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An origin-destination (OD) flow between two routers is the set of packets that pass both routers in a network. Measuring the sizes of OD flows is important to many network management applications such as capacity planning, traffic engineering, anomaly detection, and network reliability analysis. Measurement efficiency and accuracy are two main technical challenges. In terms of efficiency, we want...
The spread of a source host is the number of distinct destinations that it has sent packets to during a measurement period. A spread estimator is a software/hardware module on a router that inspects the arrival packets and estimates the spread of each source. It has important applications in detecting port scans and distributed denial-of-service (DDoS) attacks, measuring the infection rate of a worm,...
This paper presents a novel method for estimating quantiles for pair wise distances. While the algorithm for computing pair wise distances for data is simple, the computation times as well as memory requirements grow quadratically with the size of the input dataset, making a naive implementation undesirable. In this paper, the performance of the proposed method is compared to the performances of a...
We have investigated a technique for recognising faces invariant of facial expressions. We apply multi-linear tensor algebra, which subsumes linear algebra, to analyse and recognise 3D face surfaces. This potent framework possesses a remarkable ability to deal with the shortcomings of principle component analysis in less constrained situations. A set of vector spaces can be used to represent the variation...
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