基于本体和语义网的网络教育资源检索研究

随着教育信息化进程的大力推进,网络教育资源的建设越来越受到国家和各高校的重视.语义网提供了语义互操作模型,能有效实现网络资源的发现、共享和集成应用.阐述了语义网、语义检索、本体构建、元数据标准等关键技术,分析了本体与元数据的关系,给出了基于元数据的教育资源本体构建方法.设计了基于本体的网络教育资源语义检索系统,该系统由...     

语义网及其应用

面对万维网信息化规模急剧膨胀、信息载体也趋于多元化等原因所带来的诸多困难,语义网的提出为此提供了解决方案及技术支持,它利用对网络上的信息资源添加语义,达到不仅为人们所理解,也可以使机器理解和处理的目的.本文首先介绍了语义网的背景、基本概念、技术框架,然后阐述了语义网的结构框架以及各层次之间的协作关系与作用.结合一个实例...     

基于Linked Data技术的公安监控系统技术研究

信息化对传统的公安系统情报系统提出了前所未有的挑战,公安系统信息化是公安情报系统升级改造的重要工作.警用语义网情报系统对公安的情报信息的提取和共享等方面有很好的支持.运用基于Linked Data技术的语义网,对公安的重点人员监控系统进行研究分析,提出监控系统的工作流程.     

语义网的研究与展望

介绍了语义网的相关概念、体系结构及基本构成,阐述了语义网的研究现状及应用范围,总结了未来语义网的基础研究和应用研究的方向,分析了语义网如何能够在网络检索中完成精确、智能检索,并对语义网面临的问题和发展前景进行了描述。     

语义网环境下的信息资源整合模式探讨

语义网是目前WWW的扩展,它在计算机和人类理解的语义间建立了联系。其目标是帮助人类和计算机更好地协同工作。文中分析了语义网与本体技术及语义网环境下信息资源整合的特点,在语义网技术的基础上提出了一种基于语义的异构数据的整合模式,解决了资源重组。     

Eclipse语义网建模工具的分析与应用

介绍了Eclipse平台和语义网的背景知识,论述了Eclipse平台的总体框架和技术架构.对语义网的体系结构进行了介绍,并详细介绍了语义网建模的基础RDF和OWL.结合实例说明了语义网建模的过程.并着重介绍了建模工具RDFBuilder的实现.     

基于本体的语义网在数字图书馆中的应用

介绍了本体和语义网,提出了基于本体的语义网在数字图书馆中的一个应用模型——自动文本分类器。     

语义网在数字图书馆的应用现状及展望

互联网的缺点日益显现,新一代万维网一一语义网应运而生。语义网具有七层体系结构。Web3．0的核心技术就是语义网。这些技术在信息获取、知识管理、Web服务、语义搜索、电子商务等方面已有积极应用。语义网在数字图书馆领域的应用,是现在的研究热点和未来的发展趋势。     

语义出版的发展及相关概念和技术简析

语义出版是数字出版的高级形态,源于语义网.简述了语义出版的提出过程、相关概念、术语,所涉及与语义出版有关的语义网技术,并对语义出版的应用现状和未来发展作了简单介绍.     

细粒度语义网检索

语义网的有向标记图数据模型决定其在内容检索方面与纯文本、超文本或半结构化文档检索存在较大差异.现有检索模型和相似度计算方法不能完全满足对语义网的检索和评价.该文以资源这种较细粒度作为检索单元,考虑查询关键字在资源内容中的频率和结构分布,提出一个细粒度语义网检索模型,并扩展了相似度计算公式和倒排索引结构.在语义网挖掘系统(semantic web aiding rich miningsystem,SWARMS)中实现了该模型及相关算法.在SourceForge和DBLP两个测试集上的实验表明,该模型能够结合语义网结构查询与基于关键字的内容查询,在相同查全率下查准率是单独应用结构或内容查询的两倍左右.     

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.     

