Desktop Computing Grids provide a framework for joining in and sharing resources with others. The result is a self-organised system that typically consists of numerous distributed autonomous entities. Openness and het...
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ISBN:
(纸本)9789897581496
Desktop Computing Grids provide a framework for joining in and sharing resources with others. The result is a self-organised system that typically consists of numerous distributed autonomous entities. Openness and heterogeneity postulate severe challenges to the overall system's stability and efficiency since uncooperative and even malicious participants are free to join. In this paper, we present a concept for identifying agents with exploitation strategies that works on a system-wide analysis of trust and work relationships. Afterwards, we introduce a system-wide controlloop to isolate these malicious elements using a norm-based approach due to the agents' autonomy, we have to build on indirect control actions. Within simulations of a Desktop Computing Grid scenario, we show that the intelligent controlloop works highly successful: these malicious elements are identified and isolated with a low error rate. We further demonstrate that the approach results in a significant increase of utility for all participating benevolent agents.
The problem of designing a self-adaptive system (SAS) is often approached from the perspective of adding an adaptive control loop to a technology or system that is not explicitly adaptive on its own. Although the cont...
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ISBN:
(数字)9781665451420
ISBN:
(纸本)9781665451420
The problem of designing a self-adaptive system (SAS) is often approached from the perspective of adding an adaptive control loop to a technology or system that is not explicitly adaptive on its own. Although the controlloop is a separate component, its design must be compatible with the features of the base system. In practice, the two designs can be interdependent. The objective of this paper is to define a set of design questions that can be used to pinpoint important attributes in a base system in terms of how it constrains or enables adaptation capabilities and influences the design of an adaptive control loop. To allow for meaningful analysis across a variety of problem domains, the design questions are specific but require open-ended, qualitative responses. Examples are given of how these design questions can be used to analyze technologies that have appeared in SAS literature.
The increasing coupling of former isolated systems towards an interwoven complex structure poses questions about the controllability and maintainability of the corresponding systems. This paper discusses challenges re...
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ISBN:
(纸本)9789897581496
The increasing coupling of former isolated systems towards an interwoven complex structure poses questions about the controllability and maintainability of the corresponding systems. This paper discusses challenges resulting from the growing complexity of technical systems and derives solution perspectives by utilising concepts from the domain of self-organising and self-optimising systems, in particular from the Organic Computing and Autonomic Computing initiatives.
A frequency-domain equalizer with a mixed-signal adaptive control loop and a novel baseline wander （BLW） canceller are proposed. The equalizer is independent of channel-modeling accuracy,and its controlloop is intr...
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A frequency-domain equalizer with a mixed-signal adaptive control loop and a novel baseline wander （BLW） canceller are proposed. The equalizer is independent of channel-modeling accuracy,and its controlloop is intrinsically stable. An AGC function is incorporated into the equalizer without an extra AGC circuit. The proposed BLW canceller uses a peak detector to monitor the BLW and full feedback method to accomplish BLW canceling. High canceling accuracy and robust performance are achieved. The circuits are tested in 0.25μm CMOS technology. Better performance and smaller silicon area are achieved compared with results in the literature.
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