The first mid-term election of the U. S. in the new century took place on November 5, 2002. One third of the senators from the 107th Congress (34 out of 100), all representatives (435), 36 state governors, and numerou...The first mid-term election of the U. S. in the new century took place on November 5, 2002. One third of the senators from the 107th Congress (34 out of 100), all representatives (435), 36 state governors, and numerous local officials and legislators were to be elected or reelected. The resounding victory of the GOP in the congressional elections and the fact that the Democrats only got three more.展开更多
Objective Transesophageal echocardiography (TEE) guided,minimally invasive perventricular device occlusion of ventricular septal defects (VSDs) without cardiopulmonary bypass (CPB) has been applied in multiple centers...Objective Transesophageal echocardiography (TEE) guided,minimally invasive perventricular device occlusion of ventricular septal defects (VSDs) without cardiopulmonary bypass (CPB) has been applied in multiple centers. We reported experiences and the mid-term results. Methods Four hundred and thirty-two cases from 4 cardiac centers were involved in the study. There were 235 maled and 197 females,aged from 3 months to 15 years,with a body weight varying from 4.0 to 26.0 kg.展开更多
Objective To compare the clinical outcomes of Bryan disc replacement with anterior cervical discectomy and fusion (ACDF) in patients with cervical spondylopathy. Methods Sixteen patients underwent Bryan cervicaldisc r...Objective To compare the clinical outcomes of Bryan disc replacement with anterior cervical discectomy and fusion (ACDF) in patients with cervical spondylopathy. Methods Sixteen patients underwent Bryan cervicaldisc replacement (A group) ,and展开更多
为了保障城市电网规划质量和做好电力电量平衡,准确的中长期电力负荷预测变得尤为重要。针对现有方法在利用城市区域间空间关联性方面的不足,提出了一种基于动态时间规整(dynamic time warping,DTW)和时空注意力图卷积(spatio-temporal ...为了保障城市电网规划质量和做好电力电量平衡,准确的中长期电力负荷预测变得尤为重要。针对现有方法在利用城市区域间空间关联性方面的不足,提出了一种基于动态时间规整(dynamic time warping,DTW)和时空注意力图卷积(spatio-temporal attention graph convolution,ASTGCN)的预测方法。首先,通过深入分析目标城市各区域间的相关性,建立了耦合关系;其次,利用DTW算法构建邻接矩阵,捕捉城市各区域间的时空相关性;然后,应用ASTGCN模型预测各区域的负荷,以捕捉负荷的时空特征;最后,通过合并各区域的预测结果,得到整体的城市预测负荷。实验结果表明:所提方法能够更全面地捕捉城市中的时空关系,显著提高中长期负荷预测精度。展开更多
Due to the stochastic and correlated attributes of natural inflows, the mid-term generation scheduling problem for cascaded hydro systems is a very challenging issue.This paper proposes a novel stochastic optimization...Due to the stochastic and correlated attributes of natural inflows, the mid-term generation scheduling problem for cascaded hydro systems is a very challenging issue.This paper proposes a novel stochastic optimization algorithm using Latin hypercube sampling and Cholesky decomposition combined with scenario bundling and sensitivity analysis(LC-SB-SA) to address this problem.To deal with the uncertainty of natural inflows, Latin hypercube sampling is implemented to provide an adequate number of sampling scenarios efficiently, and Cholesky decomposition is introduced to describe the correlated natural inflows among cascaded stations.In addition, to overcome the difficulties in solving the objectives of all the scenarios, scenario bundling and sensitivity analysis algorithms are developed to improve the computational efficiency.Simulation results from both two-station and tenstation systems indicate that the proposed method has the merits in accuracy as well as calculation speed for the midterm cascaded hydro generation scheduling.The consideration of natural inflow correlation makes the formulated problem more realistic.展开更多
文摘The first mid-term election of the U. S. in the new century took place on November 5, 2002. One third of the senators from the 107th Congress (34 out of 100), all representatives (435), 36 state governors, and numerous local officials and legislators were to be elected or reelected. The resounding victory of the GOP in the congressional elections and the fact that the Democrats only got three more.
文摘Objective Transesophageal echocardiography (TEE) guided,minimally invasive perventricular device occlusion of ventricular septal defects (VSDs) without cardiopulmonary bypass (CPB) has been applied in multiple centers. We reported experiences and the mid-term results. Methods Four hundred and thirty-two cases from 4 cardiac centers were involved in the study. There were 235 maled and 197 females,aged from 3 months to 15 years,with a body weight varying from 4.0 to 26.0 kg.
文摘Objective To compare the clinical outcomes of Bryan disc replacement with anterior cervical discectomy and fusion (ACDF) in patients with cervical spondylopathy. Methods Sixteen patients underwent Bryan cervicaldisc replacement (A group) ,and
基金supported in part by National Natural Science Foundation of China (No.51507100)in part by Shanghai Sailing Program (No.15YF1404600)+1 种基金in part by ‘‘Chen Guang’’ project supported by Shanghai Municipal Education CommissionShanghai Education Development Foundation (No.14CG55)
文摘Due to the stochastic and correlated attributes of natural inflows, the mid-term generation scheduling problem for cascaded hydro systems is a very challenging issue.This paper proposes a novel stochastic optimization algorithm using Latin hypercube sampling and Cholesky decomposition combined with scenario bundling and sensitivity analysis(LC-SB-SA) to address this problem.To deal with the uncertainty of natural inflows, Latin hypercube sampling is implemented to provide an adequate number of sampling scenarios efficiently, and Cholesky decomposition is introduced to describe the correlated natural inflows among cascaded stations.In addition, to overcome the difficulties in solving the objectives of all the scenarios, scenario bundling and sensitivity analysis algorithms are developed to improve the computational efficiency.Simulation results from both two-station and tenstation systems indicate that the proposed method has the merits in accuracy as well as calculation speed for the midterm cascaded hydro generation scheduling.The consideration of natural inflow correlation makes the formulated problem more realistic.
