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An improved image encryption algorithm based on chaotic logistic map is designed. First, after two initial values of Logistic chaotic map are pretreated, two of the modified initial values are obtained, according to which two chaotic sequences are generated. Next, two chaotic sequences are operated by cos-1 function. Last, image is encrypted combining the method of the gray value substituting. Results...
Bayesian network is an uncertainty inference network based on probability. Its structure learning is one of the main research techniques in the field of data mining and knowledge discovering, while constructing Bayesian network structures from data is NP hard. According to the information theory and conditional independence test, a new algorithm is presented for the construction of optimal Bayesian...
Particle Swarm Optimizer (PSO) suffers a problem which gets used to trap into a sub-optimal solution, especially in Constrained Optimization (CO). On the other hand, it's difficult to converge to a feasible domain for some constrained optimization problems. The paper proposes a two-stage probing method to improve PSO method. The first stage guarantees the particle to get away from feasible region...
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