目的:通过与化脓性颌骨骨髓炎进行对比,总结药物相关性颌骨坏死(medication-related osteonecrosis of the jaw,MRONJ)的影像学及临床特点。方法:回顾性分析MRONJ与化脓性颌骨骨髓炎患者的影像学和临床资料。结果:MRONJ病例中:100%(对...目的:通过与化脓性颌骨骨髓炎进行对比,总结药物相关性颌骨坏死(medication-related osteonecrosis of the jaw,MRONJ)的影像学及临床特点。方法:回顾性分析MRONJ与化脓性颌骨骨髓炎患者的影像学和临床资料。结果:MRONJ病例中:100%(对比化脓性颌骨骨髓炎的14.0%)见骨硬化,30.8%(对比5.0%)见多象限骨硬化,43.6%(对比4.0%)见死骨,25.6%(对比0%)见死骨伴多象限骨硬化;89.7%(对比20.0%)诱因是拔牙。结论:相较于化脓性颌骨骨髓炎,MRONJ观察到骨硬化、多象限骨硬化和死骨影像表现的概率更高,多象限骨硬化伴死骨影像出现时提示其很可能是MRONJ;拔牙是MRONJ的最主要诱因。展开更多
说明词汇学习的重要性。分析初中英语词汇教学现状。阐释元认知和元认知策略。以人教版初中《英语》七年级(上)Unit 5 Do you have a soccer ball? Section A 1a—2d为例,从课前预习,明确词汇学习的重点;课中思考,监控学习过程;课后检测...说明词汇学习的重要性。分析初中英语词汇教学现状。阐释元认知和元认知策略。以人教版初中《英语》七年级(上)Unit 5 Do you have a soccer ball? Section A 1a—2d为例,从课前预习,明确词汇学习的重点;课中思考,监控学习过程;课后检测,评估词汇学习效果三个方面叙述元认知策略的培训过程,将元认知策略与词汇教学特点及过程相结合,探讨预习—计划策略、自我监控策略、自我评估策略在词汇教学中的具体操作。在此基础上,概述元认知策略培训的实际意义。展开更多
目的:探讨以口腔颌面部症状为首发的颌骨转移性腺癌(metastatic adenocarcinoma of the jaw,MAJ)临床及CT影像学特征。方法:收集2006~2020年符合纳入标准的MAJ患者,回顾性分析其临床及CT影像学特点。结果:14例分别源于肺(6例)、肝(4例)...目的:探讨以口腔颌面部症状为首发的颌骨转移性腺癌(metastatic adenocarcinoma of the jaw,MAJ)临床及CT影像学特征。方法:收集2006~2020年符合纳入标准的MAJ患者,回顾性分析其临床及CT影像学特点。结果:14例分别源于肺(6例)、肝(4例)、肾(2例)、前列腺和贲门(各1例)。骨质改变分为5型:溶骨型占5/14,边缘呈浸润型改变;混合型占4/14,边缘大多呈虫蚀状改变;成骨型占1/14,边缘呈硬化型改变;类囊型及牙槽骨吸收型分别占3/14、1/14,边缘均呈地图型改变。结论:MAJ多见于中老年男性的下颌骨后部。首次将其在传统分类基础上,新增类囊型及牙槽骨吸收型。MAJ以进展迅速的溶骨型骨质破坏伴骨膜反应及局限性软组织肿块,且颌骨无明显膨隆及颏部麻木综合征为特征,为临床诊断提供重要依据。展开更多
Low earth orbit(LEO)mega-constellations can provide global low-latency high bandwidth coverage compared to the terrestrial network.The time-varying topology of satellite networks and the uneven traffic distribution le...Low earth orbit(LEO)mega-constellations can provide global low-latency high bandwidth coverage compared to the terrestrial network.The time-varying topology of satellite networks and the uneven traffic distribution lead to the mismatch between satellites and users,resulting in the waste of satellite resources and the degradation of user performance.Through negotiation with neighbors,the traditional terrestrial cell breathing continuously converges to the optimal cell size in the face of user tides,but this method is difficult to converge timely when facing rapid and extreme flow changes caused by the rapid movement of satellites.This paper presents a fast adaptive cell breathing scheme(Fa B)through sub-block division and satellite cell initialization and adjustment.Fa B divides the ground into sub-blocks according to the user density.When the satellite moves in the same sub-block,the step size of breathing is adjusted according to the cell size difference between the previous satellite and the current satellite.When the satellite switches between different sub-blocks,the initial value of the cell is determined according to the density of the new sub-block.In addition to negotiating with neighboring satellites,this scheme also introduces location information to directly adjust the parameters of cell breathing and decrease the time of cell breathing convergence.From the real constellation data-driven simulation,we conclude that Fa B can quickly adjust the size of the cell with the location changing,and the utilization rate is increased by 2.66 times compared to the method with no cell breathing,and by2.37 times compared to the method with cell breathing without location information.展开更多
