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关键词： Formal methods   Formal verification   Model checking   Interaction behaviors among industrial equipments  

摘要： With the rapid advancement of Internet of Things, interaction behaviors among their industrial equipments have been complex dramatically whereas they have been becoming a kind of safety-critical systems and high requirements for safety have been urgent unprecedentedly. Therefore, it has been a great challenge for practicing engineers to ensure temporal correctness and reliability of interaction behaviors among industrial equipments. Nowadays, pi-calculus, a process algebra and NuSMV, a symbolic model checker, have been widely applied to address this posed challenge respectively. However, they are always used separately. Because different formal methods focus on different aspects of systems, only one single method is still difficult to cope very well with the posed challenge. Therefore in this paper, an integrated framework of formal methods, which combines it-calculus with NuSMV, is constructed. pi-Calculus can definitely specify equipment interaction, and NuSMV can automate verification process. Especially counterexamples fed back by NuSMV can help practicing engineers to trace temporal violations. Furthermore, a cooperative traffic lights control strategy is illuminated to show how the framework works. (c) 2015 Elsevier B.V. All rights reserved.

关键词： Data aggregation   Data management   Cloud storage   Intelligent cloud services   Distributed services   Formal methods   Rule markup language  

摘要： The usage of Cloud Serviced has increased rapidly in the last years. Data management systems, behind any Cloud Service, are a major concern when it comes to scalability, flexibility and reliability due to being implemented in a distributed way. A Distributed Data Aggregation Service relying on a storage system meets these demands and serves as a repository back-end for complex analysis and automatic mining of any type of data. In this paper we continue our previous work on data management in Cloud storage. We present a formal approach to express retrieval and aggregation rules with a compact, yet powerful tool called Rule Markup Language. Our extended solution proposes a standard form to schemes and uses the tool to match the rules to the XML form of the structured data in order to obtain the unstructured entries from BlobSeer data storage system. This allows the Distributed Data Aggregation Service (DDAS) to bypass several steps when processing a retrieval request. Our new architecture is more loosely-coupled with a separate module, the new tool, used for transforming the XML entries to standard XML files which represent the final result. We model the dynamic behavior of the system using this new standard to ensure a simpler and efficient representation of the operations performed by the client while maintaining the constraints imposed by a distributed system running in the Cloud. Furthermore we prove that this method correctly performs the translation between the storage model's unstructured view of data and the client's structured objects.

关键词： UML建模思想   查课系统   用例  

摘要： 本文论述了应用UML建模思想分析和规划了智能查课系统的开发过程,确定系统需求和要实现的功能。用表示系统静态特征的UML类图、用例图和描述系统动态行为特征的时序图对其开发过程进行了不同层面的描述,以便读者理解。

关键词： lithium batteries   supercapacitors   unconventional architectures  

摘要： Batteries have become fundamental building blocks for the mobility of modern society. Continuous development of novel battery chemistries and electrode materials has nourished progress in building better batteries. Simultaneously, novel device form factors and designs with multi-functional components have been proposed, requiring batteries to not only integrate seamlessly to these devices, but to also be a multi-functional component for a multitude of applications. Thus, in the past decade, along with developments in the component materials, the focus has been shifting more and more towards novel fabrication processes, unconventional configurations, and additional functionalities. This work attempts to critically review the developments with respect to emerging electrochemical energy storage configurations, including, amongst others, paintable, transparent, flexible, wire or cable shaped, ultra-thin and ultra-thick configurations, as well as hybrid energy storage-conversion, or graphene-incorporated batteries and supercapacitors. The performance requirements are elaborated together with the advantages, but also the limitations, with respect to established electrochemical energy storage technologies. Finally, challenges in developing novel materials with tailored properties that would allow such configurations, and in designing easier manufacturing techniques that can be widely adopted are considered.

关键词： 服务组合   形式化方法   时间自动机   UPPAAL   模型检查  

摘要： 随着Web技术和商业应用的快速发展,Web服务组合技术已成构建电子商务应用的主要方法之一。当前,为适应快速变化的商业环境,对商业应用提出了实时性的要求,即限定服务的行为必须满足给定的时间约束条件。文中提出了一种形式化方法,用于分析与验证Web服务组合的时间约束行为。首先,扩展了Web服务接口描述语言,增加对时间约束的描述,然后定义一种时间行为自动机,用于刻画Web服务组合的时间行为,最终利用模型验证技术来自动验证这些行为是否满足给定的时间属性。通过对股票分析应用场景以及使用UPPAAL模型验证工具,表明该方法的可行性和有效性。

关键词： UML建模   人文教学   Web技术   系统   开发  

摘要： 针对当前国内教学系统应用现状,提出以某职业技术学院人文学院为例的基于web技术的网络教学平台,采用B/S访问模式、JSP技术和J2EE架构对系统进行设计,开发出具有用户登录、课程管理、在线自测等功能的可应用于人文学院学生的教育教学平台,体现了信息技术与现代教育结合的理念。

关键词： 形式化方法   软件方法学   形式化的软件开发  

摘要： 软件工程中的形式化方法是以数学理论为基础,建立的一种用来解决软件工程领域问题的系统性分析方法。形式化方法通过具有明确语义的形式语言来描述目标软件系统的行为和特征,为目标系统开发提供了一个模型化的有效设计和分析途径,保障了系统的安全性和可靠性。本文简单介绍了形式化方法的研究内容及分类,在软件方法学的研究背景下,对形式化方法在软件系统开发每一个阶段的应用进行了详细分析和综合评价。

关键词： 对象建模   建模语言   管理信息系统  

摘要： 针对电力企业管理信息系统的设计开发,详细探讨了UML建模技术从分析到实现过程在设计开发中的应用。UML技术作为先进的软件工程学方法,对于电力系统软件开发具有较强的实用价值。

关键词： 统一建模语言   用例图   学生管理系统  

摘要： 本文介绍了UML的建模过程及建模特点,首先描述了高校学生信息管理的需求分析及功能模块划分,然后重点以学生的学习管理模块为例,建立了系统主要的用例图、类图、顺序图。

关键词： 智能交通   信息物理系统   交通信息物理系统   体系结构设计   关键技术  

摘要： CPS是计算、通信和控制过程高度集成的系统,通过在物理设备中嵌入感知、通信和计算能力,实现对外部环境的分布式感知、可靠数据传输、智能信息处理,并通过反馈机制实现对物理进程的实时控制。在现阶段智能交通的基础上,结合信息物理系统(CPS)提出了一种分层式的交通信息物理系统(T-CPS)的模型结构,并对其每一层的设计进行分析。最后提出了目前研究T-CPS的关键技术,以及T-CPS对未来智能交通系统发展的影响。该模型有利于智能交通的研究,T-CPS作为智能交通新的发展方向,为下一代智能交通研究提供理论支撑。