Vidal Alonso | Universidad Pontificia de Salamanca (original) (raw)

Papers by Vidal Alonso

Research paper thumbnail of Documentación cursos de adiestramiento

Research paper thumbnail of A distributed architecture for facilitating the integration of blind musicians in symphonic orchestras

Expert Systems With Applications, Dec 1, 2010

The emergence of new technologies is providing opportunities to develop novel solutions that faci... more The emergence of new technologies is providing opportunities to develop novel solutions that facilitate the integration of visually impaired people in different activities of our daily life. This paper presents a distributed intelligent architecture, called DIAMI, focused on facilitating the integration of blind musicians into orchestras. The DIAMI architecture provides a distributed, ubiquitous system aimed at providing a way for blind musicians to receive instructions from the orchestra conductor in an unobtrusive manner. The structure of the DIAMI architecture and the preliminary results obtained are presented in detail within this paper.

Research paper thumbnail of A Clustering Algorithm Based on an Ensemble of Dissimilarities: An Application in the Bioinformatics Domain

International Journal of Interactive Multimedia and Artificial Intelligence, 2022

Clustering algorithms such as k-means depend heavily on choosing an appropriate distance metric t... more Clustering algorithms such as k-means depend heavily on choosing an appropriate distance metric that reflect accurately the object proximities. A wide range of dissimilarities may be defined that often lead to different clustering results. Choosing the best dissimilarity is an ill-posed problem and learning a general distance from the data is a complex task, particularly for high dimensional problems. Therefore, an appealing approach is to learn an ensemble of dissimilarities. In this paper, we have developed a semi-supervised clustering algorithm that learns a linear combination of dissimilarities considering incomplete knowledge in the form of pairwise constraints. The minimization of the loss function is based on a robust and efficient quadratic optimization algorithm. Besides, a regularization term is considered that controls the complexity of the distance metric learned avoiding overfitting. The algorithm has been applied to the identification of tumor samples using the gene expression profiles, where domain experts provide often incomplete knowledge in the form of pairwise constraints. We report that the algorithm proposed outperforms a standard semi-supervised clustering technique available in the literature and clustering results based on a single dissimilarity. The improvement is particularly relevant for applications with high level of noise.

Research paper thumbnail of Multi-Agent System for Detecting Elderly People Falls through Mobile Devices

Springer eBooks, 2011

Falls in the elderly and disabled people represent a major health problem in terms of primary car... more Falls in the elderly and disabled people represent a major health problem in terms of primary care costs facing the public and private systems. This paper presents a multi-agent system capable of detecting falls through sensors in a mobile device and act accordingly at runtime. The new system incorporates a fall detection algorithm based on machine learning and data classification using decision trees. The base of the system are three types of interrelated agents that coordinate to know the position of a user from data obtained through a mobile terminal, and GPS position, which in case of fall may be sent via SMS or by an automatic call. The proposed system is self-adaptive, since as new fall date is incorporated, the decision mechanisms are automatically updated and personalized taking into account the user profile.

Research paper thumbnail of El fondo social Europeo. Estructura y perspectivas: una revisión de la iniciativa EQUAL

Revesco Revista De Estudios Cooperativos, 2001

Research paper thumbnail of IV International Workshop on Practical Applications of Agents and Multiagent Systems, IWPAAMS 2007

IEEE Latin America Transactions, Oct 1, 2008

The present edition of IEEE Latin America Transactions includes a selection of the better works p... more The present edition of IEEE Latin America Transactions includes a selection of the better works presented at the sixth edition of the international workshop on practical applications of agents and multiagent systems, IWPAAMS 2007, held in Salamanca (Spain) the 12-13, November, 2007. Ten articles have been selected among the 61 articles presented to the workshop, those that received the better reviews from the Scientific Committee, and represent a good example of the research in this area in the Iberoamerican community.

