Results 71 to 80 of about 609 (143)
Zhejiang Daxue xuebao. Lixue ban, 2015 为简化布尔函数6类反对称变量的检测过程，提出了基于谱系数的检测算法.从逻辑变量反对称的定义出发，在分析反对称逻辑变量Rademacher-Walsh (RW)变换谱系数特性的基础上，提出了基于RW变换检测CN(xi | xj)、CE(xi|xj) 、CS(xi | xj) 、CS(xi | xj )、CS(xj|xi)、CS(xj|xi)6类反对称逻辑变量的算法.应用结果表明，该方法具有易操作和计算机编程简单等优点.
LIXiaohua(厉晓华)
doaj +1 more source
An Algorithm for Text Classification Based on KNN [PDF]
, 2012 knn(k-nEArEST nEIgHbOr)是向量空间模型中最好的文本分类算法之一。但是,当样本集较大以及文本向量维数较多时,knn算法分类的效率和准确率就会大大降低。该文提出了一种提高knn分类效率的改进算法,并且改进了相似度的计算方法,能更准确的判断维数高且样本集大的文本向量。算法在训练过程中计算出各类文本在向量空间中的分布范围,在分类过程中,根据待分类文本向量在样本空间中的分布位置,缩小其k最近邻搜索范围。实验证实改进的算法可以在保持knn分类性能基本不变的情况下,显著提高分类效率。KNN(K ...
余悦蒙, 黄小斌
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The security of chaotic asymmetric encryption and its application design [PDF]
, 2013 自从1976年W.Diffie和M.Hellman首次提出了公钥密码系统，它便成了现代密码学的焦点。传统公钥算法由于量子算法的出现而受到威胁，急需研究新型公钥算法。离散Hopfield神经网络的非线性动力学特性，特别其混沌动力学特性，可视为复杂难解的NP问题。此外，离散Hopfield神经网络是也一种可实现高速并行运算的网络，适合用FPGA或CMOS数字集成电路来直接兑现它的并行运算，以实现实时高速传输，满足现代网络通信的实际要求。本论文针对基于OHNN ...
李国刚
core
Algorithm for mining calendar-based temporal association rules [PDF]
, 2006 以日历格作为框架来研究时序关联规则,提出了一个有效的挖掘算法。在用户指定的日历模式下,首先通过一次扫描产生所有的频繁2项集及相应的1*日历模式,在此基础上产生k*日历模式,并利用聚集性质产生候选K项集及相应的日历模式,最后扫描事务数据库产生所有的频繁项集及其日历模式。实验证明,该算法具有较好的性能。An efficient algorithm for temporal association rules based on calendar patterns was presented.A user ...
崔晓军, 薛永生
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Gaoya dianqi, 2017 分析开关电弧的动态过程对提高电器的使用性能和寿命具有重要意义。文中基于电流与空间磁场分布关系,考虑弧径影响,将有触点低压空气电弧视为具有变弧径叠式电流线组合。根据毕奥萨伐尔定律,求取电弧电流线簇在空间磁场的分布,并利用数学反演方法求取电弧所在通流空间域。考虑反演表达式的复杂性及多未知量问题,将方程组求解转化为目标函数最优化问题。在上述研究基础上,采用遗传算法确定电弧空间位置坐标,并将惩罚函数引入目标函数的优化过程,通过这一约束有效地解决了反演的不适定性 ...
赵宏晨, 刘晓明, 李龙女
doaj
Research on coordinated control of support system of magnetoelectric hybrid suspension belt conveyor [PDF]
A magnetoelectric hybrid suspension belt conveyor is introduced as a novel type of continuous transportation equipment characterized by low resistance and low energy consumption.
Gang XU +4 more
core +1 more source
Comparison of Wind Power Density Calculation Methods Based on Weibull Distribution [PDF]
[Introduction] Wind power density is an important parameter for wind resource assessment, and the accurate calculation of wind power density relies on the accuracy of fitting the wind frequency with the Weibull distribution. It is helpful that reasonable
Hua LI
core +1 more source
New class of frequency-hopping sequences set with optimal average Hamming correlation property [PDF]
, 2012 The average Hamming correlation is an important performance parameter of frequency-hopping sequences.A generalization of Whiteman cyclotomy was proposed and then some properties of the new defined cyclotomy classes were presented.Based on the ...
Hai-hui ZHANG +2 more
core
MVDR beamforming for correlated signal with vector smoothing [PDF]
, 2013 The MVDR beamforming algorithm for correlated signal with smoothing was proposed based on electromagnetic vector sensor array.First,the decorrelation principle of MVDR beamforming with vector smoothing was analyzed,and the output SINR of VS-MVDR ...
Jian-wu TAO, Zhi-yong LIN
core