任意N边形重心计算机算法

介绍了求任意 N边形重心的计算机算法 ,定义了任意 N边形三角形“内分割”和三角形“外分割”,给出了任意 N边形分解成 N - 2个“内分割”三角形的条件 :定理 1和定理 2 .     

硬件冗余技术及可靠性评价

介绍了三种硬件冗余技术:并联系统、备用系统和表决系统,并分析了它们的可靠性指标.然后提出计算机控制系统采用的一些冗余措施,最后给出选择冗余技术的可供参考性的原则.     

焊缝激光跟踪实时图像处理方法的研究

对焊缝激光跟踪中实时图像处理方法进行了研究．采用卷积滤波和中值滤波相结合的方法，改进了中值滤波能力和处理速度；采用Robert算子，较好地保留了激光光带的边缘．方法处理效果好，处理速度快，能够满足跟踪系统的实时性要求．     

基于计算机图像处理的板形识别研究

提出了一种基于计算机图像处理的板形识别方法。首先对输入系统的图像进行中值滤波去噪预处理;再 通过Canny算子检测图像的边缘;用Hough变换提取钢板板形特征;最后根据板形特征应用分类决策树实现对钢 板板形的分类。实验表明该方法能有效地识别出钢板的单边浪、双边浪、中间浪和边中浪。     

International Evidence on GFC‐Robust Forecasts for Risk Management under the Basel Accord

A risk management strategy designed to be robust to the global financial crisis (GFC), in the sense of selecting a value‐at‐risk (VaR) forecast that combines the forecasts of different VaR models, was proposed by McAleer and coworkers in 2010. The robust forecast is based on the median of the point VaR forecasts of a set of conditional volatility models. Such a risk management strategy is robust to the GFC in the sense that, while maintaining the same risk management strategy before, during and after a financial crisis, it will lead to comparatively low daily capital charges and violation penalties for the entire period. This paper presents evidence to support the claim that the median point forecast of VaR is generally GFC robust. We investigate the performance of a variety of single and combined VaR forecasts in terms of daily capital requirements and violation penalties under the Basel II Accord, as well as other criteria. In the empirical analysis we choose several major indexes, namely French CAC, German DAX, US Dow Jones, UK FTSE100, Hong Kong Hang Seng, Spanish Ibex 35, Japanese Nikkei, Swiss SMI and US S&P 500. The GARCH, EGARCH, GJR and RiskMetrics models as well as several other strategies, are used in the comparison. Backtesting is performed on each of these indexes using the Basel II Accord regulations for 2008–10 to examine the performance of the median strategy in terms of the number of violations and daily capital charges, among other criteria. The median is shown to be a profitable and safe strategy for risk management, both in calm and turbulent periods, as it provides a reasonable number of violations and daily capital charges. The median also performs well when both total losses and the asymmetric linear tick loss function are considered Copyright © 2012 John Wiley & Sons, Ltd.     

基于零知识证明的匿名投票方案

针对现有电子投票与问卷调查系统中公正性与匿名性这两项最根本需求,提出了运行于以太坊上的智能合约投票方案。方案满足可信、透明的要求,剥离了对可信第三方的依赖。随后进一步结合零知识证明与数字签名技术,实现了方案的匿名性。通过合理设计算术电路及智能合约,该方案可满足一人一票或一人多票的应用场景。通过安全性分析,本方案完全满足业界对电子投票方案公认的各种要求,加之相关代码已完整开源,为后续移植及具体应用提供了借鉴与参考。     

非参数回归的CV NN中位数估计的相合性

考虑非参数回归模型Y_i=g(x_i)+e_i,其中g(x)是待估的连续函数,x_i是非随机的,e_i是i.i.d.随机误差。笔者讨论最近邻中位数估计g_(n,h)(x_i)=m(Y_i(1),…,Y_i(h))=Y_i(1),…,Y_i(h)的中位数,其中h利用平均平方误差意义下的cross-validation方法选择。在一定条件下,建立了cross-validation最近邻中位数估计的相合性。     

一种基于峰谷滤波的改进算法

在峰谷滤波的基础上提出了一种新的改进算法,首先在噪声污染图像的滤波窗口中去除除中心象素外的最大最小灰度值象素,然后利用中心象素与修改后的邻域进行比较以判断其是否为噪声点.理论分析和图像处理仿真实验表明,改进后的滤波器性能得到较大改善,在有效去除噪声的同时能充分保留原图像细节信息.     

微小卫星星务计算机系统模拟部件可靠性设计

为确保星务计算机系统长期在轨工作的稳定性,针对系统中数模转换器等不同模拟部件的特点,给出相应的可靠性设计方案。在模拟输入通道中采用中位值滤波和递推平均滤波的组合算法,来获取尽可能可靠的输入数据,在模拟输出通道中则采用中值表决电路通用模块实现正确的模拟输出。该方案已在原理样机研制中得到验证和完善。仿真和验证结果表明,本方案在兼顾微小卫星对功耗、质量等苛刻要求的同时,能够很好地满足系统的可靠性要求。     

A Secure Anonymous Internet Electronic Voting Scheme Based on the Polynomial

In this paper, we use the polynomial function and Chaum＇s RSA （Rivest, Shamir, Adleman） blind signature scheme to construct a secure anonymous internet electronic voting scheme. In our scheme, each vote does not need to be revealed in the tallying phase. The ballot number of each candidate gets is counted by computing the degrees of two polynomials＇ greatest common divisor. Our scheme does not require a special voting channel and communication can occur entirely over the current internet.