Research paper thumbnail of A Clustering Algorithm Based on an Ensemble of Dissimilarities: An Application in the Bioinformatics Domain

International Journal of Interactive Multimedia and Artificial Intelligence

Clustering algorithms such as k-means depend heavily on choosing an appropriate distance metric t... more Clustering algorithms such as k-means depend heavily on choosing an appropriate distance metric that reflect accurately the object proximities. A wide range of dissimilarities may be defined that often lead to different clustering results. Choosing the best dissimilarity is an ill-posed problem and learning a general distance from the data is a complex task, particularly for high dimensional problems. Therefore, an appealing approach is to learn an ensemble of dissimilarities. In this paper, we have developed a semi-supervised clustering algorithm that learns a linear combination of dissimilarities considering incomplete knowledge in the form of pairwise constraints. The minimization of the loss function is based on a robust and efficient quadratic optimization algorithm. Besides, a regularization term is considered that controls the complexity of the distance metric learned avoiding overfitting. The algorithm has been applied to the identification of tumor samples using the gene expression profiles, where domain experts provide often incomplete knowledge in the form of pairwise constraints. We report that the algorithm proposed outperforms a standard semi-supervised clustering technique available in the literature and clustering results based on a single dissimilarity. The improvement is particularly relevant for applications with high level of noise.

Research paper thumbnail of IEEE Latin America Transactions

Research paper thumbnail of Comparativa de 4 lenguajes genéricos de definición de interfaces de usuario

ABSTRACT Resumen Los lenguajes genéricos para la definición de interfaces de usuario ofrecen meca... more ABSTRACT Resumen Los lenguajes genéricos para la definición de interfaces de usuario ofrecen mecanismos para especificar interfaces independientes del lenguaje de programación y dispositivo utilizado. De entre los distintos lenguajes propuestos, se han analizado algunos aspectos de 4 lenguajes basados en XML: UIML, XAML, XUL y XIML.

Research paper thumbnail of A New Adaptive Algorithm for Detecting Falls through Mobile Devices

Advances in Intelligent and Soft Computing, 2011

Most of elderly people suffer physical degeneration that makes them particularly vulnerable to fa... more Most of elderly people suffer physical degeneration that makes them particularly vulnerable to falls. Falls cause injuries, time of hospitalization, rehabilitation which is particularly difficult for the elderly and disabled. This paper presents a new system with advanced capacities for learning and adaptation specifically designed to detect falls through mobile devices. The systems proposes a new adaptive algorithm able to learn, classify and identify falls from data obtained by mobile devices and user profile. The system is based on machine learning and data classification using decision trees. The main contribution of the proposed system is the use of posturographic data and medical patterns as a knowledge base, which notably improves the classification process.

Research paper thumbnail of Presentation Adaptation: Results from a Case Study

Engineering the User Interface, 2008

... Ph.D. thesis, Universidad de Valladolid 16. Pedrero, A., Alonso, V., Villarroel, M., de la Fu... more ... Ph.D. thesis, Universidad de Valladolid 16. Pedrero, A., Alonso, V., Villarroel, M., de la Fuente, P (2005)..: Two different tools for user interface personalization. In: Iadis International Conference WWW/Internet 2005, Lisbon, pp. 76-80 17. ... AACE, Washington, pp 351-358 18. ...

Research paper thumbnail of A distributed architecture for facilitating the integration of blind musicians in symphonic orchestras

Expert Systems with Applications, 2010

The emergence of new technologies is providing opportunities to develop novel solutions that faci... more The emergence of new technologies is providing opportunities to develop novel solutions that facilitate the integration of visually impaired people in different activities of our daily life. This paper presents a distributed intelligent architecture, called DIAMI, focused on facilitating the integration of blind musicians into orchestras. The DIAMI architecture provides a distributed, ubiquitous system aimed at providing a way for blind musicians to receive instructions from the orchestra conductor in an unobtrusive manner. The structure of the DIAMI architecture and the preliminary results obtained are presented in detail within this paper.

Research paper thumbnail of SIDCA: Sistema multiagente de detección de caídas vía móvil en ancianos y personas de movilidad reducida

Nowadays, fall detection for elderly people and people with mobility disabilities is a major conc... more Nowadays, fall detection for elderly people and people with mobility disabilities is a major concern for public and private institutions. This paper presents a multiagent system aimed at detecting falls through mobile devices, and provide a response in execution time. The system incorporates a novel fall detection algorithm based on machine learning and decision trees techniques. The core of the proposed system are three agent types which coordinate themselves to obtain the posture of the user taken into consideration from the data that the mobile device provides, as well as the GPS position, which can be sent via SMS or automatic phone call to the relatives or care givers. The proposed system is self-adaptive and personalizes the decision frontiers established for the user.

