Panoràmica dels sistemes de gestió de biblioteques al segle XXI

In the past decade, a number of trends have come together in the general sphere of computing that have profoundly affected libraries. The popularisation of the Internet, the appearance of open and interoperable systems, the improvements within graphics and multimedia, and the generalised installation of LANs are some of the events of the period. Taken together, the result has been that libraries have undergone an important functional change, representing the switch from simple information depositories to information disseminators. Integrated library management systems have not remained unaffected by this transformation and those that have not adapted to the new technological surroundings are now referred to as legacy systems. The article describes the characteristics of systems existing in today's market and outlines future trends that, according to various authors, include the disappearance of the integrated library management systems that have traditionally been sold.

Nanosized Nb-TiO2 gas sensors derived from alkoxides hydrolization

Nanocrystalline TiO2 modified with Nb has been produced through the sol-gel technique. Nanopowders have been obtained by means of the hydrolysis of pure alkoxides with deionized water and peptization of the resulting hydrolysate with diluted acid nitric at 100 C. The addition of Nb stabilizes the anatase phase to higher temperatures. XRD spectra of the undoped and the Nb-doped samples show that the undoped sample has been almost totally converted to rutile at 600 C, meanwhile the doped samples present still a low percentage of rutile phase. Nanocrystalline powders stabilized at 600 C with grain sizes of about 17 nm have successfully been synthesized by the addition of Nb with a concentration of 2% at., which appears to be an adequate additive concentration to improve the gas sensor performances, such as it is suggested by the catalytic conversion efficiency experiments performed from FTIR measurements. FTIR absorbance spectra show that catalytic conversion of CO occurs at lower temperatures when niobium is introduced. The electrical response of the films to different concentrations of CO and ethanol has been monitored in dry and wet environments in order to test the influence of humidity in the sensor response. The addition of Nb decreases the working temperature and increases the stability of the layers. Also, large enhancement of the response time is obtained even with lower working temperatures. Moreover, humidity effects on the gas sensor response toward CO and ethanol are less important in Nb-doped samples than in the undoped ones.

Nanosized Nb-TiO2 gas sensors derived from alkoxides hydrolization

Nanocrystalline TiO2 modified with Nb has been produced through the sol-gel technique. Nanopowders have been obtained by means of the hydrolysis of pure alkoxides with deionized water and peptization of the resulting hydrolysate with diluted acid nitric at 100 C. The addition of Nb stabilizes the anatase phase to higher temperatures. XRD spectra of the undoped and the Nb-doped samples show that the undoped sample has been almost totally converted to rutile at 600 C, meanwhile the doped samples present still a low percentage of rutile phase. Nanocrystalline powders stabilized at 600 C with grain sizes of about 17 nm have successfully been synthesized by the addition of Nb with a concentration of 2% at., which appears to be an adequate additive concentration to improve the gas sensor performances, such as it is suggested by the catalytic conversion efficiency experiments performed from FTIR measurements. FTIR absorbance spectra show that catalytic conversion of CO occurs at lower temperatures when niobium is introduced. The electrical response of the films to different concentrations of CO and ethanol has been monitored in dry and wet environments in order to test the influence of humidity in the sensor response. The addition of Nb decreases the working temperature and increases the stability of the layers. Also, large enhancement of the response time is obtained even with lower working temperatures. Moreover, humidity effects on the gas sensor response toward CO and ethanol are less important in Nb-doped samples than in the undoped ones.

Design of surface forces apparatus for tribology studies combined with nonlinear optical spectroscopy

We describe the design, calibration, and performance of surface forces apparatus with the capability of illumination of the contact interface for spectroscopic investigation using optical techniques. The apparatus can be placed in the path of a Nd-YAG laser for studies of the linear response or the second harmonic and sum-frequency generation from a material confined between the two surfaces. In addition to the standard fringes of equal chromatic order technique, which we have digitized for accurate and fast analysis, the distance of separation can be measured with a fiber-optic interferometer during spectroscopic measurements (2 Å resolution and 10 ms response time). The sample approach is accomplished through application of a motor drive, piezoelectric actuator, or electromagnetic lever deflection for variable degrees of range, sensitivity, and response time. To demonstrate the operation of the instrument, the stepwise expulsion of discrete layers of octamethylcyclotetrasiloxane from the contact is shown. Lateral forces may also be studied by using piezoelectric bimorphs to induce and direct the motion of one surface.

Automatic Prediction of Facial Trait Judgments: Appearance vs. Structural Models

Evaluating other individuals with respect to personality characteristics plays a crucial role in human relations and it is the focus of attention for research in diverse fields such as psychology and interactive computer systems. In psychology, face perception has been recognized as a key component of this evaluation system. Multiple studies suggest that observers use face information to infer personality characteristics. Interactive computer systems are trying to take advantage of these findings and apply them to increase the natural aspect of interaction and to improve the performance of interactive computer systems. Here, we experimentally test whether the automatic prediction of facial trait judgments (e.g. dominance) can be made by using the full appearance information of the face and whether a reduced representation of its structure is sufficient. We evaluate two separate approaches: a holistic representation model using the facial appearance information and a structural model constructed from the relations among facial salient points. State of the art machine learning methods are applied to a) derive a facial trait judgment model from training data and b) predict a facial trait value for any face. Furthermore, we address the issue of whether there are specific structural relations among facial points that predict perception of facial traits. Experimental results over a set of labeled data (9 different trait evaluations) and classification rules (4 rules) suggest that a) prediction of perception of facial traits is learnable by both holistic and structural approaches; b) the most reliable prediction of facial trait judgments is obtained by certain type of holistic descriptions of the face appearance; and c) for some traits such as attractiveness and extroversion, there are relationships between specific structural features and social perceptions.

