Deep Web数据库集成技术的研究

针对基于查询接口集成的web集成技术复杂且面向领域这一现象,提出了一种非实时查询Deep Web数据库集成技术.该技术通过在被检索网站安装客户端数据源应用程序,获取所有被检索网站的Deep Web数据源连接信息、Deep Web异构数据库表结构信息以及Deep Web异构数据库表数据.其中表结构和表数据经集成系统解析后以统一的格式集成到本地数据库.实验结果表明,该集成技术可集成所有领域的Deep Web异构数据库,没有领域限制.由于是本地查询查询速度也较快,具有一定的可行性.     

Deep Web数据源聚类分类算法研究

在Internet技术飞速发展的今天,人们对依靠Web引擎搜索可用信息的实效性、快捷性的研究在不断的深入。然而许多Web信息已经被各种各样可搜索的在线数据库所深化,并被隐藏在Web查询接口下面。传统的搜索引擎由于技术原因不能索引这些信息——Deep Web信息。由于Deep Web数据的异构性和动态性,有效地把这些信息加以利用是一件具有挑战性的工作。因此,本文分别提出了基于Deep Web查询接口的Deep Web数据源聚类和分类算法,为Deep Web信息检索方法的研究提供了一定的理论依据。     

Deep Web站点分类研究进展

如何高效、准确地组织和检索Deep Web蕴含的高质量信息已经成为未来Web挖掘和数据库领域面临的一项崭新课题和挑战,而Deep Web分类则是Deep Web信息检索的基础.该论文综合论述了Deep Web信息集成的研究概况,重点分析了结构化Deep Web分类的主要方法和存在的主要问题,并且讨论了解决这些问题的可能方法;最后对未来工作进行展望.     

Deep Web查询接口自动识别方法

获取Deep Web中信息的主要途径是通过在其提供的查询接口上提交查询来获得,自动识别Deep Web查询接口是Deep Web数据集成系统中需要解决的一个关键问题.通过提取适当的表单结构特征,采用C4.5决策树和朴素贝叶斯相结合的分类算法实现对Deep Web查询接口的自动识别,实验验证了该方案的有效性.     

Deep-Web搜索引擎实现技术研究

Internet的发展,为我们提供了海量的信息资源,但由于Web的复杂性,目前传统的搜索引擎只能检索出其中一部分信息.大量的隐藏信息对这些搜索引擎是不可见的.这些信息隐藏在Web页面的搜索表单中,存在于大型的数据库.用户必须通过查询其后端的数据库才能获得这些Deep Web信息.首先介绍了Deep Web引擎的一般原理,列举了目前Deep Web的流行技术,以及Deep Web搜索引擎的研究现状,并给出了Deep Web搜索引擎的完整实现内容框架,同时探讨了数据库自动发现、数据库自动选择、返回结果自动抽取、结果聚合等4个实现Deep Web搜索引擎的关键技术.     

基于Deep Web 的地图搜索系统的研究与实现

针对传统搜索方式和查询界面的不足，提出了基于Deep Web 的地图搜索系统框架，前台采用活动地图与用户进行交互，后台采用领域本体和Deep Web 爬虫进行识别和相关信息的收集。此系统应用于与地理位置相关的主题信息类网站，使用户能够直观便捷地搜索到所需的信息，提出了一种信息搜索的新思路。     

基于XQuery的Deep Web搜索系统的设计与实现

随着Web技术的发展,越来越多的信息需要通过Deep Web来获取,爬虫搜索系统是完成Deep Web搜索的重要技术手段。提出一种基于XPath的Web搜索系统的设计方法,它通过采集URL目标,分析目标URL的Web结构,维护URL本体知识库,达到深度积累页面的目的。     

Deep Web爬虫研究与设计

随着Web的发展,越来越多的数据可以通过表单提交来获取,这些表单提交所产生信息是由Deep Web后台数据库动态产生的.在这种情况下,信息集成就更加需要Web爬虫来自动获取这些页面以进一步地处理数据.为了帮助用户完成这样的任务,提出一种用于搜集Deep Web页面的爬虫的设计方法.此方法使用一个预定义的领域本体知识库来识别这些页面的内容,同时利用一些来自Web站点的导航模式来识别自动填写表单时所需进行的路径导航.通过对来自不同领域的Deep Web站点的大量实验,验证了此方法是非常有效的.     

基于XML Schema的Deep Web查询接口分类研究

Deep Web在线数据库蕴含大量的信息,但由于这些信息检索困难,利用率不高,本文提出一种基于XML Schema的查询接口分类方法,建立数据查询接口的XML Schema文档,通过各数据源名的语言学相似度实现查询接口的初次分类;根据查询接口标签属性,建立特征-接口向量空间模型实现查询接口向量化,再采用KNN算法进行二次分类,减少KNN算法分类带来的计算开销,提高Deep Web数据检索的效率。     

基于Apriori算法的Deep Web网页关系挖掘研究

利用Apriori算法对Deep Web网站中最大频繁关联关系网页进行识别,并对非最大频繁项网页进行剪枝,再遍历Deep Web网站网页,从而获取所有最大频繁关联关系网页。对某房地产Deep Web网站的实验结果验证了该算法的可行性和有效性。     

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.     

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.     

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.     

A computer generator for randomly layered structures

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

An Index mechanism for multi-scale view in spatial databases

There are numerous geometric objects stored in the spatial databases. An importance function in a spatial database is that users can browse the geometric objects as a map efficiently. Thus the spatial database should display the geometric objects users concern about swiftly onto the display window. This process includes two operations:retrieve data from database and then draw them onto screen. Accordingly, to improve the efficiency, we should try to reduce time of both retrieving object and displaying them. The former can be achieved with the aid of spatial index such as R-tree, the latter require to simplify the objects. Simplification means that objects are shown with sufficient but not with unnecessary detail which depend on the scale of browse. So the major problem is how to retrieve data at different detail level efficiently. This paper introduces the implementation of a multi-scale index in the spatial database SISP (Spatial Information Shared Platform) which is generalized from R-tree. The difference between the generalization and the R-tree lies on two facets: One is that every node and geometric object in the generalization is assigned with a importance value which denote the importance of them, and every vertex in the objects are assigned with a importance value,too. The importance value can be use to decide which data should be retrieve from disk in a query. The other difference is that geometric objects in the generalization are divided into one or more sub-blocks, and vertexes are total ordered by their importance value. With the help of the generalized R-tree, one can easily retrieve data at different detail levels.Some experiments are performed on real-life data to evaluate the performance of solutions that separately use normal spatial index and multi-scale spatial index. The results show that the solution using multi-scale index in SISP is satisfying.     

Jane Eyre——A Feminist In The 19th Century

In the 19th century the society was controlled by men, and women were just appendants of them, they had not any rights and freedom. But Jane was an exception, she showed some characteristics of early feminist. Jane showed her characteristics of feminism in three aspects: rebellion, equality, and independence. These characteristics were helpful to her success, and feminism is the only way out for women of that time.     

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-