物理数据模型(PDM)的优化思想与方法

数据建模技术目前在软件工程领域中的地位已经得到广泛的承认,随着越来越多CASE(计算机辅助软件工程)工具的推广与使用,数据建模技术必然推动软件工程学科快速发展。本文主要介绍在建立数据模型过程中为了提高目标数据系统的系统性能,在建立模型阶段对物理数据模型进行优化的思想与手段,结合一个模型实例,通过对模型进行水平分割、垂直分割、打碎关系和列的非范式化操作,实现数据模型的性能优化。     

虚拟企业集成模型的形式化方法

为开发正确、可靠、基于模型驱动的虚拟企业信息系统 ,满足虚拟企业对于可伸缩性、可重构性、可重用性以及互操作性的要求 ,在虚拟企业建模与开发过程中引入形式化RAISE (工业软件工程严格方法 ) ,分析了在虚拟企业组建中应用形式化方法的优点 ,讨论了 RAISE与有着广泛应用的传统 IDEF(集成计算机辅助制造定义方法 )的结合 ,并给出了运用形式化方法进行虚拟企业建模的方案。该方法是虚拟企业建模与实现技术的重要研究方向     

基于MDA技术开发企业费用管理系统

模型驱动体系架构MDA是OMG组织推出的一种新的软件开发方法。MDA的核心思想是抽象和自动变换，MDA以模型为中心，将高抽象甚次模型逐步变换成为低抽象层次模型，并最终转化成具有基本功能的可执行的代码。MDA工具的使用将会大大提高软件开发的效牢和软件的质量，本文描述了我们实现的一个MDA工具，以及以此工具开发费用管理系统的实践过程以及经验总结。     

信息服务的需求获取与建模研究一般性科技报告

研究目前在以下方面取得了研究进展。首先,在信息服务的需求获取及协同优化方面:(1)完善了面向特征领域分析的需求获取方法;(2)完善了基于目标场景的用例驱动需求获取方法;(3)研究了协同分析与优化方法,同时开发了相应的支撑工具。其次,在信息服务的建模与模型演化方面:(1)研究了基于Petri网的建模和模型演化理论与方法,同时开发了相应的支撑工具;(2)研究了基于进程代数的建模与模型演化理论与方法。最后,在信息服务模型的形式化验证与确认方面:(1)研究了基于模型的测试理论与方法,并开发了相应的模型测试工具;(2)研究了基于PPTL的符号和限界模型检测理论与方法,并开发了相应的模型检测器;(3)完善了基于MSVL的仿真理论与方法,并开发了相应的支撑工具MSV;(4)研究了基于抽象精化的模型检测理论与方法,并开发了相应的支撑工具。     

软件工程及其开发环境

本文研究了软件工程中的各种技术和方法,探讨了计算机辅助软件工程(CASE)和软件工程环境的研究状况,并且介绍了一个基于面向对象技术的集成化软件工程开发环境“青鸟”系统。     

基于SOA的办公系统设计策略

面向服务架构(SOA)是软件工程领域的最新发展方向,使用SOA整合各种资源,实现最大程度的软件复用,利用SOA架构的这一优势,结合BS模式设计了一个办公系统的设计模型.     

基于软件复用的生产线方法

提出了一种开发和维护系列软件系统的生产线方法,与分析、设计和实现单个软件系统的传统软件工程方法不同,该方法是一种领域特有的、以体系结构为中心的、过程驱动的、基于技术与复用的系统化方法,重点探讨了复用的方法论、生产线、工具和技术.     

基于软件复用的生产线方法

提出了一种开发和维护系列软件系统的生产线方法,与分析、设计和实现单个软件系统的传统软件工程方法不同,该方法是一种领域特有的、以体系结构为中心的、过程驱动的、基于技术与复用的系统化方法,重点探讨了复用的方法论、生产线、工具和技术。     

Windows2000设备驱动程序的设计与开发

在分析Windows设备驱动模型(WDM)的基本结构、设计和开发等基本问题的基础上，采用WDM技术设计开发了体外反搏辅助循环装置的软件系统．该系统在临床实验中运行稳定，实现了实时、高速、多通道I／O设备驱动，较好地满足了系统(用户)对I／O设备的管理。     

面向服务架构的电力分布式计算系统模型

基于进程通信的电力分布式计算模型满足了电力企业利用电力分布式计算理论对电网安全经济运行情况做出实时监测和分析计算的实际需求,但存在公有基础功能开发复杂性高、系统可扩展性不足等问题。设计并实现了一种基于面向服务架构的电力分布式计算系统模型。运用软件设计模式设计了低耦合、可扩展的系统框架,设计使用Windows通信基础(Windows Communication Foundation,WCF)技术实现面向服务的分布式数据通信,使用Windows工作流基础(Windows Workflow Foundation,WWF)技术可视化地实现电力分布式计算中的各种业务逻辑和计算流程,并结合ADO.NET数据库访问技术实现异构数据的集成。面向服务的系统模型架构提高了系统的可集成性和可扩展性,WCF和WWF技术的使用降低了分布式计算系统开发的复杂性。     

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-