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537 results on '"LENZERINI, MAURIZIO"'

1. AI-based Data Preparation and Data Analytics in Healthcare: The Case of Diabetes

Author

Maranghi, Marianna, Anagnostopoulos, Aris, Cannistraci, Irene, Chatzigiannakis, Ioannis, Croce, Federico, Di Teodoro, Giulia, Gentile, Michele, Grani, Giorgio, Lenzerini, Maurizio, Leonardi, Stefano, Mastropietro, Andrea, Palagi, Laura, Pappa, Massimiliano, Rosati, Riccardo, Valentini, Riccardo, and Velardi, Paola

Subjects
Computer Science - Machine Learning, Computer Science - Databases
Abstract

The Associazione Medici Diabetologi (AMD) collects and manages one of the largest worldwide-available collections of diabetic patient records, also known as the AMD database. This paper presents the initial results of an ongoing project whose focus is the application of Artificial Intelligence and Machine Learning techniques for conceptualizing, cleaning, and analyzing such an important and valuable dataset, with the goal of providing predictive insights to better support diabetologists in their diagnostic and therapeutic choices., Comment: The work has been presented at the conference Ital-IA 2022 (https://www.ital-ia2022.it/)

Published
2022

3. QDEF and Its Approximations in OBDM

Author

Cima, Gianluca, Croce, Federico, and Lenzerini, Maurizio

Subjects
Computer Science - Artificial Intelligence
Abstract

Given an input dataset (i.e., a set of tuples), query definability in Ontology-based Data Management (OBDM) amounts to find a query over the ontology whose certain answers coincide with the tuples in the given dataset. We refer to such a query as a characterization of the dataset with respect to the OBDM system. Our first contribution is to propose approximations of perfect characterizations in terms of recall (complete characterizations) and precision (sound characterizations). A second contribution is to present a thorough complexity analysis of three computational problems, namely verification (check whether a given query is a perfect, or an approximated characterization of a given dataset), existence (check whether a perfect, or a best approximated characterization of a given dataset exists), and computation (compute a perfect, or best approximated characterization of a given dataset)., Comment: A more compact version of this paper will be published at the proceedings of the 30th ACM International Conference on Information and Knowledge Management. The associated DOI is: https://doi.org/10.1145/3459637.34824661

Published
2021

4. Knowledge-driven Data Ecosystems Towards Data Transparency

Author

Geisler, Sandra, Vidal, Maria-Esther, Cappiello, Cinzia, Lóscio, Bernadette Farias, Gal, Avigdor, Jarke, Matthias, Lenzerini, Maurizio, Missier, Paolo, Otto, Boris, Paja, Elda, Pernici, Barbara, and Rehof, Jakob

Subjects
Computer Science - Databases
Abstract

A Data Ecosystem offers a keystone-player or alliance-driven infrastructure that enables the interaction of different stakeholders and the resolution of interoperability issues among shared data. However, despite years of research in data governance and management, trustability is still affected by the absence of transparent and traceable data-driven pipelines. In this work, we focus on requirements and challenges that data ecosystems face when ensuring data transparency. Requirements are derived from the data and organizational management, as well as from broader legal and ethical considerations. We propose a novel knowledge-driven data ecosystem architecture, providing the pillars for satisfying the analyzed requirements. We illustrate the potential of our proposal in a real-world scenario. Lastly, we discuss and rate the potential of the proposed architecture in the fulfillment of these requirements.

Published
2021

5. Ontology-Based Data Management in Healthcare: The Case of the Italian Arthroplasty Registry

Author

Valentini, Riccardo, Carrani, Eugenio, Torre, Marina, Lenzerini, Maurizio, Goos, Gerhard, Founding Editor, Hartmanis, Juris, Founding Editor, Bertino, Elisa, Editorial Board Member, Gao, Wen, Editorial Board Member, Steffen, Bernhard, Editorial Board Member, Yung, Moti, Editorial Board Member, Basili, Roberto, editor, Lembo, Domenico, editor, Limongelli, Carla, editor, and Orlandini, Andrea, editor

