Spatial-temporal

时空
  • 文章类型: Journal Article
    COVID-19大流行是一种新现象,已经在许多方面影响了人们的生活方式,例如恐慌性购买(所谓的“仓鼠购物”),采用家庭办公室,和零售购物的下降。对于运输规划师和运营商,在COVID-19封锁期间,即封锁前,分析POI(兴趣点)在需求模式中的空间因素作用是很有趣的。
    这项研究说明了POI访问率或受欢迎程度数据以及其他公开可用数据的用例,用于分析像COVID-19这样的高度动态和破坏性事件期间的需求模式和空间因素。我们通过使用锁定(治疗)作为虚拟变量,开发回归模型来分析空间和非空间属性与慕尼黑COVID-19锁定之前和期间POI流行程度的相关性,具有主要和相互作用的影响。
    在我们针对慕尼黑的案例研究中,在解释受欢迎程度时,我们发现停止距离和星期几等特征的一致行为。仅在非线性模型中发现停车区域是相关的。锁定与POI类型的相互作用,停止距离,一周中的一天被发现非常重要。由于存在不同的城市特定因素,结果可能无法转移到其他城市。
    我们案例研究的结果提供了限制对POI的影响的证据,并显示了POI类型和停止距离与POI流行度的显着相关性。这些结果表明,由于限制,影响的局部和时间变化,这可能会影响城市如何在未来的破坏性事件中适应不同的需求和由此产生的交通模式。
    UNASSIGNED: The COVID-19 pandemic is a new phenomenon and has affected the population\'s lifestyle in many ways, such as panic buying (the so-called \"hamster shopping\"), adoption of home-office, and decline in retail shopping. For transportation planners and operators, it is interesting to analyze the spatial factors\' role in the demand patterns at a POI (Point of Interest) during the COVID-19 lockdown viz-a-viz before lockdown.
    UNASSIGNED: This study illustrates a use-case of the POI visitation rate or popularity data and other publicly available data to analyze demand patterns and spatial factors during a highly dynamic and disruptive event like COVID-19. We develop regression models to analyze the correlation of the spatial and non-spatial attributes with the POI popularity before and during COVID-19 lockdown in Munich by using lockdown (treatment) as a dummy variable, with main and interaction effects.
    UNASSIGNED: In our case-study for Munich, we find consistent behavior of features like stop distance and day-of-the-week in explaining the popularity. The parking area is found to be correlated only in the non-linear models. Interactions of lockdown with POI type, stop-distance, and day-of-the-week are found to be strongly significant. The results might not be transferable to other cities due to the presence of different city-specific factors.
    UNASSIGNED: The findings from our case-study provide evidence of the impact of the restrictions on POIs and show the significant correlation of POI-type and stop distance with POI popularity. These results suggest local and temporal variability in the impact due to the restrictions, which can impact how cities adapt their transport services to the distinct demand and resulting mobility patterns during future disruptive events.
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  • 文章类型: Journal Article
    阿巴的地形,天气,气候使它容易发生山体滑坡,泥石流,和其他自然灾害,这限制了经济和社会的增长。评估和提高区域复原力对于减轻自然灾害和实现可持续发展至关重要。在本文中,采用熵权法将现有框架与地点抗灾能力(DROP)模型相结合,计算了阿坝2010-2018年多灾害压力下的抗灾能力。然后基于变异系数和探索性空间数据分析(ESDA)分析时空特征。最后,偏最小二乘(PLS)回归用于识别对灾害弹性的关键影响。结果表明:(1)阿坝的抗灾能力在2010年至2018年期间有所增加,但在2013年和2017年由于大规模灾害而有所下降。(2)各阿坝县发展水平存在时空差异。从2010年到2016年,东部和西部的低低(LL)聚集显示出明显的正空间关联和高(HH)聚集。然后空间聚集在2017年后减弱。本文提出整合区域发展,加强发展水平建设,并强调阿坝的灾害管理。
    Aba\'s topography, weather, and climate make it prone to landslides, mudslides, and other natural disasters, which limit economic and social growth. Assessing and improving regional resilience is important to mitigate natural disasters and achieve sustainable development. In this paper, the entropy weight method is used to calculate the resilience of Aba under multi-hazard stress from 2010 to 2018 by combining the existing framework with the disaster resilience of the place (DROP) model. Then spatial-temporal characteristics are analyzed based on the coefficient of variation and exploratory spatial data analysis (ESDA). Finally, partial least squares (PLS) regression is used to identify the key influences on disaster resilience. The results show that (1) the disaster resilience in Aba increased from 2010 to 2018 but dropped in 2013 and 2017 due to large-scale disasters. (2) There are temporal and spatial differences in the level of development in each of the Aba counties. From 2010 to 2016, disaster resilience shows a significant positive spatial association and high-high (HH) aggregation in the east and low-low (LL) aggregation in the west. Then the spatial aggregation weakened after 2017. This paper proposes integrating regional development, strengthening the development level building, and emphasizing disaster management for Aba.
