一种基于商用电信网络的容错技术

针对电信级网络的特点,提出了一种双机热备份容错系统实现方案.对双机热备份中的故障检测、故障恢复以及主备用资源一致性等关键问题进行了研究.对于瞬时故障、间歇性故障的容错采用软件冗余方法,而永久性故障则采用硬件冗余方法来解决,使系统可靠性有了进一步的提高.     

浅谈服务器的双机热备份技术

双机热备份技术是目前主流应用的服务器容错技术的一种,具有安装维护简单、稳定可靠、监测直观等优点,满足了当前大多数应用系统的需求,双机热备份有3种模式,主从模式应用较广,双机技术需要依靠双机软件来实现。     

下一代网络核心业务平台的可靠性分析

基于随机Petri网,提出了一种计算NGN核心业务平台可靠性的方法。对双机热备份容错系统和N 1互备份容错系统的硬件环境分别进行了可靠性建模与分析。提出了软件模块容错方法,并得到了该方法的软件模块可靠性表示方法;然后从软件模块的角度,对业务软件的可靠性进行了建模与分析。最后给出了一个实例,分析了NGN核心业务平台的硬件系统和业务软件是如何协作满足业务可靠性要求。     

超短波综合测控系统中控制微机的双机热备份

本文给出超短波综合测控系统中微机系统双机热备份问题的提出、发展近况、双机热备份的技术关键以及一般解决双机热备份的方法。最后给出一种超短波综合测控系统中微机系统双机热备份的实现方法。     

双机容错方案设计

介绍了双机容错的两种基本构架模式，双机互备援模式和双机热备份模式，利用马尔科夫模型对两者的可靠性进行了分析、比较；针对不同的用户给出了相应的双机容错设计方案，并对两种方案的优缺点进行了分析。     

浅析计算机服务器系统的容错技术

计算机容错技术可以提高系统的可靠性、稳定性。本文讲述了容错技术的概念和主要分类,然后对比了两种服务器容错技术：双机热备份和单机容错。最后指出单机容错服务器是未来发展趋势。     

高可用性系统服务器双机热备份技术的研究

主要介绍了高可用性系统服务器双机热备份解决方案,着重阐述了基于在线互连方式的双机热备份技术,提出了双机控制逻辑实现方法,最后给出了实际测试得出的双机切换的功能和性能指标。     

航管雷达任务管理冗余设计与实现

本文研究了双机冗余系统的容错技术和方法,提出了基于热备份冗余模式的双任务管理系统方案,主要内容包括冗余方案的选择,双任务管理系统的硬件设计和软件设计三个方面.     

双机容错方案设计

介绍了双机容错的两种基本构架模式：双机互备援模式和双机热备份模式,利用马尔科夫模型对两者的可靠性进行了分析、比较;针对不同的用户给出了相应的双机窖错设计方案．并对两种方案的优缺点进行了分析。     

主流运营商BRAS双机备份部署方案研究

随着运营商IP承载网络的建设和发展,在网络的骨干层和核心层,已基本实现了网络设备的大容量、多平面、异局址备份部署,备份技术较为全面。在网络的汇聚层,由于单设备承载用户较少,同时通过多链路、多路由的业务接入,备份机制相对完善,但在业务接入控制层时,由于单设备承载用户多,且没有良好备份机制,单点故障容易导致业务中断,用户感知强烈。文中通过对业务接入控制层BRAS双机备份部署方案的研究,围绕目前主流的备份方式,进行双机热备方案优劣对比,对双机备份网络架构改造进行研究,力图为主流运营商进行后续BRAS的双机备份部署提供借鉴和参考。     

一种在二值计算机上实现多值逻辑运算的方法

分析了在二值计算机上实现多值逻辑运算与多值逻辑表示方法的关系，在此基础上，给出一种特殊多值逻辑值的二进制编码，并提出一种在二值计算机上建立起完备的多值逻辑运算集的方法，从而实现了在二值计算机上有效地解决实际多值逻辑问题。     

Method of interpolation factorization (MIF) for the solution oftwo-dimensional diffraction problems

A method for the exact solution of two-dimensional diffraction problems is presented. The method allows the problems to be solved practically in closed form and all the required calculations to be realized using small computers only. Among the most interesting diffraction problems solved by this method are: a thick semi-insulating plate, an infinite periodic corrugated structure, and an echelett     

Distributed Computing Attacks on Cryptographic Systems

It is now possible to link large numbers of desktop computers to achieve massive computing power. This paper briefly describes approaches taken to attack cryptographic algorithms using this method. The approach taken by BT Laboratories in the successful attack on an elliptic curve cipher is detailed. Finally a proposal for the architecture needed to recruit unused computing power for similar problems is given.     

基于物联网的残疾人智能家居的设计与实现

为了提高高位截瘫和上肢双肢残疾人士的生活质量,使他们能够使用电脑,控制电视和空调等家用电器,本文提出了一种基于物联网的智能家居系统的设计方案,实现了常用家电的联网控制,使电脑、电视、空调等常用家电的控制摆脱对人双手的依赖。该智能家居系统使高位截瘫和上肢双肢残疾的人只通过头部的移动就能冲浪上网,控制电视、空调。     

电子束曝光机图形处理系统

本文针对现有电子束曝光机在图形处理过程中存在的一些问题，提出了以辅配微机来增强原机处理能力的方法。对曝光机的图形处理过程及异机通讯等问题作了较详细的介绍。     

Note on the asymptotic approximation of a double integral with an angular-spectrum representation

In this note, we are concerned with the asymptotic approximation of a class of double integrals which can be represented as an angular-spectrum superposition. These double integrals typically appear in electromagnetic scattering problems. Based on the synthetic manipulation of the method of steepest descent path, approximate expressions of the double integrals are derived in terms of the leading term of the contribution to the asymptotic expansions.     

非管理员权限下分发客户端程序的改进方法

介绍了在非管理员权限下分发安装客户端程序的三种已知方法,重点说明带参数运行的域脚本分发方式,并对三种方式做了评价。同时提出了一种创新的改进方法,将域管理员账号密码等信息打包到客户端程序中,解决域分发客户端程序的几种常见问题。     

Eigenvalues for a Centrally Loaded Circular Cylindrical Cavity

The general availability of large high-speed computers has made the use of series expansions in complicated field theory problems feasible even when these series do not converge rapidly. This paper outlines the method and illustrates its application to the solution of a problem in cylindrical coordinates. At the same time, the errors inherent in this method of solution are indicated and estimates are made of their magnitudes. A comparison of the method with Slater's perturbation theory is made.     

A universal matrix solver for integral-equation-based problems

A new method has been developed for compressing the matrices that occur in most integral-equation-based computer programs. This method is easy to interface with existing computer programs, and allows them to run significantly faster and with significantly less memory. This method applies not only to electromagnetic and acoustic computation, but also to most programs involving a Green's function or any integral equation with a kernel having some smoothness properties. Our numerical computations, running on a high-end personal computer, have achieved compression ratios of fifty times, and compressed inversion of the matrices fifty times faster than by previous methods. For larger problems, solved on high-performance computers, these ratios would improve to about one thousand to one for larger moment method problems.     

ICs going on a 3-V diet

The factors motivating the transition, presently underway, from 5-V to 3-V power supplies for integrated circuits are examined. Such a change would favorably impact the size, weight, and battery life of battery-operated equipment, as well as reduce power consumption and alleviate heat problems in workstations and computers. Standardization issues are considered, and the timing of the transition and the problems that will be encountered are discussed