Compactness, modularity, programming or learning capability, energy efficiency, and robustness are key features needed in next-generation optoelectronic signal processors. Then and only then will these processors make...
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Compactness, modularity, programming or learning capability, energy efficiency, and robustness are key features needed in next-generation optoelectronic signal processors. Then and only then will these processors make a commercial impact. Neural networkarchitectures have been given the most attention thus far, so the focus here will be mainly on this family of processors. Advances in the development of next-generation optoelectronic signal processors will continue to be stimulated by the on-going commercial revolution in high-resolution microdisplays and GaAs integrated-circuit technologies. To achieve the desired compactness, the next-generation systems will most likely have to employ light detection, electronic processing and light generation on the same chip. architectures requiring off-chip sources are not recommended, as these generally require the use of beam splitters, and so are never optimal in terms of compactness and modularity. The purpose here is to encourage development of: (a) cascadable, optoelectronic integrated-circuit arrays (smart-pixels) that employ light detection, electronic processing and light emission on the same chip, (b) compatible, reconfigurable optical interconnection devices, and (c) integration of these elements into compact, modular signal-processing systems.
Large network systems elevate the levels of efficiency and effectiveness of organisations by improving systems integration. This improved integration of computer networks and information systems is accompanied by incr...
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Large network systems elevate the levels of efficiency and effectiveness of organisations by improving systems integration. This improved integration of computer networks and information systems is accompanied by increased risks of intrusion and compromise. Survivability of networks and information systems in face of these risks becomes an important aspect in the effective functioning of an organisation. The unbounded nature of today's networks and the Internet make it impossible to foresee all possible risks and cover the systems against all possible attacks. In this scenario, it becomes necessary that the network be designed to resist possible attacks, recognise attacks and recover from attacks. The open ended nature of this problem requires that flexible architectures be employed to improve survivability. Agent technology is a highly flexible and robust paradigm for building large scale distributed systems. We present an agent based framework for Survivable network Systems.
This paper focuses on dimensioning resilient, hierarchical, dual-homing, multi-ring architectures with or without wavelength converters. A novel dimensioning approach is presented to distribute traffic load between in...
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This paper focuses on dimensioning resilient, hierarchical, dual-homing, multi-ring architectures with or without wavelength converters. A novel dimensioning approach is presented to distribute traffic load between individual rings with the use of appropriate cutset-based analytical lower bounds. Evaluation of the proposed methods is facilitated by equivalent integer linear programming formulations tailored to multi-ring networks. Results obtained for structures adopting different interconnection schemes reveal that topology is a critical factor for both wavelength and hardware requirements.
MV distribution networks constitute the backbone of power distribution systems and for this reason utilities justifiably strive to improve their performance. In the paper heuristic algorithms and methodologies for the...
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MV distribution networks constitute the backbone of power distribution systems and for this reason utilities justifiably strive to improve their performance. In the paper heuristic algorithms and methodologies for the optimal planning of MV networks are proposed and implemented in an efficient software package. By using the above mentioned methodology it is possible to solve the problem of the optimal MV distribution network planning by realising "open loop network" structures which permit improving service quality.
There are a large number of major military modernization initiatives in place to employ a digitized, network-centric, information-dominant fighting force in the next century. The evolution of both military and commerc...
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There are a large number of major military modernization initiatives in place to employ a digitized, network-centric, information-dominant fighting force in the next century. The evolution of both military and commercial information systems from platform-centric to network-centric architectures necessitates the creation of cross-platform environments for development and deployment of network-centric applications using open and industry accepted standards seamlessly across a wide range of connectivity infrastructures. To respond to this need, we have designed and established a state-of-the-art environment and associated testbeds for research, design, development, prototyping, demonstration, integration, and deployment of economical and robust dual-use military and commercial system solutions in the areas of networking and network-centric information technologies. The technical infrastructure of this environment and its various laboratories and testbeds are based on open and industry accepted standards, utilizing commercial-off-the-shelf (COTS) hardware and software components, and are consistent with the Joint Technical Architecture (JTA) and Defense Information Infrastructure (DII) architecture. The enabling technologies and applications currently being researched and investigated in this environment include such domains as advanced networking, wireless connectivity, mobile and nomadic computing, real-time multimedia communications, information security, network-centric computing, Internet technologies and electronic commerce. We describe the underlying architecture, the embedded technologies, and the capabilities of this environment.
The proceedings contain 10 papers. The topics discussed include: a distributed object architecture for QoS-sensitive networking;a comparative study of connection setup on a concurrent connection management platform;As...
ISBN:
(纸本)0780347838
The proceedings contain 10 papers. The topics discussed include: a distributed object architecture for QoS-sensitive networking;a comparative study of connection setup on a concurrent connection management platform;AsyMOS- an asymmetric multiprocessor operating system;signalling in a component based world;TINA service session control supporting complex negotiation;opening network services for management;open mobility management platform for directory-based architecture and signalling protocols;protocol organs: modularity should reflect function, not timing;a reactive implementation of the Tau protocol composition mechanism;ANTS: a toolkit for building and dynamically deploying network protocols;and implementation of a prototype active network.
This paper proposes a functional architecture for protocol systems, as opposed to the conventional temporally layered one. Each block of information to be communicated is operated on by several organs, e.g. for routin...
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ISBN:
(纸本)0780347838
This paper proposes a functional architecture for protocol systems, as opposed to the conventional temporally layered one. Each block of information to be communicated is operated on by several organs, e.g. for routing, integrity and flow control. The architecture retains a skeleton protocol stack to determine the sequence of these operations. However, unlike conventional stacks, the operators themselves are separate from the layers of the stack This functional architecture eliminates several shortcomings that plague layered systems. The architecture provides a path along which current systems can evolve to provide the performance and economy that will be required in the future.
The introduction of user and terminal mobility into private communication networks requires the provision of mobility management services. They handle the dynamic locations of mobile users and terminals and maintain t...
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ISBN:
(纸本)0780347838
The introduction of user and terminal mobility into private communication networks requires the provision of mobility management services. They handle the dynamic locations of mobile users and terminals and maintain the allocation of personal service profiles. We are developing an open mobility management platform that contains a set of support functions and APIs on which mobility management services can be easily built. The platform performs location and profile handling based on distributed X.500 directory services and implements the required nobility management signalling protocols based on X.500 and LDAP directory access protocols. Additionally the platform offers three mobility abstraction levels that we use to build mobile and location-aware multimedia applications. We developed a multi-master replication protocol for the directory servers inside the platform to fulfil the demanding performance and availability requirements of corporate networks. The mobility management services built on this platform can be easily customised to changing and evolving requirements and the platform functionality can be extended due to the generic directory service approach.
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