Results 31 to 40 of about 9,359 (164)

基于ISFLA-SVM的变压器故障诊断

open access: yesGaoya dianqi, 2023
为提高变压器故障诊断的准确性,提出了一种改进混合蛙跳算法优化支持向量机模型参数的变压器故障诊断方法。该方法首先采用均匀随机化与反近似对立相结合的方法对混合蛙跳算法的种群初始化进行改进,提高初始解的质量;其次引入差分变异算子,并将余弦适应性骨架差分进化算法内嵌入混合蛙跳算法的局部搜索算法中,同时利用Levy变异算子代替随机更新操作,提高了局部搜索算法的精度,加快了收敛速度;最后利用改进后的混合蛙跳算法对支持向量机模型参数进行优化,建立故障诊断模型。经典测试函数的仿真结果和实例验证结果表明 ...
段中兴   +4 more
doaj  

支持向量机的一种改进的样本简约方法 [PDF]

open access: yes, 2008
经典的支持向量机(SVM)训练算法的实质是求解一个凸二次规划问题,当训练样本很多时,算法的速度会比较慢,且如果两类样本过分交叉,又会降低支持向量机的泛化能力。为了加快支持向量机的训练速度和改善其泛化能力,文章提出了一种改进的样本简约方法。该方法首先抽取边界样本,然后对边界样本中可能存在的噪音、孤立点进行修剪,由此得出最终的训练样本。实验结果表明,该简约方法不仅节约了训练时间 ...
吴武杰
core  

Predicting Spatial Distributions of Mammalian Predation on Translocated Wild Turkeys in Agriculturally Dominated Landscapes 在以农业为主的景观中哺乳动物对易地放归的野生火鸡捕食的空间分布预测

open access: yesWildlife Letters, Volume 3, Issue 3, Page 91-98, September 2025.
The edge densities of cropland, developed land, and water bodies (panel a) predict the spatial probability of mammalian predation on wild turkeys (panel b) using Mahalanobis distance factor analysis in Quitman County, Mississippi, United States. The three habitat fragmentation variables are represented by three arrows, respectively.
Guiming Wang   +2 more
wiley   +1 more source

基于SVM与合分闸线圈电流参数的高压断路器机械故障诊断

open access: yesGaoya dianqi, 2011
高压断路器故障的早期诊断是有效提高电力系统运行可靠性的重要手段,笔者提出应用高性能的支持向量机(SVM)进行高压断路器的机械故障诊断。支持向量机核函数参数的选择直接影响分类结果的好坏,该诊断方法采用群智能算法PSO确定支持向量机中核函数的最优参数以提升分类器性能,将从高压断路器的机械参数信号中提取的动作特性特征量作为支持向量机训练和识别的样本。试验结果表明,该方法确实达到了较高的故障诊断正确率。
袁金丽   +4 more
doaj  

Research of Biological Macromolecule Sequence Prediction Method Based on Multi-Information Fusion [PDF]

open access: yes, 2016
随着测序技术的发展,生物大分子序列数量快速积累,迫切需要了解序列所蕴含的重要生命信息。近年来,生物大分子序列的结构与功能研究已经成为生物信息学领域研究的热点问题。目前,基于生物大分子序列和机器学习模型的方法是生物信息学领域中预测序列结构和功能的重要研究手段。本文从如何构建有效的序列向量化方法、分类算法、以及高质量数据集角度出发,对生物大分子序列预测的几个具体问题进行了深入研究,包括蛋白质结构类预测、蛋白质折叠模式类预测、细胞因子与受体相互作用预测、细胞穿透肽预测、以及microRNA前体预测 ...
魏乐义
core  

Transcending Multidimensional Poverty Classes in Urban Developing Municipalities

open access: yesPoverty &Public Policy, Volume 17, Issue 2, June 2025.
ABSTRACT The study draws on the multidimensional poverty index to characterize the poverty status of households in the Gauteng City Region, South Africa. In particular, it applies multinomial logit regression and mediation analysis to determine the factors influencing the transition of poor and vulnerable households into the multidimensionally nonpoor ...
Adrino Mazenda   +2 more
wiley   +1 more source

The Research of MiRNA-Disease Correlation Prediction [PDF]

open access: yes, 2016
MiRNA是一类重要的非编码RNA,它在许多的生命活动中扮演着非常重要的角色。经研究证实,miRNA与disease的产生有着密切的联系。本文主要基于生物异构网络和机器学习的方法对miRNA-disease关系进行分析与预测。主要包括以下几个方面的内容: (1)本文详细介绍了当前已提出的miRNA-disease关联预测的主要方法,并且对比了不同方法之间的差异,为生物信息研究人员后续对miRNA-disease关联分析和预测的研究提供参考。现已提出的miRNA-disease关联分析和预测方法 ...
李金金
core  

Social science integration at state and federal fish and wildlife organizations in the United States

open access: yesConservation Biology, Volume 39, Issue 2, April 2025.
Abstract Increasingly, conservation professionals and scholars recognize the need for more holistic integration of social science in fish and wildlife management. This call is often framed around the complexity of 21st century conservation challenges and changing societal values toward fish and wildlife and its management.
Michael R. Quartuch   +7 more
wiley   +1 more source

Design and Implementation of Students’ Comprehensive Evaluation System Based on SSH Framework [PDF]

open access: yes, 2015
随着各高校进一步加强综合素质教育,全面客观评价大学生在校期间的表现显得尤为重要。因此,建立一个方便易用的学生综合评价系统,并提出一种能相对客观准确的进行学生评价的方法以方便奖学金发放等具有十分积极的意义。依据上述相关类教务系统的需求以及数据与服务相分离的原则,采用集成SSH框架的JavaEE技术,构建一种B/S模式的Web应用,能够将需求划分为表现层、业务逻辑层、数据持久层的简明体系结构,方便清晰,可复用、易维护。同时,为了客观评价学生,以广泛收集学生在校期间表现的活动数据为基础 ...
梅琳
core  

The development of the Promoting First Relationships home visiting program and caregivers’ comments about their experiences across four RCT studies

open access: yesInfant Mental Health Journal: Infancy and Early Childhood, Volume 46, Issue 2, Page 181-198, March 2025.
Abstract Promoting First Relationships (PFR) is an evidence‐based home‐visiting program for caregivers and their children from birth to age 5 years. It focuses on caregiver–child interaction, attachment, and relationship quality using video feedback of unedited recordings to elicit reflection and provide positive feedback linked to knowledge ...
Monica Oxford   +7 more
wiley   +1 more source

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