3,138 research outputs found
Locally Adaptive Nonparametric Binary Regression
A nonparametric and locally adaptive Bayesian estimator is proposed for
estimating a binary regression. Flexibility is obtained by modeling the binary
regression as a mixture of probit regressions with the argument of each probit
regression having a thin plate spline prior with its own smoothing parameter
and with the mixture weights depending on the covariates. The estimator is
compared to a single spline estimator and to a recently proposed locally
adaptive estimator. The methodology is illustrated by applying it to both
simulated and real examples.Comment: 31 pages, 10 figure
Death and the internet: consumer issues for planning and managing digital legacies
The team of Melbourne University researchers examined licencing policies, terms of use agreements and copyright law, and interviewed a range of people, including funeral directors, religious workers, internet content and service providers, as well as estate planning lawyers.
The project identified a range of ownership and access issues, and found that many online \u27assets\u27 are left exposed or stranded after death. The researchers concluded that more Australians should include digital registers in, or with, their wills and these should contain passwords and account locations so that material can then be distributed by the Executor or other designated person.
A website was also created as part of the project and provides useful tips and information on preparing a digital register. Visit it here: www.digitalheritage.net.a
Ethernet - a survey on its fields of application
During the last decades, Ethernet progressively became the most widely used local area networking (LAN) technology. Apart from LAN installations, Ethernet became also attractive for many other fields of application, ranging from industry to avionics, telecommunication, and multimedia. The expanded application of this technology is mainly due to its significant assets like reduced cost, backward-compatibility, flexibility, and expandability. However, this new trend raises some problems concerning the services of the protocol and the requirements for each application. Therefore, specific adaptations prove essential to integrate this communication technology in each field of application. Our primary objective is to show how Ethernet has been enhanced to comply with the specific requirements of several application fields, particularly in transport, embedded and multimedia contexts. The paper first describes the common Ethernet LAN technology and highlights its main features. It reviews the most important specific Ethernet versions with respect to each application fieldâs requirements. Finally, we compare these different fields of application and we particularly focus on the fundamental concepts and the quality of service capabilities of each proposal
Phosphorus donors in highly strained silicon
The hyperfine interaction of phosphorus donors in fully strained Si thin
films grown on virtual SiGe substrates with is
determined via electrically detected magnetic resonance. For highly strained
epilayers, hyperfine interactions as low as 0.8 mT are observed, significantly
below the limit predicted by valley repopulation. Within a Green's function
approach, density functional theory (DFT) shows that the additional reduction
is caused by the volume increase of the unit cell and a local relaxation of the
Si ligands of the P donor.Comment: 12 pages, 3 figure
Improving empathy of physicians through guided reflective writing
Objectives: This study was designed to explore how guided reflective writing could evoke empathy and reflection in a group of practicing physicians.
Methods: Total participants recruited included 40 staff physicians at Cleveland Clinic, a tertiary care academic medical center. Twenty physicians (intervention group) were assigned to participate in a 6-session faculty development program introducing narrative medicine and engaging in guided reflective writing. Ten physicians (comparison group 1) received the assigned course reading materials but did not participate in the course sessions. Ten physicians (comparison group 2) neither received the reading materials nor participated in the sessions. Qualitative analysis of the physicians\u27 reflective writings was performed to identify major themes. The Jefferson Scale of Empathy was administered three times during the course.
Results: Qualitative analysis of physicians\u27 writings showed themes of both compassionate solidarity and detached concern. Exploration of negative emotions occurred more frequently than positive ones. The most common writing style was case presentation. A total of 36 staff physicians completed the Jefferson Scale of Empathy. Results of statistical analysis suggested an improvement in empathy in the intervention group at the end of the course (p \u3c 0 .05).
Conclusions: These results suggest a faculty development program using guided narrative writing can promote reflection and may enhance empathy among practicing physicians. These findings should encourage medical educators to design additional strategies for enhancing reflection and empathic behavior in trainees and specifically practicing physicians who can role model these behaviors to achieve the ultimate goal of improving the quality of patient care
Degenerate ground states and nonunique potentials: breakdown and restoration of density functionals
The Hohenberg-Kohn (HK) theorem is one of the most fundamental theorems of
quantum mechanics, and constitutes the basis for the very successful
density-functional approach to inhomogeneous interacting many-particle systems.
Here we show that in formulations of density-functional theory (DFT) that
employ more than one density variable, applied to systems with a degenerate
ground state, there is a subtle loophole in the HK theorem, as all mappings
between densities, wave functions and potentials can break down. Two weaker
theorems which we prove here, the joint-degeneracy theorem and the
internal-energy theorem, restore the internal, total and exchange-correlation
energy functionals to the extent needed in applications of DFT to atomic,
molecular and solid-state physics and quantum chemistry. The joint-degeneracy
theorem constrains the nature of possible degeneracies in general many-body
systems
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Pre-clinical development of a lentiviral vector expressing the anti-sickling beta AS3 globin for gene therapy for sickle-cell disease
Wavepacket basis for time-dependent processes and its application to relaxation in resonant electronic transport
Stroboscopic wavepacket basis sets [P. Bokes, F. Corsetti, R. W. Godby, Phys.
Rev. Lett. 101, 046402 (2008)] are specifically tailored for a description of
time-dependent processes in extended systems like non-periodic geometries of
various contacts consisting of solids and molecules. The explanation of the
construction of such a basis for two simple finite systems is followed by a
review of the general theory for extended systems with continuous spectrum. The
latter is further elaborated with the introduction of the interaction
representation which takes the full advantage of the time-dynamics built into
the basis. The formalism is applied to a semi-analytical example of electronic
transport through resonant tunnelling barrier in 1D. Through the time-dependent
generalisation of the Landauer formula given in terms of the Fourier expansion
of the transmission amplitude we analyze the temporal character of the onset of
the steady-state. Various time-scales in this process are shown to be directly
related to the energetic structure of the resonant barrier
Low energy excitations of double quantum dots in the lowest Landau level regime
We study the spectrum and magnetic properties of double quantum dots in the
lowest Landau level for different values of the hopping and Zeeman parameters
by means of exact diagonalization techniques in systems of N=6 and N=7
electrons and filling factor close to 2. We compare our results with those
obtained in double quantum layers and single quantum dots. The Kohn theorem is
also discussed.Comment: 23 pages, 4 figures, 1 table; references added; journal versio
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