应用形式化与实时语言的面向方面方法

面向方面的软件开发方法是在面向对象开发方法的基础上，在AOP的支持下将贯穿系统的横切关注点提取出来，通过联结方式织入系统功能代码中的软件开发方法，该方法降低了软件开发的复杂性，提高了系统的灵活性和可维护性。形式化和实时语言为面向方面方法贯穿于实时软件开发提供了必要的支持，以形式化方法AO-RT-Z和实时语言PEARL为基础，给出了一种面向方面的实时软件开发框架，实现了软件生命周期各个阶段对面向方面的无缝支持，降低了实时软件开发的复杂性，提升了系统的可信度。     

实时系统的方面开发方法和应用模型

结合领域工程的方法,在某个领域内建立面向方面的软件开发AOSD框架是值得探讨的简单可行的方法,探讨了在实时系统开发过程中支持面向方面方法的几个关键问题及解决方案,提出了一种实时领域面向方面开发框架,降低了实时软件开发的复杂性,提升了系统的可信度,同时实现了实时软件开发各个阶段的无缝连接。     

面向服务的软件体系结构的形式化

用形式规格说明语言Z对面向服务这样一种新出现的分布式软件体系结构进行形式化，克服了原先面向服务体系结构的非形式化描述中的限制，为更好地进行面向服务的分布式软件开发提供了指导模型。     

基于面向方面的实时系统建模方法

分布式实时系统的实时特性可以利用面向方面软件设计方法来建模，把时间方面细分为确定的时间子方面、不确定的时间子方面和模糊时间子方面。根据面向方面技术，不同的时间子方面分别利用随机实时时序逻辑（SQTL）和模糊时间Petri网（FTN）来表示，并且每个不同形式化语言表示的子方面模型能够通过转化为时间自动机织入系统，实现系统的实时特性。     

一种严格的软件开发方法框架

本文系统地提出一种严格的软件开发方法，它基于逐步精化和重用组合的程序设计思想，将基于图形的半形式化方法和基于逻辑和转换系统的形式化方法镶嵌为一体，使软件开发中的“创造”和“演算”得到合理的折衷．本文已初步实现了面向该方法的实现工具．     

面向方面分布式系统形式化规格说明语言

分布式系统复杂性的不断增加以及对可配置性和可重用性要求的不断提高,需要面向方面软件工程方法的支持,而形式化方法能保证分布式系统的正确性。本文对分布式规格说明语言Ocsid进行了面向方面的扩展,讨论了面向方面的Ocsid的框架结构、语法要求、方面的联结和功能接口。定义了面向方面的Ocsid规格说明语言中叠加和组合的形式化描述,该形式化描述覆盖了各个精化阶段,使精化体系的各个独立视点被协调地组合,并能形式化地验证规格说明的时态属性和系统行为。本文的工作针对的是分布式系统的形式化规格说明,提出了面向方面Ocsid的形式基础和方面扩展,其基本思想同样适用于更一般的情况。     

面向方面软件重构等价性形式化证明方法

软件重构在不改变程序行为的情况下通过对代码进行小的改进以提升设计，使之更容易理解和维护，面向方面的程序设计是软件开发的新技术，为了有效实施面向方面的软件重构，需要开发者识别面向方面程序的转化规则。然而，由于使用的AOP语言没有形式化的语义定义，难以确认转化和重构的程序运行行为。本文对MCI操作语义的面向方面的扩展使之支持程序的方面特征的描述，定义了两个程序的观测等价，讨论了AspectJ的形式语义模型的建立，在MCI的语义下形式化地精确证明了Add Before-executing编程规则的观测等价性，其基本原理和方法可以适用于其他规则的证明，通过上述工作提出了面向方面重构的程序和它的面向对象程序原型等价性的证明方法。     

