基于工作流的MDA开发方法

介绍了目前流行的MDA(模型驱动架构)的基本开发原理,指出了MDA在业务模型的开发及业务逻辑代码的生成上存在的诸多困难。然后从工作流技术入手,详细分析了XPDL(XML过程定义语言),并将工作流在业务描述方面的成熟技术应用到现在的MDA业务开发中,最后基于这种工作流技术的思想,描述了如何利用MDA实现一个特定平台下的开发。     

网络化制造平台动态工作流管理模型研究

工作流技术能否有效地管理业务过程是网络化制造平台成功实施的关键问题。在分析了网络化制造平台中存在既定业务过程经常变动,业务活动之间信息交互通信量与通信资源之间存在矛盾等问题的基础上,提出了一种基于对等网络和统一描述、发现和集成协议的网络化制造平台动态工作流管理模型。重点阐述了该模型基于统一描述、发现和集成协议的工作流端目录管理服务、工作流服务端和端通知机制。最后,通过网络化制造平台工作流管理系统的企业实际应用对该模型进行了验证。     

工作流模型时间有界性验证与分析研究

对工作流模型分析进行了层次划分后，提出了工程流模型时间有界性的问题，从完成工作流管理联盟给出的工作流图形化模型向工作流网的模型映射之后，利用绝大多数描述业务过程的工作流模型都具有自由选择性的特点，提出了一种将映射得到的自由选择工作流网分解为一组变迁组件网的分解算法，在此基础上，结合工作流模型的资源视图，详细阐述了基于Petri网理论的工作流模型时间有界性分析与验证方法。     

基于活动网络图的面向扩展的工作流过程模型

工作流过程模型对企业业务过程进行抽象表示,作为工作流模型的核心,它已成为当前工作流建模研究的重点。为了解决现有活动网络图建模方法对状态和条件描述能力差的问题,在模型中增加了条件约束,引进了"状态"和"条件",提出了一种基于活动网络图的面向扩展的工作流过程模型。研究结果表明,这种模型在提高模型描述能力、降低模型复杂性、提高系统柔性及适应性方面有明显优点,对于设计开发高可靠性、柔性和适应性的工作流管理系统具有重要的应用价值。     

基于本体的工作流管理技术的研究

分析了本体技术在工作流模型中应用的优势,针对当前工作流技术需要进一步探索和研究的工作流统一模型方面,讨论了工作流模型中组织、资源和过程等本体模型的描述和实现,开发了基于本体的产品数字化协同设计与制造系统。实际应用表明,基于本体的工作流模型解决了普通工作流模型中存在的问题,取得了较好的效果。     

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。     

制造网格中基于服务的工作流研究

为了实现制造网格平台中业务流程的构建、执行和管理监控，分析了制造网格环境下工作流的特点，在传统的工作流框架上进行扩充，提出了制造网格工作流框架和基于服务的抽象工作流模型。根据工作流查找和绑定服务的时机，将工作流分为服务模型建立、服务发现、服务绑定和服务调用4个阶段。根据工作流抽象模型中活动说明的服务质量需求和服务描述中的服务质量（QoS）属性，选用不同的服务发现策略，使同一个活动的不同实例能够绑定不同的服务，提高了制造网格工作流的柔性和自适应性。结合一个实例予以了验证。     

遵循MDA理念的业务建模技术

为了有效地将业务和底层技术进行分离,提高开发效率,ADP平台提供了遵循MDA理念的业务建模技术。首先对传统软件研发模式存在的问题进行了剖析,接着对MDA核心理念进行了描述,并阐述了采用MDA软件研发方法学对传统软件研发模式进行改进的过程,提出了基于MDA理念的业务建模整体框架,最后讨论了业务建模给开发团队带来的价值。     

支持BPR的工作流动态模型实现技术

设计并实现了一种支持企业经营过程重组（BPR）的工作流管理系统，给出了系统的结构和工作流模型的动态实现技术，文中通过对工作流实例的结构进行动态改变，实现了动态的工作流模型，从而在工作流管理系统中提供了对企业经营重组的支持，为BPR的实际应用提供了支撑环境。     

遵循MDA理念的业务建模技术

为了有效地将业务和底层技术进行分离,提高开发效率,ADP平台提供了遵循MDA理念的业务建模技术.首先对传统软件研发模式存在的问题进行了剖析,接着对MDA核心理念进行了描述,并阐述了采用MDA软件研发方法学对传统软件研发模式进行改进的过程,提出了基于MDA理念的业务建模整体框架,最后讨论了业务建模给开发团队带来的价值.     

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.     

Limits of topographic measurement by the scanning tunnelling and atomic force microscopes

Parameters describing the topographic character of a surface (height, surface wavelength, slope and curvature) can be derived from equivalent sinusoidal profiles. The response of a surface-measuring instrument may be modelled in terms of instrument parameters such as stylus radius, and scanning range and resolution. The performance of the instrument may then be mapped as a zone in amplitude-wavelength (AW) space to show the sinusoidal profiles it is capable of measuring. In a first-order analysis the STM and AFM are considered as equivalent to contact-stylus instruments with a notional stylus radius equal to the tip radius plus the gap. Comparisons between different instruments and types of instrument are readily made by mapping in AW space. The error arising from convolution of the sinusoidal profile with that of the finite tip may be quantified and plotted as contours in AW space.