Luigi Palopoli

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Aswani Kumar Cherukuri

VIT University

Stephen Yablo

Massachusetts Institute of Technology (MIT)

John Sutton

Macquarie University

Eros Carvalho

Universidade Federal do Rio Grande do Sul

Roshan Chitrakar

Nepal College of Information Technology

Norbertus Tri Suswanto Saptadi

Universitas Atma Jaya Makassar

Simone Penasa

University of Trento

Yanina Welp

Graduate Institute of International and Development Studies (IHEID), Geneva

Viacheslav Kuleshov

Stockholm University

Dr. Shadab Alam

Jazan University

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Papers by Luigi Palopoli

Agents' roles in B2C e-commerce

Ai Communications, 2006

The rapid evolution of the Internet from a general information space to an electronic market spac... more

A Plausibility Description Logics for Reasoning with Information Sources Having Different Formats and Structures

ABSTRACT The aim of this paper is to illustrate how a probabilistic Description Logics, called DL... more ABSTRACT The aim of this paper is to illustrate how a probabilistic Description Logics, called DL P, can be exploited for reasoning about information sources characterized by heterogeneous formats and structures. The paper first introduces DL P syntax and semantics. Then, a DL P-based approach is illustrated for inferring complex knowledge assertions from information sources characterized by heterogeneities in formats and representational structures. The thus obtained complex knowledge assertions can be exploited for constructing a user profile and for improving the quality of present Web search tools.

Progettazione semi-automatica di data warehouse di grandi dimensioni

Atti del Congresso su Sistemi Evoluti per Basi di Dati ( …

Estrazione semi-automatica e semantica di proprieta terminologiche e strutturali tra oggetti di schemi di basi di dati federate. Semi-automatic, semantic extraction of terminological and structural properties between scheme objects of federated databases

An architecture for accessing a large number of autonomous, heterogeneous databases

ABSTRACT In this paper an architecture supporting Internet-based integrated access to heterogeneo... more ABSTRACT In this paper an architecture supporting Internet-based integrated access to heterogeneous, autonomous distributed databases is illustrated. The proposed architecture is two-tier and can be seen as a variant of the well-known mediator-based one. The main feature of this architecture is that it is specifically conceived to realize very large systems, comprising hundreds of local databases. A structured, hierarchical global scheme, called data repository, is adopted as the core structure to guarantee friendly access to available data through a graphical Web interface. The architecture described here has been implemented in a system, called NET R, constructed on top of the set of databases owned by Italian Central Government offices.

Automatic extraction of database scheme semantic properties using knowledge discovery techniques

ABSTRACT This paper deals with the derivation of complex properties relating objects belonging to... more ABSTRACT This paper deals with the derivation of complex properties relating objects belonging to a set of database schemes and the exploitation of derived properties in query optimization and view maintenance problems. The derivation process has an iterative nature and works by case analysis over database schemes, in a way somehow similar to the way knowledge discovery processes behave on database extensions: for this reason, we call it Intentional Knowledge Discovery. Complex properties have a fuzzy nature and are represented and manipulated using a fuzzy variant of Description Logics. The paper presents detailed descriptions of procedures used to derive complex properties. As far as applications are concerned, the paper illustrates several query optimization cases and a view maintenance algorithm both based on the availability of extracted complex properties.

Discovering Description Logic assertions from database schemes

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Modeling Web-search scenarios exploiting user and source profiles

... ing.unirc.it. Domenico Rosaci, DIMET, Università Mediterranea di Reggio Calabria, Via Graziel... more

The system DIKE: towards the semi-automatic synthesis of cooperative information systems and data warehouses

Modeling Web-search scenarios exploiting user and source profiles

Ai Communications, Dec 1, 2001

... ing.unirc.it. Domenico Rosaci, DIMET, Università Mediterranea di Reggio Calabria, Via Graziel... more

Agents' roles in B2C e-commerce

Ai Communications, 2006

The rapid evolution of the Internet from a general information space to an electronic market spac... more

Semi-automatic construction of a Data Warehouse from numerous large databases

A graph-based approach for extracting terminological properties from information sources with heterogeneous formats

Knowledge and Information Systems, Feb 21, 2005

Abstract The problem of handling both the integration and the cooperation of a large number of in... more

Outlying Property Detection with Numerical Attributes

arXiv (Cornell University), Jun 15, 2013

The outlying property detection problem is the problem of discovering the properties distinguishi... more The outlying property detection problem is the problem of discovering the properties distinguishing a given object, known in advance to be an outlier in a database, from the other database objects. In this paper, we analyze the problem within a context where numerical attributes are taken into account, which represents a relevant case left open in the literature. We introduce a measure to quantify the degree the outlierness of an object, which is associated with the relative likelihood of the value, compared to the to the relative likelihood of other objects in the database. As a major contribution, we present an efficient algorithm to compute the outlierness relative to significant subsets of the data. The latter subsets are characterized in a rule-based fashion, and hence the basis for the underlying explanation of the outlierness.

