加权均值
加权均值的相关文献在1995年到2020年内共计57篇,主要集中在数学、自动化技术、计算机技术、经济计划与管理
等领域,其中期刊论文56篇、会议论文1篇、专利文献6519篇;相关期刊44种,包括中小企业管理与科技、延边大学学报(自然科学版)、云南师范大学学报(自然科学版)等;
相关会议1种,包括第十一次中国物流学术年会等;加权均值的相关文献由83位作者贡献,包括高丽、张文鹏、李晓爱等。
加权均值
-研究学者
- 高丽
- 张文鹏
- 李晓爱
- 杨新锋
- Ishtiaq Qadri
- Sher Zaman Safi
- Talha Shafi
- Yasir Waheed
- 丁世飞
- 丁争尚
- 丁冠从
- 万海
- 乔京生
- 于莉娜
- 何最红
- 冯强
- 凌云
- 刘万荣
- 刘婷
- 刘宝利
- 刘家财
- 刘平
- 刘晓磊
- 史雪荣
- 吴栩欣
- 咸茂鲜
- 姚海浩
- 孔令富
- 孔维航
- 孙一颗
- 宋国玮
- 尹哲
- 师东生
- 常丹华
- 张天平
- 张彩宏
- 张志洁
- 张辉
- 张道勇
- 惠振阳
- 方江林
- 易媛
- 曹元志
- 朱柱
- 李彩娟
- 李英伟
- 李道军
- 杨剑
- 杨峰明
- 梁喆
-
-
惠振阳;
程朋根;
鲁铁定;
王乐洋;
胡海瑛
-
-
摘要:
在实际应用中常需要将GPS测量得到的大地高转换成正常高,为获得高精度正常高,拟合出高精度的高程异常是非常重要的.传统的求解高程异常方法无法在复杂地形下拟合出高精度高程异常.为解决此问题,提出一种融合加权均值法和多项式曲面拟合法的综合模型方法来求解高程异常.该方法在多项式曲面拟合方法的基础上加上地形改正,使其在高程异常起伏较大的区域同样能达到较高的拟合精度.通过工程实例验证,该综合模型方法相较两种传统的方法在复杂地形环境下能够获得更好的内符合精度和外符合精度.
-
-
梁喆;
郑晶;
欧阳名三;
丁冠从
-
-
摘要:
数字信号在长电缆中传输时,电缆芯线之间会存在串扰,电缆上会存在回波以及噪声干扰,严重的时候传输信号能量和噪声能量在一个数量级上,导致信号传输时的误码率增加.为了降低传输误码率,文中提出了一种新的变步长自适应噪声对消算法,算法迭代的过程中采用误差信号的瞬时能量和输入信号能量的比率作为自适应噪声对消算法的自适应反馈量,并通过比率的加权均值来控制步长的更新,从而消除噪声和回波对算法迭代过程的累积影响.仿真和实验结果表明,在低信噪比的传输环境中,改进算法仍然具有较快的收敛速度和较小的稳态误差,使得数据通信能够保持较高的通信速率.%In the process of digital signal transmission on long cable, there is a crosstalk between different core lines and there are echoes and noise jamming on the cable,in the serious time,the energy of the signal and the noise energy are in an or-der of magnitude,which increase the error rate of signal transmission. In order to reduce the transmission error rate, this paper proposed a new variable step size adaptive noise cancellation algorithm. In the process of iterative algorithm,the ratio of the error signal and the input signal of the instantaneous energy were as the adaptive feedback of the adaptive noise cancellation algorithm, and the weighted mean value of the ratio was used to control the step size update,so as to eliminate the cumulative influence of noise and echo. The simulation and experimental results show that in low SNR environments,the improved algorithm still has fast convergence speed and small steady-state error,so that the data communication can keep high communication rate.
-
-
王枭涵;
王娟娟
-
-
摘要:
Using the analytic methods, the orthogonality of characters and the properties of the classical Gauss sums, the asymptotic problems of the 2m-th power mean of Dirichlet L-functions weighted by the generalized k-th Gauss sums are studied.A sharp asymptotic formula for it is given.%利用解析方法,特征的正交性以及经典高斯和的性质研究Dirichlet L-函数与k次高斯和的加权均值问题,并给出一个较强的渐近公式.