Research paper thumbnail of Estructura de datos : implementación clásica y orientada a objetos / V. Alonso Secades, R. Berjón Gallinas, M. Raboso Mateos

Contenido: Estructuras fundamentales de datos; Listas enlazadas; Pilas; Colas; Recursividad; Arbo... more Contenido: Estructuras fundamentales de datos; Listas enlazadas; Pilas; Colas; Recursividad; Arboles; Grafos dirigidos; Ficheros; Algoritmos de ordenación interna; Hashing. Asignador; Iteradores; Algoritmos, funciones, predicados; Vector; Insertores; Dequeue; Lista; Arbol binario; Pilas, colas, bicolas y conjunto.

Research paper thumbnail of Elaboración de materiales didácticos (texto-guía, cuaderno y recursos de apoyo) para la docencia práctica de Psicología de la Memoria

El proyecto realizado en la Universidad Pontificia de Salamanca continúa la linea de los realizad... more El proyecto realizado en la Universidad Pontificia de Salamanca continúa la linea de los realizados en el área de procesos psicológicos básicos. En este proyecto han colaborado además del equipo base, profesores especialistas en la materia de diez universidades españolas y argentinas. El objetivo principal es el desarrollo de una serie de materiales didácticos para la docencia práctica de psicología de la memoria, por la ausencia de herramientas publicadas para llevar a cabo la misma. El sistema de trabajo ha consistido en: elaboración del esquema de contenidos, contacto con los especialistas, elaboración de bocetos y aplicación durante el curso 1998-1999 para evaluar el grado de idoneidad de los mismos. Los resultados del proceso seguido y los que se espera obtener en el futuro inciden en potenciar la eficacia de las prácticas, del sistema de tutorías, además de fomentar el trabajo grupal. Los materiales elaborados (texto guía y cuadernos) se han unificado por su utilidad práctica ...

Research paper thumbnail of Recommending Elements to Be Added to the User Interface

Research paper thumbnail of Adaptación de la presentación: resultados de un caso práctico

Research paper thumbnail of Two different tools for user interface personalization

Research paper thumbnail of Elaboración de materiales didácticos (texto-guía, cuaderno y recursos de apoyo) para la docencia práctica de Psicología de la Memoria

El proyecto realizado en la Universidad Pontificia de Salamanca continúa la linea de los realizad... more El proyecto realizado en la Universidad Pontificia de Salamanca continúa la linea de los realizados en el área de procesos psicológicos básicos. En este proyecto han colaborado además del equipo base, profesores especialistas en la materia de diez universidades españolas y argentinas. El objetivo principal es el desarrollo de una serie de materiales didácticos para la docencia práctica de psicología de la memoria, por la ausencia de herramientas publicadas para llevar a cabo la misma. El sistema de trabajo ha consistido en: elaboración del esquema de contenidos, contacto con los especialistas, elaboración de bocetos y aplicación durante el curso 1998-1999 para evaluar el grado de idoneidad de los mismos. Los resultados del proceso seguido y los que se espera obtener en el futuro inciden en potenciar la eficacia de las prácticas, del sistema de tutorías, además de fomentar el trabajo grupal. Los materiales elaborados (texto guía y cuadernos) se han unificado por su utilidad práctica ...

Research paper thumbnail of IWPAAMS2007-00 IV International Workshop.pdf

— The present edition of IEEE Latin America Transactions includes a selection of the better works... more — The present edition of IEEE Latin America Transactions includes a selection of the better works presented at the sixth edition of the international workshop on practical applications of agents and multiagent systems, IWPAAMS 2007, held in Salamanca (Spain) the 12-13, November, 2007. Ten articles have been selected among the 61 articles presented to the workshop, those that received the better reviews from the Scientific Committee, and represent a good example of the research in this area in the Iberoamerican community.

