64位蛋糕怎么分？——低端CPU进入64bit时代

在Intel 正式出货具备EM64T 技术的64bit Celeron D 两周之后,AMD 做出了正式回应:通知其OEM 客户已经准备为其提供支持×86-64bit 的Sempron 处理器。AMD 发言人透露,联想(Lenovo)将获得首批64bit 的Sempron 处理器。在低端64bit 处理器部署完毕后, Intel 和AMD 在高-中-低三条战线上的64bit 处理器都已经上市,64bit 市场最大规模的战争全面打响。     

高灰度级TFT-LCD显示系统的实现

提出了一种以FPGA为核心控制器的高灰度级TFT-LCD显示系统的设计方案。该系统采用幅值-帧速率控制调制-空间混合灰度调制方法,首先将10 bit的R、G、B信号分割成高8 bit数据和低2 bit数据,低2 bit数据经过空间处理后平均分到4个相邻的8 bit数据上,然后把这8 bit数据继续分割成高6 bit数据和低2 bit数据,其中高6 bit数据用于幅值调制,低2 bit数据用于帧速率控制调制,从而实现1 024个灰度等级显示。试验结果表明,该系统具有良好的显示效果和较高的显示灰度等级。     

一种嵌入于微处理器的8位乘加器的设计

给出了一种嵌入于微处理器,8bit×8bit+20bit并行MAC单元的设计;该设计可完成8bit整数或序数的乘法或乘加运算,具有整数乘加运算的饱和检测和饱和处理功能;设计中采用了一种新型Booth编码方法;对部分积压缩阵列进行了优化,将累加值作为一个部分积参与部分积压缩阵列的累加运算,节省了一级超前进位加法器;压缩阵列采用了一种新型4∶2压缩器,进一步缩短了延时,节省了面积。     

市面最强悍64位CPU完全攻略

对于PC而言，64bit是一个发展方向。对于用户而言，64bit已经成为了目前新装机以及升级的必选产品。32bit时代已经逐渐衰老，还犹豫什么呢？一系列64bit攻势即将开始，让我们一起享受64bit的快感吧。当然，这一切都要先从CPU开始……     

Canon PIXMA MP450喷墨一体机

最大打印分辨率4800dpi×1200dpi打印速度黑白文本13ppm彩色8ppm照片约50秒扫描光学分辨率1200dpi×2400dpi扫描色彩深度灰度16bit/8bit彩色48bit/24bit复印速度黑白文本22cpm彩色17cpm体积443mm×417m m×185m mFEATURES对于小型办公室和个人S O H O来说,打印机和复印机是绝对需要的,而扫描仪用得虽然不多,但没有的话有时候又确实不方便。为用得不太多的功能单独购买一个扫描仪确实不够经济,而且扫描仪、打印机和复印机这三大件也要占去不少办公室空间。于是,一体机这种东西就自然而然地出现了——一台很小巧的设备就能完成以上全部工…     

十亿色的美丽 LCD面板进入10bit时代

8bit、16.7M色、MVA、PVA与IPS都曾是发烧友们津津乐道的,进入2007年,10bit面板出现在人们的视野中,NEC、索尼都相继推出10bit规格的液晶电视产品,大幅度提升了LCD的色彩显示能力,同时也让LCD先天性色彩不佳彻底成为历史,10bit技术让"十亿色的美丽"成为现实!首先,让我们来看看LCD从6bit到10bit的发展历程。     

Office实用小技巧专栏

轻松辨别MX440SE显卡的DDR显存位宽 目前市面上的GeForce4 MX440SE显卡的DDR显存有64bit和128bit两种,性能差别较大,那么该如何区分呢?由于这类显卡的显存大多采用TSOP Ⅱ封装,单颗位宽是16bit,故128bit的显卡应该有8颗,而64bit的只     

Ocer眼中的64bit Celeron D

Intel和AMD的64bit战争已经全面爆发了．进入2005年6月份．Intel率先发难．向市场投放了EM64T的Celeron D系列。在价格方面64bit的Celeron D仅比32bit的Celeron D略高．而大量上市之后．64bit的Celeron D的价格迅速滑落到不高于32bit Celeron D的水平。     

扫描之前先压缩——N-TEK800内置JPEG引擎

上海中晶公司推出了分辨率为2400×1200dpi的N-TEK800,此款扫描仪能够提供42bit的色彩输出,并内建了JPEG压缩引擎,树立了1200dpi扫描的新标准。 N-TEK800采用了10000点像索的CCD,能够实现2400×1200dpi的超高精度扫描。因此扫描35mm幻灯片可以放大至A4以上,能够满足高质量的印前输出要求。此款机器采用的14bit高速模/数转换(ADC)芯片,真正做到了42bit扫描输出,可获取63980亿种颜色。42bit扫描技术保留了更多的色彩及层次信息,使图像暗部和高光区的层次分明。     

显存位宽释疑

很多朋友知道现在流行的nVIDIA系列显卡中,TNT2-M64和MX200-MX400的显存位宽的区别在于64bit和128bit的区别,那么大家怎样来区别呢?有一个朋友告诉我UNIKA新上市的小妖G的显存位宽是64bit的,MX400不装128bit的显存装64bit,还是大名鼎鼎的小妖G,是非常奇怪的！     

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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