Forecasting

预测
  • 文章类型: Editorial
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  • 文章类型: Journal Article
    针对电力负荷的高随机性和波动性以及难以准确预测的问题,本文提出了一种基于CEEMDAN(完全集成经验模态分解)和TCN-LSTM(时间卷积网络和长短期记忆网络)的电力负荷预测方法。该方法结合CEEMDAN对原始负荷数据的分解和TCN-LSTM模型的时空建模能力,提高预测的准确性和稳定性。首先,CEEMDAN将原始负荷数据分解为多个线性稳定子序列,然后引入样本熵对每个子序列进行重组。然后将重组后的序列用作TCN-LSTM模型的输入,以提取序列特征并进行训练和预测。通过选择新南威尔士州的电力合规性数据进行建模预测,澳大利亚,并与传统预测方法进行了比较。实验结果表明,本文提出的算法对负荷预测具有较高的精度和较好的预测效果,可为电力负荷预测方法提供部分参考。
    Aiming at the problems of high stochasticity and volatility of power loads as well as the difficulty of accurate load forecasting, this paper proposes a power load forecasting method based on CEEMDAN (Completely Integrated Empirical Modal Decomposition) and TCN-LSTM (Temporal Convolutional Networks and Long-Short-Term Memory Networks). The method combines the decomposition of raw load data by CEEMDAN and the spatio-temporal modeling capability of TCN-LSTM model, aiming to improve the accuracy and stability of forecasting. First, the raw load data are decomposed into multiple linearly stable subsequences by CEEMDAN, and then the sample entropy is introduced to reorganize each subsequence. Then the reorganized sequences are used as inputs to the TCN-LSTM model to extract sequence features and perform training and prediction. The modeling prediction is carried out by selecting the electricity compliance data of New South Wales, Australia, and compared with the traditional prediction methods. The experimental results show that the algorithm proposed in this paper has higher accuracy and better prediction effect on load forecasting, which can provide a partial reference for electricity load forecasting methods.
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  • 文章类型: Journal Article
    滑坡涉及大量岩石的向下运动,碎片,地球,或土壤。当斜坡上的重力和其他类型的剪切应力超过材料的剪切强度时,就会发生滑坡。此外,滑坡可以由削弱边坡材料抗剪强度的过程引发。剪切强度主要取决于两个因素,如摩擦强度,这是斜坡材料的相互作用粒子之间运动的阻力,和凝聚力,这是这些颗粒之间的结合。滑坡是一种可怕的自然灾害,对人类生活和经济都造成了巨大的损害。它通常发生在陡峭的山区或丘陵地区,规模从中型到大型。它进展缓慢(20-50毫米/年),但是当它发生时,它可以以3m/s的速度移动。因此,及早发现或预防这场灾难是一项重要而重要的任务。本文提出了一种收集和分析数据的方法,目的是确定滑坡发生的可能性,以减少其潜在损失。•该方法便于用户掌握滑坡现象信息。•应用机器学习模型预测滑坡现象。•物联网(IoT)系统用于管理并向个体电子邮件地址和移动设备发送警告文本。
    A landslide involves the downward movement of a mass of rock, debris, earth, or soil. Landslides happen when gravitational forces and other types of shear stresses on a slope surpass the shear strength of the materials. Additionally, landslides can be triggered by processes that weaken the shear strength of the slope\'s material. Shear strength primarily depends on two factors such as frictional strength, which is the resistance to movement between the interacting particles of the slope material, and cohesive strength, which is the bonding between those particles. A landslide is a terrible natural disaster that causes much damage to both human life and the economy. It often occurs in steep mountainous areas or hilly regions, ranging in scale from medium to large. It progresses slowly (20-50 mm/year), but when it occurs, it can move at a speed of 3 m/s. Therefore, early detection or prevention of this disaster is an essential and significant task. This paper developed a method to collect and analyze data, with the purpose of determining the possibility of landslide occurrences to reduce its potential losses.•The proposed method is convenient for users to grasp information of landslide phenomenon.•A machine learning model is applied to forecast landslide phenomenon.•Internet of things (IoT) system is utilized to manage and send a warning text to individual email address and mobile devices.
