mode of the black hole. Similar results are obtained for extended shells accreting onto neutron stars, but in this case the stellar fundamental mode is clearly excited. Our analysis shows that the gravitational wave signal driven by accretion is influenced more by the details and dynamics of the process, than by the quasi--normal mode structure of the central object., Comment: 23 pages, 12 figures, v3. Replaced fig.6. Small changes in the text to match the version published in Phys. Rev. D

Published
2004
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39. Similarity Metrics from Social Network Analysis for Content Recommender Systems

Author

Jimenez-Diaz, Guillermo, Gómez Martín, Pedro Pablo, Gómez Martín, Marco Antonio, Sánchez-Ruiz, Antonio A., Hutchison, David, Series editor, Kanade, Takeo, Series editor, Kittler, Josef, Series editor, Kleinberg, Jon M., Series editor, Mattern, Friedemann, Series editor, Mitchell, John C., Series editor, Naor, Moni, Series editor, Pandu Rangan, C., Series editor, Steffen, Bernhard, Series editor, Terzopoulos, Demetri, Series editor, Tygar, Doug, Series editor, Weikum, Gerhard, Series editor, Goel, Ashok, editor, Díaz-Agudo, M Belén, editor, and Roth-Berghofer, Thomas, editor

Published
2016
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40. Searching Museum Routes Using CBR

Author

Aguirre-Pemán, Jesús, Díaz-Agudo, Belén, Jimenez-Diaz, Guillermo, Hutchison, David, Series editor, Kanade, Takeo, Series editor, Kittler, Josef, Series editor, Kleinberg, Jon M., Series editor, Mattern, Friedemann, Series editor, Mitchell, John C., Series editor, Naor, Moni, Series editor, Pandu Rangan, C., Series editor, Steffen, Bernhard, Series editor, Terzopoulos, Demetri, Series editor, Tygar, Doug, Series editor, Weikum, Gerhard, Series editor, Goel, Ashok, editor, Díaz-Agudo, M Belén, editor, and Roth-Berghofer, Thomas, editor

Published
2016
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44. Computing Constructs by Using Typical Testor Algorithms

Author

Lazo-Cortés, Manuel S., Carrasco-Ochoa, Jesús Ariel, Martínez-Trinidad, José Fco., Sanchez-Diaz, Guillermo, Hutchison, David, Series editor, Kanade, Takeo, Series editor, Kittler, Josef, Series editor, Kleinberg, Jon M., Series editor, Mattern, Friedemann, Series editor, Mitchell, John C., Series editor, Naor, Moni, Series editor, Pandu Rangan, C., Series editor, Steffen, Bernhard, Series editor, Terzopoulos, Demetri, Series editor, Tygar, Doug, Series editor, Weikum, Gerhard, Series editor, Carrasco-Ochoa, Jesús Ariel, editor, Martí­nez-Trinidad, José Francisco, editor, Sossa-Azuela, Juan Humberto, editor, Olvera López, José Arturo, editor, and Famili, Fazel, editor

Published
2015
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48. A Semantically Enriched Context-Aware OER Recommendation Strategy and Its Application to a Computer Science OER Repository

Author

Ruiz-Iniesta, Almudena, Jiménez-Díaz, Guillermo, and Gómez-Albarrán, Mercedes

Abstract

This paper describes a knowledge-based strategy for recommending educational resources-worked problems, exercises, quiz questions, and lecture notes-to learners in the first two courses in the introductory sequence of a computer science major (CS1 and CS2). The goal of the recommendation strategy is to provide support for personalized access to the resources that exist in open educational repositories. The strategy uses: 1) a description of the resources based on metadata standards enriched by ontology-based semantic indexing, and 2) contextual information about the user (her knowledge of that particular field of learning). The results of an experimental analysis of the strategy's performance are presented. These demonstrate that the proposed strategy offers a high level of personalization and can be adapted to the user. An application of the strategy to a repository of computer science open educational resources was well received by both educators and students and had promising effects on the student performance and dropout rates.

Published
2014
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50. Are Reducts and Typical Testors the Same?

Author

Lazo-Cortés, Manuel S., Martínez-Trinidad, José Fco., Carrasco-Ochoa, Jesús Ariel, Sanchez-Diaz, Guillermo, Hutchison, David, Series editor, Kanade, Takeo, Series editor, Kittler, Josef, Series editor, Kleinberg, Jon M., Series editor, Kobsa, Alfred, Series editor, Mattern, Friedemann, Series editor, Mitchell, John C., Series editor, Naor, Moni, Series editor, Nierstrasz, Oscar, Series editor, Pandu Rangan, C., Series editor, Steffen, Bernhard, Series editor, Terzopoulos, Demetri, Series editor, Tygar, Doug, Series editor, Weikum, Gerhard, Series editor, Bayro-Corrochano, Eduardo, editor, and Hancock, Edwin, editor

Published
2014
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