基于自适应用户模型的RSS内容过滤

为更好地解决用户如何从过载信息中快速获取需要的信息,利用RSS标准与内容过滤技术,提出了一种使用Rocchio单次反馈和多次反馈相结合的方法,此方法可以准确、快速地追踪用户兴趣的概念漂移,自适应用户模型的变化,更好地实现用户的个性化需求.为验证该方法的可行性,实现了一个基于RSS新闻的内容过滤系统(RSS News Filtering).     

一种基于内容的信息过滤改进模型

根据过滤系统的不同过滤目的，将信息过滤分为两类：(1)基于满足用户信息需求的用户兴趣过滤；(2)基于保障数据安全和社会安全的安全过滤．在详细分析了这两类信息过滤的异同之后，指出了安全过滤研究的特殊性及其主要研究内容．在现有用户兴趣过滤系统模型的基础上，提出了一个基于内容的信息过滤模型，并对模型中新增模块进行了试验．研究结果表明，新增模块能够很好地实现基于内容过滤系统的高精度，证明了该过滤模型具有一定的实用价值．     

基于加权概念网络的用户兴趣建模

提出了一种基于加权概念网络(WCN)的用户兴趣建模方法，该方法利用动态学习算法，挖掘蕴含在用户反馈文档中的概念及其概念关系，建立WCN的用户模型，从而捕捉和表述用户兴趣偏好．基于WCN用户兴趣模型，提出了检索提问个性化理解以及文档个性化重评价的实现方法．为了检验提出方法的建模性能，设计了信息过滤仿真试验．测试结果表明，WCN有较好的用户建模性能．     

基于内容信息过滤的智能Agent及其实现

本设计并实现了一个基于内容信息过滤的智能Agent：CuteSeareher．它能够根据用户提交的示例档，采用机器学习的方法对用户的兴趣进行建模．并通过与www上的搜索引擎相互作用，自动查找用户所需的信息．在两个方面解决了现有过滤系统在学习方法方面的不足：第一，采用了概念推理网解决词组分割问题；第二，使用基于协同演化的遗传算法解决档的特征抽取问题．测试表明它可以有效地帮助用户在www上搜索信息．     

Open Bookmark——基于Agent的信息过滤系统

为解决搜索引擎等传统网络信息服务系统的不足 ,提出了一个基于 Agent的信息过滤系统—— OpenBookm ark,它提供了一个开放性的信息组织环境。 OpenBookm ark使用向量空间法和社会过滤两种信息过滤方式帮助用户获取有用信息。向量空间法采用关键词向量描述用户的信息需求 ,通过计算信息之间的相似度 ,从信息数据库中提取符合用户兴趣的信息推荐给用户 ,并根据用户的反馈信息调整关键词向量。系统采用信息 Agent获取用户的信息需求 ,以实现个性化的主动信息服务 ,Agent之间采用 Agent通信语言进行信息协作 ,实现社会过滤。在开放式信息服务系统中使用信息过滤的方法 ,可以帮助用户有效地获取信息。     

用户反馈自适应的POP3邮件过滤代理模型

为了有效接受邮件客户端反馈并自动根据邮件客户端反馈对邮件过滤系统做出调整,提出了用户反馈自适应的POP3邮件过滤代理模型SAMFUF（self-adaptive mail filtering POP3 proxy based on users’feedback）。SAMFUF采用异步连接模拟同步连接方式建立邮件客户端和邮件服务器间POP3连接,实现了邮件客户端与邮件服务器间的透明性连接;将最大熵、贝叶斯和支持向量机等基于内容过滤的方法从邮件过滤系统中独立出来,实现了通用邮件过滤系统的设计;通过在邮件中插入包含邮件唯一标识、分类结果等信息的HTML表单的标签以及调整邮件过滤模型,实现了基于邮件客户端的用户反馈以及邮件过滤系统的自适应功能;采用线程池管理线程和overlapped I／0事件通信方式实现邮件客户端与邮件服务器间通信,实现了邮件过滤服务的高效率和稳定性。实验表明,SAMFUF在垃圾邮件过滤上具有较高的效率和准确率。     

基于内容的智能E-mail安全拦截系统模型

设计了一个基于内容的E—mail安全拦截系统模型．该模型从用户的角度出发，为了满足不同用户对不同主题的需求，采用层次智能信息滤波算法和有专家指导的相关反馈学习算法，过滤掉不可信度大于阈值的非法E—mail．使收信者甚至意识不到非法E—mail的存在，有效地起到了安全卫士的保护作用．     

根据用户隐式反馈建立和更新用户兴趣模型

提出一种通过获取用户的隐式反馈信息建立和更新用户兴趣模型的方法．这种方法不需要用户显式地提供兴趣信息，只要通过观察用户在浏览Web页面时所采取的动作来获取隐式的反馈信息，并利用这些信息建立与更新用户兴趣模型，从而减轻用户的负担．     

自适应过滤算法在社区E-learning的个性化服务系统中的研究

针对学习型社区中的教育需求,在传统算法上加以改进,提出了一种基于向量空间模型的教育资源自适应过滤算法．通过训练算法,提取特征向量和伪反馈建立初始模板,设置初始阈值．然后通过过滤算法根据用户的反馈信息自适应地调整模板和阈值．该算法在执行过程中,不需要大量的初始文本,同时在过滤的过程中可不断地进行自主学习来提高过滤精度．该算法已在个性化知识服务系统中进行验证,结果表明是有效的．     

基于RSS技术的信息获取方式

阐述了RSS技术的内涵、功能及其浏览器,构建基于RSS技术为用户提供一种崭新的信息获取方式,旨在引导用户通过RSS阅读器轻松、安全、及时、高效地完成信息资源的获取。     

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.     

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     

Journal of Donghua University ( English Edition) Contents of Volume 31

正~~