基于ArcIMS与Ajax的WebGIS应用研究

介绍Ajax技术及其实现原理、ArcIMS的体系结构和工作原理,提出基于ArcIMS与Ajax的WebGIS的方案,并将该方案应用于网吧监控系统的开发。实验表明,综合运用Ajax的异步机制以及Ajax与ArcIMS的混合缓存技术实现的WebGIS,较好地实现浏览器与地图服务器之间的异步交互,均衡了服务器和客户端的负载、提高了用户体验,使整个WebGIS的性能达到最佳状态。     

基于ArcIMS的WebGIS应用系统的构建与实现

WebGIS是一种在网页上显示地理信息的先进的GIS应用系统,它解决了传统胖客户端对机器配置要求高、不便于维护、不利于地理信息广泛发布的缺点.文中简要阐述了ArcIMS地图服务器、WebGIS应用系统的工作原理及其配置,并通过基于ArcIMS的WebGIS智能交通系统的开发,介绍了WebGIS应用系统的一种开发方法,对于构建WebGIS应用系统起到了积极的作用.     

基于ArcXML的WebGIS原理及相关技术

论述了基于ArcXML的WebGIS的原理及相关技术,讲述了ArcXML的基本框架和ArcXML在信息请求和信息反馈中的重要作用,并用一个地图配置文件实例简要说明了ArcXML在ArcIMS中的应用。阐述了WebGIS的MVC设计模式,着重分析了符合MVC模式的WebGIS的一个典型解决方案—ArcIMS,剖析了ArcIMS的多层体系结构,分别介绍了ArcIMS的各个功能部件。     

基于构件技术的WebGIS的研究及其EJB实现

本文在分析了WebGIS现存开发方式的缺陷后，介绍了基于构件的WebGIS的概念和它的优点，并以ArcIMS地图服务平台为例，在对地图通用功能进行分析后，结合EJB构件技术给出了一个对外提供WebGIS二次开发服务的通用功能构件层。     

基于ArcIMS校园WebGIS系统的研究

校园WebGIS系统是数字校园系统的重要组成部分。ArcIMS是应用广泛的WebGIS开发平台。以校园WebGIS系统的实现为例,介绍如何使用ArcIMS建立B／S3层架构的WebGIS应用。     

基于ArcIMS的校园WebGIS查询系统研究与开发

本文将ArcIMS技术应用于校园WebGIS查询系统的开发过程,首先从系统的总体目标、总体结构、系统功能和数据库四个方面描述了系统的设计思想与过程,接着为系统的运行配置软硬件环境并完成地图服务的创建、设计和发布,最后利用ArcIMS定制HTML Viewer的瘦客户端模式建立Web站点,由此开发和实现了系统的浏览、编辑及基本地图操作等功能。     

基于ArcIMS的公众查询系统的研究与实现

万维网地理信息系统（WebGIS）技术的成熟发展及广泛应用为满足公众获取地理信息相关服务的需求提供了很好的技术支持。首先简要介绍了WebGIS技术和ArcIMS的基本原理,然后运用JavaScript、ArcXML、JSP等语言开发了基于ArcIMS的公众查询系统。     

基于ArcIMS的速生丰产林测土配方专家系统的建研

介绍了网络地理信息系统(WebGIS)技术及ArcIMS的体系结构,分析基于ArcIMS开发WebGIS应用系统的体系结构以及主要技术,详细设计了基于ArcIMS的速生丰产林测土配方专家系统,确定适宜的造林树种并提供施肥方案,有利于提高林分质量和生产力水平,为提高林农的经营水平提供技术支持。     

基于ArcIMS的速生丰产林测土配方专家系统的建研

介绍了网络地理信息系统（WebGIS）技术及ArcIMS的体系结构,分析基于ArcIMS开发WebGIS应用系统的体系结构以及主要技术,详细设计了基于ArcIMS的速生丰产林测土配方专家系统,确定适宜的造林树种并提供施肥方案,有利于提高林分质量和生产力水平,为提高林农的经营水平提供技术支持。     

Ajax技术与WebGIS

介绍了Ajax技术的基本概念及其关键技术,以ArcIMS为例分析了传统的网络地理信息系统（WebG1S）在数据传输模式和客服交互方式等方面存在的不足,阐述了在WebGIS中使用Aiax技术带来的优势,如减轻服务器的负担、平衡服务器和客户端的负载、无刷新更新页面、减少用户心理和实际的等待时间、实现地图的动态更新、实现地图的可视化交互以及开发效率高等,并指出在WebGIS中使用Ajax技术应该注意的诸如兼容性和用户习惯等问题。Aiax技术的应用将会为传统的WebGIS带来新的生命力。     

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)

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