基于ATMEGA128的超声波倒车雷达的设计

本文针对车辆碰撞追尾事故,给出了汽车倒车雷达系统的软、硬件以及实时超声测距的原理与实现过程。该系统以AT-MEGA128作为核心处理器,实现了汽车倒车雷达系统的超声波测距。     

汽车防追尾碰撞系统的研制

研制了一种自动控制的汽车防追尾碰撞系统。汽车正常行驶时,该系统处于非工作状态,当后车车头非常接近前车车尾时,该系统将发出防追尾警告,在发出警告后,如果驾驶员没有采取制动减速措施,该系统便启动紧急制动装置,以避免发生追尾事故。汽车防追尾碰撞系统具体组成如下:(1)行车环境监测系统由测量车间距离和前面车辆方位的激光扫描雷达及能够判定路面状态的道路传感器所组成。通过发出脉冲激光对前方道路状况进行监测,并能监测弯道上的障碍物。最小的激光扫描雷达监测范围为120ｍ。(2)防追尾碰撞判断分为两步:①从激光扫描雷达所测的距离及…     

适用于汽车追尾归避的传感检测技术

汽车追尾是高速公路典型而严重的交通事故 ,而利用激光技术和雷达技术可以检测汽车间距 ,确保安全距离 ,还可以避免发生汽车追尾事故的技术方案 :既可以降低汽车追尾发生的可能性 ,又可以明显减少行车安全距离 ,从而显著提高高速公路交通流量     

交通事故分析定性推理方法

定性推理是人工智能研究的新领域,广泛用于物理过程的解释。文章首先简述了定性推 理的基本原理,然后利用QSIM算法进行了汽车追尾过程的定性推理,最后指出应用模式匹配的 方法可以断定某一具体汽车追尾交通事故的原因。     

一种基于AT89S52的车辆防追尾预警系统设计

在汽车防撞模型的基础上分析了汽车的制动过程,并设计了一种基于AT89S52的车辆防追尾预警系统。当检测到前方车辆在行驶中对本车构成危险时,声光预警模块开始工作,及时提示驾驶员采取制动等相应措施避免车辆追尾。实验表明,该系统可以根据实测距离和自车车速,准确地判断出安全制动距离并给出预警界限。     

基于CAN总线的无人车车载无线传输终端设计

针对无人驾驶汽车运行状态的监控问题,设计了以CAN总线和嵌入式技术为核心的车辆参数数据采集和远程监控系统,基于核心处理器STM32F107搭建了终端的硬件系统,介绍了汽车CAN总线接口设计、串行接口设计和语音报警模块电路设计,监控端使用面向对象的界面化设计。应用结果表明,系统的实时性强、稳定性好,可以方便地远程观测无人驾驶汽车的运行参数。     

基于图像处理技术的汽车追尾预警系统的研究

如何防止高速公路中汽车追尾是智能交通系统所要急待解决的问题.本文利用中心透视原理和图像处理的方法可以解决车道识别,车辆识别和车间距测量的关键难点,达到高速公路汽车追尾预警的目的.实验结果表明效果良好,算法简便,可以有很好的实时性.     

基于图像处理技术的汽车追尾预警系统的研究

如何防止高速公路中汽车追尾是智能交通系统所要急待解决的问题．本文利用中心透视原理和图像处理的方法可以解决车道识别，车辆识别和车间距测量的关键难点，达到高速公路汽车追尾预警的目的．实验结果表明效果良好，算法简便，可以有很好的实时性．     

基于开放式多媒体应用平台的汽车安全监测系统设计

采用以TI达芬奇技术芯片为核心处理器的硬件平台,以依据硬件裁剪定制的Linux系统为基础,设计开发了基于计算机视觉的汽车安全系统.该系统具有超速预警、安全车距预警、事故求助、车辆位置获取和车辆防盗、防抢等功能,且系统体积小、功耗低、使用方便,易于功能扩展和升级,在高速公路上开展安全监测试验表明,文中提出的算法漏检率低于5%,误检率低于0.5%.      

基于嵌入式系统的汽车检测系统研究与设计

将嵌入式实时系统、CAN总线和多传感器信息融合技术集成在一起,设计出了汽车检测线的集中/分布式实时数据的采集系统。提出三级分布式汽车检测线测控系统,开发基于μC/OS-II实时操作系统的汽车技术状态检测体系。研究适合于汽车技术状态检测平台的实时多任务调度算法,解决优先级反转和死锁问题。基于嵌入式实时系统的汽车检测线测控系统,可以减少检测线中工控机和布线的数量,可以准确、实时的完成汽车综合性能数据的检测任务。     

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.     

Features of Women's language

Language is a means of verbal communication. People use language to communicate with each other. In the society, no two speakers are exactly alike in the way of speaking. Some differences are due to age, gender, statue and personality. Above all, gender is one of the obvious reasons. The writer of this paper tries to describe the features of women＇s language from these perspectives： pronunciation, intonation, diction, subjects, grammar and discourse. From the discussion of the features of women＇s language, more attention should be paid to language use in social context. What＇s more, the linguistic phenomena in a speaking community can be understood more thoroughly.     

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     

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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