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In this paper we exploit the space mapping optimization technique [1] to design dielectric resonator filters. The coarse model is a network model consisting of a coupling matrix and input/output transmission lines. The fine model is simulated by Ansoft HFSS. The idea is to establish a mapping between the filter design parameters and the coupling elements. This mapping is approximated by a linear relation...
This paper presents a graph-based model of periodic migrations of tagged fish populations and two multi-AUV stochastic controllers developed to track these fish from the model. The model presented in this paper characterizes patterns in the historical movement of tagged fish and is used to develop stochastic tracking by a “model based control” and a “feedback control”. These two controllers permit...
This paper is devoted to finding out the most influential qualitative and quantitative factors affecting compact range construction with properly chosen radiators and reflector antennae. The results were obtained utilizing the Analytical Regularization Method. It reduces the problem to an infinite system of linear algebraic equations of the second kind that guarantees a mathematically rigorous and...
Background Food tax-subsidy policies are proposed to hold promise for helping to produce healthier patterns of food purchasing and consumption at population level. Evidence for their effects derives largely from simulation studies that explore the potential effects of untried policies using a mathematical modelling framework. This paper provides a critique first of the nature of the evidence derived...
The present paper describes a device structure for controlling and measuring strain in graphene membranes. We propose to induce strain by creating a pressure difference between the inside and the outside of a cavity covered with a graphene membrane. The combination of tight-binding calculations and a COMSOL model predicts strain induced band gaps in graphene for certain conditions and provides a guideline...
A technique is presented that will determine an efficient set of transmitters in a MIMO radar event based on tracking accuracy and energy consumption. The posterior Cramér-Rao lower bound (PCRLB) will provide the means of determining these optimal transmitters by placing a bound on the variance of the track state estimate. This is a predictive PCRLB since it is calculated before any measurements...
In earlier work [1,2] the potential for detecting and tracking a target using maximal length sequences with block zeroing was demonstrated via theory and simulation. In an initial application of this work, a -20 dB acoustic target was detected and tracked at a source-target distance of approximately 170 m in water 2 m deep. Using the sonar equation, the detection performance of a maximal length sequence,...
The response of aperture-backed cavities and other highly resonant scatterers can pose difficulties for general purpose computational codes, in both time- and frequency-domain. An accurate, numerically efficient frequency domain solution is developed for the scalar wave diffraction problem from an arbitrary shaped body of revolution, either closed or having an aperture. The Dirichlet boundary condition...
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