云环境下的产品知识获取及学习模型

根据云环境下的产品知识资源特点,给出了一个云环境下的产品知识获取框架,该框架由企业用户层、云知识平台层和知识资源层构成;建立了云环境下的产品知识获取过程模型,通过该模型进行产品设计、制造及服务等知识挖掘、收集、分析、归纳、整理和存储等;提出了云环境下的产品知识学习过程模型,通过该模型进行产品知识学习和传播,从而实现企业员工知识能力的提升。     

领域内用户浏览行为的用户需求知识发现研究

提出一种从用户浏览网页的行为中获取用户需求知识的方法.在领域内将产品进行需求项分解,从服务器日志中提取用户点击的网页及其次数,并计算出用户对每个需求项的值和可信度,由此可提取出用户以及用户群的需求知识.该方法不仅可以及时获取最近一段时间用户对现有产品指标的关注情况,还可以在一定程度上反映用户对该类产品的某些潜在需求,为企业进行新产品开发提供参考.     

基于用户浏览时间的点击模型

用户的点击行为会受到用户的浏览行为、周围文档的特征等因素的影响,故在分析用户点击日志时不能直接将用户点击解释为文档相关性.为了更加准确地获得文档的相关性特征,文中提出了基于用户浏览时间的点击模型.假设文档原文的相关性会影响用户浏览该文档原文的时间,即文档越相关用户浏览文档的耗时越长,这样便可利用用户浏览文档的时间来推测...     

基于用户行为模型的身份验证算法研究

身份认证技术是电子商务系统的重要环节。本文根据电子商务系统用户的特点，将网络入侵检测技术的思想引入用户身份验证，提出了基于用户行为模型的身份验证方案。该方案选择用户消费习惯、用户浏览时间以及用户键盘输入特性作为数据源，根据综合验证算法计算值与阈值对照，对用户身份进行验证。本文全面阐述了该身份验证方案的基本思想、测量点的选择和取值、以及综合验证算法等关键问题和解决方案；重点介绍了基于AHP方法的用户消费习惯模型的建立过程，以及利用该模型计算某种商品和用户期望值向量的相似度算法。     

基于马尔科夫模型和贝叶斯定理的Web用户浏览行为预测模型

对用户的Web浏览行为进行分析,既可以使用户减少等待时间,同时也能减轻网络负载.依据Web网站的层次结构特点,首先设计了基于Hash表的反向索引结构来提高数据的预处理速度;在此基础上,利用分层思想构建了基于马尔科夫模型和贝叶斯定理的Web用户浏览行为预测模型.给出了模型的设计思想、相关定义、模型框架以及模型中所涉及的关键构建方法等.最后,对模型进行了实验分析,结果表明在适当的预测准确率前提下,模型能够有效减少在预测时所需的候选网页数量,并大幅提升预测效率.     

网站用户偏好度的数据挖掘模型

数据挖掘和数据库知识发现是当前国际科技界的一个研究热点。这是一个介于统计学、模式识别、人工智能、机器学习、数据库技术以及高性能并行计算等领域的交叉新兴学科,具有极为广泛的应用前景。在基于统计学观点的基础上讨论了网站用户偏好度的数据挖掘模型,设计了一个网站用户信息浏览偏好度的数据挖掘模型。     

基于层次知识模型的知识库可视化研究

针对专家系统知识库可视化问题,构建了知识库的层次知识模型,基于径向树实现了层次知识模型的可视化.以基于多级知识单元的知识库为例,研发了知识库可视化系统,通过系统运行的实例验证了该方法能够方便用户快速浏览知识库的层次结构,从而有利于提高知识库的可理解性.该方法对其它知识表示方法的知识库可视化具有借鉴意义.     

企业知识交流系统中知识专家的优化选择模型

从隐性知识和显性知识的角度分析了隐性知识对于企业的重要性,认为隐性知识是构成企业核心竞争力的基础,指出了企业内部隐性知识共享的主要途径,对知识专家地图的定义、构成、设计原则以及在知识交流过程中的作用进行了研究,在此基础上以总咨询费用为目标建立了知识专家的优化选择模型,同时兼顾企业知识交流效率,从使员工到达交流系统后必须等待的概率尽量小的角度,建立了相应的目标优化模型,并结合实例进行了计算分析。     

基于Ontology的信息检索系统研究

为了减轻用户在检索信息过程中的负担,根据现有信息检索模型存在的问题,引入本体的概念,建立了一种基于本体的信息检索模型.该模型目标是根据浏览器的历史记录、用户浏览网页的浏览行为等,来更新用户兴趣模块,以不同用户的不同信息需求向用户推荐符合用户意图的信息,从而有效的提高信息检索的查全率和查准率.     

基于协同管理模式的企业员工招聘模型研究

通过对传统企业员工招聘模式的深入分析和研究,指出了该模式存在的不足,提出了基于协同管理模式的企业员工招聘模式,并在对该模式的原理、要点以及协同过程认真分析的基础上,运用可视化的统一建模语言(UnitedModelingLanguage,UML),从静态功能、动态活动以及系统实现等不同角度给出了该模式的可视化模型,为构建基于协同管理模式的企业员工招聘系统提供蓝图,最终实现企业员工招聘过程的快速化、集成化和有效化。     

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.     

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.     

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.     

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.     

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.     

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