Research paper thumbnail of Documentación cursos de adiestramiento

Research paper thumbnail of A distributed architecture for facilitating the integration of blind musicians in symphonic orchestras

Expert Systems With Applications, Dec 1, 2010

The emergence of new technologies is providing opportunities to develop novel solutions that faci... more The emergence of new technologies is providing opportunities to develop novel solutions that facilitate the integration of visually impaired people in different activities of our daily life. This paper presents a distributed intelligent architecture, called DIAMI, focused on facilitating the integration of blind musicians into orchestras. The DIAMI architecture provides a distributed, ubiquitous system aimed at providing a way for blind musicians to receive instructions from the orchestra conductor in an unobtrusive manner. The structure of the DIAMI architecture and the preliminary results obtained are presented in detail within this paper.

Research paper thumbnail of A Clustering Algorithm Based on an Ensemble of Dissimilarities: An Application in the Bioinformatics Domain

International Journal of Interactive Multimedia and Artificial Intelligence, 2022

Clustering algorithms such as k-means depend heavily on choosing an appropriate distance metric t... more Clustering algorithms such as k-means depend heavily on choosing an appropriate distance metric that reflect accurately the object proximities. A wide range of dissimilarities may be defined that often lead to different clustering results. Choosing the best dissimilarity is an ill-posed problem and learning a general distance from the data is a complex task, particularly for high dimensional problems. Therefore, an appealing approach is to learn an ensemble of dissimilarities. In this paper, we have developed a semi-supervised clustering algorithm that learns a linear combination of dissimilarities considering incomplete knowledge in the form of pairwise constraints. The minimization of the loss function is based on a robust and efficient quadratic optimization algorithm. Besides, a regularization term is considered that controls the complexity of the distance metric learned avoiding overfitting. The algorithm has been applied to the identification of tumor samples using the gene expression profiles, where domain experts provide often incomplete knowledge in the form of pairwise constraints. We report that the algorithm proposed outperforms a standard semi-supervised clustering technique available in the literature and clustering results based on a single dissimilarity. The improvement is particularly relevant for applications with high level of noise.

Research paper thumbnail of Multi-Agent System for Detecting Elderly People Falls through Mobile Devices

Springer eBooks, 2011

Falls in the elderly and disabled people represent a major health problem in terms of primary car... more Falls in the elderly and disabled people represent a major health problem in terms of primary care costs facing the public and private systems. This paper presents a multi-agent system capable of detecting falls through sensors in a mobile device and act accordingly at runtime. The new system incorporates a fall detection algorithm based on machine learning and data classification using decision trees. The base of the system are three types of interrelated agents that coordinate to know the position of a user from data obtained through a mobile terminal, and GPS position, which in case of fall may be sent via SMS or by an automatic call. The proposed system is self-adaptive, since as new fall date is incorporated, the decision mechanisms are automatically updated and personalized taking into account the user profile.

Research paper thumbnail of El fondo social Europeo. Estructura y perspectivas: una revisión de la iniciativa EQUAL

Revesco Revista De Estudios Cooperativos, 2001

Research paper thumbnail of IV International Workshop on Practical Applications of Agents and Multiagent Systems, IWPAAMS 2007

IEEE Latin America Transactions, Oct 1, 2008

The present edition of IEEE Latin America Transactions includes a selection of the better works p... more The present edition of IEEE Latin America Transactions includes a selection of the better works presented at the sixth edition of the international workshop on practical applications of agents and multiagent systems, IWPAAMS 2007, held in Salamanca (Spain) the 12-13, November, 2007. Ten articles have been selected among the 61 articles presented to the workshop, those that received the better reviews from the Scientific Committee, and represent a good example of the research in this area in the Iberoamerican community.

Research paper thumbnail of A Clustering Algorithm Based on an Ensemble of Dissimilarities: An Application in the Bioinformatics Domain

International Journal of Interactive Multimedia and Artificial Intelligence

Clustering algorithms such as k-means depend heavily on choosing an appropriate distance metric t... more Clustering algorithms such as k-means depend heavily on choosing an appropriate distance metric that reflect accurately the object proximities. A wide range of dissimilarities may be defined that often lead to different clustering results. Choosing the best dissimilarity is an ill-posed problem and learning a general distance from the data is a complex task, particularly for high dimensional problems. Therefore, an appealing approach is to learn an ensemble of dissimilarities. In this paper, we have developed a semi-supervised clustering algorithm that learns a linear combination of dissimilarities considering incomplete knowledge in the form of pairwise constraints. The minimization of the loss function is based on a robust and efficient quadratic optimization algorithm. Besides, a regularization term is considered that controls the complexity of the distance metric learned avoiding overfitting. The algorithm has been applied to the identification of tumor samples using the gene expression profiles, where domain experts provide often incomplete knowledge in the form of pairwise constraints. We report that the algorithm proposed outperforms a standard semi-supervised clustering technique available in the literature and clustering results based on a single dissimilarity. The improvement is particularly relevant for applications with high level of noise.