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  • 文章类型: Journal Article
    机器学习方法在地理空间环境问题上的应用越来越多,比如降水临近预报,雾霾预报,和作物产量预测。然而,许多应用于蚊子种群和疾病预测的机器学习方法本身并没有考虑到给定数据的潜在空间结构。在我们的工作中,我们应用由GraphSAGE层组成的空间感知图神经网络模型来预测伊利诺伊州西尼罗河病毒的存在,协助本州内的蚊子监测和消灭工作。更一般地说,我们表明,图神经网络应用于不规则采样的地理空间数据可以超过一系列基线方法的性能,包括逻辑回归,XGBoost,和完全连接的神经网络。
    Machine learning methods have seen increased application to geospatial environmental problems, such as precipitation nowcasting, haze forecasting, and crop yield prediction. However, many of the machine learning methods applied to mosquito population and disease forecasting do not inherently take into account the underlying spatial structure of the given data. In our work, we apply a spatially aware graph neural network model consisting of GraphSAGE layers to forecast the presence of West Nile virus in Illinois, to aid mosquito surveillance and abatement efforts within the state. More generally, we show that graph neural networks applied to irregularly sampled geospatial data can exceed the performance of a range of baseline methods including logistic regression, XGBoost, and fully-connected neural networks.
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  • 文章类型: Journal Article
    背景:登革热(DF)已成为中国重要的公共卫生问题。时空模式和影响其传播的潜在因素,然而,仍然难以捉摸。本研究旨在确定驱动这些变化的因素,并评估中国DF流行的城市风险。
    方法:我们分析了频率,强度,2003年至2022年中国DF病例分布,并评估了11个自然和社会经济因素作为潜在驱动因素。使用随机森林(RF)模型,我们评估了这些因素对当地DF流行的贡献,并预测了相应的城市风险.
    结果:2003年至2022年,本地和输入性DF流行病例数(r=0.41,P<0.01)和受影响城市(r=0.79,P<0.01)之间存在显着相关性。随着输入性疫情发生频率和强度的增加,当地的流行病变得更加严重。它们的发生率从每年5个月增加到8个月,案件数量每月从14到6641。城市级DF流行病的空间分布与Huhuanyong线(Hu线)和秦山淮河线(Q-H线)定义的地理分区一致,并且与蚊媒活动(83.59%)或DF传播(95.74%)的城市级时间窗口非常匹配。当考虑时间窗时,RF模型实现了高性能(AUC=0.92)。重要的是,他们将输入病例确定为主要影响因素,在湖线东部地区(E-H地区)的城市层面上,对当地DF流行的贡献显着(24.82%)。此外,发现进口病例对当地流行病有线性促进作用,而五个气候因素和六个社会经济因素表现出非线性效应(促进或抑制),具有不同的拐点值。此外,该模型在预测中国地方流行病的城市级风险方面表现出出色的准确性(命中率=95.56%)。
    结论:由于输入性DF流行的频率和强度不可避免地较高,中国正在经历零星的局部DF流行的增加。这项研究为卫生当局加强对这种疾病的干预能力提供了有价值的见解。
    BACKGROUND: Dengue fever (DF) has emerged as a significant public health concern in China. The spatiotemporal patterns and underlying influencing its spread, however, remain elusive. This study aims to identify the factors driving these variations and to assess the city-level risk of DF epidemics in China.
    METHODS: We analyzed the frequency, intensity, and distribution of DF cases in China from 2003 to 2022 and evaluated 11 natural and socioeconomic factors as potential drivers. Using the random forest (RF) model, we assessed the contributions of these factors to local DF epidemics and predicted the corresponding city-level risk.
    RESULTS: Between 2003 and 2022, there was a notable correlation between local and imported DF epidemics in case numbers (r = 0.41, P < 0.01) and affected cities (r = 0.79, P < 0.01). With the increase in the frequency and intensity of imported epidemics, local epidemics have become more severe. Their occurrence has increased from five to eight months per year, with case numbers spanning from 14 to 6641 per month. The spatial distribution of city-level DF epidemics aligns with the geographical divisions defined by the Huhuanyong Line (Hu Line) and Qin Mountain-Huai River Line (Q-H Line) and matched well with the city-level time windows for either mosquito vector activity (83.59%) or DF transmission (95.74%). The RF models achieved a high performance (AUC = 0.92) when considering the time windows. Importantly, they identified imported cases as the primary influencing factor, contributing significantly (24.82%) to local DF epidemics at the city level in the eastern region of the Hu Line (E-H region). Moreover, imported cases were found to have a linear promoting impact on local epidemics, while five climatic and six socioeconomic factors exhibited nonlinear effects (promoting or inhibiting) with varying inflection values. Additionally, this model demonstrated outstanding accuracy (hitting ratio = 95.56%) in predicting the city-level risks of local epidemics in China.
