节能气动系统数学模型的改进

作者曾提出一种节能近50%的节能气动系统,进行了理论与实验研究。本文重新定义特征时间 T_m~″和有效面积比 a_(?)~″,改进了它的退回阶段Ⅲ的动特性数学模型,使之能更准确地描述系统的真实特性,仿真结果与实验结果更趋一致。     

Application of the Constrained Predicated Nets and Interval Logic to Production Systems

1 .INTRODUCTIONDuetotheireconomicsignificanceandclosenesstopersons,productionsystemsmustbemodeledbeforetheirimplementationanduse,thus,amethodwhichspecifies ,analyzesandsynthesizestheproductionsys tems—discreteeventsystems (DES)hasbeenestab lishedanddevelopedstepbystepinrecentyears.DESmethodspecifiestheplantbasedonitsdiscretecharacters,however,intherealworld ,therearefewplantsthatcanbemodeledbypurelydiscretemathe maticalmodelbecausetherearealwayssomecontinu ousparametersforstudyinnearlya…     

STABILITY CRITERIA FOR A CLASS OF UNCERTAINSYSTEMS WITH TIME—DELAY

Some stability criteria are obtained for a class of uncertain systems with time-delay usingLyapunov functional and analytic techniques. It is easy to check the criteria by making use of theboundedness of the uncertainties.     

支持产品创新的分散网络化制造

阐述了产品创新与对企业赢得竞争的重要性，分析了产品快速开发的支撑体系，并通过实例描述了分散网络化制造的全过程，这种网络联盟企业将对我国制造业提高产品创新能力，缩短新产品上市周期、提高产品开发质量、快速响应市场产生显著的效果。     

AVAILABILITY ANALYSIS OF THE QUEUEING SYSTEM GI/PH/I WITH SERVER BREAKDOWNS

In the existing literature of Repairable Queueing Systems (RQS), i.e., queueing systems with server breakdowns, it is almost all assumed that interarrival times of successive customers are independent, identically exponentially distributed. In this paper, we deal with more generic system GI/PH/1 with server's exponential uptime and phase-type repair time. With matrix analysis theory, we establish the equilibrium condition and the characteristics of the system, derive the transient and stationary availability behavior of the system.     

SWITCHING CONTROL： FROM SIMPLE RULES TO COMPLEX CHAOTIC SYSTEMS

This paper reviews and introduces some simple switching piecewise-linear controllers, which can generate complex chaotic behaviors from simple switching systems.The mechanism of simple switching rules creating complex chaotic behaviors is further investigated.     

ANALYSIS OF REGIONAL ECONOMY GROWTH WITH THE THEORY OF DIFFERENTIAL SYSTEM DYNAMICS

In order to describe the interrelation forces among different regions during the economic growth, this paper introduces and analyzes the dynamical system model with the theory of differential systems dynamics. A practical example based on a simplified model is given to analyze the dynamical process of Sichuan economy growth.     

稳定性理论中的两个问题

本文讨论了吸引性与稳定性的关系,完善了稳定性的数学理论及应用一文中关于周期系统稳定与一致稳定等价的证明。     

1999—2001年《系统工程理论与实践》载文统计分析

对1999－2001年《系统工程理论与实践》所载论文从数量、内容、地区分布、系统分布和引文分布情况进行计量分析，各项统计结果显示，该杂志：1）载文信息量大，论文内容具有很强的导向和推动作用；2）期刊定位准确，具有独特的学术风格；3）作者体覆盖面广，但又集中于经济、科技较发达的地区；4）近期引文率高，载文内容新颖。     

基于多Agent的协同工作环境的实现

为了支持跨平台、异构环境下的协同工作,提出了一个基于多Agent的网上协同工作环境(multi-agent based cooperative work, MACW),构造了MACW系统的三层逻辑模型以及多Agent和浏览器/服务器相结合的系统结构,并结合多Agent技术、JMF等关键技术给出了系统的具体实现。MACW较好的解决了现有的协同工作环境存在的灵活性差、扩展能力不足、对意外情况不能及时处理等问题。