工作流异常处理技术的研究

在工作流系统中,异常事件出现是不可避免的,如何处理工作流异常非常重要,本文先介绍了工作流异常的的基本概念,然后阐述了工作流异常的处理方法,提出了工作流异常处理机制设计和工作流异常处理规则的数据结构。     

工作流系统中异常处理的研究

工作流技术在实现业务流程自动化和企业应用集成等方面有着广泛的应用。但由于工作流的流程运行时间跨度一般较大，在流程运行期间可能会出现多种异常情况。文章对工作流异常处理进行了初步探讨，首先介绍了工作流异常概念、起因、分类以及常见的异常处理策略。然后详细介绍了常见的工作流异常处理的各种方法以及各种方法之间的优劣。最后展望了工作流异常处理的未来发展方向。     

基于案例推理的工作流异常处理研究

对工作流的异常和案例推理(Case-Based Reasoning,简称CBR)的机制进行了介绍,给出了一个应用CBR技术进行异常处理的工作流模型,并研究了应用CBR方法处理工作流异常的机制。     

基于案例推理的工作流异常处理研究

对工作流的异常和案例推理(Case-Based Reasoning,简称CBR)的机制进行了介绍,给出了一个应用CBR技术进行异常处理的工作流模型,并研究了应用CBR方法处理工作流异常的关键技术。     

工作流管理系统异常处理的方法与层次

工作流技术在信息处理领域的应用越来越受到重视,但应用中环境和用户要求的不断发展和变化需要工作流管理系统具有灵活的处理能力,工作流系统的异常处理正是要解决这种不断要求的变化。文章介绍了工作流异常处理的应用范围,总结了不同的应用方法,从系统的角度提出了工作流未来的异常处理层次,并在研究可适应性工作流技术方面进行了探讨。     

基于案例推理的工作流异常处理研究

对工作流的异常和案例推理（Case—Based Reasoning，简称CBR）的机制进行了介绍，给出了一个应用CBR技术进行异常处理的工作流模型．并研究了应用CBR方法处理工作流异常的机制。     

信牌驱动工作流异常处理研究与实现

随着工作流技术的不断发展和工作流技术在各个业务领域的不断扩展,人们对工作流的适应性要求越来越高,因此,工作流异常处理研究变的越来越重要.为了使现有工作流具有可适应性,本文在研究工作流异常处理分类、异常处理实现方法、异常处理具体策略的基础上提出信牌驱动式工作流的异常处理策略,对一般性工作流异常处理和同步区内的异常处理进行了详细的论述,并重点给出了信牌驱动式工作流同步区的异常处理策略.信牌驱动工作流异常处理机制提高了信牌驱动工作流的适应性.     

基于Agent工作流系统中的异常处理

Agent技术是人工智能领域的新兴课题,把Agent技术应用到工作流系统中,通过Agent的智能性、分布性和主动性可以使工作流系统更灵活、更稳定。论文对工作流中的异常进行了介绍,提出了基于Agent工作流中的异常处理方法,并给出了一个具体应用。     

异常处理机制研究

介绍了异常处理机制,包括异常的抛出、捕获、传播,并描述了异常的处理模式、传播机制、处理环境。不同应用领域的异常处理机制不同,以Java语言和工作流管理系统为例,分别介绍和讨论了程序设计语言层面和企业层面上的异常处理机制。     

基于CPN的工作流异常处理模型设计

工作流异常处理是工作流管理系统中的重要组成部分,但是它的实现既复杂又耗时。为了支持面向服务的工作流,层次化地描述异常处理,提出一种基于CPN的异常处理模型。在形式化描述工作流异常的基础上,采用补偿法作为异常处理方式,详细描述了处理结构中的异常监控、异常分析和补偿案例执行三个子过程。结合茶餐厅的运营模型的仿真实验证明了该模型可有效地分离工作流的异常处理逻辑和运行逻辑,并支持工作流管理系统的实施。     

Web interface-driven cooperative exception handling in ADOME workflow management system

Exception handling in workflow management systems (WFMSs) is a very important problem since it is not possible to specify all possible outcomes and alternatives. Effective reuse of existing exception handlers can greatly help in dealing with workflow exceptions. On the other hand, cooperative support for user-driven computer supported resolution of unexpected exceptions and workflow evolution at run-time is vital for an adaptive WFMS. We have been developing ADOME-WFMS as a comprehensive framework in which the problem of workflow exception handling can be adequately addressed. In this article, we present an adaptive exception manager and its web-based interface for ADOME-WFMS with procedures for supporting the following: reuse of exception handlers, thorough and automated resolution of expected exceptions, effective management of Problem Solving Agents, cooperative exception handling, user-driven computer supported resolution of unexpected exceptions, and workflow evolution.     

