基于LAMP的高性能Web服务器的架构

文章提出了基于LAMP的高性能Web服务器的架构方案,采用了Apache日志、Webalizer日志分析、Cacti流量监控、入侵检测的方法,架构了一个完善的、稳定的、安全的、低廉的高性能Web服务器,满足了中小型企业的要求。     

基于ARM11的碳氢分析仪的研制

利用微库仑法原理,设计了一种基于S3C6410和WinCE6.0的碳氢分析仪,主要包括信号采集模块、A/D转换模块、上位机系统设计、数据校准等。详细地介绍了碳氢分析仪的软硬件设计方案,实现了对碳氢分析的电解控制、涂膜控制、极性转换、终点控制、电压调节、温度控制等功能。利用嵌入式系统和SQLite数据库,设计了基于WinCE6.0的操作界面,完成了对检测数据的管理,实现了碳氢分析仪的微型化和自动化检测。     

基于.NET的实验预约管理系统的实现

针对高等院校开放性实验管理上的不足,利用Microsoft.NET、SQL Server 2005等软件构建了基于Web的实验预约管理系统.讨论了Web系统体系结构、数据库设计以及程序实现的方法.并利用ASENET、C#,ADO.NET等技术,实现了实验预约、审核、查询和管理等功能.采用了存储过程、XML、命名空间、连接池、数据缓存等技术对系统性能进行了优化,提高了系统的安全性、可靠性和浏览速度.     

关系数据库的数据依赖研究的综述

本文对关系数据库理论中的数据依赖研究的情况作了介绍,重点介绍了函数依赖和多值依赖,同时介绍了层次依赖、交互依赖、连接依赖、子集依赖、传递依赖、样板依赖、蕴涵依赖、代数依赖的定义和有关的重要结论。     

面向瘦客户机的嵌入式操作系统的研究

介绍了瘦客户计算的概念，在研究了瘦客户机操作系统要考虑的问题的基础上，分析了Linux作为瘦客户机操作系统的可行性，并对操作系统的内核、函数库、图形用户接口、中文显示和输入等方面进行了详细的分析，提出了相应的解决方法。     

互联网影响学生的质的研究

文章阐述了教育领域适合作质的研究的原因，分析了山西水利职业技术学院学生形成网络成瘾的原因和类型，从认知、学习、社会、情绪、性格及心理方面阐述了互联网对青少年学生的影响，对教育者提出了一定的要求和启示。     

基于组件的学习管理系统的软件设计

随着网络教育应用的不断深入,学习管理系统在教育领域得到了广泛的应用,然而目前存在着适用面小、共享性差、相互独立、自我封闭、系统间没有通用性和不能有效集成等问题。限制了学习管理系统效能的正常发挥,制约了学习管理系统的开发数量,降低了学习管理系统的开发质量。由于组件具有高可靠性、高复用性、高维护性等特点,因此为学习管理系统的开发提供了一种较好的解决途径。     

人机交互的进展及面临的挑战

叙述了人机交互的最近进展，尤其是我国的一些优秀成果，包括多通道交互、交互模型、虚拟现实和三维交互、可穿戴计算和移动计算、智能空间、标准化；并论述了无所不在计算等对人机交互提出的挑战．最后发表了若干看法。     

基于LabVIEW的低频交流电法仪的设计

介绍了低频交流电法原理,针对现有交流电法仪存在体积庞大、维护和改造不便的问题,提出了一种将LabVIEW应用于低频交流电法勘探的设计方案,详细介绍了仪器硬件、软件的设计,重点分析了LabVIEW软件的实现过程。该电法仪以软件为主,利用LabVIEW强大的数据处理、编程直接、网络共享等优点,减小了仪器的硬件开销,体积小、维护方便,且测试达到了预期的效果,满足了应用需要。     

基于Nginx的高校图书馆反向代理服务器的应用

介绍了利用开源软件Nginx在图书馆建立反向代理服务器,既提高了用户请求响应速度、保护了内网服务器的安全,又实现了校外客户端对图书馆内网服务器的访问。同时对Nginx中负载均衡、反向代理、静态文件服务器、身份认证等功能的关键配置进行了说明。     

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.     

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.     

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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