Smart Packets is a DARPA-funded Active networks project focusing on applying active networks technology to network management and monitoring without placing undue burden on the nodes in the network. Messages in active...
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Smart Packets is a DARPA-funded Active networks project focusing on applying active networks technology to network management and monitoring without placing undue burden on the nodes in the network. Messages in active networks are programs that are executed at nodes on the path to one or more target hosts. Smart Packets programs are written in a tightly-encoded, safe language specifically designed to support network management and avoid dangerous constructs and accesses. Smart Packets improves the management of large complex networks by (1) moving management decision points closer to the node being managed, (2) targeting specific aspects of the node for information rather than exhaustive collection via polling, and (3) abstracting the management concepts to language constructs, allowing nimble network control. This paper introduces Smart Packets and describes the Smart Packet architecture, the packet formats, the language and its design goals, and security considerations.
Most robot software architectures focus on the problem of imitating human intelligence and thus typically refer to a single robot perceiving, navigating and acting in the environment. However, the rapid process of com...
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Most robot software architectures focus on the problem of imitating human intelligence and thus typically refer to a single robot perceiving, navigating and acting in the environment. However, the rapid process of communication technology has modified this reference scenario, offering the possibility of `distributing' the intelligent activity on a network of robots, computers and other general sensing and actuating devices. This allows the robot to merge with the environment it operates in and, moreover, different robots may co-operate as a single entity in order to carry out a specific task more efficiently. This paper tackles this `extended' problem, presenting ETHNOS-II, a programming environment for the design of a system composed of different robots integrated with the environment they operate in. ETHNOS-II provides support from two main point of views: from the software engineering perspective it provides support for platform independence, software integration and re-use, computation distribution;from the runtime perspective it provides support for real-time execution and event handling, inter-robot communication, and intra-robot resource allocation.
The deployment of advanced network services such as virtual reality games, distributed simulation, and video conferencing, will require sophisticated resource management support. The reason is that the quality of the ...
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The deployment of advanced network services such as virtual reality games, distributed simulation, and video conferencing, will require sophisticated resource management support. The reason is that the quality of the delivered service will depend both on what resources are allocated to the user, and how these resources are managed at runtime. This problem is challenging because the definition of Quality of Service (QoS) is in general user specific, so hardwired resource management mechanisms will not be sufficient. To address the runtime resource management problem, we introduce the concept of a delegate, a code segment that applications or service providers inject into the network to assist in the management of the network resources that are allocated to them. This approach allows users to tailor runtime resource management to best meet their specific needs. Moreover, since delegates execute inside the network, they can easily collect information on changing network conditions, and can quickly adapt the resource allocations for the flows they are responsible for. Delegates have been implemented in the CMU Darwin system, which provides an integrated set of customizable resource management mechanisms in support of sophisticated network services. In this paper we present the design of the delegate runtime system, focusing on the programming interface that delegates use to monitor the network and modify resource use. We describe how delegates are supported in Darwin, and we show how delegates can be used to deal with a number of problems such as congestion control for video streaming, tracking down non-adaptive sources, and balancing traffic load.
As a contribution to increasing the range of ideas on architecture and process for incorporation in ANNs a new theory is outlined of the emergence of parcellation of the cerebral cortex on an evolutionary time scale. ...
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ISBN:
(纸本)3540660690
As a contribution to increasing the range of ideas on architecture and process for incorporation in ANNs a new theory is outlined of the emergence of parcellation of the cerebral cortex on an evolutionary time scale. Slow learning and accelerated evolution, involving a form of inheritance of acquired characteristics, are assigned fundamental roles in the creation of functionally tilted, local cortical area architectures. Within each generation a cycle of neuron --> astrocyte --> neuron interaction produces a web of associated astrocytes defining local neural areas consistently engaging in integrated subsymbolic processing. Effects of intra-generational experience enter the perm line via processes involving astrocytes, epithelial cells, lymphocytes and RNA retroviruses. Potential application of the theory is explored in evolutionary programming aimed at constructing a generalisable, recurrent network induction algorithm.
This paper concerns the critical role of separable user interface design in teaching object-oriented systems. M206 ÒComputing: An Object-oriented ApproachÓ is a large-scale university-level introduction to s...
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open systems are being presented as the way forward for the construction of complex computer based systems of all types. They have had some success but as with all such attempts to solve problems in computing, it is b...
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open systems are being presented as the way forward for the construction of complex computer based systems of all types. They have had some success but as with all such attempts to solve problems in computing, it is being touted as a panacea. Before the success is lost in disgruntled disappointment, this reflection attempts to establish awareness of pitfalls which may save the open systems idea from going the way of all panaceas. This paper further suggests that open systems are only, the first step towards safe and reliable computing platforms for the future, and recommends an evolutionary path which includes such concepts as stable infrastructure architectures, domain and application openness and open systems engineering.
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.
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