共查询到20条相似文献，搜索用时 31 毫秒
1.
This paper gives an extension of the Volterra-functional method to the analysis of nonlinear systems with both stochastic input and stochastic parameters. In Section II, first-order linear systems with stochastic input and stochastic parameter are analyzed. Certain definitions and symbolic relations are established. A special example in which the stochastic input and the stochastic parameter are closely related is given in Appendix I. Section III deals with the analysis of first-order nonlinear systems with both stochastic input and stochastic parameter, by means of the Volterra-functional method. A simpler analysis by extension of the Transform-ensemble method is given in Appendix II. Section IV presents the detailed analysis of nonlinear stochastic systems with four illustrative examples. The analysis can be extended to a class of nonlinear stochastic systems with higher-order linear plants with constant or time-varying parameters. 相似文献
2.
Sampled-data control for time-delay systems 总被引：1，自引：0，他引：1
The sampled-data systems are hybrid ones involving continuous time and discrete time signals, which makes the traditional analysis and synthesis methodologies of time-delay systems unable to be directly used in the cases of hybrid systems with time-delay. The primary disadvantages of current design techniques of sampled-data control are their inabilities to deal effectively with time-delay and the model uncertainty. In this paper, we generalized the analysis methodology of time-delay systems to that of the hybrid systems with time-delay and uncertainty, which developed a design procedure of sampled-data control for time-delay systems. Asymptotic stability of the time-delay hybrid systems was developed. The time-delay dependent robust sampled-data control for the time-varying delay of an uncertain linear system was then discussed. The results were described as linear matrix inequalities, which can be solved using newly released LMITool. 相似文献
3.
《普罗米修斯》2012,30(1):17-31
This paper seeks to provide an understanding of knowledge creation and dissemination through an exploration and analysis of knowledge systems. It begins with a brief review of the systems of innovation approach. This is followed by a discussion of knowledge systems in which the nature of knowledge is considered and a definition of knowledge systems is outlined. A conceptual analysis of knowledge systems is provided in which they are compared and contrasted with systems of innovation. The conceptual framework presented is then examined more fully within the context of the computer services sector. Finally, conclusions are drawn and directions for further research are outlined. 相似文献
4.
Distributed systems consist of interconnected, lower-dimensional subsystems. For such systems, distributed analysis and design present several advantages, such as modularity, easier analysis and design, and reduced computational complexity. A special case of distributed systems is when the subsystems are connected in a string. Applications include distributed process control, traffic and communication networks, irrigation systems, hydropower valleys, etc. By exploiting such a structure, in this paper, we propose conditions for the distributed stability analysis of Takagi–Sugeno fuzzy systems connected in a string. These conditions are also extended to observer and controller design and illustrated on numerical examples. 相似文献
5.
This paper focuses on the role of the computer system in group decision-making. Two systems used in solving negotiating problems and three procedures which can be utilized to develop group decision support systems are analysed and a unified approach for the analysis is presented. The systems and procedures are based on multicriteria decision analysis and use mathematical programming models. They can play different roles: systems intervention in the negotiating process can be used merely to facilitate the process, or the system can actively mediate negotiations; both roles are discussed here. 相似文献
6.
This publication discusses ways of using cognitive analyses for semantically interpreting economic figures. A semantic analysis making use of mathematical linguistic algorithms in order to extract meaning from sets of analysed data is illustrated with an example of a class of cognitive systems designed to analyse economic figures, or more precisely, financial ratios. The cognitive analysis systems presented in this publication are discussed as exemplified by the class of Cognitive Financial Analysis Information Systems (CFAIS). This publication proposes algorithms executed by a broad class of automatic data interpretation and understanding systems designed for the in-depth semantic analysis and interpretation of the results obtained. This will be done by defining new system classes as applications supporting decision-making processes, useful in various areas of knowledge. 相似文献
7.
