基于PSD系列芯片的单片机电路设计

简要介绍了如何使用ＰＳＤ芯片来构成单片机系统的硬件电路。     

Gain Scheduled Output Feedback Control Based on LTI Controller Interpolation that Preserves LPV H ∞ Performance

A new approach to the design of a gain scheduled output feedback controller based on linear time-invariant (LTI) controller interpolation that preserves H performance without a varying-parameter rate feedback is proposed. After the controller design is translated into parameterized linear matrix inequalities about parameter matrices based on a parameter-dependent Lyapunov function, the sufficient condition is given for the partition of the varying-parameter set based on the concept of H performance covering. The varying-parameter set is thus partitioned into sufficiently small subsets. After the constant matrices are found for each of the subsets, the required continuous parameter matrices are obtained by using interpolation. The proposed controller overcomes the drawback that the gain scheduled controller may not be found by using the existing gain scheduled linear parameter varying (LPV) controller synthesis. Moreover, the varying-parameter rate feedback is eliminated and the conservatism of the controller design is reduced by means of limiting the upper bound of the varying-parameter rate. Simulation and experiment results prove the effectiveness of the proposed controller.     

角色扮演游戏引擎的设计原理

角色扮演游戏（RPG）是深受广大游戏迷们喜爱的一种游戏,它向人们提供了超出现实生活的广阔的虚拟世界,使人们能够尝试扮演不同的角色,去经历和体验各种不同的人生旅程或奇幻经历,而这些体验都是在现实生活中无法实现的。本文主要论述角色扮演游戏引擎的原理、开发工具、开发技术以及游戏制作。     

面向服务架构的ERP软件设计新思路

传统构架下的ERP软件,在实际应用中出现了许多问题.文章介绍了一种新的软件架构方法--面向服务架构(SOA)的理念及其特点,并对面向服务架构的ERP和面向对象架构的ERP分别在体系结构和开发方法上作比较,最后选取SAP公司的NetWeaver和ESA产品设计理念作为案例,进一步阐述了SOA思想在ERP设计中的应用特点和优势.     

直齿锥齿轮参数化三维建模方法

介绍了在AutoCAD 环境下,用Autolisp 语言编程在计算机上实现直齿锥齿轮参数化三维建模的方法.程序设计是基于齿轮范成法切齿原理.使用该研究成果,只需加载Autolisp程序,输入模数、齿数、齿轮分度圆锥角等参数,便可以自动生成刀具和轮坯,齿轮的轮齿由刀具与轮坯间的相对滚切而形成.程序中还设计了轴、孔及键槽等结构,最后生成按指定参数的标准直齿锥齿轮模型.     

Research on Stress and Strength of High Strength Reinforced Concrete Drilling Shaft Lining in Thick Top Soils

High strength reinforced concrete drilling shaft linings have been adopted to solve the difficult problem of supporting coal drilling shafts penetrating through thick top soils. Through model experiments the stress and strength of such shaft linings are studied. The test results indicate that the load beating capacity of the shaft lining is very high and that the main factors affecting the load bearing capacity are the concrete strength, the ratio of lining thickness to inner radius and the reinforcement ratio. Based on the limit equilibrium conditions and the strength theory of concrete under multi-axial compressive stressed state, a formula for calculating the load-beating capacity of a high strength reinforced concrete shaft lining was obtained. Because the concrete in a shaft lining is in a multi-axial compressive stress state the compressive strength increases to a great extent compared to uni-axial loading. Based on experiment a formula for the gain factor in compressive strength was obtained： it can be used in the structural design of the shaft lining. These results have provided a basis for sound engineering practice when designing this kind of shaft lining structure.     

基于MapObjects的电子地图信息系统的设计与实现

利用MapObjects2.3在Visual C 6.0环境下开发是GIS开发的主要途径,介绍用MapObjects2.3在Visual C 6.0环境下开发的电子地图系统及其实现方法.     

ℋ︁∞ and l2–l∞ filtering for two‐dimensional linear parameter‐varying systems

In this paper, the ??_∞ and l₂–l_∞ filtering problem is investigated for two‐dimensional (2‐D) discrete‐time linear parameter‐varying (LPV) systems. Based on the well‐known Fornasini–Marchesini local state‐space (FMLSS) model, the mathematical model of 2‐D systems under consideration is established by incorporating the parameter‐varying phenomenon. The purpose of the problem addressed is to design full‐order ??_∞ and l₂–l_∞ filters such that the filtering error dynamics is asymptotic stable and the prescribed noise attenuation levels in ??_∞ and l₂–l_∞ senses can be achieved, respectively. Sufficient conditions are derived for existence of such filters in terms of parameterized linear matrix inequalities (PLMIs), and the corresponding filter synthesis problem is then transformed into a convex optimization problem that can be efficiently solved by using standard software packages. A simulation example is exploited to demonstrate the usefulness and effectiveness of the proposed design method. Copyright © 2007 John Wiley & Sons, Ltd.     

某型雷达模拟器PPI显示的设计与仿真

为了实现机载雷达训练模拟器人机交互界面,对雷达模拟器PPI显示进行设计.为了获取更逼真的实时显示,首先对雷达模拟器PPI显示的构成进行分析,设计字符显示模块和图形显示模块,然后介绍了模拟器中PPI显示的关键技术问题及解决途径,包括雷达点迹显示、杂波目标显示以及扇扫显示,采用颜色等级亮度不同来显示扫描更新的点迹,用具有某种特定概率密度和自相关函数产生随机数方法来近似仿真杂波目标显示.将改进方法应用于某型机载雷达训练模拟器中,取得了良好效果.     

Parameterized complexity of basic decision problems for tree automata

There are many decision problems in automata theory (including membership, emptiness, inclusion and universality problems) that are NP-hard for some classes of tree automata (TA). The study of their parameterized complexity allows us to find new bounds of their nonpolynomial time algorithmic behaviours. We present results of such a study for classical TA, rigid tree automata, TA with global equality and disequality and t-DAG automata. As parameters we consider the number of states, the cardinality of the signature, the size of the term or the t-dag and the size of the automaton.