基于μC/OS-Ⅱ的便携式心电分析仪设计及QRS检测算法分析

利用C8051F040单片机设计数据采集模块,设计一款便携式、低功耗、具有QRS波群分析功能的心电分析仪.将基于μC/OS-Ⅱ的QRS波群检测算法植入ARM微处理器,该算法的CPU使用率仅为1%,再通过对ARM微处理器电源的控制,达到了降低系统功耗、实时性分析的目的.     

“龙腾R2”微处理器数据cache的设计与实现

集成电路制造工艺的迅猛发展为设计高性能微处理器系统打下基础,自主研发高性能微处理器在我国具有很重要的意义.在微处理器的体系结构设计中,"存储墙"问题是很多设计者将面对的难题.以前的研究证明了片上cache是解决处理器与主存储器之间的速度差异的有效措施之一,是片内存储系统中最关键的部分.因而,设计与系统相匹配的cache对于处理器整体性能的提升有很大的帮助.针对航空应用领域,西北工业大学航空微电子中心自主研发设计了32位嵌入式RISC微处理器"龙腾R2",考虑到其应用特性,提出了一种支持多机系统的数据cache的设计方案;讨论了其RAM组织结构、高速缓存一致性、监听协议等.介绍了具体设计实现,包括控制通路和数据通路的设计;并且提出了优化的设计方法,保证了数据cache的低功耗.目前芯片已经成功流片,采用CMOS 0.18 μm工艺实现,芯片面积为4.8×5.2 mm2,主频达到233 MHz.     

流水线模数转换器的一种数字校准技术

为了降低流水线模数转换器中数字校准电路的规模和功耗,提出了一种新的基于信号统计规律的后台数字校准技术.该技术采用自适应搜索算法和二元单调函数的幅值增量比较算法,分别对基于信号统计规律的数字校准技术中的距离估计电路和查找表进行优化设计,减少了距离估计所需的数字电路和查找表所需的ROM空间,极大地降低了数字电路的规模和功耗.应用该校准技术实现了一个12位、采样率为4×107 s-1的流水线模数转换器.测试结果表明,同优化前相比,该芯片数字电路的功耗降低了931%,所需ROM空间减小了95%.整个芯片采用SMIC 0.18μm CMOS工艺设计,总功耗为210 mW,芯片面积为3.3 mm×3.7 mm.     

应用于32位嵌入式系统的中断控制IP的裁减设计

C＊Core是32位RISC嵌入式微处理器核．对应用于C＊Core的中断控制IP核进行了裁减和验证，分析了与C＊Core的兼容性，并应用于变频器控制SoC的设计中．新的设计减少了使用的晶体管数量，降低了功耗及成本．     

低功耗微型胶囊内窥镜图像采集系统设计

为实现在消化道疾病检查时延长胶囊内窥镜的可工作时长,研究并设计了一种具有五维磁定位功能的基于OV2640及STM32系列低功耗MCU的胶囊内窥镜无线图像采集传输系统。该系统由胶囊内窥镜本体和体外图像接收端组成,硬件上选取低功耗的MCU为STM32L4R5及低功耗射频收发芯片nRF24L01和CMOS图像传感器OV2640。同时针对功耗较大的闪光拍照、无线收发部分进行了软件设计。该系统直径为12 mm、长度24 mm,每秒传输图片2帧,最大稳定通讯距离2 m,定位精度1. 37 mm,定向精度为3. 39°。实验表明:该系统可获取压缩后传送的清晰图像,测试功耗为99 m W,降功耗后延长了可工作时长,满足了胶囊内窥镜图像采集系统低功耗实时图像采集传输的要求。     

基于ARM的嵌入式系统教学平台的设计与实现

基于ARM的嵌入式系统教学平台的设计与实现以低功耗、低成本、高性价比的32位RISC ARM7TDMI系列嵌入式微处理器S3C44B0为核心,设计嵌入式系统教学实践硬件平台,包括硬件电路原理图设计和PCB板图设计,使用免费开源的Linux作为操作系统完成uclinux在教学实践硬件平台上面的移植,并为嵌入式系统教学实践平台配套设计一个综合应用实验.     

基于冗余算法和跳跃式结构的54位乘法器的研究

为了提高乘法器的综合性能,提出了一种新的冗余Booth三阶算法和跳跃式Wallace树结构,前者可以减少部分积的数目,提高部分积的产生速度,后者可以加快部分积的压缩,减少电路内部的伪翻转,从而降低功耗.基于冗余Booth三阶算法和跳跃式Wallace树结构,采用0.25μmCMOS工艺,实现了54×54位全定制乘法器,其乘法延时为4.3 ns,芯片面积为1.38 mm2,50MHz频率下的动态功耗仅为47.2 mW.模拟验证表明,与采用传统Wallace树结构和改进Booth二阶算法的乘法器相比,该乘法器的乘法延时减少了23%,功耗降低了17%,面积减少了20%.     

一种基于分段电容的低功耗SARADC设计

针对当前物联网技术对功耗的严格要求,设计了一种基于分段电容的低功耗SAR ADC电路.电路通过使用分离电容阵列来降低整个CDAC所需要的单位电容数和ADC的功耗.同时采用了分离电容校正技术来降低整体CDAC的非线性和失调校正技术来降低比较器电路的失调.在0.18,mm CMOS工艺下完成了一款10-bit 10-Msample/s的电路原型设计及相应的版图设计和验证工作,带有PAD的芯片整体面积为1,2mm.芯片后仿真结果表明:该转换器在校正情况下,4.89,MHz输入信号频率下信号噪声谐波比(SFDR)为61.43,dB,比不校正提高了54%,;有效位数达到9.90,bit,比不校正提高了3.7,bit;在1.8,V电源电压下功耗仅为255.61,mW.     

