Profile monitoring is used to check the stability of the quality of a product over time when the product quality is best represented by a function at each time point.However,most previous monitoring approaches have no...Profile monitoring is used to check the stability of the quality of a product over time when the product quality is best represented by a function at each time point.However,most previous monitoring approaches have not considered that the argument values may vary from profile to profile,which is common in practice.A novel nonparametric control scheme based on profile error is proposed for monitoring nonlinear profiles with varied argument values.The proposed scheme uses the metrics of profile error as the statistics to construct the control charts.More details about the design of this nonparametric scheme are also discussed.The monitoring performance of the combined control scheme is compared with that of alternative nonparametric methods via simulation.Simulation studies show that the combined scheme is effective in detecting parameter error and is sensitive to small shifts in the process.In addition,due to the properties of the charting statistics,the out-of-control signal can provide diagnostic information for the users.Finally,the implementation steps of the proposed monitoring scheme are given and applied for monitoring the blade manufacturing process.With the application in blade manufacturing of aircraft engines,the proposed nonparametric control scheme is effective,interpretable,and easy to apply.展开更多
目的通过DSA观察无症状大脑中动脉闭塞患者的侧支循环代偿状态。方法回顾性连续纳入2018年10月-2022年2月邢台市第九医院收治的经DSA确诊的无症状性大脑中动脉闭塞患者(无症状闭塞组),并选择同期经DSA检查确诊为症状性急性大脑中动脉闭...目的通过DSA观察无症状大脑中动脉闭塞患者的侧支循环代偿状态。方法回顾性连续纳入2018年10月-2022年2月邢台市第九医院收治的经DSA确诊的无症状性大脑中动脉闭塞患者(无症状闭塞组),并选择同期经DSA检查确诊为症状性急性大脑中动脉闭塞且进行了血管内治疗的患者作为对照组(症状性闭塞组)。收集患者的人口学信息、血管危险因素。对两组的DSA检查结果进行再评估,采用美国介入治疗神经放射学学会(American Society of Interventional and Therapeutic Neuroradiology,ASITN)/介入放射学学会(Society of Interventional Radiology,SIR)标准评估侧支循环状态。比较两组的ASITN/SIR评分差异。结果共纳入39例患者,无症状闭塞组17例,症状性闭塞组22例,症状性闭塞组高同型半胱氨酸血症病史发生率高于无症状闭塞组,两组其余基线资料差异无统计学意义。无症状闭塞组中ASITN/SIR评分2级2例(11.8%)、3级6例(35.3%)、4级9例(52.9%),症状性闭塞组中ASITN/SIR评分0级3例(13.6%)、1级8例(36.4%)、2级6例(27.3%)、3级3例(13.6%)、4级2例(9.1%),两组差异有统计学意义(P<0.001),无症状闭塞组的侧支循环代偿更优。结论无症状大脑中动脉闭塞患者比症状性大脑中动脉闭塞患者具有更好的侧支循环代偿。展开更多
基金supported by National Natural Science Foundation of China (Grant No. 70931004,Grant No. 70802043)
文摘Profile monitoring is used to check the stability of the quality of a product over time when the product quality is best represented by a function at each time point.However,most previous monitoring approaches have not considered that the argument values may vary from profile to profile,which is common in practice.A novel nonparametric control scheme based on profile error is proposed for monitoring nonlinear profiles with varied argument values.The proposed scheme uses the metrics of profile error as the statistics to construct the control charts.More details about the design of this nonparametric scheme are also discussed.The monitoring performance of the combined control scheme is compared with that of alternative nonparametric methods via simulation.Simulation studies show that the combined scheme is effective in detecting parameter error and is sensitive to small shifts in the process.In addition,due to the properties of the charting statistics,the out-of-control signal can provide diagnostic information for the users.Finally,the implementation steps of the proposed monitoring scheme are given and applied for monitoring the blade manufacturing process.With the application in blade manufacturing of aircraft engines,the proposed nonparametric control scheme is effective,interpretable,and easy to apply.
文摘目的通过DSA观察无症状大脑中动脉闭塞患者的侧支循环代偿状态。方法回顾性连续纳入2018年10月-2022年2月邢台市第九医院收治的经DSA确诊的无症状性大脑中动脉闭塞患者(无症状闭塞组),并选择同期经DSA检查确诊为症状性急性大脑中动脉闭塞且进行了血管内治疗的患者作为对照组(症状性闭塞组)。收集患者的人口学信息、血管危险因素。对两组的DSA检查结果进行再评估,采用美国介入治疗神经放射学学会(American Society of Interventional and Therapeutic Neuroradiology,ASITN)/介入放射学学会(Society of Interventional Radiology,SIR)标准评估侧支循环状态。比较两组的ASITN/SIR评分差异。结果共纳入39例患者,无症状闭塞组17例,症状性闭塞组22例,症状性闭塞组高同型半胱氨酸血症病史发生率高于无症状闭塞组,两组其余基线资料差异无统计学意义。无症状闭塞组中ASITN/SIR评分2级2例(11.8%)、3级6例(35.3%)、4级9例(52.9%),症状性闭塞组中ASITN/SIR评分0级3例(13.6%)、1级8例(36.4%)、2级6例(27.3%)、3级3例(13.6%)、4级2例(9.1%),两组差异有统计学意义(P<0.001),无症状闭塞组的侧支循环代偿更优。结论无症状大脑中动脉闭塞患者比症状性大脑中动脉闭塞患者具有更好的侧支循环代偿。