计算机基础试卷自动生成系统的开发及应用

文章介绍了一种基于面向对象程序设计方法的计算机基础试题库系统的开发过程,对试题数据库的数据模型、系统的功能、总体设计思路以及系统目前的应用情况作了较详尽的介绍.     

具有完整性的控制系统设计方法

该文研究线性连续系统的容错控制问题，即设计反馈控制器，使闭环系统对可能的执行器失效具有完整性。该文利用代数方法，直接证明了期望的容错控制器的存在性，并导出了其解析表达式。最后，用数值例子说明这种方法的直接性与简单性。     

广义系统的某些性质

本文定义了广义系统的消失性,并给出了判别消失性的充要条件,进而给出了广义系统的闭环谱与其动态补偿器的谱不相交的充要条件.最后利用广义系统的一种特殊分解给出了广义系统脉冲可控的充要条件.     

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.     

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。