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NER的石油非结构化信息抽取研究

随着"智能油田"的建设加快,构建基于海量石油数据的智能分析系统意义重大。然而,由于石油生产过程中产生的文本数据往往无结构且类型多样,从中抽取关键信息进行分析成为一个研究热点,而信息抽取又需要高质量的语义实体做支撑。根据这一特定问题,提出基于命名实体识别（Named Entity Recognition,NER）技术针对石油非结构化文本进行信息抽取,构建双向长短时记忆（Bidirectional Long Short-Term Memory,Bi LSTM）网络模型提取语料特征,并结合条件随机场（Conditional Random Field,CRF）做分类器,构建了基于Bi LSTM+CRF的高精度NER模型,针对石油工业领域的非结构化文本进行命名实体抽取。通过在修井作业文本数据集上进行对比实验表明,本方法具有较高的精确率和召回率。     

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.     

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.     

Lower Paleozoic oil relationships within Williston Basin, Canada

The Williston Basin is a significant petroleum province, containing oil production zones that include the Middle Cambrian to Lower Ordovician, Upper Ordovician, Middle Devonian, Upper Devonian and Mississippian and within the Jurassic and Cretaceous. The oils of the Williston Basin exhibit a wide range of geochemical characteristics defined as "oil families", although the geochemical signature of the Cambrian Deadwood Formation and Lower Ordovician Winnipeg reservoired oils does not match any "oil family". Despite their close stratigraphic proximity, it is evident that the oils of the Lower Palaeozoic within the Williston Basin are distinct. This suggests the presence of a new "oil family" within the Williston Basin. Diagnostic geochemical signatures occur in the gasoline range chromatograms, within saturate fraction gas chromatograms and biomarker fingerprints. However, some of the established criteria and cross-plots that are currently used to segregate oils into distinct genetic families within the basin do not always meet with success, particularly when applied to the Lower Palaeozoic oils of the Deadwood and Winnipeg Formation.     

An Analysis of Catherine＇s Character——Wuthering Heights

Wuthering Heights, Emily Bronte＇s only novel, was published in December of 1847 under the pseudonym Ellis Bell. The book did not gain immediate success, but it is now thought one of the finest novels in the English language. Catherine is the key character of this masterpiece, because everybody and everything center on her though she had a short life. We can understand this masterpiece better if we know Catherine well.     

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.     

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.     

Design and analysis of generic LBS application developing platform

Location based services is promising due to its novel working style and contents.A software platform is proposed to provide application programs of typical location based services and support new applications developing efficiently. The analysis shows that this scheme is easy implemented, low cost and adapt to all kinds of mobile nework system.     

橡胶颗粒沥青混合料低温抗裂性试验研究

以AC-13级配为基础,将橡胶颗粒代替部分集料掺入混合料中,以低温弯曲试验为评价方法对不同橡胶颗粒掺量下沥青混合料的低温抗裂性进行研究,并引入应变能密度值对混合料的低温抗裂性进行综合评价.试验结果表明:橡胶颗粒沥青混合料试件的破坏微应变均超过2 300,满足冬寒区的技术指标;无论是否掺加橡胶颗粒,随着温度的下降,沥青混合料破坏时的最大弯拉强度增大,弯拉应变降低,劲度模量增大;弯曲应变能密度在胶粒掺量为1%左右时具有较大的弯曲应变能密度值,此时橡胶颗粒沥青混合料具有较好的低温抗裂性.     

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。     

Quantitative trait loci （QTLs） for quality traits related to protein and starch in wheat

Quality traits in wheat （Triticum aestirum L.） were studied by quantitative trait locus （QTL） analysis in a recombinant inbred line （RIL） population, a set of 131 lines derived from Chuan 35050 × Shannong 483 cross （ChSh）. Grains from RILs were assayed for 21 quality traits related to protein and starch. A total of 35 putative QTLs for 19 traits with a single QTL explaining 7.99-40.52% of phenotypic variations were detected on 10 chromosomes, 1D, 2A, 2D, 3B, 3D, 5A, 6A, 6B, 6D, and 7B. The additive effects of 30 QTLs were positive, contributed by Chuan 35050, the remaining 5 QTLs were negative with the additive effect contributed by Shannong 483. For protein traits, 15 QTLs were obtained and most of them were located on chromosomes 1 D, 3B and 6D, while 20 QTLs for starch traits were detected and most of them were located on chromosomes 3D, 6B and 7B. Only 7 QTLs for protein and starch traits were co-located in three regions on chromosomes 1D, 2A and 2D. These protein and starch trait QTLs showed a distinct distribution pattern in certain regions and chromosomes. Twenty-two QTLs were clustered in 6 regions of 5 chromosomes. Two QTL clusters for protein traits were located on chromosomes 1D and 3B, respectively, three clusters for starch traits on chromosomes 3D, 6B and 7B, and one cluster including protein and starch traits on chromosome 1D.     

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.