符合XPDL规范的工作流系统设计与开发

分析了工作流在PDM系统中的作用,基于XPDL规范和元模型设计方法,进行工作流系统的设计和开发。通过设计合理的工作流引擎,元模型的定义,实现工作流模板定义、工作流引擎服务、流程启动界面、任务箱、流程监控等流程管理功能。最后通过案例介绍了工作流系统在实际中的应用。     

面向服务的工作流管理系统研究

为降低系统内部的耦合度,依据工作流管理联盟提出的参考模型,结合面向服务的思想,提出了面向服务的工作流管理系统体系结构.详细设计了数据层中的流程定义工具,以及服务层中的工作流引擎、服务代理中间件和管理监控工具.将服务引入到工作流管理系统中,实现系统内部协作,给出了服务代理中间件模型,并分析了该模型的作用及应用过程.开发的原型系统成功应用于中国医科大学附属盛京医院办公自动化系统中,通过门诊患者诊断实例的分析,证明了该设计方案的可行性.     

中小企业PDM系统中WFMS的设计与实现

在分析工作流管理联盟提出的通用工作流系统产品实现模型的基础上,提出了一个符合中小企业特点的工作流参考模型,并给出了基于J2EE的系统结构。使用VML实现了基于浏览器的流程自定义工具,采用XML对工作流程模板进行定义。设计出系统的数据库物理模型,并以此为基础实现了该系统的工作流引擎,最后探讨了在该引擎下系统具体的运作过程。     

支持动态联盟的工作流系统研究

分析了动态联盟特性及其对工作流系统柔性方面的具体要求，归纳出柔性的两个方面，即柔性流程建模和系统柔性执行，并提出了抽象建模方法。该方法描述各个业务的共同部分，在流程运行中定义流程的抽象模型、临时路径、节点及连接弧、节点类型和实例，具有很好的柔性。并提出了一个柔性工作流系统的体系结构，该结构支持图形流程定义、动态修改工具、实例管理器、活动调度服务、任务表单引擎和流程监控服务等。     

Activiti引擎的无状态云工作流调度算法

业务流程请求的执行需要工作流引擎解析流程定义文档,构建内存流程模型,而当前无状态云工作流调度没有考虑流程模型在引擎内存上的分布,导致引擎重复解析流程文档,造成系统性能下降。鉴于此,以无状态工作流引擎Activiti为研究对象,根据Activiti引擎流程模型缓存机制,提出一种无状态云工作流流程实例任务请求的调度算法,使得同一流程定义下的请求尽量分配到少数引擎。仿真对比实验结果表明,该算法在实现了引擎实例负载均衡的前提下,通过提高引擎的缓存命中率,减少了数据库查询次数和流程定义文档解析次数,从而减少了请求响应时间,节约了云上资源。     

基于Web Services技术的科技管理工作流系统设计

本文针对科技管理工作开展了一些研究,结合科技管理工作自身的一些特点,运用WebServices技术和工作流技术,设计了一个科技管理工作流管理原型系统。本文描述了科技管理工作流系统特点,把Web Services技术和工作流技术引入到科技管理工作中来,构建了一个Web Services和工作流相结合的组合模型,并对传统的工作流引擎进行了扩展,阐述了基于Web Service的工作流引擎功能体系结构,基于该组合模型完成了工作流引擎的执行,同时介绍了工作流模型和Web服务两者的对应方法。     

基于WEB分布式工作流管理系统的研究与开发

敏捷制造、业务过程重建都强调在信息集成的基础上实现过程集成与优化,采用工作流管理技术可以实现对业务过程的管理和监控。本语文提出了在ＷＥＢ环境下采用ＤＣＯＭ（分布式组件对象模型）技术及三层构架,通过工作流引擎来管理流程的任务分发,引擎控制器操纵引擎的服务,从而实现寒带的工作流管理功能。     