Published
2023
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8. From Component-Based Architectures to Microservices: A 25-years-long Journey in Designing and Realizing Service-Based Systems

Author

De Giacomo, Giuseppe, Lenzerini, Maurizio, Leotta, Francesco, Mecella, Massimo, Goos, Gerhard, Founding Editor, Hartmanis, Juris, Founding Editor, Bertino, Elisa, Editorial Board Member, Gao, Wen, Editorial Board Member, Steffen, Bernhard, Editorial Board Member, Woeginger, Gerhard, Editorial Board Member, Yung, Moti, Editorial Board Member, Aiello, Marco, editor, Bouguettaya, Athman, editor, Tamburri, Damian Andrew, editor, and van den Heuvel, Willem-Jan, editor

Published
2021
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10. Fixpoint Node Selection Query Languages for Trees

Author

Calvanese, Diego, De Giacomo, Giuseppe, Lenzerini, Maurizio, and Vardi, Moshe Y.

Subjects
Computer Science - Databases, Computer Science - Logic in Computer Science
Abstract

The study of node selection query languages for (finite) trees has been a major topic in the recent research on query languages for Web documents. On one hand, there has been an extensive study of XPath and its various extensions. On the other hand, query languages based on classical logics, such as first-order logic (FO) or Monadic Second-Order Logic (MSO), have been considered. Results in this area typically relate an XPath-based language to a classical logic. What has yet to emerge is an XPath-related language that is as expressive as MSO, and at the same time enjoys the computational properties of XPath, which are linear time query evaluation and exponential time query-containment test. In this paper we propose muXPath, which is the alternation-free fragment of XPath extended with fixpoint operators. Using two-way alternating automata, we show that this language does combine desired expressiveness and computational properties, placing it as an attractive candidate for the definite node-selection query language for trees.

Published
2015

12. The What-To-Ask Problem for Ontology-Based Peers

Author

Calvanese, Diego, De Giacomo, Giuseppe, Lembo, Domenico, Lenzerini, Maurizio, Rosati, Riccardo, Hutchison, David, Editorial Board Member, Kanade, Takeo, Editorial Board Member, Kittler, Josef, Editorial Board Member, Kleinberg, Jon M., Editorial Board Member, Mattern, Friedemann, Editorial Board Member, Mitchell, John C., Editorial Board Member, Naor, Moni, Editorial Board Member, Pandu Rangan, C., Editorial Board Member, Steffen, Bernhard, Editorial Board Member, Terzopoulos, Demetri, Editorial Board Member, Tygar, Doug, Editorial Board Member, Goos, Gerhard, Founding Editor, Hartmanis, Juris, Founding Editor, Lutz, Carsten, editor, Sattler, Uli, editor, Tinelli, Cesare, editor, Turhan, Anni-Yasmin, editor, and Wolter, Frank, editor

Published
2019
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13. Direct and Reverse Rewriting in Data Interoperability

Author

Lenzerini, Maurizio, Hutchison, David, Editorial Board Member, Kanade, Takeo, Editorial Board Member, Kittler, Josef, Editorial Board Member, Kleinberg, Jon M., Editorial Board Member, Mattern, Friedemann, Editorial Board Member, Mitchell, John C., Editorial Board Member, Naor, Moni, Editorial Board Member, Pandu Rangan, C., Editorial Board Member, Steffen, Bernhard, Editorial Board Member, Terzopoulos, Demetri, Editorial Board Member, Tygar, Doug, Editorial Board Member, Goos, Gerhard, Founding Editor, Hartmanis, Juris, Founding Editor, Giorgini, Paolo, editor, and Weber, Barbara, editor

Published
2019
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17. Using Ontologies for Semantic Data Integration

Author

De Giacomo, Giuseppe, Lembo, Domenico, Lenzerini, Maurizio, Poggi, Antonella, Rosati, Riccardo, Kacprzyk, Janusz, Series editor, Flesca, Sergio, editor, Greco, Sergio, editor, Masciari, Elio, editor, and Saccà, Domenico, editor

