of Dissertation presented to COPPEJUFRJ as a partia1 fulfillment of the requirements for the degree of Master of Science (M.Sc.) EFFICIENT GENERATION OF MATERIALIZATION PLANS FOR ACTIVE XML DOCUMENTS Daniela Marques Pereira

Big Data query systems represent data in a columnar format for fast, selective access, and in some cases (e.g. Apache Drill), perform calculations directly on the columnar data without row materialization, avoiding runtime costs. However, many analysis procedures cannot be easily or efficiently expressed as SQL. In High Energy Physics, the majority of data processing requires nested loops with ...

The main idea in this paper is to show how flexible processes can be designed by combining generic process templates and business rules. At run time we first instantiate a process by applying rules to specific case data and using a materialization algorithm. The customized process instance is then executed in an existing workflow engine. We present an architecture and also give an algorithm for...

There is currently great interest in building information mediators that can integrate information from multiple data sources such as database systems or Web sources. An issue in building information mediators is how to make them responsive given the high response time for retrieving data from the data sources being integrated, which are databases or Web servers residing remotely. We present an...

A clear distinction generally exists between processes of design generation and processes of design production. The profusion of digital fabrication tools and technologies make evident such distinctions in the context of design production but at the same time carry potential for material and fabrication-based processes promoting generative design methods. Such strategic application and customiz...

Ontological multi-level modeling refers to describing domain objects at multiple levels of abstraction. Using traditional semantic data modeling, multi-level modeling can be achieved by representing objects in different abstraction hierarchies, classification, aggregation and generalization. Multiple representation, however, leads to accidental complexity, complicating modeling and extension. S...

In this paper we present a distributed spatial data warehouse system designed for storing and analyzing a wide range of spatial data. The data is generated by media meters working in a radio based measurement system. The distributed system is based on a new model called the cascaded star model. In order to provide satisfactory interactivity for our system, we used distributed computing supporte...

Views are an established technique for virtually restructuring data, classes, and schemata so as to meet the needs of speciic applications or users; for integrating heterogeneous and distributed systems (for example, data warehouse systems); and for achieving interoperability by hiding the idiosyncrasies of component systems to be integrated into one uniied, yet fed-erated system. Because the r...