基于CORBA构件的软件体系结构模型

软件体系结构使超大规模软件设计的简化成为可能，提出了基于CORBA构件模型的软件体系结构并给出了一种软件体系结构的模型，通过给出ADL的BNF语法以及扩充CIDL编译器和CORBA的服务来实现此     

基于CORBA构件的软件体系结构实现模型

软件体系结构是一种新型的基于构件以及构件库的深层的软件复用,它的提出使超大规模软件设计的简化成为了可能.这里提出了基于CORBA构件的软件体系结构模型,通过给出ADL的BNF语法以扩充CIDL编译器和CORBA的服务,描述了其实现模型.     

一种图形化的CORBA体系结构描述方法

随着软件技术的发展，对于软件体系结构的研究越来越引起人们的重视。本文对CORBA分布式软件体系结构的描述需求和组件之间的依赖关系进行了较详细的分析，在此基础上提出了一种基于图形的软件体系结构描述方法，该方法把基于CORBA的分布式应用的软件体系结构视为一张逻辑图，在图上预定义一组操作，有助于CORBA应用的程序设计和维护。本文还在CORBA之上实现了一个原型，概括地介绍了具体的实现途径。     

基于CCM的软件构件组装技术的研究

OMG在推出的CORBA3．0规范中提出了一个构件模型（CCM）。CORBA构件不仅定义了对外提供的功能，而且还定义了构件所需要的外部功能，使得构件可以利用接口进行组装。同时CCM借鉴了EJB、COM等构件模型的优点，并充分利用了CORBA的开放性。本文在对CORBA构件模型以及模型组装框架中的相关技术进行研究的基础上，努力探索基于CCM的构件组装在系统开发中的应用。     

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。     

基于组件的软件可靠性模型

首先对不同的软件体系结构描述语言（ADL）进行分析，找出体系结构的共性，用抽象代数和一代阶逻辑理论对组件，连接器和软件体系结构的属性和动态行为进行讨论和描述，探讨不同连接形式下的软件体系结构，给出基于组件的软件可靠性模型，在此模型基础上，对基于组件的软件系统的可靠性计算模型进行研究，提出一种半Markov模型，并在理论上证明该模型的可用性，最后通过CORBA应用系统说明该可靠性模型在系统设计和可靠性计算方面的应用。     

基于ALOAF的分布式构件库框架模型

软件复用是解决软件危机的重要手段，构件库是软件复用的重要的技术支撑之一，为了进一步提高构件重用的可能性和效率，支持构件库的分布式访问，提出了基于ALOAF模型和CORBA技术的分布式构件库框架模型。文中讨论了开放体系结构的构件库框架（ALOAF）、CORBA技术和基于ALOAF分布式构件库框架模型的层次结构，并给出了基于中介服务器该模型的一种实现方案。在此基础上，以VisiBroker中间件和ORACLE数据库为支撑，采用JBUILDER9开发工具，开发了一个分布式构件库原型系统，验证了分布式构件库实现方案的可行性和有效性。     

软件体系结构演化信息捕获机制的方法研究*

提出了用扩充的构件描述语言xJBCDL描述软件体系结构的演化,并实现了从xJBCDL到基于构件软件配置管理模型的自动转换,从而达到自动捕获软件体系结构演化信息的目的.     

基于进程组构件模型的软件体系结构设计方法

软件工程的有效性在于进行体系化或系统化的设计，软件体系结构的好坏对系统的成败起着举足轻重的作用。本文针对并发系统，结合面向对象、构件以及软件复用的思想，提出了一种基于进程组构件模型的软件体系结构设计方法。最后介绍了采用该方法设计的iCALL系统。     

CORBA构件模型的通告服务集成研究与实现

通告服务是CORBA构件模型的重要服务之一。分析了一个满足CORBA规范的通告服务的体系结构,实现了基于CORBA构件模型的通告服务集成。     

European Community policy and the market

Abstract This paper starts with some reflections on the policy considerations and priorities which are shaping European Commission (EC) research programmes. Then it attempts to position the current projects which seek to capitalise on information and communications technologies for learning in relation to these priorities and the apparent realities of the marketplace. It concludes that while there are grounds to be optimistic about the contribution EC programmes can make to the efficiency and standard of education and training, they are still too technology driven.     

一种自适应子融合集成多分类器方法

融合集成方法已经广泛应用在模式识别领域,然而一些基分类器实时性能稳定性较差,导致多分类器融合性能差,针对上述问题本文提出了一种新的基于多分类器的子融合集成分类器系统。该方法考虑在度量层融合层次之上通过对各类基多分类器进行动态选择,票数最多的类别作为融合系统中对特征向量识别的类别,构成一种新的自适应子融合集成分类器方法。实验表明,该方法比传统的分类器以及分类融合方法识别准确率明显更高,具有更好的鲁棒性。     

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.     

Explanation and prediction: an architecture for default and abductive reasoning

Although there are many arguments that logic is an appropriate tool for artificial intelligence, there has been a perceived problem with the monotonicity of classical logic. This paper elaborates on the idea that reasoning should be viewed as theory formation where logic tells us the consequences of our assumptions. The two activities of predicting what is expected to be true and explaining observations are considered in a simple theory formation framework. Properties of each activity are discussed, along with a number of proposals as to what should be predicted or accepted as reasonable explanations. An architecture is proposed to combine explanation and prediction into one coherent framework. Algorithms used to implement the system as well as examples from a running implementation are given.     

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.     

Three Process Perspectives: Organizations, Teams, and People

This paper provides the author's personal views and perspectives on software process improvement. Starting with his first work on technology assessment in IBM over 20 years ago, Watts Humphrey describes the process improvement work he has been directly involved in. This includes the development of the early process assessment methods, the original design of the CMM, and the introduction of the Personal Software Process (PSP)^SM and Team Software Process (TSP){^SM}. In addition to describing the original motivation for this work, the author also reviews many of the problems he and his associates encountered and why they solved them the way they did. He also comments on the outstanding issues and likely directions for future work. Finally, this work has built on the experiences and contributions of many people. Mr. Humphrey only describes work that he was personally involved in and he names many of the key contributors. However, so many people have been involved in this work that a full list of the important participants would be impractical.     

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.     

基于复小波噪声方差显著修正的SAR图像去噪

提出了一种基于复小波域统计建模与噪声方差估计显著性修正相结合的合成孔径雷达(Synthetic Aperture Radar,SAR)图像斑点噪声滤波方法。该方法首先通过对数变换将乘性噪声模型转化为加性噪声模型,然后对变换后的图像进行双树复小波变换(Dualtree Complex Wavelet Transform,DCWT),并对复数小波系数的统计分布进行建模。在此先验分布的基础上,通过运用贝叶斯估计方法从含噪系数中恢复原始系数,达到滤除噪声的目的。实验结果表明该方法在去除噪声的同时保留了图像的细节信息,取得了很好的降噪效果。