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While trying to understand and characterize users' behavior online, the temporal dimension has received little attention by the research community. This exploratory study uses two collections of web search queries to investigate the use of temporal information needs. Using state-of-the-art information extraction techniques we identify temporal expressions(More)
In real-world information retrieval systems, the underlying document collection is rarely stable or definite. This work is focused on the study of signals extracted from the content of documents at different points in time for the purpose of weighting individual terms in a document. The basic idea behind our proposals is that terms that have existed for a(More)
Geographical Information Systems were originally intended to deal with snapshots representing a single state of some reality but there are more and more applications requiring the representation and querying of time-varying information. This work addresses the representation of moving objects on GIS. The continuous nature of movement raises problems for(More)
The fields of application of spatio-temporal systems, i.e., systems that must operate with time-varying spatial properties, are vast and heterogeneous. Since it would be difficult to treat such diversity as a whole, we introduce a classification for spatio-temporal systems based on the properties of the represented objects. Building on this classification,(More)
Research datasets in the so-called " long-tail of science " are easily lost after their primary use. Support for preservation, if available, is hard to fit in the research agenda. Our previous work has provided evidence that dataset creators are motivated to spend time on data description , especially if this also facilitates data exchange within a group or(More)
In a recent scoping study we have inquired into the data management needs of several research groups at the University of Porto and concluded that data quality and ease of on-line data manipulation are among the most valued features of a data repository. This paper describes the ensuing approach to data curation, designed to streamline the data depositing(More)
It has been shown that data management should start as early as possible in the research workflow to minimize the risks of data loss. Given the large numbers of datasets produced every day, curators may be unable to describe them all, so researchers should take an active part in the process. However, since they are not data management experts, they must be(More)
The value of research data is recognized, and so is the importance of the associated metadata to contextualize, describe and ultimately render them understandable in the long term. Laboratory notebooks are an excellent source of domain-specific metadata, but this paper-based approach can pose risks of data loss, while limiting the possibilities of(More)
This paper presents the participation of FEUP, from University of Porto, in the TREC 2008 Blog Track. FEUP participated in two tasks, the baseline adhoc retrieval task and the blog finding distillation task. Our approach was focused on the use of the temporal information available in the TREC Blog06 collection. For the baseline adhoc retrieval task a simple(More)