Putting Web Services in Context

When considering the full range of Web service-related activities, it becomes clear that dealing with context is a major challenge, requiring greater expressiveness, reasoning capabilities, and architectural components than are provided by the current widely accepted building blocks of the Web services stack. This paper presents an informal overview of concepts, requirements and challenges for handling contextual knowledge in connection with Web services, and briefly discusses several interesting projects in this area of research.     

一个Web服务管理框架设计方案

简单地说,Web服务(Web Services)就是自描述模块化的业务应用程序,它可以通过可编程接口经由Internet将业务逻辑发布为服务,并通过XML,SOAP,WSDL,UDDI和ebXML等标准协议来查找、订阅和调用这些服务。文中针对日益增长的Web服务管理的需求以及存在的问题,对Web服务管理(Web Service Management)、Web服务管理原则和管理模式等做了深入的研究探讨,提出了一个Web服务管理框架设计方案,同时阐明了框架的内部组成模块以及各部分之间的相互关系。     

基于软件代理和上下文的Web服务合成方法

Web服务的诸多特性使得它非常适合于商务应用集成，工业界和学术界都希望能够通过合成多个Web服务从而获得增值的新服务。介绍两个概念以减少Web服务合成的复杂性：软件代理和上下文；并论述了在合成期间，软件代理之间进行会话以同意Web服务参与到合成中。     

Ontologies for Specifying and Reconciling Contexts of Web Services

This paper presents an ontology-based approach for the specification (using as a definition language) and reconciliation (using as a mediation tool) of contexts of Web services. Web services are independent components that can be triggered and composed for the satisfaction of user needs (e.g., hotel booking). Because Web services originate from different providers, their composition faces the obstacle of the context heterogeneity featuring these Web services. An unawareness of this context heterogeneity during Web services composition and execution results in a lack of the quality and relevancy of information that permits tracking the composition, monitoring the execution, and handling exceptions.     

A Context Adaptive Intrusion Detection System for MANET

Due to the ad hoc and mobile nature of a MANET, it is much more vulnerable to attacks than a wired network. As a result, there has been a significant research focusing on designing an Intrusion Detection System (IDS) for MANETs to detect anomalous behavior and misuse. However, each mobile node in a MANET typically has limited energy and thus it is not efficient to perform IDS functions within a node to detect every incoming packet. There is a need for an IDS to implement an intelligent control mechanism in order to monitor and recognize security breach attempts efficiently over a period of the expected network lifetime. By leveraging the Network Node Intrusion Detection (NNID) strategy, we developed a context adaptive IDS controller that advises an IDS to carry out intrusion detection while being prepared for a possible “cut through” if it is likely that the residual energy is not sufficient. By being embedded with the context adaptive IDS controller, the proposed Context Adaptive Intrusion Detection System (CAIDS) is able to adapt to the current node context (such as residual energy, security threats and traffic loading) for accommodating and inspecting new arriving packets. The performance is evaluated using a reward function that discovers an effective way to perform intrusion detection and delivers security benefits while meeting the energy budget. The numerical results show that CAIDS offers a good trade-off between lifetime performance and security. This study demonstrates empirically that the CAIDS model intelligently monitors and recognizes security breach attempts while adhering to the resource budget plan over the period of expected network lifetime.     

Advancing Reference Information Systems on the Web

Abstract

Most existing systems of automated reference information files are microcomputer-based. The advent of the World Wide Web has created a new and rich environment for advancing these files into cyberspace. The major attractions of building a Web-based reference information system are: (a) software is virtually “free,” (b) required training is minimal, (c) systems can be accessed by a variety of platforms, and (d) reference librarians around the world are able to share their expertise. The discussion is in the context of the evolution of reference information file systems. A prototype is described to show how to construct a basic Web-based system.     

An Adaptive Policy-Based Framework for Network Services Management

This paper presents a framework for specifying policies for the management of network services. Although policy-based management has been the subject of considerable research, proposed solutions are often restricted to condition-action rules, where conditions are matched against incoming traffic flows. This results in static policy configurations where manual intervention is required to cater for configuration changes and to enable policy deployment. The framework presented in this paper supports automated policy deployment and flexible event triggers to permit dynamic policy configuration. While current research focuses mostly on rules for low-level device configuration, significant challenges remain to be addressed in order to:a) provide policy specification and adaptation across different abstraction layers; and, b) provide tools and services for the engineering of policy-driven systems. In particular, this paper focuses on solutions for dynamic adaptation of policies in response to changes within the managed environment. Policy adaptation includes both dynamically changing policy parameters and reconfiguring the policy objects. Access control for network services is also discussed.     

The UM-MAIS Methodology for Multi-channel Adaptive Web Information Systems

Multichannel Adaptive Web Information Systems (WISs) are emerging as a new class of information systems, characterized by their powerful use of mobility and context-awareness. Different methodologies have been proposed so far for the analysis and design of Multichannel Adaptive WISs, specifically focused on the front-end layer or the back-end layer, but no methodology has aimed to cover all the lifecycle and to design all the components that characterize Multichannel Adaptive WIS. This paper fills such a gap, by presenting UM-MAIS (Unified Methodology for Multichannel Adaptive Information Systems), a new methodology that capitalizes on well-established existing methods. It supports the analysis and design of the various components of Multichannel Adaptive WISs (including the user’s experience) in a comprehensive and unified manner with special emphasis on context modeling, personalization, and adaptation.     

