Building Grid Portal Applications From a Web Service Component Architecture

This work describes an approach to building Grid applications based on the premise that users who wish to access and run these applications prefer to do so without becoming experts on Grid technology. We describe an application architecture based on wrapping user applications and application workflows as Web services and Web service resources. These services are visible to the users and to resource providers through a family of Grid portal components that can be used to configure, launch, and monitor complex applications in the scientific language of the end user. The applications in this model are instantiated by an application factory service. The layered design of the architecture makes it possible for an expert to configure an application factory service with a custom user interface client that may be dynamically loaded into the portal.     

Converged multimedia services in emerging Web 2.0 session mobility scenarios

The increasing request for converged multimedia services have motivated relevant standardization efforts, such as the Session Initiation Protocol (SIP) to support session control, mobility, and interoperability in all-IP next generation wireless networks. Notwithstanding the central role of SIP in novel converged multimedia, the potential of SIP-based service composition for the development of new classes of Web 2.0 services able to interoperate with existing HTTP-based services is still widely unexplored. The paper proposes an original solution to improve online user experience by integrating a SIP stack into the Web browser, thus enabling the execution of novel SIP-based applications directly at the client endpoint. In particular, our browser extension coordinates with our novel SIP-based Converged Application Server to enable session mobility and prevent abuses of the services available in the client. Experimental results show that our SIP-based solution is feasible in most common Internet deployment scenarios and enables session mobility with limited management cost.     

Web service selection algorithm based on principal component analysis

Existing Web service selection approaches usually assume that preferences of users have been provided in a quantitative form by users. However, due to the subjectivity and vagueness of preferences, it may be impractical for users to specify quantitative and exact preferences. Moreover, due to that Quality of Service (QoS) attributes are often interrelated, existing Web service selection approaches which employ weighted summation of QoS attribute values to compute the overall QoS of Web services may produce inaccurate results, since they do not take correlations among QoS attributes into account. To resolve these problems, a Web service selection framework considering user’s preference priority is proposed, which incorporates a searching mechanism with QoS range setting to identify services satisfying the user’s QoS constraints. With the identified service candidates, based on the idea of Principal Component Analysis (PCA), an algorithm of Web service selection named PCA-WSS (Web Service Selection based on PCA) is proposed, which can eliminate the correlations among QoS attributes and compute the overall QoS of Web services accurately. After computing the overall QoS for each service, the algorithm ranks the Web service candidates based on their overall QoS and recommends services with top QoS values to users. Finally, the effectiveness and feasibility of our approach are validated by experiments, i.e. the selected Web service by our approach is given high average evaluation than other ones by users and the time cost of PCA-WSS algorithm is not affected acutely by the number of service candidates.     

基于动态领域模型的业务流程管理

在云计算环境下,业务流程会随着企业的业务流程发生变化。必须设计出可以在运行环境下动态修改的业务流程才能满足要求。金蝶公司设计了一个业务流程框架,可以实现业务流程的动态设计和解析。针对云计算环境下,业务流程中的动作很多,不易管理的情况,设计了一个三层业务流程模型。针对业务流程在不同组织间转移产生的权限问题,设计了单据的业务流程视图模式,赋予用户临时的单据访问权限。通过以上方法,很好的解决了云计算环境下业务流程设计中遇到的问题。     

网络出口转换技术研究

随着网络利用的普及,企事业单位都多数建有自己的网络,为满足不同的需求,接入了多个网络出口。如何解决网络服务与网络接入的关系,提高网络服务系统接口带宽和访问速度,是多网接入用户需要解决的问题,文中结合作者的工作经验,以Web网站作为服务对象,对上述问题进行分析和研究,其成果对多网用户有较好的借鉴。     

Cooperative scheduling and its application to steelmaking processes

A cooperative approach to scheduling problems is proposed, and its application to creating daily schedules for steelmaking processes is described. In cooperative scheduling, procedures, rules, and the user cooperate to make a feasible schedule efficiently. The procedures, collectively called a scheduling engine, work as a local constraint satisfier to solve general primitive constraints. Rules that represent domain-dependent knowledge then solve the domain-specific constraints by means of a pattern-matching function. The user evaluates the schedule and modifies it by means of a user-friendly interface with direct-manipulation functions. The user interaction is therefore included in the system architecture as a global constraint satisfier. The iteration of this cycle improves the schedule until it becomes feasible. Experimental results obtained with Scheplan, the scheduling environment that applies this approach to scheduling steelmaking processes, show that the daily scheduling time is much less than in manual scheduling and the quality of the schedule is much improved     

