José María Pérez

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Data replication is a practical and effective method to achieve efficient and fault-tolerant data access in grids. Traditionally, data replication schemes maintain an entire replica in each site where a file is replicated, providing a read-only model. These solutions require huge storage resources to store the whole set of replicas and do not allow(More)
Functional requirements for information systems can be modeled through use cases. Furthermore, use case models have been successfully used in broader contexts than software engineering, as systems engineering. Even if small systems may be modeled as a set of use cases, when large systems requirements are modeled with a plain use case model several(More)
Every storage platform intended to fit the requirements of the multimedia systems must incorporate a disk scheduling mechanism and a cache architecture that can handle their special needs. On the other hand, the general trend is to make integrated storage platforms that meet the requirements of deterministic applications, multimedia systems, and traditional(More)
Nowadays, multimedia systems are evolving towards integratedstorage platforms that meet the requirements ofdeterministic applications, multimedia systems, and traditionalbest-effort applications altogether. These systemsmust incorporate a disk scheduling mechanism and a cachearchitecture that can handle the requirements of each kindof request while showing(More)
BACKGROUND We performed this observational prospective study to evaluate the results of the application of a diagnostic and therapeutic algorithm for complicated parapneumonic pleural effusion (CPPE) and pleural parapneumonic empyema (PPE). MATERIAL/METHODS From 2001 to 2007, 210 patients with CPPE and PPE were confirmed through thoracocentesis and(More)