企业综合物业管理信息系统的设计与开发

综合管理信息系统在企业管理中起着非常重要的作用,本文通过一个用于房地产公司的综合物业管理信息系统的实例阐述了设计开发综合信息系统的通用方法。     

一种基于上下文和Web应用的随机算法

在用户与Web应用进行交互的过程中,会产生大量带有语义的上下文信息.其中一些上下文具有随机性,比如点击的时间与次数,用户提交的数据等.本文利用这类上下文信息作为随机因子,结合内插模型,设计了一种随机算法.同时提出了使用网页前端技术实现该算法的方法.经过仿真分析,证明该算法可以生成正态分布的随机数并且在实际应用中取得了满意的结果.     

Context Sequence Matching for XML

Context and sequence variables allow matching to explore term-trees both in depth and in breadth. It makes context sequence matching a suitable computational mechanism for a rule-based language to query and transform XML, or to specify and verify web sites. Such a language would have advantages of both path-based and pattern-based languages. We develop a context sequence matching algorithm and its extension for regular expression matching, and prove their soundness, termination and completeness properties.     

基于Web的自适应考试系统

本文介绍了计算机化自适应考试（Ｃｏｍ ｐｕｔｅｒｉｚｅＡｄａｐｔｉｖｅ Ｔｅｓｔ）的基本理论和过程。并提出了一个基于Ｗｅｂ自适应考试系统的框架。     

一种基于SNMP的WEB网络管理系统的设计与实现

本文首先对Web服务在网络管理中的应用情况进行了详细分析与介绍,然后设计了一个SNMP基础上结合Web技术的网络管理系统模型,在降低网络管理带来的网络拥挤方面、提高网络管理应用的动态集成能力方面和网络管理中的安全机制方面探讨了Web服务所带来的新特性。在该模型中,基于Web服务的管理和现在Internet中广泛存在的传统的SNMP Agent之间互相通信,实现网络管理操作,通过引入Web技术来解决在庞大复杂的网络系统中各种网络管理软件的互操作问题,实现分布式网络管理。     

企业信息系统安全体系结构的研究

随着计算机网络Web服务应用的不断深化,企业信息系统的安全性问题日益突出。在此背景下,本文介绍了基于Web服务的企业信息系统安全体系结构特点及其研究现状,分析了企业信息系统安全体系结构的基本原理,并研究了企业信息系统安全体系结构的构成因素,最后提出了一种基于Web服务的企业信息系统安全体系结构模型,保证系统的可靠性和扩展性。对于企业信息系统安全体系结构的研究和发展,具有一定的现实意义。     

跳水运动员运动训练管理信息系统的设计与实现

论文根据跳水运动员训练的实际需要,结合网络、数据库、计算机、多媒体、图像处理等技术,提出了一个基于B／S模式的跳水运动员运动训练管理信息系统,并提供了一个训练信息处理平台。在基于Browse／Server结构的跳水运动员运动训练信息管理系统的设计与实现过程中,较为详细地分析了系统功能结构,功能子系统组成,系统信息来源、结构及流程,同时还阐述了系统功能结构、网络结构、连接方式和系统软件功能的设计,介绍了在该交互式Web系统设计中使用的Web—数据库以及ASP动态主页技术,并结合实例对有关设计工作进行了说明。     

基于web服务的Honeynet管理

基于SOAP协议的web服务很适合用于开发高效的,互操作的管理系统.本文介绍了一种基于web服务的Honeynet管理接口.通过该管理接口可以配置管理Honeynet的各项子服务,从而对高效的管理Honeynet有一定的帮助.     

基于SOA的通用权限管理服务

面向服务的架构在实施中遇到了诸多困难,如增加系统的复杂性、难以与原有IT资源整合等,针对这些问题,在研究实现SOA的基本策略的基础上,分析了SOA的柔性,提出了通用权限管理服务、服务的本地化等方法。利用XML—Beans＋web服务模型和基于角色访问控制方法实现了基于面向服务架构的通用权限管理服务,并应用到基于Web的PLM系统中,充分说明了SOA可以有效地实现与原有IT资源的整合而不增加系统的复杂性。     

一种上下文感知的旅游信息服务推荐方法

在旅游时游客很难预先知道自己的旅游需求,并且旅游偏好在旅游过程中也会发生变化。为了给游客提供即时高效的个性化信息服务,本文将上下文信息引入推荐系统,结合案例推理和神经网络,根据游客的喜好为用户提供个性化信息服务推荐。实验表明,该方法可较好克服推荐系统新用户冷启动的问题,提高旅游信息服务的准确率和提升游客服务的满意度。     

网络化制造企业的异构系统集成控制模型

为提高制造系统的智能重构能力,快速地开发、设计和制造产品,提出网络化制造企业的异构系统集成控制模型;构建了基于公共对象请求代理体CORBA与多智能体系统MAS的企业内部集成控制体系结构,并论述了内部通信的实现机制;利用Web services技术,通过构建SOAP远程服务代理来实现合作企业间远程协同生产控制;并通过联网加工试验验证了所构建的集成控制模的可行性和实用性.