基于有损连接的个性化隐私保护

数据表的k-匿名化(k-anonymization)是数据发布环境下保护数据隐私的一种重要方法,在此基础上提出的(,)-匿名模型则是有效的个性化隐私保护方法,泛化/隐匿是实现匿名化的传统技术,然而该技术存在效率低,信息损失量大等缺陷。针对上述问题,引入有损连接的思想,提出了基于贪心策略的(,)-匿名聚类算法,该方法通过准标识符属性和敏感属性间的有损连接来保护隐私数据。实验结果表明,与泛化/隐匿方法相比,该方法在信息损失量和时间效率上具有明显的优势,可以获得更好的隐私信息保护。     

基于Virtual PC平台部署Linux疑难问题及解决方案

Linux因其开源的特性及突出的稳定性,使得其在信息业中大行其道,赢得了越来越多的人基于Linux进行学习、应用和开发.Virtual PC是一款好用够用的虚拟机平台软件.但在部署Linux时不可避免地出现如花屏、鼠标键盘不能用、输入乱码等诸多现象.着重探讨并解决这些由于兼容性所导致的各类疑难问题.     

A piecewise variational iteration method for treating a nonlinear oscillator of a mass attached to a stretched elastic wire

In this paper, we introduce a piecewise variational iteration method for treating a nonlinear oscillator of a mass attached to a stretched elastic wire. For the nonlinear oscillator, the present method can produce a good approximation to the exact solution in a very large region, while the standard variational iteration method (VIM) gives a good approximation only in a small region. The numerical results obtained show that the present method does not share the drawback of the standard VIM and can provide very accurate analytical approximate solutions for both small and large values of the oscillation amplitude and parameter.     

Modeling and evaluating information leakage caused by inferences in supply chains

While information sharing can benefit supply chains significantly, it may also have an adverse effect, namely, information leakage. A limitation common to many existing solutions for preventing information leakage in supply chains is that they rely, either implicitly or explicitly, upon two unrealistic assumptions. First, what information is confidential is well known. Second, confidential information will not be revealed, if only it is not shared, regardless of how much other information is being shared. As we shall show in this paper, those assumptions are not always true due to potential information leakage caused by inferences. Specifically, we propose a conceptual model of such information leakage. The model will enable companies in a supply chain to better understand how their confidential information may be leaked through inferences. On the basis of the proposed conceptual model, we then devise a quantitative approach to evaluating the risk of information leakage caused by inferences when a given amount of information is shared. The quantitative approach will allow companies in a supply chain to measure and consequently mitigate the risk of information leakage. Finally, we discuss a case study to illustrate how the proposed approaches work in practice.     

云环境下分布式文件系统负载均衡研究

Hadoop分布式文件系统（Hadoop Distributed File System,HDFS）是一种适合在通用硬件上运行的低成本、高度容错性的分布式文件系统,能提供高吞吐量的数据访问,适合针对大规模数据集上的应用。然而,HDFS中还面临一些性能优化问题,如负载均衡不足。虽然Hadoop系统自带的负载均衡器可以实现均衡调整,但需要用户预先给出静态的阈值。为了解决阈值的固定性和主观性,通过对磁盘空间使用率、CPU利用率、内存利用率、磁盘I/O占用率、网络带宽占用率等参数的分析评估优化,形成对阈值的计算表达式,并通过理论分析和仿真实验对阈值的计算和负载均衡进行验证。实验结果表明,相比较Hadoop静态的输入阈值的算法,该方法达到了更好的平衡效果,提高了计算资源的利用率。     

基于DSP的UAV飞控机智能扩展卡设计

由于无人机需具备体积小、成本低的特点,就要求机载设备集成度高,功能可扩展.无人机飞控计算机是无人机最关键的机载设备,为实现无人机飞控计算机的可扩展性的需要,满足了多种外设接口,文中采用SOC型DSP处理器辅助以双口RAM芯片、串口扩展芯片和DAC转换器完成了一个基于ISA总线接口的高度集成的智能多种外设扩展卡设计;该智能扩展卡具备16路ADC采集端口、6路串口、1路CAN总线和16路DAC输出等,由于该板卡采用双口RAM实现ISA总线接口,可减少主机资源开销并且利于板卡升级为VME或CPCI总线接口;该板卡结构简洁、可靠性高,具备通用性和实用性,并且有利于系统的升级,减轻了主处理器负荷,同样适合其他嵌入式应用场合.     

基于远程桌面连接的现场设备远程控制

传统的远程控制系统,不仅造价高、维护不便,而且远程控制信号的传输距离受传输介质物理特性的限制.为此,利用Windows XP中的远程桌面连接,在A3000过程实验装置上实现了计算机远程控制,构建了新型的、经济实用的远程控制系统,使系统维护更加方便快捷.     

基于ZigBee无线传输技术的电子听诊器

设计一种基于ZigBee无线传输技术的实用电子听诊器,能够采集和处理人体心音数据,并将处理后的数据通过无线传输方式发送出去,接收端通过USB通信接口将数据传输到上位机进行实时显示.该设计运用MEMS麦克风采集心音信号,前置放大和滤波端提供信号放大和滤波等调理功能.无线传输模块采用TI公司的集成无线收发芯片CC2530.     

USING LEAST SQUARE SVM FOR NONLINEAR SYSTEMS MODELING AND CONTROL

Support vector machine is a learning technique based on the structural risk minimization principle, and it is also a class of regression method with good generalization ability. The paper firstly introduces the mathematical model of regression least squares support vector machine (LSSVM), and designs incremental learning algorithms by the calculation formula of block matrix, then uses LSSVM to model nonlinear system, based on which to control nonlinear systems by model predictive method. Simulation experiments indicate that the proposed method provides satisfactory performance, and it achieves superior modeling performance to the conventional method based on neural networks, moreover it achieves well control performance.     

基于Tibco BusinessWorks的Web服务的设计与实现

Web服务技术作为一种全新的分布式技术和网络资源共享技术已被广泛研究和使用,Tibco公司的产品BusinessWorks是用于设计实现Web服务的工具。通过BusinessWorks对Web服务的完整支持,为企业级Web服务应用提供了灵活的系统框架和完整的解决方案。在车险公估系统中,使用BusinessWorks代替传统的Axis开发Web服务,既可以快捷有效地实现配件价格共享功能,又能够提高Web服务的性能。