Experimento para medida vibraciones

Grabaciones mediante cámara y micrófono de un altavoz emitiendo un sonido formado por 2 funciones sinusoidales de frecuencias 317 Hz y 412 Hz.

Vídeo experimento vibrometría de diapasón

Vídeo del experimento realizado para medir la frecuencia de vibración de un diapasón.

Phosphoramidite-Cu(OTf)2 complexes as chiral catalysts for 1,3-dipolar cycloaddition of iminoesters and nitroalkenes

Chiral complexes formed by phosphoramidites such as (Sa,R,R)-9 and Cu(OTf)2 are excellent catalysts for the general 1,3-dipolar cycloaddition between azomethine ylides and nitroalkenes affording the corresponding tetrasubstituted proline esters mainly as exo-cycloadducts in high er at room temperature. The exo-cycloadducts can be obtained in enantiomerically pure form just after simple recrystallization. DFT calculations support the stereochemical results.

Event-based visual servoing

Traditional visual servoing systems have been widely studied in the last years. These systems control the position of the camera attached to the robot end-effector guiding it from any position to the desired one. These controllers can be improved by using the event-based control paradigm. The system proposed in this paper is based on the idea of activating the visual controller only when something significant has occurred in the system (e.g. when any visual feature can be loosen because it is going outside the frame). Different event triggers have been defined in the image space in order to activate or deactivate the visual controller. The tests implemented to validate the proposal have proved that this new scheme avoids visual features to go out of the image whereas the system complexity is reduced considerably. Events can be used in the future to change different parameters of the visual servoing systems.

Guidance of robot arms using depth data from RGB-D camera

Image Based Visual Servoing (IBVS) is a robotic control scheme based on vision. This scheme uses only the visual information obtained from a camera to guide a robot from any robot pose to a desired one. However, IBVS requires the estimation of different parameters that cannot be obtained directly from the image. These parameters range from the intrinsic camera parameters (which can be obtained from a previous camera calibration), to the measured distance on the optical axis between the camera and visual features, it is the depth. This paper presents a comparative study of the performance of D-IBVS estimating the depth from three different ways using a low cost RGB-D sensor like Kinect. The visual servoing system has been developed over ROS (Robot Operating System), which is a meta-operating system for robots. The experiments prove that the computation of the depth value for each visual feature improves the system performance.

Improving subjectivity detection using unsupervised subjectivity word sense disambiguation

En este trabajo se presenta un método para la detección de subjetividad a nivel de oraciones basado en la desambiguación subjetiva del sentido de las palabras. Para ello se extiende un método de desambiguación semántica basado en agrupamiento de sentidos para determinar cuándo las palabras dentro de la oración están siendo utilizadas de forma subjetiva u objetiva. En nuestra propuesta se utilizan recursos semánticos anotados con valores de polaridad y emociones para determinar cuándo un sentido de una palabra puede ser considerado subjetivo u objetivo. Se presenta un estudio experimental sobre la detección de subjetividad en oraciones, en el cual se consideran las colecciones del corpus MPQA y Movie Review Dataset, así como los recursos semánticos SentiWordNet, Micro-WNOp y WordNet-Affect. Los resultados obtenidos muestran que nuestra propuesta contribuye de manera significativa en la detección de subjetividad.

Personatges il·lustres de Cocentaina en l'època andalusina (ss. VIII-XIII), segons les fonts àrabs

La realització d'aquest estudi s'insereix dins del marc del Projecte d'investigació PROMETEO/2009-042 DIGICOTRACAM.

Les deux chemins opposés de la cartographie arabo-islamique médiévale: la mappemonde «islamique» («L'école d’al-Balḫī», Xe siècle) ou le monde en sa diversité (al-Šarīf al Idrīsī, XIIe siècle)

Cette étude fait partie du Projet «Biblioteca Digital Multilingue del Mediterráneo-IVITRA», du programme PROMETEO de la Generalitat Valenciana para Grups de Recerca d’I+D d'Excel·lència, réf. PROMETEO-2009-042, que nous développons dans le projet IVITRA (http://ivitra.ua.es).

Ligand tethering by ion-exchange for the immobilization of homogeneous catalysts

A Rh phosphine complex, derived from the Wilkinson’s catalyst, has been immobilized by ion-exchange on the ammonium form of a Al-MCM-41 sample. Ammonium ions have been exchanged by cholamine ions, which act as an amine ligand, and then the Wilkinson’s catalyst has been immobilized by substitution of a phosphine ligand by the anchored amine. This is a novel immobilization procedure, as a ligand, instead of the whole complex, is tethered to the support by ion exchange. The obtained hybrid catalyst has been characterized by Elemental Analysis, DRIFTS and XPS. The quantitative exchange of ammonium by cholamine and coordination of Rh to amines has been observed. Most of the anchored Rh is considered to be coordinated to the ligand tethered to the support and a small proportion seems to be interacting with the protonated ligand or with the support surface. The catalyst has been tested in the hydrogenation of cyclohexene and in the hydroformylation of 1-octene. In the first case the catalyst is active and reusable, while a strong Rh leaching takes place in the second one.

