By the research in this paper , the problems of stability and tracking for nonlinear systems have been properly solved by using backstepping and lyapunov synthesis method and supervisory control and error compensation ; the adaptive fuzzy control problems of nonlinear continuous systems have also been properly solved . the schemes presented can guarantee the global stability of the closed - loop control systems with tracking error converging to zero , while the modeling error exists . they can improve the performance of the systems and their robustness 通过本文的研究，较好地将后推法、李亚普诺夫综合方法、监督控制及误差补偿相结合，解决了一类非线性系统的稳定性问题和跟踪问题；接着解决了siso 、 mimo非线性连续系统的模型参考自适应模糊控制问题，提出的模糊控制器设计方案在建模误差存在的情况下，能够保证闭环系统全局稳定，且系统跟踪误差收敛到零。
By use of - perturbation method with spatial discretization , the hydraulic transient system controlled by quasilinear partial differential equation was converted to a time - continuous linear system , so that the inverse problem of hydraulic transients under limited pressure could be sol ed with the optimal control theory for time - continuous systems 采用-摄动法并经过空间离散，将由拟线性偏微分方程控制的有压瞬变流系统转化为时间连续线性系统，从而使有压瞬变流限压控制反问题能应用时间连续系统最优控制理论来求解。
These systems are different from not only the continuous systems that are described with differential equations but also the discrete systems that are described with difference equations . the used knowledge is not applicable to these new problems . the demand to study these systems prompts the development of theory of discrete event dynamical systems ( deds ) 由于这些系统不同于用微分方程描述的连续系统，也不同于用差分方程描述的离散系统(数字系统) ，以往的理论体系已难以适用于这些新的问题，基于对这类系统行为和性能研究的需要，推动了离散事件动态系统( discreteeventdynamicalsystem ， deds )理论的形成和发展。
Considering the state - of - the - art of such kind of structural system , the author gives a simulative analysis of the system with the feiyunjiang bridge in wenzhou zhejiang province as an engineering example using three methods : 3 - d beam or bar fem , classical plate / shell fem and virtual laminated element method . the virtual laminated element method may deals with many key issues in simply - supported - continuous system easily such as the matter of actual material or virtual material , mesh replacement 针对国内外对先简支后连续结构体系的研究普遍缺乏深度这一现状，我们以浙江温州瑞安市飞云江大桥引桥为工程背景，运用空间梁杆系有限元、经典的板壳单元法以及虚拟层合单元法对该体系进行了施工仿真分析。
In july 1998 , the ieee standardization group selected the ofdm modulation technique for their new ieee802 . 1l a standard , targeting data transmission from 11 up to 54 mbps . meanwhile , this new ieee standard is the first one to use ofdm in packet based communications . ( before the proposal of this standard , use of ofdm was limited to continuous systems ) in this paper , the author firstly presents the technical characteristics and the typical application of wireless local area network ( wlan ) , analyzes its topology structure , the network configuration and etc . then the author illustrates the media access control and the operation and frame structure of physical layer 1998年7月， ofdm技术正式被ieee标准组确定为ieee802 . 11a物理层调制方法，使得无线局域网数据传输速率由11mbps提高到54mbps ，性能得到明显改善。同时该标准是第一个将ofdm技术应用于包传输通信中的ieee标准(在该标准提出以前， ofdm的使用通常局限于连续传输系统中) 。本文中，作者首先介绍了无线局域网的技术特点和典型应用，分析了其拓扑结构、网络配置功能等。
