可视化类库VTK在三维建模中的应用

采用VC＋＋6．0作为开发平台,引入三维可视化类库VTK,实现了散乱数据和体数据的建模．通过数据压缩、平面分割来减少数据量,分别采用不同的建模方法,如Delaunay三角化建模、轮廓线建模、MarchingCubes建模,实现了三维数据的建模．     

基于UML的动态企业建模的研究与实现

应用扩充UML元模型定义企业建模,建立企业工作流视图、功能视图和信息视图．工作流建模,采用状态机(state machine)描述业务流程;功能建模,采用用例图(Use Case diagram)表达功能需求;信息建模,采用类图(class diagram)建立逻辑模型．建立了一个典型的离散型制造企业的企业模型,实现了相应的应用软件框架及动态企业建模在生产管理中的应用．     

基于模糊关联规则与减法聚类的神经模糊建模

针对许多复杂系统的输入变量之间存在的相互关联,提出了一种基于聚类与模糊关联规则的神经模糊建模方法.这种方法采用基于聚类的模糊关联规则挖掘算法来进行输入变量的选择,之后,再采用基于减法聚类的神经模糊建模方法建模.最后,还将这种建模方法应用于实际建模问题,结果表明这种方法在保证模型精度符合建模要求的情况下,减少了模型输入个数,降低了建模的复杂程度.     

基于地面激光扫描技术的建筑物建模研究

三维激光扫描技术在建筑物建模领域发展迅速。以现代建筑为例,从三维数据获取、数据处理、模型建立等方法进行论述,采用七参数模型进行点云拼接,并对拼接后的点云进行去噪和抽稀处理,分析研究2种不同建模方法的特点,一种是三角网格法,另一种是参数化建模方法。最终采用参数化建模方法完成了大型建筑物的建模。实验表明,在建筑物建模中,参数化建模方法更为适用。     

飞控计算机系统分层混合可靠性建模方法

对于复杂的非相似、多余度飞控计算机系统,根据其结构特点,综合静态和动态可靠性建模方法的优势,提出了采用可靠性框图（RBD）和广义随机Petri网（GSPN）相结合的分层混合建模方法,并对建模过程中低层各子系统存在共因失效部件情况下的可靠性建模和求解作了分析.分别采用分层混合建模方法和动态可靠性建模GSPN方法对Boeing777电传主飞控计算机系统进行可靠性建模和分析.同动态GSPN方法相比,该方法综合采用了静态和动态可靠性建模方法,具有状态空间模型的灵活性和组合模型求解的高效性,同时层次结构避免了GSPN方法带来的状态空间爆炸问题.由结果比较可得,该方法可行、高效、精确.     

基于集合论集成的复杂煤层建模

为了解决复杂煤层空间建模困难问题,在深入分析复杂煤层建模机制基础上,采用集合论集成的方法和思想,研究了煤层建模方法。结果表明:通过采用集合论集成的数据模型可将空间地质体分为五大部分,九种相应的数据结构类型,同时设计并研发出地质体建模模拟系统。通过断层和巷道为例进行验证,得出该建模方法实用可行,并能够有效提高建模速度和精度的结论。该结果对地质体建模具有一定参考价值和借鉴作用。     

UML在多层分布式系统建模中的应用

UML统一建模语言已受到工程界广泛的关注，但采用UML对多层分布式应用系统进行建模没有统一的标准，本文介绍在工程实践中采用的建模方法，并采用UML为多层分布式系统建模，该方法已在工程应用中取得较好的效果。     

ORM数据库建模方法及其与传统方法的比较

介绍了数据库建模的几种方法，以某小型企业信息管理系统中采购业务为实例将传统的E-R建模方法与全新的ORM数据建模方法相比较，通过分析总结出在小型企业信息管理系统中采用ORM方法建模的优越性．     

基于MultiGen Creator的综采工作面VR场景模型建立

MultiGen Creator是一个专业的VR场景建模工具,用于交互式实时仿真模型的建立。本文首先介绍了建立VR场景通常采用的建模方法,结合综采工作面的特点,以采煤机和液压支架模型的建立为例,给出了建模的步骤,讨论建模过程中存在的问题,总结了建模的规律和技巧。     

流域三维虚拟环境建模方法研究

三维虚拟环境建模是实现流域三维仿真模拟的关键环节,建模方式的合适与否将直接影响仿真模拟的效果.结合都江堰工程区域建模研究了流域虚拟环境重点实体和普通环境实体的建模方法与流程,重点实体建模以基于几何的建模方法为主,采用纹理映射技术和细节层次技术解决模型建模量与渲染量之间的矛盾.普通环境实体建模以基于纹理图像的建模方法为主,结合模型实例化技术解决建模量与内存占用问题.为优化场景建模,提出了模型结构调整的基本原则,讨论了基于外部参考的模型场景存储方式的优缺点.     

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.     

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.     

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     

On the Thermodynamic Limit for Responses to Static Electromagnetic Fields

For molecular systems,the quantum-mechanical treatment of their responses to static electromagnetic fields usually employs a scalar-potential treatment of the electric field and a vector-potential treatment of the magnetic field.Although the potential for each field separately is associated with the choice of an(unphysical)origin,the precise choice of the origin for the electrostatic field has little consequences for the results.This is different for the     

Call for Papers

<正>"The Journal of Shanghai Normal University:Mathematics"is published by Shanghai Normal University as regular issues of The Journal of Shanghai Normal University each year from 2014 in English.The editors-in-chief of the issues are professors Yuhao Cong and Maoan Han.The Journal of Shanghai Normal University was started in 1958 with     

Journal of Donghua University ( English Edition) Contents of Volume 31

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