Lucent Technologies Inc.

Avaya Technology LLC

Yehuda Vardi

Jean Meloche

Lorraine Denby

David Y Lee

Akshay Adhikari

Balaji Sathyanarayana Rao

Colin Lingwood Mallows

Scott Vincent Bianco

Shane M Sullivan

Techniques are disclosed for improved monitoring and analysis of VoIP communications, multimedia communications or other types of network traffic in a network-based communication system. In accordance with one aspect of the invention, endpoint devices of the network-based communication system are configurable so as to collectively implement a distributed monitoring and analysis system which does not require a centralized testing server or other centralized controller. Distributed test units associated with the endpoint devices may be utilized in implementing the distributed monitoring and analysis system, and are preferably configured to support a web-based user interface providing access to measurement data. The endpoint devices may be advantageously organized into a hierarchy comprising a plurality of zones, with each of the endpoint devices belonging to at least one zone. For each zone, one of the endpoint devices may be designated as a zone leader for controlling the periodic generation of communications between selected endpoint devices that belong to subzones of that zone in the hierarchy.

Distributed monitoring and analysis system for network traffic

Discrete tomographic apparatus comprises an electron microscope for irradiating a sample comprising an atomic lattice structure. Line count data is obtained for the main directions of a cross section of the sample. A non-linear programming algorithm is applied to obtain probabilities of occupancy of lattice sites by atoms of the sample. The non-linear programming algorithm comprises an iterative application of the expectation/maximization algorithm upper bounded by the constraint that each variable is valued at less than or equal to one. Once the algorithm is iteratively applied a phantom image of the cross section of the sample is generated. The cross sectional area may be less than one thousand atoms by one thousand atoms.

Method and apparatus for discrete tomography

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Watchung, NJ, United States of America

Yehuda Vardi