Published
2018
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18. A Framework for Explaining Query Answers in DL-Lite

Author

Croce, Federico, Lenzerini, Maurizio, Hutchison, David, Series Editor, Kanade, Takeo, Series Editor, Kittler, Josef, Series Editor, Kleinberg, Jon M., Series Editor, Mattern, Friedemann, Series Editor, Mitchell, John C., Series Editor, Naor, Moni, Series Editor, Pandu Rangan, C., Series Editor, Steffen, Bernhard, Series Editor, Terzopoulos, Demetri, Series Editor, Tygar, Doug, Series Editor, Weikum, Gerhard, Series Editor, Faron Zucker, Catherine, editor, Ghidini, Chiara, editor, Napoli, Amedeo, editor, and Toussaint, Yannick, editor

Published
2018
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20. On the evolution of the instance level of DL-lite knowledge bases

Author

Lenzerini, Maurizio and Savo, Domenico Fabio

Subjects
Computer Science - Artificial Intelligence
Abstract

Recent papers address the issue of updating the instance level of knowledge bases expressed in Description Logic following a model-based approach. One of the outcomes of these papers is that the result of updating a knowledge base K is generally not expressible in the Description Logic used to express K. In this paper we introduce a formula-based approach to this problem, by revisiting some research work on formula-based updates developed in the '80s, in particular the WIDTIO (When In Doubt, Throw It Out) approach. We show that our operator enjoys desirable properties, including that both insertions and deletions according to such operator can be expressed in the DL used for the original KB. Also, we present polynomial time algorithms for the evolution of the instance level knowledge bases expressed in the most expressive Description Logics of the DL-lite family.

Published
2011

21. View Synthesis from Schema Mappings

Author

Calvanese, Diego, De Giacomo, Giuseppe, Lenzerini, Maurizio, and Vardi, Moshe Y.

Subjects
Computer Science - Databases
Abstract

In data management, and in particular in data integration, data exchange, query optimization, and data privacy, the notion of view plays a central role. In several contexts, such as data integration, data mashups, and data warehousing, the need arises of designing views starting from a set of known correspondences between queries over different schemas. In this paper we deal with the issue of automating such a design process. We call this novel problem "view synthesis from schema mappings": given a set of schema mappings, each relating a query over a source schema to a query over a target schema, automatically synthesize for each source a view over the target schema in such a way that for each mapping, the query over the source is a rewriting of the query over the target wrt the synthesized views. We study view synthesis from schema mappings both in the relational setting, where queries and views are (unions of) conjunctive queries, and in the semistructured data setting, where queries and views are (two-way) regular path queries, as well as unions of conjunctions thereof. We provide techniques and complexity upper bounds for each of these cases.

Published
2010

22. Conjunctive Query Containment and Answering under Description Logics Constraints

Author

Calvanese, Diego, De Giacomo, Giuseppe, and Lenzerini, Maurizio

Subjects
Computer Science - Databases, Computer Science - Artificial Intelligence, I.2.4, F.4.1
Abstract

Query containment and query answering are two important computational tasks in databases. While query answering amounts to compute the result of a query over a database, query containment is the problem of checking whether for every database, the result of one query is a subset of the result of another query. In this paper, we deal with unions of conjunctive queries, and we address query containment and query answering under Description Logic constraints. Every such constraint is essentially an inclusion dependencies between concepts and relations, and their expressive power is due to the possibility of using complex expressions, e.g., intersection and difference of relations, special forms of quantification, regular expressions over binary relations, in the specification of the dependencies. These types of constraints capture a great variety of data models, including the relational, the entity-relationship, and the object-oriented model, all extended with various forms of constraints, and also the basic features of the ontology languages used in the context of the Semantic Web. We present the following results on both query containment and query answering. We provide a method for query containment under Description Logic constraints, thus showing that the problem is decidable, and analyze its computational complexity. We prove that query containment is undecidable in the case where we allow inequalities in the right-hand side query, even for very simple constraints and queries. We show that query answering under Description Logic constraints can be reduced to query containment, and illustrate how such a reduction provides upper bound results with respect to both combined and data complexity.

