柔性工作流元模型及应用

随着企业竞争的加剧和政府对提高工作效率的迫切需要,工作流的柔性问题成为研究的热点.以元模型为基础,提出了一种实现柔性工作流的方法.以WfMC过程定义元模型为基础,提出了一种支持工作流柔性的元模型.在此基础上,通过引入ECA规则,对工作流中主要元素进行了形式化描述.以实例说明了该模型在实践中的应用.     

柔性的比较性定义和性质

对柔性问题的研究和实际运行面临的一个主要困难是可操作性。为解决柔性操作性问题，在给出柔性基本性质的基础上，提出了柔性的比较性定义，给出了该定义及其性质的数学描述，并结合一些模型解释了柔性定义及性质的应用。     

基于动态规划的柔性工作流

为提高柔性工作流对业务环境不确定性和多变性的响应能力,提出了一种基于流程模式的工作流动态规划技术.采用流程模式的知识表示方法描述业务领域专业知识,工作流建模阶段不确定的执行过程或执行因素用一个特殊的"目标活动"来表示;通过在流程执行过程中实时获取目标活动的上下文信息,实现流程执行过程中的实时规划,使得流程的执行过程能够更加实时地反映外界影响因素的变化;给出了基于动态规划柔性工作流的结构化设计和上下文数据的形式化定义,进而设计了目标匹配的流程规划算法,该算法支持流程的递归规划.最后,给出了一个"接收对象不明确"的工作单分发流程实例,表明了动态规划的优势,并与其他支持工作流柔性的方法进行了比较.     

柔性的比较性定义和性质

对柔性问题的研究和实际运用面临的一个主要困难是可操作性．为解决柔性操作性问题，在给出柔性基本性质的基础上，提出了柔性的比较性定义，给出了该定义及其性质的数学描述，并结合一些模型解释了柔性定义及性质的应用．     

基于WfSL的柔性工作流模型形式化定义

针对传统工作流模型柔性不足的问题,考虑各种动态需求以及流程中的可变因素,使用工作流规格说明语言WfSL对柔性工作流模型进行形式化定义,从而增加了模型定义的柔性,使其可以动态地进行过程、角色、状态和异常定义的修改,实现了工作流的动态性和灵活性。     

基于模型的参数化界面设计模式

为了提高用户界面的开发效率,提出了面向用户的参数化界面设计模式,从模型、展示样式、操作3个方面描述了设计模式,给出了界面设计模式的规范定义.该模式进一步指导了基于模型的用户界面开发,有效地支持了代码的自动生成,提高了界面设计的效率.     

基于规则嵌入赋色Petri网模型的柔性装配系统仿真

针对柔性装配系统复杂的并行作业特点，提出了规则嵌入赋色Petri(RCP)网模型．给出RCP的定义，利用面向对象的语言实现了网的静态描述以及动态运行，在此基础上得到了相关的系统参数，柔性仿真系统以模块化结构实现．以上海科技馆的机器人柔性装配系统为例，给出了它的RCP仿真模型，求出了某作业初始序列下的系统参数，并得到了该作业的最短完成时间的优化序列．     

区间平均运算模型柔性化的研究

用泛逻辑学原理,把广义相关性引入到区间值逻辑,重新定义了柔性区间补、柔性区间与、柔性区间或、柔性区间平均等运算模型,且这些运算模型是连续可变的,还进一步证明了柔性区间平均的中介性、交换律、单调性和边界条件.以全新的观点给出柔性区间平均在h几个特殊点处的运算模型,并绘出其图形.     

管控一体柔性装配线管控策略实验平台研究

管控一体柔性装配线管控策略实验平台是一个研究特定装配线软硬件架构与管控策略的智能平台.文章首先对特定实验对象——管控一体柔性装配线进行定义,再对解析出的柔性装配因子进行分类,并详细阐述了实验平台的构建与运作原理;其次根据实验平台的逻辑架构与功能原理,构建了其软硬件架构体系;最后举例进一步说明实验操作流程,证明了该平台的...     

面向非合作目标的柔性捕获器设计与动力学建模

为更好地实现对动态非合作目标的捕获,设计开发了一种多臂式柔性捕获器.这种捕获器的原理类似海葵等生物捕猎的方式,不依赖单个柔性臂的精准夹持而是靠多根臂所构成的臂群实现聚拢、挤压等动作,以完成对目标物体的捕获.基于能量守恒和动量守恒原理对非合作目标物体与柔性臂的碰撞问题进行分析,给出了发生碰撞后柔性臂与目标物体各自的运动参数.为进一步分析柔性臂的动态变形过程,采用多个线性关节和扭转关节的组合对单根柔性臂进行描述,并基于牛顿法对各离散关节进行受力分析,建立了柔性臂的动力学模型.将柔性臂整个变形过程离散为多个微小时间段运动的集合,通过动力学分析得到当前时刻的动力学参量,经过一个微小时间内的运动后即可得到下一时刻各质点的位置,迭代进行上述步骤便得到了柔性臂的动态变形过程.而后,通过实验确定单臂动力学模型的最优参数,并将参数优化后的动力学模型在不同加载情况下与单臂样机进行对比,验证了动力学模型的准确性.最后,在单臂动力学模型的基础上建立包括多根柔性臂的捕获器三维模型,进行非合作目标捕获的仿真与样机实验.结果表明:所设计的臂群式柔性捕获器能够很好地完成动态非合作目标捕获任务,所建立的捕获器三维仿真模...     

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