Luis Daniel Ibáñez

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There has been an explosion of hyperlinked data in many domains, e.g., the biological Web. Expressive query languages and effective ranking techniques are required to convert this data into browsable knowledge. We propose the Graph Information Discovery (GID) framework to support sophisticated user queries on a rich web of annotated and hyperlinked data(More)
Social semantic web technologies led to huge amounts of data and information being available. The production of knowledge from this information is challenging, and major efforts, like DBpedia, has been done to make it reality. Linked data provides interconnection between this information, extending the scope of the knowledge production. The knowledge(More)
The Local-As-View (LAV) integration approach aims at querying heterogeneous data in dynamic environments. In LAV, data sources are described as views over a global schema which is used to pose queries. Query processing requires to generate and execute query rewritings, but for SPARQL queries, the LAV query rewritings may not be generated or executed in a(More)
Local-As-View (LAV) mediators provide a uniform interface to a federation of heterogeneous data sources to attempt the execution of queries against the federation. LAV mediators rely on query rewriters to translate mediator queries into equivalent queries on the federated data sources. The query rewriting problem in LAV mediators has shown to be(More)
Under the umbrella of the Semantic Web, Linking Open Data projects have made available a large number of semantically intraand inter-connected links. As an example, in the biomedical domain, data about disorders, disease related genes and proteins, clinical trials, and drugs or interventions are accessible on the Linked Open Data cloud. In addition, domain(More)
Cryptocurrencies like Bitcoin have provided a platform for parties to transfer digital value in a decentralised way. However, to support scalability, the amount of extra data that can be attached to a transaction is very limited, greatly limiting the possibility of attaching descriptive metadata to them with the same guarantees that the Blockchain In this(More)