Peter Wall

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We propose a new system for vision-based mobile robot navigation in an unmodeled environment. Simple , unobtrusive artiicial landmarks are used as navigation and localization aids. The landmark patterns are designed so that they can be reliably detected in real-time in images taken with the robot's camera over a wide range of viewing conngurations. The code(More)
The associative memory function of the brain is an active area of experimental and theoretical research. This thesis describes the construction of a model of cor-tical auto-associative memory. Conceptually, it is based on Hebb's cell assembly hypothesis. The quantitative description comes from a class of artiicial neural networks, ANN, with recurrent(More)
—The increasing development of large-scale offshore wind farms around the world has caused many new technical and economic challenges to emerge. The capital cost of the electrical network that supports a large offshore wind farm constitutes a significant proportion of the total cost of the wind farm. Thus, finding the optimal design of this electrical(More)
This paper deals with the limit behaviour of the solutions of quasi-linear equations of the form − div (a (x, x/ε h , Du h)) = f h on Ω with Dirichlet boundary conditions. The sequence (ε h) tends to 0 and the map a(x, y, ξ) is periodic in y, monotone in ξ and satisfies suitable continuity conditions. It is proved that u h → u weakly in H 1,2 0 (Ω), where u(More)
In future long duration Mars exploration missions, network limitations and the lack of real-time communication capabilities will impact various aspects of space crew performance as well as behavioral health. Studies in ground-based analogs of Isolated and Confined Environments (ICE) such as Antarctica have identified sensory and social monotony as threats(More)
We consider a problem that models fluid flow in a thin domain bounded by two surfaces. One of the surfaces is rough and moving, whereas the other is flat and stationary. The problem involves two small parameters ϵ and μ that describe film thickness and roughness wavelength, respectively. Depending on the ratio λ=ϵ/μ, three different flow regimes are(More)