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A novel recursive scheme to compute the global and robust optimal variable fractional delay (VFD) filters based on the Particle Swarm Optimization (PSO) is developed in this paper. If the PSO is directly used to compute an optimal VFD filter the particles with high dimension might be yielded, which could require a long convergence time. Our recursive scheme invokes only the particles with much smaller...
The technology of instant messaging (IM) is becoming an important means of communication nowadays. However, some inherit security weaknesses have been recognized as a serious barrier for IM building up its position as an Internet key application. This paper presents a security design for IM on the basis of comparison between the RSA algorithm and the 3DES algorithm that satisfy the requirements at...
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