医疗监护中基于分段TCP协议无线传输方式的设计

讨论了无线网络技术在医疗监护中的应用,并使用IEEE 802.15.4标准对低速率无线个人局域网作为医疗信息通信传输平台的适用性进行评估.根据医疗信息的特点,对传统的无线传输协议(TCP协议)和Snoop算法加以改进,通过加入时间戳的方式提高分段式TCP数据包传输效率和点到点的数据吞吐量,降低传输平均延迟.仿真实验表明,改进后的Snoop算法提高了低速率无线网络传输方式在医疗应用的传输效率.     

基于路由协议的低能耗数据融合方法

将无线传感器网络中的数据融合技术与路由协议相结合,详细分析了基于LEACH、图论、模糊神经网络和合作博弈的路由协议数据融合算法,给出了不同算法中影响能量消耗和时间延迟的因素,提出减少能量消耗和时间延迟的方法.最后,通过仿真实验对改进后的几种路由协议在融合能耗和平均时延方面进行比较.结果表明,改进后的数据融合算法能量消耗更低、时间延迟更少.     

基于数据和能量优先等级改进WSN中S-MAC协议的研究

通过扩展IEEE 802.11的数据帧,结合数据和能量优先等级对S-MAC协议进行改进,解决数据优先等级的携带问题.发送数据时,根据发送数据和能量的优先等级及网络负载情况,节点调整竞争窗口,使网络高优先等级数据优先发送,低优先级的数据延迟发送,减少碰撞.采用NS2仿真实验平台,对改进协议仿真测试.结果表明,改进后的S-MAC协议对高优先等级数据传输时延明显降低,均衡了网络负载,延长了网络生存时间.     

面向气象雷达数据传输的流媒体流量控制研究

气象雷达观测是气象观测的重要组成部分.气象雷达数据生成时间较长,且文件较大,在进行数据传输时,若采集完数据再传输会大大影响其数据的实时性要求.本文在分析雷达数据采集过程及特性的基础上,结合RTP/RTCP协议对拥塞判决控制进行改进,采用基于显式反馈的拥塞判决方案,设计了公平性的非线性流量控制方案,结合雷达数据生成特点,提出了使用流媒体技术的气象雷达数据传输算法SM-RTA(Weather Radar Data Transmission Algorithm Using Streaming Media Technology).通过仿真实验证明,在IP网络中,SM-RTA算法能为用户提供更稳定的实时性服务.     

基于LabVIEW的温度传感器特性实验数据分析系统设计

简要介绍了温度传感器特性实验,曲线拟合算法以及虚拟仪器软件LabVIEW,并利用LabVIEW设计了对温度传感器特性的实验数据进行曲线拟合的数据分析系统.实验表明,该数据分析系统界面友好,扩展性强,不仅可以便捷有效地对实验数据进分析,达到很高的精度,而且还提高了实验管理的自动化水平.     

改进的二进制防碰撞识别算法及其FPGA仿真实现

对RFID系统中的多标签防碰撞问题进行了研究,在3种经典的确定性防碰撞算法的基础上,提出了改进的二进制防碰撞识别算法.为了降低数据传输量,改进算法采用阅读器前缀查询和标签后缀应答相结合的方式;为了降低查询次数,查询算法针对不同数量的碰撞位采用不同的处理方式.对4种算法进行了Matlab仿真和Spartan6硬件平台实现,实验结果表明:改进算法较3种经典算法具有较高的识别效率和较低的数据传输量.     

SPI-TCP/IP协议转换的设计与实现

针对目前SPI总线通信传输距离和传输效率有限的现状,提出了一种通过SPI协议与TCP/IP协议的转换来完成串行数据到以太网数据的转换.实验结果表明,所提出的从SPI协议到TCP/IP协议的转换实现简单,转换后的数据传输速率高、可靠性好,满足设计要求.     

基于分簇和蚁群的无线传感器网络多径路由协议

为了提高无线传感器网络能量的有效性,延长网络寿命,研究了一个利用分簇机制和蚁群算法相结合的多径路由协议MRPCAC,该协议在选择簇首时考虑了剩余能量和邻居节点数量等因素,通过成簇方式减少数据的信息传输量.在数据传输时,使用蚁群算法建立多条路径,在计算状态转移概率公式中,改进了信息素浓度因子和启发函数因子.仿真实验结果表明:MRPCAC协议能够使能耗有效减少,网络生存期延长.     

Hadoop框架下的一种改进的Apriori算法

常见的基于Hadoop框架的Apriori改进算法在统计支持度时有扫描数据集、候选项集剪枝等方面效率低下且集群间的数据传输有较大的时间开销的问题,提出了一种Apriori的改进算法Apriori_Ind.算法运用Hadoop集群,使用先按事务对数据集分块,再将数据集的格式转换为项,事务集的分块处理策略,使算法充分利用分布式计算优势,实现各节点并行的实现候选项集生成与剪枝操作.并利用前项与后项的新结构表示频繁项集,新结构在各节点进行候选项集生成和剪枝时提高算法效率.Apriori_Ind具有减小集群传输代价、加速剪枝等优势.实验表明新算法适合大规模数据挖掘,特别是项的数量较大的情况下,算法性能有明显的提高.     

一种基于深度学习模型的数据融合处理算法

针对无线传感器网络传统数据融合算法效率较低、处理高维数据困难问题,提出一种基于深度学习模型的卷积神经网络结构实现数据融合的算法CNNMDA.算法首先在汇聚节点对构建的特征提取模型CNNM进行训练,然后各终端节点通过CNNM提取原始数据特征,最后向汇聚节点发送融合后的数据,从而减少数据传输量,延长网络寿命.仿真实验表明,CNNMDA与同类融合算法相比,在同样数据量的情况下能够大幅降低网络能耗,并有效提升了数据融合效率与准确度.     

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     

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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Brief Introduction to “Journal of Jilin University( Science Edition) ”

<正>"Journal of Jilin University(Science Edition)"is a comprehensive academic journal in the fields of science sponsored by Jilin University and administrated by the Ministry of Education of the Peoples Republic of China.The journal started publication in 1955.The original name at starting publication was"Journal of Natural Science of Northeast People University",which was changed into"Acta Scientiarum Naturalium Universitatis Jilinensis"in 1958 owing to the name change of the university.The present journal name has