一种面向Web服务的门户组件机制的设计与实现

通过门户组件(Portlet)来访问以Web服务形式提供的软件服务并展现其结果是通过门户(Portal)访问Web服务的一个核心问题。文中提出一种面向Web服务展现的Portlet(以下简称WSPortlet)机制来解决上述问题,通过遵循业界主流的Portlet规范,使用XSLT来对XML文档进行转换等途径保证了WSPortlet的规范性、有效性和灵活性,并且自主研发实现了WSPortlet系统(以下简称WSPS)。     

基于Jetspeed2.0的Portlet二次开发

门户为内部和外部用户访问Web站点的信息和应用提供了一个单一的访问入口,一个Portlet是门户中提供特殊服务或信息的窗口.介绍了基于公开源代码的企业信息门户软件Jetspeed,分析了最新版的Jetspeed 2.0的各个组成部分,并通过一个例子详细介绍了在Jetspeed2.0的基础上进行Porrlet二次开发的过程.基于Jetspeed2.0很容易对Porrlet进行二次开发,编写一些自己的Portlet,通过对这些Portlet的个性化设置,实现整个门户网站的个性化.     

企业门户Web资源整合及其实现的研究*

讨论了企业门户Web资源整合中的关键问题,分析并给出了相关整合技术方案。提出了一种特殊的远程门户组件Web服务（WSRP）实现机制WA2WP（Web Application to WSRP Portlet）,可将普通Web网站映射封装为虚拟门户组件发布;给出了改进的跨域单点登录机制SSO4EPI（Single Sign On for Enterprise Portal Integration）,可提供开放的接口形式和对跨安全域异构性的良好支持。最后结合应用实例说明以上方法的可行性和推广价值。     

远程门户组件的Web服务的研究与实现*

Web服务解决了异构环境中的互操作问题,但是并没有提供信息展示和用户交互的方法。采用远程门户组件的Web Service（WSRP）技术,提出了WSRP平台的概念模型,分析了远程门户组件的映射原理,研究了远程门户组件的对象池及管理算法,设计实现了一个远程门户组件的Web服务的运行平台,解决了Web 服务的展现问题,同时解决了Internert上的门户组件共享问题。     

基于门户框架的资源整合系统的设计和实现

在为软件企业提供服务的公共技术支撑平台的建设中,需要集成多类不同资源并通过统一的入口进行安全的访问和使用。通过对资源整合需求的分析,讨论了利用门户、Portlet、Web Services等实现资源整合的技术方案,实现了统一的用户管理和身份验证、资源整合和使用。     

集成化门户WJPortal开发与应用

针对现有门户在Portlet集成、访问模式、远程调用等方面存在的不足。结合WSRP框架,设计并开发了一个符合JSR168标准的开放式信息门户WJPortal。该门户采用远程Portlet代理、Portal容器和WSRP Stub等技术实现,通过Client、Interface、Provider三大组件的开发,为企业信息门户的开发提供了一个更加统一、便捷、开放、灵活的框架结构。基于WSRP门户构建了一个水利信息门户服务平台,给出了应用实例,提高了水利业务Portlet的集成能力。     

用Portlet技术实现数字化校园信息资源的整合

建设数字化校园是推动教育信息化的重要系统工程,而整合各种信息资源是当前研究的重点问题,其中有很多策略和技术问题需要解决.根据整合资源的需要,提出一个基于Portlet技术的门户解决方案,论述了门户框架的具体工作方式以及Portlet技术的实现原理,从而解决了数字校园建设中的系统集成,信息整合和个性化信息服务的问题.通过Portlet技术构建的校园信息门户,降低了门户实现和管理的成本,提高了工作效率,在数字化校园的建设中将会起着较大的作用.     

一种基于MVC模式的Portlet开发框架的设计与实现

为了解决Portlet应用提供商、门户提供商之间互不协调的问题,JCP组织发布了Portlet规范来提供不同门户和Portlet之间的互操作性。JSR规范中定义的繁杂的编程接口和Portlet运行时上下文给Portlet开发带来了特殊性和复杂性。引入一种基于MVC思想的Portlet开发框架OPDS,其提供了简洁的编程接口和配置方式,利用此框架进行开发将大大简化开发的复杂性,同时可加强Portlet应用中业务逻辑资源的复用性。     

基于Web Service的校园信息门户平台框架研究

高校信息门户UIP(University Information Portal)是面向全体师生的信息服务平台.文中研究通过门户、Web服务、身份认证、资源整合等技术来解决相关问题,给出了相应的技术方案.重点研究了Web服务集成、数据集成和统一身份认证等,并给出了-个实施资源整合的高校信息门户平台的框架.通过该平台可以有效地整合校园信息资源,为用户通过单点登陆的方式访问校园信息服务提供方便快捷的统一入口,同时通过风格管理、页面设置等功能,提供了个性化信息服务.     

基于Globus Toolkit的网格服务实现

在下一个十年里，许多业务将通过使用支持网格计算架构的Web服务在因特网上进行集成而实现彻底的转变。本文采用Globus提出的开放网格服务体系结构（OCSA）中的接口定义来实现网格服务，以数字化虚拟中国人（VCH）重建中的关键算法为例，简单的介绍了在Globus Toolkit3下服务封装的过程。用户使用网格门户页面或应用程序，对封装后的算法资源、计算资源进行访问，避免复杂算法的重复开发，打破了计算能力大小的限制、地理位置的限制。     

煤矿井下安全监控分站的设计及其仿真实现

为了设计一种具有低成本、低功耗、易操作、功能强且可靠性高的煤矿井下安全分站,针对煤矿安全生产实际,文章提出了采用MCS-51系列单片机为核心、具有CAN总线通信接口的煤矿井下安全监控分站的设计方案;首先给出煤矿井下安全监控分站的整体构架设计,然后着重阐述模拟量输入信号处理系统的设计过程,最后说明单片机最小系统及其键盘、显示、报警、通信等各个组成部分的设计;为验证设计方案的可行性与有效性,使用Proteus软件对设计内容进行仿真验证,设计的煤矿井下安全监控分站具有瓦斯、温度等模拟量参数超标报警功能和电机开停、风门开闭等开关量指示功能;仿真结果表明:设计的煤矿井下安全监控分站具有一定的实际应用价值.     

