64,909 research outputs found
URBANIZED SOCIETY NEEDS MET BY RURAL PEOPLE
Community/Rural/Urban Development,
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Off the record?: Arrestee concerns about the manipulation, modification, and misrepresentation of police body-worn camera footage
Police body-worn cameras (BWC) have become the latest technological device introduced to policing on a wave of panacean promises. Recent research has reported the perspectives of police officers, police management, and the general public, but there have been no studies examining the views of police arrestees. Remedying this significant omission, this article presents findings generated from interviews with 907 individuals shortly after their arrest. Overall, we report a strong in principle support for police body-worn cameras amongst this cohort, particularly if the cameras can be operated impartially. The findings are organised into a trilogy of prominent and interrelated concerns voiced by the police detainees, namely the potential for the manipulation, modification, and misrepresentation of events captured by police body-worn cameras. The findings are discussed in a broader context of the “new visibility” of police encounters and contribute much needed findings to understand the culturally specific ways in which different publics experience and respond to visual surveillance
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Elicitation and representation of expert knowledge for computer aided diagnosis in mammography
To study how professional radiologists describe, interpret and make decisions about micro-calcifications in mammograms. The purpose was to develop a model of the radiologists' decision making for use in CADMIUM II, a computerized aid for mammogram interpretation that combines symbolic reasoning with image processing
Exact Post Model Selection Inference for Marginal Screening
We develop a framework for post model selection inference, via marginal
screening, in linear regression. At the core of this framework is a result that
characterizes the exact distribution of linear functions of the response ,
conditional on the model being selected (``condition on selection" framework).
This allows us to construct valid confidence intervals and hypothesis tests for
regression coefficients that account for the selection procedure. In contrast
to recent work in high-dimensional statistics, our results are exact
(non-asymptotic) and require no eigenvalue-like assumptions on the design
matrix . Furthermore, the computational cost of marginal regression,
constructing confidence intervals and hypothesis testing is negligible compared
to the cost of linear regression, thus making our methods particularly suitable
for extremely large datasets. Although we focus on marginal screening to
illustrate the applicability of the condition on selection framework, this
framework is much more broadly applicable. We show how to apply the proposed
framework to several other selection procedures including orthogonal matching
pursuit, non-negative least squares, and marginal screening+Lasso
Constructing Reference Metrics on Multicube Representations of Arbitrary Manifolds
Reference metrics are used to define the differential structure on multicube
representations of manifolds, i.e., they provide a simple and practical way to
define what it means globally for tensor fields and their derivatives to be
continuous. This paper introduces a general procedure for constructing
reference metrics automatically on multicube representations of manifolds with
arbitrary topologies. The method is tested here by constructing reference
metrics for compact, orientable two-dimensional manifolds with genera between
zero and five. These metrics are shown to satisfy the Gauss-Bonnet identity
numerically to the level of truncation error (which converges toward zero as
the numerical resolution is increased). These reference metrics can be made
smoother and more uniform by evolving them with Ricci flow. This smoothing
procedure is tested on the two-dimensional reference metrics constructed here.
These smoothing evolutions (using volume-normalized Ricci flow with DeTurck
gauge fixing) are all shown to produce reference metrics with constant scalar
curvatures (at the level of numerical truncation error).Comment: 37 pages, 16 figures; additional introductory material added in
version accepted for publicatio
Interference Energy Spectrum of the Infinite Square Well
Certain superposition states of the 1-D infinite square well have transient
zeros at locations other than the nodes of the eigenstates that comprise them.
It is shown that if an infinite potential barrier is suddenly raised at some or
all of these zeros, the well can be split into multiple adjacent infinite
square wells without affecting the wavefunction. This effects a change of the
energy eigenbasis of the state to a basis that does not commute with the
original, and a subsequent measurement of the energy now reveals a completely
different spectrum, which we call the {interference energy spectrum} of the
state. This name is appropriate because the same splitting procedure applied at
the stationary nodes of any eigenstate does not change the measurable energy of
the state. Of particular interest, this procedure can result in measurable
energies that are greater than the energy of the highest mode in the original
superposition, raising questions about the conservation of energy akin to those
that have been raised in the study of superoscillations. An analytic derivation
is given for the interference spectrum of a given wavefunction with
known zeros located at points . Numerical simulations
were used to verify that a barrier can be rapidly raised at a zero of the
wavefunction without significantly affecting it. The interpretation of this
result with respect to the conservation of energy and the energy-time
uncertainty relation is discussed, and the idea of alternate energy eigenbases
is fleshed out. The question of whether or not a preferred discrete energy
spectrum is an inherent feature of a particle's quantum state is examined.Comment: 26 Pages, 5 Figure
Scalar, Vector and Tensor Harmonics on the Three-Sphere
Scalar, vector and tensor harmonics on the three-sphere were introduced
originally to facilitate the study of various problems in gravitational
physics. These harmonics are defined as eigenfunctions of the covariant Laplace
operator which satisfy certain divergence and trace identities, and
ortho-normality conditions. This paper provides a summary of these properties,
along with a new notation that simplifies and clarifies some of the key
expressions. Practical methods are described for accurately and efficiently
computing these harmonics numerically, and test results are given that
illustrate how well the analytical identities are satisfied by the harmonics
computed numerically in this way.Comment: 14 pages, 9 figures, to appear in General Relativity and Gravitatio
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