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    • 72. 发明授权
    • Method and apparatus for predicting future travel times over a transportation network
    • 用于预测运输网络未来旅行时间的方法和装置
    • US07363144B2
    • 2008-04-22
    • US11052309
    • 2005-02-07
    • Zhen LiuLaura WynterLi Zhang
    • Zhen LiuLaura WynterLi Zhang
    • G06F19/00
    • G08G1/123
    • The present invention is a method and an apparatus for predicting future travel times over a transportation network. In one embodiment, a method for predicting future travel times over a transportation network includes receiving a data point indicating a real-time volume of traffic on the link at a given time and updating a template representative of an observed traffic pattern on the link in accordance with the received data point. A future travel time over the link can then be estimated in accordance with the updated template. Thus, the template is able to adapt to dynamically changing traffic patterns, taking these changing traffic patterns into account when making predictions of future traffic patterns.
    • 本发明是用于预测运输网络上的未来旅行时间的方法和装置。 在一个实施例中,用于预测运输网络上的未来旅行时间的方法包括在给定时间接收指示链路上的实时流量的数据点,并且根据链路更新表示链路上观察到的业务模式的模板 与收到的数据点。 然后可以根据更新的模板来估计链接上的未来旅行时间。 因此,模板能够适应动态变化的流量模式,在对未来流量模式进行预测时考虑到这些变化的流量模式。
    • 78. 发明授权
    • Method and apparatus for predicting future travel times over a transportation network
    • 用于预测运输网络未来旅行时间的方法和装置
    • US07920960B2
    • 2011-04-05
    • US12038559
    • 2008-02-27
    • Zhen LiuLaura WynterLi Zhang
    • Zhen LiuLaura WynterLi Zhang
    • G06F19/00
    • G08G1/123
    • The present invention is a method and an apparatus for predicting future travel times over a transportation network. In one embodiment, a method for predicting future travel times over a transportation network includes receiving a data point indicating a real-time volume of traffic on the link at a given time and updating a template representative of an observed traffic pattern on the link in accordance with the received data point. A future travel time over the link can then be estimated in accordance with the updated template. Thus, the template is able to adapt to dynamically changing traffic patterns, taking these changing traffic patterns into account when making predictions of future traffic patterns.
    • 本发明是用于预测运输网络上的未来旅行时间的方法和装置。 在一个实施例中,用于预测运输网络上的未来旅行时间的方法包括在给定时间接收指示链路上的实时流量的数据点,并且根据链路更新表示链路上观察到的业务模式的模板 与收到的数据点。 然后可以根据更新的模板来估计链接上的未来旅行时间。 因此,模板能够适应动态变化的流量模式,在对未来流量模式进行预测时考虑到这些变化的流量模式。
    • 80. 发明授权
    • Clock synchronization for network measurements with clock resets
    • 具有时钟复位的网络测量的时钟同步
    • US07194649B2
    • 2007-03-20
    • US10157610
    • 2002-05-29
    • Zhen LiuCathy Honghui XiaLi Zhang
    • Zhen LiuCathy Honghui XiaLi Zhang
    • G06F1/12
    • G06F1/10
    • Several algorithms are provided to estimate and remove relative clock skews from delay measurements based on the computation of convex hulls. The algorithms are linear in the number of measurement points for the case with no clock resets. For the more challenging case with clock resets, i.e., the clocks are reset to some reference times during the measurement period, linear algorithms are provided to identify the clock resets and derive the best clock skew lines. The algorithms are also extended to environments in which at least one of the clocks is controlled by Network Time Protocol. These algorithms can also be extended for active clock synchronization to replace or further improve Network Time Protocol.
    • 提供了几种算法来估计和消除基于凸包计算的延迟测量的相对时钟偏差。 对于没有时钟复位的情况,算法在测量点的数量上是线性的。 对于具有时钟复位的更具挑战性的情况,即在测量周期期间将时钟重置为某些参考时间,提供线性算法以识别时钟复位并导出最佳时钟偏斜线。 这些算法还扩展到其中至少一个时钟由网络时间协议控制的环境。 这些算法也可以被扩展以用于主动时钟同步来替代或进一步改进网络时间协议。