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In this paper, we study two kinds of three-point boundary value problems for second order differential equations by using a fixed point theorem of general α-concave operators, upper-lower solution method and monotone iterative technique. We present the criteria which guarantee the existence and uniqueness of positive solutions to these differential equations. In the end, we give two examples as applications...
While real-time monitoring the primary users' channel in cognitive radio, most secondary users can't obtain the signal parameters, as for primary user's information security and their own aspirations. In this paper, we proposed to estimate primary user signal parameters by the highest spectral correlation function at the non-zero frequency without any knowledge about primary signal, making use of...
This paper studies the detection of the primary signal under noise uncertainty. A coherent MAC (Multiple Access Control) cooperative sensing scheme is proposed, adopted dual-threshold detection determined by the noise uncertainty range. Using the one-bit hard combine make the cooperative overhead reduce from O(N) to O(1). Simulation shows that the proposed method is superior to the traditional collaborative...
Time delay is a kind of common nonlinearity, which is consisted in many parts of suspension system of high speed maglev train.In this paper, the dynamic behavior of suspension system of maglev train with time-delayed velocity and acceleration feedback signal is considered with rigid guideway. Taking time delay as its bifurcation parameter, the condition with which the Hopf bifurcation may occur is...
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