Oracle 9i 分析在BOSS实施中的应用研究

BOSS是一个日益产品化的庞大的系统工程,在Oracle 9i数据库的COST工作方式下,为确保SQL语句的执行计划的稳定和最优性,这就要求制订一套详细的表和索引的分析计划,并根据BOSS的数据特点和实施时间要求,制订一套切实可行的实施计划,本文根据实际的BOSS项目的实施经验,充分阐述了BOSS割接的各个阶段的分析的使用,给类似BOSS的大型系统的实施提供一个思路和参考.     

Windows平台下补丁管理系统的设计与实现

计算机系统的补丁管理已经成为计算机系统安全的一个重要组成部分.在现有技术下,如何完整、规范地为需要严格与Intemet隔离的内联网计算机用户分发和安装补丁是一个较为突出的问题.文章在微软免费的WSUS(Windows Server Update Services)服务基础上,开发出一套基于Windows平台的内联网补丁管理系统,弥补了WSUS系统的不足,提出了一种解决该问题的方案,并已经在中国人民银行浙江省范围内的分支机构中使用,具有很好的效果.     

虚拟现实及其应用进展

虚拟现实是一种多通道的新型人机交互接口,它提供了具有沉浸感的智能虚拟环境并允许用户和该环境进行交互.计算机技术、交互技术和人工智能等相关技术的快速发展促进了虚拟现实技术的巨大进步,以此为基础的实际应用也得到了很快的发展和提高.描述了虚拟现实的涵义及其本质特征,归纳了适合使用虚拟现实技术的场合,并介绍了虚拟现实技术在教育、医疗、科学可视化和工程制造等方面的最新应用,最后对虚拟现实未来的应用做出了展望.     

高效、高质量的纸质工程图和资料存档方案

一、传统保存方案的缺陷 传统的工程图样和资料的保存归档形式是通过纸质或胶片的形式进行的,很多企业都用专门的仓库保管这些珍贵的技术资料.这些资料的内容相当广泛,包括机械设计、建筑设计、工程设计、测绘及地图等各行业的信息.资料的介质也有不同的分类,包括硫酸纸、纸质蓝图、白图及胶片等.     

Gabor滤波器在基于细节点的指纹识别中的应用

针对指纹图像的特点,建立了一套指纹图像预处理体系,为指纹特征点的提取和比对奠定了良好的基础;文中主要进行了以基于细节点的指纹识别系统的处理流程为线索,设计了适合于这种指纹识别系统的Gabor滤波器,并对Gabor滤波器各参数的设定进行了改进;实验结果表明改进后的Gabor滤波器的处理效果明显优于传统算法.     

低音小王子 奋达V610笔记本音箱

体验感受:经过一段时间的奋达V610笔记本音箱试用,可以说它在近期笔记本音箱产品中算是比较突出的了,声音的质感很好,低频的味道不是那么的干瘪,由于AAS技术的引用,显得比较有弹性,略显活泼,箱体上的小红点点缀出了这款音箱的奥义,活泼不失大气,在1.5英寸的单元上,能在游戏、电影中产生比较不错的临场感,还是比较满意的。     

稳步发展的HP CAE

随着市场需求的不断扩大,世界巨头开始纷纷入住中国.在街头、商场、办公室,越来越多中国制造的名牌映入眼帘.不过,几年前很多厂商都是看中中国低廉的劳动力,采取国外元件,中国组装的方式进行生产.市场永远是最终的引导者,中国人群的消费水平、审美水准在潜移默化地提高,洋品牌不得不开始考虑中国人的生活习惯、东方人的审美思想,中国制造也开始了转变.曾经属于研究院所"专有名词"的CAE开始作为产品设计研发的重要一环,被越来越多的企业所应用,其需求在稳步增长.     

无线局域网下的VoIP监听系统的设计与实现

无线局域网和VoIP技术成熟,为无线IP电话的发展提供了依据.网络电话技术完全不同于传统的通信技术,是新的、纯粹的网络技术的应用.由于IP电话存在先天性方面的缺陷,建立相应的监听系统迫在眉睫.文章指出了建立无线局域网VoIP监听系统的意义和必要性,提出了无线局域网VoIP监听系统的实现方案.该系统实现了信号呼叫,信道控制,语音的编解码处理以及信息和数据流的网络传输.文章详细论述了它们的设计原理和实现机制.     

专访IBM中国研究院院长李实恭博士中西结合达成供应链的最佳平衡

"我们借鉴了中医的一些理论:西医治病要先量血压、测体温,如果是血压高就会开些降压的药.中医的观点则是要调整一个人的健康,帮你达到身体的平衡.IBM SmartSCOR两者兼具,即可以像西医那样帮企业测量出定性的指标,更重要的是能够帮助企业达成供应链上最佳化的乎衡状态."     

一种基于XML的个性化的资源需求描述机制

在基于因特网的教育资源网格体系结构和服务理论研究中,提出了教育资源网格中一种基于XML的个性化文件资源需求描述机制.需求者不仅可以更加准确地表达自己对各类文件资源的需求,还可以指明自己所期望的资源的区域和学校的来源.并且对备选的信息进行优先级的排序,在搜索的过程中按照优先级的顺序对搜索的结果进行优化.解决了资源需求描述机制中对教育资源网格的文件资源需求描述支持较少的问题.     

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