业务过程执行语言流程语义标注方法研究

为提高工作流模型在分布式执行过程中的自动化程度.解决语义异构问题,提出了一种基于本体的业务过程执行语言语义标注方法,构建了业务工程执行语言流程树和Web本体描述语言领域本体树.针对业务工程执行语言流程中的每个概念,分别从三个角度计算其与Web本体描述语言领域本体中所有概念之问的语义相似度,并选取与该概念复合相似度最大的概念建立映射关系.通过语义消歧过程.消除业务工程执行语言流程中存在的语义异构,并生成语义消歧树,进而基于一系列映射规则,将语义消歧树转化为Web服务本体描述语言描述的语义工作流模型.最后给出应用实例,并采用F1-measure对所提出的语义消歧方法进行评估.     

基于Web的轻量级工作流管理系统

工作流管理针对控制、监控、优化和支持业务过程提出了一种新的解决方案。遵循工作流管理联盟参考模型,研发了一个基于Web的轻量级工作流管理系统,阐述了其基于J2EE架构的体系结构的设计,用形式化方法详细描述了其工作流理论模型。提出了一个时间约束有向图模型,并根据提出的动态角色分配方法,给出了一个基于公钥基础设施技术的条件化基于角色的访问控制方法。最后,给出了工作流实例的引擎驱动算法。实际监测和用户反馈结果表明,采用该工作流管理系统作为框架的应用系统,能够显著缩短流程信息应用系统的开发周期,大大提高用户的办事效率。     

基于数据库管理的柔性工作流建模方法

提出一种数据库技术和工作流技术相结合的工作流模型，给出了该模型的构建方法，结合实例分析，构造了基于规则的执行模型，介绍了工作流程管理中的数据库操作、原理，并在实例中得以体现。实际应用表明，在提高企业敏捷性，支持结构化协同工作，实现企业业务流程的自动化方面，基于企业的工作流系统模型具有一定的应用价值。     

工作流管理系统动态变更模型与实例迁移方法研究

为提高工作流管理系统的柔性,研究了工作流动态变更模型和实例迁移方法.在基于统一建模语言和多色集合的工作流集成建模方法的基础上,建立了工作流动态变更模型,对节点(分支)的增加、删除和结构变化等常见动态变更进行了形式化描述.提出了工作流区域的概念,将当前运行节点和动态变更节点放在同一个层次上排序.基于基本模型结构的简化规则,提出了工作流区域的识别算法和排序规则.按照工作流实例迁移过程中可能采用的迁移策略,提出了支持动态变更的工作流实例迁移方法,并分析了实例迁移前后结构和语义的正确性.最后,以客户订单处理流程为例,验证了以上模型和方法的有效性.     

基于COM的产品设计工作流系统的研究与实现

针对产品设计过程的不确定性及目前工作流管理系统柔性不足的现状，提出在Web环境下，采用COM组件技术开发面向产品设计的工作流管理系统，为工作流定义与运行模块分别构建组件，实现了流程的可视化定制与自动流转。介绍了系统结构及工作流引擎的具体设计与实现，并给出了应用实例。     

基于SOA的协同制造工作流建模方法

针对现代制造业跨平台、跨区域、跨企业的协同需求,提出一种基于SOA的协同制造工作流建模方法。该方法利用面向服务的SOA体系结构框架实现企业的协同工作,同时采用业务流程建模符号BPMN和流程执行语言BPEL4WS构建基于SOA的协同制造业务流程模型。最后结合一个具体应用实例详细说明该工作流建模方法的使用。     

基于制造能力的工作流模型研究

工作流模型是工作流管理系统的核心和基础,许多方法可以应用于建模过程,但是这些方法缺少对制造过程,尤其是网络化制造过程的有力支持,不能满足制造领域工作流建模的要求。通过对现有面向制造工作流模型的改进,提出一种新的模型,包括四个子模型:基于多色集合理论构建过程模型,实现过程元素的分离,提高模型定义的动态性;基于Web服务的能力模型提供制造能力的服务;从用户角度出发,约束模型建立评价服务和流程的相对指标;通信模型以SOAP为基础保证模型的信息交互通畅。提出的基于制造能力的工作流模型适合于组织松散耦合、模型动态构建、信息分布定义的网络化制造环境。     

基于AOP的工作流系统与企业信息系统集成研究

针对工作流系统与企业现有信息系统集成问题，提出了基于面向方面编程技术的解决方案，分析了独立式和嵌入式两种工作流系统的集成模式，探讨了基于面向方面编程的集成方法。与传统的面向对象方法相比，该方法避免了代码分散和代码纠缠问题，在降低系统复杂性、提高组件重用性和流程优化方面具有明显优点。最后，结合飞机制造企业质量管理系统，给出了Shark工作流系统与J2EE框架的集成实例和实现过程。     

