移动Web服务的研究与应用

以一个移动旅游者娱乐系统为例,分析了移动Web服务的体系结构,探讨了上下文管理策略,将这种上下文管理引入到移动Web服务处理中,构建出基于上下文的Web服务处理过程--内容过滤和显示内容样式转换.通过实现该过程,提高了移动Web服务的服务质量和效率,实现了移动Web服务的智能化.     

基于语义Web技术的上下文感知的智能移动服务

语义Web技术应用于上下文感知的智能移动服务，通过构建上下文信息本体，使得移动服务的实体之间可以进行上下文信息共享和语义互操作，并进行上下文信息推理，实现智能服务。本文首先介绍了语义Web及本体技术，其次阐述了语义Web技术应用于上下文感知的移动服务，然后详细分析了智能移动服务中的上下文信息本体构建，包括通用的上下文信息本体、用户概况本体、情境本体以及服务本体等，接着介绍了相关的研究项目，最后进行展望和总结。     

基于上下文感知进程网络的Web服务组合方法

针对Web服务组合的个性化问题,提出一种基于上下文感知进程网络的Web服务组合方法,支持上下文感知组合系统的高层建模与系统的底层实现。采用CCS进程代数和标签转换系统,描述上下文感知组合模型的形式化语义,给出上下文感知系统模型的实现框架。分析结果证明了该组合方法的可行性。     

基于移动Agent的服务组合的建模

采用形式化描述Web服务组合,从很大程度上推动了Web服务组合技术的实际应用。但现有的Web服务组合形式化建模方法在利用形式化工具时,均未很好地解决建模的层次性问题。为解决上述问题,提出了将Web服务组合问题映射为一个基于移动Agent的层次化服务组合模型,系统模型分为系统服务层和Agent层。模型设计充分体现了移动Agent的移动性、自主性以及系统层(移动Agent运行环境)的控制性。最后给出实例说明该方法。     

基于移动Agent和Web服务的分布式地理信息查找研究

提出并实现了一种基于移动Agent和Web服务进行分布式地理信息查找的系统框架。根据系统的查找策略移动Agent可以对分布于网络中的地理信息进行自主搜索,利用移动Agent和Web服务之间的交互可以允许多种类型的应用程序透明访问查找服务。     

觉察上下文的Web服务研究与应用

现有的Web服务框架不能适应普适计算的特点,即无法为移动用户提供自定义的个性化的服务.通过对现有Web服务的扩展,提出了一个觉察上下文的自适应的Web服务开发与部署框架.在该框架中,客户端的上下文信息作为SOAP消息的头块被分布式地传递和处理,Web服务可为客户端提供自定义的个性化的服务.同时,上下文是可扩展的,通过自动的上下文处理,Web服务可自适应新的上下文而不需要改变Web服务本身.     

基于Agent的移动Web服务集成方案

结合Aglets平台和J2EE servlet技术,提出一种基于Agent的J2ME移动Web服务3层集成方案。在终端层,使用轻量级代理接入方式减少移动设备资源受限系统的负载需求。在Web接入层,采用Web服务标准接入方式确保异构移动平台的统一接入。在移动Agent层,通过多Agent协同工作保证系统高效性与灵活性。在此基础上,设计并实现一个移动进货比价系统。应用结果表明,该方案能提高无线环境下J2ME设备发现、访问Web服务的效率与健壮性。     

Web Services技术在钢铁物流仓库管理系统中的应用研究

针对现代钢铁物流园仓库管理需要,设计了一种基于移动终端的仓库管理系统。采用Web Services技术实现移动终端与数据库的通信。分析了Web Services应用架构模型,并按照Web Services模型来进行系统功能的总体设计。重点介绍了手持终端访问数据库的方法和Web服务的实现。设计的系统充分利用了手持终端的移动性和Web服务的易用性,操作方便灵活,提高了企业物流仓库管理的效率。     

基于Web服务的移动电子商务技术研究

分析了Web服务的体系结构和移动电子商务所需的相关技术,设计了移动Web服务的应用方案.最后,以移动电话自动售货系统为例,给出了移动Web服务的一个简单应用.     

基于Web服务的移动应用实现研究

基于对Web服务、移动应用、系统集成的发展现状的认识,通过实施移动保险申报系统这个项目,做到移动设备通过Web服务和后台服务器上的大型系统之间的无缝连接,并对Web服务的安全性以及移动应用的本地化进行了研究.Web服务是很好的系统集成方法,它与移动应用的结合是未来普及计算应用的一个重要发展方向.     

MCORE: a context-sensitive recommendation system for the mobile Web

Abstract: Recommendation systems for the mobile Web have focused on endorsing particular types of content to users. Today, mobile service providers have a more direct recommendation channel, namely the short messaging service. Therefore, mobile service providers should consider both the timing and context of recommendation messages (push messages) that are sent to users. Mobile service providers can learn context-specific user preferences by analysing mobile Web use logs and user responses to push messages. In this paper, we present a context-sensitive recommendation system that can be used to select the optimal context in which to send recommendation messages. We call this system the mobile context recommender system (MCORE). We compared user responses to push messages delivered in and out of suitable contexts as determined by MCORE. The precision of push messages delivered within a suitable context was higher than that of messages delivered outside of one.     