Research paper thumbnail of IEEE Latin America Transactions

Research paper thumbnail of Comparativa de 4 lenguajes genéricos de definición de interfaces de usuario

ABSTRACT Resumen Los lenguajes genéricos para la definición de interfaces de usuario ofrecen meca... more ABSTRACT Resumen Los lenguajes genéricos para la definición de interfaces de usuario ofrecen mecanismos para especificar interfaces independientes del lenguaje de programación y dispositivo utilizado. De entre los distintos lenguajes propuestos, se han analizado algunos aspectos de 4 lenguajes basados en XML: UIML, XAML, XUL y XIML.

Research paper thumbnail of A New Adaptive Algorithm for Detecting Falls through Mobile Devices

Advances in Intelligent and Soft Computing, 2011

Most of elderly people suffer physical degeneration that makes them particularly vulnerable to fa... more Most of elderly people suffer physical degeneration that makes them particularly vulnerable to falls. Falls cause injuries, time of hospitalization, rehabilitation which is particularly difficult for the elderly and disabled. This paper presents a new system with advanced capacities for learning and adaptation specifically designed to detect falls through mobile devices. The systems proposes a new adaptive algorithm able to learn, classify and identify falls from data obtained by mobile devices and user profile. The system is based on machine learning and data classification using decision trees. The main contribution of the proposed system is the use of posturographic data and medical patterns as a knowledge base, which notably improves the classification process.

Research paper thumbnail of Presentation Adaptation: Results from a Case Study

Engineering the User Interface, 2008

... Ph.D. thesis, Universidad de Valladolid 16. Pedrero, A., Alonso, V., Villarroel, M., de la Fu... more ... Ph.D. thesis, Universidad de Valladolid 16. Pedrero, A., Alonso, V., Villarroel, M., de la Fuente, P (2005)..: Two different tools for user interface personalization. In: Iadis International Conference WWW/Internet 2005, Lisbon, pp. 76-80 17. ... AACE, Washington, pp 351-358 18. ...

Research paper thumbnail of A distributed architecture for facilitating the integration of blind musicians in symphonic orchestras

Expert Systems with Applications, 2010

The emergence of new technologies is providing opportunities to develop novel solutions that faci... more The emergence of new technologies is providing opportunities to develop novel solutions that facilitate the integration of visually impaired people in different activities of our daily life. This paper presents a distributed intelligent architecture, called DIAMI, focused on facilitating the integration of blind musicians into orchestras. The DIAMI architecture provides a distributed, ubiquitous system aimed at providing a way for blind musicians to receive instructions from the orchestra conductor in an unobtrusive manner. The structure of the DIAMI architecture and the preliminary results obtained are presented in detail within this paper.

Research paper thumbnail of SIDCA: Sistema multiagente de detección de caídas vía móvil en ancianos y personas de movilidad reducida

Nowadays, fall detection for elderly people and people with mobility disabilities is a major conc... more Nowadays, fall detection for elderly people and people with mobility disabilities is a major concern for public and private institutions. This paper presents a multiagent system aimed at detecting falls through mobile devices, and provide a response in execution time. The system incorporates a novel fall detection algorithm based on machine learning and decision trees techniques. The core of the proposed system are three agent types which coordinate themselves to obtain the posture of the user taken into consideration from the data that the mobile device provides, as well as the GPS position, which can be sent via SMS or automatic phone call to the relatives or care givers. The proposed system is self-adaptive and personalizes the decision frontiers established for the user.

