Optimal ϵ -stealthy attack in cyber-physical systems     

Weiwei Tu  Jiuxiang Dong  Ding Zhai 《Journal of The Franklin Institute》2021,358(1):151-171

This paper is concerned with the optimal stealthy attack problems of cyber-physical system, which is represented as discrete-time linear systems. It is considered that a deceptive attack assumed to be able to hijack and modify the nominal control signals from the controller-actuator channel with the metric of ? -stealthiness. Different from the existing literatures, some optimal attack strategies with objectives such that maintaining a fixed level of stealthiness and achieving the maximized performance degradation are designed under some constraints. It is further derived that the results of ours are more relaxed than some methods proposed before. Finally, some numerical simulations are given to illustrate the validity of the theoretical results.  相似文献   

重庆第三产业R&D投入产出效应的实证研究          下载免费PDF全文

曾国平  苏宏  曹跃群 《科研管理》2011,32(7):1

本文构建了二级三要素CES生产函数,把要素投入分为R&D投入与非R&D投入两个部分,计算了重庆第三产业五个主要行业的R&D投入与非R&D投入的替代弹性和产出弹性。研究发现这些行业目前都处于规模报酬递增阶段,人力投入与资本投入之间的替代弹性平均约为1,R&D资本投入替代弹性比R&D人力投入替代弹性小,非R&D投入的产出弹性高于R&D投入的产出弹性。最后根据研究结论提出了对策建议。  相似文献   

山寨产业生产方式及其易发领域探析   总被引：2，自引：0，他引：2  

刘字濠  曾国屏 《科技管理研究》2011,31(24)

从生产方式的视角,以山寨手机等常见的消费类通讯或电子产业为主要研究对象,对其进行剖析,进而探讨山寨产业可能的易发领域.  相似文献   

珠三角产业转移中的创新型人才培养模式研究     

魏国平  邓彦  李华军 《科技管理研究》2011,31(6)

产业转移,本质上是现有生产力在空间布局上的调整,其中人力资本对产业转移成功与否起到关键的作用.在珠三角产业转移的背景下,站在地方高校视角探讨产业转移需要的创新型人才培养模式,从分析创新性人才的必要性、产业转移与人力资本的内在机理出发,提出珠三角产业转移中创新型人才培养的相关对策.  相似文献   

浅谈云计算及其发展现状     

涂小强  陈海莲 《科技广场》2011,(3)

云计算是基于多种技术的商业计算模型,将是21世纪的一种发展趋势,本文主要介绍了云计算的概念、特点、实现机制、提供的服务以及目前国内外的研究发展现状。  相似文献   

分形在GIS中的应用及其研究意义   总被引：1，自引：0，他引：1  

吴国平 《科技广场》2011,(9):136-138

基于分形几何学描述复杂事物和现象的天生优势,本文探讨其在GIS领域中,地图目标结构特征、DEM内插和制图综合中的应用及其研究意义,在此基础上给出了在以后的研究中进一步需要解决的问题,即GIS中地理现象的空间格局、形成演化过程、影响因素、发展机制和调控机理等。  相似文献   

Electrophoretic separation of neurotransmitters on a polystyrene nano-sphere∕polystyrene sulphonate coated poly(dimethylsiloxane) microchannel     

Zhao J  Zhang Q  Yang H  Tu Y 《Biomicrofluidics》2011,5(3):34104-341049

In this paper, a poly(dimethylsiloxane) microchip with amperometric detector was developed for the electrophoretic separation and determination of neurotransmitters. For increasing the separation efficiency, the microchannel is modified by polystyrene sulphonate∕polystyrene nano-sphere self-assembly coating. A stable electro-osmotic flow (EOF) and higher separation efficiency are obtained in proposed modified microchannel. Under optimized conditions, dopamine, epinephrine, catechol, and serotonin are acceptably baseline separated in this 3.5 cm length separation channel with the theoretical plate number from 4.6?×?10(4) to 2.1?×?10(5) per meter and resolution from 1.29 to 12.5. The practicability of proposed microchip is validated by the recovery test with cerebrospinal fluid as real sample which resulted from 91.7% to 106.5%.  相似文献   

Electrophoretic separation of neurotransmitters on a polystyrene nano-sphere�Mpolystyrene sulphonate coated poly(dimethylsiloxane) microchannel     

Jinjin Zhao  Qianli Zhang  Huijuan Yang  Yifeng Tu 《Biomicrofluidics》2011,5(3):034104-034104-9

In this paper, a poly(dimethylsiloxane) microchip with amperometric detector was developed for the electrophoretic separation and determination of neurotransmitters. For increasing the separation efficiency, the microchannel is modified by polystyrene sulphonate∕polystyrene nano-sphere self-assembly coating. A stable electro-osmotic flow (EOF) and higher separation efficiency are obtained in proposed modified microchannel. Under optimized conditions, dopamine, epinephrine, catechol, and serotonin are acceptably baseline separated in this 3.5 cm length separation channel with the theoretical plate number from 4.6 × 10⁴ to 2.1 × 10⁵ per meter and resolution from 1.29 to 12.5. The practicability of proposed microchip is validated by the recovery test with cerebrospinal fluid as real sample which resulted from 91.7% to 106.5%.  相似文献   

Beijing's West District Library Enhances International Cooperation     

Xi Tu 《中外文化交流(英文版)》2011,(10):46-47

<正>The West District Library of Beijing is China’s first county/district-level public library granted with the member status of the International Federation of ...  相似文献   

不同油莎豆品系块茎形成规律的比较研究     

杨鹭生  李国平 《南平师专学报》2014,(5)

为揭示油莎豆块茎的形成规律,采用自然种植、定期采样观察等方法对三种不同油莎豆品系块茎的形成过程进行详细观测,结果表明：这三种油莎豆的分蘖数、匍匐茎形成时间、匍匐茎长度及直径、块茎开始膨大形成时间、每株形成块茎数量、块茎大小及形态、块茎在土壤中分布格局等性状存在显著差异,说明不同品系油莎豆的块茎形成特性不同,可为油莎豆的栽培和开发利用提供参考。  相似文献