基于光机电一体化技术的文件智能交换方法研究

【目的】改变党政机关中采用手工文件登记本进行纸质公文交换与跟踪的落后手段,减少公文交换错漏现象,保障公文交换安全、准确、高效,实现纸质公文交换智能化。【方法】本文通过对光机电一体化技术、公文二维条码生成与自动识别定位等多种技术研究和集成创新,设计基于光机电一体化技术的文件智能交换关键装置和系统,包括文件交换箱系统、文件交换控制系统、公文二维条码识读装置、红外感应器件、条码扫描枪等,研究出一种文件智能交换方法、流程。【结果】实现了文件自动登记、交换、签收、流转跟踪、智能提醒等管理过程,打造文件交换"无人值守,背靠背"管理新模式。【结论】该研究成果技术先进,在纸质公文交换跟踪领域应用前景广阔。     

Internet与Intranet网间文件安全交换方法研究

军工企业按照国家相关部门的要求,涉密信息系统必须与国际互联网及其他公共信息网物理隔离。因此这些企业的内部资料外发和外来资料接收,通常要经过复杂的审批、交换流程。为了提高这种网间文件交换管理工作的便捷性及安全性,我们设计了一套"Internet与Intranet网间文件交换系统"。该系统基于B/S模式,采用Java及Sql Server等技术开发,分为内网系统和外网系统两部分。对于其中应用到的"内外网间文件交换"相关技术进行了阐述,给出了实现方法。通过对该系统的运行情况分析,这种文件交换方法在很大程度上解决了军工企业内外网间文件交换的便捷性和安全性之间的矛盾,可以在更多行业内推广应用。     

江苏省水利公文交换系统的建设与应用探讨

为提升江苏省水利系统内部各单位的文件运转、行政审批、任务督办等工作的信息化水平,江苏省水利厅建设了公文交换系统。回顾江苏水利公文交换系统的建设历程,介绍公文交换系统架构与功能,探讨主要应用技术,分析存在的问题,并对公文交换系统进一步应用与完善进行展望。     

蓝鲸分布式文件系统的客户端元数据缓存模型

在蓝鲸分布式文件系统中,客户端的所有元数据操作都是通过远程过程调用由元数据服务器完成,所有数据读写都是直接与存储服务器交换完成的.由于通信延迟,在客户端进行频繁数据读写时,元数据信息交换影响了整个系统的性能.我们设计了一种在客户端尽量缓存文件元数据信息的模型,有效地减少了元数据通信,缩短了整个读写过程的延迟,极大地提高了蓝鲸分布式文件系统的性能.     

对不同CAD系统之间数据交换方法的探讨

本文着重介绍了不同 CAD 系统之间数据交换标准 IGES 的交换方法特点、交换技术、文件结构以及数据交换中存在的问题、对策。     

基于XML的数据交换中间件的研究与实现

使用XML分别表示数据的结构信息和值信息,通过对数据结构文件和用户定义的规则文件进行分析生成映射文件,从而解决数据冲突.在此基础上,设计实现了一个基于XML的数据交换中间件(XDEM)系统.系统将数据交换处理流程与处理方法相分离,用户可以定制开发不同的处理插件,以满足交换过程的动态配置.这些极大地增强了系统的适应性和扩展性.     

剖析CAD系统中数据交换技术

本文着重介绍了不同CAD系统之间数据交换标准IGES和DXF的交换方法,讨论了它们的特点、交换技术、文件结构以及数据交换中存在的问题和对策。     

XTRANS:一个XML与关系数据相互转换系统

可扩展标记语言XML已逐渐成为了WWW中业务数据的交换标准,利用XML文档作为载体可以在各种异构的业务系统间交换信息,具有灵活、方便、快速的特点。该文提出了一种XML与传统关系数据相互转换的系统框架,XTRANS就是在此基础上实现的一个XML与关系数据的转换系统。系统借助一个映射文件来定制系统的转换细节,能够实现保序的转换。通过扩展映射文件可以使系统满足用户的不同需求。     

一种物理隔离系统的设计与实现

介绍了系统的结构框架，重点说明了利用PCI接口控制电路、网络接口电路和逻辑控制电路实现系统的自适应网络功能和内外网的安全物理隔离卡，该卡能自动地识别所连接网络设备的速率和工作方式，并将工作方式和速率调捂到正确的模式与之相适应。系统的管理软件包括安全策略管理模块、安全审计模块、数据库记录交换模、文件交换模块和邮件交换模块。以实现内外网数据安全高效的交换和管理，同时使用Windows DDK实现了基于NDIS的硬件驱动程序。这些关键技术的实现对相关课题研究具有普遍性的意义。     

P2P文件共享系统中的一种基于商品市场模型的访问控制机制

随着P2P文件共享系统日益成为流行的文件交换方式,其安全问题势必引起关注,而访问控制是P2P系统安全的关键技术之一.由于P2P系统具有分散性和动态性,传统的访问控制机制不能够直接应用于P2P文件共享系统中.而现有针对P2P文件共享系统的访问控制机制不能很好地解决大量并发文件下载请求或者爆发式的恶意文件下载对节点带来的侵害.针对上述问题,文中提出一种基于商品市场模型的访问控制机制(ACMCM),利用市场调节机制使得文件下载请求均衡地分布在多个文件提供者之间;下载文件的价格随着重复下载次数的增加而呈指数增长,有效遏制了恶意下载行为;通过在并发下载之间合理地分配下载带宽,使得并发文件下载占用的系统时间尽量缩短.ACMCM保留了P2P系统的分散性和动态性.最后给出了ACMCM的分布式协议的主要过程的流程.     

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