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Narrow-band disturbances will generate vibrations at multiple frequencies and cause significant performance degradation in modern high precision control systems. This paper proposes an adaptive frequency-shaped sliding mode control (AFSSMC) algorithm to deal with such disturbances. The proposed AFSSMC incorporates a peak filter with varying central frequencies to shape the sliding surface and thus...
The extended state observer (ESO), as a special case of high-gain observers, can estimate not only the state variables but also unknown disturbances. ESO works well for slowly time-varying/low-frequency disturbances. To extend its performance to high-frequency disturbances, this paper proposes a phase compensator to recover the inherent phase loss in the traditional ESO. Furthermore, the ESO gains...
With the development and maturity of cloud computing technology, the demand for cloud storage is growing. Deduplication is a basic requirement for cloud storage to save storage space of cloud servers. And as clients are untrusted from the perspective of the server, the notion of Proofs of Ownership (PoWs) has been proposed in client-side deduplication. On the other hand, the clients cannot completely...
According to the MOV reduction theory, the identity-based encryption (IBE) scheme basing on the bilinear map will lose the high efficiency of elliptic curve. So it is meaningful to build the provably secure identity-based encryption scheme, but which is without the bilinear map. In this paper, based on this existing result and our new research, an improved IBE scheme will be proposed. But it is different...
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