工作流异常处理的UML活动图描述方法

提出了用UML活动图描述工作流异常处理的方法.根据工作流系统特点,对UML活动图作适当扩展,为扩展后的活动图定义了的形式化语句,通过实现一个RCT步来描述一个潜在发生的异常状况,并对不同处理策略下的处理过程进行了描述.结果使得UML活动图适合描述含有异常的工作流系统;由于是采用了UML建模语言,编码实现更容易.     

Extended event–condition–action rules and fuzzy Petri nets based exception handling for workflow management

Exception handling plays a key role in dynamic workflow management that enables streamlined business processes. Handling application-specific exceptions is a knowledge-intensive process involving different decision-making strategies and a variety of knowledge, especially much fuzzy knowledge. Current efforts in workflow exception management are not adequate to support the knowledge-based exception handling. This paper proposes a hybrid exception handling approach based on two extended knowledge models, i.e., generalized fuzzy event–condition–action (GFECA) rule and typed fuzzy Petri net extended by process knowledge (TFPN-PK). The approach realizes integrated representation and reasoning of fuzzy and non-fuzzy knowledge as well as specific application domain knowledge and workflow process knowledge. In addition, it supports two handling strategies, i.e., direct decision and analysis-based decision, during exception management. The approach fills in the gaps in existing related researches, i.e., only providing the capability of direct exception handling and neglecting fuzzy knowledge. Based on TFPN-PK, a weighted fuzzy reasoning algorithm is designed to address the reasoning problem of uncertain goal propositions and known goal concepts by combining forward reasoning with backward reasoning and therefore to facilitate cause analysis and handling of workflow exceptions. A prototype system is developed to implement the proposed approach.     

一种实用的工作流异常处理机制

提出了一种基于虚拟组织集成框架IFVO的工作流管理系统的异常处理机制,深入分析了工作流系统异常处理的相关问题,并结合实例阐述了该机制的实现和应用。     

Exception Handling for Conflict Resolution in Cross-Organizational Workflows

Workflow management systems (WfMSs) are being increasingly deployed to deliver e-business transactions across organizational boundaries. To ensure a high service quality in such transactions, exception-handling schemes for conflict resolution are needed. The conflicts primarily arise due to failure of a task in workflow execution because of underlying application, or controlling WfMS component failures or insufficient user input. So far, little progress has been reported in addressing conflict resolution in cross-organizational business processes, though its importance has been recognized. In this paper, we identify the exception handling techniques that support conflict resolution in cross-organizational settings. In particular, we propose a novel, bundled exception-handling approach, which supports (1) exception knowledge sharing--sharing exception specifications and handling experiences, (2) coordinated exception handling, and (3) intelligent problem solving--using case based reasoning to reuse exception handing experiences. A prototype of this exception handling mechanism is developed and integrated as a part of the METEOR Workflow Management System. An evaluation of our approach is also presented through some sample workflow applications.     

Adaptive exception handling for scientific workflows

Scientific workflow systems often operate in highly unreliable, heterogeneous and dynamic environments, and have accordingly incorporated different fault tolerance techniques. We propose an exception‐handling mechanism, based on techniques adopted in programming languages, for modifying at run‐time the structure of a workflow. In contrast to other proposals that achieve the required flexibility by means of the infrastructure, our proposal expresses the exception‐handling mechanism within the workflow language—primarily as two exception‐handling patterns that are exclusively based on the Reference Nets‐within‐Nets formalism (a specific type of Petri nets). When an exception is detected, a workflow in our approach can be re‐written (replaced), based on the particular failure condition that has been detected. This enables workflow users to have better control and understanding of the behaviour of their workflow without having to be aware of the underlying infrastructure. Copyright © 2009 John Wiley & Sons, Ltd.     

Exception Handling in Workflow Systems

In this paper, defeasible workflow is proposed as a framework to support exception handling for workflow management. By using the justified ECA rules to capture more contexts in workflow modeling, defeasible workflow uses context dependent reasoning to enhance the exception handling capability of workflow management systems. In particular, this limits possible alternative exception handler candidates in dealing with exceptional situations. Furthermore, a case-based reasoning (CBR) mechanism with integrated human involvement is used to improve the exception handling capabilities. This involves collecting cases to capture experiences in handling exceptions, retrieving similar prior exception handling cases, and reusing the exception handling experiences captured in those cases in new situations.     

基于优先级的柔性时空工作流异常处理

针对当前工作流异常处理独立于工作流流程的情况,提出一种基于优先级过滤的工作流异常处理方法,通过定义异常处理优先级,结合工作流的整体流程,过滤次要异常,优先处理重要异常,实现工作流异常有效处理。并通过一个技术文档的实例,验证该方法确能够提高工作流异常处理的有效性,降低异常处理对整体流程的影响。