Ms. Lisa D. Amini Profile

Lisa D. Amini

at IBM Thomas J Watson Research Ctr

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Proceedings Article | 1 July 2002 Paper

Issues with inferring Internet topological attributes

Lisa Amini, Anees Shaikh, Henning Schulzrinne

Proceedings Volume 4865, (2002) https://doi.org/10.1117/12.473379

KEYWORDS: Internet, Glasses, Databases, Data modeling, Data transmission, Analytical research, Pathology, Control systems, Windows 2000, Mathematical modeling

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A number of recent studies are based on data collected from routing tables of inter-domain routers utilizing Border Gateway Protocol (BGP) and tools, such as traceroute, to probe end-to-end paths. The goal is to infer Internet topological properties. However, as more data is collected, it becomes obvious that data intended to represent the same properties, if gathered at different points within the network, can depict significantly different characteristics. While systematic data collection from a number of network vantage points can reduce certain ambiguities, thus far, no methods have been reported for fully resolving these issues. The goal of our study was to quantify the effect these anomalies have on key Internet structural attributes. We report on our analysis of over 290,000 measurements from globally distributed sites. We contrast results obtained from router-level measurements with those obtained from BGP routing tables, and offer insights as to why certain inferred properties differ. We demonstrate that the effect on some attributes, such as the average path length and the AS degree distribution can be minimized through careful data collection techniques. We also illustrate how using this same data to model other attributes, such as the actual forwarding path between a pair of nodes, or the level of AS path asymmetry, can produce substantially misleading results.

Proceedings Article | 27 December 1999 Paper

MediaMesh: an architecture for integrating isochronous processing algorithms into media servers

Lisa Amini, Jorge Lepre, Martin Kienzle

Proceedings Volume 3969, (1999) https://doi.org/10.1117/12.373525

KEYWORDS: Video, Computer programming, Multimedia, Control systems, Video processing, Visualization, Switches, Optical filters, Digital watermarking, Network architectures

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Current media servers do not provide the generality required to easily integrate arbitrary isochronous processing algorithms into streams of continuous media. Specifically, present day video server architectures primarily focus on disk and network strategies for efficiently managing available resources under stringent QoS guarantees. However, they do not fully consider the problems of integrating the wide variety of algorithms required for interactive multimedia applications. Examples of applications benefiting from a more flexible server environment include watermarking, encrypting or scrambling streams, visual VCR operations, and multiplexing or demultiplexing of live presentations. In this paper, we detail the MediaMesh architecture for integrating arbitrary isochronous processing algorithms into general purpose media servers. Our framework features a programming model through which user-written modules can be dynamically loaded and interconnected in self-managing graphs of stream processing components. Design highlights include novel techniques for distributed stream control, efficient buffer management and QoS management. To demonstrate its applicability, we have implemented the MediaMesh architecture in the context of a commercial video server. We illustrate the viability of the architecture through performance data collected from four processing modules that were implemented to facilitate new classes of applications on our video server.

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