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Helem Sabina Sánchez Damiano Rotondo Teresa Escobet Vicenç Puig Jordi Saludes Joseba Quevedo 《Journal of The Franklin Institute》2019,356(5):2798-2824
This paper proposes a frequency-based approach for the detection of replay attacks affecting cyber-physical systems (CPS). In particular, the method employs a sinusoidal signal with a time-varying frequency (authentication signal) into the closed-loop system and checks whether the time profile of the frequency components in the output signal are compatible with the authentication signal or not. In order to carry out this target, the couplings between inputs and outputs are eliminated using a dynamic decoupling technique based on vector fitting. In this way, a signature introduced on a specific input channel will affect only the output that is selected to be associated with that input, which is a property that can be exploited to determine which channels are being affected. A bank of band-pass filters is used to generate signals whose energies can be compared to reconstruct an estimation of the time-varying frequency profile. By matching the known frequency profile with its estimation, the detector can provide the information about whether a replay attack is being carried out or not. The design of the signal generator and the detector are thoroughly discussed, and an example based on a quadruple-tank process is used to show the application and effectiveness of the proposed method. 相似文献
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This paper proposes a gain-scheduling approach for systems with a quadratic structure. Both the stability analysis and the state-feedback controller design problems are considered for quadratic parameter varying (QPV) systems. The developed approach assesses/enforces the belonging of a polytopic region of the state space to the region of attraction of the origin, and relies on a linear matrix inequality (LMI) feasibility problem. The main characteristics of the proposed approach are illustrated by means of examples, which confirm the validity of the theoretical results. 相似文献
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杨凡 《大学图书情报学刊》2012,30(6):42-45
针对现代图书馆采购环境的变化及图书采访方式存在的多种问题,文章提出以联合采购中心（UPC）为核心的联合招标采购体系新模式,并阐述了该模式在使用过程中要注意的事项和实施过程,展望了以联合采购中心（UPC）为核心的联合招标采购体系新模式使用的未来前景,探讨了该模式对图书馆文献采购可持续发展所具有的重要意义。 相似文献
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