David J. Phillips

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" Privacy " is an ambiguous notion, encompassing personal autonomy, democratic participation, identity management, and social coordination. Each of these privacy ideals reflect different sets of social concerns. Laws operationalize privacy in terms of " personally identifiable information. " Technologies reify that definition. This has implications for the(More)
We describe the semidefinite analog of the vector packing problem, and show that the semidefinite programming relaxations for Maxcut [10] and graph coloring [16] are in this class of problems. We extend a method of Bienstock and Iyengar [4] which was based on ideas from Nesterov [24] to design an algorithm for computing-approximate solutions for this class(More)
In this paper we define semidefinite packing programs and describe an algorithm to approximately solve these problems. Semidefinite packing programs arise in many applications such as semidefinite programming relaxations for combinatorial optimization problems, sparse principal component analysis, and sparse variance unfolding technique for dimension(More)
Online surveillance interferes with the individual's ability to control their expressive identity – to determine the scope of the social context in which their activities are to be seen and interpreted. Entrepreneurs have responded to these concerns by offering pseudonymizers, which employ cryptographic techniques to allow users to create several unlinkable(More)
In this paper we describe an algorithm to approximately solve a class of semidefinite programs called covering semidefinite programs. This class includes many semidefinite programs that arise in the context of developing algorithms for important optimization problems such as Undirected SPARSEST CUT, wireless multicasting, and pattern classification. We give(More)
Graph theory is increasingly being used to study brain connectivity across the spectrum of Alzheimer's disease (AD), but prior findings have been inconsistent, likely reflecting methodological differences. We systematically investigated how methods of graph creation (i.e., type of correlation matrix and edge weighting) affect structural network properties(More)
Surveillance Studies needs Gender and Sexuality. That is why this issue came into being. Although this is a comparatively short issue of Surveillance and Society, perhaps representing the fact that the critique of surveillance through these lenses is still in its infancy, its contributions highlight some of the ways in which studies of gender and sexuality(More)