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预设性能控制的脆弱性问题探究 被引量:2
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作者 卜祥伟 姜宝续 《空军工程大学学报》 CSCD 北大核心 2022年第4期5-13,共9页
基于对现有预设性能控制理论的脆弱性缺陷分析,提出了非脆弱PPC新理论的基本构想。首先,简要概述了PPC的基本框架与关键技术;然后,系统分析了现有PPC当系统遭遇执行器饱和、受扰等问题时可能导致的控制奇异问题,并指出了现有PPC的脆弱... 基于对现有预设性能控制理论的脆弱性缺陷分析,提出了非脆弱PPC新理论的基本构想。首先,简要概述了PPC的基本框架与关键技术;然后,系统分析了现有PPC当系统遭遇执行器饱和、受扰等问题时可能导致的控制奇异问题,并指出了现有PPC的脆弱性缺陷;接着,给出了非脆弱PPC新理论的主要设想以及需要解决的3个基础性问题,即误差感知、包络调整与预设可达;最后,基于非脆弱PPC的技术构想,对现有PPC方法进行改进,给出了可行的非脆弱PPC技术方案,并通过数值对比仿真验证了所提方案的优越性。相关结果有望弥补PPC理论的脆弱性缺陷,有助于开辟非脆弱PPC研究新领域。 展开更多
关键词 预设性能控制(PPC) 非脆弱PPC 误差感知 包络调整 预设可达
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谈松下磁带编辑录像机维修
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作者 张广明 《科技风》 2016年第23期104-104,共1页
本文主要论述了DVCPRO的技术指标及其后焦距调整,张力调整,镜头除尘,包络确认和调整等维护和维修过程。
关键词 DVCPRO50 后焦距调整 张力调整 镜头除尘 包络确认和调整
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Territorial Competitiveness in a Globalised Economy: Regional Efficiency of the Mexican Service Sector
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作者 Alejandra Berenice Trejo Nieto 《Chinese Business Review》 2011年第4期239-254,共16页
The existence of a solid service sector and some degree of specialisation in tertiary activities are among a number of territorial diversity of factors which need to be taken into account in relation to the creation o... The existence of a solid service sector and some degree of specialisation in tertiary activities are among a number of territorial diversity of factors which need to be taken into account in relation to the creation of competitive capacities. In addition globalisation has presumably played a significant role in the productive restructuring of economies in which the service sector has had an increasing quantitative and qualitative importance over the years Therefore, an evaluation of the role of services in constructing regional competitive capacities is required. This paper aims at addressing indirectly the meaning of services on improving competitiveness by providing a wide-ranging analysis of regional efficiency of the Mexican service sector and its determinants as well as an overview of its territorial distribution and special isation patterns. We evaluate the patterns of concentration of the third sector and its branches, and specialisation of regions. The efficiency of the service sector in the NAFTA period is analysed further because of the impact of services on regional competitiveness. We employ state leve data to examine technical efficiency's differentials across regions and their determinants. The methodology includes data envelopment analysis to measure technical efficiency which is the dependent variable in a reduced form model that links regional performance with a number of proxies for various types of agglomeration economies such as specialisation, urbanisation and internal economies of scale 展开更多
关键词 COMPETITIVENESS EFFICIENCY services Mexico
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