Characterization of Ordovician carbonate reservoirs, southeastern Saskatchewan, Canada

The discovery of the prolific Ordovician Red River reservoirs in 1995 in southeastern Saskatchewan was the catalyst for extensive exploration activity which resulted in the discovery of more than 15 new Red River pools. The best yields of Red River production to date have been from dolomite reservoirs. Understanding the processes of dolomitization is, therefore, crucial for the prediction of the connectivity, spatial distribution and heterogeneity of dolomite reservoirs.The Red River reservoirs in the Midale area consist of 3～4 thin dolomitized zones, with a total thickness of about 20 m, which occur at the top of the Yeoman Formation. Two types of replacement dolomite were recognized in the Red River reservoir: dolomitized burrow infills and dolomitized host matrix. The spatial distribution of dolomite suggests that burrowing organisms played an important role in facilitating the fluid flow in the backfilled sediments. This resulted in penecontemporaneous dolomitization of burrow infills by normal seawater. The dolomite in the host matrix is interpreted as having occurred at shallow burial by evaporitic seawater during precipitation of Lake Almar anhydrite that immediately overlies the Yeoman Formation. However, the low δ18O values of dolomited burrow infills (-5.9‰～ -7.8‰, PDB) and matrix dolomites (-6.6‰～ -8.1‰, avg. -7.4‰ PDB) compared to the estimated values for the late Ordovician marine dolomite could be attributed to modification and alteration of dolomite at higher temperatures during deeper burial, which could also be responsible for its 87Sr/86Sr ratios (0.7084～0.7088) that are higher than suggested for the late Ordovician seawaters (0.7078～0.7080). The trace amounts of saddle dolomite cement in the Red River carbonates are probably related to "cannibalization" of earlier replacement dolomite during the chemical compaction.     

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.     

A computer generator for randomly layered structures

AcomputergeneratorforrandomlylayeredstructuresYUJia shun1,2,HEZhen hua2(1.TheInstituteofGeologicalandNuclearSciences,NewZealand;2.StateKeyLaboratoryofOilandGasReservoirGeologyandExploitation,ChengduUniversityofTechnology,China)Abstract:Analgorithmisintrod…     

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.     

海南岛地体及其毗邻陆缘晚中生代—新生代古地磁研究和构造演化

本文叙述了对海南岛及其毗邻大陆边缘白垩纪到第四纪地层岩石进行古地磁研究的全部工作过程。通过分析岩石中剩余磁矢量的磁偏角及磁倾角的变化,提出海南岛白垩纪以来经历的构造演化模式如下:早期伴随顺时针旋转而向南迁移,后期伴随逆时针转动并向北运移。联系该地区及邻区的地质、地球物理资料,对海南岛上述的构造地体运动提出以下认识:北部湾内早期有一拉张作用,主要是该作用使湾内地壳显著伸长减薄,形成北部湾盆地。从而导致了海南岛的早期构造运动,而海南岛后期的构造运动则主要是受南海海底扩张的影响。海南地体运动规律的阐明对于了解北部湾油气盆地的形成演化有重要的理论和实际意义。     

《Chinese Science Bulletin》SUBJECT INDEX TO VOLUME 59(2014)

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Achieving Unusual States of Matter Under High Pressure

The elongation method,originally proposed by Imamura was further developed for many years in our group.As a method towards O(N)with high efficiency and high accuracy for any dimensional systems.This treatment designed for one-dimensional(ID)polymers is now available for three-dimensional(3D)systems,but geometry optimization is now possible only for 1D-systems.As an approach toward post-Hartree-Fock,it was also extended to     

Exciton Seebeck in Molecular Systems

Various applications relevant to the exciton dynamics,such as the organic solar cell,the large-area organic light-emitting diodes and the thermoelectricity,are operating under temperature gradient.The potential abnormal behavior of the exicton dynamics driven by the temperature difference may affect the efficiency and performance of the corresponding devices.In the above situations,the exciton dynamics under temperature difference is mixed with