There is a widespread recognition that valid and transaction times are the fundamental temporal dimensions of any fact relative to a database. There are, however, temporal aspects of facts that cannot be naturally modeled by means of them. A remarkable limitation of valid and transaction times is that they do not allow one to distinguish between retroactive and delayed updates. A third temporal dimension, called event time, has been proposed in the literature, which makes it possible to model retroactive, on-time, and proactive updates.
In this talk, we first refine the notion of event time by showing that one event time does not suffice to model relevant phenomena, and then we introduce a further temporal dimension, that we called availability time, which can be viewed as the information system counterpart of the real-world event time. We conclude the talk by outlining current and future work directions.
Angelo Montanari is associate professor of computer science at the University of Udine, Italy. He is the deputy head of the Department of Mathematics and Computer Science and the head of the Database and Multimedia Systems Laboratory.
His main research interests include:
(a) temporal databases;
(b) languages, methodologies, techniques, and tools for program/system
specification, verification, and validation;
(c) automated reasoning in modal and temporal logics;
(d) temporal representation and reasoning.
He is currently teaching courses on databases and information systems, and on temporal logics and automata for reactive systems.
He is author of over 100 papers published in international journals, books, and conference/workshop proceedings.
Since late '80s, he was involved in several national and international research projects in computer science.
Sprecher: Angelo Montanari University of Udine Deputy head of the Department of Mathematics and Computer Science and head of the Database and Multimedia Systems Laboratory Wann: Freitag, 15. November 2002, 14:00 (s.t.) Wo: SR-E 2.42, Universität Klagenfurt