Published
2005

26. Making Metaquerying Practical for Hi(DL − Lite R ) Knowledge Bases

Author

Lenzerini, Maurizio, Lepore, Lorenzo, Poggi, Antonella, Hutchison, David, Series editor, Kanade, Takeo, Series editor, Kittler, Josef, Series editor, Kleinberg, Jon M., Series editor, Kobsa, Alfred, Series editor, Mattern, Friedemann, Series editor, Mitchell, John C., Series editor, Naor, Moni, Series editor, Nierstrasz, Oscar, Series editor, Pandu Rangan, C., Series editor, Steffen, Bernhard, Series editor, Terzopoulos, Demetri, Series editor, Tygar, Doug, Series editor, Weikum, Gerhard, Series editor, Meersman, Robert, editor, Panetto, Hervé, editor, Dillon, Tharam, editor, Missikoff, Michele, editor, Liu, Lin, editor, Pastor, Oscar, editor, Cuzzocrea, Alfredo, editor, and Sellis, Timos, editor

Published
2014
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27. Managing Data Through the Lens of an Ontology

Author

Lenzerini, Maurizio

Subjects
Information management, Company business management, Information accessibility, Business, Association for Computing Machinery -- Management
Abstract

Ontology-based data management aims at managing data through the lens of an ontology, that is, a conceptual representation of the domain of interest in the underlying information system. This new [...]

Published
2018

32. Data Warehouse Refreshment

Author

Jarke, Matthias, Lenzerini, Maurizio, Vassiliou, Yannis, Vassiliadis, Panos, Jarke, Matthias, Lenzerini, Maurizio, Vassiliou, Yannis, and Vassiliadis, Panos

Published
2003
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34. Source Integration

Author

Jarke, Matthias, Lenzerini, Maurizio, Vassiliou, Yannis, Vassiliadis, Panos, Jarke, Matthias, Lenzerini, Maurizio, Vassiliou, Yannis, and Vassiliadis, Panos

Published
2003
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37. Data Integration under Integrity Constraints

Author

Calì, Andrea, Calvanese, Diego, De Giacomo, Giuseppe, Lenzerini, Maurizio, Bubenko, Janis, editor, Krogstie, John, editor, Pastor, Oscar, editor, Pernici, Barbara, editor, Rolland, Colette, editor, and Sølvberg, Arne, editor

Published
2013
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42. Source Integration

Author

Jarke, Matthias, Lenzerini, Maurizio, Vassiliou, Yannis, Vassiliadis, Panos, Jarke, Matthias, Lenzerini, Maurizio, Vassiliou, Yannis, and Vassiliadis, Panos

Published
2000
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44. Data Warehouse Refreshment

Author

Jarke, Matthias, Lenzerini, Maurizio, Vassiliou, Yannis, Vassiliadis, Panos, Jarke, Matthias, Lenzerini, Maurizio, Vassiliou, Yannis, and Vassiliadis, Panos

Published
2000
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45. Query Rewriting for Inconsistent DL-Lite Ontologies

Author

Lembo, Domenico, Lenzerini, Maurizio, Rosati, Riccardo, Ruzzi, Marco, Savo, Domenico Fabio, Hutchison, David, Series editor, Kanade, Takeo, Series editor, Kittler, Josef, Series editor, Kleinberg, Jon M., Series editor, Mattern, Friedemann, Series editor, Mitchell, John C., Series editor, Naor, Moni, Series editor, Nierstrasz, Oscar, Series editor, Pandu Rangan, C., Series editor, Steffen, Bernhard, Series editor, Sudan, Madhu, Series editor, Terzopoulos, Demetri, Series editor, Tygar, Doug, Series editor, Vardi, Moshe Y., Series editor, Weikum, Gerhard, Series editor, Rudolph, Sebastian, editor, and Gutierrez, Claudio, editor

Published
2011
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46. Inconsistency-Tolerant Semantics for Description Logics

