一种基于Agent的语义Web服务编制框架

针对动态、开放网络环境下复杂多变的业务需求,本文在前期语义编程语言SPL研究的基础上,提出一种基于Agent和本体的语义Web服务编制方法,形成一个以语义编程语言SPL为核心的、可适用于将语义Web服务与多A-gent技术无缝集成起来的,进行语义Web服务编制的技术框架。框架实现基于SPL开发和运行支撑平台,该平台为语义Web服务和软件Agent提供必要的运行支持。     

基于Agent的分布仿真平台原型系统设计与实现

基于Agent的分布仿真是基于Agent的建模与仿真ABMS(Agent-Based Modeling and Simulation)研究的重要组成部分。在提出的基于Agent的分布仿真软件框架和通信系统设计与实现的基础上,利用Java语言和面向对象的方法设计实现了一个基于Agent的分布仿真平台原型系统ADSimE。介绍了该分布式仿真平台的主要实现细节,给出了全系统的主要Agent类的UML设计,重点阐述了保守策略仿真Agent类和乐观策略仿真Agent类的设计、处理流程以及KQML消息解析的实现细节。最后以闭合排队网络为例,说明了怎样在该环境下进行基于Agent的分布仿真应用的开发。     

基于多Agent和网格技术的煤炭企业项目组合信息管理平台研究

为了解决煤炭企业项目组合各参与方信息平台的异构问题,提出了一种基于多Agent和网格技术的煤炭企业项目组合信息管理平台,给出了该平台的框架、各Agent实体的功能设计及平台运行流程。该平台采用网格技术实现了各异构平台的集成,使得项目组合各参与方可协作工作,并采用多Agent系统将网格环境融合到各异构平台中,实现了各参与方信息平台的统一配置和管理。该平台在某煤炭企业的应用验证了其有效性。     

基于移动Agent的地理信息公共服务平台研究与设计

阐述了基于移动Agent的空间信息服务以及移动Agent与空间信息服务结合的优势,在此基础上,对基于移动Agent的地理信息公共服务平台框架和空间信息服务集成流程的实现方式进行了研究与设计。该套框架和流程能够使各级地理信息公共服务平台在不同层面上实现共享与互操作,并为空间信息服务和其他应用/服务之间提供有效的集成机制。     

基于可变性模型的可复用与可定制SaaS软件开发方法

云计算环境下,软件通过互联网向租户提供服务,这种基于互联网的软件交付模式称为SaaS（软件即服务）.与传统软件交付模式相比,SaaS软件通常运行于软件供应商的服务器端,同时为多个租户提供服务.由于需要支持不同租户的个性化需求,SaaS软件应具备足够的灵活性,以应对快速变化的租户需求;而且针对某一个租户的变更,不应影响其他租户.通过扩展课题组前期开发的基于可变性管理的适应性服务组装方法及其支持平台,提出了一种云计算环境下可复用、可定制的SaaS软件开发方法,开发了相应的支持平台,包括支持SaaS模式的服务组装引擎和远程定制工具.该方法针对不同租户的共性需求,提供一个抽象服务组装模型,支持平台在运行阶段解释执行抽象服务组装模型,根据租户的个性化需求派生不同的流程实例,这些运行时流程实例多态共存、互不影响.采用一个特定领域的SaaS软件实例来验证该方法的可行性,评估了支持平台的性能.实验结果表明,该方法及其支持平台可以支持多实例多租户的交付模式.     

支持动态建模的工作流管理系统的研究与设计

传统的工作流模型大多是处理可预见的、可事先给出完整定义的流程，然而现代企业流程所固有的多变性和灵活性要求其完整定义只有在流程实例运行过程中逐步得到完善，因而传统工作流模型很难处理现代企业流程．提出一种基于ECA规则和活动组合的动态工作流模型，为现代企业动态流程建模提供了一种简单可行的方法。设计了一个多Agent工作流管理系统，有效地实现了对该动态工作流模型的支持。     

基于Agent的网构软件需求监控框架

网构软件所面临的复杂、开放和动态变化的运行环境使其运行时行为常常会偏离需求规约.已有一些研究工作提出基于目标模型和需求推理实现软件需求的运行时监控和自修复,但还缺少实现框架,特别是缺少符合网构软件分布式和社会化特性的需求监控实现方法.针对这一问题,提出一种基于Agent的网构软件需求监控框架.框架中的需求监控Agent通过非侵入的方式实现对作为其宿主系统的网构软件实体的监控和干预,并通过Agent间的通信和协作实现社会化的目标委托和协作监控.为了验证框架的有效性,通过一个案例分析,对框架和工具实现进行了有效性评估.     

