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    • 4. 发明申请
    • Physics-Based, Bayesian Sequential Detection Method and System for Radioactive Contraband
    • 基于物理的贝叶斯序列检测方法和放射性对照系统
    • US20100030721A1
    • 2010-02-04
    • US12259198
    • 2008-10-27
    • James V. CandyMichael C. AxelrodEric F. BreitfellerDavid H. ChambersBrian L. GuidryDouglas R. ManattAlan W. MeyerKenneth E. Sale
    • James V. CandyMichael C. AxelrodEric F. BreitfellerDavid H. ChambersBrian L. GuidryDouglas R. ManattAlan W. MeyerKenneth E. Sale
    • G06N5/02
    • G06N7/005
    • A distributed sequential method and system for detecting and identifying radioactive contraband from highly uncertain (noisy) low-count, radionuclide measurements, i.e. an event mode sequence (EMS), using a statistical approach based on Bayesian inference and physics-model-based signal processing based on the representation of a radionuclide as a monoenergetic decomposition of monoenergetic sources. For a given photon event of the EMS, the appropriate monoenergy processing channel is determined using a confidence interval condition-based discriminator for the energy amplitude and interarrival time. If accepted the parameter values of the photon event are used to update the parameter values using an LKF for the energy amplitude and a bootstrap PF for the interarrival times. These parameter estimates are then used to update a measured probability density function estimate for a target radionuclide. A a sequential likelihood ratio test, which is based in part on a previous sequential likelihood ratio for a previous photon event, the updated measured PDF estimates, and the an a-priori PDF estimates based on expected amplitude level and interarrival time values of the target radionuclide, is then used to determine one of two threshold conditions signifying that the EMS is either identified as the target radionuclide or as not the target radionuclide, and if not, then repeating the process with for the next sequential photon event of the EMS until one of the two threshold conditions is satisfied.
    • 使用基于贝叶斯推理和基于物理模型的信号处理的统计方法,从高度不确定(噪声)低计数,放射性核素测量(即事件模式序列(EMS))中检测和识别放射性违禁品的分布式顺序方法和系统 基于放射性核素作为单能源的单能分解的表示。 对于EMS的给定光子事件,使用基于置信区间条件的鉴别器确定适当的单能量处理信道用于能量幅度和间隔时间。 如果接受,光子事件的参数值用于使用用于能量幅度的LKF和用于间隔时间的引导PF来更新参数值。 然后使用这些参数估计来更新目标放射性核素的测量概率密度函数估计。 一种连续似然比测试,其部分地基于先前光子事件的先前顺序似然比,更新的测量的PDF估计和基于目标的预期振幅水平和差异时间值的先验PDF估计 放射性核素,然后用于确定两个阈值条件之一,表示EMS被识别为目标放射性核素,或者不是目标放射性核素,如果不是,则重复该过程用于EMS的下一个顺序光子事件直到一个 满足两个阈值条件。