The design of vsc for uncertain discrete time systems is discussed . a grey estimating model is built for the uncertain part and thus values of parameters are obtained . simulation results are presented to illustrate that the method in the thesis is rational 四、研究了不确定系统的离散时间变结构控制，利用灰色系统理论，对不确定部分建立灰色估计模型，给出仿真数例，结果表明此方法是合理的。
Moreover , the theory research and application reported of vsc appeared in the field of state estimation , discrete time system control , time delay control , robust control for uncertain systems , adaptive control , output feedback control and so on 现今在状态估计、离散系统控制、时滞系统控制、不确定性系统的鲁棒控制、自适应控制、预测控制、输出反馈控制等方面均有变结构控制理论的研究和报道。
The design problem of robust output feedback model predictive controllers is considered which guarantees that the closed - loop system is asymptotically stable and an on - line receding horizon guaranteed cost is minimized for a class of uncertain discrete time - delay systems with i / o constrains 摘要对一类输入输出受限的不确定离散时滞系统，研究了使得闭环系统渐近稳定且滚动时域性能指标在线最小化的鲁棒预测输出反馈控制器设计问题。
Feasibility of this method is verified by simulation . the vsc by use of the sensorless magnetic bearing is investigated for the first time . the state space model of sensorless amb milling spindle is formulated and a discrete time vsc strategy is presented to stabilize the spindle system 仿真结果表明,采用变结构控制的无传感器磁悬浮主轴系统对于外扰动及系统模型摄动的鲁棒性、以及在变切厚情况下的控制效果均明显强于pid控制器。
In chapter 5 , both the convergence of discrete time cellular neural networks with the non - reciprocal templates in interacting updating mode , in non - interacting updating mode , and some properties of strict networks with value of zero threshold are studied 第五章研究了模板非互补的离散时间细胞神经网络在细胞相互作用演化方式和非相互作用演化方式下的收敛性，并且对并行和串行演化模式下的阈值为零的严格网络的吸引域的一些特性进行了研究。
The third , synchronization in unidirectionally coupled 4 - order hyperchaotic chua ' s circuits is studied . synchronization of hyperchaotic systems can be achieved using only one variable unidirectionally coupled at discrete times . we obtain the threshold of couple coefficient based on lyapunov stability theory 第三，采用单向耦合方法实现了两个四阶蔡氏超混沌电路的同步，根据lyapunov稳定性定理，得到了两个系统达到同步时耦合系数的阈值。
In ( ( actuarial mathematics ) ) n . l . bower etc . specially have discussed the discrete time risk model in which the premium income of per unit time is regarded as a constant , the claim amount of each period time is regarded as independent and identically distributed random variable N . l . bower等人在《 actuarialmathematics 》一书中专门讨论了离散时间的风险模型，该模型将单位时间内收取的保费视为常数，每一时期的理赔量视为独立同分布的随机变量
To answer the first question , a method is developed to store the inventory data at only some discrete time ponts . these time points are determined by time interval and events defined in this paper . for the second question , we use soft computing to recovery the state at any time point 文中还提供了一个库存动态管理的开发实例，连续问题离散化的方法和库存动态管理仿真算法在该系统中得到应用，并很好的实现了原油库存的动态管理，其中动态库存管理在计划与调度过程中也是必要的。
