Results 41 to 50 of about 57,925 (177)

Scenarios and strategies for future‐proofing ecosystem management under climatic novelty

open access: yesConservation Biology, EarlyView.
Abstract Climate change is driving unprecedented declines in dominant, habitat‐forming foundation species across marine and terrestrial ecosystems globally. As climatic novelty becomes the norm, ecosystem reassembly will become increasingly common. Predicting and understanding these transitions, and their implications for future ecosystem functioning ...
Lauren T. Toth   +14 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  

Structured machine learning modeling to support conservation of deep‐sea benthic biodiversity

open access: yesConservation Biology, EarlyView.
Abstract Biodiversity monitoring programs need to deliver accurate, timely, and actionable predictions. To establish a predictive monitoring program for deep‐sea benthos of the Santos Basin, Brazil, we developed a two‐stage structured model that allowed comparison of biodiversity predictions obtained from environmental simulations (2M‐Sim).
Gustavo Fonseca   +23 more
wiley   +1 more source

基于大气环境质量及气象参数的绝缘子积污预测研究现状

open access: yesGaoya dianqi, 2017
及时全面掌握电网积污水平是预防电网污闪事故的基础,通过绝缘子积污预测获取污秽水平是适应电网智能化的发展方向,但目前绝缘子积污预测的理论基础不够完善,预测准确性欠缺。文中以上述问题为出发点,对绝缘子积污的外部影响因素进行了分析,对基于大气环境成分、基于气象参数预测绝缘子积污的方法及其准确度、适用性进行了总结。结果表明,大气环境成分、气象参数对绝缘子积污有显著影响;目前基于大气环境成分的绝缘子积污预测尚无法实现饱和污秽度的预测,基于气象参数的绝缘子积污预测尚不能满足工程要求;综合大气环境成分 ...
李特   +5 more
doaj  

热带太平洋海洋叶绿素对SST的影响及其机理分析——基于ROMS的海洋物理-生态模式模拟

open access: yesHaiyang yu huzhao
关于热带太平洋海洋叶绿素对海表面温度(sea surface temperature, SST)年平均场和年际变率的影响,学术界存在着广泛的争议,模拟结果表现出明显的模式依赖性;且对于季节变化上叶绿素如何影响SST的关注较少。为深入研究热带太平洋叶绿素的气候效应,本文基于区域海洋模式系统(Regional Ocean Modeling System, ROMS)构建了海洋物理-生态耦合模式;通过在敏感性试验中设置不同的叶绿素浓度分布,分析了叶绿素对热带太平洋SST的年平均和季节变化的影响。结果表明 ...
张 雯哲   +5 more
doaj   +1 more source

行人轨迹预测方法综述

open access: yes智能科学与技术学报, 2021
随着深度学习技术的突破和大型数据集的提出,行人轨迹预测的准确度已经成为人工智能领域的研究热点之一。主要对行人轨迹预测的技术分类和研究现状进行详细的综述。根据模型建模方式的不同,将现有方法分为基于浅层学习的轨迹预测方法和基于深度学习的轨迹预测方法,分析了每类方法中具有代表性的算法的效果及优缺点,归纳了当前主流的轨迹预测公开数据集,并在数据集中对比了主流轨迹预测方法的性能,最后对轨迹预测技术面临的挑战与发展趋势进行了展望。
李琳辉, 周彬, 任威威, 连静
doaj  

Extended Dynamic Nelson-Siegel Model with Human Factor and Its Application in Predicting Exchange Rate [PDF]

open access: yes, 2016
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  

Evaluating synthetic substitutes to reduce illegal harvesting and support species recovery

open access: yesConservation Biology, EarlyView.
Abstract Providing synthetic substitutes is a widely promoted strategy to shift consumer demand away from wildlife products derived from threatened species. Yet, there is little evidence on whether product substitution prevents illegal or unsustainable harvesting and contributes to the recovery of threatened populations.
Aditya Shekhar Malgaonkar   +17 more
wiley   +1 more source

Study on Procurement Optimization for Third-party Reverse Logistics Service Providers of Electronic Products ——Based on Company X [PDF]

open access: yes, 2016
在现代社会,随着科技不断发展,电子产品越来越普及。面对着越来越大的回收压力和售后维修需求,电子产品制造商开始将逆向物流环节外包,这样既可以保持自己的核心竞争力,也能充分发挥各方优势。这就催生了电子产品第三方逆向物流服务行业,他们专门为电子产品品牌商提供逆向物流服务,包括产品的运输、拆卸、检测、维修、报废等服务。这些企业往往经营管理水平较低,而逆向物流存在着极大的不确定性,再加上电子产品本身的一些特点,如产品周期性、种类多等也加剧了这种不确定性,这给企业的管理带来不小挑战 ...
曾倩岚
core  

Providing regular and frequent maps of losses and gains of farmland birds based on European monitoring data

open access: yesConservation Biology, EarlyView.
Abstract Knowledge of species distributions is essential for informing policies on nature conservation and restoration. However, updating them on a regular basis and doing so in a harmonized manner at the international level is difficult. The European Bird Census Council integrated national monitoring data covering 5 years to update farmland bird ...
Sergi Herrando   +54 more
wiley   +1 more source

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