基于Qt的图形协同标绘系统设计与实现

本文利用Qt跨平台语言开发实现了一种基于透明IPC／S架构的图形协同标绘系统,解决了协同标绘访问控制、QPainter多线程冲突、多方标绘并发冲突等技术难点,并在某指控系统原型中予以具体应用。     

地图协同标绘感知系统的设计与实现

传统标绘系统都是单用户标绘，它不能满足多用户同时进行标绘的要求。文中设计构建了一个CSCW标绘系统，以解决远程多用户同时进行协同标绘行为的难题，并提出主席一用户模式体系结构，以协同标绘层和协同管理层为核心的系统框架以及分布式加锁策略等技术来解决协同管理、实时交互和协同感知，以此实现异地协同标绘系统。     

基于XML的态势图协同标绘系统设计与实现

传统协同标绘系统采用基于标绘符号库的标绘结果网络分发传输方式,信息维护困难,可靠性受网络性能的影响。因此,文章提出了一种采用XML保存标绘信息的方法,设计并实现了一个基于XML的态势图协同标绘系统。     

舰载指控中协同态势标绘系统的研究与设计

传统态势标绘系统都是单用户标绘,不能满足现代舰载指控系统分布式环境下协同进行人工标绘、自动标绘和知识库标绘的要求。针对上述问题,设计并实现一个计算机支持的协同工作标绘系统。描述其体系结构、系统框架和协同管理及标绘行为,给出并发控制策略及算法。该系统解决了分布式环境下多用户同时进行标绘的难题。     

基于Multi-Agent战场态势标绘系统的设计

由于仿真系统和作战指挥系统的网络化，网络化的战场态势标绘系统成为发展趋势。态势标绘系统采用多主体技术的群体协同工作方式，运用主体技术的分布性、协作性和智能性解决态势分布标绘的协同问题。该文首先分析了基于多主体技术的态势标绘系统必要性和新的特性，其次研究了系统的模板Agent内部结构和工作原理，再次，研究了基于多主体技术的态势标绘系统物理构成和系统运行逻辑，最后分析了原型系统在武器装备作战需求论证项目中的应用情况。该系统对于解决类似的分布式作业及协同问题有较好的参考价值。     

基于CSCW的协同编著系统

协同编著系统是CSCW的最主要应用之一,它允许异地多个用户并发地浏览和编著一份共享文档,以最大限度地发挥群体的工作效率。文章首先给出CSCW的基本概念及分类,然后讨论了一个实际协同编辑系统的系统模型及其信息组织结构、共享并发控制、用户身份认证、访问权限控制、系统信息加密、网络通信机制等一系列问题。     

基于ArcGIS的自然灾害协同标绘系统分析与设计

根据自然灾害的实际情况,详细分析了客户端、网络传输端和服务器端的功能.基于ArcGIS平台,设计并开发了协同标绘、协同感知和协同管理模块,构建了一个协同标绘系统,从而解决了在各种自然灾害中众多工作者尤其是异地人员无法协同工作的难题.测试结果表明,相对于单用户标绘系统,该系统在灾害信息提取中能极大地提高工作效率,为抗灾减灾赢取时间.     

基于XMPP的协同标绘系统的研究与设计

本文首先对XMPP协议进行了简要介绍,接着分析了XMPP协议的体系结构,提出了基于XMPP的协同标绘应用工作模型,然后在该模型的基础上结合现有的态势图形处理系统MGS,设计了一个基于XMPP的协同标绘系统,并就分布式协同标绘环境中出现的标绘冲突问题提供了一种有效的解决方案。     

基于角色访问控制的协同办公系统设计与实现

介绍了基于角色访问控制模型（RBAC）,给出了RBAC96中用户、权限、角色、会话集及角色的层次、授权等之间的关系。基于RBAC96设计并实现了协同办公系统,给出了该系统的功能模块、技术路线和实现方法。重点论述了本系统实现过程中的权限列表和角色列表的创建方法、协同办公中的访问控制特点及实现方法、权限控制子系统应用层开发流程等关键问题,提出了权限控制子系统服务器端三层B／S结构设计方法,解决了协同办公中的访问控制问题。实现协同办公系统所采用的方法和技术路线具有通用性。     

基于角色访问控制的协同办公系统设计与实现

介绍了基于角色访问控制模型（RBAC）,给出了RBAC96中用户、权限、角色、会话集及角色的层次、授权等之间的关系。基于RBAC96设计并实现了协同办公系统,给出了该系统的功能模块、技术路线和实现方法。重点论述了本系统实现过程中的权限列表和角色列表的创建方法、协同办公中的访问控制特点及实现方法、权限控制子系统应用层开发流程等关键问题,提出了权限控制子系统服务器端三层B／S结构设计方法,解决了协同办公中的访问控制问题。实现协同办公系统所采用的方法和技术路线具有通用性。     

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