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A DCT_SVD field watermarking algorithm for digital image based on Moore-model cellular automata scrambling is proposed in this paper. Firstly, Moore-model cellular automata with chaotic characteristics is used to disorder the original mark. Then the original carrier image is carry on 8×8 block discrete cosine transform (DCT), where low frequency coefficients of the carrier image is selected in a Zig-Zag...
Supply chain emergency comes from supply chain risks, and usually interrupts the harmonious operation of supply chain. So it's very necessary to evaluate the dynamic degree of supply chain emergency and then take corresponding measurements to prevent the occurrence of supply chain emergency. This paper tries to set up an evaluation model of supply chain emergency based on unascertained measure and...
The discovery of association rules in data mining is an important issue, the core of which is the frequent pattern mining, Apriori algorithm is classical for the association rule mining, but it should repeatedly scan the database and can produce plenty of candidates. By examples, it is proved that Boolean matrix association rules algorithm can improve the algorithmic efficiency by reducing the times...
This paper deals with the attitude tracking of spacecraft with single-gimbal Variable-Speed Control Moment Gyro-scopes(VSCMGs) as actuator. The quaternion is used to describe the attitude, the attitude error is expressed by rotation matrix from desired attitude to current one. Considering actuator model parameter uncertainties and external disturbances, the spacecraft equations of motion are fully...
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