Research paper thumbnail of Estructura de datos : implementación clásica y orientada a objetos / V. Alonso Secades, R. Berjón Gallinas, M. Raboso Mateos

Contenido: Estructuras fundamentales de datos; Listas enlazadas; Pilas; Colas; Recursividad; Arbo... more Contenido: Estructuras fundamentales de datos; Listas enlazadas; Pilas; Colas; Recursividad; Arboles; Grafos dirigidos; Ficheros; Algoritmos de ordenación interna; Hashing. Asignador; Iteradores; Algoritmos, funciones, predicados; Vector; Insertores; Dequeue; Lista; Arbol binario; Pilas, colas, bicolas y conjunto.

Research paper thumbnail of Elaboración de materiales didácticos (texto-guía, cuaderno y recursos de apoyo) para la docencia práctica de Psicología de la Memoria

El proyecto realizado en la Universidad Pontificia de Salamanca continúa la linea de los realizad... more El proyecto realizado en la Universidad Pontificia de Salamanca continúa la linea de los realizados en el área de procesos psicológicos básicos. En este proyecto han colaborado además del equipo base, profesores especialistas en la materia de diez universidades españolas y argentinas. El objetivo principal es el desarrollo de una serie de materiales didácticos para la docencia práctica de psicología de la memoria, por la ausencia de herramientas publicadas para llevar a cabo la misma. El sistema de trabajo ha consistido en: elaboración del esquema de contenidos, contacto con los especialistas, elaboración de bocetos y aplicación durante el curso 1998-1999 para evaluar el grado de idoneidad de los mismos. Los resultados del proceso seguido y los que se espera obtener en el futuro inciden en potenciar la eficacia de las prácticas, del sistema de tutorías, además de fomentar el trabajo grupal. Los materiales elaborados (texto guía y cuadernos) se han unificado por su utilidad práctica ...

Research paper thumbnail of Recommending Elements to Be Added to the User Interface

Research paper thumbnail of Adaptación de la presentación: resultados de un caso práctico

Research paper thumbnail of Two different tools for user interface personalization

Research paper thumbnail of Elaboración de materiales didácticos (texto-guía, cuaderno y recursos de apoyo) para la docencia práctica de Psicología de la Memoria

El proyecto realizado en la Universidad Pontificia de Salamanca continúa la linea de los realizad... more El proyecto realizado en la Universidad Pontificia de Salamanca continúa la linea de los realizados en el área de procesos psicológicos básicos. En este proyecto han colaborado además del equipo base, profesores especialistas en la materia de diez universidades españolas y argentinas. El objetivo principal es el desarrollo de una serie de materiales didácticos para la docencia práctica de psicología de la memoria, por la ausencia de herramientas publicadas para llevar a cabo la misma. El sistema de trabajo ha consistido en: elaboración del esquema de contenidos, contacto con los especialistas, elaboración de bocetos y aplicación durante el curso 1998-1999 para evaluar el grado de idoneidad de los mismos. Los resultados del proceso seguido y los que se espera obtener en el futuro inciden en potenciar la eficacia de las prácticas, del sistema de tutorías, además de fomentar el trabajo grupal. Los materiales elaborados (texto guía y cuadernos) se han unificado por su utilidad práctica ...

Research paper thumbnail of IWPAAMS2007-00 IV International Workshop.pdf

— The present edition of IEEE Latin America Transactions includes a selection of the better works... more — The present edition of IEEE Latin America Transactions includes a selection of the better works presented at the sixth edition of the international workshop on practical applications of agents and multiagent systems, IWPAAMS 2007, held in Salamanca (Spain) the 12-13, November, 2007. Ten articles have been selected among the 61 articles presented to the workshop, those that received the better reviews from the Scientific Committee, and represent a good example of the research in this area in the Iberoamerican community.

Research paper thumbnail of VI International Workshop on Practical Applications of Agents and Multiagent Systems, IWPAAMS 2007.pdf

The present edition of IEEE Latin America Transactions includes a selection of the better works p... more The present edition of IEEE Latin America Transactions includes a selection of the better works presented at the sixth edition of the international workshop on practical applications of agents and multiagent systems, IWPAAMS 2007, held in Salamanca (Spain) the 12-13, November, 2007. Ten articles have been selected among the 61 articles presented to the workshop, those that received the better reviews from the Scientific Committee, and represent a good example of the research in this area in the Iberoamerican community.