一种基于上下文协商的动态服务组合方法

普适计算的计算环境和交互信息动态变化,为了提供适时适地的服务,服务组合除了满足用户的需求之外,还要适应环境的变化.以面向普适计算的分布式文档管理系统为例,提出一种基于上下文协商的动态服务组合方法,适应普适计算环境下资源动态变化的特点,同时满足用户对服务的需求.首先定义上下文和带有上下文信息的服务模型;然后给出服务和设备以及服务和用户之间的上下文协商约束条件,根据约束条件提出基本算法实现服务动态组合,并对基本算法进行优化;最后通过原型系统和实验验证算法的性能和有效性,并通过实验数据分析上下文对于服务组合的影响.实验数据说明:提出的方法能够应用在普适计算环境中上下文敏感的服务组合问题上,提高服务组合的动态适应性和网络资源利用率.     

Context-aware middleware for resource management in the wireless Internet

The provisioning of Web services over the wireless Internet introduces novel challenging issues for service design and implementation: from user/terminal mobility during service execution, to wide heterogeneity of portable access devices and unpredictable modifications in accessible resources. In this scenario, there are frequent provision-time changes in the context, defined as the logical set of accessible resources depending on client location, access terminal capabilities, and system/service management policies. The development of context-dependent services requires novel middlewares with full context visibility. We propose a middleware for context-aware resource management, called CARMEN, capable of supporting the automatic reconfiguration of wireless Internet services in response to context changes without any intervention on the service logic. CARMEN determines the context on the basis of metadata, which include declarative management policies and profiles for user preferences, terminal capabilities, and resource characteristics. In addition, CARMEN exploits the mobile agent technology to implement mobile middleware components that follow the provision-time movement of clients to support locally their customized service access. The proposed middleware shows how metadata and mobile agents can favor component reusability and automatic service reconfiguration, by reducing the development/ deployment complexity.     

基于Web服务的开放式ERP系统设计与开发

针对企业中不同平台的异构资源集成问题，给出了一个基于Weh服务的ERP系统设计和开发实例，论述了系统设计和开发过程，说明了其SOAP协议的实现过程。系统主要采用Web服务技术解决移动计算在制造企业的应用时引起的异构平台间系统集成问题。系统对企业巾的Legacy系统实现很好的集成，使制造企业中的ERP系统具有适用于多平台的开放式结构。     

移动终端实现网络远程管理的研究和设计

结合目前流行的网络管理技术，提出采用一种新型的并较为实用的移动终端远程网络管理方案。该系统采用基于Web分布式网络管理系统的结构，继承了Web服务的优点，并融合了当前流行WAP和SMS技术，用移动终端的方式实现网络的远程管理，是对当前网络管理方案的一种重要扩展。本文重点讨论了其框架结构和部分功能的详细设计以及关键技术的具体实现。     

Managing Information for Effective Business Partner Relationships

Partner Relationship Management (PRM) is an information strategy that employs a set of applications focused on directly impacting an enterprise and its business partners' sales and services. Web services employ a distributed computing architecture that consists of many different computers that communicate over the Internet to form one system. the communication standards and protocols used in Web services are universally accepted. These Web services can be requested by client applications: Web based, windows, or mobile devices. This article presents an overview of PRM and Web services, and discusses the potential for improving partner relationship processes through the use of Web services.     

DaaS: Cloud-based mobile Web service discovery

The proliferation of smartphones and the recent advancement in ubiquitous wireless access have made mobile Web services more possible than ever before. However, finding relevant Web services that can match requests and fit user context remains a major concern. The challenges facing Web service discovery are further magnified by the stringent constraints of mobile devices and the inherit complexity of wireless heterogeneous networks. Cloud computing, with its flexible design and theoretically unlimited computing resources, is a viable approach to bootstrapping Web service discovery. The cloud can build bridges between mobile devices, as a convenient ubiquitous interface, and a backbone infrastructure with abundant computing resources. This paper introduces “Discovery as a service (Daas)”, a novel cloud-based discovery framework that addresses the core components of mobile Web service discovery. The DaaS framework lays the foundation of efficient mobile Web service discovery that takes into consideration user preferences and context. The experimental validation and performance evaluation demonstrate that DaaS can effectively rank relevant services according to the various user context and preferences, in addition to enhancing the precision of the discovered services. The prototype also shows that Web service clustering for discovery significantly improves the overall response time, while the cloud maintains scalability according to prespecified performance criteria.     

Toward Behavioral Web Services Using Policies

Making Web services context-aware is a challenge. This is like making Web service expose appropriate behaviors in response to changes detected in the environment. Context awareness requires a review and extension of the current execution model of Web services. This paper discusses the seamless combination of context and policy to manage behaviors that Web services expose during composition and in response to changes in the environment. For this purpose, a four-layer approach is devised. These layers are denoted by policy, user, Web service, and resource. In this approach, behavior management and binding are subject to executing policies of types permission, obligation, restriction, and dispensation. A prototype that illustrates how context and policy are woven into Web services composition scenarios is presented as well.      

Personal service areas for mobile Web applications

Location-based mobile services let wireless mobile users access Web-based information about resources in their immediate vicinities. The authors describe an algorithm that draws on context mobility elements, such as the user's travel direction and speed, to form personal service areas. Their experimental context-aware tourist information system (CATIS) leverages XML technologies and Web services to provide tourist information to mobile users based on these personal service areas and the users' preferences. Because Web service performance depends on the underlying databases, the authors also developed a layered caching scheme for storing environmental data to improve response time.     

基于网络服务的教学系统开发模型设计

基于网络服务(Web Services)的教学系统开发实际上是以XML数据为基础,通过SOAP协议集成互联网上的各种Web课件资源,使之协同完成一个特定教学任务的过程。在分析了Web课件集成和运行管理机制与实现方法的基础上提出了一种新的基于Web Services的教学系统体系结构,并探讨了开发Web课件所涉及的一些关键性任务及其具体的实现步骤。