基于多Agent的特征提取模型研究*

讨论了基于多Agent的特征提取模型的工作流程,主要研究了该多Agent模型的构建框架和模型中单个Agent的通用结构,借助JAFMAS这一面向MAS的基于Java的Agent框架实现了系统的建立,并最后给出了所举例子的实际运行结果。     

基于多Agent系统的数字家庭模型研究

基于Agent的仿真是研究分布式复杂系统的重要内容,数字家庭是分布式应用的一个方面,IBMAglet是一个实现基于Agent仿真模型的软件工具。文中详细阐述了使用IBMAglet仿真平台实现数字家庭仿真模型的一般方法,探索了在IBMAglet仿真模型中的Agent和Agent交互的方法与过程。为该领域的研究者在模型实现这一问题上提供了一定的参考。     

面向移动机器人应用的跨平台自适应软件框架

摘要：自适应软件在移动机器人上具有广泛的应用前景,然而要在具有不同软硬件平台的移动机器人上开发自适应软件是一件非常困难的事情．．为了解决这个问题,提出并实现了一个面向移动机器人应用的跨平台自适应软件框架该框架屏蔽了运行平台的软硬件差异性,并使用规则文件将自适应逻辑分离出来,从而降低了自适应软件开发的难度。为了便于编写及检查规则文件,还实现了一个可视化的规则文件编辑器,用于自动生成模型图,并检查规则中存在的语法及逻辑错误i,最后,通过实验测试了框架的使用情况,并对框架的应用效果进行了评估、     

Integrating constraints to support legally flexible business processes

Flexible collaboration is a notable attribute of Web 2.0, which is often in the form of multiple users participating different activities that together complete a whole business process. In such an environment, business processes may be dynamically customized or adjusted, as well as the participants may be selected or attend uncertainly. So how to ensure the legitimacy of a business process for both security and business is increasingly critical. In this paper, we investigate this problem and introduce a novel method to support legally flexible business processes. The proposed Constraint-based Business Process Management Model incorporates constraints into the standard activities composing a business process, where the security constraints place restrictions on participants performing the activities and business constraints restrict the dependencies between multiple activities. By the assembly operations, business processes can be dynamically generated and adjusted with activities, that are obliged to the specified constraints. Several algorithms are presented to verify the consistency of constraints and the soundness of the generated business processes, as well as to perform the execution planning to guarantee the correct execution of a business process on the precondition of satisfying all constraints. We present an illustrative example and implement a prototype for the proposed model that is an application of property rights exchange for supporting legal business processes.     

Contributions of Dichotomic View of plasticity to seamlessly embed accessibility and adaptivity support in user interfaces

Recent legal changes have increased the need for developing accessible user interfaces in computer-based systems. In this sense, previously existing user interfaces are intended to be modified and new user interfaces are intended to be designed taking accessibility guidelines into account. Typically, model-based approaches have been used when developing accessible user interfaces or redefining existing ones. But the use of static models leads to the development of not dynamically adaptable user interfaces. Dynamic adaptation in accessible user interfaces is important due to the fact that interaction difficulties on people with disabilities may change through use. In this paper, we present some contributions that can be obtained from the application of the Dichotomic View of plasticity in the personalization of user interfaces. With the double perspective defined in this approach, it is intended to go further from a mere adaptation to certain user stereotypes, offering also a dynamic support to real limitations or difficulties users can encounter during the use of the UI. This goal is achieved analyzing user logs by an inference engine that dynamically infers modifications in the user interface to adjust it to varying user needs. A case study is presented in order to show how the guidelines and software support defined in the Dichotomic View of plasticity can be applied to develop a component for a particular system aimed at performing dynamic user interface adaptations with accessibility purposes. This approach includes some innovations that make it different from conventional adaptable mechanisms applied to accessibility in some important aspects.     

A synergy between context-aware policies and AOP to achieve highly adaptable Web services

Modern service-based systems are frequently required to be highly adaptable in order to cope with rapid changes and evolution of business goals, requirements, as well as physical context in a dynamic business environment. Unfortunately, adaptive systems are still difficult to build due to their high complexity. In this paper, we propose a new approach for developing highly adaptable Web services based on a synergy between context-aware Web service policies and Aspect-Oriented Programming. This synergy is achieved through the elaboration of an innovative extension of the Web Service Policy Language (WSPL), which allows for context specification at both policy and rule levels. In addition, we provide a tool for the development of aspect-oriented policies, including an option to translate WSPL policies into aspect-oriented policies. These policies can be automatically woven into composite Web services (e.g., a BPEL process). The elaborated synergy between context, policies, and aspects allows service providers to increase the level of adaptability of Web services at different layers of applications.     

