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  • A Distributed Infrastructure for Earth-Science Big Data Retrieval

    Earth-Science data are composite, multidimensional and of significant size, and as such, continue to pose a number of on-going problems regarding their management. With new and diverse information sources emerging as well as rates of generated data continuously increasing, a persistent challenge becomes more pressing: to make the information existing in multiple heterogeneous resources readily available. The widespread use of the XML data-exchange format has enabled the rapid accumulation of semi-structured metadata for Earth-Science data.

  • Big Data Analytics for Earth Sciences: the EarthServer approach

    Big Data Analytics is an emerging field since massive storage and computing capabilities have been made available by advanced e-infrastructures. Earth and Environmental sciences are likely to benefit from Big Data Analytics techniques supporting the processing of the large number of Earth Observation datasets currently acquired and generated through observations and simulations. However, Earth Science data and applications present specificities in terms of relevance of the geospatial information, wide heterogeneity of data models and formats, and complexity of processing.

  • xWCPS: Bridging the Gap Between Array and Semi-structured Data

    The ever growing amount of information collected by scientific instruments and the presence of descriptive metadata accompanying them calls for a unified way of querying over array and semi-structured data. We present xWCPS, a novel query language that bridges the path between these two different worlds, enhancing the expressiveness and user-friendliness of previous approaches.

  • Technoeconomic analysis of PON architectures for FTTH deployments (Next Generation access networks)

    In this paper the cost for the deployment of a PON FTTH network is calculated in terms of NPV, IRR and payback period. A comparison is made between three PON technologies: GPON, XGPON and NG-PON2. Different scenarios regarding population density and bitrates are examined. It is shown that for high data rate scenarios in areas with high population density NG-PON2 can become a viable and future proof alternative to GPON and XGPON.

  • Dataflow Processing and Optimization on Grid and Cloud

    Complex on-demand data retrieval and processing is a characteristic of several applications and combines the notions of querying & search, information filtering & retrieval, data transformation & analysis, and other data manipulations. Such rich tasks are typically represented by data processing graphs, having arbitrary data operators as nodes and their producer-consumer interactions as edges.

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