Showing papers by "Nigel Davies published in 1993"

Supporting Continuous Media in Open Distributed Systems Architectures

Abstract: Recent developments in high-speed networks and highperformance workstations have led to the emergence of a new class of applications termed distributed multimedia applications. However, the range of distributed systems architectures currently being proposed to support open systems integration were largely conceived prior to these developments. Initial work directed towards the introduction of multimedia in environments compatible with ISO's Open Distributed Processing (ODP) standard has suggested that significant developments to the underlying architecture are required. These developments are now being reflected in new versions of the ODP standard. However, OSF's Distributed Computing Environment (DCE), currently emerging as a de-facto standard for distributed processing, does not fully address the requirements of multimedia computing. This paper reports on the impact that multimedia has had on the ODP community and examines how the community's experiences can be used as a basis for incorporating multimedia in DCE.

Object invocation and management in the Zenith distributed multimedia information system

Abstract: Future object management systems will need to provide support for a new class of information systems: distributed multimedia design environments. Such environments pose new challenges for object management systems, requiring the integration of object-oriented techniques, distributed systems and multimedia technologies. The resulting systems must address a broad range of requirements and manage objects with a wide variety of characteristics. To meet these challenges a flexible approach to object management is required. We demonstrate how such flexibility can be achieved without incurring undue management overheads by considering the implementation of three key features of a distributed object-oriented system: persistence, object migration and access control.