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Advanced Traveler Information Systems (ATIS) require efficient information retrieval and updating in a dynamic environment at different geographical scales. ATIS applications are useful in yielding a better utilization of the limited costly transportation arteries and providing value-added traveler...

The management of organizational knowledge has become increasingly important since knowledge was identified as the new basis of competition in post-industrial society. One of the key issues in knowledge management is to put knowledge into a repository where it can be easily stored, reused and...

In this paper, we propose a model of schema versions for object-oriented databases called RiBS. At the heart of this model is the concept of the Rich Base Schema (RiBS). Each schema version is in the form of a class hierarchy view over one base schema, RiBS, which accumulates all the schema information...

We propose new criteria for the classification of systems for database cooperation, based on the nature of the component databases. In fact, the traditional criteria - heterogeneity, distribution, and autonomy - are often constraints for the design process, rather than design parameters. In this case...

Little work has been completed which addresses the logical composition and use of ternary relationships in entity-relationship modeling. Many modeling notations and most CASE tools do not allow for ternary relationships. Alternative methods and substitutes for ternary relationship structures do not...

We present a model that simplifies the formulation of a wide range of complex, mainly selection-based, object-oriented queries, including linear recursive queries. They are complex because it is almost impossible for naive users to predict the formulation of their predicate expressions. Naive users are...

Modeling behavior is an important task of the information system engineering process. This task is especially important when information systems are centered on active databases, which allow the replacement of parts of application programs with active rules. To relieve programmers from using either...

We present in this paper a generic object-oriented benchmark (OCB: the Object Clustering Benchmark) that has been designed to evaluate the performances of Object-Oriented Databases (OODBs), and more specifically the performances of clustering policies within OODBs. OCB is generic because its sample...

The S-tree is a dynamic height-balanced tree similar in structure to B+trees. S-trees store fixed length bit-strings, which are called signatures. Signatures are used for indexing textbases, relational, object oriented and extensible databases as well as in data mining. In this article, methods of...

Formal methods, whereby a system is described and/or analyzed using precise mathematical techniques, is a well -established and yet, under-used approach for developing software systems. One of the reasons for this is that project deadlines often impose an unsatisfactory development strategy in which...

This paper presents a conceptual modeling language for spatiotemporal applications that offers built-in support for capturing spatially referenced, time-varying information. More specifically, the well-known object-oriented Unified Modeling Language (UML) is extended to capture the semantics of...

A use case is a description of a sequence of actions constituting a complete task or transaction in an application. Use cases were first proposed by Jacobson (1987) and have since been incorporated as one of the key modeling constructs in UML (Booch, Jacobson, & Rumbaugh, 1999) and the Unified Software...