Software legacy problem caused by schema evolution in an object-oriented database is a very important research issue. This paper proposes a method of equivalent schema evolution based on a path-independence (PI) langu...
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This paper introduces a new model for inter-layer message communication called object mapping model that achieves separation between message preparation and destination selection. In this model, as opposed to traditio...
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In an ongoing project at NHPCC (National High Performance Computing Center) at Hefei of China, we are building a debugger for parallel/distributed programs that run on a cluster of homogeneous workstations-Dawning clu...
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This paper investigated implementation means for object query language OQL. Aiming at OQL, we treated type as monoid (collection monoid and primitive monoid), and used monoid comprehension as OQLs intermediate represe...
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This paper discusses an asynchronous event-based object-oriented framework, OVOPS, employing the usage of design patterns to incorporate and interwork with a CORBA enabled environment. Distributed programming is const...
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Command, Control, Computers, Communications, Intelligence, and Surveillance (C4ISR) systems make extensive use of geospatial and image based information. Map displays and aerial photography are often used as the backd...
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Command, Control, Computers, Communications, Intelligence, and Surveillance (C4ISR) systems make extensive use of geospatial and image based information. Map displays and aerial photography are often used as the backdrop for the display of other information in systems to assist in providing situation awareness. Given the desire to have high-resolution information, the volume and variety of geospatial information is increasing. Both commercial and experimental systems are being developed to manage, serve and process these large volumes of image and geospatial information. This paper describes the development of a dynamic server that communicates with an experimental CORBA based backend image repository, and to a JAVA map display client to deliver a virtual mosaic of the imagery within the displayed region. Since imagery is not always stored in georeferenced form we have had to provide a processing chain that maps the image coordinates to the map coordinates for display. This is implemented using the JAVA Advanced Imaging library. To reduce the footprint of the client the dynamic server that processes the imagery from the backend repository can be distributed off of the client system via an RMI connection. To maximise the interactive performance of this application various types of caching of queries and image data have been implemented.
XML (extensible Markup Language) has drawn signijicant attention as a standard for representation and exchange of data on the Web . But existing semistmctured data models, such as OEM, can not support% naturally and f...
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The evolution of software systems over many years often leads to unnecessarily complex and inflexible designs which in turn lead to a huge amount of effort for enhancements and maintenance. Thus, the reengineering of ...
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In this paper multi-agent systems ore investigated from the point of view of software architectures, and formalized using a process calculus, the pi-calculus. To build a dynamic architecture for multi-agent systems, t...
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A data warehouse is an information provider that collects necessary data jivm idvidual source databases to support the analyticalp rocessing of decision-supportf inctions. In the past, research on data warehouses prim...
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