Effect of the Si/B ratio on the magnetic anisotropy distribution of Fe73.5Si22.52xBxCu1Nb3 „x57,9,16… alloys along nanocrystallization

The effect of the Si/B ratio on the magnetic anisotropy distribution of Fe73.5Si22.52xBxCu1Nb3 (x57,9,16) alloys has been studied. The influence of isochronal annealing on the hysteresis loop of the three studied alloys has been analyzed. They present two minima in coercivity: the first one can be ascribed to structural relaxation, and the second one is related to the averaging of the magnetocrystalline anisotropy, as predicted by the random anisotropy model. The relative importance of both minima changes with Si content: the lower the Si content, the more effective the structural relaxation and the less important the second minimum are. The mean value of the magnetic anisotropy distribution presents a similar behavior, evidencing the growing importance of the magnetoelastic anisotropy for the relaxed amorphous samples as the Si content is increased. From the evolution of the magnetic anisotropy distribution along nanocrystallization and the microstructural information obtained from transmission electron microscopy images, the behavior of the coercivity minima with changes in Si content can be ascribed to a different degree in compensation of magnetoelastic anisotropy due to the contributions of different signs coming from the nanocrystals and the amorphous matrixCICYT. Gobierno Español-MAT95-0961-CO2-0

Humanización en la asistencia clínica oncológica

Sin resume

Efficient memory management in VOD disk array servers usingPer-Storage-Device buffering

We present a buffering technique that reduces video-on-demand server memory requirements in more than one order of magnitude. This technique, Per-Storage-Device Buffering (PSDB), is based on the allocation of a fixed number of buffers per storage device, as opposed to existing solutions based on per-stream buffering allocation. The combination of this technique with disk array servers is studied in detail, as well as the influence of Variable Bit Streams. We also present an interleaved data placement strategy, Constant Time Length Declustering, that results in optimal performance in the service of VBR streams. PSDB is evaluated by extensive simulation of a disk array server model that incorporates a simulation based admission test.This research was supported in part by the National R&D Program of Spain, Project Number TIC97-0438.Publicad

Implementation of a Hardware/Software Platform for Real-Timedata-Intensive Applications in Hazardous Environments

Real-Time Technology and Applications Symposium. Brookline, MA, USA, 10-12 Oct. 1996In real-time data-intensive applications, the simultaneous achievement of the required performance and determinism is a difficult issue to address, mainly due to the time needed to perform I/O operations, which is more significant than the CPU processing time. Additional features need to be considered if these applications are intended to perform in hostile environments. In this paper, we address the implementation of a hardware/software platform designed to acquire, transfer, process and store massive amounts of information at sustained rates of several MBytes/sec, capable of supporting real-time applications with stringent throughput requirements under hazardous environmental conditions. A real-world system devoted to the inspection of nuclear power plants is presented as an illustrative examplePublicad

A comprehensive approach in performance evaluation for modernreal-time operating systems

In real-time computing the accurate characterization of the performance and determinism that a particular real-time operating system/hardware combination can provide for real-time applications is essential. This issue is not properly addressed by existing performance metrics mainly due to the lack of completeness and generalization. In this paper we present a set of comprehensive, easy-to-implement and useful metrics covering three basic real-time operating system features: response to external events, intertask synchronization and resource sharing, and intertask data transferring. The evaluation of real-time operating systems using a set of fine-grained metrics is fundamental to guarantee that we can reach the required determinism in real-world applications.Publicad

Efficient memory management in video on demand servers

In this article we present, analyse and evaluate a new memory management technique for video-on-demand servers. Our proposal, Memory Reservation Per Storage Device (MRPSD), relies on the allocation of a fixed, small number of memory buffers per storage device. Selecting adequate scheduling algorithms, information storage strategies and admission control mechanisms, we demonstrate that MRPSD is suited for the deterministic service of variable bit rate streams to intolerant clients. MRPSD allows large memory savings compared to traditional memory management techniques, based on the allocation of a certain amount of memory per client served, without a significant performance penaltyPublicad

Criminal Justice Systems in Europe. A cross-national quantitative analysis

In the last years, the Crime Observatory of the University of Malaga has analysed police records on criminal activity, has also carried out several crime victims surveys in Spain and has worked on a detailed analysis of the prison system and its connection to the prison policy. This year´s report focuses on the Criminal Justice System, one of the big official data providers, to gather, organize and interpret a great deal of quantitative data from 2000 to 2011. Such longitudinal scrutiny offers data related to public opinion about criminal courts, the quality of criminal justice, its resources, the amount of criminal cases managed on each court, a user´s profile, etc. On this presentation, we´ll concentrate on a comparison of the European countries that constitutes the first chapter of the Report and aims to offer a proper context to the rest of it. Such comparison will explain the national differences in terms of the public budget allocated to courts, legal aid, court fees, incoming criminal cases, length of procedures, clearance rate, as well as homicide, rape, serious assault and robbery convictions, etc. Our aim will be to offer an interesting cross-national analysis of such topics that will provide a reference point from which to debate the national policies related to the Criminal Justice System in the European Countries.Instituto Andaluz Interuniversitario de Criminología. Sección de Málag

Ballast Control Analysis of a Floating Dock under Accidental Conditions

Floating docks play a critical role in the maintenance and inspection of submerged sections of ships. However, their operational complexity requires the expertise of a skilled dock master to develop an optimal ballast plan that minimizes heeling and trimming during operations. Unfortunately, recent years have witnessed several accidents involving floating docks, often attributable to component failures or human errors. To address these risks and proactively detect potential dock failures, an automatic controller for floating docks has been developed. The proposed modified P-controller serves as a valuable tool for facilitating both ballasting and de-ballasting operations while effectively maintaining the dock's roll and pitch angles close to zero, even when a vessel is docked on deck. To evaluate the controller's effectiveness, it is tested under various conditions, including scenarios where certain components of the ballast water system are non-functional. During the de-ballasting process, the dock successfully completes the operation. However, the closure of at least two tanks within the same circuit results in significant pitch angles, indicating a limitation of the controller under these conditions. Similarly, in the ballasting process without a docked vessel, the controller performs satisfactorily. However, when a vessel is present, the dock fails to achieve the desired draught of 10.1 m. These observations provide valuable insights into the potential benefits and limitations of the proposed automatic controller for floating docks. These findings underscore the importance of further research and development in this field to enhance the performance and capabilities of automatic controllers for floating docks. By addressing the limitations identified and refining the controller's functionality, the safety and efficiency of floating dock operations can be significantly improved

A case study for measuring informal learning in PLEs

The technological support for learning and teaching processes is constantly changing. Information and Communication Technologies (ICT) applied to education, cause changes that affect the way in which people learn. This application introduces new software systems and solutions to carry out teaching and learning activities. Connected to ICT application, the emergence of Web 2.0 and its use in learning contexts enables an online implementation of the student-centred learning paradigm. In addition, 2.0 trends provide “new” ways to exchange, making easier for informal learning to become patent. Given this context, open and user-centered learning environments are needed to integrate such kinds of tools and trends and are commonly described as Personal Learning Environments. Such environments coexist with the institutional learning management systems and they should interact and exchange information between them. This interaction would allow the assessment of what happens in the personal environment from the institutional side. This article describes a solution to make the interoperability possible between these systems. It is based on a set of interoperability scenarios and some components and communication channels. In order to test the solution it is implemented as a proof of concept and the scenarios are validated through several pilot experiences. In this article one of such scenarios and its evaluation experiment is described to conclude that functionalities from the institutional environments and the personal ones can be combined and it is possible to assess what happens in the activities based on them.Peer ReviewedPostprint (published version