S3C44BOX微处理器在汽车防抱死控制系统中的应用

采用8位及16位微处理器已经在很多场合下不能满足我们的性能需求．尤其汽车的制动系统的实时性要求，使得采用能够充分并且合理利用CPU的高性能32位微处理器和实时操作系统成为了设计汽车电控单元的趋势。本文从硬件和软件两个方面描述了采用S3C44BOX和μC／OS-Ⅱ开发防抱死电控单元的方法和过程。     

VC下实现基于Modbus协议的DCS与远程I/O系统通信

本文在分析Modbus协议及其通信原理的基础上，结合工程实际，提出了一种在工业PC机上实现串行通信的方法，并在Visual C 6．0环境下开发了通信的应用程序，实现了基于Modbus协议的DCS与远程I／O系统通信。     

Stability analysis and design of T-S fuzzy control system with simplified linear rule consequent.

Stability and design issues of simple T-S fuzzy control system with simplified linear rule consequent (TSS) are investigated. A systematic approach to find a common matrix P for TSS fuzzy system is presented, where system matrix Ai is decomposed into proportional part Ai and the remainder delta Ai. Hence an iterative approach to find a common matrix P for pairwise commutative Ai's can be used. The stability of the global system is guaranteed if delta Ai satisfies certain conditions. Qualitative instructions for TSS control system design are summarized. A physical example is given to illustrate the issues discussed throughout the paper.     

Providing adaptive QoS to layered video over wireless local area networks through real-time retry limit adaptation

Robust streaming of video over 802.11 wireless LANs (WLANs) poses many challenges, including coping with packets losses caused by network buffer overflow or link erasures. In this paper, we propose a novel error protection method that can provide adaptive quality-of-service (QoS) to layered coded video by utilizing priority queueing at the network layer and retry-limit adaptation at the link layer. The design of our method is motivated by the observation that the retry limit settings of the MAC layer can be optimized in such a way that the overall packet losses that are caused by either link erasure or buffer overflow are minimized. We developed a real-time retry limit adaptation algorithm to trace the optimal retry limit for both the single-queue (or single-layer) and multiqueue (or multilayer) cases. The video layers are unequally protected over the wireless link by the MAC with different retry limits. In our proposed transmission framework, these retry limits are dynamically adapted depending on the wireless channel conditions and traffic characteristics. Furthermore, the proposed priority queueing discipline is enhanced with packet filtering and purging functionalities that can significantly save bandwidth by discarding obsolete or un-decodable packets from the buffer. Simulations show that the proposed cross-layer protection mechanism can significantly improve the received video quality.     

关于水电开发特许权经营的探讨

在介绍资源开发特许权经营的国际经验的基础上，分析了我国实施水电资源开发特许权经营和必要性和可行性，认为实施水电资源开发特许权经营是市场经济发展的必然要求，是加快发展水电的需要，是水电发展的制度创新，它体现了公开、公正、公平的原则，有利于提高资源配置的效率。     

提高碾压混凝土抗裂性能的试验研究

本文通过抗裂试验研究、抗裂机理及多方面资料的综合分析 ,提出碾压混凝土的抗裂参数Φ作为评价碾压混凝土抗裂性能的指标。在此基础上 ,我们对混凝土抗裂性能的时间效应进行了深入研究 ,得出碾压混凝土的抗裂性能随时间变化的规律。最后为了提高碾压混凝土的抗裂性能 ,提出碾压混凝土的抗裂机理 ,这对工程实践具有指导意义     

关于李家峡水电厂400MW发电机中性点接地方式和接地保护的分析

文章主要针对李家峡水力发电厂发电机定子绕组中性点的接地方式,分析这种接地方式的特点,并结合定子一点接地保护,提出保护存在的问题,并予以计算分析,经改进定子接地保护后,有利于机组和系统的稳定运行.     

高压电动机过热保护整定计算研究

通过对高压电动机起动过程中电气参数变化的研究,提出高压电动机过热保护的整定计算方法.     

双机架可逆冷轧机张力控制系统的研究

文章针对双机架可逆冷轧机的特点和轧制工艺要求,采用间接张力与直接张力复合控制法以实现卷取恒张力控制;提出了机架间张力控制系统的组成,描述了两种调张法的控制原理与实现方法.     

程控高压脉冲系统自动控制功能的实现

本文简介了程控高压脉冲系统的结构与功能,主要从软件设计开发方面介绍程控高压脉冲系统自动控制功能的实现,并对在软件开发过程中的关键技术进行了探讨.