基于肌音信号的虚拟假肢控制

将肌音(Mechanomyography,MMG)信号作为假肢控制的生理信号源,实现了对于虚拟假肢的抓放控制。针对手部在握紧-张开动作过程中前臂肌肉声音信号,提取动作信号的7种时域特征并利用线性分类器进行分类识别,用以分辨手部动作类型,正确率为(95.63±2.55)%,并利用辨识结果产生控制信号实现对虚拟手的控制。结果表明肌音信号的动作判断具有很高的正确率,为利用肌音信号控制假肢提供了依据。     

颞下颌关节音的分形分析

颞下颌关节（ＴＭＪ）是人体最复杂的关节之一，有着复杂的生理功能。颞下颌关节音（颚开合时ＴＭＪ产生的声音）含有丰富的有关ＴＭＪ状态的信息，本文利用非线性动力学的混沌与分形理论对健康人和颞下颌关节内紊乱（ＴＭＪＩＤ）患者的颞下颌关节音信号进行了分析。结果表明，鄂开合时ＴＭＪ产生的振动是一种复杂的混沌振动，由此产生的颞下颌关节音信号具有分形结构，其维数为分数，且健康人颞下颌关节音信号的相关维数值明显高于     

基于肌音信号分析的踝关节动作模式识别

通过测量分析受试者小腿胫骨前肌和腓骨短肌的肌音信号,对踝关节背伸、跖屈、外展、内收等4个动作进行模式识别研究。提出了基于二次包络线的不等长信号分割算法,以及基于非线性小波变换的奇异值特征提取方法,并使用SVM分类器进行模式识别。结果表明:基于不等长分割的算法可以有效截取踝关节肌音信号的动作段信号;在两通道信号采集的情况下,利用非线性小波变换得到的奇异值特征在踝关节四模式识别中总体准确率可以达到87.8%,验证了本文提出的分析方法的有效性。     

煤矿井下地音监测信号的小波变换处理方法

针对煤矿井下地音信号复杂的情况,提出一种基于小波变换的地音信号处理方法,并对现场信号进行实验分析.结果表明：小波变换方法可以去除地音信号的背景噪声,将复杂的声发射波形数据分解为具有单一特征的波.该研究为工作面动力灾害的实时预报提供了依据.     

基于支持向量机的肌电信号小波特征分类解码

采用小波变换进行肌电信号预处理与多尺度分解,并采用小波系数最大值与平均能量值作为肌电信号特征,采用支持向量机进行特征分类识别的运动解码,并用此方法进行了腕部动作识别的实验.与时域特征、频域特征、AR参数特征提取方法以及神经网络识分类别方法进行对比,结果表明:基于支持向量机的小波特征提取方法可以较好地区分不同腕部动作,具有最高的分类精度,极大改善前臂假肢的操纵性能.     

腰背屈伸肌群等速力星重复测量边程中肌力变化特征研究

目的：通过对腰背屈伸运动时一系列肌肉特征参数值的测试和分析,探讨和研究等速运动状态下躯干屈伸动作时屈伸肌的力学特征。结果：（1）等速向心运动时,伸肌的峰值力矩值随角速度的增加而减少（P〈0．05）,屈肌峰值力矩值未见规律性的变化;屈、伸肌的峰值力矩比随角速度的加快而增大,但差异无显著性意义（p〉0.05）。（2）屈、伸肌的峰值力矩先上升后下降。结论：由此看出运动队力量训练进行腰背屈伸肌群等速向心康复训练时宜采用3～6组慢速或中速方式：等速力量评价时应以第3组或／和第4组的测试数据为基础进行评价。     

基于肌音信号短时傅里叶变换的桡侧腕屈肌疲劳程度研究

肌肉疲劳是由运动引起的肌肉最大随意收缩力减小的现象,其研究可应用于生理医学的职业病预防或体育工程的运动员训练等方面。本文采用短时傅里叶变换对肌音信号进行处理,提取频域特征平均功率频率(Mean Power Frequency,MPF)和中值频率(Median Frequency,MDF),研究其与肌肉疲劳程度之间的关系。9名健康的男性志愿者参与了本次试验,采用等值于60%最大随意收缩力(MVC)的力产生恒力肌肉疲劳,同步记录每一位受试者桡侧腕屈肌的肌音信号,对提取的频域参数进行分析。将持续30s的肌肉疲劳过程分为6个时间阶段(每个阶段为5s),并对每个时间阶段内的MPF和MDF计算均值。结果表明,随着肌肉疲劳程度加深,肌音信号的MPF和MDF在每个时间阶段内的均值均呈现近似线性下降的趋势。在30s肌肉疲劳过程中,从第1阶段(1~5s)到第6阶段(26~30s),MPF均值下降了15.8%,MDF均值下降了26.1%。基于短时傅里叶变换提取的MPF和MDF指标能良好地反映疲劳敏感性和稳定性,在评定肌肉静态疲劳方面是较好的参考指标。本文采用的方法和得到的结果为后期更深入地使用肌音信号对肌肉疲劳程度进行量化研究提供了依据。     

悬吊法体能训练的演变及其基本特征分析

本文通过文献资料法,介绍了悬吊训练的起源、发展、概念演变及其基本特征。通过分析发现悬吊训练在运动训练过程中形成了其独特的体系特征：（1）训练器材简易可控;（2）强调不稳定状态下的训练负荷效应;（3）训练方式多样——开链、闭链;（4）以局部稳定肌为其训练重点,并强调对于整体运动肌的训练,以达到整条＂运动链＂的有效运行;（5）突出运动感觉综合训练,强调在不稳定的状态下达到对感觉运动器官的诱发;（6）遵循渐进抗阻的训练原则和以闭合链运动为主的原则,达到逐步发展运动员体能素质的目的。     

浅谈对男女手印的判断

目前,手印已经成为确定犯罪、抓获罪犯的一项重要证据,这一刑事技术中不可缺少的重要手段,发展至今已有一百余年的历史。指纹具有人各不同,终生不变和触物留痕的特点。科学正确地分析、鉴定指纹对于开展侦查工作、惩治犯罪具有重要的实践作用,而现今警力不足现象在各地普遍存在,提高手印鉴定速度对于侦查破案有着重要意义。经过查阅书籍、资料,发现男性与女性手印因为在生理原因及社会原因等的影响下各有不同,在形态特征（包括指尖形态、指尖缺损情况、小指弯曲度、腕部三角内外侧的对称性等）、手掌及手指纹线密度、长宽比值、身高与手掌长度的比值、花纹类型、手的各位的长度、手掌部花纹形态等,均存在着不同程度的差别。     

基于语谱图的改进型LBP肺音识别

为了准确区分各种肺音信号,获得更理想的肺音识别效果,提出了一种基于语谱图的改进型LBP肺音识别方法.首先通过短时傅里叶变换将肺音信号转化为灰度语谱图;其次利用改进后LBP算法计算语谱图的局部纹理关系,将局部二值模式特征进行级联构成特征向量;最后利用支持向量机对正常肺音和三类异常肺音信号进行识别分类.结果表明,该方法对不同肺音信号的识别率可达92.59%,为肺部疾病的医疗诊断提供了新的思路.     

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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