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Today economic integration all over the world not only accelerates the development of the international logistics, but also makes the problem of the international logistics risk increasingly prominent. As a result, an increasing number of companies begin to pay more attention to the international logistics risk management, especially the issue of risk assessment. From the characteristics of the international...
In order to improve the scheduling efficiency of IEEE 802.16 mesh mode, exactly theoretical analysis is necessary. In the IEEE 802.16 mesh mode with distributed coordinated scheduling, all nodes are peers and multi-hop communication is allowed. Every node has to compete for transmission opportunities based on scheduling information in the two-hop neighborhood. In this paper, we use probability-based...
A new genetic algorithm, combined cultivating with migrating operators (CMGA), is proposed. Cultivating operator can make gene segments of chromosomes keep superior characteristics at a higher probability. A new migrating schema with directed direction guided by illumination information is discussed, and it can overcome the blindness and invalidity in genetic operations. We focus on key factors of...
The distributed relay selection protocol recently developed by Bletsas et. al. provides a simple and practical mean of achieving cooperative diversity. However, for cooperative networks where relays employ the decode-and- forward (DF) method to send information, it cannot achieve full diversity unless each relay knows whether it decodes correctly or not. Moreover, the criterion used to select the...
The Dirichlet distribution is applied to extract the multi-target states in the sequential Monte Carlo implementation of probability hypothesis density filter in this paper. The character of Dirichlet distribution with negative exponent parameters, on which this paper is mainly concentrated, is that it makes the components unstable and competitive with each other so that components with less evidence...
The impact of noise AM jamming on starting probability of pseudo-random binary-phase-coded fuze (PRBPCF) is researched in this paper. Analysis model of the starting probability is set up, and the starting probability of the PRBPCF is deduced under noise AM jamming. Factors influencing the starting probability are discussed. The simulation results show that the starting probability is affected not...
The increase in negative effects of fossil fuels on the environment has forced many countries to use renewable energy sources, especially wind energy. China is a country which conceals abundant wind energy resources but the utilization of wind energy is limited. In this paper, our objective is to assess wind potential in Fujian Province by selecting two cities, Fuzhou and Shamen, both of which is...
In this paper, an estimation algorithm of channel state transition probabilities in Markov channel model for cognitive radio systems is proposed. The framework of POMDP is adopted to solve the problem of channel selection. Maximum likelihood method is used to estimate the channel state transition probabilities, which is crucial to POMDP. Central Limit Theorem is introduced to get the relationship...
The contrast of the underwater images is often extraordinarily low due to the ray, assimilating of water, illuminating condition and so on. It is not good for the pretreatment like edge detection and image segmentation. The theory of entropy has been widely used in the pre-process of under water images. However the time-consuming computation is often an obstacle in real time application systems. In...
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