一种高效工作流引擎设计

针对目前工作流引擎效率不高的问题,从实用的角度出发,提出了一个基于事件驱动的高效工作流引擎设计方法。以组件技术为基础,内存列表变量为数据存储对象,基于事件驱动,设计了一个容纳组件的工作流引擎容器,为工作流的高效运转提供了一个支撑平台,提高引擎对数据的访问速度和系统的运行效率,尤其是提高工作流管理系统可靠性及其在处理大规模复杂的且具有并行业务的流程方面的能力。该引擎操作简便、安全稳定、易于维护和移植,上线近一年来,数据量已达百万级,运行情况良好,在实际应用中得到了检验。     

可视化工作流管理系统的设计与开发

工作流技术是目前发展比较迅速的一项应用于企业业务流程的技术，本文从工作流系统的需求出发，突出了可视化图形操作界面和基于XML的模型存储机制等系统特色，并简要介绍了可视化工作流管理系统的框架搭建、流程定义以及引擎调用等开发环节。     

工作流技术在制造执行系统中的应用

基于工作流的制造执行系统(MES)开发,在传统关系数据库基础上,通过工作流引擎驱动MES业务流程,实现MES过程的动态建模和功能配置.分析并建立MES流程实现接口与流程开发,并讨论了工作流引擎支持车间任务的分配机制和运行机制,将生产过程、设备状态、物料生产信息和工作任务有效结合.     

Minimal Realization of Linear Graph Models for Multi-physics Systems

An engineering system may consist of several different types of components,belonging to such physical"domains"as mechanical,electrical,fluid,and thermal.It is t...     

INTEGRAL EQUATION METHOD＇S APPLICATION IN HOLE-EDGE STRESS OF COMPOSITE MATERIAL PLATE WITH DIFFERENT SHAPED HOLES

The strength of composite plate with different hole-shapes is always one of the most important but complicated issues in the application of the composite material. The holes will lead to mutations and discontinuity to the structure. So the hole-edge stress concentration is always a serious phenomenon. And the phenomenon makes the structure strength decrease very quickly to form dangerous weak points. Most partial damage begins from these weak points. According to the complex variable functions theory, the accurate boundary condition of composite plate with different hole-shapes is founded by conformal mapping method to settle the boundary condition problem of complex hole-shapes. Composite plate with commonly hole-shapes in engineering is studied by several complex variable stress fimction. The boundary integral equations are founded based on exact boundary conditions. Then the exact hole-edge stress analytic solution of composite plate with rectangle holes and wing manholes is resolved. Both of offset axis loadings and its influences on the stress concentration coefficient of the hole-edge are discussed. And comparisons of different loads along various offset axis on the hole-edge stress distribution of orthotropic plate with rectangle hole or wing manhole are made. It can be concluded that hole-edge with continuous variable curvatures might help to decrease the stress concentration coefficient; and smaller angle of outer load and fiber can decrease the stress peak value.     

Non-monotonic material contrast in scanning ion and scanning electron images

30 keV Ga⁺ focused ion beam induced secondary electron (iSE) imaging was used to determine the relative contrast between several materials. The iSE signal compared from C, Si, Al, Ti, Cr, Ni, Cu, Mo, Ag, and W metal layers does not decrease with an increase in target atomic number Z₂, and shows a non-monotonic relationship between contrast and Z₂. The non-monotonic relationship is attributed to periodic fluctuations of the stopping power and sputter yield inherent to the ion–solid interactions. In addition, material contrast from electron-induced secondary electron (eSE) and backscattered electron (BSE) images using scanning electron microscopy (SEM) also shows non-monotonic contrast as a function of Z₂, following the periodic behavior of the stopping power for electron–solid interactions. A comparison of the iSE and eSE results shows similar relative contrast between the metal layers, and not complementary contrast as conventionally understood. These similarities in the contrast behavior can be attributed to similarities in the periodic and non-monotonic function defined by incident particle–solid interaction theory.     

Application of Feature Extraction through Convolution Neural Networks and SVM Classifier for Robust Grading of Apples

This paper proposes a novel grading method of apples,in an automated grading device that uses convolutional neural networks to extract the size,color,texture,an...     

