2,551 research outputs found
Norm Monitoring under Partial Action Observability
In the context of using norms for controlling multi-agent systems, a vitally
important question that has not yet been addressed in the literature is the
development of mechanisms for monitoring norm compliance under partial action
observability. This paper proposes the reconstruction of unobserved actions to
tackle this problem. In particular, we formalise the problem of reconstructing
unobserved actions, and propose an information model and algorithms for
monitoring norms under partial action observability using two different
processes for reconstructing unobserved actions. Our evaluation shows that
reconstructing unobserved actions increases significantly the number of norm
violations and fulfilments detected.Comment: Accepted at the IEEE Transaction on Cybernetic
Intelligent composite layup by the application of low cost tracking and projection technologies
Hand layup is still the dominant forming process for the creation of the widest range of complex geometry and mixed material composite parts. However, this process is still poorly understood and informed, limiting productivity. This paper seeks to address this issue by proposing a novel and low cost system enabling a laminator to be guided in real-time, based on a predetermined instruction set, thus improving the standardisation of produced components. Within this paper the current methodologies are critiqued and future trends are predicted, prior to introducing the required input and outputs, and developing the implemented system. As a demonstrator a U-Shaped component typical of the complex geometry found in many difficult to manufacture composite parts was chosen, and its drapeability assessed by the use of a kinematic drape simulation tool. An experienced laminator's knowledgebase was then used to divide the tool into a finite number of features, with layup conducted by projecting and sequentially highlighting target features while tracking a laminator's hand movements across the ply. The system has been implemented with affordable hardware and demonstrates tangible benefits in comparison to currently employed laser-based systems. It has shown remarkable success to date, with rapid Technology Readiness Level advancement. This is a major stepping stone towards augmenting manual labour, with further benefits including more appropriate automation
Appearance of effective surface conductivity - an experimental and analytic study
Surface conductance measurements on p-type doped germanium show a small but
systematic change to the surface conductivity at different length scales. This
effect is independent of the structure of the surface states. We interpret this
phenomenon as a manifestation of conductivity changes beneath the surface. This
hypothesis is confirmed by an analysis of the classical current flow equation.
We derive an integral formula for calculating of the effective surface
conductivity as a function of the distance from a point source. Furthermore we
derive asymptotic values of the surface conductivity at small and large
distances. The actual surface conductivity can only be sampled close to the
current source. At large distances, the conductivity measured on the surface
corresponds to the bulk value.Comment: 11 pages, 8 figure
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