产品生命周期管理系统中工作流的访问控制模型

为了满足产品生命周期管理系统对流程的访问控制需求，在基于角色的访问控制模型的基础上，提出一种访问控制模型，实现了产品生命周期管理系统和工作流管理系统的共同授权。由产品生命周期管理系统管理企业中的文档和用户等信息，对其进行静态授权。在流程中，为实现动态授权，防止流程死锁和权限泄漏．引入基于流程实例的对象组，用于容纳在流程中的数据；同时，允许在流程、活动和对象组这3个层次上进行授权，不同层次的权限允许被继承和重定义。这样，不仅方便管理员进行授权，而且增加了授权灵活性，细化了授权粒度。     

基于工作流的发电设备行业工程计算管理

通过分析工程计算的模式、流程及其数据特点,以自主研发的工作流管理系统作为工程计算的流程引擎,基于Web Service实现了远程计算方法的调用,并在此基础上开发了面向发电设备行业工程计算管理系统。通过在发电设备行业中的应用,验证了该系统在工程计算管理方面的可行性和有效性。     

三绕组变压器的双绕组等效建模及在Matpower中的应用

针对实际电网存在着大量的三绕组变压器,但国际上一些著名商业软件,如BPA仿真软件、Matpower这一权威潮流计算开源软件,均只提供双绕组变压器模型,限制了其在具有三绕组变压器的电力系统中的应用的问题,潮流计算是自主开发的电力系统各种应用软件的核心模块,因此依托国际权威开源程序进行二次开发,是一种较好的选择。对Matpower要求的数据格式进行了归纳,对变压器的一般的等值电路及带理想变压器的等值电路和带标幺值的等值电路进行了分析研究,提出了三绕组变压器转换为双绕组等效模型的建模方法,使得原先只适应双绕组变压器的潮流计算软件可以适用于三绕组变压器电网的潮流计算;最后以Matpower软件为例进行了案例计算,并用PSASP仿真软件进行对比验证。研究结果证明,所提出的建模方法是有效的。     

On the Relation of Load to Average Gap in the Contact Between Surfaces with Longitudinal Roughness

A computer simulation model for the contact between longitudinally-oriented rough surfaces has been formulated. This model closely duplicates the actual surf ace contact deformation behavior by taking into account the elastic interactions between the asperities. There were no assumptions made about the shapes, or any deformation behavior of the asperities, except for their obeying the laws of elasticity. The plastic deformations on the high asperity peaks were taken into account by setting a ceiling on their contact pressures at the material hardness value. The simulations used real surface profiles which were digitized from unworn circumferentially ground steel surfaces. Each pair of these profiles was mathematically combined to form an equivalent rough profile pressing against an infinitely rigid flat and having the appropriately adjusted elastic modulus. A total of 28 different pairs of profiles were used in the simulations. Each contacting pair was subjected to 30 different load levels and the local contact pressures and deformations were calculated. The contact simulations yielded some important mathematical relationships between parameters, such as the real area of contact, average gap, and average asperity load through statistical curve fitting. Two analytical functions were generated to relate the average load to average gap and the real area of contact to load.     

电站锅炉模糊风险评价方法研究与应用

针对电站锅炉风险等级评价问题,将模糊综合评价技术应用到电站锅炉风险等级评价中。开展了电站锅炉失效影响因素及模糊评价因素的重要程度分析,建立了一套科学合理适于在线评价的电站锅炉风险评价体系,提出了模糊综合评价技术与改进的模糊层次分析法相结合的模糊风险评价方法,利用改进的模糊层次分析法计算了指标体系中各层指标权重。对某一台电站锅炉的实际运行工况影响子因素进行了模糊风险评价,采用模糊合成算子进行模糊综合运算得到电了站锅炉运行工况影响子因素的评价向量。研究结果表明:电站锅炉的运行工况影响子因素的风险评价等级为第6级,失效可能性等级为小,该电站锅炉运行工况良好。     

交通荷载作用下桥梁结构参数识别方法

应用动力节点加载法,将作用在桥梁上的交通荷载转化为等效节点荷载,再用两步构造法识别结构物理参数.第1步,用Newmark-β方法变换结构运动方程,并用结构的加速度响应求得变换空间内的位移、速度和加速度响应;第2步,基于最小二乘原理,构造出变换空间内求解结构参数的递推式,进行结构物理参数识别.数值模拟结果表明,在交通荷载作用下,该方法能够快速、准确地进行桥梁结构参数识别.     

