随着互联技术的发展,人们的生活更加追求便捷、高效、自动化,针对人们的日常生活需求,本文提出了一种基于硬件平台为ARMA7的嵌入式linux智能家居系统设计的设计方案.该系统分为三个部分:基于ARM cortex-MO的数据采集端、基于A7的智能家庭网关、基于网页交互的客户端.该系统提出的系统设计通过ZigBee自组网络为连接桥梁实现ZigBee终端节点及家庭网关之间的通信,家庭网关以Linux为操作系统,移植BOA服务器,采用SQlite数据库存储信息,利用CGI程序设计实现与网页端通信,从而实现通过计算机和手机等智能设备监测居家环境参数和控制家电设备,方便了人们的日常生活需求.

本文设计并制作了一种基于晶体管放大器的非线性失真研究装置.本装置以频率为1kHz、峰峰值为20mV的正弦波作为晶体管放大器输入信号,输出峰峰值不低于2V的无明显失真波形及其余四种失真波形,并对输出波形进行AD采集后,通过FFT方式计算输出信号的总谐波失真值(Total Harmonic Distortion).本装置由STM32F407核心控制板、晶体管及偏置电路组成.通过改变五个通道的放大器偏置电路调节静态工作点,同时采用4051模拟开关进行五种波形通道的切换,实现"无明显失真"、"顶部失真"、"底部失真"、"双向失真"、"交越失真"五种波形输出,并在TFT LCD屏上显示波形以及THD值.

本文利用电容式传感器FDC2214设计制作了一个纸张计数器.待计数的纸张放置并被压紧于平行板电容器的两金属极板间,电容值随板间距(纸张厚度)变化,从而引起计数器前端谐振回路谐振频率变化.该传感器将感测到的谐振频率变化数字化,并送处理器进行中值平均滤波以降低噪声影响.系统将采样值与前期校准学习预存数据进行比对匹配,从而得到纸张计数值,并对计数结果进行液晶显示和语音播报输出.

TPMS is special equipment to examining the tire pressure and judging the leaking. It is the tendency that automobiles are equipped with the TPMS as well as ABS. The text introduces the circuit design and technique details of the TPMS. TPMS is distribution system which it includes one master module and lots of attachment modules. Every tire has low consumption attachment modules,which delivers messages such as the value of the tire pressure to the master module.

文章是基于电容式传感器FDC2214的嵌入式手势识别系统,该系统具有训练和判决两种模式,能对猜拳与划拳游戏的手势进行正确判别.通过电容式传感技术,可以设计不依赖于传统的视觉识别而且更准确更便携的手势识别系统,有望在未来体感游戏、智能家居等领域发挥重要作用.

This paper introduces the hardware composition of the intelligent alarm system based on wireless sensor and FPGA, explains the design principles, and puts forward the application field of this system and the development prospects. The design mainly consists of a household smoke monitoring instrument, a household gas monitoring instrument, a household infrared detector, and a GSM driving module. The household smoke monitoring instrument and gas monitoring instrument adopt the smoke concentration sensor monitoring MQ-2 to detect smoke and toxic gas to prevent fire and poisoning; The household infrared monitor uses HC-SR501 type infrared sensor to keep watch on invaders, and FPGA controller will deal with the alert signal received from the modules, and then drives GSM module to send messages in order to inform the user. After the actual test, the design can effectively prevent the occurrence of safety misadventures in the home.

探讨了自主学习的内涵,针对自主学习特性,以培养学生自觉性、能动性、自主性以及提高教学成效为目的,研究了基于项目实例为主线的任务驱动型教学方式,以分组学习为主导的学习方法,以过程监控、教学评价为核心的教学管理模式,构建了适合于VB程序设计的以教师为引导、学生为主体的自主学习教学模式。

数据对象是VHDL语言要素之一,常用的有常量、变量、信号三类。本文通过实例,阐述了VHDL中三类主要数据对象的概念、应用和注意点,以及它们间的相关区别,尤其是对信号和变量的相关延时特性加以了具体的描述分析。并通过QuartusII软件仿真验证了本文中相关描述分析的正确性。

In order to improve the real time of aircraft engine fault monitoring, it applies ant colony optimization (ACO) to select feature parameters of fault monitoring. To tackle the slow nature of ACO, an oppositional ant colony optimization (OACO) is presented in this paper. Utilizing the acceleration performance of opposition-based learning (OBL), it employs OBL for pheromone updating to accelerate the evolutionary process, improve the searching capability, and shorten the computing time. Also it has some merit including simpleness and easy implement. Through benchmark functions and monitoring parameter selection problem, it demonstrates that the proposed algorithm is effective and superior.

In order to improve the real time of aircraft engine fault diagnosis, particle swarm optimization (PSO) is applied to select feature parameters of fault monitor. To tackle the slow nature of PSO, an oppositional particle swarm optimization (OPSO) algorithm is presented in this paper. Utilizing the acceleration performance of opposition-based learning (OBL), it employs OBL for population initialization and also for generation updating to accelerate the evolutionary process, improve the searching capability, and shorten the computing time. Also it has some merits including simpleness and easy implement. Through the benchmark functions and feature parameters selection problem, it demonstrates that the proposed algorithm is effective and superior.

To enhance the quality for vehicle tracking,a robust H∞ filter algorithm under road situation is proposed in this paper.It notices that the running vehicles are constrained by the road network.Using the road network as filtering constraint condition,a dynamical system model with road constraint is built and the corresponding robust H∞ filtering equation is derived.The simulation results show that,the proposed algorithm has more tracking accuracy and better filtering performance than unconstrained H∞ filter and Kalman filter algorithm.

以应用性人才培养为目标，在现有普遍的教学方式基础上，首先转移教学地点、扩展教学时间，探索理论实践、课内课外一体化模式；其次改革教学方式，引入基础知识演示、重点知识点项目化、学习小组化、技术研发中心及教学资源电子化、网络化等方式，探索教学内容、教学方式多元化模式。最终融合形成多元化、一体式教学组织形式。实践表明，这一模式，有助提高学生的主观能动性，加强学生的实际动手能力和创新研究能力。