基于Lucene的校园信息搜索引擎的设计与实现

利用Lucene开源全文本搜索技术框架建立了校园搜索引擎,设计并实现了资源采集、信息检索、数据检索等模块,完成了一个基于Lucene的搜索引擎的应用,改进后的基于Lucene的校园搜索引擎能满足校园用户的需要并提升了搜索的准确性．     

基于Lucene的搜索引擎在远程教育平台中的实现

在现代远程教育平台上应用一个好的搜索引擎可以使用户高效的搜索到自己需要的资料．本文简要介绍了基于Java的全文检索包Lucene，然后介绍了为了对课件资源库中各种类型的文档进行搜索而基于Lucene开发的搜索引擎．     

基于Lucene的校园网搜索引擎的设计与实现

利用基于校园网的搜索引擎来搜索学校局域网内的信息已成为人们关注的热点,一方面是因为校园网内信息量不断增加,利用搜索引擎可以提高搜索效率;另一方面是因为由于网络设计的限制,百度等搜索引擎搜索不到局域网内的很多信息.在研究搜索引擎基本原理和技术的基础上,设计了基于Lucene的校园网搜索引擎.测试表明,本系统能很好地完成用户的搜索要求.     

基于Lucene全文检索引擎的研究与实现

Lucene全文检索技术是信息检索领域广泛使用的基本技术。它是一个优秀的开源全文本搜索技术框架。按照Lucene的框架规范,扩展Lucene的功能,可以将Lucene很好地嵌入到自己的搜索引擎中。首先介绍了一个高性能的全文检索引擎--Lucene开源系统,详细分析了Lucene的系统结构,程序运行逻辑,以及在Lucene上的扩展,即中文分词器的设计;然后将其引入具体应用,给出了一个基于Lucene全文检索技术的名著——《红楼梦》搜索引擎的设计与实现。     

一种有效的基于密度聚类的排序算法

个性化搜索引擎研究的目的是使搜索结果尽可能满足不同用户的信息需求,而排序算法在搜索引擎技术中占有着核心的地位.提出了一种基于改进的DBSCAN聚类的个性化排序算法,在全文搜索包Lucene与开源搜索引擎Nutch的基础上,实验证明该方法提高了用户搜索的准确率和召回率.     

一种改进的检索算法在垂直搜索引擎中的应用

本文以开源的Lucene全文检索工具为基础,设计了一个考试信息类的垂直搜索引擎.并对Lucene工具包中的检索模块做了改进,增加了网页重要性因素,主题相关度因素和用户兴趣因素.实验结果表明改进的检索算法能较大的提高系统的搜索效率,提高了用户体验.     

基于.Net的全文搜索引擎设计与实现

随着互联网信息多样化和爆炸式的发展,人们面临着"信息迷航"和"信息过载"的困扰;当代社会对信息检索的需求不仅仅局限在通用搜索引擎,更需要针对特定领域设计出个性化搜索引擎。通过分析研究网络搜索引擎的组成结构及利用Lucene构建搜索引擎的方法,在Lucene原有网页排序算法基础上,结合PageRank算法的思想和用户喜好权重,提出更具个性化的网页排序算法,以反馈给用户符合其个性化需求的搜索结果。在.Net开发平台,利用C#语言,结合几种开源API,完成了个性化网络搜索引擎系统的设计与实现。系统界面设计采用了XAML及Ajax技术,搜索结果显示模块采用异步传输技术,使用户界面更加友好。通过测试和分析,系统实现了个性化搜索,用户不翻页也可以查看全部搜索内容,用户的体验度得到了提升。下一步将增加爬虫对于网络错误信息的处理及对于病毒网站的过滤功能。     

基于网络书签的校园搜索引擎

文章立足于校园网络应用的信息搜索,首先分析了通用搜索引擎运用于校园网络的不足,然后引入了网络书签,将Web 2.0的分享理念贯彻到校园搜索引擎的构建中,并使用PageRank类似机制实现搜索结果的排序,达到了良好的效果.     

论基于Java的全文检索实现和索引性能提高

当今搜索引擎已经成为人们在网上搜索信息的重要工具,分析索引机制架构和全文检索系统结构,探讨了实现Tomcat+JSP+Lucene的运作流程和核心代码,对如何提高索引性能进行了研究.     

基于全文检索Apache Lucene引擎的原理与流程研究

根据全文检索Apache Lucene引擎原理与流程,设计了一种网络视频信息的索引方法.可以对所有的视频信息进行索引,解决了视频搜索引擎排序信息不明以及局域网站搜索的局限性等问题.     

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