-
-
江巨浪;
章瀚;
朱柱;
詹文法
-
-
摘要:
A kind of image filter for high density salt & pepper noise is presented so as to further improve the PSNR (Peak Signal to Noise Ratio)of output image. Histogram shape is analyzed to decide the two gray values of salt&pepper noises, which are used to detect and locate noise pixels. For each non-noise pixel, its gray level is directly output;for each noisy pixel, the nearest non-noise pixels are searched respectively along k kinds of directions in the neighborhood. Then using reciprocal of Euclidean distance as the weight, the weighted mean of gray levels of these non-noise pixels is used as output. Filter performances with different values of k are tested, which indicates that the optimal value of k is 4. The presented method is used to process images with the salt&pepper noise density from 10%to 90%, and the PSNR values of the output images increase by 1.8 ~ 4.7 dB than other similar methods. This method obviously improves the filtering quality of images with high-density salt&pepper noise, and the processing speed can meet real-time requirements.%提出一种适用于去除高密度椒盐噪声的图像滤波算法,以进一步提高输出图像的峰值信噪比。利用直方图形状判定椒盐噪声的两种灰度值,用于噪声像素的检测与定位。对于非噪声像素,直接输出灰度值;对于噪声像素,沿其邻域的k个方向分别搜索一个距离最近的非噪声像素,然后以欧式距离倒数为权重,采用k个非噪声像素的加权灰度均值作为噪声像素的输出灰度值。测试了不同的方向数k对滤波性能的影响,确定了k的最佳取值为4。采用该方法对椒盐噪声密度为10%到90%的图像进行滤波,输出图像的峰值信噪比比现有同类方法提高了1.8~4.7 dB。该方法有效提高了高密度椒盐噪声图像的滤波质量,处理速度满足实时要求。
-
-
花小朋;
孙一颗;
丁世飞
-
-
摘要:
针对投影孪生支持向量机( PTSVM)在训练阶段欠考虑样本空间局部结构和局部信息的缺陷,提出一种具有一定局部学习能力的有监督分类方法:加权投影孪生支持向量机( weighted PTSVM,WPTSVM)。相比于 PTSVM, WPTSVM优势在于:通过构造类内近邻图为每个样本获取特定的权值,并且以加权均值取代标准均值,在一定程度上提高了算法的局部学习能力;选取异类样本集中少量边界点构造优化问题的约束条件,很大程度上降低了二次规划求解的时间复杂度;继承了PTSVM的优点,可以看成PTSVM的推广算法。理论分析及其在人造数据集和真实数据集上的测试结果表明该方法具有上述优势。%A supervised classification method having a local learning ability, called weighted projection twin support vector machine ( WPTSVM) , is proposed. This method aims to improve upon a defect that projection twin support vector machines ( PTSVMs) have, namely, that PTSVMs do not take account of the local structure and local infor⁃mation of a sample space in the training process. Compared with PTSVM, WPTSVM improves its local learning a⁃bility to some extent by attaching different weights for each sample according to the within⁃class neighborhood graph and replacing the standard mean with a weighted mean. Moreover, to reduce computational complexity, WPTSVM chooses a small number of boundary points in the contrary⁃class based on the between-class neighborhood graph to construct constraints of the original optimization problems. The method inherits the merits of PTSVM and can be re⁃garded as an improved version of PTSVM. Experimental results on artificial and real datasets indicate the effective⁃ness of the WPTSVM method.
-
-
刘婷;
潘广贞;
杨剑;
张彩宏
-
-
摘要:
在使用均值滤波算法修复Stoilov相移算法中出现的奇异点时,会损失相位的细节信息,从而导致计算出的相位存在误差.针对这一问题,提出一种基于短距离优先选择原则的加权均值修正算法.首先,采用统计逼近的原则标记出奇异点;其次,采用短距离优先原则为每个奇异点构造最近邻滤波窗口,窗口的范围依非奇异点个数和当前所能取得的最短距离的情况而定;最后,用窗口中满足要求的非奇异点的加权平均值代替奇异点,实现对奇异点的修正.仿真与实验结果表明,该方法使窗口划分更加细致,能有效去除脉冲噪声,在相位分布细节处理上更具优势,且使得误差均方根低于0.06 cm.
