一种新的基于LMP准则的自适应正弦波频率估计算法

自适应IIR陷波器在许多不同的信号处理场合,尤其在估计淹没在噪声中的正弦波频率方面得到广泛应用。本文在研究了多种自适应IIR陷波器算法的基础上,提出了一种基于LMP准则的修正LMP-MNG算法,仿真结果验证了算法的有效性。     

一种基于H．264的有效运动估计算法

运动估计算法是实时视频编解码技术的研究重点，高精度的匹配和补偿可以减少预测误差，提高视频图像的压缩效果．为降低在视频编码标准H．264中运动估计的高计算复杂度问题，提出了采用一种基于节点模型的可变形块匹配运动估计算法来搜索最佳运动矢量．该算法充分利用了H．264运动矢量的的统计特性和相关性，并采用基于像素差值分类的运动估计匹配准则．实验表明，在编码性能损失很小的条件下，该算法有效降低了视频压缩编码中运动估计的运算复杂度．     

基于GB/T22239—2008的网络风险评估模型

依照国家标准GB/T22239-2008采集数据,使得风险评估的数据采集有了可靠依据。基于GB/T22239-2008的网络风险评估模型在评估时采用专家意见和模糊综合评估、云重心判别法相结合的方法,解决了信息安全风险评估过程中定性与定量评估不能很好结合的问题,并给出了应用实例,是一种兼具科学性、综合性和可操作性的综合评估方法。     

Face Feature Selection and Recognition Using Separability Criterion and Binary Particle Swarm Optimization Algorithm

Discrete cosine transform （DCT） is an ef- fective method to extract proper features for face recog- nition. Discrete cosine transform can only map the re- source data to another data field instead of compress data. How to select the DCT coefficients that are most effec- tive for classification is an important problem. This paper proposes a novel method to search the best discriminant combination of DCT coefficients. A feature selection al- gorithm according to the separability criterion is used to preselect the DCT coefficients, and then follows a search algorithm based on binary particle swarm optimization and support vector machine to find an optimal combination of the DCT coefficient. The performance of the algorithm is assessed by computing the recognition rate and the num- ber of selected features on ORL database and Cropped Yale database.     

基于模糊最大散度差判别准则的自适应特征提取模糊聚类算法

指出皋军等人提出的基于模糊最大散度差判别准则(Fuzzy Maximum Scatter Difference Discriminant Criterion,FMSDC)的聚类算法(Fuzzy Maximum Scatter Difference Diseriminant Criterion Based Cluster...     

一种基于最小均方误差准则的多台光电经纬仪测量融合方法

对于用多台光电经纬仪进行交会测量获取空中目标给出了一种定位方法。利用所求目标位置估计点到各个观测站定位视线的距离和最小,先求出两站定位的目标坐标,然后以每两站交会测量方差的倒数为权,将所有的交会测量结果进行融合处理,即可得目标坐标。仿真结果表明,新方法有效地提高了定位的精度及稳定性。     

基于L1-范数的最大间距准则

在进行线性投影降维时,由于传统的最大间距准则(Maximum Margin Criterion,MMC)算法基于L2-范数,易于受到野值(outliers)及噪声的影响.该文提出一种基于L1-范数的最大间距准则(L1-norm-based MMC,MMC-L1)降维方法,它充分利用L1-范数对野值及噪声的强鲁棒性以及最大间距准则,提出了一种快速迭代优化算法,并给出了其单调收敛到局部最优的证明.在多个图像数据库上的实验验证了该方法的鲁棒性与高效性.     

制冷机PID温度控制参数设计

机械制冷机是红外探测器组件的重要组成部分,它为红外探测器提供精确、稳定的低温工作环境。机械制冷机普遍采用PID温度控制算法。工程应用中,PID参数的整定大多依赖于调试者的经验,缺少PID参数设计的理论分析。结合制冷机的控制模型,根据波特图和Nyquist稳定判据,分析了PID控制参数的频域设计方法。仿真结果表明,该方法可靠有效,可为机械制冷机PID温度控制参数的在线整定提供指导。     

一种α稳定分布下的变抽头长度LMP算法

针对无法事先知道滤波器抽头长度,且系统中存在“稳定分布噪声的情况,提出了一种α稳定分布背景下的变抽头长度自适应算法,采用3个并行的滤波器,比较数据段内其平均P阶误差大小,每K点数据段更新一次抽头长度,数据段内滤波器权值采用LMP算法调整。算法仿真表明,算法在不同特征指数的α稳定分布下都具有很强的韧性,能自适应调整到最优抽头长度,达到最优抽头长度的LMP算法的稳态误差。     

Criterions of designing codebooks and a relay selection scheme for a relay network

For a relay network system with amplify and forward protocol, in this paper, analysis of performance is conducted, and an upper bound of pairwise error probability is obtained. Moreover, a scheme of relay selection is analyzed under assumptions that (i) the relays amplify and forward received signals without any signal processing; (ii) the receiver only knows channel state information from the relays to the receiver; and (iii) the transmitter and the relays do not have any channel state information. Based on the upper bound, a criterion of designing codebook is proposed. Surprisingly, this bound shows that increasing the number of relays can hardly improve performance. Furthermore, the error probability is decreasing with a speed of P^?1, no matter how large the relay number is, where P is the total energy. Also, for the relay selection, the optimal selecting way is to select only one relay with the largest channel gain, which is very different from existing schemes. These results are all confirmed by simulations. Copyright © 2015 John Wiley & Sons, Ltd.