In this paper, a real-time computation method for the control problems in differential-algebraic systems is presented. The errors of the method are estimated, and the relation between the sampling stepsize and the con...In this paper, a real-time computation method for the control problems in differential-algebraic systems is presented. The errors of the method are estimated, and the relation between the sampling stepsize and the controlled errors is analyzed. The stability analysis is done for a model problem, and the stability region is ploted which gives the range of the sampling stepsizes with which the stability of control process is guaranteed.展开更多
The network analysis of a technological system combines the interindustry transactions with a matrix of sectoral innovative efforts as measured by R&D investment intensity.The matrixes of interindustry transaction...The network analysis of a technological system combines the interindustry transactions with a matrix of sectoral innovative efforts as measured by R&D investment intensity.The matrixes of interindustry transactions of R&D-embodied products(innovations)are weighted matrixes where the interindustry flows measure the intensity of the innovation diffusion.In the past,studies using this approach in innovation studies have transformed weighted matrixes into binary matrixes of zero and one element where the flows less than a selected threshold value were considered to be zero and the flows greater than the threshold value were counted as one.Such matrix transformation leads to the loss of a great deal of information.In the present study,using degree and clustering coefficients for both binary direct as well as weighted direct techno-economic networks of the manufacturing sector of the German economy,we show that the binary directed network analysis is incapable of refined ranking of interindustry innovation transactions.The total degree index based on the weighted network of the German techno-economic system assigns a unique ranking to each sector,and clustering coefficients show that at least 75%of sectors in the network of Germany have two links with the other industries.However,the same indices based on the binary network are incapable of such refined ranking.展开更多
分布式控制系统(Distributed control system,DCS)是现代工业系统中实时监控子系统,负责采集系统运行的实时数据,实现生产过程的实时监控。由于DCS采集的数据集特有的海量性与高维性,使得通过整体分析全部DCS数据,从而掌握系统的综合运...分布式控制系统(Distributed control system,DCS)是现代工业系统中实时监控子系统,负责采集系统运行的实时数据,实现生产过程的实时监控。由于DCS采集的数据集特有的海量性与高维性,使得通过整体分析全部DCS数据,从而掌握系统的综合运行状态的一切传统方法难以奏效,因此目前对于DCS数据的利用还处于原始的单点监控状态。为有效利用DCS数据判断系统的整体运行状态,将数字图像引入系统分析中,定义一个由二维欧氏平面空间和三维色彩空间联合构成的,与DCS数据所在拓扑空间同胚的乘积空间,色彩相空间。将DCS数据映射到色彩相空间,构造系统平面彩色图谱,反映复杂系统变量之间的内在联系,提出一个全新的解决思路。系统平面彩色图谱可以从宏观层面结合定性与定量将系统多变量之间的非线性、高耦合性关系直观地反映出来,从而解决复杂系统多变量关系难以建立精确的解析形式的问题,将复杂问题直观化、形象化、简单化。展开更多
文摘In this paper, a real-time computation method for the control problems in differential-algebraic systems is presented. The errors of the method are estimated, and the relation between the sampling stepsize and the controlled errors is analyzed. The stability analysis is done for a model problem, and the stability region is ploted which gives the range of the sampling stepsizes with which the stability of control process is guaranteed.
基金We thank the anonymous referees for their constructive comments on an earlier version of this paper.
文摘The network analysis of a technological system combines the interindustry transactions with a matrix of sectoral innovative efforts as measured by R&D investment intensity.The matrixes of interindustry transactions of R&D-embodied products(innovations)are weighted matrixes where the interindustry flows measure the intensity of the innovation diffusion.In the past,studies using this approach in innovation studies have transformed weighted matrixes into binary matrixes of zero and one element where the flows less than a selected threshold value were considered to be zero and the flows greater than the threshold value were counted as one.Such matrix transformation leads to the loss of a great deal of information.In the present study,using degree and clustering coefficients for both binary direct as well as weighted direct techno-economic networks of the manufacturing sector of the German economy,we show that the binary directed network analysis is incapable of refined ranking of interindustry innovation transactions.The total degree index based on the weighted network of the German techno-economic system assigns a unique ranking to each sector,and clustering coefficients show that at least 75%of sectors in the network of Germany have two links with the other industries.However,the same indices based on the binary network are incapable of such refined ranking.
文摘分布式控制系统(Distributed control system,DCS)是现代工业系统中实时监控子系统,负责采集系统运行的实时数据,实现生产过程的实时监控。由于DCS采集的数据集特有的海量性与高维性,使得通过整体分析全部DCS数据,从而掌握系统的综合运行状态的一切传统方法难以奏效,因此目前对于DCS数据的利用还处于原始的单点监控状态。为有效利用DCS数据判断系统的整体运行状态,将数字图像引入系统分析中,定义一个由二维欧氏平面空间和三维色彩空间联合构成的,与DCS数据所在拓扑空间同胚的乘积空间,色彩相空间。将DCS数据映射到色彩相空间,构造系统平面彩色图谱,反映复杂系统变量之间的内在联系,提出一个全新的解决思路。系统平面彩色图谱可以从宏观层面结合定性与定量将系统多变量之间的非线性、高耦合性关系直观地反映出来,从而解决复杂系统多变量关系难以建立精确的解析形式的问题,将复杂问题直观化、形象化、简单化。