移动Agent计算理论和形式化方法研究

研究了移动Agent计算的基础理论和形式化方法,包括π-演算、多态π演算、高阶π演算和环境演算等4种进程代数理论,分析了它们如何对Agent、位置、移动、通信、安全、命名、资源控制和动态配置等移动Agent计算的基本概念进行刻画,并比较了它们刻画移动Agent计算的优缺点,在此基础上提出了移动概念的分类与抽象.     

基于流演算的多Agent通信动作的研究

为扩展多Agent系统中Agents之间的交互特性,在流演算理论框架下研究了多Agent的通信动作.根据流演算理论和主体通信语言ACL,结合其它Agent的知识表示,引入了通信动作,给出了形式化描述,并讨论了通信动作如何影响通信双方的知识状态,并通过一个智能日程安排实例验证了上述理论,为构建适应动态.不完全可知环境下复杂的多主体系统提供了理论基础.     

用进程代数描述COM接口调用

用π演算模型来表现COM接口调用，在服务器是进程内或进程外组件的情况下，统一对COM接口调用中的重要部件(如客户、代理管理器、接口代理、存根管理器、接口存根、组件对象等)，用π演算进程给出了形式化的刻画，从而从总体上描述了COM接口调用的一系列流程．并通过此模型，清晰地表现出COM接口调用的进程透明特性，也进一步体现了演算对于描述进程通信及并行性的独特优势。     

基于自我意识的Agent通信语言研究

Agent间的通信目的是不断完善其自我意识,Agent间的通信内容是Agent对其自我意识的解释,Agent间的通信过程是Agent在其自我意识上的推理。在研究经典Agent通信语言的基础上,结合知识类别、自我意识、语气等相关研究成果,以能描述语义的互表性、模糊性、动态性和自我意识性的动态本体描述语言作为通信内容的表示工具,设计了一个基于自我意识的Agent通信语言,给出了该语言的消息结构和语用词,并通过实例来解释Agent间的通信过程是Agent在其自我意识上的推理。     

MAS交互协议的形式化描述和验证

在MAS的分析与设计中,Agent间的交互协议设计是极其重要的内容.特别是交互协议的正确性、有效性和可验证性尤为关键,因此形式化描述和验证多Agent的交互协议非常有必要.定义了用于描述多Agent基于对话的交互协议的一个演算,该演算是基于进程代数的并且独立于Agent的推理过程.该机制可以实现异构多Agent系统的交互协议验证.通过Agent会话环境的状态和演算的形式语义,可以验证会话协议的一些属性,例如:终止性、是否死锁等.该方法可以有效地解决交互协议的语义验证问题,因为协议的状态和Agent的行为由协议本身定义,并且可以避免基于状态搜索的状态空间爆炸问题.     

基于XML技术的Mobile Agent 在E-commerce中的应用

首先指出电子商务技术现存的一些问题,分析了Mobile Agent及XML的技术在电子商务应用中的优势,最后构建了一个基于Mobile Agent电子商务模型,此模型采用ACL—XML作为其中Mobile Agent的通信语言。     

Agent联盟通信机制的动态构造及其Ambient演算验证分析

为了提高多Agent系统中的通信效率,Agent在通信过程中可以形成若干个联盟,在每个联盟内设置一块黑板,Agent之间的通信通过黑板进行.本文针对当前Agent运行的网络拓扑结构经常变化的情况,提出了Agent联盟通信机制的动态构造模型.当网络的拓扑结构发生变化时,该模型可以重新调整Agent联盟通信机制,各Agent根据调整后的通信机制进行有效通信,从而适应新的网络拓扑结构的要求.最后,本文采用Ambient演算对该模型进行了分析验证,结果证明模型是正确可行的.     

高阶π-演算的互模拟理论研究

标签转移系统语义在早期的进程演算中取得了巨大的成功。基于标签转移系统，Milner与Park引入了互模拟的概念来描述进程间的等价性，互模拟从此成为整个进程演算中的理论基石。在经典的CCS进程演算中，标签转移系统用于描述进程的操作语义，然后在此基础上，互模拟概念通过如下方式被定义出来：两个进程若互模拟，不仅要满足任何一方的行为都要能够被另外一方匹配，同时要     

一个基于XML和CORBA的Agent通信框架

Agent通信机制是多Agent系统中Agent间相互协作、完成任务的基础和关键。文中在agent通信语言模式的基础上提出并设计了一个基于XML和CORBA技术的Agent通信框架，着重对该系统的原理、体系结构、模块功能以及其优点作了分析和描述。最后，结合KQML通信原语探讨了利用XML“封装”KQML消息的方法和作用。     

元Chi进程互模拟等价的一致性

Chi-演算是将π-演算中两类受限名统一后得到的.多态Chi-演算扩充了Chi-演算的通信能力,使得一次通信可传递多个信息.元Chi-演算是在省略多态Chi-演算的前缀操作子之后得到的子语言.研究了元Chi-演算的互模拟等价关系,证明了在某种意义下,元Chi-进程之间只有一个互模拟等价关系.     

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.     

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.     

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.     

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)

正~~