This paper presents an integrity maintenance system that has been developed for maintaining static constraints in databases, using the active database paradigm. This system has been added to the O 2 object oriented database system, and is fully functional. Constraints are speciied by the user in a rst order logic language , and transformed in production rules, which are stored in the database. ...

java is an object-oriented program that has abundant open-source libraries for application development and 3d model rendering. spatial database is the database that can efficiently store and manage geographic information data though various spatial data management techniques. this paper explores the rationale of coupling java with spatial database to develop an effective platform for future bui...

Rapid changing business processes need an IT infrastructure that supports the cooperation of applications that are located in separated business units. This paper explores the opportunity of combining process formalisation and active database technology to support this IT infrastructural need. Both parts have to be incorporated in today's IT infrastructure to support tomorrow's business demands.

This paper presents the development and testing of a Virtual Camera (VC) system to improve astronaut and mission operations situation awareness while exploring other planetary bodies. In this embodiment, the VC is implemented using a tablet-based computer system to navigate through inter· active database application. It is claimed that the advanced interaction media capability of the VC can imp...

In this paper we take steps towards a systematic design of active features in an active database. We propose having declarative speciications that specify the objective of an active database and formulate the cor-rectness of triggers with respect to such speciications. In the process we distinguish between the notions ofìnvariance' and`maintenance' and propose four diierent classes of speciicat...

The aim of this work concerns the specification of a methodology for designing databases using the active object concept to best represent the dynamic of an information system. Two strong notions are introduced: the sensitivity and the reaction of an active object. We propose to classify real world objects following two categories: i) the structural active object that describes an object offeri...