Abstract: Techniques for internet last-mile outage detection are disclosed herein. The techniques include methods for monitoring, by a network appliance associated with a network, a plurality of network nodes, detecting, by the network appliance, that a network node of the plurality of network nodes in a last mile of the network has disconnected from the network, overlaying, by the network appliance, the network node over a network model for at least a portion of the network including the network node to generate a model overlay, and determining, by the network appliance, a last mile outage source associated with a disconnection of the network node by identifying a lowest common ancestor node of the network node from the model overlay. Systems and computer-readable media are also provided.

Abstract: Techniques for internet last-mile outage detection are disclosed herein. The techniques include methods for monitoring, by a network appliance associated with a network, a plurality of network nodes, detecting, by the network appliance, that a network node of the plurality of network nodes in a last mile of the network has disconnected from the network, overlaying, by the network appliance, the network node over a network model for at least a portion of the network including the network node to generate a model overlay, and determining, by the network appliance, a last mile outage source associated with a disconnection of the network node by identifying a lowest common ancestor node of the network node from the model overlay. Systems and computer-readable media are also provided.

Abstract: The Doppler angle is adjusted to a value close to the optimum Doppler angle DAopt, typically amounting to 60.degree., between the direction of an echographic excitation and the axis of a blood vessel in an echographic image, based on prior designation of an initial point in the vessel. The method includes a first measurement of the Doppler angle DA1 in a first, predetermined excitation direction, comparison of DA1 with Daopt, formation of .DELTA..theta.=.vertline.DAopt-DA1.vertline., and correction of the direction of the echographic excitation by the value .DELTA..theta. in order to shift it to a second direction.

Abstract: Automatic measurement is made of the angle DA enclosed by the direction of ultrasonic echographic excitation and the axis of a vessel in an echographic image on the basis of prior designation of an initial point P.sub.i in the vessel. A first isotropic tracing of rays starting from the initial point P.sub.i is used to produce a histogram of the grey levels of the points of the rays. An algorithm is then applied to the histogram in order to classify the grey levels of selected points. A second tracing of rays is made which is restricted to the walls of the vessel and results in a local mark with triangular sectors from which the slope (a) of a regression line is determined and the calculation of the Doppler angle DA is made as DA=Arc tg(a).

Abstract: An echograph includes a transmission stage (20), a circuit (31) for suppressing fixed echos, and a correlation-interpolation circuit (33).The the transmission stage (20) transmits a pulsed signal having two neighboring, alternating recurrent periods T.sub.1 and T.sub.2, the fixed echo suppression circuit (31) being adapted to double the recurrent period and comprises two outputs having the index even and odd, the correlation-interpolation circuit (33) performing, for each velocity, two distinct correlations, one of which is associated with the period T.sub.1 whereas the other is associated with the period T.sub.2, after which these two correlations are compared so as to derive a non-ambiguous velocity value therefrom.