基于Ontology的个性化E-Learning系统研究

随着WI(Web Intelligence)技术的发展,如何使传统的E-Learning系统向个性化和智能化方向发展已成为业内的一个主要研究领域.本文首先对E-Learning系统的资源异构和用户个性化需求等问题进行了分析;然后介绍了"基于本体的个性化E-Learning(Ontology Based Personal E-Learning,OBPEL)系统模型",该模型利用本体方法给出了一种面向语义的非结构化教学资源的表示机制,从而为进行非结构化教学信息的语义访问和个性化学习奠定了基础.本文最后初步实现了一个基于本体的个性化E-Learning系统原型.     

基于本体的教学资源库的设计

本文首先将本体概念引入到教学资源库领域,然后对本体技术进行详细的分析,接下来将本体与教学资源库结合在一起,完成从结构化到语义化的描述,并提出了基于本体的教学资源库实现模型,论述了该模式中的核心设计思想,按照先建立共享词汇库（全局本体）,再建立局部本体,上升到本体语义高度进行映射的思想进行总体设计,并提出了数据资源层、业务中间件层和应用表示层的三层实现方式。     

基于本体的适应性学习系统(OBALS)之系统模型

提出一种基于本体的适应性学习系统,在不改变现有E-Learning系统学习模式的基础上,为学习者提供一个基于广域资源共享的适应性课程学习环境,从而解决现有E-Learning系统中网络课程缺乏个性化支持、已有优质网络教育资源较难重用,以及现有的适应性教学系统研究成果不能普及应用等问题.最后构建了一个系统原型,并提供了适应性学习处理过程.     

面向文物鉴定本体的基础模型与建模环境

建立面向文物鉴定本体的基础模型环境是文物数字化和建立数字博物馆的基础,其核心文物鉴定基本模型(FMA2)是一个关于可移动文物结构化组织的概念及概念间关系的领域本体,包含了从构成文物器物的材料对象以及与它们关联的非材料实体(时间、空间、面、线和点),用以描述文物器物结构化的关系.提出了基本模型及其建模环境包括本体的定义及方法论、一个四元组的高级模式、一组准则和基于帧的创作环境.建议FMA2作为文物信息学的一种参考本体,以使在文物鉴定中不同的观点能相互关联,矫正在文物信息学本体中现有的和新发现的本体,并提供用于表示文物功能的结构化模板,使文物数字化过程中统一语义标注并提高本体的重用性.     

基于本体的语义相似度计算研究

语义相似度计算在自然语言理解与处理、信息检索、知识获取、机器翻译等领域具有重要作用.近年来,随着知识本体和知识图谱研究的深入,面向复杂关系处理的结构化知识表达手段更为丰富和强大,从而推动了基于本体的语义相似度计算方法的快速发展.基于本体的语义相似度计算大致分为基于距离的方法、基于信息量的方法、基于属性的方法和混合式方法 4种代表性方法.回顾了上述方法的发展脉络,分析了各自的基本思想和主要实现方法,并对其优缺点进行了系统比较.最后总结了语义相似度的评测方法,并在此基础上,展望了基于本体的语义相似度计算方法的发展方向.     

基于XML的自适应E-Learning系统模型的研究

在现有的基于Web的E-Learning 系统模型分析的基础上,提出了一种新的基于XML的E-Learning 系统模型,该模型采用了贝叶斯网络的推理机制来建立学生学习模型,以实现适应性学习、个性化学习;在实现系统模型上引入了XML技术,以实现学习资源的标准化.     

语义Web框架下的e-Learning系统设计

共享性和适应性差是当前e-Learning应用系统中存在的主要问题，原因在于学习资源缺乏语义和系统共享机制弱。将本体和Web服务技术引入到e-Learning应用中，构建了一个开放的适应性e_Leaming系统结构，利用本体来描述学习资源的语义，通过web服务支持个性化学习和系统间的资源共享。该方法把建立良好个性化功能的适应用教育系统和分布的学习资源网络环境进行了有效的结合。     

基于QoS本体的语义Web服务选择算法

引入QoS本体,提出了一种基于QoS本体的语义Web服务选择算法.该算法通过构造Web服务的QoS本体模型以支持异构QoS参数的语义描述和度量,并将QoS语义匹配和数值匹配相结合,从而更准确地为用户选择满足其个性化需求的Web服务.仿真实验表明,基于QoS本体的语义Web服务选择算法能够充分利用QoS语义和数值信息,为用户选择更合适的服务,实现用户对Web服务的个性化需求.     

基于本体的虚拟自适应学习系统研究

为了根据学生的个性特征和学习进程动态地呈现教学内容，更好地满足学习者的需要，本文在描述自适应学习系统、语义网和本体的相关知识基础上，提出了一个基于课程本体和用户模型的虚拟自适应学习系统体系结构并描述了它的工作过程。     

基于抽取规则和本体映射的语义搜索算法

针对目前语义搜索过程中存在效率低、 用户推荐误差大等问题, 提出一种基于抽取规则和本体映射的语义搜索算法. 首先根据用户语义搜索要求抽取语义中的元素和属性, 解决数据利用率低的缺陷; 然后建立语义模型, 构建本体之间的元素及属性之间的映射, 消除用户需求和计算机之间的语义偏差; 最后将语义搜索算法应用于用户个性化推荐系统. 实验结果表明, 该语义搜索算法有效提高了搜索效率, 降低了用户个性化推荐误差.     

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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