基于代理和BPEL4WS的Web服务合成与实现

Web服务的交互和实现被推荐通过软件代理来实现.Web服务目前还不能很好地支持动态、自适应的服务组合和分布式业务流程.软件代理在建模、知识表达和交互等技术上的优势,能够强化Web服务的交互和动态应用能力.基于代理和面向流程建模的BPEL4WS,可以实现Web服务面向业务应用的合成与执行,支持多个协同的业务流程及其动态配置.系统分析了代理、BPEL4WS和Web服务整合的技术与实现方案,利用JADE平台开发了相关的测试模型,并且以网上拍卖为案例,验证了所提方案及实现.     

A layered architecture for flexible Web service invocation

Web service composition is emerging as an interesting approach to integrate business applications and create intra‐organizational business processes. Single Web services are combined to create a complex Web service that will realize the process business logic. Once the process is created, it is executed by an orchestration engine that invokes individual Web services in the correct order. However, Web services composing the workflow sometimes become unavailable during the run‐time phase, blocking process execution. This paper describes an architecture that allows the flexible orchestration of business processes. With this approach, Web services composing the process can be automatically substituted with other compatible Web services during process execution. A methodology is defined to evaluate Web service compatibility based on interface matching, in order to select substitutable Web services. Copyright © 2005 John Wiley & Sons, Ltd.     

Research on dynamic business composition based on web service proxies

Web services-based business composition brings a number of advantages to the enterprise application development. How to select and compose the web services based on their functionality and QoS (Quality of Service) dynamically prove to be more and more important. In this paper we develop a proxy-based framework to compose Web services dynamically. The framework is featured with a QoS model, an effective service discovery and selection algorithms to facilitate the dynamic integration of Web services and management of abnormalities. Furthermore, a business process constructing method based on service slice is put forward to satisfy the users’ personalized requirements more effectively and flexibly. Our study concerns both functionality and QoS characteristics of Web services to identify the optimal business process solutions. A Complete case study is also included in this paper and the performance demonstrated that the framework and algorithms can provide a tangible and reliable solution to dynamic Web service composition and adaptation.     

Improving device-aware Web services and their mobile clients through an aspect-oriented,model-driven approach

ContextMobile devices have become an essential element in our daily lives, even for connecting to the Internet. Consequently, Web services have become extremely important when offering services through the Internet. However, current Web services are very inflexible as regards their invocation from different types of device, especially if we consider the need for them to be adaptable when being invoked from mobile devices.ObjectiveIn this paper, we provide an approach for the creation of flexible Web services which can be invoked transparently from different device types and which return subsequent responses, as well as providing the client’s adaptation as a result of the particular device characteristics and end-user preferences in a completely decoupled way.MethodAspect-Oriented Programming and model-driven development have been used to reduce both the impact of service and client code adaptation for multiple devices as well as to facilitate the developer’s task.ResultsA model-driven methodology can be followed from system models to code, providing the Web service developer with the option of marking which services should be adapted to mobile devices in the UML models, and obtaining the decoupled adaptation code automatically from the models.ConclusionWe can conclude that the approach presented in this paper provides us with the possibility of following the development of mobile-aware Web services in an integrated platform, benefiting from the use of aspect-oriented techniques not only for maintaining device-related code completely decoupled from the main functionality one, but also allowing a modularized non-intrusive adaptation of mobile clients to the specific device characteristics as well as to final user preferences.     

采用构件组装技术协同开发Web应用的方法

在云计算环境下,引入网络化的协同开发机制,能优化Web应用的开发过程,缩短开发周期,提高Web应用的开发效率。提出了一种采用构件组装技术协同开发Web应用的方法。在该方法中,Web应用的功能或流程活动将以构件为单位进行划分。划分出的构件可以进一步地拆分成多个子构件,并分别以开发任务的形式发出。开发者可以接受任务,并在构件开发模板和自动生成的代码框架下进行开发。开发出的构件会被统一回收,并组装成对应于原功能或者原业务流程活动的构件。为了验证方法的可行性和有效性,实现了一个基于协同开发Web应用的构件组装工具,以及用于自动生成代码框架的离线开发工具。     

Automatic derivation of BPEL4WS from IDEF0 process models

Integration definition for function modelling (IDEF0) is one of the most popular notations for modelling business processes. It employs a rather simple and intuitive modelling construct, consisting of boxes representing functions and arrows connecting them signifying flow of information and materials. Web services on the other hand are an emerging technology for implementing distributed systems. Web service orchestration languages, such as Business Process Execution Language for Web Services (BPEL4WS), are the emerging approach for describing processes as networks of coordinated web services. Business processes as captured in IDEF0 models, however, may contain both web services as well as other types of activities which need to be coordinated. By automatically analysing the Extensible Markup Language (XML) definition of an IDEF0 model, we can identify how web services interact with other activities and at runtime generate code to support the orchestration of web services with the overall business process. The approach proposed is independent of the orchestration language and ensures an implementation independent model for specifying web service orchestrations. This approach also enables the top-down analysis of a business process to its constituent web services and avoids any misalignment problems during design time between the two.