基于移动Agent的语义挖掘系统研究

语义Web是在分布式环境下构建复杂系统的一种新兴技术。在分析语义Web与移动Agent的基础上，提出了基于移动Agent的语义挖掘系统模型。该系统由三个层次构成：通信网络层、移动Agent平台以及基于语义Web的移动Agent服务，包括推理服务、查询服务、匹配服务、本体服务和语义扩展服务等。并且给出了改进的：粒群优化算法作为移动Agent路由判定算法，为下一步研究开发比较成熟的软件产品奠定了良好的基础。     

基于移动Agent的Web服务系统模型研究与构建

随着电子商务应用的不断发展,对于基于Web的网络服务的要求不断增强。在分析了Web服务现状的基础上,指出了其存在的不足,并阐述了移动Agent节约网络带宽、负载均衡、并行计算等方面的应用优势,结合这些优势,给出了一个基于移动Agent的Web服务系统框架模型。该模型通过可信Web服务中心监管Agent及其宿主的行为,从而在一定程度上解决了Web服务以及移动Agent的安全问题,从而建立了一个安全、可靠的基于移动Agent的Web服务系统,并对解决移动Agent的安全问题作了有益的探讨。     

基于移动Agent的Web服务系统模型研究与构建

随着电子商务应用的不断发展,对于基于Web的网络服务的要求不断增强.在分析了Web服务现状的基础上,指出了其存在的不足,并阐述了移动Agent节约网络带宽、负载均衡、并行计算等方面的应用优势,结合这些优势,给出了一个基于移动Agent的Web服务系统框架模型.该模型通过可信Web服务中心监管Agent及其宿主的行为,从而在一定程度上解决了Web服务以及移动Agent的安全问题,从而建立了一个安全、可靠的基于移动Agent的Web服务系统,并对解决移动Agent的安全问题作了有益的探讨.     

基于移动Agent的服务组合的建模

采用形式化描述Web服务组合,从很大程度上推动了Web服务组合技术的实际应用。但现有的Web服务组合形式化建模方法在利用形式化工具时,均未很好地解决建模的层次性问题。为解决上述问题,提出了将Web服务组合问题映射为一个基于移动Agent的层次化服务组合模型,系统模型分为系统服务层和Agent层。模型设计充分体现了移动Agent的移动性、自主性以及系统层(移动Agent运行环境)的控制性。最后给出实例说明该方法。     

移动Agent与Web服务器集成框架研究

Internet最为广泛的应用就是由Web服务器提供的WWW服务，如果能将Web服务器构造为一个能够容纳Agent的平台，将会极大地推动移动Agent在Internet上的应用。在保留现有Web服务器的情况下，如何来支持和应用移动Agent，这就涉及到移动Agent与Web服务器的集成问题。本文从应用的角度给出了一个基于中间件的集成框架，较好地解决了移动Agent与Web服务器的集成问题。     

基于移动Agent的Web服务组合执行框架设计

对Web服务组合技术深入分析，从Web服务组合的控制执行层面入手，结合移动Agent的优势，提出一种基于移动Agent的Web服务组合执行框架。对于复杂Web服务组合，框架可将其分解成若干相互依赖的任务片，其中任务片对应一个线性的子Web服务组合，然后分配给多个移动Agent进行分布式执行。     

一种容错的移动Agent名字解析机制的研究

当一个移动软件Agent迁移到网络中不同的主机时,相互合作的Agent需要通过通信来定位它.名字服务负责给Agent命名,在分布式系统中定位这样的Agent.名字服务有三个特征容错、可伸缩性和高效的名字解析.大多数名字服务都支持有效的名字解析但没有地址容错和可伸缩性.本文提供一个基于home容错的名字服务(HFNS),它能提供容错和可伸缩性.     

一种基于异构机群环境下的移动Agent系统分布式容错机制

容错机制就是评价移动Agent系统服务质量的重要标准,同时,它也是移动Agent技术优势得以体现的重要手段.本文提出一种基于异构机群环境下的移动Agent系统分布式容错机制,并分析了当前的种种Agent系统容错机制,以期进一步完善MAS容错策略.     

基于移动Agent的GIS动态服务技术

利用Web服务和Agent特性来解决空间信息GIS领域的动态服务问题.提出了基于Web和Agent的GIS动态服务模型,阐述了动态服务原理和相关的实现技术,特别是利用创建、迁移GISAgent和构件下载策略,以及GISAgent和Web服务的交互操作和集成技术,实现了用功能构件的移动代替海量空间数据的移动,提高了分布式网络的计算速度,改进了空间数据处理的瓶颈问题.     

一种基于Agent的Web服务工作流管理系统模型

本文介绍一种基于多Agent的Web服务工作流管理模型，该模型利用Darpa Agent标记语言结合Agent信任管理来智能地发现Web服务，使工作流管理系统更具灵活性和适应性，并增强了系统的互操作性及跨组织性。     

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.     

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)

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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