A UNIFIED THEORY OF ATTRACTION IN GENERAL SYSTEMS

Attraction (or asymptoticily) is defined for a general space-time system consisting of a set endowed with a preorder (the “flow”), a family of monotone mappings (the “time scale”) and two collections of subsets, or quasifilters (a kind of generalized neighborhood systems).

Thus, the notion of attraction is presented under the weakest possible conditions which allow us its adaptation to a wide variety of special situations. Within this framework we state necessary and sufficient conditions for asymptoticity in terms of Liapunov-type functions.     

THE LANGUAGE OF GENERAL SYSTEMS LOGICAL THEORY (GSLT)

The syntactic and semantic aspects of the formal language of general system logical theory (GSLT) are presented. Following an introduction to the language of GSLT, we show the power of GSLT in a number of different areas. One possible model for GSLT is category theory. The categorical structures we formally expressed by a network of elementary logical system (ELS), basic components of GSLT. GSLT uses the input-output paradigm to transform the static classical form of categorical structures to dynamic transformations of objects and morphisms. Connection with general system theory and Klir's general system problem solver (GSPS) is given.     

THE EPISTEMOLOGY OF THE GENERAL SYSTEMS PROBLEM SOLVER

Abstract

In this paper, I draw a connection between the so-called classical definition of knowledge and the epistemological framework underlying George J. Klir's General Systems Problem Solver methodology. More specifically, I suggest that it is very close to the Representational Realism articulated by such early empiricists as John Locke. However, I also point out that the GSPS epistemology has an affinity to the so-called constructivist view of knowledge, one that t argue is not compatible with Representational Realism     

一类时滞不确定非线性系统的鲁棒控制器设计

针对一类具有单输入滞后不确定非线性系统, 采用精确反馈线性化方法和Lyapunov方法设计出一种使系统终极有界(UUB)的无记忆光滑状 态反馈鲁棒控制器．仿真算例表明了本文所采用方法的有效性．     

应用框架法的化工过程系统通用模型

企业领域的面向对象应用框架研究是现代面向对象应用框架技术的重要趋势之一.应用框架可以增强大型应用软件代码的重用性和可扩充性.针对目前化工过程系统软件中存在的问题,采用面向对象应用框架方法,建立起化工过程系统的通用模型.结合使用本模型完成的国家教委项目--化工仿真系统来阐述该模型.     

奇异系统的输出稳定化通过一般状态反馈的可解性

讨论了奇异系统的输出稳定化问题，得到了在初始值为容许且不保证闭环正则的情形下，通过一般状态反馈求解此问题的充要条件及计算步骤     

多采样率数字控制系统综述

本文给出了多采样率数字控制系统的发展和目前研究情况的综述．根据系统中各采样周期之间的关系，多采样率控制系统可以分为输入多采样率控制系统输出多采样率控制系统和广义多采样率控制系统等．它们又分别对应于采用广义保持器、广义采样器和周期时变控制器的数字控制系统．文中对这三类系统的特点和近期研究成果进行了系统的介绍与讨论．由于“因果条件”， 多采样率控制器具有结构约束．本文综述了几类满足这一结构约束的多采样率控制器的设计方法和各类多采样率控制系统．     

TREE-LIKE HIERARCHY OF SYSTEMS

In this paper the concepts of tree-like hierarchy of systems and linked hierarchy of systems are introduced. The concepts can be seen as generalizations of those of time systems and linked time systems, respectively; moreover, the concepts can be used to establish models of social organizations and of the development of a cultural entity. Some open questions are posed.     

THE GENERAL SYSTEMS DEPOSITORY Its Mission and Operation

This paper describes the program of Systems education at the University of Pennsylvania. The program is managed by the Department of Systems which is housed in the School of Engineering and Applied Science. It discusses the structure of the program both for undergraduate and graduate education. In addition it attempts to show the broadness of the program by discussing briefly a new course which is taken by all undergraduates and the majority of graduate students in problem formulation using the systems approach.     

