Results 31 to 40 of about 13,597 (161)
Extended Dynamic Nelson-Siegel Model with Human Factor and Its Application in Predicting Exchange Rate [PDF]
随着越来越多的发达国家步入人口老龄化社会,学者们愈发关注人口结构与资产价格的关系(如利率和人口结构之间的关系)。依据人口结构变化能够显著影响利率的理论基础,本文从统计模型的角度提出了基于人口因子的动态Nelson-Siegel扩展模型,并对美国、加拿大等几个国家的国债收益率曲线进行建模,比较两模型的样本内拟合的RMSE和MAE及模型在递归预测和滚动预测下的样本外预测能力。与原始动态Nelson-Siegel模型比较,该模型在样本内拟合效果和样本外预测效果均占优于原始模型,且基于人口因子的动态Nelson-
郑桂凤
core
Abstract Exploring heat tolerance and acclimation capacity can provide an effective approach to evaluating species’ sensitivity to extremely high temperatures due to climate warming. Despite some work on amphibian and reptile thermophysiological adaptation, related questions remain. We reviewed the literature to provide a synthesis of worldwide data on
Zijian Sun +8 more
wiley +1 more source
考虑可修的单元产品在出现故障时,由于种种原因,故障不能得到及时维修,形成了一段保障延误时间.于是这一更新过程为:正常工作(直到出现故障)-保障延误-故障维修-正常工作……. 假设工作时间、保障延误时间均服从指数分布,故障维修时间服从对数正态分布,用经典方法和广义p值方法给出了可用度的置信下限.
ZHANGGuo-fen(张帼奋) +1 more
doaj +1 more source
China’s Stock Return Rate Prediction Based on MCMC Method [PDF]
近年来,股票慢慢成为金融市场中主要的理财工具,对股票市场收益率的良好把握有助于人们优化手中的资产配置,因此如何正确预测股票市场的收益率渐渐成为了经济金融研究中的热点问题.为此,一些学者开始试图应用先前的理论将股票收益率与其他变量相联系,通过统计学方法并建立数学模型来寻找股票收益率与其他变量的数量关系,尝试得到股票市场收益率的预测.
刘若佳
core
Survival, rarity, and extinction in tropical stony corals
Abstract Many reef‐building tropical corals are becoming rare. We considered the meaning of rarity in corals and highlighted taxa that have reached low abundances in the last few decades. The difficulties of quantifying rarity in the marine environment arise from the sheer scale and 3‐dimensional nature of the biome and the inherent challenges therein ...
Bryan Wilson, Peter J. Edmunds
wiley +1 more source
在应用敲击法对高压电瓷动态弹性模量测试结果进行修正的基础上,探讨了高压电瓷动态弹性模量的分布。根据动态弹性模量服从复合型威布尔分布的特点提出一个由特定配方的动态弹性模量预测其强度的方法。在均值意义下,还给出了高压电瓷动态弹性模量和强度间的相关关系。应用这个相关关系,它们间的相互推断具有较高的精度。
马功勋
doaj
Study on Influences of Subway Construction on Neighboring Surface and Buildings [PDF]
近年来,我国城市化进程加快,城市地铁建设发展迅猛,为缓解城市交通拥堵发挥了重要作用。然而,地铁大多位于城市繁华地区,地面建筑物林立,施工对周边建筑物所产生影响也表现得越来越突出。本文以厦门市轨道交通1号线工程为背景,在对实测变形监测资料详细分析的基础之上,研究了地铁施工引发周边建筑地基及地表变形的预测方法,总结了地铁施工引发周边建筑地基变形的影响因素与规律,提出了适用于厦门地区地铁施工对周边建筑物影响的控制指标及安全评估方法。主要研究内容及成果如下: (1)根据实测数据统计 ...
张佳
core
Using a diagnostic mitochondrial marker gene, we document the presence of furry‐eared dwarf lemurs, a species known from Madagascar's eastern montane rainforests, in several forest fragments across the island's central highlands. These findings raise new questions about when this species colonized these sites, how they tolerate these changing and ...
Marina B. Blanco +27 more
wiley +1 more source
Research on Real-time Abnormal Detection of Network Traffic under The Big Data Environment [PDF]
随着互联网的快速发展,数据网规模不断扩大,基于数据网的各种应用业务也越来越广泛,对各大运营商以及业务数据量大的企业,在运维管理方面不得不投入了大量的人力与物力。在运维管理中,故障实时预警是最重要的一部分,快速并准确地预警故障,可以以最快的速度发现业务环境中的问题,从而及时地避免故障带来的严重损失。在大数据环境下,研究实时故障预警技术的理论和实现机制,在现实运维管理中有很大的实际意义。 其中流量实时预警是最重要的一个环节,通过流量的实时预警,可以很大程度反馈业务的故障。因此 ...
黄志敏
core
Swamp rabbit (Sulvilagus aquaticus) in southeast Missouri is increasing and expanding, with occupancy probabilities of 0.66 in 2010–2012 and 0.79 in 2021–2022. ABSTRACT Swamp rabbits (Sylvilagus aquaticus) are a bottomland hardwood specialist that have experienced range contraction at the northern and western extents of their range.
Thanchira Suriyamongkol +6 more
wiley +1 more source

