无序档案资料整理的工作流网模型

工作流是实际业务工作流程的形式化表示,其关键在于建模.由于Petri网构建的工作流模型具有简单明了的特点,因而成为的重要建模工具.在Petri网和工作流理论的基础上,把一个实际的任务分解为工作流,并对该工作流构建工作流网模型.最后,对所建模型的正确性进行了定性的分析,并对模型的特性和所反映的问题进行了讨论,说明了利用Petri网技术来为实际业务流程建模的合理性和优越性.     

无序档案资料整理的工作流网模型

工作流是实际业务工作流程的形式化表示,其关键在于建模。由于Petri网构建的工作流模型具有简单明了的特点,因而成为的重要建模工具。本文在Petri网和工作流理论的基础上,把一个实际的任务分解为工作流,并对该工作流构建工作流网模型。最后,对所建模型的正确性进行了定性的分析,并对模型的特性和所反映的问题进行了讨论,说明了利用Petri网技术来为实际业务流程建模的合理性和优越性。     

基于Petri网的工作流建模与分析

工作流建模是工作流研究中的关键问题.论文在对当前工作流中的主要路由模型分析的基础上,结合Petri网的结构、形式化定义和流程建模方法,建立了从工作流到Petri网的路由映射模型.通过对贷款处理流程的工作流建模分析表明,基于Petri网的工作流建模方法具有直观、简洁等优点.     

Petri网在OA系统工作流中的应用

Petri网既有严格的数学描述,又有直观的图形表示,是理想的工作流建模工具.本文以OA系统中收发文管理流程为例,提出了一个基于Petri网工作流建模的方法并进行了模型的正确性验证.     

基于Petri网的遥感卫星业务运行管理单元模型设计与仿真

本文首先介绍了Petri网和四种工作流原语向Petri网映射的方法及其性能分析算法;然后通过研究遥感卫星业务运行管理单元的业务运行流程,实现了基于Petri网对遥感卫星业务运行管理单元常规模式和应急模式的工作流程的层次化建模;最后利用Petri网仿真软件Visual Object Net 对常规模式和应急模式的工作流程进行仿真并分析其时间性能。仿真结果表明本文所建立的基于Petri网的工作流模型是正确的,并且业务运行流程在采用应急模式时,业务运行管理单元节省了大约60%的系统运行时间,故该模型运行效果良好。     

真并发等价性下的流程模型转换方法

针对工作流建模过程中流程模型的演化问题,在真并发等价性概念下,提出将图形化控制流模型转换为顺序与并发结构可分隔处理的可分离形式的方法.采用自由选择工作流网建模控制流模型,以完全并发互模拟为真并发等价概念,定义两个安全网间是完全并发互模拟关系的充分条件;基于Petri网的网展开,提出获得工作流网的可分离形式的局部网展开算法;通过证明局部展开网与原工作流网满足完全并发互模拟的充分条件,保证两个网模型的等价性.所提转换方法与已有方法相比,能够保留并发层次,且所需步骤更少,有利于流程模型的演化.     

基于Petri网的集成系统工作流建模的研究

在分析大量实际工作流特征的基础上,总结了实际工作流执行中的路选结构情况,在此基础上改进了WM FC提出的Petri网工作流模型,提出了基于Petri网技术构造工作流模型的FA-PN网(F low A PetriN et)并介绍了使用所建模型构建实际复杂合同评审系统的Petri网工作模型.另外详细阐述了扩展法构建Petri网工作流模型的过程,并提出了模型结构正确的证明方法.最后介绍了一种对模型结构的冲突情况进行仿真分析的仿真法,可用来验证模型的正确性.     

基于扩展库所网的工作流过程规约和模式描述

通过扩展库所的属性, 给出了一种新的Petri网模型,用来规约工作流过程和表示工作流模式,并提出了一种称为参数化模式的新模式。通过区别变迁和工作流路由,使得模型中的库所和变迁能够分别表示引擎的动作和需执行的任务。基于传统的Petri网的工作流模型不适合描述工作流过程所代表的行为,因此提出了ST触发规则表达网模型的语义。     

一种形式化的工作流网模型

提出基于Petri网的形式化的工作流网模型,用Petri分析技术对工作流业务流程的动态行为进行了描述和分析,并给出了详细的建模算法。     

基于面向对象Petri网的供应链工作流建模

供应链工作流需要可动态调整的柔性建模方法,本文将面向对象思想引入Petri网中,结合时延和状态标识,并借用了有色Petri网相关概念,建立基于时延特性的面向对象Petri网(SC-TOOPN).SC-TOOPN使供应链工作流建模更具结构化和动态化的特点,可以为系统提供一种形式化的建模工具.     

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