Abstract.
We consider the problem of estimating hybrid frequency moments of two dimensional data
streams. In this model, data is viewed to be organized in a matrix form (Ai;j)1i;j;n. The entries
Ai;j are updated coordinate-wise, in arbitrary order and possibly multiple times. The updates include
both increments and decrements to the current value of Ai;j . The hybrid frequency moment Fp;q(A)
is dened as
Pn
j=1
....etc

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Abstract.
The problem of estimating the kth frequency moment Fk, for any
non-negative integral value of k, over a data stream by looking at the items exactly
once as they arrive, was considered in a seminal paper by Alon, Matias and
Szegedy . They present a sampling based algorithm to estimate Fk where,
k  2, using space ˜O(n1−1/k)). Coppersmith and Kumar and , using
different methods, present algorithms for estimating Fk with space complexity
˜O
(n1−1/(k−1)). In this paper, we present an algorithm for es ....etc

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Abstract
The problem of estimating the kth frequency moment Fk over a data stream by looking at the items exactly once as they arrive was posed in . A succession of algorithms have been proposed for this problem . Recently, Indyk and Woodru® have presented the ¯rst algorithm for estimating Fk, for k > 2, using space ~O (n1¡2=k), matching the space lower bound (up to poly-logarithmic factors) for this problem (n is the number of distinct items occurring in the stream.) In this paper, we pre ....etc

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Airspace Encounter Model for Estimating Collision Risk
Seminar Report
Submitted in partial fulfillment of the
requirements for the award of M.Tech Degree in
Electrical Engineering
(Guidance & Navigational Control)
of the University of Kerala
Presented By
Ms Anumol A
st
1 Semester, M.Tech, Roll No:10GNC02
Guided by
Smt S. Sreeja
Le ....etc

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Abstract.
We consider updates to an n-dimensional frequency vector of a data stream, that is, the vector f is updated coordinate-wise by means of insertions or deletions in any arbitrary order. A fundamental problem in this model is to recall the vector approximately, that is to return an estimate ^ f of f such that j ^ fi ....etc

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Abstract.
Space-economical estimation of the pth frequency moments, defined as Fp = Pn i=1|fi|p, for p > 0, are of interest in estimating all-pairs distances in a large data matrix , machine learning, and in data stream computation. Random sketches formed by the inner product of the frequency vector f1, . . . , fn with a suitably chosen random vector were pioneered by Alon, Matias and Szegedy , and have since played a central role in estimating Fp and for data stream computations in general. The concept of p-stable sketches for ....etc

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Abstract.
We present a randomized procedure named Hierarchical Sampling from Sketches (HSS) that can be used for estimating a class of functions over the frequency vector f of update streams of the form (S) = Pn i=1 (|fi|).We illustrate this by applying the HSS technique to design nearly space-optimal algorithms for estimating the pth moment of the frequency vector, for real p _ 2 and for estimating the entropy of a data stream. 3
1 Introduction
A variety of applications in diverse areas, such as, networking, database sys ....etc

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ABSTRACT
We present an approach to estimate the poses of human headsin natural scenes. The essential features for estimating the headpose are the positions of the prominent facial features relativeto the position of the head. We have developed a highdimensional,randomly sparse representation of a human faceusing a simpli£ed facial feature model. The representationtransforms a raw face image into a vector representing howwell the image matches large number of randomly-posed andshaped head models. This transformation is designed to coll ....etc

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Abstract.
We present an algorithm for estimating entropy of data streams consisting of insertion and deletion operations using ~O(1) space.
1 1 Introduction
Recently, there has been an emergence of monitoring applications in diverse areas, including, network traf_c monitoring, network topology monitoring, sensor networks, _nancial market monitoring, web-log monitoring, etc.. In these applications, data is generated rapidly and continuously, and must be analyzed very ef_ciently, in realtime, to identify large trends, anomalies ....etc

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Analytical methods for estimating the wind-induced response of structures

Giovanni Solari 1)
1) DISEG/UGE, Department of Structural and Geotechnical Engineering, University of Genoa
Via Montallegro 1, 16145 Genoa, Italy


INTRODUCTION
Estimating the wind-induced response of structures and, in particular, the maximum response and the equivalent static force is a main topic in the panorama of the research developed in wind engineering over the last 40 years. Analyses are usually carried out through theor ....etc

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