RLS and LMS blind adaptive multi-user detection method and comparison in acoustic communication

RLS and LMS blind adaptive multi-user detection algorithm and multi-user detector was proposed to solve the problem of multi-user signal detection problem encountered in underwater acoustic communication networks.In simulation analysis,RLS and the LMS blind adaptive multi-user detector were designed and tested for synchronous and asynchronous multi-user communication process.The results of SIR comparison and MMSE comparison show that,both of the two methods can realize blind adaptive detection when any user change in multi-user communication,during this process,the training communication sequences are not needed.The RLS algorithm has about 5 dB higher in SIR compared with LMS algorithm,and the convergence velocity of RLS algorithm is also higher than LMS algorithm when the communication users change.RLS algorithm has better ability in multi-user detection than that of LMS algorithm,and it has great attraction and guiding significance for solving the problem of multiple access interference(MAI) in multi-user communication.     

Robust Impedance Control of Robots Using an Adaptive Interaction Force Observer

For robot interaction control,the interaction force between the robot and the manipulated object or environment should be monitored.Impedance control is a type ...     

Research on key techniques of expendable conductivity temperature depth measuring system

This paper analysis the developing of expendable conductivity temperature depth measuring system(XCTD)and introduce its principle of measuring about temperature,salinity and depth of ocean.Some key techniques are put forward.According to the real needs of XCTD,conductivity sensor with high sensitivity is designed by principle of electromagnetic induce,the ocean conductivity from induced electromotive force has been calculated.Adding temperature correction circuit would help to reduce error of conductivity measurement because of sharply changing temperature.Advanced temperature measuring circuit of high precision and the constant current source is used to weaken effect of self-heating of resistance and fluctuation of the source.On respect of remote data transmission,LVDS is a good choice for the purpose of guarantee the quality of data transmitted and the transmission distance is reaching to thousand meters in the seawater.Modular programming method is also brought into this research aimed at improve the stability,reliability and maintainability of the whole measuring system.In February,2015,the trials in South China Sea demonstrate that the developed XCTD realize effective measurement at a speed of 6 knots and detection depth at 800 m.The consistency coefficient of the acquired data is greater than 0.99 and the success rate of probe launching is above 90%.     

CHARACTERISTCS OF FLUID FILM IN OPTIMIZED SPIRAL GROOVE MECHANICAL SEAL

In order to investigate the sealing performance variation resulted from the thermal deformation of the end faces, the equations to calculate the fluid film pressure distribution, the bearing force and the leakage rate are derived, for the fluid film both in parallel gap and in wedgy gap. The geometrical parameters of the sealing members are optimized by means of heat transfer analysis and complex method. The analysis results indicate that the shallow spiral grooves can generate hydrodynamic pressure while the rotating ring rotates and the bearing force of the fluid film in spiral groove end faces is much larger than that in the flat end faces. The deformation increases the bearing force of the fluid film in flat end faces, but it decreases the hydrodynamic pressure of the fluid film in spiral groove end faces. The gap dimensions which determine the characteristics of the fluid film is obtained by coupling analysis of the frictional heat and the thermal deformation in consideration of the equilibrium condition of the bearing force and the closing force. For different gap dimensions, the relationship between the closing force and the leakage rate is also investigated, based on which the leakage rate can be controlled by adjusting the closing force.     

Quantum Cooperative Robotics and Autonomy

The intersection of Quantum Technologies and Robotics Autonomy is explored in the present paper.The two areas are brought together in establishing an interdisci...     

OPTIMIZATION METHOD ON IMPELLER MERIDIONAL CONTOUR AND 3D BLADE

An optimization method for 3D blade and meridional contour of centrifugal or mixed-flow impeller based on the 3D viscous computational fluid dynamics (CFD) analysis is proposed. The blade is indirectly parameterized using the angular momentum and calculated by inverse design method. The design variables are separated into two categories: the meridional contour design variables and the blade design variables. Firstly, only the blade is optimized using genetic algorithm with the meridional contour remained constant. The artificial neural network (ANN) techniques with the training sample data schemed according to design of experiment theory are adopted to construct the response relation between the blade design variables and the impeller performance. Then, based on the ANN approximated relation between the meridional contour design variables and impeller performance, the meridional contour is optimized. Fewer design variables and less calculation effort is required in this method that may be widely used in the optimization of three-dimension impellers. An optimized impeller in a mixed-flow pump, where the head and the efficiency are enhanced by 12.9% and 4.5% respectively, confirms the validity of this newly proposed method.