Factores involucrados en el proceso de toma de decisiones en bibliotecas de tamaño medio y pequeño. Resultados del proyecto DECIMAL.

Se presentan los resultados de la investigación realizada en el marco del proyecto europeo DECIMAL, que tiene como objetivo el desarrollo de un módulo integrado de soporte de la toma de decisiones para sistemas automatizados usados en bibliotecas pequeñas y medianas. La investigación cuantitativa y cualitativa llevada a cabo en el Reino Unido, Italia y España se ha basado en una combinación de diversos métodos: revisión de la literatura, entrevistas semiestructuradas, cuestionarios y grupos de discusión en ocasión de los dos seminarios de presentación realizados. Se distinguen dos líneas básicas de investigación: la primera en torno a la utilización real de indicadores y medidas para la gestión y evaluación de la actividad del centro, así como su interés potencial en el caso que no se hayan aplicado por el momento, y la segunda en torno al tipo de decisiones más habituales en los centros y los factores que inciden en este proceso (fuentes de información utilizadas, cultura institucional, formación, nivel de satisfacción). El artículo está centrado en los resultados obtenidos en las bibliotecas españolas, aunque se mencionan también los resultados globales a modo de comparación. Las conclusiones del estudio han dado como resultado la especificación de las necesidades de los usuarios, sobre cuya base se ha diseñado el módulo de soporte a la toma de decisiones. El proyecto ha concluido con una fase de evaluación del prototipo que ha implicado el desarrollo de cuatro versiones sucesivas del módulo con la finalidad de resolver los problemas presentados durante el proceso de evaluación.

Clasificación de los proyectos informáticos y establecimiento de sus EDT's

El objetivo principal del presente proyecto es plasmar una clasificación de los diferentes tipos de proyectos informáticos existentes hoy en día. Presentamos una clasificación basada en algunos criterios diferenciadores para finalmente seleccionar una tipología de proyectos informáticos fuertemente diferenciados entre sí. Posteriormente analizaremos de forma exhaustiva las diferentes etapas y fases de las que se componen, con el fin de conocer las diferentes técnicas de trabajo para la correcta consecución de cada uno de los tipos indicados.

Statistical mechanics of multi-edge networks

Statistical properties of binary complex networks are well understood and recently many attempts have been made to extend this knowledge to weighted ones. There are, however, subtle yet important considerations to be made regarding the nature of the weights used in this generalization. Weights can be either continuous or discrete magnitudes, and in the latter case, they can additionally have undistinguishable or distinguishable nature. This fact has not been addressed in the literature insofar and has deep implications on the network statistics. In this work we face this problem introducing multiedge networks as graphs where multiple (distinguishable) connections between nodes are considered. We develop a statistical mechanics framework where it is possible to get information about the most relevant observables given a large spectrum of linear and nonlinear constraints including those depending both on the number of multiedges per link and their binary projection. The latter case is particularly interesting as we show that binary projections can be understood from multiedge processes. The implications of these results are important as many real-agent-based problems mapped onto graphs require this treatment for a proper characterization of their collective behavior.

Boya

Trabajo de final de carrera incluido en el área de sistemas empotrados sobre una boya oceanográfica costera.

Binary proposal for assessing quality of Open Access Institutional Repositories : the case of Spanish repositories

The reason for this study is to propose a new quantitative approach on how to assess the quality of Open Access University Institutional Repositories. The results of this new approach are tested in the Spanish University Repositories. The assessment method is based in a binary codification of a proposal of features that objectively describes the repositories. The purposes of this method are assessing the quality and an almost automatically system for updating the data of the characteristics. First of all a database was created with the 38 Spanish institutional repositories. The variables of analysis are presented and explained either if they are coming from bibliography or are a set of new variables. Among the characteristics analyzed are the features of the software, the services of the repository, the features of the information system, the Internet visibility and the licenses of use. Results from Spanish universities ARE provided as a practical example of the assessment and for having a picture of the state of the development of the open access movement in Spain.

Robot auxiliar de limpieza de suelos doméstico

Desarrollo de un sistema robótico auxiliar de limpieza autónomo en movimiento, conectado a una red wireless, dotado de un sistema de protección contra la perdida de conexión.

Llave electrónica basada en patrones de movimiento

Sistema embebido capaz de almacenar y posteriormente reconocer patrones de movimiento realizados con él y avisar de la detección de un patrón reconocido a otro sistema mediante una conexión TCP/IP vía Wi-Fi.