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Aim to improve the convergence of the adaptive filtering, based on the multi-step gradient method, a new affine projection algorithm with direction error is presented. The statistical behavior of the proposed algorithm is analyzed. The deterministic recursive equations for the weight error and for the Mean-square error (MSE) are derived in the weight update direction of the adaptive filtering. The...
Providing a safe computing condition to unknown user is a crucial task in the existing network computing, and usually we can use the sandbox technology to shield security issues, but the behavior of malicious-occupying the resource has not been well controlled in the sandbox. In this passage, permission rate to access the computational efficiency and accuracy can be available by improving the Linux...
Take advantage of the feature that the energy of the image would gather and spread on four components in the subimage after first-order GHM multi-wavelet transform. Propose an information hiding algorithm based on modifying the direction of color mod vector structure (CMVS) of four GHM first-order sub-images (LL2, LH2, HL2 and HH2). The direction of CMVS represents the information. The maximum change...
As the heterogeneity of Web clients increasing, the differentiated service becomes an important issue for e-commerce Web sites, and the control theory has already been used for this in Web server. However, when workloads vary significantly, the real-time performance of feedback control needs to be improved. After analyzing the heavy-tailed property of embedded files in Web pages, this paper presents...
Take advantage of the feature that the energy distribution ratio is approximately 4.5:2.2:2.2:1.1 in the four LL1 sub-images (LL2, LH2, HL2 and HH2) after first-order GHM multi-wavelet transform. Use the feather of image bit plane embedded strategy. Propose an information hiding scheme based on GHM and combination bit plane (CBP). LL2 is embedded module of robust parameters. Embed hiding Information...
As an application of mobile ad hoc networks in transportation realm, Vehicular Ad hoc Network (VANET) is a prominent technology for inter-vehicle communications in Intelligent Transportation System. City environment is a main scenario for VANET applications, and routing for urban VANET faces greater challenges because of potential more uneven distribution of vehicular nodes, constrained mobility pattern...
AODV routing protocol is widely used in mobile ad hoc networks, but it does not have any security mechanism, so it is very vulnerable to security attacks. This paper analyses the common threats of AODV and then a security improvement is carried out. By setting up blackholes and rushing attack models, the performance of improved protocol is simulated using QualNet simulation tools. The results show...
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