Results 11 to 20 of about 6,268 (159)

基于粒子群优化极限学习机的断路器故障诊断方法研究

open access: yesGaoya dianqi, 2020
断路器动作时,分合闸线圈电流特征能够反映断路器操动机构或者二次回路的运行状态,文中基于分合闸线圈电流特征值创建了样本库,并提出使用粒子群优化学习机进行故障诊断的方法。该方法首先通过粒子群优化算法寻找最优解,即极限学习机模型中输入层与隐含层间的权值以及隐含层的偏置,然后利用最优值进行极限学习机网络训练,最后使用训练好的网络对测试样本进行诊断并验证该方法的有效性。同时搭建了未优化的极限学习机模型和遗传算法优化的极限学习机模型,仿真结果表明,经过粒子群算法优化后的极限学习机能100 ...
张佳, 陈志英, 陈丽安, 陈庆荣
doaj  

机器学习在脑血管病基因组学数据分析中的应用进展 Application of Machine Learning in Genomic Data Analysis of Cerebrovascular Diseases

open access: yesZhongguo cuzhong zazhi, 2023
随着精准医疗时代的到来,在脑血管病领域,基因组学研究受到越来越多的关注。基因组学数据的高维复杂性,使得机器学习成为分析基因组学数据的最为有效的工具之一。本文对机器学习的基本概念、主要步骤、算法分类以及各算法在脑血管病领域基因组学研究中的应用现状进行介绍,以期为未来脑血管病基因组学研究提供参考。 Abstract: With the advent of the era of precision medicine, genomics research is gradually gaining ...
姜英玉,陈思玎,仇鑫,谷鸿秋
doaj   +1 more source

Artificial Intelligence for Language Learning: A Systematic Review of its Design, Theoretical Foundations, Implementation, and Impact

open access: yesInternational Journal of Applied Linguistics, EarlyView.
ABSTRACT Although the use of AI technologies (e.g., chatbots and automated writing evaluations (AWE)) has gained considerable attention in language learning fields in recent years, how AI technologies have been designed and implemented in language learning education, as well as their effectiveness, is understudied.
Shen Qiao   +2 more
wiley   +1 more source

A machine learning study on gloeobacter violaceus rhodopsin spectral properties(紫色球杆菌视紫红质光谱特性的机器学习研究)

open access: yesZhejiang Daxue xuebao. Lixue ban, 2022
近年来,机器学习等人工智能技术被应用于蛋白质工程,其在蛋白质结构、功能预测、催化活性等研究中具有独特优势。在未知蛋白质结构的情况下,将蛋白质序列和功能特性与机器学习相结合,基于序列-活性关系(innovative sequence-activity relationship,ISAR)算法,将蛋白质氨基酸序列数字化,用快速傅里叶变换(fast four transform,FFT)进行预处理,再进行偏最小二乘回归建模,可在数据集较少情况下拟合得到最佳模型。通过机器学习对紫色球杆菌视紫红质 ...
JIALili(郏丽丽)   +1 more
doaj   +1 more source

Study on Parallel Learning Algorithm of Gradient Boosting Decision Tree [PDF]

open access: yes, 2016
GBDT(GradientBoostingDecisionTree)是一个应用广泛、效果好的监督式机器学习模型。它于2001年由Friedman提出,由决策树(DecisionTree)和梯度提升(GradientBoosting)组合而成。它在实践中被证明是一个很高效的模型,被广泛应用于搜索排序,广告点击率预测等,给工业界带来了巨大的效果提升和收益。随着互联网时代的到来,更多的数据可以被获取到。在机器学习中,更多的数据也意味着更好的效果,所以,用大数据来训练机器学习模型是很有必要的 ...
柯国霖
core  

How Do I Measure up? Social Influence and L2 Motivation in the Algorithmic Age

open access: yesInternational Journal of Applied Linguistics, EarlyView.
ABSTRACT Comparative thinking is a fundamental human drive and a hallmark of contemporary life. For social action, such as the learning and use of additional languages, a target for appraisal (an L2 attribute) is evaluated in relation to a comparison standard (an appraiser's standpoint).
Alastair Henry, Meng Liu
wiley   +1 more source

基于极值搜索的四旋翼无人机姿态跟踪控制

open access: yes智能科学与技术学报, 2023
针对具有不确定性四旋翼无人机姿态跟踪问题,提出了基于极值搜索的鲁棒控制方法。首先,建立四旋翼无人机非线性姿态模型,并考虑模型参数的不确定性,设计鲁棒控制器来确保跟踪误差动态的有界性。然后,将鲁棒控制器与无模型学习算法结合,设计基于学习的控制器,从而自动迭代地调整鲁棒控制器的反馈增益,并在线优化期望性能成本函数。最后,通过MATLAB进行数值仿真,所述控制方法的系统稳态跟踪误差相较于经典鲁棒控制方法降低了0.246,证明了所述方法鲁棒性和优越性。
郭大力, 赵中原, 罗子娟
doaj   +1 more source

基于Scopus的植物表型组学研究进展分析 [PDF]

open access: yes, 2018
Bibliometric analyses are capable of demonstrating the history and the tendency of scientific and technological development. This article aims to use big scientific data to explore the present status of plant phenomics, based on which sound ...
Chen, Rongrong   +7 more
core   +1 more source

A Review on Cracking in Laser Additive Manufacturing of Nickel‐Based Superalloys: Types, Formation Mechanisms, and Suppression Strategies

open access: yesRare Metals, Volume 45, Issue 4, April 2026.
ABSTRACT Nickel‐based superalloys (Ni‐based superalloys) have attracted extensive attention in laser additive manufacturing (LAM) due to their capability to directly fabricate complex and high‐performance structural components. However, the rapid melting and solidification inherent to LAM result in intense thermal cycling, which induces high residual ...
Tianxiang Lin   +9 more
wiley   +1 more source

基于半监督学习的断路器弹簧机构机械特性监测及状态评估技术研究

open access: yesGaoya dianqi, 2022
针对断路器弹簧机构机械特性监测及状态识别系统普遍存在监测类型不全、特征值提取单一、判断标准太过绝对等问题,文中提出了基于小波及半监督学习的多特征分析的断路器弹簧操动机构机械状态识别新方法。通过感知元件对分合闸线圈电流、动触头位移等信号进行采集,采用小波算法对信号进行滤波处理,分析断路器弹簧操动机构的分合闸线圈电流、动触头位移等信号与断路器异常状态之间的对应关系,提取特征值,建立半监督学习多分类网络模型,实现断路器弹簧操动机构故障的机械特性监测及状态识别。实验结果验证了此方法具有较高的诊断正确率 ...
彭跃辉   +3 more
doaj  

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