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In this paper, a solution to the double curl equation with generalized Coulomb gauge is proposed based on the vectorial representation of the magnetic vector potential. Coulomb gauge is applied to remove the null space of the curl operator and hence the uniqueness of the solution is guaranteed. However, as the divergence operator cannot act on the curl-conforming edge basis functions directly, the...
This paper proposes a mathematical model of the three-phase four-switch pulse width modulated (PWM) voltage-source recti??er (VSR) based on direct power control (DPC). The derived model has the advantages of specific physical meaning, more versatile and precise, and most nonlinear control strategies of six-switch VSR could be utilized for four-switch VSR. By analyzing the proposed model, the dynamic...
In this paper, we consider cooperative game with stochastic payoffs and give the definition of the Shapley value for it, which is obtained by extending the classical case. Then we provide explicit expression for the Shapley value of the cooperative game with stochastic payoffs, and discuss its existence and uniqueness. Finally, the properties of the Shapley value of convex cooperative game with stochastic...
Head-related transfer functions (HRTFs) depend on frequencies, sound directions, and individuals with high dimensionality and complicated structure. In practical applications, it is difficult to utilize the original HRTFs. Nonnegative matrix factorization (NMF) has been used to reduce the dimension of original HRTFs by vectorization and might lose the information of their natural structure. In this...
A new strategy of feature classification method for speaker recognition based on the grid-density clustering is presented. According to the concept of density-based and grid-distance-based distribution in the Mel-frequency cepstrum domain, the feature vectors of each speaker were self-adaptively classified into L clusters with less overlapped. With these convex and non-interwoven clusters, the Gaussian...
Matrix optimization of cost functions is a common problem. Construction of methods that enable each row or column to be individually optimized, i.e., decoupled, are desirable for a number of reasons. With proper decoupling, the convergence characteristics such as local stability can be improved. Decoupling can enable density matching in applications such as independent component analysis (ICA). Lastly,...
Gossiping models have been increasingly applied to study social network phenomena, in particular, to model the dynamics of social behavior or belief through local interactions. In this context, this paper investigates how the opinions of social agents diffuse in a network under a so-called hard-interaction model, in which the agents interact more strongly with neighbors that share their beliefs and...
In this paper, an adaptive blind calibration method for timing mismatch in time-interleaved ADCs is proposed. A modified correction structure based on Differentiator Multiplier Cascade is presented for error correction. It enables the application of adaptive blind timing estimation, while the adaptive blind estimation method requires the input signal to have a significantly rich spectrum and be slightly...
In the condition of single training sample, traditional methods get low recognition accuracy, or even can not be used. In view of this situation, this paper proposes a method to slove this problem. Firstly, face image is decomposed by image pyramids. Then, each layer image segmentation into sub images with th same size. After that, the feature of each sub image, which got with (W2DPC)2A, gets a weight...
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