By supporting the valid and transaction time dimensions, bitemporal databases represent reality more accurately than conventional databases. In this paper, we examine the issues involved in designing efficient access methods for bitemporal databases, and propose the partial-persistence and the double-tree methodologies. The partial-persistence methodology reduces bitemporal queries to partial p...

The presented data model is a novel approach for integrating temporal concepts into a multimedia database system. Multimedia objects are extended with the traditional time dimensions valid time and transaction time. In addition a new time dimension specifically tailored for multimedia data types is presented with semantics that are completely orthogonal to the already established time dimension...

In this paper we consider a class of integrity constraints which describe admissible lifecycles of database objects, and which can be speciied by transition graphs. We present an algorithmic scheme for monitoring such constraints in temporal databases which eeciently support the concept of valid-time. The keys to eecient monitoring lie in storing lifecycle situations with respect to constraints...

The input data of the corporate data warehouse is provided by the data sources, that are integrated. In the temporal database research area, a bitemporal database is a database supporting valid time and transaction time. Valid time is the time when the fact is true in the modeled reality, while transaction time is the time when the fact is stored in the database. Defining a data warehouse as a ...

It is a piece of idle senthentality that truth, merely as truth, has any inherent power denied to error, or prevailing against the dungeon and the stake. Men are not more zealous for truth than they often are for error, and a sufficient application oflegal or even of social penalties will generally succeed in stopping the propagation of either. The real advantage which truth has, consists in th...

Emil Kraepelin (1856-1926) was an influential figure in the history of psychiatry as a clinical science. This paper, after briefly presenting his biography, discusses the conceptual foundations of his concept of mental illness and follows this line of thought through to late 20th-century "Neo-Kraepelinianism," including recent criticism, particularly of the nosological dichotomy of endogenous p...

The discovery of insulin has entirely changed the prognosis of diabetes in childhood. Whereas in pre-insulin days the outlook was almost hopeless, the patient seldom lived longer than two years, the prognosis now appears to be very favourable. Growth is perfectly normal as are physical andc mental activity, and there does not appear to be any increased susceptibility to infections although the ...

The rapidity of environmental degradation and the recent popularity of the concept of sustainability have made clear how successful traditional societies have been in coexisting with nature. Architects, in responding to this rising awareness, are searching for models of the reinterpreta­ tion of tradition, seeking examples and guidelines. Three practitioners who anticipated the need for a reexa...