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1.
嵌入式建模中带有时间扩展的UML状态图的形式化方法   总被引:4,自引:0,他引:4  
面向对象建模语言UML(Unified Modeling Language)已广泛用于嵌入式系统建模,但它在嵌入式实时系统建模时存在概念模型形式化复杂和状态图对时间约束方面的建模功能不强的问题,针对这些问题,提出一种对UML状态图进行时间扩展的方法,并提出利用"可执行UML"对带有时间扩展的UML状态图形式化的方法.  相似文献   

2.
基于着色时间Petri网的实时系统的形式验证   总被引:1,自引:0,他引:1  
嵌入式实时系统多数应用在安全性要求较高的场合,因此需要保证系统的正确性.复杂性不断增加的实时系统迫切需要在系统开发早期引入形式化分析技术来验证系统的期望性质.时间Petri网是有严格数学基础的图形表达工具,适合对实时系统建模;时间自动机(Timed Automata,TA)有成熟的验证工具,被广泛用于实时系统的模型检验和验证.本文提出一种基于着色时间Petri网(Colored Time Petri Net,CTPN)的实时系统的验证方法,用CTPN对带有控制流和数据流的实时系统建模,通过转换规则将CTPN模型转换成语义等价的TA模型,利用模型检验工具UPPAAL验证系统的性质.最后,用实例证明此方法有效.  相似文献   

3.
统一建模语言UML在嵌入式系统设计建模中已经获得了广泛的认可,并有很多成功的应用,但UML存在时间约束描述能力不强和所建模型形式化复杂、验证难的问题。针对上述问题,本文提出了使用UML扩展机制对UML状态图进行时间扩展,建立系统状态一约束一事件矩阵来对模型进行形式化描述的方法。该方法解决了UML在嵌入式系统建模时存在的问题。应用实例和实验结果验证了该方法的可行性和有效性。  相似文献   

4.
一种软件自适应UML建模及其形式化验证方法   总被引:1,自引:0,他引:1  
软件自适应的建模和形式化验证是提高自适应软件开发效率、保证自适应软件可靠性的基础,现有研究中软件自适应可视化建模与形式化建模相隔离,一定程度上阻碍了自适应软件的开发.为此,提出MV4SAS的方法,将可视化的UML与严格化的时间自动机相结合,用于软件自适应的建模和形式化验证.首先,应用UML扩展机制引入新的构造型、标记值和约束条件,定义软件自适应建模设施,在此基础上构造软件自适应结构模型和行为模型;然后,根据定义好的转换算法将软件自适应行为模型转换为时间自动机网络,建立软件自适应形式化模型;最后,定义一组软件自适应形式化验证性质,并利用模型检测工具UPPAAL验证软件自适应模型的可靠性.案例研究表明,该方法可有效降低软件自适应建模和验证的复杂度,提高软件自适应的建模效率和模型可靠性.  相似文献   

5.
实时系统动态行为模型的一种形式分析方法*   总被引:1,自引:0,他引:1  
戎玫 《计算机应用研究》2009,26(9):3365-3368
提出了一种基于统一建模语言UML 2.0的实时系统动态行为模型的形式分析方法。首先给出了UML顺序图的形式化描述,分析了UML顺序图中事件之间的关系;在此基础上,给出一种对象自动机来描述每个对象在UML顺序图描述的场景中所参与的事件序列的方法,并将该方法扩展到带有组合片段的UML 2.0顺序图;最后通过分析UML 2.0顺序图中的时间建模机制,给出了从UML 2.0顺序图中提取时间约束得到时间自动机的算法。  相似文献   

6.
基于UML的嵌入式系统模型验证机制的研究   总被引:8,自引:0,他引:8  
随着嵌入式系统在各个领域的广泛应用,嵌入式系统变得越来越复杂,研究一种支持嵌入式系统从分析、设计、验证到编码这一整个开发过程的模型系统及建模方法变得越来越重要。UML(UnifiedModelingLanguage,统一建模语言)作为面向对象的分析与设计技术的代表,已经获得了广泛的承认,并在多个领域中有成功的应用。然而,UML是一种符号化语言系统,其语义采用自然语言描述,没有完全形式化,无法精确和严格地描述模型的行为从而实现模型的验证。为了解决这个问题,文章提出了一种用于嵌入式系统UML模型验证的方法,其核心是可执行(Executable)UML,它是UML的增强性子集,采用与UML相同的符号表示法,并集成了状态图(StateChart)所用的形式化语义定义。嵌入式系统的UML模型经过语义分析能够很方便地生成可执行UML模型,并实现系统模型的验证。  相似文献   

