نتایج جستجو برای: temporal database

تعداد نتایج: 503431  

2004
Tony Griffiths Norman W. Paton Alvaro A. A. Fernandes Seung-Hyun Jeong Nassima Djafri

While there are many proposals for spatio-temporal data models and query languages, there is a lack of research into application development using spatio-temporal database systems. This paper seeks to redress the balance by exploring how to support database programming for spatio-temporal object databases, with specific reference to the Tripod spatio-temporal OODBMS.

1998
Martin Erwig Markus Schneider Ralf Hartmut Güting

Currently, there are strong efforts to integrate spatial and temporal database technology into spatio-temporal database systems. This paper views the topic from a rather fundamental perspective and makes several contributions. First, it reviews existing temporal and spatial data models and presents a completely new approach to temporal data modeling based on the very general notion of temporal ...

1993
MEHMET A. ORGUN

This paper introduces a temporal deductive database system featuring a logic programming language and an algebraic front-end. The language, called Temporal Datalog, is an extension of Datalog based on a simple temporal logic with two temporal operators, namely first and next. Programs of Temporal Datalog are considered as temporal deductive databases, specifying temporal relationships among dat...

2006
Alexandre Carvalho Cristina Ribeiro António Augusto de Sousa

The importance of the spatial component of data items has been long recognized and gave rise to a successful line of research and development in Geographic Information Systems (GIS). In many application domains it is also essential to deal with the evolution of data along time and to integrate spatial, temporal and other aspects of the information domain in an expressive and operationally effec...

2009
Jan Chomicki David Toman

DEFINITION The term “temporal logic” is used, in the area of formal logic, to describe systems for representing and reasoning about propositions and predicates whose truth depends on time. These systems are developed around a set of temporal connectives, such as sometime in the future or until, that provide implicit references to time instants. First-order temporal logic is a variant of tempora...

1996
Marilisa E. Carboni Annalisa Di Deo Fosca Giannotti Maria V. Masserotti

In this paper we describe our experiment using an extension of the deductive database system LDL ++ AOTZ93, AOZ93, AO93] to express situations that need spatio-temporal reasoning in Sea monitoring. The temporal extension we used is LDLT DM94], a temporal database proposal that integrates the expressiveness and deductive power of the logic language LDL NT88] with the possibility to perform tempo...

2007
Mehmet A. Orgun

] The prevailing approach to modelling the time dimension in databases is, in one form or another, the use of an explicit representation of time. In this paper we propose a temporal relational model and algebra, based on temporal semantics, to incorporate an implicit time dimension in databases. In temporal semantics, time-varying relations are an indexed collection of ordinary relations, one f...

Journal: :J. UCS 2004
Sandra de Amo Mirian Halfeld Ferrari Alves

We see a temporal data warehouse as a set of temporal views defined in the past fragment of the temporal relational algebra extended with set-valued attributes and aggregation. This paper proposes an incremental maintenance method for temporal views that allows improvements over the re-computation from scratch. We introduce a formalism for temporal data warehouse specification that summarizes i...

Journal: :Journal of the American Medical Informatics Association : JAMIA 2000
Daniel J. Nigrin Isaac S. Kohane

Most health care databases include time-stamped instant data as the only temporal representation of patient information. Many previous efforts have attempted to provide frameworks in which medical databases could be queried in relation to time. These, however, have required either a sophisticated database representation of time, including time intervals, or a time-stamp-based database coupled w...

Journal: :Proceedings. AMIA Symposium 2002
Martin J. O'Connor Samson W. Tu Mark A. Musen

Clinical databases typically contain a significant amount of temporal information. This information is often crucial in medical decision-support systems. Although temporal queries are common in clinical systems, the medical informatics field has no standard means for representing or querying temporal data. Over the past decade, the temporal database community has made a significant amount of pr...

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