This paper studies the stability analysis problems of periodic piecewise systems, in which subsystems are given in the time-varying polynomial forms. A Lyapunov function with continuous time-varying Lyapunov matrix is adopted, which relaxes constraints on the variation of Lyapunov function in each subsystem. Using the time interval information, the exponential stability and stabilizing controller synthesis are studied. The results provide a possible alternative method to study the general periodic time-varying systems, which may further support the analysis and synthesis of general periodic systems. The effectiveness of the proposed method is validated and illustrated via numerical examples. 相似文献
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资源系统工程的研究与应用 总被引：2，自引：1，他引：1
本文从资源定义出发,提出资源系统是指在一定区域内能够产生经济价值的、以提高人类当前和将来福利因素和条件的复杂系统。资源系统工程是对资源系统进行合理规划、设计和运行管理的一门交叉学科。研究分析认为：资源系统工程的理论基础是系统工程理论、系统工程技术和资源科学,研究的主要内容为资源系统规律、资源开发利用、资源协调控制,并初步确定了资源系统工程研究的方法论和学科体系。文章最后指出资源生态学、资源信息学的研究、资源系统定量分析,以及现代工程技术和方法的采用是资源系统工程研究的重点方向。资源系统工程是一门正在孕育发展中的学科,有待进一步去探索。 相似文献
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This paper proposes a time domain approach to deal with the regional eigenvalue-clustering robustness analysis problem of linear uncertain multivariable output feedback proportional-integral-derivative (PID) control systems. The robust regional eigenvalue-clustering analysis problem of linear uncertain multivariable output feedback PID control systems is converted to the regional eigenvalue-clustering robustness analysis problem of linear uncertain singular systems with static output feedback controller. Based on some essential properties of matrix measures, a new sufficient condition is proposed for ensuring that the closed-loop singular system with both structured and mixed quadratically-coupled parameter uncertainties is regular and impulse-free, and has all its finite eigenvalues retained inside the same specified region as the nominal closed-loop singular system does. Two numerical examples are given to illustrate the application of the presented sufficient condition. 相似文献
12.
Components within micro-scale engineering systems are often at the limits of commercial miniaturization and this can cause unexpected behavior and variation in performance. As such, modelling and analysis of system robustness plays an important role in product development. Here, schematic bond graphs are used as a front end in a sensitivity analysis based strategy for modelling robustness in multi-physics micro-scale engineering systems. As an example, the analysis is applied to a behind-the-ear (BTE) hearing aid.By using bond graphs to model power flow through components within different physical domains of the hearing aid, a set of differential equations to describe the system dynamics is collated. Based on these equations, sensitivity analysis calculations are used to approximately model the nature and the sources of output uncertainty during system operation. These calculations represent a robustness evaluation of the current hearing aid design and offer a means of identifying potential for improved designs of multiphysics systems by way of key parameter identification. 相似文献
13.
通过对志愿服务内涵及医学生自身特点的简单分析,从志愿服务搭建医学生全面成长的有效平台;志愿服务有利于医学生长才干、精专业;志愿服务提供医学教育PBL教学的“实验场”;志愿服务促进社会和谐、创造经济效益等方面探讨了志愿服务在医学生成才中的作用,基于这种内在关系的分析,提出从组织机构、培训体系、评议制度、汇报制度、评价体系等方面积极探索,努力构建医学生志愿服务体系。 相似文献
14.
提出了一个结构系统可靠性分析的载荷传递路线并联模型,讨论了结构系统可靠度的计算、载荷传递路线集的枚举主要载荷传递路线集的鉴别。所举的两个算例表明,结构系统可靠性分析的载荷传递路线模型是有效的。 相似文献
15.
国内外学术界均强调交互记忆系统和动态能力都对企业创新绩效有积极作用,研究也证实了交互记忆系统是企业获得动态能力的源泉,但三者的关系缺乏相应的研究。本文将交互记忆系统和动态能力整合到一个研究框架下,构建了全新的理论模型,研究交互记忆系统、动态能力与创新绩效的关系,来了解变量间的传导机制与影响路径,并运用多元回归方法对长三角地区229份有效问卷进行了实证分析。研究结果表明:动态能力在交互记忆系统的专长性和创新财务绩效的关系中起了部分中介作用,在专长性和创新成长绩效关系中起了完全中介作用,在交互记忆系统的协调性与创新绩效的关系中起了完全中介作用。 相似文献
16.