View-based model-driven architecture for enhancing maintainability of data access services

In modern service-oriented architectures, database access is done by a special type of services, the so-called data access services (DAS). Though, particularly in data-intensive applications, using and developing DAS are very common today, the link between the DAS and their implementation, e.g. a layer of data access objects (DAOs) encapsulating the database queries, still is not sufficiently elaborated, yet. As a result, as the number of DAS grows, finding the desired DAS for reuse and/or associated documentation can become an impossible task. In this paper we focus on bridging this gap between the DAS and their implementation by presenting a view-based, model-driven data access architecture (VMDA) managing models of the DAS, DAOs and database queries in a queryable manner. Our models support tailored views of different stakeholders and are scalable with all types of DAS implementations. In this paper we show that our view-based and model driven architecture approach can enhance software development productivity and maintainability by improving DAS documentation. Moreover, our VMDA opens a wide range of applications such as evaluating DAS usage for DAS performance optimization. Furthermore, we provide tool support and illustrate the applicability of our VMDA in a large-scale case study. Finally, we quantitatively prove that our approach performs with acceptable response times.     

A pragmatic multi-method investigation of discrepant technological events: Coping,attributions, and ‘accidental’ learning

Discrepant technological events or situations that entail a problem, a misunderstanding or a difficulty with the Information Technology (IT) being employed, are common in the workplace, and can lead to frustration and avoidance behaviors. Little is known, however, about how individuals cope with these events. This paper examines these events by using a multi-method pragmatic approach informed by coping theory. The results of two studies – a critical incident study and an experiment – serve to build and test, respectively, a theoretical model that posits that individuals use a variety of strategies when dealing with these events: they experience negative emotions, make external attributions, and adopt engagement coping strategies directed at solving the event, eventually switching to a disengagement coping strategy when they feel they have no control over the situation. Furthermore, users’ efforts may result in ‘accidental’ learning as they try to overcome the discrepant IT events through engagement coping. The paper ends with a discussion of the results in light of existing literature, future opportunities for research, and implications for practice.     

The Distributed Time-Triggered Simulation Scheme: Core Principles and Supporting Execution Engine

Distributed real-time simulation is a young technology field but its practice is under increasing demands. In recent years the author and his collaborators have been establishing a new approach called the distributed time-triggered simulation (DTS) scheme which is conceptually simple and easy to use but widely applicable. The concept was initiated in the course of developing a new-generation object-oriented real-time programming scheme called the time-triggered message-triggered object (TMO) programming scheme. Some fundamental issues inherent in distributed real-time simulation that were learned during recent experimental studies are discussed along with some approaches for resolving the issues. An execution engine developed to support both the TMOs engaged in control computation and the TMOs engaged in DTS is also discussed along with its possible extensions that will enable significantly larger-scale DTSs.     

Software-Konfigurationsmanagement in großen Softwareprojekten

Zusammenfassung Mit zunehmender Größe der Softwaresysteme verschärfen sich die für die Software-Herstellung typischen Probleme: Beherrschen großer Objektmengen, Erhalten der Systemkonsistenz, Kontrolle der ständigen Änderungseinflüsse und Gewährleisten einer langen Lebensdauer. Die Disziplin Konfigurationsmanagement bildet den methodischen Ansatz, diese Probleme besser zu beherrschen. Software-Konfigurationsmanagement faßt die Herstellung von Softwaresystemen als eine Abfolge von kontrollierten Änderungen an gesicherten Zwischen- und Endergebnissen auf. Dargestellt werden die Objekte und Funktionen des Software-Konfigurationsmanagements sowie die hierfür in großen Software-Projekten benötigten Methoden, Instanzen und Hilfsmittel.     

Information for Authors

正http://www.zju.edu.cn/jzus http://www.springerlink.com Aim The Journals of Zhejiang University-SCIENCE(A/B/C)are edited by the international board of distinguished Chinese and foreign scientists,and are aimed to present the latest developments and achievements in scientific research in China and     

Editorial:Brain-machine interface(BMI) and cyborg intelligence

正Brain-machine interfaces(BMIs)aim at building a direct communication pathway between the brain and an external device,and represent an area of research where significant progress has been made during the past decade.Based on BMIs,mind information can be read out by neural signals to control     

Information for Authors

正http://www.zju.edu.cn/jzus http://www.springerlink.com Aim The Journals of Zhejiang University-SCIENCE(A/B/C)are edited by the international board of distinguished Chinese and foreign scientists,and are aimed to present the latest developments and achievements in scientific research in China and overseas to the world’s scientific circles,especially to stimulate     

SCIENCE CHINA Information Sciences SUBJECT INDEX TO VOLUME 57(2014)

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Information for Authors

正http://www.zju.edu.cn/jzus http://www.springerlink.com Aim The Journals of Zhejiang University-SCIENCE(A/B/C)are edited by the international board of distinguished Chinese and foreign scientists,and are aimed to present the latest developments and achievements in scientific research in China and overseas to the world’s scientific circles,especially to stimulate