一种电液伺服系统中伺服控制器的设计与应用

文章设计了一种采用双DSP结构的伺服控制器，介绍了其组成结构、功能以及在电液伺服系统控制中的应用。将DSP芯片和数字信号处理技术结合，采用模糊算法设计以及同步协调设计，完成对原有单一通道、非同步的电液伺服系统扩充。多通道多变量大容量协调同步控制的复杂电液伺服系统具有强大的数据采集能力，64通道动态数据采集，320通道静态数据采集，完全满足大型结构试验的需要。     

A motion-tolerant dissolve detection algorithm

Gradual shot change detection is one of the most important research issues in the field of video indexing/retrieval. Among the numerous types of gradual transitions, the dissolve-type gradual transition is considered the most common one, but it is also the most difficult one to detect. In most of the existing dissolve detection algorithms, the false/miss detection problem caused by motion is very serious. In this paper, we present a novel dissolve-type transition detection algorithm that can correctly distinguish dissolves from disturbance caused by motion. We carefully model a dissolve based on its nature and then use the model to filter out possible confusion caused by the effect of motion. Experimental results show that the proposed algorithm is indeed powerful.     

An Embedded Internet interface system

This article has introduced a method to connect the embedded system with Internet, and given a circuit of embedded system connect.     

Generalized Stewart-Gough platforms and their direct kinematics

In this paper, we introduce the generalized Stewart-Gough platform (GSP) consisting of two rigid bodies connected with six distance and/or angular constraints between six pairs of points, lines, and/or planes in the base and the moving platform, respectively. We prove that there exist 3850 possible forms of GSPs. We give the upper bounds for the number of solutions of the direct kinematics for all the GSPs. We also obtain closed-form solutions and the best upper bounds of real solutions of the direct kinematics for a class of 1120 GSPs.     

安全用户平面AGPS移动定位平台设计与实现

安全用户平面辅助性GPS(AGPS:Assist-Global Position System)移动定位平台以其定位精度高、部署成本低等特点而受到运营商的高度重视.开放移动联盟(OMA)相关规范制定了平台的系统结构,但未解决如何判定移动终端是否漫游以及如何判定移动终端是否支持相关定位协议等问题.在分析平台系统结构的基础上给出了解决上述问题的方法,并提出了组件式的平台软件结构,详细设计了核心进程的软件架构,描述了基于该结构的平台中定位请求消息的处理流程.     

大功率变频器在抓斗行车上的应用

本文介绍了艾默生大功率TD3000变频器在抓斗行车的运用。抓斗行车变频改造后，很好地解决了主／闭钢丝绳受力平衡问题，软启软停方式大大降低了起制动时的冲击电流，再加上变频器本身具有完善灵敏保护功能，极大地提高了行车运行的可靠性，延长了系统的使用寿命。     

职务犯罪概念及其成因的法律文化学初探

职务犯罪成因的分析有助于职务犯罪的预防，近年来我国正处于社会转型时期，职务犯罪较为猖獗，本文从法律文化的角度出发，探讨了职务犯罪的概念覆其成因，以期在前人研究的基础上，进一步丰富职务犯罪成因探讨的成果，为我国职务犯罪控制提供法律文化学的对策。     

Modeling of Magneto-Rheological Damper with Neural Network

With the revival of magnetorheological technology research in the 1980＇s, its application in vehicles is increasingly focused on vibration suppression. Based on the importance of magnetorheological damper modeling, nonparametric modeling with neural network, which is a promising development in semi-active online control of vehicles with MR suspension, has been carried out in this study. A two layer neural network with 7 neurons in a hidden layer and 3 inputs and 1 output was established to simulate the behavior of MR damper at different excitation currents. In the neural network modeling, the damping force is a function of displacement, velocity and the applied current. A MR damper for vehicles is fabricated and tested by MTS; the data acquired are utilized for neural network training and validation. The application and validation show that the predicted forces of the neural network match well with the forces tested with a small variance, which demonstrates the effectiveness and precision of neural network modeling.     

Synthesis, Structure and Characterization of Y-Al-Cr Red Pigment

Synthesis, Structure and Characterization of Y-Al-Cr Red Pigment     

Stability analysis and H/sub /spl infin// controller design of fuzzy large-scale systems based on piecewise Lyapunov functions

This paper presents a novel approach to stability analysis of a fuzzy large-scale system in which the system is composed of a number of Takagi-Sugeno (T-S) fuzzy subsystems with interconnections. The stability analysis is based on Lyapunov functions that are continuous and piecewise quadratic. It is shown that the stability of the fuzzy large-scale systems can be established if a piecewise Lyapunov function can be constructed, and, moreover, the function can be obtained by solving a set of linear matrix inequalities (LMIs) that are numerically feasible. It is also demonstrated via a numerical example that the stability result based on the piecewise quadratic Lyapunov functions is less conservative than that based on the common quadratic Lyapunov functions. The H/sub /spl infin// controllers can also be designed by solving a set of LMIs based on these powerful piecewise quadratic Lyapunov functions.