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  • 文章类型: Journal Article
    目的:明确肌萎缩侧索硬化症(ALS)的传播模式具有挑战性,但了解这些对个体预测和临床试验设计有意义.然而,缺乏这方面的系统知识。这项研究的目的是表征ALS中传播模式的时空特征,并评估传播模式与生存之间的关联。
    方法:833名ALS患者的队列,分析了在2018年1月至2019年12月之间诊断并随访至2021年8月。传播模式的空间和时间特征是根据所涉及的功能区域(Bulbar,子宫颈,胸/呼吸和腰部)按时间顺序。在涉及至少三个功能区的患者中鉴定了最终的传播模式。进行Kaplan-Meier分析和Cox回归分析。
    结果:在21.2个月的中位随访期间,在657例患者中确定了19种最终的传播模式(78.9%)。在生存分析中,我们发现呼吸功能区参与得越早,死亡风险越高(时间顺序:第1:危险比[HR],3.35,95%置信区间[CI]1.23-9.15;第二:HR2.45,95%CI1.55-3.87;第三:HR1.94,95%CI1.52-2.49),调整年龄,性别,诊断延迟,修订后的ALS功能评定量表评分,认知障碍和利鲁唑。受累区域间隔时间越短是一个独立的不良预后因素。
    结论:ALS的传播模式各不相同。呼吸区域参与的顺序以及功能区参与之间的间隔时间是预后的预测因子。
    OBJECTIVE: Clarification of propagation patterns in amyotrophic lateral sclerosis (ALS) is challenging, but understanding these has implications for individual prognostication and clinical trial design. However, systematic knowledge in this area is lacking. The aim of this study was to characterize the spatial and temporal features of propagation patterns in ALS, and to evaluate the association between propagation patterns and survival.
    METHODS: A cohort of 833 patients with ALS, diagnosed between January 2018 and December 2019 and followed to August 2021, was analysed. Spatial and temporal features of propagation patterns were determined based on the involved functional regions (bulbar, cervical, thoracic/respiratory and lumbar) in time order. The final propagation pattern was identified in patients with at least three functional regions involved. Kaplan-Meier analysis and Cox regression analysis were performed.
    RESULTS: During a median follow-up of 21.2 months, 19 final propagation patterns were identified in 657 patients (78.9%). In survival analysis, we found that the earlier the respiratory functional region becomes involved, the higher the risk of death (time order: 1st: hazard ratio [HR], 3.35, 95% confidence interval [CI] 1.23-9.15; 2nd: HR 2.45, 95% CI 1.55-3.87; 3rd: HR 1.94, 95% CI 1.52-2.49), adjusting for age, sex, diagnostic delay, revised ALS Functional Rating Scale score, cognitive impairment and riluzole. Shorter interval time between involved regions was an independent adverse prognostic factor.
    CONCLUSIONS: The propagation patterns of ALS are varied. The order in which the respiratory region becomes involved and the interval time between involvement of functional regions are predictors for prognosis.
