Most recent advances in the areas of networking and Internet/Web related technologies have inspired a new model of computing, namely the network-centric computing model. This paper describes a network-centric open sof...
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Most recent advances in the areas of networking and Internet/Web related technologies have inspired a new model of computing, namely the network-centric computing model. This paper describes a network-centric open software architecture for distributed peer to peer systems development. The goal of this architecture is to provide asynchronous concurrent message-based design that is highly configurable. Some of the applications that are built on top of this software architecture is also discussed here.
In this paper, novel methods for performing condition monitoring for power station turbine shafts are presented. The objective of this work is to investigate methods for producing accurate turbine vibration fault alar...
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In this paper, novel methods for performing condition monitoring for power station turbine shafts are presented. The objective of this work is to investigate methods for producing accurate turbine vibration fault alarms during turbine shaft rundowns. Wavelet packet analysis is employed to extract spectral features from healthy vibration signals and the probability density functions of these features are estimated. Both Gaussian models, using Bayesian inferencing, and mixture models are employed. Preliminary results show that the more computationally expensive mixture models produce more accurate density estimates and hence more reliable fault alarms.
There is an emerging desire among agent researchers to move away from developing point solutions to point problems in favour of developing methodologies and tool-kits for building distributed multi-agent systems. This...
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There is an emerging desire among agent researchers to move away from developing point solutions to point problems in favour of developing methodologies and tool-kits for building distributed multi-agent systems. This philosophy has led to the development of the ZEUS agent building tool-kit, which facilitates the engineering of collaborative agent applications through the provision of a library of agent-level components and an environment to support the agent building process. The ZEUS tool-kit is a synthesis of established agent technologies with some novel solutions that provide an integrated environment for rapid software engineering of collaborative agent applications.
The provision of services such as credit card facilities using Intelligent networks (IN) depends upon the ability to process real-time data. If their data is deliberately delayed during transit, these services may not...
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The provision of services such as credit card facilities using Intelligent networks (IN) depends upon the ability to process real-time data. If their data is deliberately delayed during transit, these services may not be able to function accurately. This paper examines INs and highlights their vulnerability to network delay attacks. In particular, the nature of rear-time communications and the main approach that has been developed to determine whether received data is being sent in real-time or not is discussed. The deficiencies in this approach in terms of its ability to counteract the different forms of a network delay attack are highlighted and an alternative method which addresses these drawbacks is presented. Finally, the results achieved following the implementation and subsequent testing of the alternative approach are discussed. (C) 1997 Elsevier science B.V.
Several international standards for asynchronous data compression are available today. In 1993 the International Telecommunication Union (ITU) started to research possible ways to compress synchronous data. Special at...
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Several international standards for asynchronous data compression are available today. In 1993 the International Telecommunication Union (ITU) started to research possible ways to compress synchronous data. Special attention was given to compatibility with previous asynchronous standards, namely V.42bis. In September 1993 a proposal for modification of the V.42bis standard to make ii applicable to synchronous data was published. In this paper a prototype of a synchronous data link layer protocol based on the ITU proposals is described. The protocol chosen is HDLC based. The V.42bis compression standard is adapted to serve the needs of a synchronous protocol. A functional model is designed followed by a performance analysis of the protocol. The analysis shows a decrease of the compression ratio due to the adaption of the compression algorithm. (C) 1997 Elsevier science B.V.
Applications that cross the boundaries of different computing machines, operating systems, and programming languages are increasingly the norm. As a result, the need for what might be called bridging technologies to d...
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Applications that cross the boundaries of different computing machines, operating systems, and programming languages are increasingly the norm. As a result, the need for what might be called bridging technologies to develop software that works across heterogeneous environments has become more compelling. The Common Object Request Broker Architecture is one such technology that is both robust and commercially available. CORBA essentially describes how client applications can invoke operations on server objects using the services of an intermediary known as an Object Request Broker, or ORB. This article introduces CORBA by describing its key components. It then reviews the boundaries it helps to bridge. It concludes by comparing CORBA with a number of other bridging technologies available today.
Effective communication requires support for interactive (e.g. telephony) as well as message-based (e.g. electronic mail, fax) communication. Message-based communication has the advantage for users in that it allows t...
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Effective communication requires support for interactive (e.g. telephony) as well as message-based (e.g. electronic mail, fax) communication. Message-based communication has the advantage for users in that it allows the recipient to answer and react to incoming correspondences when it suits them. Given the number of varying and differing message-based communication systems available and used these days, it is becoming necessary for users to flurry through an increasing array of 'mail boxes'. This leads to much unnecessary time being spent sorting and filing such messages into separated folders, file systems, etc. This paper introduces the basis for a Personal Message Centre (PMC). The PMC provides its users with one common message store for ail message communications. In addition, PMC users will have the possibility to access such a common message store from a range of terminal types, such as computer terminals, mobile/fixed fixed telephones. Users will be provided with a range of services to assist them in their personal communications tasks. (C) 1997 Elsevier science B.V.
Advances in directory services, caching and replication, and multicasting technologies promise to improve the speed and robustness of the Web's infrastructure. This article examines the technical issues of two imp...
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Advances in directory services, caching and replication, and multicasting technologies promise to improve the speed and robustness of the Web's infrastructure. This article examines the technical issues of two important approaches - Caching and replication.
In mobile collaborative applications, collaborating agents can move across heterogeneous networks. The collaborating agents also keep changing their roles depending on the work to be performed at that time. I n such s...
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Real-time Fieldbuses are currently a significant issue in both process control and manufacturing areas. They constitute the base upon which real-time fault-tolerant distributedsystems can be designed for these applic...
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ISBN:
(纸本)0818680342;0818680350
Real-time Fieldbuses are currently a significant issue in both process control and manufacturing areas. They constitute the base upon which real-time fault-tolerant distributedsystems can be designed for these application areas. A potential large leap towards the use of Fieldbus in such time-critical applications lies in the evaluation of its temporal behaviour In particular an important problem associated with the Fieldbus FIP is its inability to guarantee the timing performance of sporadic traffic. In this paper we develop the pre-run-time schedulability analysis of FIP, bounding the worst case response time of the sporadic traffic.
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