Relational, complex object, and object-oriented data models seem to establish three diverging directions and it appears hopeless to arrive at a new higher-level unifying data model as a new platform for the non-traditional applications as well as for the classical ones. In this paper, however, we give some evidence that recent object models can be considered as an evolution from classical ones....

This paper presents a propagation model for complex object versions. Complex objects are object linked to other objects by means of dependence relations such as composition, inheritance, association, etc. This model associates the version propagation capabilities with relations making the propagation of any type of complex object homogeneous. It can thus be distinguished from other version prop...

This paper addresses the problem of recovering object-oriented schemata from relational databases. Solutions to this problem are particularly useful for designing wrappers for federated database systems. Our goal here is to describe a reverse engineering methodology for the DOK federated database system (Tari et al. 1996), enabling the wrappers to express relational schemata as object-oriented ...

We assessed whether 2 preschoolers with autism learned to discriminate between the sounds of musical instruments more rapidly than the spoken names of the instruments. After the children learned the sound-object relations more rapidly than the name-object relations, we then evaluated a prompt-delay procedure for transferring stimulus control from the sounds to the names of the instruments. The ...

The main purpose of this paper is to develop the method of characteristic functions for calculating the detection characteristics in the case of the object surrounded by rough surfaces. This method is to be implemented in synthetic aperture radar (SAR) systems using optimal resolution algorithms. By applying the specified technique, the expressions have been obtained for the false alarm and cor...

When writing computer programs, programmers make assumptions about the relations among variables. In object-oriented programs, these assumptions include relations among the instance variables of a single object, relations often referred to as object invariants. It is a good idea to explicitly annotate a program with these assumptions. Then, a static program-analysis tool can inspect the annotat...

In 8 experiments, the authors examined the use of representations of self-to-object or object-to-object spatial relations during locomotion. Participants learned geometrically regular or irregular layouts of objects while standing at the edge or in the middle and then pointed to objects while blindfolded in 3 conditions: before turning (baseline), after rotating 240 degrees (updating), and afte...

The ability to recognize common objects from sparse information about geometric shape emerges during the same period in which children learn object names and object categories. Hummel and Biederman's (1992) theory of object recognition proposes that the geometric shapes of objects have two components-geometric volumes representing major object parts, and the spatial relations among those parts....

Constraint imperative programming is an integration of declarative constraints and imperative object-oriented programming. The primary goal of this integration is to use constraints to express relations among objects explicitly— relations that were implicit in the code in previous languages. However, one of the fundamental concepts of object-oriented programming, object identity, can result in ...