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Detecting and Repairing Anomalous Evolutions in Noisy Environments: Logic Programming Formalization and Complexity Results

Springer eBooks, Oct 8, 2006

In systems where agents are required to interact with a partially known and dynamic world, sensor... more In systems where agents are required to interact with a partially known and dynamic world, sensors can be used to obtain further knowledge about the environment. However, sensors may be unreliable, that is, they may deliver wrong information (due, e.g., to hardware or software malfunctioning) and, consequently, they may cause agents to take wrong decisions, which is a scenario that should be avoided. The paper considers the problem of reasoning in noisy environments in a setting where no (either certain or probabilistic) data is available in advance about the reliability of sensors. Therefore, assuming that each agent is equipped with a background theory (in our setting, an extended logic program) encoding its general knowledge about the world, we define a concept of detecting an anomaly perceived in sensor data and the related concept of agent recovering to a coherent status of information. In this context, the complexities of various anomaly detection and anomaly recovery problems are studied.

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Outlier Detection by Logic Programming

arXiv (Cornell University), Sep 9, 2004

The development of effective knowledge discovery techniques has become a very active research are... more The development of effective knowledge discovery techniques has become a very active research area in recent years due to the important impact it has had in several relevant application domains. One interesting task therein is that of singling out anomalous individuals from a given population, e.g., to detect rare events in timeseries analysis settings, or to identify objects whose behavior is deviant w.r.t. a codified standard set of rules. Such exceptional individuals are usually referred to as outliers in the literature. In this paper, the concept of outlier is formally stated in the context of knowledge-based systems, by generalizing that originally proposed in in the context of default theories. The chosen formal framework here is that of logic programming, wherein potential applications of techniques for outlier detection are thoroughly discussed. The proposed formalization is a novel one and helps to shed light on the nature of outliers occurring in logic bases. Also the exploitation of minimality criteria in outlier detection is illustrated. The computational complexity of outlier detection problems arising in this novel setting is also thoroughly investigated and accounted for in the paper. Finally, rewriting algorithms are proposed that transform any outlier detection problem into an equivalent inference problem under stable model semantics, thereby making outlier computation effective and realizable on top of any stable model solver.

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A graph-based approach for extracting terminological properties of elements of XML documents

XML is rapidly becoming a standard for information exchange over the Web. Web providers and appli... more XML is rapidly becoming a standard for information exchange over the Web. Web providers and applications using XML for representing and exchanging their data make their information available in such a way that interoperability can be easily reached. However in order to guarantee both the exchange of XML documents and the interoperability between information providers, it is often needed to

The System DIKE: Towards the Semi-Automatic Synthesis of Cooperative Information Systems and Data Warehouses

A Tour from Regularities to Exceptions

Studies in big data, May 31, 2017

The enormous growth of information available in database systems has led to a significant develop... more The enormous growth of information available in database systems has led to a significant development of techniques for knowledge discovery. At the heart of the knowledge discovery process is the application of data mining algorithms in charge of extracting hidden relationships among pieces of stored information. Information thus extracted from databases have widespread use in great many application domains and contexts.

Un modello concettuale per rappresentare e derivare la semantica associata a sorgenti informative strutturate e semi-strutturate

SEBD, 2001

Agents' roles in B2C e-commerce

Ai Communications, 2006

The rapid evolution of the Internet from a general information space to an electronic market spac... more

A Plausibility Description Logics for Reasoning with Information Sources Having Different Formats and Structures

Progettazione semi-automatica di data warehouse di grandi dimensioni

Atti del Congresso su Sistemi Evoluti per Basi di Dati ( …

An architecture for accessing a large number of autonomous, heterogeneous databases

Automatic extraction of database scheme semantic properties using knowledge discovery techniques

Discovering Description Logic assertions from database schemes

Download

Modeling Web-search scenarios exploiting user and source profiles

... ing.unirc.it. Domenico Rosaci, DIMET, Università Mediterranea di Reggio Calabria, Via Graziel... more

The system DIKE: towards the semi-automatic synthesis of cooperative information systems and data warehouses

Modeling Web-search scenarios exploiting user and source profiles

Ai Communications, Dec 1, 2001

... ing.unirc.it. Domenico Rosaci, DIMET, Università Mediterranea di Reggio Calabria, Via Graziel... more

Agents' roles in B2C e-commerce

Ai Communications, 2006

The rapid evolution of the Internet from a general information space to an electronic market spac... more

Semi-automatic construction of a Data Warehouse from numerous large databases

A graph-based approach for extracting terminological properties from information sources with heterogeneous formats

Knowledge and Information Systems, Feb 21, 2005

Abstract The problem of handling both the integration and the cooperation of a large number of in... more

Outlying Property Detection with Numerical Attributes

arXiv (Cornell University), Jun 15, 2013

Download

Detecting and Repairing Anomalous Evolutions in Noisy Environments: Logic Programming Formalization and Complexity Results

Springer eBooks, Oct 8, 2006

Download

Outlier Detection by Logic Programming

arXiv (Cornell University), Sep 9, 2004

Download

A graph-based approach for extracting terminological properties of elements of XML documents

The System DIKE: Towards the Semi-Automatic Synthesis of Cooperative Information Systems and Data Warehouses

A Tour from Regularities to Exceptions

Studies in big data, May 31, 2017

Un modello concettuale per rappresentare e derivare la semantica associata a sorgenti informative strutturate e semi-strutturate

SEBD, 2001

Luigi Palopoli

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