基于NFC和3G技术的信息发布系统设计

设计了一种基于NFC和3G技术的信息发布系统。该系统以STM32F103C8T6为主控制芯片,运用NFC技术和网络通信技术,支持用户的NFC移动设备读取系统所发布的各类信息,系统还针对NFC传输的数据格式进行重新编码,保证用户获取信息的安全性。系统采用的NFC技术能更好地保证信息传播的安全,用户可用随身携带的手机读取信息,具有很高的推广和应用价值。     

新一代WLAN网络监控与用户行为分析系统

研究和分析了传统无线局域网（wireless local area network,WLAN）,针对其采集框架架构不尽合理,扩展性较差以及无法分析用户接入特征等缺陷,开发了新一代WLAN网络监控与用户行为分析系统。该系统采用设备指标管理和用户指标管理“双核心”的内部框架,建立统一采集平台,使用贴标签技术的多采集模式。通过精确流量流向分析和用户行为深度挖掘,实现了全面监控,能支持非标准设备,可降低系统成本。     

基于应用层组播的流媒体直播系统的设计与实现

随着互联网网络带宽的不断提高,基于流媒体技术的视频应用越来越多,本文基于应用层组播思想,设计并实现了一个可支持大规模实时用户的流媒体应用层组播系统——MixCast.该系统采用双层架构,在大规模用户环境下具有良好的可扩展性；在转发树构造方面,采用了整体分层、局部集中的思想,结合最大链路带宽与最近网络拓扑策略进行节点选择,保证了构造的速度和可靠性；在转发树重构方面,通过链路预留技术和异常节点处理算法,有效地减少了节点失效后的重构时间.该系统支持IPV4/IPV6,通过测试,证明该系统占用的网络带宽和服务器资源较少,能够同时支持大规模用户,具有较高的实用价值.     

基于LDAP的统一身份认证管理系统的设计与实现

文章介绍了一个支持用户单点登录的统一访问控制系统,系统基于LDAP目录服务,它将各种应用系统的身份认证结合在一起,实现了用户统一管理的安全访问。系统采用优化技术,有效的解决了大量用户访问LDAP时的瓶颈问题。     

可支持属性撤销的基于 CP-ABE 可搜索加密方案

针对目前基于属性的可搜索加密方案存在密钥泄露以及不支持属性撤销的问题,提出了一种云环境下,安全高效、可支持属性撤销的基于 CP-ABE （ciphertext-policy attribute based encryption）的可搜索加密方案。该方案不仅可支持细粒度的访问控制,具有较高的计算效率,且用户密钥使用随机值盲化后提交服务器,保证了用户密钥的保密性和安全性。该方案支持用户属性的撤销,并在属性撤销过程中,将密文更新的大部分工作转移给云服务提供商完成,方案在保证安全性的前提下,进一步降低了用户的计算代价。方案的安全性基于 DL（decisional linear）假设,在通用模型下具有选择明文攻击安全,抗合谋攻击,前向安全和后向安全。     

基于应用层组播的流媒体直播系统的设计与实现

随着互联网网络带宽的不断提高,基于流媒体技术的视频应用越来越多,本文基于应用层组播思想,设计并实现了一个可支持大规模实时用户的流媒体应用层组播系统——MixCast.该系统采用双层架构,在大规模用户环境下具有良好的可扩展性;在转发树构造方面,采用了整体分层、局部集中的思想,结合最大链路带宽与最近网络拓扑策略进行节点选择,保证了构造的速度和可靠性;在转发树重构方面,通过链路预留技术和异常节点处理算法,有效地减少了节点失效后的重构时间.该系统支持IPV4/IPV6,通过测试,证明该系统占用的网络带宽和服务器资源较少,能够同时支持大规模用户,具有较高的实用价值.     

集中供热系统管网调节方法探讨

对集中供热系统管网调节方法进行了探讨,并着重介绍了分阶段改变流量的质调节方式的计算方法,指出这种调节方式既能保证用户的供热效果,又能起到节约能源的作用。     

新型基于激光雷达的主动防撞系统

为解决传统主动安全控制系统人机交互性能较差的问题, 提出了一种全新的基于SICK LMS151 激光雷达的主动防撞系统。该系统采用Freescale MC9S08DZ60 单片机为中央处理器, 具有双执行模式的特点, 既可自身处理数据并控制执行器执行预定操作, 也可作为网关将数据结果通过USB 端口有线传输和无线WiFi 信号两种
传输方式上传到上位机进行处理, 并支持用户远程警戒参数配置。实验表明, 该系统较好地解决了主动安全系统人机交互性较差的问题, 增强了主动安全控制器与用户的互动性。     

基于移动终端的数字电视机条件接收方案研究

近年来我国数字电视产业发展迅猛,条件接收是数字电视系统中的重要业务支撑系统,条件接收系统保证了数字电视运营商的经济利益和收视用户的服务权益,目前我国的数字电视条件接收系统基本上都采用智能卡与机顶盒配合的方式实现用户密钥的保护和节目授权,由于在大部分家庭中多人共享一个机顶盒,这就很难实现针对个人用户的个性化业务服务,同时也使得用户被限定在一个机顶盒上享受所购买的节目服务。针对以上问题,本文在现有的数字电视条件接收系统上,改进用户管理系统和用户授权系统,增加认证服务器和动态密钥授权系统,设计了支持动态用户分配密钥的机顶盒和智能移动终端认证架构,并通过个人智能移动终端、机顶盒和认证服务器之间的用户动态密钥认证和授权协议,实现个人的数字电视节目收视授权,实现了针对个人用户的个性化服务。     

基于流量特征识别的哑终端安全管控系统

网络摄像头、网络打印机这类基于IP协议无用户交互界面的物联网哑终端通常基于嵌入式系统开发,存在程序固化难以更新、计算资源有限、采用简单的安全认证机制等问题,出现安全漏洞难以进行升级很容易被攻击者控制发起网络攻击.针对上述问题,本文设计并实现了基于流量特征识别的哑终端安全管控系统.该系统提取终端的流量特征,实现终端的身份鉴别和行为监管.在设备接入时,提取终端的流量静态特征实现身份鉴别;在设备接入后通过分析流量动态行为特征判断其是否存在异常行为.发现异常行为后阻断会话连接.该系统在实验环境和实测环境下性能均表现较好,设备识别准确率达到96.6%,异常检测准确率达到97.7%,可有效检测DOS、端口扫描等网络攻击行为.      

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     

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