The RM-ODP Enterprise Language comprises concepts, rules and structures for the specification of a community, where a community comprises objects (human, software, or combinations thereof) formed to meet an objective....
This paper proposes an agent-based model for providing personalized services at specific locations. We describe the concept of LBP (location-based personal) agents, point out the benefits of the model and examine impl...
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This paper proposes an agent-based model for providing personalized services at specific locations. We describe the concept of LBP (location-based personal) agents, point out the benefits of the model and examine implementation and software-infrastructural issues.
If we are stepping out of windows (of the GUI kind), what are we stepping into? We suggest it is into cooperative buildings. For the foreseeable future, at least, we can identify two major characteristics of the coope...
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If we are stepping out of windows (of the GUI kind), what are we stepping into? We suggest it is into cooperative buildings. For the foreseeable future, at least, we can identify two major characteristics of the cooperative building. The spaces of the building will be augmented in various ways, providing an ambient environment that bridges spatial discontinuities in workgroups and provides a continuous window into the state of the virtual world. Secondly, the ways in which the spaces themselves are used will evolve to be more congruent with the fluid, dynamic and distributed nature of the work taking place in the building. These two characteristics are deeply interconnected. This evolution need not happen entirely in the physical world; the essence of a cooperative building will become the way in which it mixes both physical and virtual affordances to support the workaday activities of its inhabitants.
The RM-ODP Enterprise Language comprises concepts, rules and structures for the specification of a community, where a community comprises objects (human, software, or combinations thereof) formed to meet an objective....
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The RM-ODP Enterprise Language comprises concepts, rules and structures for the specification of a community, where a community comprises objects (human, software, or combinations thereof) formed to meet an objective. The Enterprise Language focuses on the purpose, scope and policies of the community, where an enterprise policy is a set of rules with a particular objective related to the community's purpose described as obligations, prohibitions, and permissions. In order to enable adaptations of the enterprise's objectives, structure, policies and roles, we are designing a conceptual architecture with a process-oriented view of roles and policy adaptation mechanisms. Mobile enterprise objects interact with the rest of the community via processes called role-proxies.
The availability of powerful microprocessors and high-speed networks as commodity components has enabled high-performance computing on distributedsystems (wide-area cluster computing). In this environment, as the res...
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SCAF is a Simple Component Architecture Framework built upon OMG CORBA. Components are the core modelling concept. Components describe their relationship with other components by means of interface provision and requi...
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SCAF is a Simple Component Architecture Framework built upon OMG CORBA. Components are the core modelling concept. Components describe their relationship with other components by means of interface provision and requirement descriptions. These interfaces are the connectors that configure the distributed application. SCAF supports dynamic composition and encapsulation of components and has a simple matching specification for retrieval of reusable components. It has been implemented in Python on top, of an ORB (Object Request Broker) called Fnorb.
This paper presents our hybrid architectural model for distributed data mining (DDM), which is tailored to meet the needs of e-businesses in which application service providers sell DDM services to e-commerce users an...
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This paper presents our hybrid architectural model for distributed data mining (DDM), which is tailored to meet the needs of e-businesses in which application service providers sell DDM services to e-commerce users and systems. The hybrid architecture integrates the client-server and the mobile agent technologies. This model focuses on the optimisation and costing issues of DDM, which are particularly relevant in the context of billing users for data mining services.
The availability of powerful microprocessors and high-speed networks as commodity components has enabled high-performance computing on distributedsystems (wide-area cluster computing). In this environment, as the res...
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The availability of powerful microprocessors and high-speed networks as commodity components has enabled high-performance computing on distributedsystems (wide-area cluster computing). In this environment, as the resources are usually distributed geographically at various levels (department, enterprise or worldwide), there is a great challenge in integrating, coordinating and presenting them as a single resource to the user, thus forming a computational grid. Another challenge comes from the distributed ownership of resources, with each resource having its own access policy, cost and mechanism. The proposed Nimrod/G grid-enabled resource management and scheduling system builds on our earlier work on Nimrod (D. Abramson et al., 1994, 1995, 1997, 2000) and follows a modular and component-based architecture enabling extensibility, portability, ease of development, and interoperability of independently developed components. It uses the GUSTO (GlobUS TOolkit) services and can be easily extended to operate with any other emerging grid middleware services. It focuses on the management and scheduling of computations over dynamic resources scattered geographically across the Internet at department, enterprise or global levels, with particular emphasis on developing scheduling schemes based on the concept of computational economy for a real testbed, namely the Globus testbed (GUSTO).
Scalability is recognised as a primary factor to be considered in the design of distributedsystems. The scalability of object-oriented middleware CORBA is becoming a major concern as it has emerged as a standard arch...
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Scalability is recognised as a primary factor to be considered in the design of distributedsystems. The scalability of object-oriented middleware CORBA is becoming a major concern as it has emerged as a standard architecture for distributed object computing. In this paper, a systematic scalability analysis of the basic components of the CORBA specification is attempted. From this analysis, the Portable Object Adapter (POA) and the Implementation Repository (IR) are identified to influence the scale of a CORBA-based system. The specification of the POA provides enough feasibility for the application designer to handle scalability. The existing implementations of IR have a tradeoff between scalability and object migration. A scalable design of the IR is proposed which allows individual objects to migrate without compromising scalability. A performance comparison of the proposed model with existing IR designs is made using a simulation study.
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