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As a new type of pattern recognition method, the immune clustering algorithm is successfully applied to deal with analog circuit fault diagnosis problem. Firstly, exact the fault characteristics of the circuit based on principal component analysis method. Then, calculate the clustering center as the antibody of each circuit status based on clone selection algorithm, which is so-called immunological...
The multiscale FEM is used to analysis the problem that wave propagates in a period media. The equation of EM wave for multisacle FEM is deduced. The two dimensional wave propagation problem is solved. The computed results are compared with results which are computed by conventional FEM. The two result agree with well.
In this paper we investigate the scattering and propagation characteristics of a Gaussian beam impinging upon a dielectric slab with holes, referred to herein as a “holey plate”, which is designed to have a Double negative (DNG) behavior. Our simulation results indicate that the direction of propagation of the Gaussian beam is dependent upon the waist of the beam, and does not exactly follow the negative...
In this paper we present a Fabry-Perot type of design, involving a microstrip array covered by a 14??0 ?? 14??0 superstrate that realizes a directivity of 32 dB when excited by an array of 25 microstrip patches. We show that the directivity of the array can be enhanced by an additional 2 dB by using a two-layer superstrate. We present the radiation patterns for the two cases to show that the sidelobe...
In this paper we present a novel design for a low-profile Fabry-Perot (FP) cavity type antenna, which achieves a high directivity combined with an excellent aperture efficiency. Unlike similar FP cavity-type antennas, that are excited with either a dipole or a microstrip patch antenna (MPA), the proposed approach utilizes a slot feed, which not only is easier to fabricate than the presently available...
The method extracting permeability from scattering coefficients was studied in this paper. The support vector machine (SVM) method is used to solve the inverse problem of parameters extraction. The mapping relationship is set up by calculating a large number of S parameters from the samples with different permeability by using transmission line theory. The simulated data set is used as training data...
Relevance feedback is one of the techniques applied in a vector-space-modeled information retrieval system to enhance retrieval effectiveness. The feedback process usually has the user rate the documents retrieved as relevant or non-relevant. Most past studies apply the information of document relevance to the modification of the vector that is used to manifest the user's information interest. In...
Low reflection material is very useful in many applications. At present, the operation frequency in the most absorbing materials are above 4 GHz, for it is difficult to realize the low reflection below 4 GHz with thin structure. A thin structure material that realize the low reflection was studied by using the analog circuit method in this issue. A genetic algorithm is used to find the optimization...
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