实验室管理系统的分析与实现

开发一个实验室管理系统对于依然比较传统的高校实验室的管理显得尤为重要。实验室管理系统采用先进的多层开发技术。软件应用模式采用B/S（浏览器／服务器）和C／S（客户端／服务器）相结合的混合结构模式,实验室内部（后台）管理采用C／S方式,而学生与后台的交互采用B／S方式。数据库系统以SQL2000作为开发平台,采用分布式数据库,在学校建立一个全校学生信息中心数据库。     

构建无线通信平台实现家电智能控制的关键技术研究

本文利用ZigBee具有的功率小、成本低、扩展容易和安装方便等优点,提出了一种利用ZigBee技术,构架一个较大范围的无线传感器网络方案,用于监测家庭内的各种信息,采集家电的信息,进行数据分析,以完成对家电进行实时监控的要求。重点介绍了基于S3C4510B芯片的无线网关的设计,以及无线传感器节点控制模块MSP430和通讯模块CC2420的开发。     

基于S3C44B0X的U-Boot及μClinux的移植分析

选取了当前比较流行、功能强大的引导程序U-Boot及专门应用于无MMU微处理器的μClinux操作系统,深入研究了U-Boot及μClinux的移植方法.以UP-NETARM3000开发板为例,详细分析其特殊功能寄存器设置及移植过程,创建了基于S3C44B0X的ARM-μClinux开发平台.在嵌入式系统的开发调试阶段,充分利用U-Boot网络引导方式大大提高了开发效率,为基于μClinux进行各种设备驱动程序的开发提供了便利.用文中方法移植的U-Boot及μClinux已稳定运行在UP-NETARM3000开发板上,为后续的嵌入式产品开发打下坚实的基础.     

超声波测距在汽车停车泊位中的应用

本系统的硬件基于ARM7,软件基于μC／OS—Ⅱ实时多任务操作系统。本文介绍了以ARM7为控制核心的超声波汽车停车泊位检测报警系统,重点分析了超声波测距的原理、超声波收发器与ARM7的连接与实现以及系统的软件流程设计。该系统在汽车电子方面有一定的实用价值。     

Controller synthesis with guaranteed closed-loop phase constraints

In this paper, we present an analysis and synthesis approach for guaranteeing that the phase of a single-input, single-output closed-loop transfer function is contained in the interval [−α,α] for a given α>0 at all frequencies. Specifically, we first derive a sufficient condition involving a frequency domain inequality for guaranteeing a given phase constraint. Next, we use the Kalman–Yakubovich–Popov theorem to derive an equivalent time domain condition. In the case where , we show that frequency and time domain sufficient conditions specialize to the positivity theorem. Furthermore, using linear matrix inequalities, we develop a controller synthesis approach for guaranteeing a phase constraint on the closed-loop transfer function. Finally, we extend this synthesis approach to address mixed gain and phase constraints on the closed-loop transfer function.     

Controller certification

A modern problem from aerospace control involves the certification of a large set of potential controllers with either a single plant or a fleet of potential plant systems, with both plants and controllers being MIMO and, for the moment, linear. Experiments on a limited number of controller/plant pairs should establish the stability and a certain level of margin of the complete set. We consider this certification problem for a set of controllers and provide algorithms for selecting an efficient subset for testing. This is done for a finite set of candidate controllers and, at least for SISO plants, for compact infinite set. In doing this, the ν-gap metric will be the main tool. Computational examples are given, including one of certification of an aircraft engine controller. The overarching aim is to introduce truly MIMO margin calculations and to understand their efficacy in certifying stability over a set of controllers and in replacing legacy single-loop gain and phase margin calculations.     

A -based optimal finite-word-length controller design

A novel optimal Finite Word Length (FWL) controller design is proposed in the framework of μ theory. A computationally tractable close-loop stability measure with FWL implementation considerations of the controller is derived based on the μ theory, and the optimal FWL controller realizations are obtained by solving the resulting optimal FWL realization problem using linear matrix inequality techniques.     

基于ARM的远程数据采集系统

介绍了一种远程数据采集系统的设计方案,该系统采用了S3C44BOX作为数据采集终端的微处理器,通过以太网实现了数据采集终端与客户端程序间的通讯.该远程数据采集系统具有可靠性高,实时性强,传输速度快等优点.     

供热自动控制中的室温采集电话的设计与实现

应用于供暖自动控制中的室温采集电话除了具有普通电话机的功能外还具有采集室温的功能.室温采集电话通过公共电话网络,接收到室温采集基站的请求后将温度上传至PC机,构成远程温度采集系统.本文基于普通电话的通话电路用HT95C30P微控制器和温度芯片LM92设计和实现室温采集电话.     

基于AT89C51单片机的交通灯系统设计

以单片机AT89C51作为城市交通灯的控制核心,模拟定周期交通信号灯的工作状态;针对复杂多变的路况环境,特别增设了路段遇忙调整、紧急情况处理、特种车检测、语音提示等模块,进一步完善了交通灯控制系统。