全国第4次程序设计语言发展与教学学术会议征文通知

全国第4次程序设计语言发展与教学学术会议定于2003年春季在江苏扬州召开。本次会议由东南大学承办，扬州大学、南京大学、武汉大学等院校协办，现将有关事项通知如下: 一、征文范围 程序设计语言历史、现状与发展,面向对象语言及相关技术,各类建模语言及其设计、实现与应用,面向网络应用的程序设计语言(XML、HTML、PERL等),其他各种新型程序设计语言(包括逻辑型语言、函数型语言等),程序设计语言分析、评价与比较,程序设计语言语法、语义与语用以及形式化描述技术与方法,并发、并行与实时程序设计语言,软件开发过程中各类描述语言(包…     

面向构件的系统开发及其形式化

回顾了软件构件与形式化方法的基本概念,介绍了软件构件的形式化,根据典型的面向构件的开发流程和基于形式化方法开发软件的特点,提出了一个基于形式化方法的面向构件的系统开发模型.针对目前面向构件的软件开发形式,提出了一些建议和方向.     

B语言和方法与Z、VDM的比较

1 引言形式化方法是建立在严格数学基础上的软件开发方法。软件开发的全过程中,从需求分析、规格说明、设计、编程、系统集成、测试、文档生成直至维护各阶段,凡是采用严格的数学语言、具有精确的数学语义的方法都称为形式化方法。形式化方法的一个重要研究内容是形式规格说明,即用具有精确语义的形式化语言书写的程序功能描述,它是论证程序是否正确的依据。形式化方法需要形式规格说明语言的支持,也可以说形式化方法的关键在于形式规格说明语言。形式规格说明语言提供了一个称为语法域的记号系统和一个称为语义域的目标集合,以及一组精确地定义哪些目标系统满足哪个规格说明的规则。根据对目标软件系统进行说明的方式分三种规格说明语言:     

An Overview of the Integrated Formalism RT-Z

We present an integration of the formal specification languages Z and timed CSP, called RT-Z, incorporating their combined strengths in a coherent frame. To cope with complex systems, RT-Z is equipped with structuring constructs built on top of the integration, because both Z and timed CSP lack appropriate facilities. The formal semantics of RT-Z, based on the denotational semantics of Z and timed CSP, is a prerequisite for preciseness and mathematical rigour. RT-Z is intended to be used in the requirements definition and design phases of the system and software development process. The envisaged application area is the development of real-time embedded systems. Received September 2000 / Accepted in revised form June 2001     

形式化语言RT-Z的合成及其应用

Z是一种确定相关数据特征的非常成功的形式化语言，却在构造动态行为方面的模型缺乏相应的功能；而Timed CSP是一种确定动态行为的功能强大的语言，但它没提供适当的结构来构造相关数据特征。文中通过形式化语言Z和过程代数Timed CSP合成一种新的形式化方法RT-Z，使得RT-Z在软件系统开发过程的需求定义和设计阶段能书写软件系统一致、简单的规格说明。     

面向方面的实时系统形式化开发方法

实时系统复杂性的不断增加以及对可配置性和可重用性要求的不断提高,需要如面向方面和基于组件的软件工程方法的支持,同时实时系统的可信性要求采用形式化方法来开发实时系统。本文试图建立一种面向方面的实时系统形式化开发方法,这种方法对RT—Z进行了面向方面和面向部件的扩展,并通过实时组件模型在需求和设计阶段提供了对基于部件的系统开发方法(CBSD)和面向方面的系统开发方法(AOSD)的支持。本文给出了面向方面的实时Z(AO—RT—Z)的组件模型的框架结构、语法要求、方面的联结和功能接口和非功能接口的定义,重点讨论并证明了面向方面的实时Z(AO—RT—Z)作为规格描述语言的健全性。     

The design and analysis of real-time systems using the ASTRAL software development environment

ASTRAL is a formal specification language for real-time systems. It is intended to support formal software development and, therefore, has been formally defined. The structuring mechanisms in ASTRAL allow one to build modularized specifications of complex systems with layering. A real-time system is modeled by a collection of state machine specifications and a single global specification. This paper discusses the ASTRAL Software Development Environment (SDE), which is an integrated set of design and analysis tools based on the ASTRAL formal framework. The tools that make up the support environment are a syntax-directed editor, a specification processor, a verification condition generator, a browser kit, a model checker, and a mechanical theorem prover. This revised version was published online in June 2006 with corrections to the Cover Date.     

