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Connecting ICTs to development: The IDRC experience
Book ReviewAlthough the editors speciªcally deny that this book is a historical account, it only narrowly escapes that label. The book does attempt to consolidate some 15 years of International Development Research Centre (IDRC)–sponsored action research on ICT intervention projects undertaken in three main global regions, Latin America and the Caribbean, Africa and Asia. This “Herculean” (the editors’ words) effort does give the book the semblance of an epic, engrossing, all-encompassing exposition of the key concerns, actors, and events relevant to the IDRC’s ICT4D community. The book reports on the work of an IDRC-created thematic grouping identified as “Information and Communications Technologies for Development” (ICT4D), an acronym which has since gained widespread appeal in the academic research community (Heeks, 2006)
Upper Limits from Counting Experiments with Multiple Pipelines
In counting experiments, one can set an upper limit on the rate of a Poisson
process based on a count of the number of events observed due to the process.
In some experiments, one makes several counts of the number of events, using
different instruments, different event detection algorithms, or observations
over multiple time intervals. We demonstrate how to generalize the classical
frequentist upper limit calculation to the case where multiple counts of events
are made over one or more time intervals using several (not necessarily
independent) procedures. We show how different choices of the rank ordering of
possible outcomes in the space of counts correspond to applying different
levels of significance to the various measurements. We propose an ordering that
is matched to the sensitivity of the different measurement procedures and show
that in typical cases it gives stronger upper limits than other choices. As an
example, we show how this method can be applied to searches for
gravitational-wave bursts, where multiple burst-detection algorithms analyse
the same data set, and demonstrate how a single combined upper limit can be set
on the gravitational-wave burst rate.Comment: 26 pages (CQG style), 8 figures. Added study of robustness of limits
Advantage of a quantum player over a classical one in 2x2 quantum games
We study a general symmetric, entangled, quantum game. When one
player has access only to classical strategies while the other can use the full
range of quantum strategies, there are ``miracle'' moves available to the
quantum player that can direct the result of the game towards the quantum
player's preferred result regardless of the classical player's strategy. The
advantage pertaining to the quantum player is dependent on the degree of
entanglement. Below a critical level, dependent on the payoffs in the game, the
miracle move is of no advantage.Comment: Revtex, 10 pages, 2 tables, 4 figures; v2 typo corrected in table 2,
cosmetic changes to tables and figures, comment added to section VI E; v3
title changed to published title; minor mathematical errors in published
version correcte
An introduction to quantum game theory
The application of the methods of quantum mechanics to game theory provides
us with the ability to achieve results not otherwise possible. Both linear
superpositions of actions and entanglement between the players' moves can be
exploited. We provide an introduction to quantum game theory and review the
current status of the subject.Comment: 8 pages, RevTeX; v2 minor changes to the text in light of referees
comments, references added/update
A comparison between matter wave and light wave interferometers for the detection of gravitational waves
We calculate and compare the response of light wave interferometers and
matter wave interferometers to gravitational waves. We find that metric matter
wave interferometers will not challenge kilometric light wave interferometers
such as Virgo or LIGO, but could be a good candidate for the detection of very
low frequency gravitational waves
Vetoes for Inspiral Triggers in LIGO Data
Presented is a summary of studies by the LIGO Scientific Collaboration's
Inspiral Analysis Group on the development of possible vetoes to be used in
evaluation of data from the first two LIGO science data runs. Numerous
environmental monitor signals and interferometer control channels have been
analyzed in order to characterize the interferometers' performance. The results
of studies on selected data segments are provided in this paper. The vetoes
used in the compact binary inspiral analyses of LIGO's S1 and S2 science data
runs are presented and discussed.Comment: Submitted to Classical and Quantum Gravity for the GWDAW-8
proceeding
The distribution of cirripeds and gastropods on plain vertical rock surfaces in the upper intertidal and splash zones
This is a student paper done for a University of California Berkeley Zoology class. Since UCB didn't have its own marine lab at the time, it rented space at Hopkins Marine Station where this work was done. Cadet Hand earned his Ph.D. from Berkeley and went on to become Director of the Bodega Marine Laboratory. Donald Putnam Abbott also earned his Ph.D. from Berkeley and later became a Stanford professor at Hopkins Marine Station. (PDF contains 26 pages
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