数据仓库中数据的粒度划分

数据仓库在决策支持系统(DSS)中起着核心作用,而要创建一个好的数据仓库,构造合适的数据粒度模型是要解决的一个重要问题.通过对数据粒度划分方法的分析,结合实例给出了一个划分粒度级别的新思路,提出了解决不同级别间数据查询效率的基本方法.     

数据仓库及其设计规范化

在严格数据仓库概念基础上,说明了数据仓库与多维数据库之间关系及数据仓库的特性和优势,重点讨论并给出一种规范化的数据仓库设计和粒度模型设计方法,粒度设计在数据仓库建模中十分重要,实质上,它在数据仓库模型设计的一些重要指标间提供了一项交换技术,以保证数据仓库系统结构稳定、存储与访问性能良好,但粒度设计往往凭经验调试完成,根据专家系统技术,提出一种动态粒度划分方法,很好地解决了数据仓库的粒度设计问题。     

使用Decision Cube进行数据的决策分析

从粒度分析的角度出发,对数据仓库、粒度、Delphi 7中提供的Decision Cube决策组件进行了介绍.然后举例说明了如何在数据仓库中按时间段综合数据的粒度以进行决策设计和分析的方法.并对库中的表进行数据决策和图表决策.以便从不同的角度来查看和概括库中的数据.完善整个系统的设计.并对使用Decision Cube这组组件需要注意的问题也进行了总结.     

物流管理数据仓库模型

阐述了数据仓库在物流发展中的重要作用,并且分析比较了数据库和数据仓库在使用过程中的不同作用一根据物流决策分析的要求和数据仓库模型的设计步骤,分别对物流管理数据仓库的主题选择,数据模型、数据粒度进行了详细分析,并且提出物流管理仓库的体系结构及实现.     

银行信贷数据仓库的设计

指出了数据仓库是近年迅速发展起来的一种管理技术，分析了数据仓库的环境及技术特点，论述了数据仓库的环境及技术特点，论述了在银行信贷管理系统中引人数据仓库的必要性，提出了银行信贷数据仓库的设计，对其中的数据模式、数据粒度、数据抽取等进行了探讨。     

粒度计算在数据仓库挖掘中的应用

粒度计算是人工智能领域中的一种新理念和新方法.它主要用于解决海量数据的挖掘和复杂问题的求解.商空间粒度计算方法是结合商空间理论描述问题,并分析求解问题.本文将商空间粒度计算方法应用于对数据仓库中的数据进行粒度分析及相关数据挖掘.     

网上评教及联机分析系统的多维数据集设计

本文首先介绍了网上评教及联机分析系统的关系数据库设计,然后,从为教学管理者提供评教数据分析的角度出发,创建了各种维表和事实表,给出了多维数据雪花模型。并结合评教系统数据仓库的特点,确定了ROLAP的多维数据集存储方式,采用双重粒度级别设计,从而提高了访问效率和节省了存储空间。     

石油运输企业车辆设备管理数据仓库系统设计

传统石油运输企业车辆设备管理系统主要是针对日常事务的管理,难于满足分析和辅助决策的需要.采用数据仓库技术构建了一个石油运输企业车辆设备管理数据仓库系统,分析设计了相应的主题、多维数据结构和多粒度数据组织模型,给出了系统的体系结构和组成模块.系统对企业决策有参考价值.     

时间维在数据仓库中的应用研究

数据仓库的时间维是其固有特性，如何在实际系统中确定不同的时间粒度和控制方式至今仍没有统一的方法。现就对数据仓库的时间维特性进行了分析与总结，提出了在数据仓库中处理时间维的一般原则，并在实际系统构建过程中进行了有益的探索和实践。     

多维数据建模的设计方法

多维数据的建模是企业使用数据仓库的关键技术之一,传统的数据模型（如实体模型和关系模型）不能有效地表示数据仓库中的数据结构和语义,也难以支持OLAP应用.本文提出了多维数据建模的一种优化方法变粒度建模,并介绍用Essbase开发工具实现多维数据建模的过程.通过实验表明,该优化方法能有效提高OLAP响应速度和数据仓库性能.     

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