基于Petri网的工作流技术在信息系统中的应用

以某汽车零配件供应商开发的产品数据管理系统PDM-flow为研究背景,分别介绍了基于工作流技术的信息系统的体系结构、各组成部分的实现方法、系统开发模式以及使用Petri网设计业务过程的一些经验。系统体系结构借鉴了国际工作流管理联盟的(WFMC)工作流参考模型,以工作流引擎系统JBPM为核心构件实现了工作流管理系统的各个组成部分,希望对工作流技术和Petri网技术的使用以及实现类似系统有一定的借鉴作用。     

基于工作流技术MIS系统的分析与设计

运用Petri网工具对工作流技术进行了详细的分析与描述,并结合MIS系统开发的实际,对工作流技术在MIS系统中的应用进行了Petri网分析,最后春出了工作流的管理和控制模式以及分布式MIS系统中工作流技术的实现形式,实践证明,工作流技术既有助于系统的分析与设计,又方便了用用户的使用,从而大大提高了系统的性能。     

工作流技术及Petri网在教育管理软件建模中的分析及应用

为了实现教育管理中的各个组织部门间的协调工作,提出了在教育管理软件中引入工作流技术作为建模开发的基础,工作流技术是一种协同技术,能理想完成教育管理软件开发中业务流程的建模和业务逻辑的实现,而工作流描述需要一种工作流模型来支持;Petri网是一种适合于描述异步并发现象的系统模型,适合对业务流程建模,结合用Petri网对业务流程进行建模的方法探讨了如何在教育管理软件建模中应用工作流技术。     

基于Petri网的研究生培养工作流模型

工作流技术作为实现过程集成管理的有效手段,广泛应用于各种场合,Petri网是一种适合于描述异步并发现象的系统模型,它既有严格的数学定义,又有直观的图形表示,该文简要介绍了工作流、工作流模型以及Petri网的理论,然后对研究生培养过程进行了基于Petri网的模型设计,并对模型进行了化简和合理性证明,结果表明,利用Petri网能够对研究生培养过程进行建模和优化设计。     

基于Petri网的工作流建模的研究

工作流技术作为实现企业过程的有效手段,广泛应用于各种场合.在应用中,关键是建立适合企业过程的工作流模型.Petri网是一种适合于描述异步并发现象的系统模型,它既有严格的数学定义,又有直观的图形表示.本文主要介绍了Petri网和工作流模型的理论,以及基于Petri网的工作流建模方法,并给出了设计实例.     

基于Petri网的工作流并行算法的研究

为了模拟企业工作流的业务流程,实现企业业务过程的自动执行和监控,提出了一种新的工作流Petri网模型及其并行算法。(1)根据工作流系统和Petri网模型的特点,给出了工作流模型与Petri网的映射关系;(2)对基于Petri网模型的四种工作流网基本模型进行并行性分析,提出了一种新的工作流Petri网并行模型;(3)结合Petri网并行划分算法和新的模型进行融合与优化,提出一种新的工作流并行优化算法;(4)以应用实例对工作流并行优化算法进行验算与分析。结果表明,新的工作流Petri网模型及其并行算法可行有效。     

基于Petri网的人才评价工作流模型

提出了基于Petri网的人才评价工作流管理系统建模的应用研究,介绍工作流、工作流网、工作流建模的一些基本概念,以及用Petri网对工作流进行建模的过程,并结合人才评价系统实例讨论了基于Petri网的工作流模型的有效性和性能分析。     

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Petri网的保险工作流系统建模及验证

提出基于Petri网的工作流系统业务模型.该模型将Petri网的理论和性质应用于业务工作流系统当中,从系统的运行过程和形式化的图形描述方式两方面实现对工作流系统的快速建模和分析.通过工作流Petri网的语义性质,对所建立的中国人民保险公司的索赔业务工作流系统模型的正确性进行验证和分析,表明此模型有较好的应用效果.     

PDMS的工作流技术研究

提出了用非格式化数据库Domino和关系数据库构建PDMS并实现Intran/Internet环境下加工系统工作流的算法,该系统综合了基于Petri网的工作流建模方法和OLE技术,原型系统验证了生产工作流的算法的正确性。     

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.     

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.     

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.     

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.     

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.     

橡胶颗粒沥青混合料低温抗裂性试验研究

以AC-13级配为基础,将橡胶颗粒代替部分集料掺入混合料中,以低温弯曲试验为评价方法对不同橡胶颗粒掺量下沥青混合料的低温抗裂性进行研究,并引入应变能密度值对混合料的低温抗裂性进行综合评价.试验结果表明:橡胶颗粒沥青混合料试件的破坏微应变均超过2 300,满足冬寒区的技术指标;无论是否掺加橡胶颗粒,随着温度的下降,沥青混合料破坏时的最大弯拉强度增大,弯拉应变降低,劲度模量增大;弯曲应变能密度在胶粒掺量为1%左右时具有较大的弯曲应变能密度值,此时橡胶颗粒沥青混合料具有较好的低温抗裂性.     

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。     

Quantitative trait loci （QTLs） for quality traits related to protein and starch in wheat

Quality traits in wheat （Triticum aestirum L.） were studied by quantitative trait locus （QTL） analysis in a recombinant inbred line （RIL） population, a set of 131 lines derived from Chuan 35050 × Shannong 483 cross （ChSh）. Grains from RILs were assayed for 21 quality traits related to protein and starch. A total of 35 putative QTLs for 19 traits with a single QTL explaining 7.99-40.52% of phenotypic variations were detected on 10 chromosomes, 1D, 2A, 2D, 3B, 3D, 5A, 6A, 6B, 6D, and 7B. The additive effects of 30 QTLs were positive, contributed by Chuan 35050, the remaining 5 QTLs were negative with the additive effect contributed by Shannong 483. For protein traits, 15 QTLs were obtained and most of them were located on chromosomes 1 D, 3B and 6D, while 20 QTLs for starch traits were detected and most of them were located on chromosomes 3D, 6B and 7B. Only 7 QTLs for protein and starch traits were co-located in three regions on chromosomes 1D, 2A and 2D. These protein and starch trait QTLs showed a distinct distribution pattern in certain regions and chromosomes. Twenty-two QTLs were clustered in 6 regions of 5 chromosomes. Two QTL clusters for protein traits were located on chromosomes 1D and 3B, respectively, three clusters for starch traits on chromosomes 3D, 6B and 7B, and one cluster including protein and starch traits on chromosome 1D.     

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.