基于CORBA的三层体系结构应用研究

公共对象请求代理规范（Common Object Request Broker Architecture，CORBA）是当前分布式领域中的热门技术，其应用前景广阔。CORBA技术具有跨平台、跨语言的特性，这些特性为分布式应用的开发提供了强有力的支持，具有广泛的应用基础，CORBA技术是构建三层应用理想的平台；对CORBA体系结构和规范，及实现进行了探讨。     

CORBA构件模型研究与实现

对几种构件模型进行了比较分析，研究了CORBA构件模型体系结构，提出了CCM构件平台实现技术及方法，并给出了采用国防科大计算机学院研制的CCM构件平台进行程序开发的步骤，体现出CORBA构件模型可以简化CORBA服务器方的应用开发过程，并能够提高CORBA的易用性。     

CORBA安全对象系统模型框架研究

CORBA服务规范中描述的安全服务定义了分布式对象系统的通用安全规范 .本文通过对 CORBA安全服务结构的剖析 ,介绍了 CORBA安全对象系统的框架模型 ,分别从安全系统框架的应用层、实现层和管理层三个层次详细描述了 CORBA安全服务实施安全细则和策略的过程 ,为 CORBA安全服务的实现和应用服务器平台安全服务通用框架的设计提供了指导 .     

基于组件的多层数据库应用设计

因特网技术的快速发展扩展了多层计算模式的应用范围，由Web服务器、应用服务器和数据库服务器形成的多层数据库模型形成了目前因特网应用的骨干。使用CORBA技术构建多层分布式系统已经成为当前的主流技术，它大大降低了健壮的、大规模企业级系统的开发复杂度。     

CORBA技术在网元层管理中的应用

介绍了CORBA技术在网元层管理中的应用及基于CORBA平台之一的Orbix上的网元层管理软件的开发过程,并阐述了如何在TMN中应用CORBA技术来解决分布式异构环境下的互操作问题。     

基于CORBA的信息系统设计与实现

本文在对CORBA（Common Object Request Broker Architecture)技术和企业信息系统特点分析的基础上，对CORBA平台上构建应用系统的需求分析，CORBA对象设计和采用Delphi 6 CASE实现的方法进行详细的介绍。     

Delphi中三层结构与CORBA的应用研究

三层结构和CORBA相结合是目前分布式系统的主要应用结构。首先说明了Delphi 5对三层结构和CORBA技术的支持机制 ;然后阐述了以CORBA为中间件的三层结构的典型构建过程 ,并介绍了应用实例     

CORBA构件模型在分布式体系结构中的应用

构件技术是目前软件开发的主流技术，CORBA构件模型是具有代表性的构件模型之一，分布式多层应用系统已成为目前重要的系统结构。文章讨论了基于CORBA构件模型和分布式多层体系结构的软件开发技术在一个分布式信息系统(即某钢管铸造企业管理信息系统)中的应用，并给出了设计步骤及形式化描述。     

CORBA与XML的集成在指挥自动化系统中的应用

在分析了CORBA与XML的基础上,提出了将CORBA与XML集成应用于指挥自动化系统中,并在传统的三层客户机/服务器模型上进一步改进,构建了一个集成模型.此模型发挥了CORBA强大的中间件传输能力和XML的灵活性、可扩展性.     

CORBA技术在网络安全深度防御体系中的应用

网络安全深度防御体系是网络安全解决方案的趋势所在，而CORBA是当前最优秀的分布计算平台之一，将CORBA技术应用在网络安全深度防御体系中成了一个新的思路和课题。文章简要介绍了深度防御体系的概念及CORBA技术在构建网络安全防御体系中的应用。     

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