7.
UML广泛应用于软件建模,但缺乏有效的模型检测的方法,使用形式化方法对UML模型进行分析,可以发现UML模型的设计问题,提高UML模型的质量。对象着色Petri网是一种拥有接口库所的模块化着色Petri网,既是一种图形化建模工具,又是具有严格的语法语义定义的形式化方法。通过引入事件托肯,改进了将UML模型转换为对象着色Petri网的方法,结合实例将UML状态图和协作图映射为对象着色Petri网模型。并用着色Petri网的方法和工具对模型讲行了分析.验证了模型的一系列性质.  相似文献   

8.
一种基于CSP的面向方面状态图形式化描述方法   总被引:1,自引:0,他引:1  
面向方面通过分离关注点解决软件系统中的横切问题,通过扩展UML可实现对面向方面的建模。本文利用UML的扩展机制将方面加入状态图中,描述了状态图中的方面与核心组件以及方面之间的编织,然后利用进程代数的形式化语义描述了扩展后的UML状态图,克服了扩展UML描述状态图的缺乏形式化动态语义,不利于对模型进行形式化验证和证明的缺
点。最后,以ATM自动取款机为例验证了基于CSP的面向方面状态图形式化描述的有效性。  相似文献   

9.
离散事件仿真规范DEVS形式化的一个重要不足在于它缺乏一种标准的、图形化的描述形式。该文研究提出了一种将DEVS的原子模型与复合模型分别映射到UML的状态图和组件图的方法,并用形式化的数学方法对DEVS原子模型向UML状态图的映射过程进行了描述与构造。这种映射将DEVS规范融入到了UML的描述形式当中,将DEVS的抽象化描述与UML的表示能力、计算机处理能力结合起来,为两种建模形式的统一提供了一个可行的思路。该文研究的成果在C^4ISR系统总体方案规范化建模中得到了逐步的应用。  相似文献   

10.
王红英  张桂戌 《微机发展》2007,17(4):182-185
UML广泛应用于软件建模,但缺乏有效的模型检测的方法,使用形式化方法对UML模型进行分析,可以发现UML模型的设计问题,提高UML模型的质量。对象着色Petri网是一种拥有接口库所的模块化着色Petri网,既是一种图形化建模工具,又是具有严格的语法语义定义的形式化方法。通过引入事件托肯,改进了将UML模型转换为对象着色Petri网的方法,结合实例将UML状态图和协作图映射为对象着色Petri网模型。并用着色Petri网的方法和工具对模型进行了分析,验证了模型的一系列性质。  相似文献   

11.
Abstract This paper describes an approach to the design of interactive multimedia materials being developed in a European Community project. The developmental process is seen as a dialogue between technologists and teachers. This dialogue is often problematic because of the differences in training, experience and culture between them. Conditions needed for fruitful dialogue are described and the generic model for learning design used in the project is explained.  相似文献   

12.
European Community policy and the market   总被引:1,自引:0,他引:1  
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.  相似文献   

13.
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。  相似文献   

14.
Development of software intensive systems (systems) in practice involves a series of self-contained phases for the lifecycle of a system. Semantic and temporal gaps, which occur among phases and among developer disciplines within and across phases, hinder the ongoing development of a system because of the interdependencies among phases and among disciplines. Such gaps are magnified among systems that are developed at different times by different development teams, which may limit reuse of artifacts of systems development and interoperability among the systems. This article discusses such gaps and a systems development process for avoiding them.  相似文献   

15.
This paper presents control charts models and the necessary simulation software for the location of economic values of the control parameters. The simulation program is written in FORTRAN, requires only 10K of main storage, and can run on most mini and micro computers. Two models are presented - one describes the process when it is operating at full capacity and the other when the process is operating under capacity. The models allow the product quality to deteriorate to a further level before an existing out-of-control state is detected, and they can also be used in situations where no prior knowledge exists of the out-of-control causes and the resulting proportion defectives.  相似文献   

16.
Going through a few examples of robot artists who are recognized worldwide, we try to analyze the deepest meaning of what is called “robot art” and the related art field definition. We also try to highlight its well-marked borders, such as kinetic sculptures, kinetic art, cyber art, and cyberpunk. A brief excursion into the importance of the context, the message, and its semiotics is also provided, case by case, together with a few hints on the history of this discipline in the light of an artistic perspective. Therefore, the aim of this article is to try to summarize the main characteristics that might classify robot art as a unique and innovative discipline, and to track down some of the principles by which a robotic artifact can or cannot be considered an art piece in terms of social, cultural, and strictly artistic interest. This work was presented in part at the 13th International Symposium on Artificial Life and Robotics, Oita, Japan, January 31–February 2, 2008  相似文献   

17.
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.  相似文献   

18.
《计算机科学》2007,34(4):148-148
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.  相似文献   

19.
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.  相似文献   

20.
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.  相似文献   

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