基于神经网络的城乡交错区土地估价方法

提出了城乡交错区土地价格评估的人工神经网络系统的基本构造，并在充分考虑城市规划对城乡交错区土地价格影响的基础上对神经网络的估价系统进行了设计，给出了构成城乡交错区土地价格的市场、区位、城市规划等方面影响因素的特性指标及特征指标的量化计算公式，以杭州市未来10年城市规划为基础，分析了杭州市城乡交错区各个片区的特征指标值，利用改进的BP神经网络模型对它们进行了训练和模拟。取得了良好的模拟结果，证明了ANN法用来预测城乡交错区地价的可行性和先进性。     

适用于IEEE 802.16e OFDMA系统的小区搜索算法

提出一种针对IEEE 802.16e 宽带正交频分复用多接入（OFDMA）工作模式的小区搜索算法.算法分为下行帧头检测和小区标识识别2个步骤.充分利用下行帧前导字的周期性，提出一种新颖的基于频域欧氏距离的帧头检测算法，有效地提高了检测的鲁棒性.提出一种相关窗长度自适应的小区标识识别算法，大大缩短了检测和识别时间.系统仿真结果表明，该算法具有较高的鲁棒性和搜索效率，是一种适合于IEEE 802.16e及其他OFDMA蜂窝系统的高效小区搜索算法.     

Systematic design of weighting matrices for the H∞ mixed sensitivity problem

A systematic design of weighting matrices for the H_∞ mixed sensitivity problem is presented in this paper. Once a nominal model has been chosen, an initial design of the weighting matrices based on the multiplicative output uncertainty is proposed. The final weighting matrices (which permit that an appropriate closed loop behavior is achieved)are obtained by tuning just one parameter for each output of the system. A multivariable control of two temperatures of a pilot plant (which constitutes a typical example of an industrial process) is included as an application where the validity of the proposed methodology has been tested.     

H∞ tracking of linear continuous‐time systems with stochastic uncertainties and preview

The problem of finite‐horizon H_∞ tracking for linear continuous time‐invariant systems with stochastic parameter uncertainties is investigated for both, the state‐feedback and the output‐feedback control problems. We consider three tracking patterns depending on the nature of the reference signal i.e. whether it is perfectly known in advance, measured on line or previewed in a fixed time‐interval ahead. The stochastic uncertainties appear in both the dynamic and measurement matrices of the system. In the state‐feedback case, for each of the above three cases a game theory approach is applied where, given a specific reference signal, the controller plays against nature which chooses the initial condition and the energy‐bounded disturbance. The problems are solved using the expected value of the standard performance index over the stochastic parameters, where, in the state‐feedback case, necessary and sufficient conditions are found for the existence of a saddle‐point equilibrium. The corresponding infinite‐horizon time‐invariant tracking problem is also solved for the latter case, where a dissipativity approach is considered. The output‐feedback control problem is solved as a max–min problem for the three tracking patterns, where necessary and sufficient condition are obtained for the solution. The theory developed is demonstrated by a simple example where we compare our solution with an alternative solution which models the tracking signal as a disturbance. Copyright © 2004 John Wiley & Sons, Ltd.     

SNMP在嵌入式操作系统(VxWorks)中的实现

简要分析了UCD—SNMP协议栈源码，并在此基础上介绍了SNMP简单网络管理协议在嵌入式操作系统的(VxWorks)的实现，从而提出了在各种嵌入式操作系统实现SNMP的方法。     

基于一般Lur''''e系统的混沌同步研究

许多混沌系统可以转化为一个Lur'e系统.本文采用时滞反馈控制技术研究了一般Lur’e系统的混沌同步问题,改进了最近有关文献的结果.通过利用Lyapunov—Krasovskii函数法得到了时滞无关的线性矩阵不等式(LMI)判据,而且还通过利用M-矩阵等方法,得到了易于检验的时滞相关与时滞无关的代数判据,利用这些结果给出了这种反馈控制器的设计方法;最后,给出的例子阐明了所得到的结果.     

VRLA电池早期失效原因探讨

从铅蓄电池正极板栅的腐蚀,负极板的硫酸化、电池自放电和热失控、电解液干涸等方面,阐述了VRLA铅蓄电池早期失效的主要原因;并从理论和实践上探讨了电池失效的一般原理;提出了VRLA电池在设计和生产过程中防止早期失效必须采取的措施。     

企业与商事主体的关系辨析

“企业主体论”是经济学的产物，将其不加辨别地移植入商法理论体系，存在着一系列重大的理论误区与陷阱。不论从语源意义，还是从法学方法论上，企业只能是一种客体存在，是通过物质的企业组织起来的权利、法律关系及事实关系的综合统一体，并且构成商事主体的资格依托和经营目的，代表和反映着商事主体经营方面的组织举措。还商事主体以本来面目，无疑是一种人文精神的回归。     

H∞ controller synthesis for pendulum-like systems

This paper focus on a stabilization problem for a class of nonlinear systems with periodic nonlinearities, called pendulum-like systems. A notion of Lagrange stabilizability is introduced, which extends the concept of Lagrange stability to the case of controller synthesis. Based on this concept, we address the problem of designing a linear dynamic output controller which stabilizes (in the Lagrange sense) a pendulum-like system within the framework of the H_∞ control theory. Lagrange stabilizability conditions for uncertainty-free systems and systems with norm-bounded uncertainty in the linear part are derived, respectively. When these conditions are satisfied, the desired stabilization output feedback controller can be constructed via feasible solutions of a certain set of linear matrix inequalities (LMIs).