Benimantell i la Vall de Guadalest en el període andalusí, segles VIII-XV

La realizació d’aquest treball s’inclou en el marc del Projecte DIGICOTRACAM, en el si del Programa Prometeu de la Generalitat Valenciana per a Grups de Recerca d’I+D d’Excel·lència, ref. PROMETEO-2009-042, tot això desenvolupat dintre del Projecte IVITRA (http://www.ivitra.ua.es ).

Extractive text summarization: can we use the same techniques for any text?

In this paper we address two issues. The first one analyzes whether the performance of a text summarization method depends on the topic of a document. The second one is concerned with how certain linguistic properties of a text may affect the performance of a number of automatic text summarization methods. For this we consider semantic analysis methods, such as textual entailment and anaphora resolution, and we study how they are related to proper noun, pronoun and noun ratios calculated over original documents that are grouped into related topics. Given the obtained results, we can conclude that although our first hypothesis is not supported, since it has been found no evident relationship between the topic of a document and the performance of the methods employed, adapting summarization systems to the linguistic properties of input documents benefits the process of summarization.

COMPENDIUM: A text summarization system for generating abstracts of research papers

This article analyzes the appropriateness of a text summarization system, COMPENDIUM, for generating abstracts of biomedical papers. Two approaches are suggested: an extractive (COMPENDIUM E), which only selects and extracts the most relevant sentences of the documents, and an abstractive-oriented one (COMPENDIUM E–A), thus facing also the challenge of abstractive summarization. This novel strategy combines extractive information, with some pieces of information of the article that have been previously compressed or fused. Specifically, in this article, we want to study: i) whether COMPENDIUM produces good summaries in the biomedical domain; ii) which summarization approach is more suitable; and iii) the opinion of real users towards automatic summaries. Therefore, two types of evaluation were performed: quantitative and qualitative, for evaluating both the information contained in the summaries, as well as the user satisfaction. Results show that extractive and abstractive-oriented summaries perform similarly as far as the information they contain, so both approaches are able to keep the relevant information of the source documents, but the latter is more appropriate from a human perspective, when a user satisfaction assessment is carried out. This also confirms the suitability of our suggested approach for generating summaries following an abstractive-oriented paradigm.

A multimodal genre recognition prototype

In this paper, a multimodal and interactive prototype to perform music genre classification is presented. The system is oriented to multi-part files in symbolic format but it can be adapted using a transcription system to transform audio content in music scores. This prototype uses different sources of information to give a possible answer to the user. It has been developed to allow a human expert to interact with the system to improve its results. In its current implementation, it offers a limited range of interaction and multimodality. Further development aimed at full interactivity and multimodal interactions is discussed.

Creación automática de sistemas de búsqueda de respuestas en dominios restringidos

Los sistemas de búsqueda de respuestas (BR) se pueden considerar como potenciales sucesores de los buscadores tradicionales de información en la Web. Para que sean precisos deben adaptarse a dominios concretos mediante el uso de recursos semánticos adecuados. La adaptación no es una tarea trivial, ya que deben integrarse e incorporarse a sistemas de BR existentes varios recursos heterogéneos relacionados con un dominio restringido. Se presenta la herramienta Maraqa, cuya novedad radica en el uso de técnicas de ingeniería del software, como el desarrollo dirigido por modelos, para automatizar dicho proceso de adaptación a dominios restringidos. Se ha evaluado Maraqa mediante una serie de experimentos (sobre el dominio agrícola) que demuestran su viabilidad, mejorando en un 29,5% la precisión del sistema adaptado.

Las ciencias de la nutrición en la España de la segunda mitad del siglo XX; estudio bibliométrico descriptivo de la revista Anales de Bromatología (1949-1993)

Objetivo: Analizar la institucionalización de las ciencias de la nutrición en la España de la segunda mitad del siglo XX, y evaluar la actividad desarrollada por la revista Anales de Bromatología. Método: Estudio bibliométrico descriptivo de los artículos originales. Se recogió el nombre y apellidos de los autores y el título completo. A partir de las palabras clave, por consenso entre los autores del estudio, se asignó a cada artículo una sola materia principal de acuerdo con la agrupación de las trece temáticas que seguía la Sociedad Española de Bromatología en sus reuniones. Se ha analizado la distribución y tendencia de los indicadores generales de producción y sus características. Resultados: Se publicaron un total de 917 artículos originales con una media de 20,8 trabajos/año. Las materias que registraron mayor porcentaje de artículos fueron: sustancias extrañas a los alimentos, alimentos de origen vegetal y nutrición. Participaron un total de 874 autores, con un índice de colaboración de 2,43 y de transitoriedad del 70,1%. La distribución del número de firmantes por artículo se acerca bastante a lo que indica la ley de productividad de Lotka. Doce máximos productores, con presencia mayoritaria de mujeres, participaron en el 49,9% de los artículos publicados. Conclusión: La Revista mostró una baja productividad y un carácter endogámico, con un protagonismo destacado de los autores relacionados con la Escuela de Bromatología de la Facultad de Farmacia de la Universidad Complutense. Las temáticas abordadas respondían a los retos de la transición alimentaria y nutricional de la población española.