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In cognitive radio (CR) networks, the cooperative spectrum sensing can greatly improve the sensing performance. However, several existing cooperative spectrum sensing methods have time asynchronization assumption, which will inevitably bring the waste of waiting time, and will cause many limitations in the practical application. In this paper, we propose an enhanced asynchronous cooperative spectrum...
This article focuses on the experimental study of the microwave desulfurization of coal. The subject has taken three methods, that is microwave radiation-acid washing desulfurization, microwave radiation-caustic soda desulfurization, microwave radiation-mixture of hydrogen peroxide and acetic acid desulfurization, to test the effects of the length of microwave -radiating time and the volume ratio...
We propose a system to embed watermark message into audio signal, which can be used for copyright protection. It uses spread spectrum theory to generate a watermark that resistants to different removal attempts. We exploit the psychoacoustic auditory model to guarantee the audio signal's perceptual quality after the watermark embedding procedure. Recovery is performed without knowledge of the original...
In this paper, we propose a mathematical framework to maximize the user throughput in a wireless channel using various parameters such the symbol rate, the packet length, and the constellation size as optimization variables. The optimization equations with each of the above degrees of freedom have been presented. We see a gain in choosing the parameters using a theoretical framework. We also present...
The paper deals with the principle of one-parameter plane family envelope for designing developable surface. It meets the common requirements of engineering fields. Then the paper presents the digital method of development for designed developable surface based on the principle of intrinsic geometry. It gives mathematical model of development through discretization of developable surface and digital...
This paper studies the vibration control of jacket-type offshore platforms. A feedforward and feedback optimal controller (FFOC) is developed. The FFOC is proved to be existent and unique. In the design of FFOC, we consider the irregular wave and current forces, and the displacement and velocity of structure. The feasibility and effectiveness of the presented control law is demonstrated by a numerical...
In the circumstances that evidences are highly or full conflict, D-S evidence combination method may lose effectiveness, for this reason some improved methods of evidence combination are given in succession. Some scholars think, different evidence source is under different circumstance, so the importance of each evidence source is different. In the conditions that evidences are highly or full conflict,...
Feedforward active noise control (ANC) system requires a coherent reference signal. However, in many real-life applications, this reference signal may be unavailable. Feedback ANC systems are promising for such cases. So far, to the best of our knowledge, stochastic analysis of feedback ANC systems has not appeared, and our work is expected to fill in this gap. In this paper, dynamics of a feedback...
A well-known result in Bayesian inventory control is: if lost sales are not observed, the optimal Bayesian inventory level is no less than the corresponding myopic case, that is, the decision-maker should “stock more” to acquire the knowledge of demand. However, we find that when the stockout demand can be satisfied by some substitute product with a probability, the optimal Bayesian inventory level...
By variational method, this paper studies a dynamic pricing problem of perishable products when facing rational consumers. The seller dynamically sets the price for the perishable products to maximize its total profit and the rational consumers choose their consumption pattern to maximize the expected surplus. We present a game theoretic model based on their rational expectations and develop a rational...
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