Author

Lembo, Domenico, Lenzerini, Maurizio, Rosati, Riccardo, Ruzzi, Marco, Savo, Domenico Fabio, Hutchison, David, editor, Kanade, Takeo, editor, Kittler, Josef, editor, Kleinberg, Jon M., editor, Mattern, Friedemann, editor, Mitchell, John C., editor, Naor, Moni, editor, Nierstrasz, Oscar, editor, Pandu Rangan, C., editor, Steffen, Bernhard, editor, Sudan, Madhu, editor, Terzopoulos, Demetri, editor, Tygar, Doug, editor, Vardi, Moshe Y., editor, Weikum, Gerhard, editor, Hitzler, Pascal, editor, and Lukasiewicz, Thomas, editor

Published
2010
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47. Using OWL in Data Integration

Author

Calvanese, Diego, De Giacomo, Giuseppe, Lembo, Domenico, Lenzerini, Maurizio, Rosati, Riccardo, Ruzzi, Marco, de Virgilio, Roberto, editor, Giunchiglia, Fausto, editor, and Tanca, Letizia, editor

Published
2010
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48. An Automata-Theoretic Approach to Regular XPath

Author

Calvanese, Diego, De Giacomo, Giuseppe, Lenzerini, Maurizio, Vardi, Moshe Y., Hutchison, David, Series editor, Kanade, Takeo, Series editor, Kittler, Josef, Series editor, Kleinberg, Jon M., Series editor, Mattern, Friedemann, Series editor, Mitchell, John C., Series editor, Naor, Moni, Series editor, Nierstrasz, Oscar, Series editor, Pandu Rangan, C., Series editor, Steffen, Bernhard, Series editor, Sudan, Madhu, Series editor, Terzopoulos, Demetri, Series editor, Tygar, Doug, Series editor, Vardi, Moshe Y., Series editor, Weikum, Gerhard, Series editor, Gardner, Philippa, editor, and Geerts, Floris, editor

Published
2009
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49. Ontologies and Databases: The DL-Lite Approach

Author

Calvanese, Diego, De Giacomo, Giuseppe, Lembo, Domenico, Lenzerini, Maurizio, Poggi, Antonella, Rodriguez-Muro, Mariano, Rosati, Riccardo, Hutchison, David, Series editor, Kanade, Takeo, Series editor, Kittler, Josef, Series editor, Kleinberg, Jon M., Series editor, Mattern, Friedemann, Series editor, Mitchell, John C., Series editor, Naor, Moni, Series editor, Nierstrasz, Oscar, Series editor, Pandu Rangan, C., Series editor, Steffen, Bernhard, Series editor, Sudan, Madhu, Series editor, Terzopoulos, Demetri, Series editor, Tygar, Doug, Series editor, Vardi, Moshe Y., Series editor, Weikum, Gerhard, Series editor, Tessaris, Sergio, editor, Franconi, Enrico, editor, Eiter, Thomas, editor, Gutierrez, Claudio, editor, Handschuh, Siegfried, editor, Rousset, Marie-Christine, editor, and Schmidt, Renate A., editor

Published
2009
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50. Conceptual Modeling for Data Integration

Author

Calvanese, Diego, De Giacomo, Giuseppe, Lembo, Domenico, Lenzerini, Maurizio, Rosati, Riccardo, Hutchison, David, Series editor, Kanade, Takeo, Series editor, Kittler, Josef, Series editor, Kleinberg, Jon M., Series editor, Mattern, Friedemann, Series editor, Mitchell, John C., Series editor, Naor, Moni, Series editor, Nierstrasz, Oscar, Series editor, Pandu Rangan, C., Series editor, Steffen, Bernhard, Series editor, Sudan, Madhu, Series editor, Terzopoulos, Demetri, Series editor, Tygar, Doug, Series editor, Vardi, Moshe Y., Series editor, Weikum, Gerhard, Series editor, Borgida, Alexander T., editor, Chaudhri, Vinay K., editor, Giorgini, Paolo, editor, and Yu, Eric S., editor

Published
2009
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