视觉诱发电位脑机接口关键技术研究

脑机接口（brain—computerinterface,BCI）是近10年发展起来的一种新颖的人机接口方式．它是不依赖于脑的正常输出通路（外周神经系统及肌肉组织）的脑机（计算机或其它装置）通讯系统．脑机接口的一个重要用途不仅为那些思维正常但有严重运动障碍的患者提供语言交流和环境控制途径,还在工业、航空、军事等领域也有潜在的应用价值．本文介绍了基于视觉诱发电位脑机接口的工作原理,从系统设计、数据获取及处理方法等方面论述了脑机接口设计中的关键技术,最后指出了视觉诱发电位脑机接口存在的主要问题和发展趋势．     

视觉诱发电位脑机接口关键技术研究

脑机接口（brain—computerinterface,BCI）是近10年发展起来的一种新颖的人机接口方式．它是不依赖于脑的正常输出通路（外周神经系统及肌肉组织）的脑机（计算机或其它装置）通讯系统．脑机接口的一个重要用途不仅为那些思维正常但有严重运动障碍的患者提供语言交流和环境控制途径,还在工业、航空、军事等领域也有潜在的应用价值．本文介绍了基于视觉诱发电位脑机接口的工作原理,从系统设计、数据获取及处理方法等方面论述了脑机接口设计中的关键技术,最后指出了视觉诱发电位脑机接口存在的主要问题和发展趋势．     

喷头综合性能精密测试试验台的研制

为精密测试喷头的综合性能，研制了喷头综合性能精密测试试验台．试验台能够精确测量现场温度、压力、总流量、各分流量及喷雾角等参数．通过数据采集网络采集数据，多片采集卡通过RS485总线连接，并通过专门开发的数控系统与上位管理机相连．数控系统的任务是对采集数据进行初步处理并把数据传输给上位管理机，配合上位机完成整个控制任务，也可独立完成各项控制功能．喷雾角的测量是通过图像处理技术实现的．在数据处理过程中，应用了数据融合技术、神经网络技术及分段处理技术，因而提高了采集数据的精度．     

基于支持向量机的图像识别

支持向量机是统计学习方法,正成为当今研究的热点．支持向量机在模式识别和文本分类等方面获得了极大的成功,分类的准确率很高,用支持向量机的方法处理一些二值图像和灰度图像,能获得较好的统计结果．从中摸索出了一种特征向量集的选取方法,讨论了判断结果优劣的标准,比较了支持向量机方法与其他方法得到的结果,得出了重要结论：用支持向量机识别图像的边缘具有非常优异的统计性能．     

基于软件无线电的双向时间同步系统设计与实现

针对全球导航卫星系统建设成本高，信号易被干扰和欺骗等问题，本文基于Zedboard+AD9361软件定义无线电平台设计出一套小型化、高精度的无线时间同步系统．整个系统分为双向时间同步模块和无线通信模块：双向时间同步模块处理主从机时间戳的标定、偏差的计算；无线通信模块将数据进行伪码扩频、数字上变频、部分匹配滤波-快速傅里叶变换捕获，实现主从机之间的无线通信．通过主从机输出到示波器上的1PPS信号比对测试，主从机之间的时间同步误差均方根值（RMS）为18.6ns.     

大型养路机械车载数据采集系统的设计

为解决大型养路机械中信号采集和处理的需求,设计了多通道多模式数据采集系统,以SAM9X35为核心,以大容量DDR2为数据缓存,将采集到的数据采用CAN总线传至上位机,下位机模块可以进行在线升级．整体方案包括系统电源管理模块的方案．CAN通信接口电路以及下位机数据采集模块的设计与实现．根据系统的复杂性和多任务性,采用μC／OS—II实时操作系统,开发了数据采集和预处理程序．     

用VB实现PC机与单片机通信及数据管理

在VB6．0环境下,构造通信协议,实现上位机(PC机)与下位机(单片机)通信,对下位机多路信号实时采集、存储,并对下位机运行情况实时监控,将采样数据动态存储。同时系统具有数据的统计、处理、绘图显示及报警等功能。     

基于LabVIEW的电喷发动机故障诊断实训考核系统

为完善电喷发动机多媒体实训教学系统,设计出了实训考核子系统．系统采用WAP200B无线串口通讯模块实现实训终端与数据收发控制中心交换数据,数据收发控制中心采用ATmega128单片机作为数据处理与打包的主处理器．通过RS232串行通信向PC机提交数据,PC机利用LabVIEW8．2实现数据的解包、处理、显示和存储．试验证明系统稳定可靠．     

车用汽油机排放控制技术研究

本文分析了车用汽油机常用排放控制技术．主要从机前净化技术、机内净化技术和机外处理技术对当前汽车采用的各种技术原理、应用现状进行了分析,同时对各项技术的优缺点及应用前景进行了比较．并阐述了当前排放处理中存在的问题．对今后技术的发展提出了建议。     

交流调速系统的自学习控制

本文介绍了Ｉ／Ｏ映照记忆模型自学习控制的理论和方法,并用其为具有重大节能意义的泵类、风类机类等交流调速装置设计通用的智能控制器,以实现对期望转速的跟踪控制．文中给出了统一的系统模型描述、学习控制原理及初值控制的处理方法．     

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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