文摘目的:通过与化脓性颌骨骨髓炎进行对比,总结药物相关性颌骨坏死(medication-related osteonecrosis of the jaw,MRONJ)的影像学及临床特点。方法:回顾性分析MRONJ与化脓性颌骨骨髓炎患者的影像学和临床资料。结果:MRONJ病例中:100%(对比化脓性颌骨骨髓炎的14.0%)见骨硬化,30.8%(对比5.0%)见多象限骨硬化,43.6%(对比4.0%)见死骨,25.6%(对比0%)见死骨伴多象限骨硬化;89.7%(对比20.0%)诱因是拔牙。结论:相较于化脓性颌骨骨髓炎,MRONJ观察到骨硬化、多象限骨硬化和死骨影像表现的概率更高,多象限骨硬化伴死骨影像出现时提示其很可能是MRONJ;拔牙是MRONJ的最主要诱因。
文摘说明词汇学习的重要性。分析初中英语词汇教学现状。阐释元认知和元认知策略。以人教版初中《英语》七年级(上)Unit 5 Do you have a soccer ball? Section A 1a—2d为例,从课前预习,明确词汇学习的重点;课中思考,监控学习过程;课后检测,评估词汇学习效果三个方面叙述元认知策略的培训过程,将元认知策略与词汇教学特点及过程相结合,探讨预习—计划策略、自我监控策略、自我评估策略在词汇教学中的具体操作。在此基础上,概述元认知策略培训的实际意义。
文摘目的:探讨以口腔颌面部症状为首发的颌骨转移性腺癌(metastatic adenocarcinoma of the jaw,MAJ)临床及CT影像学特征。方法:收集2006~2020年符合纳入标准的MAJ患者,回顾性分析其临床及CT影像学特点。结果:14例分别源于肺(6例)、肝(4例)、肾(2例)、前列腺和贲门(各1例)。骨质改变分为5型:溶骨型占5/14,边缘呈浸润型改变;混合型占4/14,边缘大多呈虫蚀状改变;成骨型占1/14,边缘呈硬化型改变;类囊型及牙槽骨吸收型分别占3/14、1/14,边缘均呈地图型改变。结论:MAJ多见于中老年男性的下颌骨后部。首次将其在传统分类基础上,新增类囊型及牙槽骨吸收型。MAJ以进展迅速的溶骨型骨质破坏伴骨膜反应及局限性软组织肿块,且颌骨无明显膨隆及颏部麻木综合征为特征,为临床诊断提供重要依据。
基金the National Key Research and Development Plan of China(No.2018YFB1800301)the National Natural Science Foundation of China(No.62132009)+1 种基金the Youth Fund of National Natural Science Foundation of China(No.61902214)the Tsinghua University-China Mobile Communications Group Co.,Ltd.Joint Institute。
文摘Low earth orbit(LEO)mega-constellations can provide global low-latency high bandwidth coverage compared to the terrestrial network.The time-varying topology of satellite networks and the uneven traffic distribution lead to the mismatch between satellites and users,resulting in the waste of satellite resources and the degradation of user performance.Through negotiation with neighbors,the traditional terrestrial cell breathing continuously converges to the optimal cell size in the face of user tides,but this method is difficult to converge timely when facing rapid and extreme flow changes caused by the rapid movement of satellites.This paper presents a fast adaptive cell breathing scheme(Fa B)through sub-block division and satellite cell initialization and adjustment.Fa B divides the ground into sub-blocks according to the user density.When the satellite moves in the same sub-block,the step size of breathing is adjusted according to the cell size difference between the previous satellite and the current satellite.When the satellite switches between different sub-blocks,the initial value of the cell is determined according to the density of the new sub-block.In addition to negotiating with neighboring satellites,this scheme also introduces location information to directly adjust the parameters of cell breathing and decrease the time of cell breathing convergence.From the real constellation data-driven simulation,we conclude that Fa B can quickly adjust the size of the cell with the location changing,and the utilization rate is increased by 2.66 times compared to the method with no cell breathing,and by2.37 times compared to the method with cell breathing without location information.
