GPU拥有几百GFlops甚至上TFlops的浮点计算能力,将GPU应用于粒子模拟,可有效提高大规模粒子模拟的速度,降低计算成本。本文利用GPU加速三维激光等离子体模拟算法LARED-P,提出了基于CPU+GPU的任务划分、GPU上任务分解、大规模计算核心的...GPU拥有几百GFlops甚至上TFlops的浮点计算能力,将GPU应用于粒子模拟,可有效提高大规模粒子模拟的速度,降低计算成本。本文利用GPU加速三维激光等离子体模拟算法LARED-P,提出了基于CPU+GPU的任务划分、GPU上任务分解、大规模计算核心的分解方法,结合使用了寄存器、纹理内存对算法进行加速。在双精度条件下,移植后的算法在工作频率为1.44GHz的NVIDIA Tesla S1070的单个GPU上获得了相当于主频2.4GHz的Intel(R)Core(TM)2 Quad CPU Q6600单核的6倍加速比。展开更多
AIM:To determine the prevalence of active trachoma and its associated factors among children in Lare District,Southwest Ethiopia,2019.METHODS:A community-based cross-sectional study was conducted.A total of 620 partic...AIM:To determine the prevalence of active trachoma and its associated factors among children in Lare District,Southwest Ethiopia,2019.METHODS:A community-based cross-sectional study was conducted.A total of 620 participants were recruited using a multi-stage sampling technique.A structured questionnaire,torch,and magnifying loupes were used for data collection.The data was entered into epidemiological information and exported to statistical package for social science version 20 for analysis.The bi-variable and multivariable Logistic regression analysis model was fitted to identify factors associated with active trachoma.Odds ratio with a 95%CI was used to show the direction and strength of association between independent and outcome variables.RESULTS:A total of 610 children participated in this study with a response rate of 98.39%.The prevalence of active trachoma was 132(21.60%;95%CI:18.40-24.70).Family size being 6-9(AOR=2.34;95%CI:1.14-5.02),presence of more than two preschool children in a house(AOR=2.04;95%CI:1.12-3.70),open field waste disposal system(AOR=2.62;95%CI:1.00-6.80)and type of latrine being uncovered(AOR=4.12;95%CI:2.00-8.51)were positively associated with active trachoma.On the other side,water consumption being 40-60 liters per day was a protective factor for active trachoma.CONCLUSION:The prevalence of active trachoma is high among children aged 1-9 y in Lare District.Uncovered latrine,open field waste disposal system,family sizes of 6-9,and the presence of more than two preschool children in a house are associated with the occurrence of active trachoma.On the other side,water consumption of 40-60 liters is a protective factor.展开更多
为满足分层掺杂点火内爆靶辐射驱动不对称性全过程物理分析的需求,在激光聚变二维总体程序LARED集成上发展了辐射输运建模下的多介质ALE方法-RTALE(Radiative Transfer Arbitrary-Lagrangian-Eulerian)。为提高多介质ALE方法的健壮性,...为满足分层掺杂点火内爆靶辐射驱动不对称性全过程物理分析的需求,在激光聚变二维总体程序LARED集成上发展了辐射输运建模下的多介质ALE方法-RTALE(Radiative Transfer Arbitrary-Lagrangian-Eulerian)。为提高多介质ALE方法的健壮性,发展了驰豫网格重构算法,该重构算法生成的新网格能自适应流场的变化。数值模拟了激波与气柱相互作用的RM不稳定性实验,模拟的气泡变形程度与试验结果基本一致,其中驰豫网格重构算法中的驰豫因子能够很好地反映流场密度梯度。基于辐射多群输运建模的LARED集成程序能够完整模拟辐射驱动不对称性条件下掺杂点火靶二维内爆过程,克服了传统ALE方法计算不下去和算不好的困难,界面变形程度也符合物理分析。展开更多
文摘GPU拥有几百GFlops甚至上TFlops的浮点计算能力,将GPU应用于粒子模拟,可有效提高大规模粒子模拟的速度,降低计算成本。本文利用GPU加速三维激光等离子体模拟算法LARED-P,提出了基于CPU+GPU的任务划分、GPU上任务分解、大规模计算核心的分解方法,结合使用了寄存器、纹理内存对算法进行加速。在双精度条件下,移植后的算法在工作频率为1.44GHz的NVIDIA Tesla S1070的单个GPU上获得了相当于主频2.4GHz的Intel(R)Core(TM)2 Quad CPU Q6600单核的6倍加速比。
文摘AIM:To determine the prevalence of active trachoma and its associated factors among children in Lare District,Southwest Ethiopia,2019.METHODS:A community-based cross-sectional study was conducted.A total of 620 participants were recruited using a multi-stage sampling technique.A structured questionnaire,torch,and magnifying loupes were used for data collection.The data was entered into epidemiological information and exported to statistical package for social science version 20 for analysis.The bi-variable and multivariable Logistic regression analysis model was fitted to identify factors associated with active trachoma.Odds ratio with a 95%CI was used to show the direction and strength of association between independent and outcome variables.RESULTS:A total of 610 children participated in this study with a response rate of 98.39%.The prevalence of active trachoma was 132(21.60%;95%CI:18.40-24.70).Family size being 6-9(AOR=2.34;95%CI:1.14-5.02),presence of more than two preschool children in a house(AOR=2.04;95%CI:1.12-3.70),open field waste disposal system(AOR=2.62;95%CI:1.00-6.80)and type of latrine being uncovered(AOR=4.12;95%CI:2.00-8.51)were positively associated with active trachoma.On the other side,water consumption being 40-60 liters per day was a protective factor for active trachoma.CONCLUSION:The prevalence of active trachoma is high among children aged 1-9 y in Lare District.Uncovered latrine,open field waste disposal system,family sizes of 6-9,and the presence of more than two preschool children in a house are associated with the occurrence of active trachoma.On the other side,water consumption of 40-60 liters is a protective factor.
文摘为满足分层掺杂点火内爆靶辐射驱动不对称性全过程物理分析的需求,在激光聚变二维总体程序LARED集成上发展了辐射输运建模下的多介质ALE方法-RTALE(Radiative Transfer Arbitrary-Lagrangian-Eulerian)。为提高多介质ALE方法的健壮性,发展了驰豫网格重构算法,该重构算法生成的新网格能自适应流场的变化。数值模拟了激波与气柱相互作用的RM不稳定性实验,模拟的气泡变形程度与试验结果基本一致,其中驰豫网格重构算法中的驰豫因子能够很好地反映流场密度梯度。基于辐射多群输运建模的LARED集成程序能够完整模拟辐射驱动不对称性条件下掺杂点火靶二维内爆过程,克服了传统ALE方法计算不下去和算不好的困难,界面变形程度也符合物理分析。
