Wind direction forecasting plays an important role in wind power prediction and air pollution management. Weather quantities such as temperature, precipitation, and wind speed are linear variables in which traditional...Wind direction forecasting plays an important role in wind power prediction and air pollution management. Weather quantities such as temperature, precipitation, and wind speed are linear variables in which traditional model output statistics and bias correction methods are applied. However, wind direction is an angular variable; therefore, such traditional methods are ineffective for its evaluation. This paper proposes an effective bias correction technique for wind direction forecasting of turbine height from numerical weather prediction models, which is based on a circular-circular regression approach. The technique is applied to a 24-h forecast of 65-m wind directions observed at Yangmeishan wind farm, Yunnan Province, China, which consistently yields improvements in forecast performance parameters such as smaller absolute mean error and stronger similarity in wind rose diagram pattern.展开更多
目的:探讨动态对比增强磁共振成像(dynamic contrast-enhanced magnetic resonance imaging,DCE-MRI)定量参数、血清环状RNA-PVT1(circular RNA-PVT1,circPVT1)、环状RNA-DUSP16(circular RNA-DUST16,circDUSP16)水平与胃癌患者病理特...目的:探讨动态对比增强磁共振成像(dynamic contrast-enhanced magnetic resonance imaging,DCE-MRI)定量参数、血清环状RNA-PVT1(circular RNA-PVT1,circPVT1)、环状RNA-DUSP16(circular RNA-DUST16,circDUSP16)水平与胃癌患者病理特征的相关性及临床意义。方法:回顾性选取2022年1月至2024年3月106例镇平县人民医院影像科胃癌患者为恶性组,选取同期同科室106例胃部良性肿瘤患者为良性组。比较组两DCE-MRI定量参数[胃癌容积转移常数(volume transfer constant,K^(trans))、血管外间隙容积比(extravascular gap volume ratio,Ve)、速率常数(rate constant,K_(ep))]、血清circPVT1、circDUSP16水平,和恶性组中DCE-MRI定量参数、血清circPVT1、circDUSP16不同水平患者的临床病理特征。比较不同预后患者临床病理特征、DCE-MRI定量参数、血清circPVT1、circDUSP16水平并分析胃癌患者发生不良预后的影响因素。结果:恶性组K^(trans)、V_(e)、血清circPVT1、circDUSP16水平高于良性组,K_(ep)低于良性组(P<0.05);在病理分期Ⅲ~Ⅳ期、低分化程度、有淋巴结转移例数占比方面相比,K^(trans)、V_(e)、血清circPVT1、circDUSP16高水平患者高于低水平患者,K_(ep)高水平患者低于低水平患者,预后不良患者高于预后良好患者(P<0.05);预后不良患者K^(trans)、V_(e)、血清circPVT1、circDUSP16水平高于预后良好患者,K_(ep)低于预后良好患者(P<0.05);病理分期Ⅲ~Ⅳ期、低分化程度、有淋巴结转移、K^(trans)≥0.19min^(-1)、Ve≥0.45、K_(ep)≥0.47min^(-1)、circPVT1≥4.45、circDUSP16≥1.72均为预后不良的危险因素(P<0.05)。结论:DCE-MRI定量参数、血清circPVT1、circDUSP16水平与胃癌患者临床病理特征、患者预后关系密切,可作为临床预测患者预后的潜在指标。展开更多
基金supported by the Strategic Priority Research Program-Climate Change: Carbon Budget and Related Issues of the Chinese Academy of Sciences (Grant No. XDA05040301)the National Basic Research Program of China (Grant No. 2010CB951804)the National Natural Science Foundation of China (Grant No. 41101045)
文摘Wind direction forecasting plays an important role in wind power prediction and air pollution management. Weather quantities such as temperature, precipitation, and wind speed are linear variables in which traditional model output statistics and bias correction methods are applied. However, wind direction is an angular variable; therefore, such traditional methods are ineffective for its evaluation. This paper proposes an effective bias correction technique for wind direction forecasting of turbine height from numerical weather prediction models, which is based on a circular-circular regression approach. The technique is applied to a 24-h forecast of 65-m wind directions observed at Yangmeishan wind farm, Yunnan Province, China, which consistently yields improvements in forecast performance parameters such as smaller absolute mean error and stronger similarity in wind rose diagram pattern.
文摘目的:探讨动态对比增强磁共振成像(dynamic contrast-enhanced magnetic resonance imaging,DCE-MRI)定量参数、血清环状RNA-PVT1(circular RNA-PVT1,circPVT1)、环状RNA-DUSP16(circular RNA-DUST16,circDUSP16)水平与胃癌患者病理特征的相关性及临床意义。方法:回顾性选取2022年1月至2024年3月106例镇平县人民医院影像科胃癌患者为恶性组,选取同期同科室106例胃部良性肿瘤患者为良性组。比较组两DCE-MRI定量参数[胃癌容积转移常数(volume transfer constant,K^(trans))、血管外间隙容积比(extravascular gap volume ratio,Ve)、速率常数(rate constant,K_(ep))]、血清circPVT1、circDUSP16水平,和恶性组中DCE-MRI定量参数、血清circPVT1、circDUSP16不同水平患者的临床病理特征。比较不同预后患者临床病理特征、DCE-MRI定量参数、血清circPVT1、circDUSP16水平并分析胃癌患者发生不良预后的影响因素。结果:恶性组K^(trans)、V_(e)、血清circPVT1、circDUSP16水平高于良性组,K_(ep)低于良性组(P<0.05);在病理分期Ⅲ~Ⅳ期、低分化程度、有淋巴结转移例数占比方面相比,K^(trans)、V_(e)、血清circPVT1、circDUSP16高水平患者高于低水平患者,K_(ep)高水平患者低于低水平患者,预后不良患者高于预后良好患者(P<0.05);预后不良患者K^(trans)、V_(e)、血清circPVT1、circDUSP16水平高于预后良好患者,K_(ep)低于预后良好患者(P<0.05);病理分期Ⅲ~Ⅳ期、低分化程度、有淋巴结转移、K^(trans)≥0.19min^(-1)、Ve≥0.45、K_(ep)≥0.47min^(-1)、circPVT1≥4.45、circDUSP16≥1.72均为预后不良的危险因素(P<0.05)。结论:DCE-MRI定量参数、血清circPVT1、circDUSP16水平与胃癌患者临床病理特征、患者预后关系密切,可作为临床预测患者预后的潜在指标。
