面向测试的多视图构件模型

构件模型不仅是构件使用者理解、使用构件的重要依据，也是构件开发者和构件使用者测试构件的基础。目前已有的构件模型主要从分析设计以及使用的角度描述构件，对构件测试中的测试要素的描述并不充分。在分析已有构件模型和构件测试要素的基础上，提出了扩展UML2．0描述的面向测试的多视图构件模型，并给出了实例。     

基于XML的自适应软构件模型研究

在对软件自适应性研究现状分析的基础上，指出软构件自适应性主要表现在数据自感知和属性自定义，而软构件接口是设计和开发自适应软构件的关键。该文重点对软构件的自适应接口特征进行了研究，提出了一种基于XML的自适应软构件模型，并应用自适应软构件模型给出了一个统计软构件的实例。     

构件化仿真模型研究与自动化实现

为提高仿真系统的可扩展性、适应性、可重用性和互操作性等特性,将软件构件技术引入到仿真系统的开发中,对仿真模型构件进行深入的分析与研究,主要包括仿真构件的模型分析、仿真构件的元数据描述、仿真构件的实现结构分析。最后,设计并开发了仿真构件自动化开发工具,实现了仿真构件的代码框架自动生成与仿真构件的自动化组装。     

构件模型研究综述

基于构件的软件复用被认为是解决软件危机的重要手段,而描述构件本质特征及构件组合的构件模型是实现构件复用的关键技术。本文分析和研究了现有的构件模型,并根据构件接口和构件组合方式对各个构件模型进行了分类比较;结合已有的研究成果,展望了构件模型未来研究方向。     

一种软件构件仓库及实现方法

为了有效提高软件质量和开发效率,基于软件复用思想将软件模块和业务模块抽象为软件构件,提供以特定规则存储、查询、使用和进化构件的软件构件仓库.软件构件仓库的使用过程主要包括创建构件、查询构件、引用构件以及自动构建与持续集成等步骤.软件构件的逻辑模型采用了结合刻面分类法和键值对表示法的集成方法,定义了一种以URL方式表示构件信息的构件管理协议用于在系统内部存储、传递和解析软件构件信息,构件逻辑模型存储在关系型数据库中,用于描述构件包含的所有信息的模型,构件物理模型用来表达软件构件所对应的实体-文件的存储形式,保证构件仓库能够无障碍地升级和迁移.     

构件演化度量方法研究

构件演化是指构件根据用户的需求和技术的变化而不断改变,它是由一系列复杂的变化活动组成的。分析了构件演化的特点及其对度量的影响,根据GQM度量定义模型,给出了构件演化过程中的主要度量。希望通过度量和测评,能够有效地对构件演化进行控制,保持构件系统的一致性和稳定性。     

并行构件技术研究综述

并行构件技术作为并行软件工程的主要内容之一,对提高并行计算软件的生产率具有重要意义,也是并行软件工程的重要研究内容。并行构件技术研究现状包含并行构件模型、并行构件体系结构规范、并行构件框架3个方面。并行构件、接口、框架的定义和实现是区分不同并行构件体系结构规范的主要标准。如何在实现并行构件复用性的同时提高并行构件组成的应用系统性能,是这些技术发展的共同思想。单构件多数据、多构件多数据编程模型、多语言互操作技术、并行远程方法调用、MxN问题的解决方法、不同模型构件间的互操作都是并行构件领域的研究成果。并行构件技术的发展方向是开展对多语言互操作、性能预测、自适应构件、构件模型的互操作、多核硬件上的并行构件体系结构技术的研究。     

可信业务构件的框架模型及其实现机制

目前,对于业务构件模型的研究主要是关注于业务构件的识别和描述方法两方面,而业务构件的质量则较少得到关注。质量必然是满足构件使用者的基本前提,而业务构件的可信则全面体现了业务构件的质量。本文提出了可信业务构件的框架模型和四大可信要素,同时给出了可信要素的实现机制,重点阐述了逻辑可信的实现机制。     

基于OCL的服务构件特征语义描述模型

构件的语义特征是构件检索的主要依据,也是构件库的重点研究内容.然而,由于网络系统中存在分布、动态、数量众多的服务构件,很多构件之间存在一定的关联和依赖,因此如何有效地描述这些服务构件特征间的关联,是构件库管理模型需要进一步研究的一个重要问题.提出一种基于特征的构件语义描述模型,首先分别给出特征、特征空间和构件特征空间表示模型的定义.接着将构件特征间的各种关联和依赖关系分成自身约束、父子关系约束、显性约束和隐性约束4类,并采用对象约束语言对这些关系进行形式化描述,从而为模型提供了精确的语义支持.面向电子商务的构件特征子树的实例研究及其模型验证和实验结果证明了该模型的正确性与有效性.     

基于语义扩展的构件描述模型

根据构件模型的研究现状,针对目前的构件描述模型缺乏语义描述的支持,在刻面分类模式的基础上,提出了基于语义扩展的构件描述模型,采用OWL本体语言对构件本体的知识框架做了描述,并将此构件模型应用于教学评估系统,构造出了基于语义的软件构件检索体系构架,实现了对领域构件进行语义查询的目的.通过实验证明,该模型提高了构件检索的查全率和查准率.     

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.     

Call for Papers The 6^th International Conference on Grid and Cooperative Computing

Recent years have seen rapid advances in various grid-related technologies, middleware, and applications. The GCC conference has become one of the largest scientific events worldwide in grid and cooperative computing. The 6th international conference on grid and cooperative computing (GCC2007) Sponsored by China Computer Federation (CCF),Institute of Computing Technology, Chinese Academy of Sciences (ICT) and Xinjiang University ,and in Cooperation with IEEE Computer Soceity ,is to be held from August 16 to 18, 2007 in Urumchi, Xinjiang, China.     

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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