分布动态载荷识别的抗噪处理

针对正交多项式频域法在用多种响应对矩形薄板进行载荷识别中抗噪性较差的问题,综合运用平均法、矩阵预处理和奇异值截断法等方法对之进行改善,并引入空间映射的思想,将该方法的应用范围拓展为复杂的模型.利用仿真算例,证实了该方法具有较好的抗噪性.     

基于MELTAC-N平台的核电厂安全级DCS环网研究与测试

针对工程实践中环网通讯相关问题的处理缺乏理论基础及国产化安全级DCS平台的开发缺乏成熟经验借鉴问题,对基于MELTAC-N平台核电厂安全级DCS环网的软硬件实现进行了研究。提出了安全级DCS环网双环网冗余设计、光切换开关设计等硬件设计方法,以及以RPR协议为基础,采用全数据收发策略的软件设计方法。在CPR1000安全级DCS平台上对安全级DCS环网的可靠性及实时性进行了评价,并进行了容错能力、响应时间及响应时间稳定性测试验证实验。结果表明,基于MELTAC-N平台安全级DCS环网软硬件设计具有较好的容错能力及响应时间稳定性。     

Short-Term Relay Quality Prediction Algorithm Based on Long and Short-Term Memory

The fraction defective of semi-finished products is predicted to optimize the process of relay production lines, by which production quality and productivity ar...     

End-to-End Multiview Gesture Recognition for Autonomous Car Parking System

The use of hand gestures can be the most intuitive human-machine interaction medium.The early approaches for hand gesture recognition used device-based methods....     

The laboratory simulation of abrasive wear

Abrasive wear has long been recognised as one of the most potentially serious tribological problems facing the operators of many types of plant and machinery; several industrial surveys have indicated that wear by abrasion can be responsible for more than 50% of unscheduled machine and plant stoppages. Locating the operating point of a tribological contact in an appropriate operational ‚map’︁ can provide a useful guide to the likely nature and origins of the surface degradation experienced in use, though care must be exercised in choosing the most suitable parameters for the axes of the plot. Laboratory testing of materials and simulations of machine contacts are carried out for a number of purposes; at one level for the very practical aims of ranking candidate materials or surface hardening treatments in order of their wear resistance, or in an attempt to predict wear lives under field conditions. More fundamentally, tests may be aimed at elucidating the essential physical mechanisms of surface damage and loss, with the longer term aim of building an analytical and predictive model of the wear process itself. In many cases, component surface damage is brought about by the ingress of hard, particulate matter into machine bearing or sealing clearances. These may be running dry although, more usually, a lubricant or service fluid is present at the interface. A number of standardised wear test geometries and procedures have been established for both two- and three-body wear situations, and these are briefly described. Although abrasive wear is often modelled as following an ‚Archard’︁ equation (i.e. a linear increase in material loss with both load and time, and an inverse dependence on specimen hardness) both industrial experience and laboratory tests of particularly lubricated contacts show that this is not always the case: increasing the hardness differential in an abrasively contaminated lubricated pair may not always reduce the rate of damage to the harder surface.     

ANGULAR DISTORTION ALLOWABLE VALUE AND ASSESS METHOD OF WELD ON COKE TOWER

A graph as the new engineering method for estimate the safety of bulging deformation of coke tower is proposed. Through stresses analysis of circumferential weld of coke tower and comparing the stresses produced by pressure with heat stress of steady state, residual stress, bending stress produced by both itself weight and wind loads, it showed that the stresses produced by pressure on the angle distortion are the main factor of equivalent stress of the combined stress. After comparing four kinds of stress controlling conditions, the relation to stress with depth of angular distortion, grade of curvature of angular distortion and half of region of angular distortion has been inferred. Graph of deformation allowable value of coke tower for different condition by angular distortion and half of region of angular distortion has been plotted. The five steps for its engineering use have been explained. The lighter the grade of curvature is, the larger of bulge allowance, may be, and the bigger of depth of angular distortion may pose too. For the coke tower with a popular structure of Dg 5 400 mm×28 mm, the result by graph is nearly more than the result of two formulas formed by other research, the error is less than 7.0%. But, the graph can be easily applied to different size of angular distortion.