NAND Flash内存设备的读写控制设计

针对NAND Flash闪存设备在嵌入式系统中的应用,详细分析了Flash闪存设备的接口设计方法。根据NANDFlash的读写特性,采用Hynix半导体公司的Flash H27U1G8F2B,设计一种闪存数据读写控制方法和驱动流程。该方法能够应用于各种NAND Flash的读写控制,具有良好的程序结构和较高的代码运行效率。     

在CFIFLASH设备上实现JFFS2文件系统

本文首先介绍了JFFS2,FLASH和MTD的相关知识。之后详细介绍了如何利用MTD技术在flash上实现JFFs2文件系统。包括驱动程序编写,内核修改和配置,根文件系统的建立。最终使得JFFS2文件系统可以稳定、可靠地运行在ARM920开发板上。同时也指出了JFFS2的局限性和发展趋势。     

A survey: When moving target defense meets game theory

Moving target defense (MTD) can break through asymmetry between attackers and defenders. To improve the effectiveness of cybersecurity defense techniques, defense requires not only advanced and practical defense technologies but effective, scientific decision-making methods. Due to complex attacker–defender interaction, autonomous, automatic, accurate, and effective selection of the optimal strategy is a challenging topic in the field of MTD. The essence of cybersecurity lies in the interaction between the attacker and defender. Game theory is a useful mathematical tool for strategy selection in a competitive environment. It provides strong theoretical support for the analysis of cyberattack and defense behaviors and subsequent decision-making, and can significantly improve the decision-making ability of MTD. This study presents the basic concepts of MTD and game theory, followed by a literature review, to study MTD decision-making methods based on game theory from the dimensions of space, time, space–time, and bounded rationality. Limitations of MTD game decision-making studies are discussed, as well as research directions, to provide references for future research.     

嵌入式Linux下的FRAM驱动程序设计

针对铁电存储器(FRAM)在基于ARM9的嵌入式Linux系统下设备节点的读写及应用问题,研究Linux系统的驱动设计,分析FRAM的工作原理和硬件特性,提出基于Linux系统标准驱动架构与铁电底层预处理、读写、控制等工作机制相结合的FRAM驱动程序设计与实现流程。底层实现采用内核级基于FRAM的寻址方式,结果证明了该驱动在相应数据存储、传输中的可行性与稳定性。     

地面探测脉冲压缩雷达的动目标检测

介绍了基于脉冲压缩体制的地面探测雷达动目标检测的数字信号处理流程,阐述了动目标检测原理,讨论了雷达回波的函数表达式,并利用计算机进行了雷达回波仿真,在复杂的环境背景下顺利地完成了对动目标的检测。     

Dendrimer as nanocarrier for drug delivery

Dendrimers are novel three dimensional, hyperbranched globular nanopolymeric architectures. Attractive features like nanoscopic size, narrow polydispersity index, excellent control over molecular structure, availability of multiple functional groups at the periphery and cavities in the interior distinguish them amongst the available polymers. Applications of dendrimers in a large variety of fields have been explored. Drug delivery scientists are especially enthusiastic about possible utility of dendrimers as drug delivery tool. Terminal functionalities provide a platform for conjugation of the drug and targeting moieties. In addition, these peripheral functional groups can be employed to tailor-make the properties of dendrimers, enhancing their versatility. The present review highlights the contribution of dendrimers in the field of nanotechnology with intent to aid the researchers in exploring dendrimers in the field of drug delivery.     

嵌入式Linux系统下闪存设备驱动程序设计

嵌入式系统通常使用闪存作为存储设备,通过MTD技术可以方便地访问flash这样的MTD设备。本文中介绍了Linux驱动程序框架,详细分析了MTD设备驱动程序的层次结构和数据结构,以EBD9315开发板为例,系统地给出了如何针对Nor flash设计MTD驱动程序。     

一种优化设计的动目标检测方法及其运用

提出一种新的动目标检测(MTD)滤波器组设计方法,即通过设置目标处理通道和气象处理通道,其中目标通道采用自适应动目标检测(AMTD)处理方式,实时检测杂波的存在,根据杂波的强弱自动产生或选择滤波器加权因子,以保证对地杂波抑制的同时,减少信噪比损失,提高对弱小目标的检测性能.通过仿真结果,证明该方法是有效的,在工程上有一定的实用价值.     

超宽带穿墙雷达动目标跟踪成像算法研究

利用超宽带穿墙雷达探测跟踪墙后人体目标在城区巷战、反恐斗争和人质救援等领域的应用日益广泛。动目标检测与成像算法是穿墙雷达信号处理的两大关键部分,针对传统的动目标检测方法的不足,本文研究了一种提取动目标回波信息的自适应背景去除方法,并考虑到墙体影响,对传统的后向投影成像算法进行改进。利用FDTD数值仿真和外场实验验证了对隐藏在墙后运动目标跟踪成像,研究结果表明,本文算法对天线形式要求简单,准确度高,实时性好。     

一种基于分数阶Fourier变换的雷达运动目标检测算法

针对雷达回波为多分量LFM信号时,时频分析存在的交叉项干扰问题,提出了一种基于分数阶Fourier变换(Fractional Fourier Transform,FRFT)的伪Wigner分布(PWD).该方法通过在参数平面按阈值进行峰值搜索确定变换域阶次,再在相应的分数阶Fourier域计算PWD,有效地抑制了交叉项的干扰,有利于更好地提取信号的时频信息.仿真实验证明了在强背景噪声下该算法的有效性.