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  • 文章类型: Journal Article
    目的:这是一项长期的回顾性研究,为了解武威市1995-2016年肝硬化的时空变化趋势,找出高发地区。为制定武威市肝硬化综合防治策略提供理论依据。方法:这里,我们提取了在武威市12家哨点医院接受治疗的肝硬化患者的病历数据。我们使用SAS和Joinpoint回归程序进行数据分析,SaTScan9.4软件,用于聚类区域检测,和ArcGIS10.2软件进行地理分布制图。结果:3308例肝硬化患者(平均年龄,55.34年)纳入本研究,15.9%的人年龄在50-54岁之间。大多数是男性(2716,65.8%),性别比为1.92:1,按职业划分的农民(1369,60.3%)。基本社会医疗保险制度覆盖了1271名患者(63%)的医疗费用。1995-2016年进行的Joinpoint回归分析显示,在2010年,2013年和2016年,标准化肝硬化率[平均年度变化百分比(AAPC)=16.7%(95%CI,10.2-23.5%)]增加了三个连接点。1995年至2010年的年度百分比变化(APC)为11.13%(95%CI:6.5-16.0),2010年至2013年的APC为66.48%(95%CI:16.0-138.9);相反,从2013年到2016年,APC为4.4%(95%CI,-7.5-17.8%).洪沙岗镇平均发病率最高。2010年以后,各乡镇的发病率逐渐上升。结果显示,在每个乡镇,肝硬化发病率有一定的空间聚集性,且是非随机的.武威市75个乡镇有4个肝硬化集群。数据收集自2011年至2016年。结论:1995-2016年武威市肝硬化发病率仍呈逐年上升趋势,但自2013年以来增速放缓。在武威,女性患者的肝硬化标准化率稳步上升,并且比男性患者快。有必要加强诊断,治疗,预防,肝硬化相关疾病的防治措施。空间扫描的结果,基本空间分布,聚合时间,和时间趋势分析是一致的。
    Objectives: This was a long-term retrospective study, aiming to understand the temporal and spatial trend of cirrhosis in Wuwei from 1995 to 2016, explore its spatio-temporal aggregation, and find out the high incidence areas. To provide theoretical basis for the formulation of comprehensive prevention and treatment strategy of cirrhosis in Wuwei. Methods: Herein, we extracted data of cirrhosis patients who were treated in 12 sentinel hospitals in Wuwei from their medical records. We used SAS and Joinpoint Regression Program for data analysis, SaTScan 9.4 software for clustering area detection, and ArcGIS 10.2 software for geographical distribution mapping. Results: Among 3308 patients with liver cirrhosis (average age, 55.34 years) included in this study, 15.9% were aged 50-54 years. The majority were men (2716, 65.8%), with a sex ratio of 1.92:1 and peasants by occupation (1369, 60.3%). The basic social medical insurance system covered the healthcare costs of 1271 patients (63%). A Joinpoint regression analysis done for 1995-2016 revealed an increase in the standardized cirrhosis rate [average annual percent change (AAPC) = 16.7% (95% CI, 10.2-23.5%)] with three joinpoints in 2010, 2013, and 2016. The annual percent change (APC) from 1995 to 2010 was 11.13% (95% CI: 6.5-16.0), and APC from 2010 to 2013 was 66.48% (95% CI:16.0-138.9); conversely, from 2013 to 2016, APC was 4.4% (95% CI, -7.5-17.8%). Hongshagang Town showed the highest average incidence. Each township showed a gradual increase in the incidence after 2010. The results revealed that in each township, liver cirrhosis incidence had some spatial aggregation and was nonrandom. Four liver cirrhosis clusters were noted in 75 townships in Wuwei. Data were gathered from 2011 to 2016. Conclusions: From 1995 to 2016, the incidence of cirrhosis in Wuwei still showed an increasing trend, but the growth rate slowed down since 2013. In Wuwei, the rate of standardization of cirrhosis in female patients increased steadily and faster than in male patients. It is necessary to strengthen the diagnosis, treatment, prevention, and control measures of cirrhosis-related diseases. The results of spatial scanning, basic spatial distribution, aggregation time, and time trend analysis were consistent.
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  • 文章类型: Journal Article
    Weather change such as raining is a crucial factor to cause traffic congestion, especially in metropolises with the limited sewer system infrastructures. Identifying the roads which are sensitive to weather changes, defined as weather-sensitive roads (WSR), can facilitate the infrastructure development. In the literature, little research focused on studying weather factors of developing countries that might have deficient infrastructures. In this research, to fill the gap, the real-world data associating with Jakarta, Indonesia, was studied to identify WSR based on smartphone sensor data, real-time weather information, and road characteristics datasets. A spatial-temporal congestion speed matrix (STC) was proposed to illustrate traffic speed changes over time. Under the proposed STC, a sequential clustering and classification framework was applied to identify the WSR in terms of traffic speed. In this work, the causes of WSR were evaluated based on the variables\' importance of the classification method. The experimental results show that the proposed method can cluster the roads according to the pattern changes in the traffic speed caused by weather change. Based on the results, we found that the distances to shopping malls, mosques, schools, and the roads\' altitude, length, width, and the number of lanes are highly correlated to WSR in Jakarta.
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