    CONCLUSIONS: China is experiencing an increasing occurrence of sporadic local DF epidemics driven by an unavoidably higher frequency and intensity of imported DF epidemics. This research offers valuable insights for health authorities to strengthen their intervention capabilities against this disease.
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  • 文章类型: Journal Article
    目的:研究全球胃癌的历史发病率和死亡率趋势以及到2035年预测的胃癌死亡率。
    方法:发病率数据来自五大洲癌症发病率(CI5)卷I-XI,和死亡率数据来自世界卫生组织(WHO)死亡率数据库的最新更新.我们使用连接点回归分析来检查历史发病率和死亡率趋势,并使用R中的NORDPRED软件包来预测2035年按国家和性别划分的死亡人数和死亡率。
    结果:2020年报告了超过1,089,000例新胃癌病例和769,000例相关死亡。从2003年到2012年,男性人群中胃癌发病率的年均变化百分比(AAPC),韩国,Japan,马耳他,加拿大,塞浦路斯,和瑞士呈增长趋势(P>0.05);女性人口中,加拿大[AAPC,1.2;(95%Cl,0.5-2),P<0.05]呈增加趋势;而韩国,厄瓜多尔,泰国,塞浦路斯呈上升趋势(P>0.05)。AAPC在2006年至2015年男性人群胃癌死亡率中,泰国[3.5(95%cl,1.6-5.4),P<0.05]呈增加趋势;马耳他岛,新西兰,土耳其,瑞士,和塞浦路斯有增加的趋势(P>0.05);在20-44岁的男性人口中,泰国[AAPC,3.4;(95%cl,1.3-5.4),P<0.05;挪威,新西兰,荷兰,斯洛伐克,法国,哥伦比亚,立陶宛,美国呈增加趋势(P>0.05)。据预测,到2035年,斯洛文尼亚和法国的女性死亡率将呈现上升趋势。据预测,以色列男性人口和智利的绝对死亡人数,法国,到2035年,加拿大女性人口将增加。
    结论:在过去的十年中,胃癌的发病率和死亡率呈下降趋势;仍然有一些国家显示出增长的趋势,尤其是在45岁以下的人群中。尽管预计到2035年大多数国家的死亡率将下降,但由于人口增长,胃癌导致的绝对死亡人数可能会进一步增加。
    OBJECTIVE: To study the historical global incidence and mortality trends of gastric cancer and predicted mortality of gastric cancer by 2035.
    METHODS: Incidence data were retrieved from the Cancer Incidence in Five Continents (CI5) volumes I-XI, and mortality data were obtained from the latest update of the World Health Organization (WHO) mortality database. We used join-point regression analysis to examine historical incidence and mortality trends and used the package NORDPRED in R to predict the number of deaths and mortality rates by 2035 by country and sex.
    RESULTS: More than 1,089,000 new cases of gastric cancer and 769,000 related deaths were reported in 2020. The average annual percent change (AAPC) in the incidence of gastric cancer from 2003 to 2012 among the male population, South Korea, Japan, Malta, Canada, Cyprus, and Switzerland showed an increasing trend (P > 0.05); among the female population, Canada [AAPC, 1.2; (95%Cl, 0.5-2), P < 0.05] showed an increasing trend; and South Korea, Ecuador, Thailand, and Cyprus showed an increasing trend (P > 0.05). AAPC in the mortality of gastric cancer from 2006 to 2015 among the male population, Thailand [3.5 (95%cl, 1.6-5.4), P < 0.05] showed an increasing trend; Malta Island, New Zealand, Turkey, Switzerland, and Cyprus had an increasing trend (P > 0.05); among the male population aged 20-44, Thailand [AAPC, 3.4; (95%cl, 1.3-5.4), P < 0.05] showed an increasing trend; Norway, New Zealand, The Netherlands, Slovakia, France, Colombia, Lithuania, and the USA showed an increasing trend (P > 0.05). It is predicted that the mortality rate in Slovenia and France\'s female population will show an increasing trend by 2035. It is predicted that the absolute number of deaths in the Israeli male population and in Chile, France, and Canada female population will increase by 2035.
    CONCLUSIONS: In the past decade, the incidence and mortality of gastric cancer have shown a decreasing trend; however, there are still some countries showing an increasing trend, especially among populations younger than 45 years. Although mortality in most countries is predicted to decline by 2035, the absolute number of deaths due to gastric cancer may further increase due to population growth.
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