广义不确定系统稳定鲁棒控制

利用李雅普诺夫稳定理论和矩阵范数性质研究了广义不确定系统的稳定鲁棒控制问题.在不同情况下,分别给出了保证闭环不确定系统渐进稳定的两类稳定鲁棒控制:状态反馈、正常动态补偿器的设计方法,得到了鲁棒稳定控制的不确定量的范数界,而且提出了在多个稳定鲁棒控制器中寻找具有最大的不确定量范数界的控制器的方案.     

概念格上规则提取的一般算法与渐进式算法

许多研究表明概念格是数据分析与规则提取的一种有效工具。本文首先提出一种在对象与描述符数目较多、概念聚类具有一定规模条件下,在已建造好的概念格上有效地提取规则的算法。这种方法主要依据格结点的直接泛化来产生相应无冗余规则,然后改进了一种渐进式更新概念格与相应Ｈａｓｓｅ图的算法,并将之应用于渐进式提取规则。目前,这些方法已用于我们所开发的数据库知识发现工具原型系统中。     

线性时滞系统的输入-输出能量解耦

提出一种针对具有时变时滞的线性时滞系统的能量解耦方法,即从输入-输出的能量关系上实现解耦,使得任何一个输入的能量主要控制对应的一个输出的能量,对其它输出能量的影响尽可能小.该解耦方法兼有静态解耦与动态解耦的特点.所有结论均由线性矩阵不等式描述.     

基于XML和XSLT的通用报表系统的设计与实现

针对当前Web报表生成技术的一些局限性,提出了基于XML和XSLT(Extensible Stylesheet Language Transformations)的通用Web报表生成技术.对具体的系统架构和技术优势进行了阐述,并结合笔者所在单位自主研发的教务管理系统中的报表需求,给出了详细的设计和实现过程.     

通用查询系统的设计与实现

本文根据作者在实际数据库系统开发中，采用ＰｏｗｅｒＢｕｉｌｄｅｒ开发的一个通用查询系统，详细介绍了其设计与实现的思想。同时，也对大型数据库管理系统在设计时，如何考虑下载数据的查询，提供了一个好的解决方案。     

机械传动系统的自动布置设计

布置设计是连接产品概念设计与结构设计的桥梁,本文以龙门铣变速箱能ＣＡＤ系统的研究为背景,探讨了机械传动系统的计算机自动布置原理和方法,本文将产品布置设计划分为２个层次,提出了基于实例的定性布置和基于约束的参数布置相结合的布置设计求解框架。同时还提出了一种描述传动系统布置设计的表达模型－二维双向链表,该链表能统一描述与布置设计有关的信息,支持自顶向下的产品设计模式。     

实时系统软件开发过程中形式方法的作用

针对实时系统软件开发的特殊性要求,本文强调形式方法是保证实时系统软件开发正确的一种重要方法。文章首先对形式方法的含义进行了系统的介绍,然后分析了形式方法的三个分支在实时系统软件开发过程中的作用,即形式规约、定理证明、形式验证,并指出了形式方法当前主要应用的能力以及应用的局限性,最后提出了形式方法的一些主要研究方向。     

非线性时变系统开闭环P型迭代学习控制的收敛性

对于非线性时变系统,给出了其开闭环P型迭代学习控制收敛的充要条件.这些收敛条件与被控系统状态方程的具体形式无关.对比表明,该文的结论改进了现有结果.     

THE CRYPTOLOGY OF MULTIPLEX SYSTEMS

A German diplomat sends a phony message - a rarity in the documented history of cryptology.     

AN LMI APPROACH TO ROBUST STABILITY OF UNCERTAIN DISCRETE SINGULAR TIME‐DELAY SYSTEMS

The problem of robust stability analysis for uncertain discrete singular time‐delay systems is investigated in this paper. By decomposing the nominal system into slow and fast subsystems, a linear matrix inequality (LMI) condition is proposed for a discrete singular time‐delay system to be regular, causal and stable. Based on this, an LMI criterion is obtained for robust stability of an uncertain discrete singular time‐delay system. Two numerical examples are provided to demonstrate the feasibility of the proposed approach.     

STRONG STABILIZATION OF MIMO SYSTEMS: A PROJECTION APPROACH

In this paper, the strong stabilization problem of multivariable linear time‐invariant systems is considered. The approach is based on state‐space stable projection. The formulation is reduced to find a full rank constant output feedback. The computations involved are simpler than other methods.