-
-
马元魁;
张天平
-
-
摘要:
利用广义二次 Kloosterman和的上界估计及Dirichlet 特征的正交性等研究了广义二次Kloosterman和模的平方与短区间上特征和模的平方的加权均值估计问题,给出了一个较强的渐近公式。所得结果表明该加权均值具有较好的渐近分布性质,广义二次Kloosterman和与特征和之间的联系得到了刻画。%With the aids of the upper bound of the general quadratic Kloosterman sum and the orthogonal-ity relation for the Dirichlet character ,mean square value on the modulus of the general quadratic Kloost-erman sum weighted by the character sum over a short interval was studied ,and one sharp asymptotic formula was obtained .It showed that the general quadratic Kloosterman sum enjoys good distributive properties .The connection between the general quadratic Kloosterman sum and the character sum was established .
-
-
-
于莉娜;
孔维航;
孔令富;
刘晓磊;
李英伟
-
-
摘要:
提出一种基于油井井下新型多光纤传感器数据融合估计的油气水三相流持气率测量方案.传感器工作于内径为20 mm垂直上升管内.利用多传感器数据融合技术,对采集的原始数据进行预处理,然后基于时间融合的自适应加权对各单光纤传感器进行局部估计,最后基于时间-空间融合的加权平均及递推估计对多光纤传感器进行全局估计,从而提高系统的测量精度和准确性.实验研究表明,该方法使系统测量平均截面持气率误差小于1.0%,降低了系统误差,提高了系统准确性,可为油气田开发动态监测过程提供真实、有效的结果.
-
-
师东生
-
-
摘要:
In the paper we set up a set of system model for the evaluation of user perception in regard to broadband users accessing the Internet. It acquires the feedback results of users perception through QoE-KQI-KPI three-tier system model, calculates the mean of feedback clustering weight of multi-layer system perception, sets weighted average of feedback at every level, and effectively integrates feedback from multilayer different perception results. It assesses the perception quality of the Internet access by broadband users, and provides the basis for operators in network quality control and network optimisation and adjustment. Experiments show that the presented method can effectively fuse the perception results of multilayer users with satisfactory results.%建立一套评估宽带用户互联网访问用户感知的体系模型,通过QOE-KQI-KPI三层体系模型获取用户感知反馈结果,计算多层系统感知反馈聚类加权的均值,设定每个层次反馈的加权平均值,对多层不同感知结果反馈进行有效融合.评估宽带用户上网的感知质量,为运营商进行网络质量监控及网络优化调整提供依据.仿真实验结果表明,提出的方法能有效融合多层用户感知结果,取得了满意的结果.
-
-
刘家财
- 《第十一次中国物流学术年会》
| 2012年
-
摘要:
物流园区作为现代物流业发展到一定阶段的产物,其规划建设正如火如荼的开展.在我国,近年来物流园区数量增长迅猛,并受到政府和业界越来越多的重视.物流园区建设动辄斥资百亿、占地数千亩,是一项投资大、投资回收期长的工程,拥有众多的建筑物及固定机械设备,地址一旦选定,短期内无法更改.因此,物流园区选址的研究显得尤为重要,它犹如一把双刃剑,合理的选址有利于减轻物流对城市交通的压力、减小物流对城市环境的不利影响、提高物流经营的规模效益.如果选址不当,则很容易出现货源不充足、交通设施不完善等影响物流园区运营的状况,不仅无法发挥物流园区的积极作用,反而会浪费大量土地资源和资金,给区域经济、社会环境带来巨大的负面效应.为了最大限度地降低甚至消除物流园区的选址不当给经济及环境造成的不利影响,本文通过对国内外物流园区选址研究现状的分析,提出了利用将定性因素和定量因素综合考虑的直觉模糊数来解决选址问题,建立了基于直觉模糊数加权均值和加权模糊度的物流园区的选址模型,并用算例作为研究成果的验证.结果表明,该方法具有很好的科学性和合理性,能够为决策层提供很好的参考依据.