Paolo Pisati

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We consider the problem of partitioning, in a highly accurate <i>and</i> highly efficient way, a set of <i>n</i> documents lying in a metric space into <i>k</i> non-overlapping clusters. We augment the well-known <i>furthest-point-first</i> algorithm for <i>k</i>-center clustering in metric spaces with a filtering scheme based on the triangular inequality.(More)
Packet classification is a common task in modern Internet routers. The goal is to classify packets into "classes" or "flows" according to some ruleset that looks at multiple fields of each packet. Differentiated actions can then be applied to the traffic depending on the result of the classification. Even though rulesets can be expressed in a relatively(More)
Pruritus is a common symptom in uraemic patients and its aetiology is poorly understood, although several factors have been implicated, including high histamine plasma levels. The aim of the study was to evaluate plasma levels of histamine in patients on maintenance haemodialysis in relation to the presence of itching (35 pruritic patients = group A; 50(More)
Allergic rhinitis (AR) and allergic asthma (AA) are characterized by T helper (Th)2-polarized immune response. Soluble human leukocyte antigen G (sHLA-G) molecule plays an immunomodulatory activity. Previously, it has been reported that children with AR or AA had higher sHLA-G levels in comparison with normal subjects. Thus, the present study aimed at(More)
BACKGROUND CXCL8/IL-8 is the most significant chemokine for neutrophils, and CXC chemokine receptor (CXCR) 1 and 2 are its 2 receptors, which are downmodulated by CXCL8/IL-8 and endotoxin on activated neutrophils. OBJECTIVE We sought to evaluate the expression of the CXCL8/IL-8 receptors and the activation marker CD11b on neutrophils in peripheral blood(More)
Document clustering is an effective tool to manage information overload. By grouping similardocuments together, we enable a human observer to quickly browse large document collections,make it possible to easily grasp the distinct topics and subtopics. In this Paper we survey the most important problems and techniques relatedto text information retrieval:(More)
BACKGROUND Infiltration of the airways mucosa with activated inflammatory cells appears to be a major factor in the pathogenesis of asthma and other airway diseases. Examination of sputum provides a direct method to investigate airway inflammation non-invasively. OBJECTIVES The aim of the present study was to evaluate the reproducibility of cell counts on(More)