The Core method for real-time requirements

The member companies of the Software Productivity Consortium develop large, mission-critical, real-time applications. For these companies, requirements are the top-priority problem in systems and software development. These requirements have driven the development of the Consortium Requirements Engineering (Core) method and its prototype CASE tools. Core is a single, coherent method for specifying real-time requirements that integrates object-oriented and forward models, integrates graphical and formal specifications, permits nonalgorithmic specifications, and provides a machine-like model. The Core requirements, component technologies, and conceptual model are discussed. Some important Core features are illustrated with an example of safety-shutdown software for a shipboard fuel-control system     

An automated verification method for distributed systems softwarebased on model extraction

Software verification methods are used only sparingly in industrial software development today. The most successful methods are based on the use of model checking. There are, however, many hurdles to overcome before the use of model checking tools can truly become mainstream. To use a model checker, the user must first define a formal model of the application, and to do so requires specialized knowledge of both the application and of model checking techniques. For larger applications, the effort to manually construct a formal model can take a considerable investment of time and expertise, which can rarely be afforded. Worse, it is hard to secure that a manually constructed model can keep pace with the typical software application, as it evolves from the concept stage to the product stage. We describe a verification method that requires far less specialized knowledge in model construction. It allows us to extract models mechanically from source code. The model construction process now becomes easily repeatable, as the application itself continues to evolve. Once the model is constructed, existing model checking techniques allow us to perform all checks in a mechanical fashion, achieving nearly complete automation. The level of thoroughness that can be achieved with this new type of software testing is significantly greater than for conventional techniques. We report on the application of this method in the verification of the call processing software for a new telephone switch that was developed at Lucent Technologies     

Z实时扩展及基于多视点的应用模式

RT—Z是由Z和经实时扩展的通信顺序进程timed CSP集成的用以描述实时系统的规格说明语言,它将Z对状态描述的优点和timed CsP对时序关系和并发描述的优点相结合,具有强大的描述能力;而基于时序转化系统的Z扩展适合描述系统状态的转化。给出了Z实时扩展的分类原则并从讨论了其应用特点,最后在分析RT—Z的语义集成的基础上提出了Z实时扩展的多视点应用模式。     

形式化与可视化结合的FDOOM软件开发方法

It is an important issue in Software Engineering that combines the formal development method with the vi-sual development method. This study is based on the transform method and rules between the UML model and the RAISE model.We developes a new software development Method FDOOM (Formal Development based on Object Oriented Modeling) that combine the UML with the RAISE together. And there is a demo in the end.     

Foundations of a new software engineering method for real-time systems

The design of a fault-tolerant distributed, real-time, embedded system with safety-critical concerns requires the use of formal languages. In this paper, we present the foundations of a new software engineering method for real-time systems that enables the integration of semiformal and formal notations. This new software engineering method is mostly based upon the ”COntinuuM” co-modeling methodology that we have used to integrate architecture models of real-time systems (Perseil and Pautet in 12th International conference on engineering of complex computer systems, ICECCS, IEEE Computer Society, Auckland, pp 371–376, 2007) (so we call it “Method C”), and a model-driven development process (ISBN 978-0-387-39361-2 in: From model-driven design to resource management for distributed embedded systems, Springer, chap. MDE benefits for distributed, real time and embedded systems, 2006). The method will be tested in the design and development of integrated modular avionics (IMA) frameworks, with DO178, DO254, DO297, and MILS-CC requirements.     

基于MVC模式的嵌入式软件测试开发环境设计

嵌入式软件仿真测试开发环境(ESTDE,Embedded Software Testing Development Environment)是嵌入式软件仿真测试平台(ESSTP,Embedded Software Simulation Testing Platform)的重要组成部分,是有效实现嵌入式软件实时、闭环测试的基础。MVC(Model-View-Controller)是一种开发交互式软件系统的典型体系结构模式,在分析和研究ESTDE功能、组成和工作原理的基础上,将MVC应用于ESTDE的设计当中,不仅保证了ESSTP的成功开发,而且提高了系统的可复用性和可适应性。