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The deterministic optimization algorithms far outweigh the non-deterministic ones on unimodal functions. However, classical algorithms, such as gradient descent and Newton's method, are strongly dependent on the quality of the initial guess and easily get trapped into local optima of multimodal functions. On the contrary, non-deterministic optimization methods, such as particle swarm optimization...
This paper presents a likely explanation for dips observed in transmission coefficient measurements (S21) for twisted-pair copper cables. We show via computer simulations that periodic cable nonuniformities behave like selective filters, prohibiting electromagnetic wave to propagate at certain frequencies. Similar effect is achieved in optics using fiber Bragg grating (FBG) and may be analyzed as...
The response of an optical strain sensor based on the fiber Bragg grating is theoretically analyzed with a different approach of that found usually in the literature. In this model, geometrical changes suffered by the grating itself are taken into account. The results are compared with those from experiments, showing very good agreement.
A method to identify some physical parameters of twisted-pair cables is presented in this paper. The parameters identification process is carried out from input impedance measurements, applying analytical approach and mean squared estimation. The obtained results indicate the accuracy and applicability of the proposed method.
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