CPHD(Cardinalized Probability Hypothesis Density)滤波是一种杂波环境下可变目标数的多目标跟踪算法,该文针对算法中存在的目标漏检问题提出一种改进算法,该算法在高斯混合框架下实现贝叶斯递归,通过对各个高斯分量进行标记,对目标...CPHD(Cardinalized Probability Hypothesis Density)滤波是一种杂波环境下可变目标数的多目标跟踪算法,该文针对算法中存在的目标漏检问题提出一种改进算法,该算法在高斯混合框架下实现贝叶斯递归,通过对各个高斯分量进行标记,对目标进行航迹关联,在此基础上对修剪合并后各个高斯分量的权值进行两次分配。首先对超过检测门限的高斯分量权值进行分配,有效解决了目标漏检问题,然后基于一个目标只可能产生一个观测的事实进行第2次分配,改善了目标发生交叉时的算法性能。实验结果表明,所提方法在多目标状态估计和航迹维持方面均优于普通的CPHD算法。展开更多
目的对1例ABw亚型患者进行A型血浆置换后血型血清学变化以及是否发生溶血反应进行回顾性调查。方法使用微柱凝胶技术、微柱玻璃珠技术、盐水试管法、吸收放散等血型血清学方法及分子生物学方式进行ABO血型鉴定和基因分型,对患者血浆置...目的对1例ABw亚型患者进行A型血浆置换后血型血清学变化以及是否发生溶血反应进行回顾性调查。方法使用微柱凝胶技术、微柱玻璃珠技术、盐水试管法、吸收放散等血型血清学方法及分子生物学方式进行ABO血型鉴定和基因分型,对患者血浆置换前后实验室检查结果进行分析。结果该患者于行2000 mL A型血浆置换后转入本院,d 2检测正反定型相符;d 3检测反定B细胞凝集强度为±~1+,正反定型不符。经试管法、人源抗-B吸收放散试验确认存在B抗原,分子生物学鉴定为ABw03型。患者用A型血浆进行血浆置换后,血红蛋白、血小板计数均一过性下降,肌酐一过性轻度上升,谷丙转氨酶、谷草转氨酶持续下降,总胆红素和间接胆红素一过性下降后上升,提示存在轻微的溶血性输血反应。结论ABO亚型患者含弱A或B抗原,输注大量血浆可能引起溶血性输血反应。应严格按照ABO血型正反定型标准判断血型结果,对弱凝集采取额外实验室检查并结合分子生物学技术进行正确的判断和处理,可以减少ABO亚型的漏检,减少输血反应的发生。展开更多
The Least Squares Residual(LSR)algorithm is commonly used in the Receiver Autonomous Integrity Monitoring(RAIM).However,LSR algorithm presents high Missed Detection Risk(MDR)caused by a large-slope faulty satellite an...The Least Squares Residual(LSR)algorithm is commonly used in the Receiver Autonomous Integrity Monitoring(RAIM).However,LSR algorithm presents high Missed Detection Risk(MDR)caused by a large-slope faulty satellite and high False Alert Risk(FAR)caused by a small-slope faulty satellite.In this paper,the LSR algorithm is improved to reduce the MDR for a large-slope faulty satellite and the FAR for a small-slope faulty satellite.Based on the analysis of the vertical critical slope,the optimal decentralized factor is defined and the optimal test statistic is conceived,which can minimize the FAR with the premise that the MDR does not exceed its allowable value of all three directions.To construct a new test statistic approximating to the optimal test statistic,the Optimal Decentralized Factor weighted LSR(ODF-LSR)algorithm is proposed.The new test statistic maintains the sum of pseudo-range residual squares,but the specific pseudo-range residual is weighted with a parameter related to the optimal decentralized factor.The new test statistic has the same decentralized parameter with the optimal test statistic when single faulty satellite exists,and the difference between the expectation of the new test statistic and the optimal test statistic is the minimum when no faulty satellite exists.The performance of the ODFLSR algorithm is demonstrated by simulation experiments.展开更多
文摘CPHD(Cardinalized Probability Hypothesis Density)滤波是一种杂波环境下可变目标数的多目标跟踪算法,该文针对算法中存在的目标漏检问题提出一种改进算法,该算法在高斯混合框架下实现贝叶斯递归,通过对各个高斯分量进行标记,对目标进行航迹关联,在此基础上对修剪合并后各个高斯分量的权值进行两次分配。首先对超过检测门限的高斯分量权值进行分配,有效解决了目标漏检问题,然后基于一个目标只可能产生一个观测的事实进行第2次分配,改善了目标发生交叉时的算法性能。实验结果表明,所提方法在多目标状态估计和航迹维持方面均优于普通的CPHD算法。
文摘目的对1例ABw亚型患者进行A型血浆置换后血型血清学变化以及是否发生溶血反应进行回顾性调查。方法使用微柱凝胶技术、微柱玻璃珠技术、盐水试管法、吸收放散等血型血清学方法及分子生物学方式进行ABO血型鉴定和基因分型,对患者血浆置换前后实验室检查结果进行分析。结果该患者于行2000 mL A型血浆置换后转入本院,d 2检测正反定型相符;d 3检测反定B细胞凝集强度为±~1+,正反定型不符。经试管法、人源抗-B吸收放散试验确认存在B抗原,分子生物学鉴定为ABw03型。患者用A型血浆进行血浆置换后,血红蛋白、血小板计数均一过性下降,肌酐一过性轻度上升,谷丙转氨酶、谷草转氨酶持续下降,总胆红素和间接胆红素一过性下降后上升,提示存在轻微的溶血性输血反应。结论ABO亚型患者含弱A或B抗原,输注大量血浆可能引起溶血性输血反应。应严格按照ABO血型正反定型标准判断血型结果,对弱凝集采取额外实验室检查并结合分子生物学技术进行正确的判断和处理,可以减少ABO亚型的漏检,减少输血反应的发生。
文摘The Least Squares Residual(LSR)algorithm is commonly used in the Receiver Autonomous Integrity Monitoring(RAIM).However,LSR algorithm presents high Missed Detection Risk(MDR)caused by a large-slope faulty satellite and high False Alert Risk(FAR)caused by a small-slope faulty satellite.In this paper,the LSR algorithm is improved to reduce the MDR for a large-slope faulty satellite and the FAR for a small-slope faulty satellite.Based on the analysis of the vertical critical slope,the optimal decentralized factor is defined and the optimal test statistic is conceived,which can minimize the FAR with the premise that the MDR does not exceed its allowable value of all three directions.To construct a new test statistic approximating to the optimal test statistic,the Optimal Decentralized Factor weighted LSR(ODF-LSR)algorithm is proposed.The new test statistic maintains the sum of pseudo-range residual squares,but the specific pseudo-range residual is weighted with a parameter related to the optimal decentralized factor.The new test statistic has the same decentralized parameter with the optimal test statistic when single faulty satellite exists,and the difference between the expectation of the new test statistic and the optimal test statistic is the minimum when no faulty satellite exists.The performance of the ODFLSR algorithm is demonstrated by simulation experiments.
