04b Atto di convegno in volume

Vertical separation and network investment in telecommunications
Bundling and entry deterrence in communications markets
Quasi-Newton based preconditioning and damped quasi-Newton schemes for nonlinear conjugate gradient methods

In this paper, we deal with matrix-free preconditioners for nonlinear conjugate gradient (NCG) methods. In particular, we review proposals based on quasi-Newton updates, and either satisfying the secant equation or a secant-like equation at some of the previous iterates. Conditions are given...
Preconditioning strategies for nonlinear conjugate gradient methods, based on quasi-Newton updates

This paper reports two proposals of possible preconditioners for the Nonlinear Conjugate Gradient (NCG) method, in large scale unconstrained optimization. On one hand, the common idea of our preconditioners is inspired to L-BFGS quasi–Newton updates, on the other hand we aim at explicitly...
Analyzing the main and the second order effects of operational policies on the warehouse productivity
A Comprehensive Framework for Controlled Query Evaluation, Consistent Query Answering and KB Updates in Description Logics
Ontology-Based Data Access: A Survey

We present the framework of ontology-based data access, a semantic paradigm for providing a convenient and user-friendly access to data repositories, which has been actively developed and studied in the past decade. Focusing on relational data sources, we discuss the main ingredients of ontology-...
Mapping Repair in Ontology-based Data Access Evolving Systems (Extended Abstract)
Updating DL-Lite ontologies through first-order queries
Semantic analysis of R2RML mappings for ontology-based data access

Ontology-based data access (OBDA) deals with the problem of accessing autonomous data sources through a shared, virtual ontology, and declarative mappings connecting the data sources to the ontology. The W3C standard R2RML allows for mapping relational data sources to RDFS/OWL ontologies. In this...