浅谈U盘装XP系统

对于一个没有光驱的电脑来讲,一但系统瘫痪了.就是一件比较麻烦的事情.那么用一个小小的U盘重装系统,成了这部分电脑普遍使用的方法.     

Two algorithms for minimum 2-connected r-hop dominating set

For a graph G=(V,E), a subset D⊆V is an r-hop dominating set if every vertex u∈V−D is at most r-hops away from D. It is a 2-connected r-hop dominating set if the subgraph of G induced by D is 2-connected. In this paper, we present two approximation algorithms to compute minimum 2-connected r-hop dominating set. The first one is a greedy algorithm using ear decomposition of 2-connected graphs. This algorithm is applicable to any 2-connected general graph. The second one is a three-phase algorithm which is only applicable to unit disk graphs. For both algorithms, performance ratios are given.     

硬盘数据恢复技术与应用

计算机及网络应用过程中,由于各种原因造成存储数据丢失或损坏经常发生,这会给用户带来很多困扰。因此,研究数据恢复技术是十分必要的。本文简明扼要的对硬盘存储原理、数据恢复实现过程、常用数据恢复软件和技巧做了介绍。     

高端磁盘阵列体系结构分析

本文介绍了两种市场主流高端磁盘阵列的体系结构,阐述了软件对提高存储服务器性能的作用,比较了两种高端磁盘阵列,最后总结了高端磁盘阵列所采用技术并预测未来发展趋势.     

光寻址电位传感器阵列信号处理仿真研究

基于微透镜和频率调制盘的设计,提出了光寻址电位传感器阵列(LAPS)中光脉冲阵列的频率调制方法和基本的测量系统.采用Matlab对LAPS阵列可能检测到的光电流信号进行快速傅立叶变换(FFT)和小波分析的仿真.从仿真得到的频谱图,各频率的脉冲光所对应的光电流能够分辨出来,进一步证明多频率脉冲光源LAPS传感器阵列具有很好的频域分辨率,从而得到LAPS阵列对应各个传感元的信号,为实际LAPS阵列器件的制作和信号处理提供了理论依据.     

计算机硬盘保护系统密码丢失问题及对策研究

硬盘保护系统作为当前保护计算机硬盘的最佳解决办法,能安全有效的保护数据。但是要实现保护硬盘数据的功能,必须通过保护系统密码,进入管理平台操作,使得密码丢失存在较大的可能性。本文分析了硬盘保护系统密码丢失的原因和后果,在技术上提出了重置保护系统密码的解决方案,具有实际意义。     

Multiple robust H∞ controller design using the nonsmooth optimization method

This paper proposes a systematic technique to design multiple robust H_∞ controllers. The proposed technique achieves a desired robust performance objective, which is impossible to achieve with a single robust controller, by dividing the uncertainty set into several subsets and by designing a robust controller to each subset. To achieve this goal with a small number of divisions of the uncertainty set, an optimization problem is formulated. Since the cost function of this optimization problem is not a smooth function, a numerical nonsmooth optimization algorithm is proposed to solve this problem. This method avoids the use of Lyapunov variables, and therefore it leads to a moderate size optimization problem. A numerical example shows that the proposed multiple robust control method can improve the closed‐loop performance when a single robust controller cannot achieve satisfactory performance. Copyright © 2009 John Wiley & Sons, Ltd.     

基于口令锁生成动态组密钥的整盘加密方案

针对整盘加密模式在实际应用中系统较难维护和密钥管理困难的问题,采用基于口令锁的双层密钥获取结构,应用动态组密钥和安全参数的秘密拆分与门限接入等技术,提出一个基于逻辑口令锁生成组密钥的整盘加密方案。该方案可以实现多用户独立接入,且无需保存磁盘密钥。理论分析和实验结果证明其具有较高的安全性,性能优于同类方案。     

Multi-frequency disturbance rejection via blending control technique for hard disk drives

This paper is concerned with the rejection of multiple narrowband disturbances in hard disk drives (HDDs). Inspired by a control blending idea, the multi-frequency disturbance rejection is formulated as a blending control problem. Each disturbance rejection is accomplished by using the H₂ optimal control method. Based on all H₂ optimal controllers, the blending technique is applied to yield a single controller which is capable of achieving rejection of all disturbances. Rejections of two and three disturbances for a 1.8-inch HDD VCM actuator are taken as application examples in the paper. Simulation and experimental results show that the ultimate controller results in a simultaneous attenuation of disturbances with frequencies higher or lower than the closed-loop system bandwidth. Moreover, the method turns out to be able to lift phase and thus prevent phase margin loss when it is used to deal with disturbances near bandwidth.     

面向Lustre文件系统的固态盘存储加速技术研究

磁盘的随机I/O延时制约了存储系统的性能提高,具备高性能随机I/O特性的固态盘(solid state disk,SSD)逐渐成为关注的热点.分析了磁盘、Flash型SSD以及DRAM型SSD三类设备不同的性能特点,讨论了SSD存储加速技术的研究现状,提出了一种面向Lustre文件系统的固态盘存储加速系统架构,介绍和分析了各模块的构成与原理,提出了对象迁移策略.