钛酸钡添加量对埋容用环氧-钛酸钡-玻璃布板材性能的影响

采用热固化层压方法制备了环氧-钛酸钡-玻璃布(EBG)板材,并分析钛酸钡(BTO)添加量对埋容用EBG板材各项性能的影响。结果表明:随着BTO填料添加量的增大,EBG板材的实际密度先接近后偏离理论密度,孔隙率先减小后增大,耐浸焊时间、剥离强度先增大后减小,5%热分解温度和介电常数增大;当BTO的质量分数为80%左右时,埋容用EBG板材具有较好的综合性能;EBG板材为一种混联模型。     

基于海洋背景红外图像的仿真系统研究

简要介绍了一种简便的基于海洋背景的红外仿真系统的设计和组成,阐述了各个模块的功能以及模块之间的联系。在实际存储红外图像素材基础上,通过直接添加模板图像,接着通过后续的处理模块来实现较好的模拟海洋红外图像中的目标的目的。从最后的结果可以看到这是一个简便有效的仿真系统。     

BF518嵌入式处理器的串口扩展及驱动程序设计

ADI公司Blackfin系列BF518处理器,采用uClinux作为嵌入式操作系统有着很大的优势和发展前景,而在uClinux下进行外围设备扩展的设备驱动程序开发又是系统开发的一个重点,该文结合16C2552串口扩展对linux下设备驱动程序开发作了详细的介绍。     

iCETD: An improved tag generation design for memory data authentication in embedded processor systems

Security becomes increasingly important in computing systems. Data integrity is of utmost importance. One way to protect data integrity is attaching an identifying tag to individual data. The authenticity of the data can then be checked against its tag. If the data is altered by the adversary, the related tag becomes invalid and the attack will be detected. The work presented in this paper studies an existing tag design (CETD) for authenticating memory data in embedded processor systems, where data that are stored in the memory or transferred over the bus can be tampered. Compared to other designs, this design offers the flexibility of trading-off between the implementation cost and tag size (hence the level of security); the design is cost effective and can counter the data integrity attack with random values (namely the fake values used to replace the valid data in the attack are random). However, we find that the design is vulnerable when the fake data is not randomly selected. For some data, their tags are not distributed over the full tag value space but rather limited to a much reduced set of values. When those values were chosen as the fake value, the data alteration would likely go undetected. In this article, we analytically investigate this problem and propose a low cost enhancement to ensure the full-range distribution of tag values for each data, hence effectively removing the vulnerability of the original design.     

Multiple material domain‐based computational tools for ease assessment of modal parameter in photonic crystal fibers

We report here the development of two computational tools PCFPS (Photonic Crystal Fiber Parameter Study) and PCFPA (Photonic Crystal Fiber Parameter Analysis), equipped with graphical user interface (GUI) for modeling of photonic crystal fiber. The tools are based on different structural parameters, and they provide characteristic analysis of the modal parameters from the structural parameters. The main feature of PCFPS is that it enables the user to find out the values of each defining modal parameter that has an immense contribution towards the manufacture of photonic crystal fiber. Additionally, PCFPA allows the user to observe the variation in the modal parameters with respect to the changes in structural parameters (such as d, Λ, d/Λ, and λ/>Λ). Besides their ease of use, these two schemes have high computational precision and adaptability, giving a novel platform to optical engineers to modulate the microstructured fibers according to their requirement.     

基于用户偏好的嵌入性网络结构分析

嵌入性是社会网络分析的核心思想,现有的互联网结构研究抛开理论思想只借用社会网络分析方法,不利于从深层次上理解和挖掘用户行为与网络结构之间的关系.本文针对二元关系框架分析互联网深层结构的局限性,构建了基于用户偏好的网络行为分析框架,提出了嵌入性网络结构的观点,分析了用户行为与其所处的互联网及现实社会关系网络之间的双重嵌入关系.从关系性嵌入和结构性嵌入两个维度给出了一系列测度指标和分析方法,为分析互联网深层次的网络结构提供了新的研究思路.     

基于FPGA的嵌入式以太网与Matlab通信系统的设计

随着FPGA单片可编程容量的日益增大,传统的嵌入式系统设计正在逐渐被片上系统所取代,用于数据通信的以太网片上系统设计也越来越备受关注,另外,通信数据采集的可视化及数据处理的简单化要求也越来越明显,基于这两方面,本文简要介绍了如何利用Xilinx公司的MicroBlaze微处理器软核,以及相应的嵌入式操作系统Xilkernel和Lwip协议功能函数,采用片上系统设计理念,来设计完成基于FPGA的嵌入式以太网与Matlab通信平台的数据传送交互系统。     

3G智能机器人的研究

随着3G通讯技术、物联网技术、机电控制技术、多媒体技术的日趋成熟,基于相关技术的产品也备受消费者的欢迎.本文结合当前机器人技术和嵌入式技术的融合发展方向,提出了一种基于ARM9与3G网络相结合的智能机器人,给出了系统结构设计,硬件模块设计,软件设计等.     

基于ARM的虹膜图像采集系统

文章以S3C2440开发板为硬件平台,构建了一个基于ARM9处理器的虹膜图像采集系统,并分析了如何在该平台上实现虹膜采集。同时阐述了系统的硬件架构和接口设计,提出了基于V4L标准的摄像头接口设备驱动程序框架,并详细介绍了视频采集程序的具体实现过程,进而提出了一种可行的嵌入式实时图像采集驱动设计方案。实际使用结果表明,本设计方案能充分满足便携式虹膜采集设备的需求。     

基于嵌入式系统的双屏兼容显示设计

提出了一种基于嵌入式系统的双屏兼容显示设计方案.以一款单色STN-LCD、一款TFT-LCD和LPC2478芯片为例进行了介绍,完成了两款液晶显示屏与LPC2478硬件接口电路的设计,并详细阐述了双屏兼容下GUI程序设计的总体框架以及编程的一些细节.最后对设计进行测试和分析,结果表明此方法可以完整显示相关信息,并具有一...