基于移动agent的J2ME分布式数据库访问*

由于移动手持设备有限的计算和存储能力,J2ME没有提供真正意义上的数据库系统,目前大多数系统采用J2ME－J2EE－数据库系统的解决方案,然而这种线性部署并不适合无线计算环境下频繁断接、高延时等特性。通过借鉴移动agent思想并对其功能进行扩充,提出基于移动agent的J2ME分布式数据库四层C/S访问机制,并在开源Aglets平台基础上开发了一个分布式通讯录系统原型,实验评估显示了方案有效地提高了J2ME设备对分布式数据库访问效率与健壮性。     

基于J2ME平台的无线设备应用系统的开发

J2ME平台是一个具有高可移植性、安全等显著优点的无线设备应用开发平台。介绍了J2ME平台的体系结构、核心概念（如CLDC，MIDP，MIDLet）等，并给出了一个基于J2ME平台开发无线应用系统的实例。     

基于J2ME平台的智能设备2D开发技术

要在智能设备上实现高计算量、高内存消耗的J2ME应用技术难度很大.SUN公司的J2ME平台能对低端智能设备软件开发提供良好的支持.详细论述了利用J2ME进行开发手机游戏所需的技术要点.     

基于J2ME技术的UniJa机制研究与实现

针对嵌入式设备及消费类电器的J2ME技术，首先介绍了基于J2ME技术的UniJa的体系结构及其规范，然后探讨了UniJa平台手机游戏关键技术，最后通过实例给出了三星手机游戏的实现效果。     

基于J2ME技术的嵌入式系统的开发

J2ME技术为无线设备提供了一个安全的、可移植的嵌入式开发平台,可以支持多种设备和多个操作系统的应用环境。本文介绍了J2ME技术的体系结构,功能优点以及开发步骤。并且以“移动QQ”为例,着重讨论了J2ME平台上进行嵌入式开发的重要问题。     

基于NetBeans平台的移动信息设备的J2ME程序开发

介绍了J2ME技术的基本概念和体系结构以及MIDP应用程序的基本架构.通过对J2ME体系结构及MIDP应用程序开发过程进行深入研究,总结出了MIDP应用程序开发的基本流程和方法.同时介绍了J2ME手机移动信息设备应用软件开发平台NetBeans,并通过实例阐述了基于该平台的程序开发,给出基于该技术的手机程序开发的系统设计和关键技术以及运行结果.     

移动信息设备上的J2ME技术

J2ME已经成为开发移动信息设备上应用程序的重要平台.本文首先描述了J2ME的体系结构及其在无线应用领域的优势,并且将J2ME和WAP进行了比较,接着介绍了J2ME的发展现状,最后给出了一些实用的J2ME程序的设计策略.     

基于J2ME的手机游戏开发研究与实现

随着JAVA技术的不断发展，手机等移动设备已经成为新的开发平台，在这些平台上使用J2ME进行游戏开发越来越受到人们的关注。本文介绍了J2ME的体系结构，并结合一个游戏开发实例，详细描述了其开发过程。     

基于J2ME平台的手机实时监视系统的设计

随着3G时代的逐步到来，集办公、娱乐、通讯等多功能于一体的智能化手机已成为各移动设备开发商的开发热点。J2ME（Java 2 Mobile Edition）平台被认为是最杰出的手机程序开发平台，J2ME应用程序可运行在不同制造商的不同设备上，真正体现了Sun公司所倡导的“write once，run anywhere”。讨论了在Windows下的J2ME开发环境下的手机（或PDA等手持移动设备）实时监视系统问题，设计并实现了对远程计算机的实时监视。     

J2ME安全结构研究

J2ME是SUN针对嵌入式设备而开发的新一代JAVA平台，J2ME的安全结构与安全性能成为一个重要的、急需研究的问题，本文首先探讨了J2ME的基本特点与结构，并简要介绍了J2ME的两种配置，CDC和CLDC，然后讨论了JDK的安全结构，着重比较了CDC和CLDC与JDK在安全方面的变化，分析这种变化所造成的CDC和CLDC设备在安全性方面的特点。     

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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