Marco Pellegrini

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In the current Web scenario a video browsing tool that produces on-the-fly storyboards is more and more a need. Video summary techniques can be helpful but, due to their long processing time, they are usually unsuitable for on-the-fly usage. Therefore, it is common to produce storyboards in advance, penalizing users customization. The lack of customization(More)
Web video browsing is rapidly becoming a very popular activity in the Web scenario, causing the production of a concise video content representation a real need. Currently, static video summary techniques can be used to this aim. Unfortunately, they require long processing time and hence all the summaries are produced in advance without any users(More)
PURPOSE To compare retinal thickness measurements produced by different time-domain and spectral-domain optical coherence tomography (TD-OCT and SD-OCT) devices when imaging normal and pathologic eyes. DESIGN Prospective, observational study in an academic institutional setting. METHODS A total of 110 eyes were imaged by 6 different OCT devices: Stratus(More)
A line intersecting all polyhedra in a set ~ is called a "stabber" for the set ~. This paper addresses some combinatorial and algorithmic questions about the set 6a(~) of all lines stabbing ~. We prove that the combinatorial complexity of ~(~) has an 0(n32 c ' f~) upper bound, where n is the total number of facets in ~, and c is a suitable constant. This(More)
Let H be a collection of n hyperplanes in IR d , let A denote the arrangement of H; and let be a (d ? 1)-dimensional algebraic surface of low degree, or the boundary of a convex set in IR d. The zone of in A is the collection of cells of A crossed by. We show that the total number of faces bounding the cells of the zone of is O(n d?1 log n). More generally,(More)
Single nucleotide polymorphism (SNP) is the most frequent form of DNA variation. The set of SNP's present in a chromosome (called the em haplotype) is of interest in a wide area of applications in molecular biology and biomedicine, including diagnostic and medical therapy. In this paper we propose a new heuristic method for the problem of haplotype(More)
This paper describes Armil, a meta-search engine that groups the Web snippets returned by auxiliary search engines into disjoint labelled clusters. The cluster labels generated by Armil provide the user with a compact guide to assessing the relevance of each cluster to his/her information need. Striking the right balance between running time and cluster(More)
We <?Pub Caret>study some combinatorial and algorithmic problems onsets of lines and polyhedral objects in 3-space. Our main resultsinclude: <list><item>(1) An <inline-equation><f>O<fen lp="par">n<sup>3</sup>2<sup>c<rad><rcd><rf>log</rf>n</rcd></rad></sup><rp post="par"></fen></f></inline-equation> upper bound on the worst case complexity of the setof lines(More)
UNLABELLED Abstract Background: The role of neutrophil gelatinase-associated lipocalin (NGAL) has been described in chronic heart failure (HF), however less data are available in patients admitted for acute HF. METHODS We evaluated the role of NGAL in predicting in-hospital worsening renal function (WRF) and post-discharge follow-up during six months(More)