手机式遥控智能脉搏仪

本系统的设计基于台湾义统嵌入式微处理器(ET44M210)芯片及配套仿真软件开发系统。这是一款低功耗,高性能,具有RISC架构的8位微控制器,其在通信、控制等方面的优越性能,使手机式遥控智能脉搏仪系统的研制实现成为可能。     

嵌入式低功耗8位微控制器的设计

设计实现了一款嵌入式低功耗8位微控制器,采用了类精减指令集计算机(RISC)指令集、哈佛双总线体系和两级四段流水线结构.重点研究了微控制器的功耗分布,并从系统级、寄存器传输级(RTL)和逻辑级进行了功耗的优化.基于Chartered 0.35,μm CMOS Logic工艺进行了后端设计并流片,测试结果表明其工作频率可达80,MHz3,2,kHz下工作电流为6.75,μA.该微控制器已作为核心控制单元应用于无磁流量计量SoC芯片中,用于完成数据处理和调度工作.     

Markedness and its Interpretation in Language Use

Language markedness is a common phenomenon in languages, and is reflected from hearing, vision and sense, i.e. the variation in the three aspects such as phonology, morphology and semantics. This paper focuses on the interpretation of markedness in language use following the three perspectives, i.e. pragmatic interpretation, psychological interpretation and cognitive interpretation, with an aim to define the function of markedness.     

低渗透非均质砂岩油藏启动压力梯度研究

理论推导与室内实验相结合,建立了低渗透非均质砂岩油藏启动压力梯度确定方法。首先借助油藏流场与电场相似的原理,推导了非均质砂岩油藏启动压力梯度计算公式。其次基于稳定流实验方法,建立了非均质砂岩油藏启动压力梯度测试方法。结果表明:低渗透非均质砂岩油藏的启动压力梯度确定遵循两个等效原则。平面非均质油藏的启动压力梯度等于各级渗透率段的启动压力梯度关于长度的加权平均;纵向非均质油藏的启动压力梯度等于各渗透率层的启动压力梯度关于渗透率与渗流面积乘积的加权平均。研究成果可用于有效指导低渗透非均质砂岩油藏的合理井距确定,促进该类油藏的高效开发。     

On Tragic Consciousness In The Works By Ernest Hemingway

As an American modern novelist who were famous in the literary world, Hemingway was not a person who always followed the trend but a sharp observer. At the same time, he was a tragedy maestro, he paid great attention on existence, fate and end-result. The dramatis personae's tragedy of his works was an extreme limit by all means tragedy on the meaning of fearless challenge that failed. The beauty of tragedy was not produced on the destruction of life, but now this kind of value was in the impact activity. They performed for the reader about the tragedy on challenging for the limit and the death.     

Achieving Unusual States of Matter Under High Pressure

正The periodicity of the elements and the non-reactivity of the inner-shell electrons are two related principles of chemistry,rooted in the atomic shell structure.Within compounds,Group I elements,for example,invariably assume the+1 oxidation state,and their chemical properties differ completely from those of the p-block elements.These general rules govern our understanding of chemical structures and reactions.Using first principles calcula-     

Exchange-Correlation and Electronic Excitation Energies from Pairing Matrix Fluctuations

We have developed an adiabatic connection to formulate the ground-state exchange-correlation energy in terms of pairing matrix linear fluctuations.This formulation of the exchange-correlation energy opens a new channel for density functional approximations based on the many-body perturbation theory.We illustrate the potential of such approaches with an approximation based on the particle-particle Random Phase Approximation(pp-RPA).This re-     

Density Functional Theory for the Response of Periodic Systems to Electric Fields Based on the Vector Potential Approach

正The electronic and nuclear(structural/vibrational)response of 1D-3D nanoscale systems to electric fields gives rise to a host of optical,mechanical,spectral,etc.properties that are of high theoretical and applied interest.Due to the computational difficulty of treating such large systems it is convenient to model them as infinite and periodic(at least,in first approximation).The fundamental theoretical/computational problem in doing so is that     

On the Thermodynamic Limit for Responses to Static Electromagnetic Fields

For molecular systems,the quantum-mechanical treatment of their responses to static electromagnetic fields usually employs a scalar-potential treatment of the electric field and a vector-potential treatment of the magnetic field.Although the potential for each field separately is associated with the choice of an(unphysical)origin,the precise choice of the origin for the electrostatic field has little consequences for the results.This is different for the     

An affordable accurate evaluation of the binding conformations predicted by molecular docking studies in bio-system

Franck-Condon factors bridge the gap between theoretical modeling and experimental observations for molecular electronic spectroscopy and electron transfer.Under the displaced harmonic oscillator approximation,multidimensional Franck-Condon factors are decomposed into a product of many one-dimensional(1D)Franck-Condon(FC)factors,and each 1D-FC factor is associated with one Huang-Rhys factor that determines the leading contribution of     

Call for Papers

<正>"The Journal of Shanghai Normal University:Mathematics"is published by Shanghai Normal University as regular issues of The Journal of Shanghai Normal University each year from 2014 in English.The editors-in-chief of the issues are professors Yuhao Cong and Maoan Han.The Journal of Shanghai Normal University was started in 1958 with     

Journal of Donghua University ( English Edition) Contents of Volume 31

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