Results 31 to 40 of about 18,698 (136)
On-line support vector regression with multiple samples(基于多样本的在线支持向量回归算法)
提出一种针对多样本的在线支持向量回归(SVR)算法,以解决目前SVR在线训练算法每次只能处理1个样本的问题.算法以拉格朗日乘数法和库恩-塔克(KKT)条件为基础,逐步改变样本的系数,并在每次迭代中保持原来的样本满足KKT条件,最终使所有训练样本满足KKT条件.实验表明,该方法可有效更新SVR模型,且计算效率相比于基于单样本的在线回归算法有较大的优势.
CAOKui-kang(曹葵康) +1 more
doaj +1 more source
Read the free Plain Language Summary for this article on the Journal blog. Abstract The nested subset pattern (nestedness) has been widely used to explain species distributions in island and fragmented systems. Mountain sky islands serve as critical natural laboratories for understanding the evolutionary consequences of geographic isolation and climate
Caiwen Zhang +5 more
wiley +1 more source
本文介绍国外悬式绝缘子进行热机性能试验的意义,IEC推荐的试验方法基本内容及其由来,以及IEC试验方法比瑞典原有方法简化的内容及其使用状况,最后提出了尚需解决的问题。
曾明求
doaj
Abstract DNA barcode‐based species identification has become pivotal in biodiversity research. Current barcoding‐based deep learning methods have advantages in species identification but exhibit significant limitations. By using COI barcoding alone, previous studies were unable to fully capture species identification features. Prior methods showed that
Bin Ye +4 more
wiley +1 more source
‘The Heart of the Matter’: Grandparent Childcare in Contemporary Chinese Families
ABSTRACT Grandparent childcare is an international phenomenon, especially within families with children under 3 years old. China is no exception, as shown by a number of quantitative studies. Less clear is our understanding of the actual childcare arrangements involved and how these are negotiated and sustained through the intergenerational ...
Jiatong Ling +2 more
wiley +1 more source
Lessons from an eradication under multiple constraints of an island rat population of record density
Abstract Invasive rats threaten island biodiversity, disrupting ecosystems and endangering native species. Although rat eradication has succeeded on many islands, tropical islands present unique management challenges. Strict regulations and financial constraints on some tropical islands further limit proven eradication methods, complicating rodent ...
Tatiane Micheletti +7 more
wiley +1 more source
灰色聚类是研究灰色系统的一种分析、判断方法 ,对求解多目标优化问题 ,较一般的其它方法更具合理性及实用性。本文通过对灰色系统、灰色聚类方法的研究 ,在斜齿圆柱齿轮传动多目标优化设计问题传统解法的基础上 ,利用灰色聚类 ,求出了该问题的最满意解 ...
李小平, 刘海兰, 芮延年
doaj
在中子能谱的多球谱仪测量中,现有解谱方法依赖于先验信息进行求解,而在某些特殊应用场景中,如在反应堆屏蔽结构深穿透计算方法的验证中,需要测量值独立于理论先验,即解谱过程不依赖先验信息,从而实现对理论方法的验证。因此,本文结合Lanczos双对角化和Tikhonov正则化方法,建立了基于Krylov子空间方法的迭代正则化解谱方法,并应用于241Am-Be中子源能谱的测量实验。相较于应用广泛的GRAVEL算法和ML-EM算法,迭代正则化方法可有效避免“半收敛”,在实测值涨落较大的情况下实现较好的求解。
唐 松乾 +5 more
doaj +1 more source
随着基础理论和硬件计算能力的飞速发展,深度学习技术在众多领域取得了令人瞩目的成绩。作为描述客观物理世界的重要工具,长期以来微分方程是各领域研究人员关心的重点。近年来,深度学习和微分方程的结合逐渐成了研究的热点。由于深度学习能够从大量数据中高效地提取特征,微分方程能够反应客观的物理规律,因此二者的结合可以有效地提升深度学习的泛化性,同时增强深度学习的可解释性。首先,介绍了深度学习求解微分方程的基本问题。其次,介绍了两类深度学习求解微分方程的方法:数据驱动和物理知情方法。然后 ...
卢经纬, 程相, 王飞跃
doaj
The Method of Fundamental Solutions for Advection-diffusion, Burgers’ and Navier-Stokes Equations
在本論文中,採用尤拉-拉格朗日基本解方法分析對流-擴散方程式、柏格斯方程式以及奈維爾-史托克斯方程式。尤拉-拉格朗日基本解方法是由尤拉-拉格朗日法以及基本解方法所組成,因此兼具兩種方法的優點。利用尤拉-拉格朗日法將具有對流項之非線性偏微分方程式轉換成線性偏微分方程式,接著再以基本解方法求解轉換後之線性偏微分方程式。在基本解方法中,將數值解表示為非穩態基本解的累加,因此可以保持無需網格以及數值積分的優點。 在開始時,將尤拉-拉格朗日基本解方法用來分析一維至三維的對流-擴散方程式 ...
Fan, Chia-Ming, 范佳銘
core

