AGP: ocean model flow visualization

The diversity of flow visualization applications precludes any single solution to all problems and instead requires individual tools for specific purposes. The AGP (Acoustic monitoring of Global ocean climate Program) visualization system handles global-scale ocean models, where the most important goal is to gain an overview and general understanding of flow. Flow visualizations of a Pacific Ocean model for studying global warming have benefited from a “color wheel” technique. The color wheel has proved valuable in this context, and its applicability to hydrodynamic, meteorological and aerodynamic data sets is under investigation     

PCI局部总线与AGP显示接口

本文分析了ＰＣＩ局部总线的特性、设计、操作和最新的ＡＧＰ解决方案。     

具有x|x|非线性的蔡氏电路

研究以x｜x｜非线性函数取代折线非线性v_i特性后的蔡氏电路. 重点讨论非线性函数x｜x｜对于产生混沌振荡的作用, 并用Shil’nikov方法给予严格的证明. 用计算机模拟对电路中发生的分岔过程进行了分析, 并对在实验室实现这种非线性函数的实际蔡氏电路设计作了描述.     

TMS320x24x系列DSP的多机通信及其应用

比较了实现TMS320x24x系列DSP控制器多机通信的三种方式，分别是通过SCI接口、SPI接口和CAN总线来实现。针对实际课题中六相电机控制平台的多机通信问题，提出了一个能同时处理实时信息和非实时信息的新的DSP多机通信解决方案。     

E-methods for fixed point equations f(x)=x

This paper provides newly implemented [11], [13] and widely applicable methods for, computing inclusion (i. e. a containing interval) (Einschließung) of the solution of a fixed point equationf(x)=x as well as autmatic verification the existence (Existenz) and uniqueness (Eindeutigkeit) of the solution. These methods make essential use of a new computer arithmetic defined by semimorphisms as developed in [7] and [8]. We call such methods E-Methods in correspondance to the three German words. A priori estimations such as a bound for a Lipschitz constant etc. are not required by the new algorithm. So the algorithm including the a posteriori proof of existence and uniqueness of the fixed point is programmable on computers for linear as well as for nonlinear problems. This is a key feature of our results. The computations produced by E-methods deliver answers the components of which have accuracy better than 10^?t+1 (wheret denotes the mantissa length employed in the computer).     

关于满足[I(x,y)=I(x,I(x,y))] D-蕴涵的解

研究了[I(x,y)=I(x,I(x,y))]方程,[I]为由连续三角模[T]、连续三角余模[S]和强否定[n]生成的D-蕴涵,即[I(x,y)=S(T(n(x),n(y)),y)],给出了满足方程[I(x,y)=I(x,I(x,y))]的解。     

无线局域网802.11x技术

在这个＂网络就是计算机＂的时代,伴随着有线网络的广泛应用,以快捷高效,组网灵活为优势的无线网络技术正在飞速发展。无线局域网是计算机网络与无线通信技术相结合的产物。本文论述了无线局域网的概念、特点,以及无线局域网的协议标准和安全技术,重点论述了无线局域网的最新协议IEEE802.11n的适用场合及所采用的最新技术MIMO技术。     

遗传算法求f(x)=x·sin(Aπ·x)+B最大值

本实验主要用于求形如f(x)=x·sin(Aπ·x) B的函数在某指定区间中的最大值.由于此函数有多个极值点,一般方法不易找到其最优解,故在本实验中使用GA算法,通过进化寻找其最大值.     

PbZr x Ti 1−x O3 hydrothermal synthesis on titanium substrate for actuators

 This paper reports on a new single hydrothermal process for the deposition of PZT thin films on titanium substrates. The Zr/(Zr+Ti) ratio is adjusted by controlling the Ti and Zr ionic concentrations. The films are analysed by X-ray powder diffraction (XRD), and Scanning Electron Microscopy (SEM). A PZT film of 5 μm thickness (Zr=0.52, Ti=0.48) very interesting from the point of view of piezoelectric constants, was successfully obtained by the control of ions concentration in the solution. The XRD patterns show well-defined peaks corresponding to a well-crystallised PZT phase with the ratio Zr/(Zr+Ti)=0.52. This composition is called the morphotropic-phase boundary (MPB), which means the separation between the tetragonal and rhombohedral phases. SEM micrographs show microcrystalline thin films with homogenous thickness and distribution on the titanium substrate. The microcrystals are cubic. It is demonstrated that large vibration amplitudes can be excited with these films under low voltage supply (5 V). Received: 28 December 1998/Accepted: 4 January 1999     

一个高可移植性的轻量级x86模拟器

介绍一个可以在多种处理器体系结构上运行的轻量级x86模拟器PIT(Portable x86 Instruction Translator)."动态二进制指令翻译"足一个可以让一种机器的指令运行在另一种机器上的技术.PIT采用了可移植的动态二进制指令翻译技术,可以在多种体系结构(包括x86,PowerPC,ARM,Spa...     

RADIUS在802.1x中的应用

在802．1x中使用RADIUS认证,可以为宽带网络提供一种安全的认证、授权、计费方案,而用户的统一认证、上网时限控制和同一账户的多人使用问题并没有被RADIUS本身所解决,使用目录树统一存储用户信息,并通过Schema扩展RadiusSimultaneous和RadiusLoginTime属性以及改进认证流程可以解决上述问题。     

PCI-E x1/PCI转接卡发布

随着PCI插槽利用逐渐减少,用户的PCI接口都处于闲置状态,为了让用户最大利用,外设厂商不断推出各种转接卡。最近日本厂商玄人志向发布了一款PCI转PCI-E xl的转接卡。转接卡型号为"PCIEX1-PCI",搭载了一颗PI7X9X转换控制芯片,Low-Profile规格设计,1Gbps的带     

使用802.1x实现校园网认证

在分析传统的PPPOE和Web/Portal认证方式存在问题的基础上，介绍了使用802．1x协议实现校园网认证这种新的认证方法。     

802.1x在局域网中的应用

由于随着网络建设规模的发展、网络的安全越来越重要,无线网络、局域网等现在面临着巨大的网络安全挑战,这些网络采用对用户认证作为网络安全的一部分,作为用户认证技术之一的802.1x现在使用也越来越广泛,802.1x能够对用户进行认证、授权使不同用户享受不同的权限。     

面向BW104x软流水框架

现代高性能数字信号处理器大多数采用超长指令字体系结构,通过在同一时钟周期发射多条指令以便获得更高的运算性能来发掘目标机器指令级别并行性.介绍了BW104x目标体系特征,BWDSP104X是一款针对高性能计算领域设计的处理器,采用16发射、单指令流,多数据流架构.为了充分利用多簇及簇内硬件资源,基于open64编译基础设施提出了后端软流水优化,其中包括循环选择,资源依赖数据依赖计算,采用经典的模调度方法进行软流水调度,为解决不同迭代变量冲突引入模变量拓展模块.实验结果证明流水后性能相对流水前有了很好的提升.