In this article, we put forward a concept for the identification and analysis of future development options of technological innovation systems. The key element of our approach, the so-called variation analysis, is a methodology to identify coherent socio-technical and organizational variants within a specific innovation field. Consistent combinations of these two dimensions may be interpreted as nuclei for alternative future developments of innovation systems. The method may be used in discursive foresight processes to inform strategy formulation of firms or policy makers who see a utility in furthering the innovation field. The paper has a focus on developing the theoretical background and the analytical structure of the methodology. Empirically, we illustrate the method for the innovation system of biomass digestion in Switzerland. 相似文献
17.
[研究目的]战略情报分析主要是由情报专家人工分析为主,在信息系统方面的建设还比较薄弱,文章结合情报分析过程,提出基于孙子情报分析理论构建标签体系,作为信息系统设计实现的一种参考。[研究方法]通过孙子情报分析理论、标签的定义、战略情报分析过程描述了战略情报分析标签体系的构建及其作用,提出了以顶层标签作为切入点构建战略问题分析模型,以及战略情报分析计算模型。[研究结论]标签体系应用广泛,以孙子情报分析理论的“道、天、地、将、法”为基础构建战略情报分析标签体系,进行战略问题分析建模与计算,对战略情报分析研究和相关信息系统建设具有一定的指导意义。 相似文献
18.
A unified approach to stability analysis of feedback control systems with pulse-width modulators is discussed. The proposed procedure is developed on the basis of the discrete analog of Lyapunov's method, with no limiting hypothesis on the structure of the controlled plant and of the modulation law.The analysis is exemplified particularly for lead-type PWM control systems. Significant plant classes are investigated, and the critical values of parameters in a closed form are determined which assure asymptotic stability of the steady-state solution, whatever the reference input may be. 相似文献
19.
This paper is an attempt to present disclosive ethics as a framework for computer and information ethics – in line with the
suggestions by Brey, but also in quite a different manner. The potential of such an approach is demonstrated through a disclosive
analysis of facial recognition systems. The paper argues that the politics of information technology is a particularly powerful
politics since information technology is an opaque technology – i.e. relatively closed to scrutiny. It presents the design
of technology as a process of closure in which design and use decisions become black-boxed and progressively enclosed in increasingly
complex socio-technical networks. It further argues for a disclosive ethics that aims to disclose the nondisclosure of politics
by claiming a place for ethics in every actual operation of power – as manifested in actual design and use decisions and practices.
It also proposes that disclosive ethics would aim to trace and disclose the intentional and emerging enclosure of politics
from the very minute technical detail through to social practices and complex social-technical networks. The paper then proceeds
to do a disclosive analysis of facial recognition systems. This analysis discloses that seemingly trivial biases in recognition
rates of FRSs can emerge as very significant political acts when these systems become used in practice.
Paper prepared for the Technology and Ethics Workshop at Twente 相似文献
20.
《Journal of The Franklin Institute》2022,359(3):1130-1151
This paper is concerned with the simultaneous exponential stabilization problem for a set of stochastic port-controlled Hamiltonian (PCH) systems. Due to the limited bandwidth of the channels, the phenomena of fading channels and transmission delays which are described by a time-varying stochastic model always occur in the communication channels from the controller to the actuator. Meanwhile, actuator saturation constraint is taken into account. On the basis of dissipative Hamiltonian structural and saturating actuator properties, those stochastic PCH systems are combined to generate an augmented system. By utilizing the stochastic analysis theory, sufficient criterions are given for the simultaneous stabilization controller design ensuring that the closed-loop system is simultaneously exponentially mean-square stable (SEMSS). For the case that there exist external disturbances in the systems, some results on stability analysis and controller design are given. The developed controller design scheme is proved by a three-helicopter model simulation example. 相似文献