Web服务安全性分析及研究

目前Web服务体系架构存在标准限制且需要支持多种类型的客户端的问题,因而使得Web服务的安全极具挑战。文章通过对Web服务的基本组件和协议的分析,说明了如何利用现有的技术来应对Web服务安全所面临的风险,并对一些基本的保护机制作了说明。在此基础上,提出了一种基于标准的、新的安全体系架构,满足企业的Web服务安全需要。     

基于社会网络的语义Web服务发现模型

web服务发现模型是为了满足用户各种用途的web服务方式,以代码重入和松散耦合的方式以最优的组合实现可以提供用户需要的web服务模型。web服务发现模型是一种面向服务系统架构的一类基础性问题,但是又是解决用户不同需求十分有效的模型。通过对本体特性和发现模型的结构特点的研究,在本文中引入了本体解析的web服务标注算法和环境语义web发现模型。从而更好地实现web服务发现模型的选择用户所要求的服务的准确性,也为web服务的智能匹配做出了探索。     

基于时序约束分解的QoS感知的Web服务组合

基于时序约束的QoS感知的Web服务组合(TC-QSC)问题是在考虑时序约束的基础上寻找满足QoS约束或效用最大化的Web服务组合问题,受到了越来越多的关注.本文提出了一种时序约束分解方法,把施加于整个或部分工作流的时序约束分解为施加于每个活动的局部时序约束,从而将TC-QSC问题转换为一般的QoS感知的Web服务组合(QSC)问题,并通过过滤不满足局部时序约束的候选服务,一定程度上减小原问题的规模.这种时序约束分解过程主要依赖于工作流及其涉及的活动,而与各活动的候选服务关联不大,复杂度较低.实验测试了该方法的效果与时间开销,验证了其对于局部优选算法的必要性.     

基于P2P的语义Web服务发现模型研究

为解决现有的Web服务缺少形式语义支撑,文中提出了一种基于P2P的语义Web服务发现模型,在P2P发现方面加入了本体信息,引入一种新的本体编码方式,使得Web服务在P2P层内支持语义发现,提高了Web服务发现的准确性和即时性.     

ISDN user-network interface management protocol

The author discusses an ISDN user-network interface management protocol. The protocol enables users to manage network services, operation (such as network reconfiguration and routing change), and maintenance. That the user equipment should be looked at from both user-of-service and manager-of-service perspectives is emphasized in a discussion of the relation of the user equipment to the Telecommunication Management Network (TMN). The current status of the ISDN UNI management protocol architecture studies in CCITT is reviewed, and problems specific to the ISDN environment are identified. The need to strengthen the convergence function to solve ISDN-specific problems is stressed. Examples of ISDN UNI management protocol applications are given     

面向异构网管理的多级中间件体系

为了减少异构网网络管理方面所付出的代价，继续利用各专业子网已有的网络基础设施并对其进行跨域管理，提出了一种多级网络管理体系。该体系模型以面向对象、中问件技术为核心．利用CORBA的IDL接口封装网元层元素，将本地各专业子网抽象为分布式对象，使用CORBA平台完成对象问的互连。中问层使用CORBA/Web Services复合代理，上层则由Web Services直接联入Intemet。授权用户可在Intemet任意一点应用GUI终端（浏览器）访问网络系统，对异构网下层网元元素进行网络管理。     

基于Spring及JSF框架的订单信息管理系统

针对汽车零部件制造企业生产销售过程中销售订单多、生产协作单位多、资金流动量大、接口管理复杂等情况,提出了一种基于Spring[1]及JSF框架的以订单为主线的订单信息管理系统的解决方案,建立一个包括表示层、业务逻辑层和数据存储层的多层应用体系,采用工作流与消息机制,Spring及JSF框架的结合减轻了软件开发的工作量和复杂性,提高了软件的可重构性和可用性,并作为一个数据集中的集成应用系统,实现了多个订单、多个生产协作单位和大量资金、材料、进度等信息的实时集中与共享,从而提高企业的整体管理水平.     

交通2.0——智慧交通的关键

基于"Web 2.0"、"City 2.0"、"政府2.0"等概念,提出了"交通2.0"概念,并建立了系统模型。该系统模型包括众筹数据和开放数据两个维度,众筹数据通过收集公众从智能手机、车载终端、Web 2.0网站上传的交通数据,获取现有检测系统不能提供的实时数据,并及时解决公众使用交通系统过程中发现的问题;开放数据通过开放公共数据,催化公众把开放的数据做出各种相互补充相互竞争的应用和服务,形成可持续的全面解决方案和创新的生态环境。该系统模型通过云计算、大数据处理、手机应用等技术做到了聚合众筹数据,提供开放数据以催化产生创新的交通应用和服务以完善现有交通设施和管理制度,并给将来的交通规划提供数据支撑和科学决策支持。智慧交通项目集成"交通2.0"后,实践表明奠定众筹数据和开放数据两个渠道,使公众能够积极地参与到交通生态链的完善和智慧化过程中来,是真正实现从"智能"到"智慧"的关键,是智慧交通系统产生活力的源泉。     

分布式组件与Web服务集成技术研究

分布式组件技术将事务逻辑和系统服务相分离，简化了系统开发的复杂性，已经成为企业应用开发的主流技术．但缺乏Web接口和通信协议难于穿越防火墙的局限性制约了其在Internet环境下的应用。Web服务是近年来提出的一种新的面向服务的体系结构，主要用来开发基于Internet的服务。针对分布式组件技术在Internet环境下数据共享和应用集成的局限性。提出了分布式组件技术和Web服务集成的方案，并以CORBA为例说明了集成中的关键技术。     

The EMA system: a CTI based e-mail alerting service

The integration of Internet services and telephony services is a new area for the development of telecommunications services. One example is an e-mail alerting service that uses the telephony network for e-mail notification. The EMA system is a computer telephony integration (CTI) application that checks a user's mailbox on the mail server and informs him/her over the phone when new e-mail arrives, eliminating the need for permanent Internet connection. The EMA system has a Web-based interface, enabling the user to configure service parameters. The EMA system is developed as a distributed and concurrent application. It consists of seven modules: the console, Web interface, Web handler, controller, voice machine, database, and mail checker, using communication solutions based on component object model (COM) technology. This article describes the structure of the EMA system, its implementation, and advantages for users     

轻量级工作流引擎的研究与实现

工作流技术是实现业务过程自动化的关键技术,工作流引擎是工作流管理系统的核心部件.在传统的关系数据库的基础上,提出了将XML和关系结构相结合,基于J2EE和Web Service架构的轻量级工作流引擎.此工作流引擎由组织模型、流程定义模型和引擎控制模型三部分组成.详细地给出相关的组织模型、流程定义模型和引擎控制模型的设计原理以及部分具体的实现方法.     

Verification of Web Services Compositions: Applying Model Checking to BPEL4WS

A composite Web service is a service implemented by combining the functionality of other Web services. There are some applications, like B2B E-commerce, in which an error in the specification of the composite service is critical, because of the high economic looses that it could cause. In this work we propose a framework for the verification of Web services compositions, called VERBUS. Its aim is to help the designer to find errors in the specifications at design time, thus increasing their reliability. Contrary to verification frameworks previously proposed for Web services compositions, VERBUS is a modular an extensible framework. It does not use a specific compositions definition language or a specific verification tool, like them. Instead, VERBUS is an open framework in which new definition languages and verification tools can be easily added. In order to show the feasibility of this environment we have implemented a prototype that can verify BPEL4WS compositions using the model checker Spin.     

A Privacy-Considerate Framework for Identity Management in Mobile Services

The subscribers’ personal information and services that mobile operators are able to provide to Web developers offer new and exciting possibilities in numerous domains. However, bringing mobile information services to the Web to enable a new generation of mobile Web services presents several research challenges on identity and privacy management. In this paper, we describe a framework for identity management in mobile services that empowers users to govern the use and release of their personal information. Our framework is based on a brokering approach that intermediates between the mobile operator’s information services and the Web service providers. By leveraging on Web services, identity management infrastructure and privacy enhancing technologies, our framework provides an effective, privacy-considerate delivery of services over the mobile Web environment. This paper describes the design principles and architecture of the framework as well as the feasibility, applicability and user-experience evaluation we have carried out.     

计算网格Portal的设计与实现

网格Portal就是网格的门户，网格Portal利用流行的Web技术提供Web界面方便用户运行网格应用程序．用户可以利用客户端浏览器通过网格Portal来方便安全透明地使用网格的各种计算资源。本文提出了计算网格Portal的设计技术和方法以及实现的功能，并分析了在设计中遇到的一些问题以及解决的办法。